A buried telescopic sprinkler head

Abstract

This invention belongs to the field of buried sprinkler head technology and discloses a buried telescopic folding sprinkler head, including a first connecting pipe, an adjustment mechanism internally connected to the first connecting pipe, an unfolding mechanism installed at the top of the adjustment mechanism, a guide block rotatably connected to the bottom of the second connecting pipe, a first return spring sleeved on the outside of the second connecting pipe, and a third connecting pipe fixed at the top of the second connecting pipe. The output end of the first connecting pipe is connected to the second connecting pipe, and the output end of the second connecting pipe is connected to the third connecting pipe. This invention, through the cooperation of structures such as a pressure rod, a second return spring, and a baffle, enables the device to automatically unfold and retract the sprinkler assembly. The pressure rod slides with the sprinkler seat, the water flow squeezes the baffle and drives the pressure rod to move downward, and two sets of symmetrical rack and pinion meshing transmission gears drive the sprinkler strip to rotate and unfold. After the water supply stops, the second return spring pushes the pressure rod to reset, causing the sprinkler strip to retract and retract, ultimately achieving the effect of avoiding obstruction of agricultural machinery operations and improving ease of use.

Description

Technical Field

[0001] This invention belongs to the field of buried sprinkler head technology, specifically a buried telescopic folding sprinkler head. Background Technology

[0002] In modern agricultural production, full mechanization has become the core development direction for improving production efficiency and ensuring the yield and quality of agricultural products. Irrigation, as a key field operation throughout the entire planting cycle, directly affects the overall efficiency of agricultural production due to the compatibility of its technical solutions with mechanized operations. Underground sprinkler irrigation technology, with its design advantage of burying pipelines and sprinklers underground, fundamentally solves the problem of traditional open canal irrigation, surface branch pipe irrigation, and exposed sprinkler equipment hindering the passage and operation of large agricultural machinery such as tractors, seeders, and plant protection machines. It achieves zero obstacles on the field surface, allowing agricultural machinery to carry out various operations without restriction. At the same time, it enables irrigation plans to be flexibly adjusted according to agronomic needs and weather changes, achieving a high degree of synergy between agricultural machinery, agronomy, and irrigation management. It is especially suitable for large-scale standardized farms with concentrated and contiguous plots and regular fields, and has become one of the preferred technologies for modern agricultural irrigation.

[0003] However, the existing telescopic underground sprinkler head products on the market all have obvious technical immaturity issues, which seriously restrict the promotion and application of this technology. Existing products generally suffer from technical bottlenecks such as incomplete retraction and jamming. After irrigation is stopped, the sprinkler head cannot retract smoothly underground under the action of gravity, spring or hydraulic force, which can easily lead to mud and sand getting stuck. This results in exposed poles of varying heights in the field, which not only completely negates the core advantage of zero obstacles in underground sprinkler irrigation, but also creates new obstacles for subsequent agricultural machinery operations. Existing products lack a precise control mechanism for the unfolding angle of the sprinkler head. Different sprinkler heads always maintain a consistent spraying distance under the same water pressure conditions, and cannot flexibly adjust the spraying range and coverage density according to the irrigation needs of farmland, further reducing the targetedness and efficiency of irrigation.

[0004] To address the technical issues of existing telescopic buried sprinkler heads, such as retraction jamming, mud and sand jamming, and the contradiction between spraying distance and telescopic adaptability, and to meet the needs of large-scale, standardized, and precise irrigation in modern agriculture, a new type of buried telescopic sprinkler head with folding mechanism is proposed. This head can extend and retract smoothly while ensuring long-distance spraying, thus avoiding obstruction to subsequent agricultural machinery operations. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides a buried telescopic sprinkler head with folding nozzles.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a buried telescopic sprinkler folding nozzle, comprising a first connecting pipe, wherein an adjustment mechanism is movably connected inside the first connecting pipe, and an unfolding mechanism is installed at the top of the adjustment mechanism; The adjustment mechanism includes a second connecting pipe, a guide block, and a first reset spring. The second connecting pipe is slidably connected inside the first connecting pipe. The bottom end of the second connecting pipe is rotatably connected to the guide block. The first reset spring is sleeved on the outside of the second connecting pipe. The top end of the second connecting pipe is fixed with a third connecting pipe. The output end of the first connecting pipe is connected to the second connecting pipe, and the output end of the second connecting pipe is connected to the third connecting pipe. The unfolding mechanism includes a pressure rod, a second return spring, and a baffle plate. The pressure rod is movably connected to the top of the third connecting pipe, the bottom end of the pressure rod is fixed with the second return spring, and the bottom end of the pressure rod is fixed with the baffle plate.

