A spraying device of a three-dimensional circulating seedling production line

Abstract

The application belongs to the technical field of seedling raising device, and discloses a spraying device of a three-dimensional circulating seedling raising production line, which comprises a rack, chain conveyors arranged on both sides of the rack, wherein each chain conveyor comprises upper and lower end sprockets arranged on the rack, driving chains engaged with the upper and lower end sprockets, and a driving member for driving the lower end sprocket to rotate, a plurality of seedling trays are arranged between the driving chains of the two groups of chain conveyors, a spraying mechanism for spraying the seedling trays is arranged between the rack bodies on both sides of the rack, the spraying mechanism comprises a spraying assembly and a driving assembly, and the driving assembly is used for driving the spraying assembly to reciprocate between the rack bodies on both sides of the rack. The application drives the spraying head to reciprocate between the rack bodies on both sides of the rack to irrigate the seedling trays through the driving assembly, so that the coverage area of irrigation is improved.

Description

Technical Field

[0001] This utility model relates to the field of seedling raising equipment technology, and in particular to a spraying device for a three-dimensional circulating seedling raising production line. Background Technology

[0002] The spraying device in the three-dimensional circulating seedling production line is the core equipment used to precisely control the humidity of the seedling environment, replenish water, and apply water and fertilizer. Its design and operation directly affect the growth status and cultivation efficiency of the seedlings. Through automated or semi-automated methods, water or nutrient solution is evenly sprayed onto the seedlings in the multi-layered three-dimensional seedling trays (or seedling pots) to meet the seedlings' needs for water and nutrients at different growth stages.

[0003] A multifunctional and high-efficiency seedling raising machine is disclosed in Chinese utility model patent with announcement number CN220630256U. The machine includes a frame with two sets of chain conveyors arranged side by side on the frame. The conveyor chains of the chain conveyors are arranged in a wavy line. Multiple seedling trays are set between the two sets of chain conveyors. Seedling trays are equipped with seedling troughs. The seedling trays circulate under the drive of the two sets of chain conveyors. The machine also includes a spraying mechanism for watering the crops in the seedling trays and a supplemental lighting mechanism for providing supplemental lighting to the crops in the seedling trays.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: In the aforementioned equipment, the seedling trays achieve cyclical movement driven by the chain conveyor, and the seedling trays moving below them are sprayed by a fixed spraying mechanism. However, the area between two adjacent spray heads may be difficult to irrigate sufficiently. Therefore, the relevant technologies need to be improved and designed. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a spraying device for a three-dimensional circulating seedling production line.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a spraying device for a three-dimensional circulating seedling production line, including a frame, with chain conveyors on both sides of the frame. Each chain conveyor includes an upper sprocket and a lower sprocket mounted on the frame, and a drive chain meshing with both the upper and lower sprockets. A drive component is mounted on the frame to drive the lower sprocket to rotate. Multiple seedling trays are arranged between the drive chains of the two sets of chain conveyors. A spraying mechanism for spraying the seedling trays is arranged between the frame bodies on both sides of the frame. The spraying mechanism includes a spraying component and a drive component. The drive component is used to drive the spraying component back and forth between the frame bodies on both sides of the frame.

[0007] By adopting the above technical solution, the operator can use a drive unit to rotate the lower sprocket. The lower sprocket drives the upper sprocket to rotate via a drive chain, causing the seedling tray to move with the drive chain. The spraying component sprays the seedling tray during its low-speed movement. The drive unit allows the spraying component to move back and forth between the two sides of the frame, ensuring even spraying of different areas of the seedling tray. This application changes the traditional method of spraying seedling trays using a fixed spraying mechanism, improving the spray coverage and ensuring the seedling trays are thoroughly sprayed.

[0008] Furthermore, the drive assembly includes a U-shaped frame fixed to the two side frames of the machine frame, a reciprocating screw rotatably installed between the two side frames of the U-shaped frame, a sliding block slidably disposed on the reciprocating screw and threadedly connected to the reciprocating screw, a limiting rod fixed between the two side frames of the U-shaped frame and parallel to the reciprocating screw, and a drive motor disposed on the side wall of the U-shaped frame. The reciprocating screw passes through the side of the U-shaped frame near the drive motor and is fixed to the output end of the drive motor. The limiting rod passes through the sliding block and slides with the sliding block.

