Underground drip irrigation emitter

Abstract

The utility model provides an underground drip irrigation emitter, and relates to the technical field of drip irrigation. The underground drip irrigation emitter comprises a support, a water collecting device, a regulating valve and a plurality of outflow devices. The support comprises a plurality of supporting legs, and a water supply channel is arranged in each supporting leg. The water collecting device is provided with a water collecting cavity and installed on the support. The adjusting valve is movably connected with the support and used for enabling the water collecting cavity to be selectively communicated with part of the water supply channels. The outflow devices communicate with the water supply channels in a one-to-one correspondence mode. The irrigation emitter can achieve alternate drip irrigation, local irrigation water flow is pulse water flow, the blocking condition of the irrigation emitter is reduced through the intermittent water hammer effect, and the irrigation efficiency is improved; meanwhile, different sides of the crops can be subjected to drip irrigation, drip irrigation is uniform, and the root systems of the crops are not prone to lateral growth.

Description

Technical Field

[0001] The utility model relates to the technical field of drip irrigation, and particularly to a subsurface drip irrigation emitter. Background Art

[0002] Drip irrigation is a method of agricultural irrigation that can effectively improve the utilization rate of water resources. Generally, plastic pipes are used to send water through orifices or emitters on a capillary with a diameter of about 10 mm to the roots of crops for local irrigation. During operation, according to the water requirements of crops, water and the water and nutrients required by crops are evenly and slowly dripped into the root zone soil of crops in the form of water droplets through a pipeline system and emitters installed on the capillary. Since drip irrigation does not damage the soil structure, the water, fertilizer, air, and heat inside the soil are often maintained in a good state suitable for crop growth, with small evaporation losses, no surface runoff, and almost no deep leakage. Therefore, drip irrigation belongs to a water-saving irrigation method. In the prior art, subsurface irrigation is a continuous irrigation method, which is prone to deep leakage of water, and the underground water outlet micropores are blocked due to negative pressure suction of mud after irrigation stops; in addition, existing drip irrigation pipes are generally arranged on one side of the plant roots, resulting in uneven irrigation and inducing lateral growth of crop roots. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a subsurface drip irrigation emitter, which can achieve alternate drip irrigation, making the local irrigation water flow a pulsed water flow. The intermittent water hammer effect reduces the blockage of the emitter and improves the irrigation efficiency; at the same time, different sides of the crop can be drip-irrigated evenly, and the crop roots are not prone to lateral growth.

[0004] The embodiments of the utility model are implemented as follows:

[0005] In a first aspect, the utility model provides a subsurface drip irrigation emitter, including:

[0006] A bracket, a water collection device, a regulating valve, and a plurality of outflow devices; the bracket includes a plurality of legs, and a water supply channel is arranged inside each leg; the water collection device is provided with a water collection cavity, and the water collection device is installed on the bracket; the regulating valve is movably connected to the bracket, and the regulating valve is used to selectively communicate the water collection cavity with some of the plurality of water supply channels; the plurality of outflow devices are respectively and correspondingly communicated with the plurality of water supply channels.

[0007] In an optional embodiment, the regulating valve is rotatably matched with the bracket to change the water supply channels communicated with the water collection cavity through the regulating valve.

[0008] Based on the above solution, by rotating the regulating valve, the position of the regulating valve is changed, and then the regulating valve is used to connect the water collecting cavity with the corresponding water supply channel. The water collecting cavity transports the solution to the water supply channel through the regulating valve, and then flows out from the corresponding outflow device for drip irrigation operation. The adjustment method of the regulating valve is simple and the operation is flexible.

[0009] In an alternative embodiment, the regulating valve is provided with a communication hole. During the rotation of the regulating valve relative to the bracket, the water collecting cavity can be connected with the corresponding water supply channel through the communication hole.

[0010] Based on the above solution, by adjusting the position of the communication hole, after the communication hole is connected with the corresponding water supply channel, the water collecting cavity can transport the solution to the corresponding water supply channel through the communication hole, and then the outflow device connected with the water supply channel is used for drip irrigation operation, and the operation is convenient and flexible.

[0011] In an alternative embodiment, the regulating valve includes a driver and a valve plate. The driver is installed on the bracket, the communication hole is arranged on the valve plate, the valve plate is connected with the driver, and the valve plate is used to rotate relative to the bracket under the drive of the driver.

[0012] Based on the above solution, the valve plate is driven by the driver to rotate, realizing automatic control, and the adjustment is flexible and convenient.