[0007] Preferably, the first connecting pipe has a collar internally connected to it, the collar internally threaded with a screw, and an extension block fixed externally to the first connecting pipe.

[0008] Preferably, the outer wall of the second connector is attached to the inner wall of the first connector, the guide block is spiral-shaped, the top end of the first return spring is fixedly connected to the collar, and the first return spring is used to squeeze the second connector and keep it moving downward.

[0009] Preferably, the outer wall of the collar fits against the inner wall of the first connector, the collar and the first connector are slidably connected, and two sets of screws are provided, the screws being symmetrically distributed about the central axis of the first connector.

[0010] Preferably, four sets of extension blocks are provided, and the extension blocks are symmetrically distributed about the central axis of the first connecting pipe, and the screw and the extension blocks are rotatably connected.

[0011] Preferably, the third connecting pipe has a guide groove, a first guide hole, and a second guide hole inside. A rack is fixed to the outside of the pressure rod. A sprinkler strip is rotatably connected inside the third connecting pipe. A transmission gear is fixed to the outside of the sprinkler strip. A sprinkler head is fixed to the outside of the sprinkler strip. The guide groove, the first guide hole, and the second guide hole in the third connecting pipe form an orderly water flow channel, realizing directional water delivery and diversion. This ensures that the water flow first drives the sprinkler assembly to unfold before being sprayed out through the sprinkler head, avoiding water waste and improving utilization efficiency. The rack and the transmission gear mesh with each other. The movement of the pressure rod drives the sprinkler strip to rotate and unfold through gear transmission. The arrayed sprinkler heads move synchronously with the sprinkler strip, expanding the sprinkler coverage area and ensuring irrigation uniformity.

[0012] Preferably, the outer wall of the pressure rod is attached to the inner wall of the third connecting pipe, the pressure rod and the third connecting pipe are slidably connected, the bottom end of the second return spring is fixedly connected to the third connecting pipe, the second return spring is used to squeeze the pressure rod and keep it moving upward. The outer wall of the pressure rod is attached to and slidably connected to the inner wall of the third connecting pipe, limiting the pressure rod to move only along the axial direction, avoiding deviation that would cause misalignment between the rack and the transmission gear, ensuring that the unfolding and retraction of the sprinkler strip is precise and controllable. The second return spring continuously squeezes the pressure rod and keeps it moving upward. After the water supply is stopped, the pressure rod can be quickly pushed back to its original position, causing the sprinkler strip to retract and be stored, avoiding exposure to agricultural machinery or mud and sand accumulation, and ensuring the buried protection effect of the device.

[0013] Preferably, the input end of the first guide hole is connected to the output end of the third pipe, the output end of the rack is connected to the guide groove, and the interior of the third pipe is provided with a vertical groove for sliding the baffle plate, the height of the top of the vertical groove being lower than the output end of the first guide hole.

[0014] Preferably, the output end of the second guide hole is connected to the second guide hole, and the output end of the second guide hole is connected to the sprinkler strip. The rack is provided in two sets, and the racks are symmetrically distributed about the central axis of the pressure rod.