[0009] By adopting the above technical solution, when the spraying assembly sprays the seedling tray, the drive motor works and drives the reciprocating screw to rotate. Since the sliding block is threadedly connected to the reciprocating screw and is restricted by the limit rod, the sliding block reciprocates on the reciprocating screw, thereby causing the sliding block to drive the spraying assembly to spray the seedling tray reciprocally, thus improving the coverage of the seedling tray spraying.

[0010] Furthermore, the spray assembly includes a spray head disposed on a side wall of one side of the sliding block and a spray hose for connecting the spray head to an external liquid supply system.

[0011] By adopting the above technical solution, the external liquid supply system continuously supplies liquid to the spray hose, which is then sprayed out through the spray head. During this process, the drive motor works and causes the spray head to reciprocate with the sliding block, thereby realizing the reciprocating spraying of the seedling tray.

[0012] Furthermore, the U-shaped frame is provided with an auxiliary mechanism to prevent the sprinkler hose from bending during movement. The auxiliary mechanism includes a traction component, which includes an upper sleeve fixedly sleeved on the sprinkler hose, an upper fixing plate fixedly sleeved on the upper sleeve, a lower traction column set on the top of the upper fixing plate, an upper traction column slidably set on the inner top wall of the U-shaped frame, and an upper spring rope connecting the upper traction column and the lower traction column.

[0013] By adopting the above technical solution, during the process of the drive motor working and driving the sliding block to reciprocate, the lower traction column and the spray hose move synchronously with the sliding block. The upper spring rope plays a certain traction role on the spray hose, and the upper traction column connected to the upper spring rope slides in cooperation with the U-shaped frame, which ensures the stability of the spray hose during the movement and reduces the probability of the spray hose bending due to the change of the position of the spray head, thus affecting the normal infusion.

[0014] Furthermore, a support plate is fixed to the inner side of the U-shaped frame, and a through hole for the spray hose to pass through is provided on the side of the U-shaped frame near the support plate. The auxiliary mechanism also includes a guide assembly, which includes guide rods fixed to the support plate. Multiple guide rods are provided and staggered. The guide assembly also includes guide wheels rotatably mounted on the guide rods. The number of guide wheels is equal to the number of guide rods and their positions correspond one-to-one. The support plate and the upper fixed plate are staggered.

[0015] By adopting the above technical solution, multiple staggered guide rods and guide wheels together form a guiding channel. When the spray hose moves with the sliding block, it slides along the guiding channel, ensuring the stability of the spray hose when it adapts to changes in the spray head. At the same time, when the spray hose moves with the sliding block, the guide wheels rotate around the guide rods, reducing friction and wear during the movement of the spray hose.

[0016] Furthermore, a spring-loaded assembly for causing the spray hose to retract and reset is provided on one side of the frame of the U-shaped frame. The spring-loaded assembly includes a placement plate fixed to the U-shaped frame, a lower connecting rod fixed to the top of the placement plate, a lower sleeve fixedly sleeved on the spray hose and located outside the U-shaped frame, a lower fixing plate fixedly sleeved on the lower sleeve, an upper connecting rod fixed to the bottom of the lower fixing plate, and a lower spring rope connecting the upper connecting rod and the lower connecting rod.

[0017] By adopting the above technical solution, when the drive motor drives the sliding block to slide away from the rebound assembly, the spray hose moves synchronously with the sliding block. The lower spring rope adapts to the changes in the position of the spray hose and spray head, ensuring the stability of the spray hose during use and the normal infusion process. Subsequently, when the sliding block slides closer to the rebound assembly, the lower spring rope pulls the spray hose back to its original position through tension, keeping the spray hose taut as the spray head moves with the sliding block, reducing the probability of the spray hose bending and ensuring the normal infusion process.

[0018] Furthermore, the support plate has an inclined surface on the side away from the through hole, and the height of the inclined surface on the side closer to the through hole is greater than the height on the side away from the through hole. A groove is provided on the inclined surface, and multiple transmission rollers are rotatably installed between the inner walls on both sides of the groove.