[0013] In an alternative embodiment, the peripheral wall of the water collecting cavity is set as a conical surface, the side with a smaller diameter of the conical surface is set as an open end, the regulating valve is installed at the open end, and the regulating valve is used to rotate relative to the open end to adjust the connection state between the open end and the corresponding water supply channel.

[0014] Based on the above solution, the solution in the water collecting cavity is convenient to discharge from the open end and is not easy to remain in the water collecting cavity, improving the utilization efficiency of the solution.

[0015] In an alternative embodiment, the water collecting device is provided with a water inlet hole communicating with the water collecting cavity.

[0016] Based on the above solution, the solution is supplemented to the water collecting cavity through the water inlet hole, and the operation is convenient.

[0017] In an alternative embodiment, a filter screen is installed in the water collecting cavity, and the filter screen is used to filter the liquid entering the water collecting cavity from the water inlet hole.

[0018] Based on the above solution, the solution entering the water collecting cavity from the water inlet hole is first filtered by the filter screen and then flows out from the corresponding outflow device for drip irrigation of crops, which is beneficial for the crops to absorb and is not easy to block the outflow device.

[0019] In an alternative embodiment, the outflow device includes a dropper, the dropper is connected to the bracket, and the water supply channel communicates with the lumen of the dropper.

[0020] Based on the above solution, the tip of the dropper is a conical end, which is beneficial for inserting into the soil.

[0021] In an alternative embodiment, the bracket further includes a positioning member, the positioning member is installed between the plurality of legs, and the positioning member is used for positioning the crop.

[0022] Based on the above solution, during the growth process of the crop, it relies on the positioning member for positioning, so the crop is not easily toppled and has a high survival rate.

[0023] In an alternative embodiment, the positioning member includes a connecting rod and a positioning ring. One end of the connecting rod is connected to the leg, and the other end of the connecting rod is connected to the positioning ring. The positioning ring is used for sleeving outside the crop.

[0024] Based on the above solution, the connecting rod can be set as a telescopic rod. By adjusting the length of the connecting rod, the position of the positioning ring can be adjusted, so that the position of the positioning ring better matches the position of the crop, which is beneficial for guiding the growth of the crop.

[0025] The beneficial effects of the embodiments of the present utility model are:

[0026] In summary, for the underground drip irrigation applicator provided in this embodiment, both the outflow device and the bracket are inserted into the soil. The outflow device and the water collection device are positioned by relying on the bracket. Moreover, the multiple legs on the bracket are respectively connected to multiple outflow devices in one-to-one correspondence, and each leg plays a role in transporting the solution. The functions of the bracket are diversified, eliminating the need for a separate support device, simplifying the structure, and reducing costs. At the same time, the multiple legs are distributed around the crop, and the multiple outflow devices are distributed around the crop, which can irrigate the soil around the crop and improve the irrigation uniformity. During the drip irrigation operation, by adjusting the position of the regulating valve, the water collection chamber of the water collection device can be alternately communicated with multiple water supply channels, so that the multiple outflow devices can alternately perform drip irrigation operations to achieve the purpose of alternate irrigation. Through alternate irrigation, the local irrigation water flow becomes a pulsed water flow, and the intermittent water hammer effect reduces the clogging of the irrigation applicator and improves the irrigation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0028] Figure 1 Schematic diagram of the underground drip irrigation emitter according to an embodiment of the present utility model;

[0029] Figure 2 Schematic diagram of the valve plate according to an embodiment of the present utility model;

[0030] Figure 3 Schematic diagram of a variant of the underground drip irrigation emitter according to an embodiment of the present utility model;

[0031] Figure 4 Schematic diagram of the positioning member according to an embodiment of the present utility model.

[0032] Icon:

[0033] 100 - support; 110 - leg; 111 - water supply channel; 120 - top plate; 200 - water collection device; 210 - water collection cavity; 211 - conical surface; 220 - water inlet hole; 300 - regulating valve; 310 - driver; 320 - valve plate; 321 - communication hole; 400 - outflow device; 500 - positioning member; 510 - connecting rod; 520 - positioning ring. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0036] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0038] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0039] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] In the prior art, a drip irrigation system generally includes a drip irrigation rack and multiple drip irrigation pipes. The drip irrigation rack is made by overlapping rods. The end of the drip irrigation rack is inserted into the soil. The drip irrigation pipes are installed on the drip irrigation rack, and one end of the drip irrigation pipe is inserted into the soil and located on one side of the crop. During operation, the solution is transported into multiple drip irrigation pipes, and the solution in each drip irrigation pipe seeps into the soil to supply water to the crop. The drip irrigation rack occupies part of the land space, increasing the spacing between adjacent crops and reducing the crop density; the drip irrigation pipes are located on one side of the crop, which is one-sided drip irrigation, and the irrigation is uneven, inducing the lateral growth of crop roots; in addition, the drip irrigation pipes operate synchronously or stop synchronously, and the underground water outlet micropores are blocked due to negative pressure suction of mud after irrigation stops.

