Automatic liquid feed conveying method for pig breeding

Abstract

The present application relates to a method for automatically delivering liquid feed for pig breeding, which comprises the following steps: Step 1: delivering the liquid feed under a system standard pressure of 2-5 Pa; Step 2: the liquid feed is delivered through the inner wall of a PVC pipe with 2 spiral ribs. The method for automatically delivering liquid feed for pig breeding is characterized in that a double spiral pipe is arranged, the liquid feed is delivered under a system standard pressure of 3-5 Pa, and the inner wall of the PVC pipe is provided with 2 spiral ribs, so that the feed is rotated and mixed while flowing forward. The double spiral pipe is produced by an integral mold extrusion process, the height of the ribs is 12.6±0.3 mm, and the coil gradient of the spiral ribs is designed as 0.75 turns / m. In the fluid mechanics simulation test, the best mixing effect can be achieved, and the pipeline resistance is not too high, so that the system delivery distance is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field, in particular to a method for automatic delivery of liquid feed for pig breeding. BACKGROUND

[0002] With the development of pig breeding technology in China, automatic feeding equipment is constantly improving. In recent years, more and more breeding enterprises choose liquid feed automatic delivery and feeding system. These breeding enterprises mix full-price dry feed, silage feed, fermented feed and other solid or semi-solid feed components with water in advance in the liquid feed operating room, then deliver the mixed liquid feed to each discharge port position in the pig house through the automatic feeding system, and then use the automatic feeding valve to feed the feed into the designated trough. Compared with the traditional dry feed feeding method, liquid feed has the advantages of reasonable nutritional composition, cost economy, good palatability of livestock, and the functions of improving the health status of pig herd, increasing the feed conversion rate, and increasing the weaning weight of piglets. It is a more advanced automatic feeding system for pig farms.

[0003] The computer-controlled liquid feed feeding system was invented in Germany in the 1980s. After nearly 30 years of development, it has gradually matured and been widely used in Europe. China began to introduce computer-controlled liquid feed feeding systems at the end of the last century. However, due to the complexity of the system, the high level of operation and maintenance, the system has not been effectively promoted. In the past two years, with the continuous improvement of pig breeding level in China and the increasingly fierce competition among breeding enterprises, in order to achieve energy saving and environmental protection, cost reduction and efficiency improvement, more and more pig breeding enterprises have begun to try to use liquid feed mixing and feeding technology to feed pigs. This technology can use other nutrients (such as corn silage, pumpkin vines, etc.) as part of the feed substitute to feed pigs, and can accurately adjust the nutritional ratio according to the physical condition of the pigs, minimizing feed waste and nutritional deficiencies and excesses. At the same time, reasonable liquid feed can reduce the content of nitrogen, phosphorus and other substances in pig farm manure, reducing the environmental pressure on breeding enterprises. The system equipment has broad development prospects, and more breeding enterprises will adopt liquid feed feeding systems in the future.

[0004] In the prior art, due to the characteristics of liquid feed conveying, the mixed liquid feed will separate when transported by PVC pipeline for a long distance, and the feed with different specific gravity will be layered, in this case, the feeding valve close to the liquid feed operating room will have a high content of solid substances and substances with large specific gravity (such as starch, minerals, etc.), and the feeding valve far away will have a high content of water and substances with small specific gravity (such as bran, fiber, etc.), which will cause the growth state and health condition of the pig population in different pig houses in the system to be uneven; in the current liquid feed conveying system, the mixed liquid feed is conveyed to the specified discharge valve by a screw pump or a centrifugal pump through a 63mm PVC pipeline with smooth inner wall and PN10-PN16 pressure resistance, which can meet the demand of liquid feed conveying, but in the case of long-distance conveying, the feed will be layered and the different components of the feed will be layered, therefore, it is necessary to propose an automatic liquid feed conveying method for pig breeding to solve the above problems. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides an automatic liquid feed conveying method for pig breeding, which has a PVC feeding pipe with double helical inner ribs, which can mix various components uniformly at a long conveying distance, and can ensure that the feed components discharged at the far end and the near end of the system are basically the same, so that the pig population in different pig houses can grow healthily and have balanced and consistent body conditions.

[0006] To achieve the above object, the present application provides the following technical scheme: an automatic liquid feed conveying method for pig breeding, the method for automatic liquid feed conveying for pig breeding comprises the following steps,

[0007] Step 1: In use, the liquid feed is conveyed by the double helical pipe under the system standard pressure of 2-5 Pa.