[0019] By adopting the above technical solution, the setting of the transmission roller reduces the frictional force when the spray hose slides on the support plate, reduces the frictional damage during the movement of the spray hose, and extends its service life.

[0020] Furthermore, the spray hose is wrapped around the spray head and secured with steel wire.

[0021] By adopting the above technical solution, the steel wire ensures the stability of the connection between the spray hose and the spray head.

[0022] Furthermore, the end of the spray hose furthest from the external liquid supply system is connected to a T-connector, and the two free ends of the T-connector are respectively connected to two spray heads.

[0023] By adopting the above technical solution and setting up the three-way pipe, the number of sprinkler heads is increased, thereby improving the coverage of the sprinkler heads on the seedling trays.

[0024] In summary, this utility model has the following beneficial effects: the operator can drive the lower sprocket to rotate using the drive component, and the lower sprocket drives the upper sprocket to rotate through the drive chain, thereby causing the seedling tray to move with the drive chain. The spray component can spray the seedling tray during its low-speed movement. The drive component allows the spray component to move back and forth between the frames on both sides of the machine, so that the spray component can spray different positions of the seedling tray evenly. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the structure of the spraying mechanism used to highlight the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 yes Figure 2 A structural diagram from another perspective; Figure 5 yes Figure 4 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the auxiliary mechanism in Embodiment 1 of this utility model; Figure 7 yes Figure 6 Enlarged view of point C in the middle; Figure 8 This is a schematic diagram of the structure of the three-way pipe in Embodiment 2 of this utility model.

[0026] In the diagram: 1. Frame; 2. Chain conveyor; 21. Upper sprocket; 22. Lower sprocket; 23. Drive chain; 24. Drive component; 3. Seedling tray; 4. Spraying mechanism; 41. Spraying assembly; 411. Spray head; 412. Spray hose; 42. Drive assembly; 421. U-shaped frame; 4211. Support plate; 4212. Through hole; 4213. Fixing strip; 4214. Fixed pulley; 422. Reciprocating screw; 423. Sliding block; 424. Limiting rod; 425. Drive motor; 5. 51. Auxiliary mechanism; 51. Traction assembly; 511. Upper sleeve; 512. Upper fixing plate; 513. Lower traction column; 514. Upper traction column; 515. Upper spring rope; 52. Guide assembly; 521. Guide rod; 522. Guide wheel; 6. Rebound assembly; 61. Placement plate; 611. U-shaped rod; 62. Lower connecting rod; 63. Lower sleeve; 64. Lower fixing plate; 65. Upper connecting rod; 66. Lower spring rope; 7. Inclined surface; 71. Groove; 72. Drive roller; 8. Steel wire; 9. T-shaped pipe. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] Example 1: As Figure 1-7 As shown in the illustration, this application discloses a spraying device for a three-dimensional circulating seedling production line, including a frame 1, a chain conveyor 2, and a spraying mechanism 4. The chain conveyor 2 is disposed on both sides of the frame 1, and includes an upper sprocket 21, a lower sprocket 22, a drive chain 23, and a drive component 24 (such as a motor). The upper sprocket 21 is mounted on the frame 1, and the lower sprocket 22 is mounted on the frame 1, with the axis of the lower sprocket 22 parallel to the axis of the upper sprocket 21. The drive chain 23 meshes with both the upper sprocket 21 and the lower sprocket 22, and the drive component 24 drives the lower sprocket 22 to rotate (the upper sprocket 21, lower sprocket 22, drive chain 23, and drive component 24 are all conventional configurations in the art and will not be described in detail here). In this embodiment, seedling trays 3 are disposed between the drive chains 23 of the two sets of chain conveyors 2, and multiple seedling trays 3 are provided to support the growth of seedlings. The spraying mechanism 4 is located between the frames on both sides of the frame 1, and the spraying mechanism 4 sprays the seedling tray 3. The spraying mechanism 4 includes a drive component 42 and a spraying component 41.

