Open water and hidden drainage system for northeast black soil area slope cropland

Abstract

The utility model belongs to the field of farmland water and soil conservation and farmland water conservancy engineering, and particularly relates to an open water hidden drainage system for northeast black soil area slope cropland, which comprises a hidden pipe and a vertical shaft, the vertical shaft is arranged in a necessary drainage area of the cropland, and the vertical shaft is a plastic hard pipe with a plurality of water inlets on the surface. The vertical shaft is connected into the concealed pipe through a pipeline connecting piece, and the pipeline connecting piece comprises a tee joint and an elbow; the concealed pipe is a corrugated permeable pipe, the concealed pipe is obliquely buried in the cultivated land stratum, and the burying depth is 50-80 cm; the lower end of the concealed pipe is a water outlet; the drainage device can effectively solve the current situation that water is accumulated on the earth surface of the northeast black soil area and drainage is difficult and the problem of output reduction caused by water and soil loss, land erosion and crop waterlogging disaster caused by the current situation, accurate and effective drainage is achieved in a high-efficiency and low-cost mode without occupying cultivated land, farmland productivity and soil stability are improved, and economic benefits are improved. Meanwhile, mechanical construction is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to farmland water and soil conservation and farmland water conservancy engineering technical field, specifically related to a kind of open water and dark system for the slope farmland of northeast black soil area. BACKGROUND

[0002] The organic matter content in the northeast black soil of China is high, and the soil particles are relatively fine, usually being clay soil or clay loam. Due to the rich clay minerals, it expands after absorbing water, reducing the pore space. The precipitation in the northeast region is mostly concentrated in short-time rainstorms in summer. This concentrated precipitation can quickly exceed the soil absorption capacity, leading to more obvious waterlogging and runoff phenomena, and easily causing water retention on the soil surface or surface runoff, forming "fish eye bubbles" or water lines, affecting the utilization of cultivated land and the growth of crops. Traditional drainage methods such as open channel drainage or horizontal terrace and ridge plant belt indirect drainage measures can alleviate some waterlogging problems, but are high in cost, inconvenient for mechanized operation, especially occupy cultivated land, and occupy the surface, which reduces the arable area and increases the risk of water and soil loss.

[0003] In recent years, the underground pipe drainage technology has been gradually applied in agricultural production. The underground pipe drainage technology is to bury pipes with water permeability function at appropriate positions underground for controlling groundwater level, regulating soil moisture, and improving soil physical and chemical properties, thereby achieving the technical measures for promoting agricultural production and ecological protection. In the early stage, clay pipes, tile pipes, bamboo, reed, and sand were used for drainage; however, these materials are prone to loose and clog during use, time-consuming and labor-intensive, and have a small application area. Later, PVC / PE material pipes were introduced to the market, greatly reducing the complexity of underground pipe laying. However, for areas with concentrated water on cultivated land, due to the small hole drainage of underground pipes, the purpose of drainage cannot be achieved quickly.

[0004] Therefore, it is necessary to provide an improved technical solution to overcome the deficiencies of the existing technology. UTILITY MODEL CONTENT

[0005] The utility model aims to overcome the deficiencies of the existing technology and provide an open water and dark system for the slope farmland of northeast black soil area, which can effectively solve the current situation of surface waterlogging and drainage difficulties in the northeast black soil area, as well as the problems of water and soil loss, land erosion, and crop flooding leading to reduced production. Without occupying cultivated land, the system realizes precise and effective drainage through an efficient and low-cost method, thereby improving farmland productivity and soil stability, and facilitating mechanized construction.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0007] A kind of open water dark discharge system for northeast black soil region slope farmland, including pipe and shaft, the shaft is set in farmland necessary drainage area, the shaft is the plastic hard pipe with several water inlets on surface, the shaft is connected into pipe by pipe connector, the pipe connector includes tee and elbow, elbow application scenario is in the case of the initial section of pipe plus shaft;The pipe is corrugated water-permeable hose, the pipe is obliquely buried in farmland soil layer, and the buried depth is 50-80 cm;The lower end of the pipe is a drainage port.

