Centering device for improving turning precision

Through the design of positioning components and water supply components, the problem of unstable position of the lens during the turning process is solved, high-precision turning and cleaning effects are achieved, and the processing accuracy and efficiency of the endoscope lens are improved.

CN120287440AInactive Publication Date: 2025-07-11SHANGHAI DENDRITIC PRECISION INSTR CO LTD
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Patent Information

Application Number
CN202510601053.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-12
Publication Date
2025-07-11
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

During the turning process of the existing endoscope lens processing equipment, the rotation rod drives the lens to rotate faster, causing the lens position to shift, affecting the turning accuracy.

Method used

Positioning components include limiting blocks, steel balls, nozzles, connecting rings and pull rods, etc., and the lens is centered and corrected through multiple sets of limiting blocks. The steel balls polish the outer wall of the lens during turning, and the lens is targetedly cleaned with the water supply component.

Benefits of technology

The accuracy of the lens during processing and the working efficiency of the equipment are improved, the lens position is stable during turning, and the surface quality of the lens is improved through cleaning.

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Abstract

The invention discloses a centering device for improving turning precision, and relates to the technical field of turning equipment.The centering device comprises a device shell and a lens body, a rotating rod and a moving rod are oppositely arranged on the inner wall of the device shell, a positioning assembly for centering the lens body is arranged on the outer wall of the rotating rod, and the positioning assembly comprises a limiting block, a connecting ring and a positioning plate; a steel ball is arranged at one end of the limiting block, nozzles are arranged at the two ends of the steel ball, a positioning ring is movably installed on the outer wall of the steel ball, the outer wall of the positioning ring is connected with the outer wall of the limiting block, and a pull rod is movably installed on the outer wall of the connecting ring. Through the arrangement of the positioning assembly, the position of the lens body is effectively limited, the position of the lens body is effectively corrected through the multiple sets of limiting blocks, and then the precision of the lens body in the machining process is improved; and through the equipment of the water supply assembly, water flows out of the nozzles to carry out targeted cleaning on the outer wall of the lens body.
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Description

Technical Field

[0001] The present invention relates to the technical field of turning equipment, and specifically relates to a centering device for improving turning accuracy. Background Art

[0002] Turning equipment is a machine tool used for processes such as chamfering and cutting on rotating workpieces. When processing lenses, a turning machine can be used to cut the required shapes and sizes. For lenses with shapes such as outer circles, inner circles, and chamfers, the turning machine can complete an efficient processing process. Turning equipment is mainly used in fields such as mechanical manufacturing, mold manufacturing, aerospace, the automotive industry, and medical treatment.

[0003] Among them, an endoscope is a detection instrument that integrates traditional optics, ergonomics, precision machinery, mathematics, software, etc. It has an image sensor, an optical lens, a light source for illumination, a mechanical device, etc. It can enter the stomach through the mouth or enter the body through other natural orifices. With the endoscope, lesions that cannot be shown by X-rays can be seen, so it is very useful for doctors. For example, with the help of an endoscope, a doctor can observe ulcers or tumors in the stomach and thus formulate the best treatment plan.

[0004] In existing turning equipment for processing endoscope lenses, the lens to be turned is often placed at one end of the rotating rod inside the equipment, and then the position of the lens between the rotating rod and the moving rod is limited by moving the moving rod at the other end inside the equipment. However, during the process of machining the outer circle of the lens, since the rotating rod drives the lens to rotate relatively fast and the lens is cut and cleaned, the position of the lens may be displaced, affecting the turning accuracy of the lens. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a centering device for improving turning accuracy to solve the technical problems.

[0006] To achieve the above object, the present invention provides the following technical solution: A centering device for improving turning accuracy, including a device housing and a lens body. Oppositely arranged on the inner wall of the device housing are a rotating rod and a moving rod, and a positioning component for centering the lens body is provided on the outer wall of the rotating rod. The positioning component includes a limiting block, a connecting ring, and a positioning plate. A steel ball is provided at one end of the limiting block, and spray nozzles are arranged at both ends of the steel ball. A positioning ring is movably installed on the outer wall of the steel ball, and the outer wall of the positioning ring is connected to the outer wall of the limiting block. A pull rod is movably installed on the outer wall of the connecting ring, and a bevel gear set is provided at one end of the pull rod. A positioning rod is provided at the other end of the bevel gear set, and one end of the positioning rod is sleeved on the outer wall of the moving rod. A water supply component is also provided at one end of the positioning component.