[0015] Preferably, the outer wall of the rack is fixed with several sets of teeth, the outer wall of the transmission gear is fixed with several sets of teeth, the rack and the transmission gear are meshed and connected, and several sets of spray heads are provided, which are distributed in an array.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the combination of a pressure rod, a second return spring, and a baffle, enables the device to automatically unfold and retract the sprinkler assembly. The pressure rod slides in conjunction with the sprinkler seat, and the water flow squeezes the baffle, causing the pressure rod to move downward. Two sets of symmetrical racks mesh with transmission gears, driving the sprinkler strip to rotate and unfold. After the water supply stops, the second return spring pushes the pressure rod back to its original position, causing the sprinkler strip to retract and retract. Ultimately, this achieves the effect of avoiding obstacles to agricultural machinery operations and improving ease of use.

[0017] This invention, through the combination of a second connecting pipe, a guide block, and a first reset spring, enables the device to smoothly extend and retract and adjust the spray pressure. The second connecting pipe slides along the inner wall of the first connecting pipe, and the spiral guide block converts the water pressure into lift, causing the second connecting pipe to extend upwards. The first reset spring provides a reset force, and after the water supply stops, the second connecting pipe is pulled back underground. By adjusting the spring pressure with a screw, the spray water pressure can be changed, ultimately achieving the effect of smooth extension and retraction without jamming and adapting to different spray distance requirements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall unfolded structure of the present invention; Figure 3 This is a schematic diagram of the overall unfolded cross-sectional structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged cross-sectional view of a portion of point A in the middle section; Figure 5 For the present invention Figure 3 Enlarged cross-sectional view of section B in the middle section; Figure 6 This is a schematic diagram of the overall front cross-sectional structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged cross-sectional view of section C.

[0019] In the diagram: 1. First connecting pipe; 2. Adjusting mechanism; 201. Second connecting pipe; 202. Guide block; 203. First return spring; 204. Collar; 205. Screw; 206. Extension block; 207. Third connecting pipe; 3. Deployment mechanism; 301. Pressure rod; 302. Second return spring; 303. Baffle plate; 304. Guide groove; 305. First guide hole; 306. Second guide hole; 307. Rack; 308. Sprinkler strip; 309. Transmission gear; 310. Sprinkler head. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 7 As shown, the present invention provides a buried telescopic sprinkler folding nozzle, including a first connecting pipe 1, an adjustment mechanism 2 is movably connected inside the first connecting pipe 1, and an unfolding mechanism 3 is installed at the top of the adjustment mechanism 2.

[0022] like Figures 1 to 6As shown, the adjusting mechanism 2 includes a second connecting pipe 201, a guide block 202, and a first return spring 203. The second connecting pipe 201 is slidably connected inside the first connecting pipe 1. The guide block 202 is rotatably connected to the bottom end of the second connecting pipe 201. The first return spring 203 is sleeved on the outside of the second connecting pipe 201. A third connecting pipe 207 is fixed to the top end of the second connecting pipe 201. The output end of the first connecting pipe 1 is connected to the second connecting pipe 201, and the output end of the second connecting pipe 201 is connected to the third connecting pipe 207. A collar 204 is movably connected inside the first connecting pipe 1, and a screw 205 is threadedly connected inside the collar 204. An extension is fixed to the outside of the first connecting pipe 1. Block 206, the outer wall of the second pipe 201 is attached to the inner wall of the first pipe 1, the guide block 202 is spiral, the top end of the first return spring 203 is fixedly connected to the collar 204, the first return spring 203 is used to squeeze the second pipe 201 and keep it moving downward, the outer wall of the collar 204 is attached to the inner wall of the first pipe 1, the collar 204 and the first pipe 1 are slidably connected, two sets of screws 205 are provided, the screws 205 are symmetrically distributed about the central axis of the first pipe 1, four sets of extension blocks 206 are provided, the extension blocks 206 are symmetrically distributed about the central axis of the first pipe 1, the screws 205 and the extension blocks 206 are rotatably connected.

[0023] The above solution involves the following: water enters through the first connector 1 and is conveyed upwards, causing the guide block 202 to rotate and the second connector 201 to move upwards. The first connector 1 has a limiting groove inside, ensuring that the height of the bottom of the second connector 201 does not exceed the height of the sliding groove of the collar 204, thus preventing water leakage. The first return spring 203 provides pressure to the second connector 201, and when the water flow is turned off, it resets the second connector 201, causing it to move downwards and retract into the interior of the first connector 1. The height of the collar 204 can be adjusted by rotating the screw 205, thereby adjusting the height of the top of the first return spring 203 and changing the downward pressure on the second connector 201.

