Mud pipe extrusion device and fish scale-shaped farmland irrigation composite pipe extrusion method thereof

Abstract

The mud pipe extrusion device comprises a conical extrusion bin, an auger installed in the conical extrusion bin, an extrusion pipe coaxially arranged at the tip end of the conical extrusion bin, and a closing-in type discharging nozzle which is integrally in a circular ring shape and arranged at the outer end opening of the extrusion pipe. An upper bending part which is bent towards the center of the extrusion pipe is arranged at the upper part of the closing-in type discharge nozzle; side bending parts which are bent towards the center of the extrusion pipe are arranged on the two sides of the extrusion pipe; through the closing-in bending structure of the closing-in type discharging nozzle, the extrusion-molded composite pipe can be bent downwards in a small range, the outer side face of the composite pipe is continuously scraped, under the combined action of downward bending force and scraping force, fish scale bodies are continuously formed on the outer side face of the composite pipe, and the fish scale-shaped composite pipe is formed. Irrigation water can rapidly permeate into the water seepage openings between the fish scale bodies after entering the composite pipe and rapidly flow out of the water seepage openings, the problem that the water seepage speed is low through straw gaps is solved, and the water seepage irrigation efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of straw returning to the field and agricultural irrigation, and particularly relates to a mud pipe extrusion device and a method for extruding a composite pipe for fish-scale farmland irrigation. Background Art

[0002] The invention patent with the authorization announcement number CN114041404B discloses a method for returning straw to the field by crushing corn straw and mixing it with soil and humidifying and extruding it into a composite pipe for underground irrigation. The composite pipe buried in the ground surface is used for farmland irrigation. After the epidermis and roots of the corn straw are crushed, the formed harder stalk debris and the soil on the pipe wall are not tightly combined. Therefore, a small gap will be generated between the stalk debris and the soil. During the process of irrigation water entering from one end of the composite pipe and flowing to the other end, it will continuously seep out from the gap at the stalk debris on the side wall of the composite pipe. The composite pipe forms an underground seepage pipe, and the seeped irrigation water is absorbed and diffused by the soil and enters the plant root layer. The problem existing in the above composite pipe during irrigation is that water, soil, and straw are mixed in a cyclone manner in the conical mixing bin of the conical extrusion device and then enter the conical extrusion bin. The compression auger inside the extrusion bin squeezes the mixture into the forming extrusion pipe, and under the action of the pipe forming column, a composite pipe of straw and soil is formed. However, during the process of the composite pipe being extruded from the forming extrusion pipe, it will be subjected to a large radial extrusion pressure, resulting in the stalk debris of the straw and the soil being relatively densely combined, causing the seepage gap formed between the stalk debris and the soil to be relatively narrow, resulting in a slower seepage speed of the irrigation water from the gap after entering the pipe and a lower irrigation efficiency, which needs to be improved. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a mud pipe extrusion device and a method for extruding a composite pipe for fish-scale farmland irrigation.

[0004] The technical solution of the present invention is: a mud pipe extrusion device, including a conical extrusion bin, an auger installed in the conical extrusion bin, an extrusion pipe coaxially arranged at the tip of the conical extrusion bin, and a forming column extending into the extrusion pipe and arranged at the outer end of the main shaft of the auger. A sprocket is provided at the end of the main shaft, and the main shaft is driven to rotate through a chain drive mechanism. A cyclone feeding hopper is provided at the upper part of the conical extrusion bin, and an overall circular ring-shaped closed-mouth discharging nozzle is provided at the outer port of the extrusion pipe. The upper part of the closed-mouth discharging nozzle is provided with an upper bending part that bends towards the center of the extrusion pipe.

[0005] Preferably, both sides of the closed-mouth discharging nozzle are provided with side bending parts that bend towards the center of the extrusion pipe, and the two side bending parts are symmetrically arranged.

[0006] Preferably, the bending amplitude of the upper bending part is greater than that of the side bending part, and a smooth transition is provided between the upper bending part and the side bending part.

[0007] Preferably, the width of the upper part of the converging discharge nozzle is greater than that of the lower part.

[0008] Preferably, the generatrix of the arc section at the lower part of the converging discharge nozzle coincides with the generatrix of the extrusion tube.

[0009] Preferably, an arc-shaped material guiding plate arranged obliquely downward is connected to the outer end of the extrusion tube. An arc-shaped transition support plate is arranged between the arc-shaped material guiding plate and the outer end of the extrusion tube. The transition support plate is welded and fixed at the end of the extrusion tube. The arc-shaped material guiding plate is hung on the outer end of the transition support plate through a hook, and the transition support plate is coaxially arranged with the extrusion tube.