[0007] By adopting the above technical solutions, through the setting of the positioning component, the position of the lens body is effectively limited, and multiple groups of limit blocks effectively correct the position of the lens body, so that the lens body is located at the center position of one end of the rotating rod, thereby improving the accuracy of the lens body during the processing. Secondly, the setting of the steel ball at one end of the limit block polishes the outer wall of the lens body again while the turning component in the equipment turns the lens body, effectively improving the working efficiency of the equipment; through the equipment of the water supply component, when the rotating rod drives the lens body to rotate and turn, the end of the rotating rod far from the lens body drives the impeller to rotate through the belt and the rotating shaft, so that the water in the filter box flows into the nozzle from the water inlet pipe, the water tank and the water outlet pipe in sequence, and the water flows out of the nozzle to clean the outer wall of the lens body specifically.

[0008] Further, a cavity is provided inside the limit block, a spring is installed in the cavity, and an extrusion block is provided at one end of the spring close to the steel ball. One end of the extrusion block close to the steel ball is arc-shaped and fits the outer wall of the steel ball, and the extrusion block is movably sleeved inside the limit block.

[0009] By adopting the above technical solutions, the setting of the spring and the extrusion block effectively limits the position of the steel ball and improves the stability of the steel ball during rotation.

[0010] Further, a sliding groove is provided at the bottom of the limit block, a sliding block is provided on the outer wall of the positioning plate, and a spring is provided at one end of the sliding block. The sliding block and the spring are located in the sliding groove. The positioning plate is movably connected to the limit block, and one end of the limit block far from the steel ball fits the inner wall of the connecting ring.

[0011] By adopting the above technical solutions, the setting of the sliding block and the spring facilitates the limit block to move backward when the connecting ring rotates in the reverse direction to release the limit on the lens body.

[0012] Further, a bearing is provided between the positioning rod and the moving rod, a tooth is provided at the other end of the positioning rod, and a spur gear is provided at the lower end of the positioning rod. The end of the positioning rod with the tooth meshes with the spur gear.

[0013] By adopting the above technical solutions, the movement of the positioning rod is driven, and then the spur gear rotates, which facilitates the rotation of the connecting ring and effectively reduces the manufacturing cost of the equipment.

[0014] Further, a bevel gear set is provided at one end of the spur gear, a rotating block is provided at the other end of the bevel gear set, and a pull rod is movably installed at one end of the rotating block. The other end of the pull rod is movably connected to the outer wall of the connecting ring.

[0015] By adopting the above technical solution, the connecting ring is effectively pulled, so that multiple limit blocks move towards one end of the lens body, improving the synchronization of the movement of the limit blocks.

[0016] Further, a fixed block is provided at one end of the bevel gear set, and the fixed block is movably connected to the bevel gear set through a bearing and a rotating shaft, and the rotating shaft at one end of the bevel gear set is fixedly connected to a rotating block.

[0017] By adopting the above technical solution, two rotating shafts are sleeved on the inner wall of the rotating block, and one of the rotating shafts is movably connected to a pull rod. Thus, the rotation of the bevel gear set drives the rotation of the rotating block, causing the pull rod to pull the connecting ring to rotate.

[0018] Further, a filter box is provided at the lower end of the fixed block, and there are two filter boxes. A water inlet pipe is provided at the top of the filter box, and a water tank is provided at the top of the water inlet pipe. An impeller is installed on the inner wall of the water tank, and a rotating shaft is provided at one end of the impeller, and the rotating shaft is connected to the outer wall of a rotating rod through a belt.

[0019] By adopting the above technical solution, the rotation of the impeller is driven by the belt, so that the water in the filter box flows into the nozzle through the water outlet pipe and the water inlet pipe, facilitating the nozzle to spray water on the lens body specifically.

[0020] Further, a bottom plate is provided at the lower end of the positioning assembly, and a groove is provided on the inner wall of the bottom plate, and the water pipe in the groove is connected to the filter box.

[0021] By adopting the above technical solution, through the secondary filtration in the filter box, the filtered water quality flows into the water inlet pipe. Secondly, there are two filter boxes. One is the filter box for storing the filtered water, and the other is the filter box for filtering the water quality. The filter box for filtering the water quality is connected to the water pipe.

[0022] Further, a water outlet pipe is provided at the top of the water tank, and a connecting block is provided at the other end of the water outlet pipe, and multiple support rods are provided at one end of the connecting block. A hose communicating with the nozzle is provided on the inner wall of the support rod, and a flip cover is movably installed on the inner wall of the water inlet pipe.

[0023] By adopting the above technical solution, one end of the hose is located at the connecting block, and the other end of the hose is connected to the nozzle. Secondly, the flip cover is movably installed in the water inlet pipe through a rotating shaft, effectively enhancing the water pressure.