[0024] like Figures 1 to 7As shown, the unfolding mechanism 3 includes a pressure rod 301, a second return spring 302, and a baffle 303. The pressure rod 301 is movably connected to the top of the third connecting pipe 207. The bottom end of the pressure rod 301 is fixed with the second return spring 302 and the baffle 303. The third connecting pipe 207 has a guide groove 304, a first guide hole 305, and a second guide hole 306 inside. A rack 307 is fixed to the outside of the pressure rod 301. A spraying strip 308 is rotatably connected inside the third connecting pipe 207. A transmission gear 309 is fixed to the outside of the spraying strip 308. A spray head 310 is fixed to the outside of the spraying strip 308. The outer wall of the pressure rod 301 fits against the inner wall of the third connecting pipe 207. The pressure rod 301 and the third connecting pipe 207 are slidably connected. The bottom end of the second return spring 302 and the third connecting pipe 207 are connected to the inner wall of the third connecting pipe 207. 07 Fixed connection, the second return spring 302 is used to squeeze the pressure rod 301 and keep it moving upward. The input end of the first guide hole 305 is connected to the output end of the third pipe 207. The output end of the rack 307 is connected to the guide groove 304. The interior of the third pipe 207 is provided with a vertical groove for sliding the baffle 303. The height of the top of the vertical groove is lower than the output end of the first guide hole 305. The output end of the second guide hole 306 is connected to the second guide hole 306. The output end of the second guide hole 306 is connected to the sprinkler strip 308. Two sets of racks 307 are provided. The racks 307 are symmetrically distributed about the central axis of the pressure rod 301. Several sets of teeth are fixed on the outer wall of the rack 307. Several sets of teeth are fixed on the outer wall of the transmission gear 309. The rack 307 and the transmission gear 309 are meshed and connected. Several sets of sprinkler heads 310 are provided. The sprinkler heads 310 are distributed in an array.

[0025] Using the above scheme: Water enters the second pipe 201 under pressure through the guide block 202, then enters the third pipe 207, and is guided by the first guide hole 305 into the guide groove 304. Since the vertical groove of the sliding baffle 303 is lower than the input end of the first guide hole 305, the water squeezes the baffle 303 downward after entering, thereby driving the pressure rod 301 and rack 307 downward. The downward movement of the rack 307 then drives the transmission gear 309 to rotate, causing the sprinkler strip 3... 08 follows the rotation of the transmission gear 309 and unfolds. At this time, the height of the baffle 303 is lower than the input end of the second guide hole 306. Water enters the interior of the sprinkler strip 308 through the second guide hole 306 and is sprayed out through the sprinkler head 310 to irrigate the farmland. When the water supply is turned off, the baffle 303 is no longer squeezed by the water flow. At this time, the restoring force of the second return spring 302 pushes the pressure rod 301, the baffle 303 and the rack 307 upward, thereby driving the sprinkler strip 308 to rotate downward.

[0026] The working principle and usage process of this invention are as follows: First, water enters through the first connecting pipe 1 and is transported upwards. During this upward movement, the guide block 202 rotates, causing the water pressure to decompose into circumferential and axial components, generating a vertically upward lift force that drives the second connecting pipe 201 upwards. The first connecting pipe 1 has a limiting groove inside, ensuring that the height of the bottom of the second connecting pipe 201 does not exceed the height of the sliding groove of the collar 204, thus preventing water leakage. The first return spring 203 provides pressure to the second connecting pipe 201, resetting it and causing it to move downwards when the water flow is shut off. The first connecting pipe 1 is retracted into the interior, and the height of the collar 204 can be adjusted by rotating the screw 205, thereby adjusting the height of the top of the first reset spring 203. This causes a change in the downward pressure on the second connecting pipe 201, which in turn adjusts the height of the second connecting pipe 201 and the guide block 202 under the same water pressure. Different heights of the guide block 202 will also change the rate of water pressurization. When the guide block 202 is at the bottom, the water flow is faster, and when the guide block 202 is at the top, the water flow is slower. This adjusts the water pressure output from the top, and thus adjusts the distance at which the water is sprayed outward from the device.