[0008] Step 2: The liquid feed is conveyed by rotating and mixing while flowing forward by increasing 2 spiral ribs on the inner wall of the PVC pipe with a wall thickness of 3.0mm.

[0009] Further, the pipe diameter of the spiral pipe (A) includes 50mm or 63mm, wherein the pipe diameter of the spiral pipe (A) is 50mm, and the height of the rib is 9-10mm; or the pipe diameter of the spiral pipe (A) is 63mm, and the height of the rib is 11-13mm.

[0010] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0011] 1. The method for automatic delivery of liquid feed for pig breeding, by setting double spiral pipe, the stratification phenomenon generated by the liquid feed under the pressure of system standard pressure 3-5 Pa when delivering at a long distance, by increasing 2 spiral ribs on the inner wall of the PVC pipe with wall thickness 3.0 mm, the feed is mixed while flowing forward. The double spiral pipe is produced by integral mold extrusion process, the height of the rib is 12.6±0.3 mm, the coil gradient of the spiral rib is designed as 0.75 turns / m, the best mixing effect can be achieved in the fluid mechanics simulation test, at the same time, the pipeline resistance is not too high, the system delivery distance is guaranteed, when the double spiral liquid feed is delivered, the feed in the double spiral pipe is continuously mixed due to the double spiral inner rib structure while pumping, the purpose of balanced feed composition is achieved, even if the delivery distance is long, the various components are uniformly mixed, the feed components delivered at the far end and the near end of the system are basically the same, so that the pig population in different pig houses can grow healthily, the physical condition is balanced and consistent, the use of this double spiral feeding pipe can obtain balanced feed quality at the feed discharge port near or far from the feed operation room in the liquid feed delivery system, so that the pig population in the whole field has the same body type and balanced health condition, reduces the difficulty of pig farm management and pig sale of breeding enterprises, reduces the enterprise cost, and improves the economic benefit.

[0012] 2. The method for automatic delivery of liquid feed for pig breeding, by setting spiral rib, the double spiral inner rib structure also improves the strength of the pipe, under the same working condition, the pipe wall thickness can be reduced to 81% of the ordinary PVC pipe; the pressure resistance of the pipeline can be increased by more than twice, which can effectively avoid the risk of pipeline explosion when the system pressure abnormally rises (such as pipeline blockage); higher pipeline strength and pressure level can reduce the risk of equipment failure and reduce maintenance workload, thereby reducing the equipment maintenance cost of breeding enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a perspective view of the double spiral pipe structure of the application;

[0014] Figure 2 It is a perspective view of the ordinary PVC pipe structure of the application;

[0015] Figure 3 It is a variety of flow material data table graph of the application;

[0016] Figure 4 It is a flow analysis structure schematic diagram of the liquid feed in the double spiral pipe of the application;

[0017] Figure 5 It is a flow analysis structure schematic diagram of the rapeseed in the double spiral pipe of the application;

[0018] Figure 6 It is a flow analysis structure schematic diagram of the pea in the double spiral pipe of the application;

[0019] Figure 7 The schematic diagram of the particle trajectory structure of the oilseed rape and the pea in the double spiral pipe according to the present application;

[0020] Figure 8 The schematic diagram of the comparison of the sedimentation characteristics of the common PVC pipe and the double spiral pipe according to the present application;

[0021] Figure 9 The table of the conclusion of the test results according to the present application;

[0022] Figure 10 The schematic diagram of the pressure resistance test of the double spiral pipe according to the present application.

[0023] In the figure: A, double spiral pipe; B, spiral rib; C, common PVC pipe. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application.

[0025] Please refer to Figures 1-10 The method for automatically conveying liquid feed for pig breeding in the embodiments, the method for automatically conveying liquid feed for pig breeding comprises the following steps,

[0026] Step one: in use, the liquid feed is conveyed through the double spiral pipe A under the pressure of the system standard pressure 2-5 Pa.

[0027] Step two: the liquid feed is conveyed by the way of adding 2 spiral ribs B on the inner wall of the PVC pipe with the wall thickness of 3.0 mm, so that the liquid feed is rotated and mixed while flowing forward.