[0041] Please combine Figures 1-4 , in view of this, the designer provides an underground irrigation water applicator. By arranging a plurality of outflow devices 400 around the same plant and making the plurality of outflow devices 400 operate alternately, alternate drip irrigation can be achieved, so that the local irrigation water flow is a pulsed water flow, and the intermittent water hammer effect reduces the blockage of the water applicator and improves the irrigation efficiency; at the same time, different sides of the crop can be drip-irrigated, the drip irrigation is uniform, and the crop roots are not prone to lateral growth.

[0042] Please refer to Figure 1 In this embodiment, the underground drip irrigation emitter includes a support 100, a water collection device 200, a regulating valve 300, and a plurality of outflow devices 400; the support 100 includes a plurality of legs 110, and a water supply channel 111 is arranged inside each leg 110; the water collection device 200 is provided with a water collection cavity 210, and the water collection device 200 is installed on the support 100; the regulating valve 300 is movably connected to the support 100, and the regulating valve 300 is used to selectively communicate the water collection cavity 210 with some of the water supply channels 111 among the plurality of water supply channels 111; the plurality of outflow devices 400 are respectively in one-to-one correspondence and communication with the plurality of water supply channels 111.

[0043] Continuing from the above, the working method of the underground drip irrigation emitter provided in this embodiment is as follows:

[0044] Both the outflow device 400 and the legs 110 of the support 100 are inserted into the soil, and the insertion depth of the legs 110 is set as required, which is not specifically limited in this embodiment. The positioning of the outflow device 400 and the water collection device 200 is realized by relying on the support 100. Moreover, the plurality of legs 110 on the support 100 are respectively connected to the plurality of outflow devices 400 in one-to-one correspondence. Each leg 110 plays a role in transporting the solution. The support 100 has diversified functions, eliminating the need for a separate support device, simplifying the structure, and reducing costs. At the same time, the plurality of legs 110 are distributed around the crop, and the plurality of outflow devices 400 are distributed around the crop, which can irrigate the soil around the crop and improve the irrigation uniformity. During the drip irrigation operation, by adjusting the position of the regulating valve 300, it is possible to alternately communicate the water collection cavity 210 of the water collection device 200 with the plurality of water supply channels 111, so that the plurality of outflow devices 400 alternately perform drip irrigation operations to achieve the purpose of alternate irrigation. Through alternate irrigation, the local irrigation water flow becomes a pulsed water flow, and the intermittent water hammer effect reduces the clogging of the emitter and improves the irrigation efficiency.

[0045] The following embodiments illustrate the details of the underground drip irrigation emitter provided in this application by way of examples.

[0046] Please refer to Figures 1-2 In this embodiment, optionally, the regulating valve 300 is rotatably engaged with the support 100 to change the water supply channel 111 communicating with the water collection cavity 210 through the regulating valve 300. By rotating the regulating valve 300, the position of the regulating valve 300 is changed, and then the regulating valve 300 is used to communicate the water collection cavity 210 with the corresponding water supply channel 111. The water collection cavity 210 transports the solution to the water supply channel 111 through the regulating valve 300, and then flows out from the corresponding outflow device 400 for drip irrigation operation. The adjustment method of the regulating valve 300 is simple and the operation is flexible.

[0047] Optionally, the regulating valve 300 is provided with a communication hole 321. During the rotation of the regulating valve 300 relative to the support 100, the water collecting cavity 210 can communicate with the corresponding water supply channel 111 through the communication hole 321. By adjusting the position of the communication hole 321, after the communication hole 321 communicates with the corresponding water supply channel 111, the water collecting cavity 210 can transport the solution to the corresponding water supply channel 111 through the communication hole 321, so as to perform drip irrigation operations using the outflow device 400 communicated with the water supply channel 111, and the operation is convenient and flexible.