[0027] Finally, the water, pressurized by the guide block 202, enters the second pipe 201 and then the third pipe 207. Guided by the first guide hole 305, it enters the guide groove 304. Because the vertical groove of the sliding baffle 303 is lower than the input end of the first guide hole 305, the water, upon entering, forces the baffle 303 downwards, causing the pressure rod 301 and rack 307 to move downwards. This downward movement of the rack 307 then drives the transmission gear 309 to rotate, causing the sprinkler strip 308 to rotate with the transmission gear 309, thus spreading... When the water flow is turned on, the height of the baffle 303 is lower than the input end of the second guide hole 306. Water enters the interior of the sprinkler strip 308 through the second guide hole 306 and is sprayed out through the sprinkler head 310 to irrigate the farmland. When the water flow is turned off, the baffle 303 is no longer squeezed by the water flow. At this time, the restoring force of the second return spring 302 pushes the pressure rod 301, the baffle 303 and the rack 307 upward, thereby driving the sprinkler strip 308 to rotate downward, so that the sprinkler strip 308 retracts into the interior of the third connecting pipe 207 to complete the storage.

[0028] The first connector 1 serves as a water inlet channel. Its internal limiting groove restricts the upward movement of the second connector 201, preventing it from detaching from the collar 204 and causing leakage. Four sets of extension blocks 206 are symmetrically fixed to the outside of the first connector 1, providing rotational support for the screws 205. The two sets of symmetrical screws 205 are threadedly connected to the collar 204. Rotating the screws 205 drives the collar 204 to slide along the inner wall of the first connector 1, thereby adjusting the compression of the first return spring 203. The outer wall of the second connector 201 is flush with the first connector. 1. The inner wall slides smoothly to ensure the smoothness of the telescopic movement. The spiral guide block 202 is rotatably connected to the bottom of the second pipe 201. The circumferential component force generated when the water flows impacts drives it to rotate, and the axial component force is converted into lift force to drive the second pipe 201 to move upward. The first return spring 203 is sleeved on the outside of the second pipe 201, and its two ends are fixed to the collar 204 and the second pipe 201 respectively. It always provides a downward return force. After the water is stopped, the second pipe 201 is pulled back underground to avoid being exposed and obstructing the operation of agricultural machinery.

[0029] The third connector 207 is fixed to the top of the second connector 201. The internal guide groove 304, the first guide hole 305, and the second guide hole 306 form a water flow channel to guide and divert the water flow. The pressure rod 301 slides against the inner wall of the third connector 207. The baffle 303 is fixed to the bottom of the pressure rod 301. The height of its sliding vertical groove is lower than the input end of the first guide hole 305, ensuring that the water flow squeezes the baffle 303 before entering the subsequent channel. Two sets of symmetrical racks 307 are fixed to the outside of the pressure rod 301 and mesh with the transmission gear 309 on the sprinkler strip 308. When the pressure rod 301 moves down, it drives the sprinkler strip 308 to rotate and unfold. The array of sprinkler heads 310 achieves large-area uniform irrigation. The second return spring 302 provides an upward return force. After the water stops, it pushes the pressure rod 301 to reset, causing the sprinkler strip 308 to retract and be stored inside the third connector 207, reducing the adhesion of mud and sand and external damage.