[0029] The drive assembly 42 is used to drive the spray assembly 41 back and forth between the frames on both sides of the frame 1. The drive assembly 42 includes a U-shaped frame 421, a reciprocating screw 422, a sliding block 423, a limiting rod 424, and a drive motor 425. The U-shaped frame 421 is fixed to the frames on both sides of the frame 1 and has an inverted U-shaped structure. The reciprocating screw 422 is rotatably mounted between the frames on both sides of the U-shaped frame 421. The sliding block 423 is slidably disposed on the reciprocating screw 422 and is threadedly connected to the reciprocating screw 422. The limiting rod 424 is fixed between the frames on both sides of the U-shaped frame 421 and is parallel to the reciprocating screw 422. The drive motor 425 is disposed on the side wall of the U-shaped frame 421, and the axis of the output end of the drive motor 425 coincides with the axis of the reciprocating screw 422. In this embodiment, the reciprocating lead screw 422 passes through the U-shaped frame 421 on the side near the drive motor 425 and is fixed to the output end of the drive motor 425, and the limiting rod 424 passes through the sliding block 423 and slides in cooperation with the sliding block 423.

[0030] The spray assembly 41 includes a spray head 411 and a spray hose 412. The spray head 411 is disposed on the side wall of the sliding block 423, and the spray hose 412 is used to connect the spray head 411 to an external liquid supply system (not shown in the figure).

[0031] In this embodiment, an auxiliary mechanism 5 is provided on the U-shaped frame 421 to prevent the sprinkler hose 412 from bending during movement. The auxiliary mechanism 5 includes a traction component 51 and a guide component 52. The traction component 51 includes an upper sleeve 511, an upper fixing plate 512, a lower traction column 513, an upper traction column 514, and an upper spring rope 515. The upper sleeve 511 is fixedly sleeved on the sprinkler hose 412, and the upper fixing plate 512 is fixedly mounted on the upper sleeve 511. The lower traction column 513 is located on the top of the upper fixing plate 512, and the upper traction column 514 is slidably mounted on the inner top wall of the U-shaped frame 421. The upper spring rope 515 connects the upper traction column 514 to the lower traction column 513.

[0032] The operator can use the drive component 24 to drive the lower sprocket 22 to rotate. The lower sprocket 22 drives the upper sprocket 21 to rotate via the drive chain 23, thereby causing the seedling tray 3 to move with the drive chain 23. The external liquid supply system continuously delivers liquid to the spray hose 412, and then sprays the seedling tray 3 through the spray head 411 during its low-speed movement. The drive motor 425 works and drives the reciprocating screw 422 to rotate. Since the sliding block 423 is threadedly connected to the reciprocating screw 422 and is limited by the limit rod 424, the sliding block 423... The reciprocating screw 422 performs reciprocating motion. At the same time, the lower traction column 513 and the spray hose 412 move synchronously with the sliding block 423. The upper spring rope 515 provides a certain traction for the spray hose 412. The upper traction column 514, which is connected to the upper spring rope 515, slides in cooperation with the U-shaped frame 421, ensuring the stability of the spray hose 412 during the movement. This allows the sliding block 423 to drive the spray head 411 to reciprocate between the frames on both sides of the frame 1 to spray the seedling tray 3, thereby improving the coverage of the spray on the seedling tray 3.

[0033] In this embodiment, a spring-loaded assembly 6 is provided on one side of the frame of the U-shaped frame 421. The spring-loaded assembly 6 is used to retract and reset the spray hose 412. The spring-loaded assembly 6 includes a placement plate 61, a lower connecting rod 62, a lower sleeve 63, a lower fixing plate 64, an upper connecting rod 65, and a lower spring rope 66. The placement plate 61 is fixed to the U-shaped frame 421, and the lower connecting rod 62 is fixed to the top of the placement plate 61. The lower sleeve 63 is fixedly sleeved on the spray hose 412 and located outside the U-shaped frame 421, and the lower fixing plate 64 is fixedly sleeved on the lower sleeve 63. The upper connecting rod 65 is fixed to the bottom of the lower fixing plate 64, and the lower spring rope 66 connects the upper connecting rod 65 and the lower connecting rod 62. A U-shaped rod 611 is provided through the placement plate 61, and the U-shaped rod 611 slides with the placement plate 61. The two ends of the transverse section of the U-shaped rod 611 are fixed to the outer wall of the U-shaped frame 421.

