Investigation of the rotation number of a fish feed distribution device disc apparatus

. In fish farms established in Uzbekistan, granulated feeds are widely used for feeding fish, but they are distributed mainly by hand. In countries where fisheries are well developed, automatic, semi-automatic, and mechanical feed distribution devices are used to distribute food to fish in lakes where fish are grown, and it gives good results. Taking this into account, it is important to develop a device that distributes food for fish in Uzbekistan and to base its construction scheme on the technological work process. The influence of the number of rotations of the fish feed distribution device disk on the unevenness of the feed distribution and the distribution distance was studied. Based on this, a device for distributing granular feed to fish was developed and the number of revolutions of its feed distribution disc was investigated. When the rotation number of the feed distribution disc was changed from 750 r/min to 1750 r/min, the distribution radius of the feed increased and the unevenness decreased, and when the rotation number of the disc was 1500 r/min, the distribution radius of the feed was 9.6 m and the distribution unevenness was more than 20% it was determined not to be.


Introduction
Great opportunities are being given to the development of fisheries in Uzbekistan.On the basis of studying the experiences of countries with developed fisheries, cooperation with them is being expanded.In fish farms established in Uzbekistan, granulated feed is widely used for feeding fish [1].This has its own advantages, as the granules do not dissolve quickly when they reach the surface of the water, in this case, water pollution is avoided due to the fact that the fish have time to eat them completely, and it does not have a negative effect on the oxygenation of the water [2].
Automatic, semi-automatic, and mechanical feeding devices are used to distribute food to fish in lakes where fish are grown in countries with well-developed fisheries.This, in turn, is having a good effect [3].Taking this into account, it is important to develop a device that distributes food for fish in Uzbekistan and to base its construction scheme on the technological work process.In addition, it is important to pay attention to the processes of interaction of the working parts with the granules and to ensure the improvement of the quality of work during their movement [4,5].
Today, one of the urgent problems is the development of the structural scheme of the feed distribution parts and the justification of technological processes in devices that distribute fish feed to lakes [6,7].One of the important tasks is to justify the parameters and work modes that ensure the quality of work in the processes of impact of working parts with granule grains [8,9].
Based on this, as a result of the extensive development of fisheries in Uzbekistan, it is urgent to develop high-efficiency devices that distribute food to fish in order to prevent manual labor in feeding fish and justify its working regimes.

Materials and methods
In the research process, statistical analysis methods, theoretical mechanics and mathematical analysis, laws and rules of mathematical statistics, justification of device parameters based on one-factor experiments and methods specified in existing regulatory documents (GOST 34748-2021, GOST 24057-88, GOST 26025) were used [4,10].
The reliability of the research results is based on the fact that the research was carried out using effective methods and measuring tools, the theoretical justification of the parameters of the device that distributes granules on the water surface with less unevenness is based on the basic laws and rules of higher mathematics and theoretical mechanics, the mutual adequacy of theoretical and experimental research, the positive results of farm tests of the device for distributing food to fish explained by the results and implementation.
The study of the effect of the number of rotations of the disc of the granulated feed distribution device on the unevenness of the distribution of nutrients was carried out in laboratory conditions at the base of the Tashkent State Agrarian University, Uzbekistan.An experimental copy of the feed distribution device was prepared for conducting experiments (Figure 1).Experimental copy of the feed distribution device consists of hopper (1), auger (2), electric drive (3), disc (4), electric motor (5), star (6), roller (7), chain drive (8), arrow (9), handle (10), electric panel (11), puller (12), ladder-ballast (13), wheel (14), pillar (15), and supportive framework (16) (Figure 2).