[0010] An extrusion method for a composite pipe for farmland irrigation in a fish scale shape, including the above-mentioned mud pipe extrusion device, comprises the following steps: Step 1: The auger rotates to push the wet soil and straw mixture in the conical extrusion bin to be compressed and enter the extrusion tube. Step 2: The mixture is compressed and compacted in the extrusion tube, and forms a composite pipe under the action of the central forming column and is extruded from the converging discharge nozzle. Step 3: While extruding, the converging and bending structures inward on the upper part and both sides of the converging discharge nozzle can slightly bend the composite pipe downward, and continuously scrape the outer side of the composite pipe. Under the combined action of the downward bending force and the scraping force, the outer side of the composite pipe is continuously bent and scraped to form fish scales. The water seepage openings between the fish scales extend into the pipe wall of the composite pipe. Step 4: After the fish scale-shaped composite pipe is extruded, the transition support plate provides a short-term horizontal support for it, and then it enters the arc-shaped material guiding plate downward and is conveyed into the cultivated land through the arc-shaped material guiding plate for burial.

[0011] The beneficial technical effects of the present invention are: The extrusion device of the present invention is provided with a converging discharge nozzle at the outer end of the extrusion tube. Through its converging and bending structure, the extruded and formed composite pipe is slightly bent downward, and the outer side of the composite pipe is continuously scraped. Under the combined action of the downward bending force and the scraping force, the bonding strength between the soil and the straw inside the composite pipe is overcome and fish scales are continuously formed, forming a fish scale-shaped composite pipe. After irrigation water enters this composite pipe, it can quickly seep into the water seepage openings between the fish scales and flow out quickly from the water seepage openings, making up for the problem of slow water seepage speed relying on the gaps between the straws, effectively improving the water seepage irrigation efficiency, and being conducive to further promotion and application in the market. Description of the Drawings

[0012] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is Figure 1 the sectional structural schematic diagram in the A-A direction of Figure 3It is a three-dimensional structural schematic diagram of an extrusion pipe; Figure 4 It is a front view structural schematic diagram of an extrusion pipe; Figure 5 It is a three-dimensional structural schematic diagram of a composite pipe; Figure 6 It is Figure 5 A B-B cross-sectional structural schematic diagram of; Figure 7 It is the physical object of the present invention Figure 1 ; Figure 8 It is the physical object of the present invention Figure 2 .

[0013] In the figure, 11. Conical extrusion bin, 12. Auger, 13. Extrusion pipe, 14. Forming column, 2. Closed-mouth discharge nozzle, 21. Upper bending part, 22. Side bending part, 23. Lower arc section, 31. Arc-shaped guide plate, 32. Transition support plate, 4. Composite pipe, 41. Scale body, 42. Water seepage opening. Specific implementation mode

[0014] Example 1, see the appendix Figures 1-4 , A mud pipe extrusion device, including a conical extrusion bin 11, an auger 12 installed in the conical extrusion bin, an extrusion pipe 13 coaxially arranged at the tip of the conical extrusion bin, and a forming column 14 extending into the extrusion pipe 13 arranged at the outer end of the main shaft of the auger 12. The outer port of the extrusion pipe 13 is provided with a closed-mouth discharge nozzle 2 integrally in a circular ring shape. The upper part of the closed-mouth discharge nozzle 2 is provided with an upper bending part 21 bent towards the center of the extrusion pipe 13, and both sides are provided with side bending parts 22 bent towards the center of the extrusion pipe 13. When the composite pipe 4 is extruded from the extrusion pipe 13, the upper bending part 21 can slightly press and bend the composite pipe 4 downwards. At the same time, the upper bending part 21 and the two side bending parts 22 can scrape the outer side surface of the composite pipe 4, improving the friction force on the outer side surface when the composite pipe 4 is extruded. Under the combined action of the downward pressing and bending force and the scraping force, the bonding strength between the soil and straw inside the composite pipe 4 is overcome and the scale body 41 is continuously formed, forming a scale-shaped composite pipe 4.

[0015] The bending amplitude of the upper bending part 21 is greater than that of the side bending part 22, forming a bending difference between the upper bending part and the side bending part. Therefore, the scraping force of the upper bending part 21 is greater than the scraping forces on both sides, which is more conducive to forming the scale body 41 on the outer side surface of the composite pipe 4.

[0016] The width of the upper part of the closed-mouth discharge nozzle 2 is greater than the width of the lower part. The width difference between the upper and lower parts can reduce the supporting force of the lower part of the discharge nozzle on the composite pipe 4 and improve the downward pressing and scraping force of the upper bending part 21 on the composite pipe 4.

[0017] Combined with the difference in the bending amplitudes of the upper bending part 21 and the lower bending part, a fish-scale body 41 with sufficient water seepage openings 42 can be formed.