[0024] In summary, the present invention mainly has the following beneficial effects: 1. Through the setting of the positioning component, the position of the lens body is effectively limited, and multiple groups of limiting blocks effectively correct the position of the lens body, so that the lens body is located at the central position of one end of the rotating rod, thereby improving the accuracy of the lens body during the processing. Secondly, the setting of the steel ball at one end of the limiting block polishes the outer wall of the lens body again while the turning component in the equipment turns the lens body, effectively improving the working efficiency of the equipment; 2. Through the equipment of the water supply component, when the rotating rod drives the lens body to rotate and turn, the end of the rotating rod far from the lens body drives the impeller to rotate through the belt and the rotating shaft, so that the water in the filter box flows into the nozzle from the water inlet pipe, the water tank and the water outlet pipe in sequence, and the water flows out of the nozzle to clean the outer wall of the lens body specifically. Brief Description of the Drawings

[0025] Figure 1 is the side three-dimensional schematic diagram of the present invention; Figure 2 is the position schematic diagram of the positioning component of the present invention; Figure 3 is the schematic diagram of the bottom plate structure of the present invention; Figure 4 is the schematic diagram of the structure of the positioning component of the present invention; Figure 5 is the position schematic diagram of the positioning rod of the present invention; Figure 6 is the inner wall sectional view of the limiting block of the present invention; Figure 7 is the schematic diagram of the structure of the water supply component of the present invention; Figure 8 is the sectional schematic diagram of the water tank and the water inlet pipe of the present invention.

[0026] In the figure: 1. Device housing; 10. Bottom plate; 11. Groove; 2. Rotating rod; 3. Lens body; 4. Moving rod; 5. Positioning component; 50. Limiting block; 501. Extrusion block; 502. Steel ball; 503. Positioning ring; 504. Nozzle; 51. Connecting ring; 52. Positioning plate; 6. Water supply component; 60. Support rod; 61. Connecting block; 62. Water outlet pipe; 63. Water tank; 64. Water inlet pipe; 644. Flap; 7. Positioning rod; 70. Straight gear; 71. Bevel gear set; 72. Rotating block; 73. Pull rod; 8. Filter box; 80. Fixed block. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0028] The embodiments of the present invention will be described below according to its overall structure.

[0029] A centering device for improving turning accuracy, as shown in Figures 1-8, includes a device housing 1 and a lens body 3. Rotating rods 2 and moving rods 4 are oppositely arranged on the inner wall of the device housing 1. A positioning component 5 for centering the lens body 3 is provided on the outer wall of the rotating rod 2. The positioning component 5 includes a limiting block 50, a connecting ring 51, and a positioning plate 52. A steel ball 502 is provided at one end of the limiting block 50, and spray nozzles 504 are arranged at both ends of the steel ball 502. A positioning ring 503 is movably installed on the outer wall of the steel ball 502, and the outer wall of the positioning ring 503 is connected to the outer wall of the limiting block 50. A pull rod 73 is movably installed on the outer wall of the connecting ring 51, and a bevel gear set 71 is provided at one end of the pull rod 73. A positioning rod 7 is provided at the other end of the bevel gear set 71, and one end of the positioning rod 7 is sleeved on the outer wall of the moving rod 4. A water supply component 6 is also provided at one end of the positioning component 5. Through the setting of the positioning component 5, the position of the lens body 3 is effectively limited, and multiple limiting blocks 50 effectively correct the position of the lens body 3, so that the lens body 3 is located at the center position of one end of the rotating rod 2, thereby improving the accuracy of the lens body 3 during the processing. Secondly, the setting of the steel ball 502 at one end of the limiting block 50 polishes the outer wall of the lens body 3 again while the turning component in the device turns the lens body 3, effectively improving the working efficiency of the device; through the device of the water supply component 6, when the rotating rod 2 drives the lens body 3 to rotate and turn, the end of the rotating rod 2 away from the lens body 3 drives the impeller to rotate through a belt and a rotating shaft, so that the water in the filter tank 8 flows into the spray nozzles 504 in sequence from the water inlet pipe 64, the water tank 63, and the water outlet pipe 62, and the water flows out of the spray nozzles 504 to clean the outer wall of the lens body 3 specifically.

[0030] Please refer to Figure 6 , a cavity is provided inside the limiting block 50, and a spring is installed in the cavity. An extrusion block 501 is provided at one end of the spring close to the steel ball 502. The end of the extrusion block 501 close to the steel ball 502 is arc-shaped and fits the outer wall of the steel ball 502. The extrusion block 501 is movably sleeved inside the limiting block 50. The setting of the spring and the extrusion block 501 effectively limits the position of the steel ball 502 and improves the stability of the steel ball 502 during rotation.