[0008] Further, the pipe has a certain strength in the radial direction, otherwise it is easy to be pressed flat by soil, and it can be rolled up in the length direction, facilitating the disc on the rotating pipe rack construction;The pipe is a perforated corrugated hose or a perforated steel wire hose, and the pipe is wrapped with a geotextile or non-woven fabric layer.

[0009] Further, the diameter of the shaft is 90-120 mm, and the diameter of the pipe is the same as that of the shaft, so that an equal-diameter tee can be used;If the diameter of the shaft and the pipe is not the same, a variable-diameter tee needs to be used, which increases the complexity of the operation.

[0010] Further, the slope of the farmland ranges from 0.5 to 7°, and the inclination angle of the pipe is consistent with or slightly different from the farmland, also ranging from 0.5 to 7°.

[0011] In one embodiment, a pipe is composed of several truncated sub-pipes, and the two tees are connected by the sub-pipes.

[0012] In another embodiment, the tee includes an upper shell and a lower shell that are connected in a vertical manner, the upper shell is provided with a pipe connection part for connecting with the shaft, the upper shell and the lower shell are provided with pipe connection parts at both ends of the length for connecting with the pipe, and the inner wall of the pipe connection part is provided with a sealing body;The upper shell and the lower shell are connected into an integrated body by a fastener and are sealed and wrapped outside the pipe.

[0013] Further, the pipe wrapped in the tee is provided with a cut-off hole, and the pipe connection part is completely projected in the cut-off hole.

[0014] Further, the cut-off hole is formed by cutting off the upper middle part of the circumferential surface of the pipe corresponding to the position of the shaft.

[0015] Further, the top of the shaft is provided with a well head, and the well head is provided with a cover.

[0016] Further, the shaft is a PVC hard pipe with a diameter of 110 mm, and 5-8 rows of water inlets are vertically arranged on the shaft, the water inlet hole diameter is 20-30 mm, and the distance between the two adjacent water inlets in the same row is 50-70 mm.

[0017] The beneficial effects of the utility model are:

[0018] The vertical shaft and the buried pipe are made of plastic material, low cost, easy to process and manufacture, and the buried pipe is a flexible pipe, which can be constructed by a buried pipe plow (a ditching pipe burying machine) and connected with the vertical shaft through a tee joint, high construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of the specification illustrate the present application and, along with the description, serve to explain the principles of the present application. In the drawings:

[0020] Figure 1 The structure of the utility model embodiment is shown in the figure.

[0021] Figure 2 The structure of the utility model's integrated tee joint is shown in the figure.

[0022] Figure 3 The structure of the utility model's half tee joint is shown in the figure.

[0023] Figure 4 The structure of the utility model's cutting hole is shown in the figure.

[0024] Figure 5 The structure of the utility model application example 1 is shown in the figure.

[0025] Figure 6 The structure of the utility model application example 2 is shown in the figure.

[0026] In the figure: 1-buried pipe, 11-cutting hole, 2-vertical shaft, 21-shaft head, 22-water inlet, 3-drainage outlet, 31-pipe joint, 32-upper shell, 33-lower shell, 34-fastener, 35-sealing body, 36-upper connecting plate, 37-lower connecting plate, 100-natural water line, 200-equal-width dike. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0028] The present application will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0029] As Figures 1 to 6As shown, a kind of open water and dark drainage system for the slope farmland of northeast black soil area, including pipe 1, shaft 2 and pipe connecting piece, the shaft 2 is set in the necessary drainage area of farmland, the shaft 2 is the plastic hard pipe with several water inlets 22 on surface, the shaft 2 is connected with pipe 1 by pipe connecting piece, to guide surface water into pipe 1;The pipe connecting piece includes tee and elbow, the application scenario of elbow is in the case of adding shaft to the initial section of pipe;Pipe 1 is perforated corrugated hose or perforated steel wire hose, pipe 1 is wrapped with geotextile or non-woven fabric layer for filtering silt, to prevent blockage;Pipe 1 is obliquely buried in farmland stratum, the lower end of pipe 1 is drainage port 3;According to topography, landform and soil, pipe 1 is set to be between 50-80 cm in depth, to ensure drainage efficiency (too deep, slow infiltration), reduce construction cost and plough layer disturbance, surface soil and subsoil are not mixed, and the safety and stability of pipeline are also considered.