[0034] When the drive motor 425 drives the sliding block 423 to slide away from the rebound assembly 6, the spray hose 412 moves synchronously with the sliding block 423. The lower spring rope 66 adapts to the changes in the position of the spray hose 412 and the spray head 411, ensuring the stability of the spray hose 412 during use and the normal infusion process. Subsequently, when the sliding block 423 slides closer to the rebound assembly 6, the lower spring rope 66 pulls the spray hose 412 back to its original position through tension, keeping the spray hose 412 taut as the spray head 411 moves with the sliding block 423, reducing the probability of the spray hose 412 bending and ensuring the normal infusion process.

[0035] The guiding assembly 52 includes guide rods 521 and guide wheels 522. In this embodiment, a support plate 4211 is fixed to the inner side of the U-shaped frame 421, and the support plate 4211 is staggered with the upper fixed plate 512. A through hole 4212 is provided through the side of the U-shaped frame 421 near the support plate 4211, and the through hole 4212 is used for the spray hose 412 to pass through. The guide rods 521 are fixed to the support plate 4211, and multiple guide rods 521 are provided and staggered. The guide wheels 522 are rotatably mounted on the guide rods 521, and the number of guide wheels 522 and guide rods 521 are equal and their positions correspond one-to-one. Two fixing bars 4213 are provided on the side of the U-shaped frame 421 near the drive motor 425, and a fixed pulley 4214 is rotatably mounted between the two fixing bars 4213. The fixed pulley 4214 is used to guide the movement of the spray hose 412.

[0036] Multiple staggered guide rods 521 and guide wheels 522 together form a guide channel. When the spray hose 412 moves with the sliding block 423, the spray hose 412 slides along the guide channel, ensuring the stability of the spray hose 412 when it adapts to changes in the spray head 411. At the same time, when the spray hose 412 moves with the sliding block 423, the guide wheel 522 rotates around the guide rod 521, reducing the friction and wear of the spray hose 412 during movement.

[0037] In this embodiment, an inclined surface 7 is provided on the side of the support plate 4211 away from the through hole 4212, and the height of the inclined surface 7 on the side closer to the through hole 4212 is greater than the height of the side away from the through hole 4212. A groove 71 is provided on the inclined surface 7, and multiple transmission rollers 72 are rotatably mounted between the inner walls on both sides of the groove 71. The provision of the transmission rollers 72 reduces the frictional force when the spray hose 412 slides on the support plate 4211, reduces frictional damage to the spray hose 412 during movement, and extends its service life.

[0038] In this embodiment, the spray hose 412 is wrapped around the spray head 411 and secured with steel wire 8. The steel wire 8 ensures the stability of the connection between the spray hose 412 and the spray head 411.

[0039] Example 2: Figure 8 As shown, the only difference between this embodiment and Embodiment 1 is that the end of the spray hose 412 furthest from the external liquid supply system is connected to a three-way pipe 9, and the two free ends of the three-way pipe 9 are respectively connected to two spray heads 411. The setting of the three-way pipe 9 increases the number of spray heads 411 and improves the coverage of the spray heads 411 on the seedling tray 3.

[0040] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A spraying device for a three-dimensional circulating seedling production line, comprising a frame (1), with chain conveyors (2) on both sides of the frame (1), each chain conveyor (2) comprising an upper sprocket (21) and a lower sprocket (22) mounted on the frame (1), a drive chain (23) meshing with both the upper sprocket (21) and the lower sprocket (22), and a drive component (24) for driving the lower sprocket (22) to rotate, wherein multiple seedling trays (3) are arranged between the drive chains (23) of the two sets of chain conveyors (2), characterized in that: A spraying mechanism (4) for spraying seedling trays (3) is provided between the frames on both sides of the frame (1). The spraying mechanism (4) includes a spraying component (41) and a driving component (42). The driving component (42) is used to drive the spraying component (41) back and forth between the frames on both sides of the frame (1).