[0030] After the sprinkler irrigation operation is completed, the water flow is turned off, the first return spring 203 and the second return spring 302 return to their original positions simultaneously, the second connecting pipe 201 retracts into the first connecting pipe 1, the sprinkler strip 308 is stored in the third connecting pipe 207, and the entire device is completely buried underground. If it is necessary to adjust the spraying distance, the pressure of the first return spring 203 can be changed by rotating the screw 205, thereby adjusting the extension height of the second connecting pipe 201 and the water flow pressure to adapt to different farmland irrigation needs.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A buried telescopic sprinkler head, comprising a first connecting pipe (1), characterized in that: The first connecting pipe (1) is internally connected to an adjustment mechanism (2), and an unfolding mechanism (3) is installed at the top of the adjustment mechanism (2). The adjustment mechanism (2) includes a second pipe (201), a guide block (202) and a first reset spring (203). The second pipe (201) is slidably connected inside the first pipe (1). The bottom end of the second pipe (201) is rotatably connected to the guide block (202). The first reset spring (203) is sleeved on the outside of the second pipe (201). The top end of the second pipe (201) is fixed with a third pipe (207). The output end of the first pipe (1) is connected to the second pipe (201). The output end of the second pipe (201) is connected to the third pipe (207). The unfolding mechanism (3) includes a pressure rod (301), a second return spring (302) and a baffle (303). The pressure rod (301) is movably connected to the top of the third connecting pipe (207). The bottom end of the pressure rod (301) is fixed with the second return spring (302) and the bottom end of the pressure rod (301) is fixed with the baffle (303).

2. The buried telescopic sprinkler head according to claim 1, characterized in that: The first connector (1) is internally connected to a collar (204), and the collar (204) is internally threaded to a screw (205). An extension block (206) is fixed externally to the first connector (1).

3. The buried telescopic sprinkler head according to claim 2, characterized in that: The outer wall of the second connector (201) is attached to the inner wall of the first connector (1), the guide block (202) is spiral, the top end of the first reset spring (203) is fixedly connected to the collar (204), and the first reset spring (203) is used to squeeze the second connector (201) and keep it moving downward.

4. The buried telescopic sprinkler head according to claim 2, characterized in that: The outer wall of the collar (204) is attached to the inner wall of the first connector (1), the collar (204) and the first connector (1) are slidably connected, and two sets of screws (205) are provided, the screws (205) are symmetrically distributed about the central axis of the first connector (1).

5. The buried telescopic sprinkler head according to claim 2, characterized in that: The extension blocks (206) are provided in four groups, and the extension blocks (206) are symmetrically distributed about the central axis of the first connecting pipe (1). The screw (205) and the extension blocks (206) are rotatably connected.

6. The buried telescopic sprinkler head according to claim 1, characterized in that: The third connector (207) has a flow guide groove (304) inside, a first flow guide hole (305) inside, a second flow guide hole (306) inside, a rack (307) fixed to the outside of the pressure rod (301), a sprinkler strip (308) rotatably connected inside the third connector (207), a transmission gear (309) fixed to the outside of the sprinkler strip (308), and a sprinkler head (310) fixed to the outside of the sprinkler strip (308).

7. The buried telescopic sprinkler head according to claim 6, characterized in that: The outer wall of the pressure rod (301) is attached to the inner wall of the third connecting pipe (207). The pressure rod (301) and the third connecting pipe (207) are slidably connected. The bottom end of the second return spring (302) is fixedly connected to the third connecting pipe (207). The second return spring (302) is used to squeeze the pressure rod (301) and keep it moving upward.

8. The buried telescopic sprinkler head according to claim 6, characterized in that: The input end of the first guide hole (305) is connected to the output end of the third pipe (207), the output end of the rack (307) is connected to the guide groove (304), and the interior of the third pipe (207) is provided with a vertical groove for sliding the baffle (303). The height of the top of the vertical groove is lower than the output end of the first guide hole (305).

9. The buried telescopic sprinkler head according to claim 6, characterized in that: The output end of the second guide hole (306) is connected to the second guide hole (306), and the output end of the second guide hole (306) is connected to the sprinkler strip (308). The rack (307) is provided in two sets, and the rack (307) is symmetrically distributed about the central axis of the pressure rod (301).

10. The buried telescopic sprinkler head according to claim 6, characterized in that: The outer wall of the rack (307) is fixed with several sets of teeth, the outer wall of the transmission gear (309) is fixed with several sets of teeth, the rack (307) and the transmission gear (309) are meshed and connected, and the spray head (310) is provided with several sets, and the spray head (310) is distributed in an array.

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