[0030] Further, as shown in Figures 1 to 4 , the diameter of shaft 2 is 90-120mm (for example, 90mm, 100mm, 105mm, 110mm, 115mm or 120mm), and the diameter of pipe 1 is the same as that of shaft 2. The slope of the farmland ranges from 0.5 to 7°, and the inclination angle of pipe 1 is consistent with or slightly different from the slope, also ranging from 0.5 to 7°.

[0031] Further, as shown in Figure 2 , Figure 3 , the top of shaft 2 is provided with well head 21, and the well head 21 is provided with a cover. The well head 21 protects the upper end of shaft 2 to a certain extent. The cover prevents sundries from falling into shaft 2. When it is necessary to observe the situation in shaft 2, the cover can be removed.

[0032] Further, the shaft 2 is a PVC hard pipe with a diameter of 110mm, and 5-8 rows of water inlets are vertically arranged on the shaft 2. The diameter of water inlet 22 is 20-30mm, and the distance between two adjacent water inlets in the same row is 50-70mm.

[0033] In one embodiment, as shown in Figure 2 , the tee is an integrated tee, one pipe 1 is composed of several truncated sub-pipes, and the two tees are connected by sub-pipes. During construction, one pipe 1 is laid at one time by using pipe plow, then the soil is compacted, and then the soil is excavated at the selected site. The two pairs of ends of the tee are corrugated pipe interfaces, and the top interface is used for threaded connection or hot melting connection with the shaft 2. When the tee is connected, the pipe is truncated, then it is connected with the tee, and finally the shaft 2 is installed on the tee. Pipe 1 is perforated corrugated hose or perforated steel wire hose, and perforated corrugated hose is preferably used. Therefore, the truncation of pipe 1 and the connection with the tee are relatively easy.

[0034] In another embodiment, as shown in Figure 3 the tee is a half tee, the tee comprises an upper shell 32 and a lower shell 33 which are vertically connected, the upper shell 32 is provided with a pipe joint 31 for connecting with the shaft 2; the upper shell 32 and the lower shell 33 are provided with pipe joints at both ends of the length, the inner wall of the pipe joint is provided with a sealing body 35; the upper shell 32 and the lower shell 33 are connected into one body by a fastener 34 and are sealed and wrapped outside the buried pipe 1.

[0035] Further, the fastener 34 can be a bolt and nut connection or a quick release buckle connection; when using a bolt connection, the straight edge of the upper shell 32 is provided with an upper connecting plate 36, and the straight edge of the lower shell 33 is provided with a lower connecting plate 37, mounting holes should be provided on the upper connecting plate 36 and the lower connecting plate 37, and the nut is pre-fixed at the mounting hole position of the lower shell 33, and an electric screwdriver can be used to quickly fix the half tee during plowing. The pipe joint 31 is connected with the shaft 2 by heat melting or threading, in order to facilitate the construction on site, the shaft 2 and the upper shell 32 can be connected on the open land on the plowing side, and then the connection body of the shaft 2 and the upper shell 32 and the lower shell 33 can be moved to the selected installation position of the shaft 2.

[0036] On the basis of the last embodiment, as shown in Figure 3 the vertical pipe and the buried pipe 1 are connected in a similar way to the integrated tee, that is, a section of the buried pipe 1 is cut off and connected by a tee.

[0037] In another embodiment, as shown in Figure 4 a half tee is used, and the buried pipe 1 and the tee have other connection structures: the buried pipe 1 wrapped in the tee is provided with a cutout hole 11, the pipe joint 31 is completely projected in the cutout hole 11, and the cutout hole 11 is formed by cutting the upper half of the circumferential surface of the buried pipe 1 corresponding to the position of the shaft 2 in the tee. Figure 4 From the left and right directions, the length of the cutout hole 11 is not less than the outer diameter of the shaft 2, and the maximum length of the two ends of the cutout hole 11 is not more than half the length of the pipe joint, which provides the necessary contact area for the tight connection of the sealing body 35, the pipe joint and the buried pipe 1; from the cross section of the buried pipe 1, the central angle of the wall of the buried pipe 1 corresponding to the cutout hole 11 is 90°-180°; preferably, a convex strip corresponding to the thread of the buried pipe 1 is arranged on the inner wall of the pipe joint and the lower shell 33, so as to increase the sealing connection degree of the buried pipe 1 and the tee;