Results and discussion
It is important to check the results of the theoretical research on the device for distributing granular feed into the water body in fisheries and the devices that distribute the granules.Experimental studies were carried out in this article to determine the parameters of the main operating parameters and the rational values of the operating modes of these devices.
In the experiments, the influence of the number of rotations of the fish feed distribution device disk on the unevenness of the feed distribution and the distribution distance was studied.In order to study the effect of the number of revolutions of the feed distribution disc on the unevenness of the feed distribution and the distribution distance, experiments were conducted by changing the number of rotations of the feed distribution disc from 500 r/min to 2000 r/min every 250 r/min.But in the experiments, the rotation speed of the feed distribution disc is 500 r/min, because the distribution surface of the feed is too small and the granules start to be crushed at 2000 r/min, so the experimental results were obtained in the range of the rotation number of the feed distribution disc from 750 r/min to 1750 r/min.During the study of the number of revolutions of the device feed distribution disk, the diameter of the disk was 200 mm, the number of blades was 4, the installation angle of the blades was 15 o , and the height of the blades was 20 mm.
In the conducted experiments, it was observed that as the number of revolutions of the feed distribution disc increases, the distribution surface of granular feed expands, which affects the quality of feed distribution.
In the experiments, when the number of rotations of the feed distribution disc was increased from 750 r/min to 1750 r/min in 250 r/min intervals, the feed throwing distance changed from 5.4 m to 10.8 m.If we analyze for each changed number of rotations of the feed distribution disc, when the number of rotations of the feed distribution disc is 750 r/min, on average, 12.7 g of feed fell into the Box 1 along the rows, followed by the Box 2 -13.2 g, Box 3 -14.1 g, Box 4 -13.5 g, Box 5 -12.9 g, Box 6 -11.5 g, Box 7 -9.6 g, Box 8 -9.1 g, and Box 9 -8.5 g of feed (Figure 3). 1) 750 r/min; 2) 1000 r/min; 3) 1250 r/min; 4) 1500 r/min; 5) 1750 r/min.According to the established requirements, it was taken into account that the distribution radius of the nutrients in the longitudinal direction should be at least 8 m, the distribution unevenness should not be more than 20%, and for this, the nutrients falling into each box (0.25 m 2 ) should be in the range of 8-12 g.In this case, when the number of revolutions of the feed distribution disc was 750 r/min, the distributed feed reached a maximum of 5.4 m.It was found that it was not distributed to the specified distance, and that the feed in boxes 1 to 5 was more than 12 g (12.7 -14.1 g), exceeding the specified norm.In this number of rotations of the feed disc, only bins 6-9 received the required amount of feed (between 8.4 and 11.5 g).
When the number of revolutions of the feed distribution disc is 1000 r/min, the feed distribution radius is 6.6 m, the feed in 3-5 boxes is more than 12 g (12.9-13.1 g), and the feed in 11 boxes is more than 8 g. was less (7.6 g) and did not meet the specified requirements.
In boxes 1, 2 and 7-10, it was found that 8.4 -11.5 g of food or the specified amount of food was received.
When the number of revolutions of the feed distribution disc was 1250 r/min, the distribution radius of the feed was 8.4 m, and it was found that the feed reached the specified distance.However, the amount of food in boxes 3 and 4 was more than 12 g (12.5-12.7 g).
The quality of the distribution of nutrients was further improved when the number of revolutions of the feed distribution disc was 1500 r/min.In this case, the distribution radius of feed was 9.6 m, feed was received in 16 boxes, and the amount of feed in all boxes was in the range of 8.8 -11.8 g, not less than 8 g and not more than 12 g.When the number of rotations of the feed distribution disc was 1750 r/min, the distribution radius of the feed increased and was 10.8 m, and the feed was received in 18 boxes.However, the amount of feed in boxes 16-18 was in the range of 7.1-7.8g and was less than 8 g.It was found that when the number of revolutions of the feed distribution disc is 1750 r/min, the distribution radius of the feed is large, but the amount of feed falling to its peripheral parts remains less than the specified one and does not satisfy the requirements.
According to the results of the above experiments, when the number of revolutions of the feed distribution disk is 1500 r/min, the distribution unevenness of the feed does not exceed the specified standard and fully meets the requirements.Therefore, it is desirable that the number of revolutions of the disk of the fish feeding device should be 1500 r/min.

Conclusions
When the number of revolutions of the feed distribution disc was changed from 750 r/min to 1750 r/min, the distribution radius of the feeds increased with the increase of the number of disc revolutions.In addition, the distribution flow unevenness decreased, and when the disc rotation number was 1500 r/min, the feed distribution radius was 9.6 m, and the amount of feed falling into all boxes was between 8.8 -11.8 g, and the distribution unevenness was not more than 20%.

Figure 1 .
Figure 1.Experimental device of fish feed distribution device.

Figure 2 .
Figure 2. Scheme of the device for distributing food to fish.

Figure 3 .
Figure 3. Dependence of feed dispersion unevenness on the number of disk rotations.