2. The spraying device for a three-dimensional circulating seedling production line according to claim 1, characterized in that: The drive assembly (42) includes a U-shaped frame (421) fixed on both sides of the frame (1), a reciprocating screw (422) rotatably installed between the frames on both sides of the U-shaped frame (421), a sliding block (423) slidably disposed on the reciprocating screw (422) and threadedly connected to the reciprocating screw (422), a limiting rod (424) fixed between the frames on both sides of the U-shaped frame (421) and parallel to the reciprocating screw (422), and a drive motor (425) disposed on the side wall of the U-shaped frame (421). The reciprocating screw (422) passes through the side of the U-shaped frame (421) near the drive motor (425) and is fixed to the output end of the drive motor (425). The limiting rod (424) passes through the sliding block (423) and is slidably engaged with the sliding block (423).

3. The spraying device for a three-dimensional circulating seedling production line according to claim 1, characterized in that: The spray assembly (41) includes a spray head (411) disposed on a side wall of a sliding block (423) and a spray hose (412) for connecting the spray head (411) to an external liquid supply system.

4. The spraying device for a three-dimensional circulating seedling production line according to claim 2, characterized in that: The U-shaped frame (421) is provided with an auxiliary mechanism (5) to prevent the spray hose (412) from bending during movement. The auxiliary mechanism (5) includes a traction component (51). The traction component (51) includes an upper sleeve (511) fixedly sleeved on the spray hose (412), an upper fixing plate (512) fixedly sleeved on the upper sleeve (511), a lower traction column (513) set on the top of the upper fixing plate (512), an upper traction column (514) slidably set on the inner top wall of the U-shaped frame (421), and an upper spring rope (515) connected between the upper traction column (514) and the lower traction column (513).

5. The spraying device for a three-dimensional circulating seedling production line according to claim 4, characterized in that: The U-shaped frame (421) has a support plate (4211) fixed on its inner side. The U-shaped frame (421) has a through hole (4212) on the side near the support plate (4211) for the spray hose (412) to pass through. The auxiliary mechanism (5) also includes a guide assembly (52). The guide assembly (52) includes a guide rod (521) fixed on the support plate (4211). There are multiple guide rods (521) and they are staggered. The guide assembly (52) also includes a guide wheel (522) rotatably mounted on the guide rod (521). The number of guide wheels (522) is equal to the number of guide rods (521) and their positions correspond one-to-one. The support plate (4211) and the upper fixed plate (512) are staggered.

6. The spraying device for a three-dimensional circulating seedling production line according to claim 2, characterized in that: A spring assembly (6) for causing the spray hose (412) to retract and reset is provided on one side of the frame of the U-shaped frame (421). The spring assembly (6) includes a placement plate (61) fixed on the U-shaped frame (421), a lower connecting rod (62) fixed on the top of the placement plate (61), a lower sleeve (63) fixedly sleeved on the spray hose (412) and located outside the U-shaped frame (421), a lower fixing plate (64) fixedly sleeved on the lower sleeve (63), an upper connecting rod (65) fixed to the bottom of the lower fixing plate (64), and a lower spring rope (66) connecting the upper connecting rod (65) and the lower connecting rod (62).

7. The spraying device for a three-dimensional circulating seedling production line according to claim 5, characterized in that: The support plate (4211) has an inclined surface (7) on the side away from the through hole (4212). The height of the inclined surface (7) on the side closer to the through hole (4212) is greater than the height of the side away from the through hole (4212). A groove (71) is provided on the inclined surface (7). Multiple transmission rollers (72) are rotatably installed between the inner walls on both sides of the groove (71).

8. The spraying device of a three-dimensional circulating seedling production line according to claim 4, characterized in that: The spray hose (412) is wrapped around the spray head (411) and tied with steel wire (8).

9. The spraying device for a three-dimensional circulating seedling production line according to claim 3, characterized in that: The end of the spray hose (412) away from the external liquid supply system is connected to a three-way pipe (9), and the two free ends of the three-way pipe (9) are respectively connected to two spray heads (411).

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