[0048] For example, in this embodiment, the support 100 includes a top plate 120 and two legs 110. The two legs 110 are arranged axially symmetrically. The two legs 110 are both fixed to the bottom surface of the top plate 120 and are arranged at an acute angle. In the case of the same height, the distance between the two legs 110 is small, and the occupied space is small. It should be understood that the top plate 120 can be a disc, and the top plate 120 and the legs 110 can be arranged as an integral structure. Each leg 110 is internally provided with a water supply channel 111 extending in its length direction. The two ends of the water supply channel 111 respectively penetrate through the two side surfaces of the leg 110 in its length direction, and the water supply channel 111 penetrates through the top plate 120. The top port of the water supply channel 111 is used to communicate with the communication hole 321 on the regulating plate, and the bottom port of the water supply channel 111 communicates with the corresponding outflow device 400. When in use, when the regulating valve 300 rotates until the communication hole 321 communicates with the first channel in the two water supply channels 111, the solution in the water collecting cavity 210 can enter the first channel from the communication hole 321 and then flow out from the corresponding outflow device 400. The second channel in the two water supply channels 111 is not communicated with the water collecting cavity 210, and no drip irrigation operation will be performed. When the regulating valve 300 rotates, the position of the communication hole 321 changes. The communication hole 321 leaves the position of the first channel and moves to the position communicating with the second channel. The outflow device 400 communicated with the first channel stops drip irrigation, and the outflow device 400 communicated with the second channel performs drip irrigation, realizing alternate drip irrigation operations. It should be understood that in other embodiments, the number of legs 110 can be three, etc. Correspondingly, the number of outflow devices 400 can be three, etc. During the rotation of the regulating valve 300, the water collecting cavity 210 can be successively communicated with one or two of the three outflow devices 400.

[0049] Please combine Figure 1 and Figure 2 , in this embodiment, optionally, the regulating valve 300 includes a driver 310 and a valve plate 320. The driver 310 is installed on the support 100. The communication hole 321 is provided on the valve plate 320. The valve plate 320 can be a disc. The valve plate 320 is connected to the driver 310. The valve plate 320 is used to rotate relative to the top plate 120 of the support 100 under the drive of the driver 310. By driving the valve plate 320 to rotate through the driver 310, automatic control is realized, and the adjustment is flexible and convenient.

[0050] For example, the driver 310 can be an electric motor. The driver 310 can be fixed to the bottom of the bracket 100 by bolts. The output shaft of the driver 310 extends vertically.

[0051] Please refer to Figure 1 , in this embodiment, optionally, the peripheral wall of the water collecting chamber 210 is arranged as a conical surface 211. The side with a smaller diameter of the conical surface 211 is arranged as an opening. The regulating valve 300 is installed at the opening. The regulating valve 300 is used to rotate relative to the opening to adjust the communication state between the opening and the corresponding water supply channel 111. The solution in the water collecting chamber 210 is convenient to discharge from the opening and is not likely to remain in the water collecting chamber 210, improving the utilization efficiency of the solution.

[0052] Furthermore, a water inlet hole 220 communicating with the water collecting chamber 210 is arranged at the top of the water collecting device 200. The solution in the water collecting chamber 210 is replenished through the water inlet hole 220, which is convenient to operate.

[0053] In this embodiment, optionally, a filter screen is installed in the water collecting chamber 210. The filter screen is used to filter the liquid entering the water collecting chamber 210 from the water inlet hole 220. The solution entering the water collecting chamber 210 from the water inlet hole 220 is first filtered by the filter screen and then flows out from the corresponding outflow device 400 for drip irrigation of crops, which is beneficial for the crops to absorb and is not likely to block the outflow device 400.

[0054] In this embodiment, optionally, the outflow device 400 includes a dropper. The dropper is connected to the bracket 100, and the water supply channel 111 communicates with the lumen of the dropper. The tip of the dropper is a conical end, which is beneficial for inserting into the soil. It should be understood that the number of the outflow devices 400 is equal to and corresponds one by one to the number of the legs 110.

[0055] Please refer to Figure 3 and Figure 4 , in this embodiment, optionally, the bracket 100 further includes a positioning member 500. The positioning member 500 is installed between multiple legs 110. The positioning member 500 is used to position the crops. During the growth process of the crops, they rely on the positioning member 500 for positioning, and the crops are not likely to fall down and have a high survival rate.

[0056] Optionally, the positioning member 500 includes a connecting rod 510 and a positioning ring 520. One end of the connecting rod 510 is connected to the leg 110, and the other end of the connecting rod 510 is connected to the positioning ring 520. The positioning ring 520 is used to sleeved outside the crops. The connecting rod 510 can be set as a telescopic rod. By adjusting the length of the connecting rod 510, the position of the positioning ring 520 can be adjusted, so that the position of the positioning ring 520 is more matched with the position of the crops, which is beneficial for guiding the growth of the crops.