[0028] In practice, by setting up a double helix tube, the stratification phenomenon that occurs when liquid feed is transported over long distances under the standard system pressure of 3-5 Pa is mitigated by adding two helical ribs to the inner wall of a 3.0 mm thick PVC pipe, so that the feed is rotated and mixed while flowing forward. The double-helix tube is produced using an integral die extrusion process. The rib height is 12.6±0.3mm, and the coil gradient of the helical ribs is designed to be 0.75 turns / meter. In fluid dynamics simulation tests, it can achieve the best mixing effect without generating excessive pipe resistance, ensuring the system's conveying distance. When conveying liquid feed in the double-helix tube, the feed inside the tube will continuously rotate and mix due to the double-helix internal rib structure while being pumped, achieving the purpose of balanced feed composition. Even at long conveying distances, the various components are mixed evenly, ensuring that the feed composition at the far end and near end of the system is basically the same. This allows pigs in different pig houses to grow healthily and maintain a consistent body condition. Using this double-helix feeding tube, the liquid feed conveying system can obtain feed of consistent quality regardless of whether the feeding port is near or far from the feed handling room. This results in pigs with the same body type and consistent health status throughout the farm, reducing the difficulty of pig farm management and pig sales for breeding enterprises, lowering enterprise costs, and improving economic efficiency.

[0029] By setting spiral ribs B, the double spiral inner rib structure also improves the strength of the pipe. Under the same operating conditions, the pipe wall thickness can be reduced to 81% of that of ordinary PVC pipes. The pressure resistance of the pipe can be increased by more than two times, which can effectively avoid the risk of pipe bursting when the system pressure rises abnormally (such as pipe blockage). The higher pipe strength and pressure bearing level can reduce the risk of equipment failure, reduce the workload of maintenance, and thus reduce the equipment maintenance cost of aquaculture enterprises.

[0030] Figure 3 The values ​​in the table represent the different values ​​for peas, rapeseed, and liquid feed. The liquid feed has a density of 1080 kg / m3, a dynamic viscosity of 0.275 Pas, and a volumetric flow rate of 8000 I / h during transportation. The grain densities of rapeseed and peas are 1086 kg / m3 and 1363 kg / m3, respectively, and the particle diameters are 0.7, 1.5, 3.0 mm and 0.7, 1.5, 3.0 mm, respectively.

[0031] And from Figure 4 , Figure 5 , Figure 6 As can be seen, the particle trajectories and flow velocities of peas and rapeseed in the double helix tube are different. During the double helix tube conveying process, the flow velocity is high in the middle and low at the edges. During the conveying process through the double helix tube, the particles can rotate and mix while flowing forward, which can ensure the uniform mixing of various conveyed components. In the fluid dynamics simulation test, the best mixing effect can be achieved.

[0032] fromFigure 7 It can be seen from the particle distribution of the Y elevation coordinate of the rapeseed and the pea after 4m and 6m in the common PVC pipe and the double spiral pipe that they are different, and the particle distribution of the Y elevation coordinate of the rapeseed and the pea after 4m and 6m in the common PVC pipe and the double spiral pipe is shown in Figs. 6 and 7. Figure 4 、 Figure 5 、 Figure 6 and Figure 7 From the test of the liquid feed, the rapeseed and the pea in the common PVC pipe and the double spiral pipe in

[0033] The unit length pressure loss in the common PVC pipe is 1365Pa / m, the average particle elevation coordinate at the pipe outlet position is-8.970mm(pea=3.0mm), and the longitudinal coordinate X of the vortex force at the pipe outlet position is-0.0083 / s.

[0034] The unit length pressure loss in the double spiral pipe is 3021Pa / m, the average particle elevation coordinate at the pipe outlet position is-0.164mm(pea=3.0mm), and the longitudinal coordinate X of the vortex force at the pipe outlet position is 12549 / s.

[0035] The longitudinal coordinate vortex force of the pipe is a measurement standard of the rotating force applied to the flowing liquid, and the vortex force is completely related to the particle distribution: the greater the vortex force, the stronger the effect of the particles being lifted(carried), and it can be seen from the above data that the particle carrying effect in the double spiral pipe is stronger, and the uniform mixing characteristic of the particles during the conveying process can be maintained, the water and the feed are effectively prevented from being layered, and the different components of the feed are effectively prevented from being layered, so that the components of the feed discharged at the far end and the near end of the system are basically the same, and the pig groups in different pig houses can grow healthily and have balanced and consistent physical conditions.