[0038] The connection structure of the tee joint and the pipe 1 is adopted, and when the tee joint is installed, the pipe 1 does not need to be hot-melted or screwed to match the threads of the corrugated hose, the pipe 1 is directly lifted, the lower shell 33 is inserted into the pipe 1 below, then the upper shell 32 is installed after the cutting hole 11 is cut on site. Since the pipe 1 is no longer segmented / segmented, the pipe 1 is positioned with the tee joint when the tee joint is installed, and large and medium-sized installation equipment is not used, the on-site construction is more convenient, and the cutting of the pipe 1 produces less waste. In addition, the water infiltrated in the shaft 2 is directly collected and falls into the pipe 1, reducing the loss of water flow.

[0039] Since the shaft 2 may affect the normal operation of the agricultural equipment during the operation season, the shaft 2 can be removed during the operation season, and the shaft 2 is installed before the rainy season. In order to facilitate the removal of the shaft 2, in one embodiment, as shown in Figure 4 , the shaft 2 is threadedly connected with the tee joint, the shaft 2 is excavated and removed before the rainy season, and the pipe joint part 31 is plugged to prevent soil from falling into the tee joint. Preferably, in order to reduce the influence of the tee joint on the operation of the agricultural equipment, the pipe joint part 31 is internally arranged, that is, on the basis of ensuring the connection length with the shaft 2, part of the pipe joint part 31 is arranged in the internal space of the upper shell 32, so as to reduce the height of the pipe joint part 31.

[0040] The use method of the utility model is as follows:

[0041] 1. Determine the position of the fish eye bubble of the farmland:

[0042] Determine the lowest point of the local low-lying waterlogged area as the drainage port 3 through the high-precision map of the unmanned aerial vehicle, and record the geographic coordinates. The pipe 1 is arranged along these points and slopes, and the pipe 1 extends to the drainage ditch or other outlet at the edge of the farmland;

[0043] Use the land leveler to simply level the selected area, so that the ground surface does not appear obvious ups and downs, that is, the slope cannot be too large, so as to concentrate the water, ensure that the water collection area is suitable for arranging the shaft 2, and also do not seriously affect the agricultural equipment to pass through.

[0044] 2. Arrangement of the pipe 1:

[0045] According to the soil quality, select a light or heavy pipe plow; the light type is suitable for most soils, and the heavy type is suitable for relatively hard soil;

[0046] The planned area is scanned by the RTK unmanned aerial vehicle, a high-precision topographic map is generated by software calculation, and the direction of the pipe 1 arrangement is determined according to the positions of the natural water line 100 and the equal-width ridge 200;

[0047] In some low-lying serious land that is not suitable for the design of shaft 2, instead of the shaft 2, the buried pipe 1 is arranged, and then the water is discharged through the larger diameter water collecting pipe. The line of each buried pipe 1 is drawn manually on ArcGIS or professional engineering software;

[0048] The pipe is arranged according to the line designed by the software, and the elevation, slope and direction are automatically controlled by the buried pipe plow, so that the ditching, pipe laying and filter material laying are completed at one time, the construction is simple, efficient and high in precision. The buried pipe 1 is a long-life perforated water suction pipe with a diameter of 110 mm, which is arranged from the water outlet to the top.

[0049] 3. Soil treatment after laying of the buried pipe 1:

[0050] After the buried pipe 1 is arranged, the soil is compacted by a compactor. If the soil humidity is high, the soil surface is leveled by a rotary cultivator or a heavy harrow if necessary.

[0051] 4. Installation and maintenance of the shaft 2:

[0052] Shaft 2 connection: the soil is excavated at the selected low-lying point and the necessary drainage area, a tee joint is used to connect the shaft 2, and the slope and area (20-40 square meters) of the water collecting area are trimmed. As shown in FIG. 6, the open water and buried drainage system is laid. Figure 1

[0053] Periodic cleaning and maintenance: mark the shaft 2 during the busy season to avoid damage, and clean the surrounding dry branches, leaves and other debris and silt; if necessary, remove the shaft 2 during the operation season, and reinstall it before the rainy season.