[0057] It should be understood that the connecting rod 510 may include a rod portion and a cylinder portion that are slidably engaged. The rod portion is inserted into the cylinder portion, and a damping ring is provided between the rod portion and the cylinder portion, and the two are in a damping fit. That is, under normal circumstances, when no external force acts on the rod portion and the cylinder portion, the rod portion and the cylinder portion will not slide relative to each other. Only when a force is applied to the rod portion and the cylinder portion can the length of the two be adjusted.

[0058] Alternatively, in other embodiments, the connecting rod 510 may be a rod with a fixed length. The number of connecting rods 510 is multiple, and the number of connecting rods 510 is the same as and corresponds to the number of legs 110 one by one. One end of each connecting rod 510 is connected to the corresponding leg 110, and the other ends are all connected to the positioning ring 520, which can improve the stability of the position of the positioning ring 520.

[0059] The underground drip irrigation emitter provided in this embodiment has multiple legs 110 distributed around the crop, and multiple outflow devices 400 are distributed around the crop, which can irrigate the soil around the crop and improve the irrigation uniformity. During the drip irrigation operation, by adjusting the position of the regulating valve 300, it is possible to alternately connect the water collection chamber 210 of the water collection device 200 to multiple water supply channels 111, so that multiple outflow devices 400 alternately perform drip irrigation operations to achieve the purpose of alternate irrigation. Through alternate irrigation, the local irrigation water flow becomes a pulsed water flow, and the intermittent water hammer effect reduces the clogging of the emitter and improves the irrigation efficiency.

[0060] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An underground drip irrigation emitter, characterized in that, Comprising: A support (100), a water collection device (200), a regulating valve (300), and a plurality of outflow devices (400); the support (100) includes a plurality of legs (110), and a water supply channel (111) is provided inside each leg (110); the water collection device (200) is provided with a water collection cavity (210), and the water collection device (200) is installed on the support (100); the regulating valve (300) is movably connected to the support (100), and the regulating valve (300) is used to selectively communicate the water collection cavity (210) with some of the water supply channels (111) among the plurality of water supply channels (111); the plurality of outflow devices (400) are respectively in one-to-one correspondence and communication with the plurality of water supply channels (111).

2. The underground drip irrigation emitter according to claim 1, wherein: The regulating valve (300) is rotatably matched with the support (100) to change the water supply channels (111) communicated with the water collection cavity (210) through the regulating valve (300).

3. The underground drip irrigation emitter according to claim 2, wherein: The regulating valve (300) is provided with a communication hole (321), and during the rotation of the regulating valve (300) relative to the support (100), the water collection cavity (210) can be communicated with the corresponding water supply channel (111) through the communication hole (321).

4. The underground drip irrigation emitter according to claim 3, wherein: The regulating valve (300) includes a driver (310) and a valve plate (320), the driver (310) is installed on the support (100), the communication hole (321) is provided on the valve plate (320), the valve plate (320) is connected to the driver (310), and the valve plate (320) is used to rotate relative to the support (100) under the drive of the driver (310).

5. The underground drip irrigation emitter according to claim 1, wherein: The peripheral wall of the water collection cavity (210) is provided as a conical surface (211), the side with a smaller diameter of the conical surface (211) is provided as an opening, the regulating valve (300) is installed at the opening, and the regulating valve (300) is used to rotate relative to the opening to adjust the communication state between the opening and the corresponding water supply channel (111).

6. The underground drip irrigation emitter according to claim 1, wherein: The water collection device (200) is provided with a water inlet hole (220) communicating with the water collection cavity (210).

7. The underground drip irrigation emitter according to claim 6, wherein: A filter screen is installed in the water collection cavity (210), and the filter screen is used to filter the liquid entering the water collection cavity (210) from the water inlet hole (220).

8. The underground drip irrigation emitter according to claim 1, wherein: The outflow device (400) includes a drip tube, the drip tube is connected to the support (100), and the water supply channel (111) communicates with the lumen of the drip tube.

9. The underground drip irrigation emitter according to claim 1, characterized in that: The bracket (100) further includes a positioning member (500), the positioning member (500) is installed between the plurality of legs (110), and the positioning member (500) is used for positioning crops.

10. The underground drip irrigation emitter according to claim 9, characterized in that: The positioning member (500) includes a connecting rod (510) and a positioning ring (520), one end of the connecting rod (510) is connected to the leg (110), the other end of the connecting rod (510) is connected to the positioning ring (520), and the positioning ring (520) is used for sleeving outside the crop.

Images