[0018] The generatrix of the arc section 23 at the lower part of the closed-mouth discharge nozzle 2 coincides with the generatrix of the extrusion pipe 13. This design can avoid generating scraping force at the bottom of the composite pipe 4, ensure the integrity of its bottom structure, enable the composite pipe 4 to have sufficient structural strength and flexibility, and avoid the phenomenon of pipe body fracture during the basic transportation process.

[0019] An arc-shaped guide plate 31 arranged obliquely downward is connected to the outer end of the extrusion pipe 13. The composite pipe 4 is slidably transported through the arc-shaped guide plate 31. Its opening structure can avoid squeezing the fish-scale body 41 generated on the composite pipe 4 and avoid affecting the water seepage effect. An arc-shaped transition support plate 32 is arranged between the outer end of the arc-shaped guide plate 31 and the extrusion pipe 13, and the transition support plate 32 is coaxially arranged with the extrusion pipe 13.

[0020] Example Two, see the appendix Figures 1-6 , an extrusion method for a fish-scale-shaped composite pipe for farmland irrigation, including the mud pipe extrusion device in Example One. The method steps are as follows: Step One: The auger 12 rotates to push the wet soil and straw mixed material in the conical extrusion bin 11 to be compressed and enter the extrusion pipe 13. Step Two: The mixed material is compressed and compacted in the extrusion pipe 13, and under the action of the central forming column 14, a composite pipe 4 is formed and extruded from the closed-mouth discharge nozzle 2. Step Three: While extruding, the upper part and both sides of the closed-mouth discharge nozzle 2 with inward closing and bending structures can slightly bend the composite pipe 4 downward and continuously scrape the outer side surface of the composite pipe 4. Under the combined action of the bending force and the scraping force, the outer side surface of the composite pipe 4 is continuously bent and scraped to form fish-scale bodies 41, and the water seepage openings 42 between the fish-scale bodies 41 extend into the pipe wall of the composite pipe 4; enabling the irrigation water to quickly seep into the water seepage openings 42 on the pipe wall after entering the composite pipe 4 and flow out quickly from the water seepage openings 42, which can make up for the problem of slow water seepage speed relying on the gaps between straws and effectively improve the water seepage irrigation efficiency.

[0021] Step Four: After the fish-scale-shaped composite pipe 4 is extruded, the transition support plate 32 provides a short-term horizontal support for it to avoid the composite pipe 4 from being subjected to excessive stress when exiting the extrusion pipe 13 and causing it to break, and then it enters the arc-shaped guide plate 31 downward.

Claims

1. A mud pipe extrusion device, comprising a conical extrusion chamber, an auger installed in the conical extrusion chamber, an extrusion pipe coaxially arranged at the tip of the conical extrusion chamber, and a forming column arranged at the outer end of the main shaft of the auger and extending into the extrusion pipe, wherein: The outer end of the extrusion tube is provided with a closed-end discharge nozzle which is in an overall annular shape, and the upper part of the closed-end discharge nozzle is provided with an upper bending part which is bent toward the center of the extrusion tube.

2. A mud pipe extrusion device according to claim 1, characterized in that: Both sides of the closed-end discharge nozzle are provided with side bending parts bent toward the center of the extrusion tube.

3. A mud pipe extrusion device according to claim 2, characterized in that: The bending amplitude of the upper bending portion is greater than the bending amplitude of the side bending portion.

4. A mud pipe extrusion device according to claim 3, characterized in that: The width of the upper part of the closed-end discharge nozzle is greater than the width of the lower part.

5. A mud pipe extrusion device according to claim 4, characterized in that: The generatrix of the arc section at the lower part of the closing-end type discharge nozzle coincides with the generatrix of the extrusion tube.

6. A mud pipe extrusion device according to claim 1, characterized in that: The outer end of the extrusion tube is connected with an arc-shaped material guide plate arranged obliquely downwards, and an arc-shaped transition support plate is arranged between the arc-shaped material guide plate and the outer end of the extrusion tube, and the transition support plate is arranged coaxially with the extrusion tube.

7. A method for extruding a fish-scale composite pipe for farmland irrigation, comprising a mud pipe extrusion device according to any one of claims 1 to 6, characterized in that it comprises the following steps: Step 1: The auger rotates to compress the moist soil-straw mixture in the conical extrusion bin into the extrusion tube; Step 2: The mixed material is compressed and compacted in the extrusion tube, and a composite tube is formed under the action of the central forming column and extruded from a closed-end discharge nozzle; Step 3: During extrusion, the upper part and the inwardly closing bending structures of the closing type discharge nozzle can slightly bend the composite tube downward and continuously scrape the outer side of the composite tube. Under the combined action of the bending force and the scraping force, the outer side of the composite tube is continuously bent and scraped to form fish scales, and the water seepage openings between the fish scales extend into the tube wall of the composite tube; Step 4: After the fish-scale composite tube is extruded, the transition support plate provides it with temporary horizontal support, and then it moves downward into the arc-shaped guide plate.

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