[0054] The utility model discloses a buried pipe plow technology, which is simple to operate, realizes ditching, pipe laying, filter material laying (optional), covering and restoring at one time, and the surface soil and the subsoil are not mixed, so that the soil structure is effectively protected. In addition, the buried pipe 1 is convenient to manage, does not occupy arable land, and increases the arable land compared with open ditch drainage. Through the buried drainage system, the crop yield can be increased by 10% to 35%, the status of surface water accumulation and difficult drainage in the northeast black soil area can be effectively solved, the farmland productivity and soil stability are improved, and strong support is provided for the sustainable development of agriculture in the northeast region.

[0055] Next, the structure and use method of the utility model will be described in combination with two specific arable land conditions.

[0056] Application Example 1

[0057] In a certain arable land of the Friendship Farm, there is a pot bottom type slope in the middle of the land, and most of the time, the land is waterlogged in the rainy season, resulting in yield reduction, and in severe cases, affecting autumn harvest, land preparation and sowing in the next year.​

[0058] First, use RTK unmanned aerial vehicle to scan the area, get the gentle slope area of 31.9 hectares, slope 4°, slope length 550 meters. Combined with remote sensing image, determine the long-term natural water line and the accurate position of low-lying and prone to flooding, determine the layout of the pipe;

[0059] After autumn harvest, the land is leveled, and it is best to build a ridge after that, which is convenient for finding the pipe when building a vertical shaft. The light pipe plow is used to lay the pipe, and the pipe is a 110mm polyethylene (PE) corrugated pipe covered with a non-woven fabric filter. The pipe is punched in a strip shape, with a hole diameter of 10mm x 1mm, to prevent soil from entering and causing blockage. In this embodiment, the light pipe plow is used to lay the pipe, which has the characteristics of scientific layout and stable operation of the drainage system, accurate control of elevation and slope, relatively small disturbance to the soil, and no change in soil layers. The cost is low, and the laying efficiency is high, with a cost of 30 yuan per meter, and 1.2 kilometers per hour.

[0060] After the pipe is laid, use a roller or rotary cultivator to smooth the marks left by the pipe laying.

[0061] Build a vertical shaft at the pre-designed catchment location. First, dig the soil to find the already laid pipe; then connect the vertical shaft to the pipe through a tee or elbow to guide the surface water into the pipe system. The pipe material of the vertical shaft is a 110mm PVC pipe, with six rows of 25mm diameter holes drilled by a drill as water inlet holes, with a spacing of 60mm. For example Figure 5 The structure diagram of the open water and pipe drainage system of the application example.

[0062] After the tee is connected, clean up the site, keep the farmland clean, and modify the 20-40 square meter surface into a slow slope to facilitate the passage of agricultural machinery. Mark the location, and if necessary, insert a red flag the next year, or assign personnel to stand by during agricultural operations to prevent damage to the vertical shaft.

[0063] Application Example 2

[0064] In a certain piece of sloping farmland in Youyi Farm, there were several long-term water lines in the middle of the land, which caused internal flooding during the rainy season, resulting in yield reduction, and in severe cases, affecting autumn harvest, land preparation, and sowing the next year.

[0065] First, use RTK unmanned aerial vehicle to scan the area, get the gentle slope area of 31.9 hectares, slope 4°, slope length 550 meters. Combined with remote sensing image, determine the long-term natural water line and the accurate position of low-lying and prone to flooding, determine the layout of the pipe;

[0066] After the harvest, the land is leveled, and preferably after the ridges are built, which facilitates the construction of the shaft and the finding of the buried pipe. The light buried pipe plow is used to lay the buried pipe, and the buried pipe is a 100mm polyethylene (PE) corrugated pipe covered with a filter made of a punched non-woven fabric. The holes in the pipe are in the shape of a flat strip, with a diameter of 10mm x 1mm, to prevent soil from entering and causing blockage.

[0067] After the buried pipe is laid, the marks left by the buried pipe are leveled using a roller or a rotary tiller.