[0036] It can be seen from Figure 10 that the double spiral pipe can withstand the burst pressure of 3.281MPa, the inner rib structure of the double spiral pipe can also improve the strength of the pipe, and under the same working conditions, the thickness of the pipe wall can be reduced to 81% of that of the common PVC pipe; the pressure resistance of the pipe can be increased by more than twice, which can effectively avoid the risk of pipe burst of the pipe when the system pressure abnormally rises(such as pipe blockage); the higher pipe strength and pressure level can reduce the risk of equipment failure and the workload of maintenance, thereby reducing the equipment maintenance cost of the breeding enterprise.

[0037] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and implementations, it is to be understood that the terminology used is for the purpose of descriptive clarity and that it should be taken in a descriptive sense and not a limiting sense.

[0038] While the embodiments of the application have been shown and described herein, it is to be understood that the application is not limited to these embodiments. Rather, many modifications, changes, substitutions, and alterations can be made to the embodiments of the application without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. An automatic method for conveying liquid feed in pig farming, characterized in that, The method for automated delivery of liquid feed in pig farming includes the following steps. Step 1: When using the system, liquid feed is transported through a double helix tube (A) under a standard system pressure of 2-5 Pa. Step 2: The liquid feed will be transported by adding two spiral ribs (B) to the inner wall of a 3.0mm thick PVC pipe, so that the liquid feed will be rotated and mixed while flowing forward. The double helix tube (A) is a double helix with a helix degree / meter = 0.75U / m. The double helix tube (A) has symmetrically distributed threads, parallel cross-sections, and a rectangular top. An ordinary PVC pipe (C) is installed outside the helical rib (B). The ordinary PVC pipe (C) is a single helix with a helix degree / meter = 0.95U / m. The ordinary PVC pipe (C) has an asymmetrical thread layout, a slightly inclined cross-section, and a relatively large slope. The double helix tube (A) is produced by integral die extrusion process. The height of the two helical ribs (B) is 12.6±0.3mm, and the coil gradient of the helical ribs (B) is designed to be 0.75 turns / meter.

2. The automatic conveying method for liquid feed in pig farming according to claim 1, characterized in that: The double helix tube (A) is made of PVC-U recyclable material and has a volume of 3102711 mm². 3 Main dimensions: outer diameter of the ribbed end 62mm+0.2-0.4mm; outer diameter of the unribbed end 63.3mm+0.2-0.4mm; rib height 12.6±0.3mm; inner chamfer R1; nominal pipe diameter DN63mm; burst pressure: ≥1Mpa.

3. The automatic conveying method for liquid feed in pig farming according to claim 1, characterized in that: The double helix tube (A) has two diameters: 50 mm and 63 mm. The double helix tube (A) consists of a 4 m long tube, a 1 m long extension tube, and a 2 m long double helix tube (A) assembly.

4. The automatic conveying method for liquid feed in pig farming according to claim 1, characterized in that: The helixity of the double helix (A): 0.75 turns / meter, spiral height 8.5mm, spiral length 2m, compressive strength rating: PN10-PN16.

5. The automatic conveying method for liquid feed in pig farming according to claim 1, characterized in that: Both the double-helix pipe (A) and the ordinary PVC pipe (C) passed the rapeseed and pea sedimentation tests. characteristic.

6. The automatic conveying method for liquid feed in pig farming according to claim 1, characterized in that: The rapeseed inside the ordinary PVC pipe (C) is 0.7mm thick, and the average Y-elevation coordinate distribution after 4m is -0.203mm. The rapeseed inside the ordinary PVC pipe (C) is 0.7mm thick, and the average Y-elevation coordinate distribution after 5m is -0.207mm.

7. The automatic conveying method for liquid feed in pig farming according to claim 1, characterized in that: The average Y-coordinate distribution of the pea-sized material inside the ordinary PVC pipe (C) is -7.788 mm after 4 m, and the average Y-coordinate distribution of the pea-sized material inside the ordinary PVC pipe (C) is -8.970 mm after 5 m.

8. The automatic conveying method for liquid feed in pig farming according to claim 1, characterized in that: The average particle size of the peas inside the double helix tube (A) is 3.0 mm, and the average particle size distribution at the Y-coordinate after 6 m is -0.164 mm.

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