[0068] A shaft is built at the catchment of the pre-designed shallow ditch with equal height and width dikes. First, the soil is dug to find the already laid buried pipe, and then the shaft is connected to the buried pipe through a tee or elbow to guide the surface water into the buried pipe system. The pipe material of the shaft is a 100mm PVC pipe, and six rows of 22mm diameter holes are drilled on the pipe with a spacing of 58mm. For example, Figure 6 The structure diagram of the open water buried drainage system of the present application example.

[0069] After the tee is connected, the site is cleaned, the farmland is kept clean, and the 20-40 square meter surface is modified into a slow slope to facilitate the passage of agricultural machinery. Markers are placed, and if necessary, red flags are inserted the next year, or personnel are stationed during agricultural operations to prevent damage to the shaft.

[0070] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are within the scope of the present application.

Claims

1. A surface open and subsurface drainage system for the slope farmland in the Northeast Black Soil Region, comprising a subsurface pipe (1) and a vertical shaft (2), characterized in that: The vertical shaft (2) is arranged in the necessary drainage area of the cultivated land, the vertical shaft (2) is a plastic hard pipe with several water inlets (22) on the surface, the vertical shaft (2) is connected to the underground pipe (1) through a pipe connecting piece, the pipe connecting piece comprises a tee joint; the underground pipe (1) is a corrugated water permeable pipe, the underground pipe (1) is obliquely buried in the cultivated land soil layer, and the buried depth is 50-80 cm; the lower end of the underground pipe (1) is a drainage outlet (3).

2. The open water and closed drainage system for the slope farmland in the Northeast Black Soil Region according to claim 1, characterized in that: The underground pipe (1) is a perforated corrugated hose or a perforated steel wire hose, and the underground pipe (1) is wrapped with a geotextile or a non-woven fabric layer.

3. The open water and closed drainage system for the slope farmland in the Northeast Black Soil Region according to claim 1, characterized in that: The diameter of the vertical shaft (2) is 90-120 mm, and the diameter of the underground pipe (1) is the same as that of the vertical shaft (2).

4. The open water and closed drainage system for the slope farmland in the Northeast Black Soil Region according to claim 1, characterized in that: The inclination angle of the underground pipe (1) is 0.5-7°.

5. The open water and closed drainage system for the slope farmland in the Northeast Black Soil Region according to claim 1, characterized in that: The tee joint is integrally formed, one underground pipe (1) is composed of several truncated sub-pipes, and the two tee joints are connected by the sub-pipes.

6. The open water and closed drainage system for the slope farmland in the Northeast Black Soil Region according to claim 1, characterized in that: The tee joint comprises an upper shell (32) and a lower shell (33) which are in upper and lower butt joint, the upper shell (32) is provided with a pipe joint (31) for connecting with the vertical shaft (2), the length of the upper shell (32) and the lower shell (33) is provided with a pipe joint part for connecting with the underground pipe (1), and the inner wall of the pipe joint part is provided with a sealing body (35); the upper shell (32) and the lower shell (33) are connected into an integral body by a fastener (34) and are sealed and wrapped outside the underground pipe (1).

7. The open water and closed drainage system for the slope farmland in the Northeast Black Soil Region according to claim 6, characterized in that: The underground pipe (1) wrapped in the tee joint is provided with a cut-off hole (11), and the pipe joint (31) is completely projected in the cut-off hole (11).

8. The open water and closed drainage system for the slope farmland in the Northeast Black Soil Region according to claim 7, characterized in that: The cut-off hole (11) is formed by cutting off the upper middle part of the circumferential surface of the underground pipe (1) corresponding to the position of the vertical shaft (2) in the tee joint.

9. The open water and closed drainage system for the slope farmland in the Northeast Black Soil Region according to claim 1, characterized in that: The top of the vertical shaft (2) is provided with a well head (21), and the well head (21) is provided with a cover.

10. The open water and closed drainage system for the slope farmland in the Northeast Black Soil Region according to claim 1, characterized in that: The vertical shaft (2) is a PVC hard pipe with a diameter of 110 mm, 5-8 rows of water inlets are vertically arranged on the vertical shaft (2), the diameter of the water inlet (22) is 20-30 mm, and the distance between two adjacent water inlets in the same row is 50-70 mm.

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