[0031] Please refer to Figures 3 - 5, a chute is provided at the bottom of the limiting block 50, a slider is provided on the outer wall of the positioning plate 52, and a spring is provided at one end of the slider. The slider and the spring are located in the chute. The positioning plate 52 is movably connected to the limiting block 50, and one end of the limiting block 50 away from the steel ball 502 is in contact with the inner wall of the connecting ring 51. The settings of the slider and the spring facilitate the backward movement of the limiting block 50 when the connecting ring 51 rotates in the reverse direction, and release the limit on the lens body 3.

[0032] Please refer to Figures 3 - 5 , a bearing is provided between the positioning rod 7 and the moving rod 4, a tooth is provided at the other end of the positioning rod 7, and a spur gear 70 is provided at the lower end of the positioning rod 7. The end of the positioning rod 7 with teeth meshes with the spur gear 70. Through the rotational force of the moving rod 4, the movement of the positioning rod 7 is driven, and then the spur gear 70 rotates, facilitating the rotation of the connecting ring 51, and effectively reducing the equipment manufacturing cost.

[0033] Please refer to Figures 3 - 5 , a bevel gear set 71 is provided at one end of the spur gear 70, a rotating block 72 is provided at the other end of the bevel gear set 71, and a pull rod 73 is movably installed at one end of the rotating block 72. The other end of the pull rod 73 is movably connected to the outer wall of the connecting ring 51. The spur gear 70 drives the bevel gear set 71 to rotate, the rotating block 72 rotates, and then the movement of the pull rod 73 is driven, effectively pulling the connecting ring 51, and then moving a plurality of limiting blocks 50 towards one end of the lens body 3, improving the synchronization of the movement of the limiting blocks 50.

[0034] Please refer to Figure 3 , Figure 4 , a fixing block 80 is provided at one end of the bevel gear set 71. The fixing block 80 is movably connected to the bevel gear set 71 through a bearing and a rotating shaft, and the rotating shaft at one end of the bevel gear set 71 is fixedly connected to the rotating block 72. The fixing block 80 is movably connected to the bevel gear set 71, and the bevel gear set 71 is fixedly connected to the rotating block 72. Two rotating shafts are sleeved on the inner wall of the rotating block 72, and one of the rotating shafts is movably connected to the pull rod 73. Then, the rotation of the bevel gear set 71 drives the rotating block 72 to rotate, and the pull rod 73 pulls the connecting ring 51 to rotate.

[0035] Please refer to Figure 3 , Figure 4 and Figure 5 , Figure 7, a filter box 8 is provided at the lower end of the fixed block 80, and there are two groups of filter boxes 8. A water inlet pipe 64 is provided at the top of the filter box 8, and a water tank 63 is provided at the top of the water inlet pipe 64. An impeller is installed on the inner wall of the water tank 63, and a rotating shaft is provided at one end of the impeller. The rotating shaft is connected to the outer wall of the rotating rod 2 through a belt. While the rotating rod 2 rotates to turn the lens body 3, the rotation of the impeller is driven by the belt, so that the water in the filter box 8 flows into the spray head 504 through the water outlet pipe 62 and the water inlet pipe 64, facilitating the targeted spraying of the lens body 3 by the spray head 504.

[0036] Please refer to Figure 3 , Figure 7 , a bottom plate 10 is provided at the lower end of the positioning assembly 5, and a groove 11 is provided on the inner wall of the bottom plate 10. The water pipe in the groove 11 is connected to the filter box 8. The water in the device housing 1 falls onto the top of the bottom plate 10 and flows back into the filter box 8 through the groove 11 and the water pipe. Through the re - filtration in the filter box 8, the filtered water quality flows into the water inlet pipe 64. Secondly, there are two groups of filter boxes 8. One group is the filter box 8 for storing the filtered water, and the other group is the filter box 8 for filtering the water quality. The filter box 8 for filtering the water quality is connected to the water pipe.

[0037] Please refer to Figures 3 - 8 , a water outlet pipe 62 is provided at the top of the water tank 63, and a connecting block 61 is provided at the other end of the water outlet pipe 62. A plurality of support rods 60 are provided at one end of the connecting block 61. A hose communicating with the spray head 504 is provided on the inner wall of the support rod 60. A flip cover 644 is movably installed on the inner wall of the water inlet pipe 64. One end of the hose is located at the connecting block 61, and the other end of the hose is connected to the spray head 504. Secondly, the flip cover 644 is movably installed in the water inlet pipe 64 through a rotating shaft, effectively enhancing the water pressure.

[0038] The working principle of the present invention is: When the lens body 3 needs to be turned, first, an adsorption block is installed on the outer wall of the lens body 3, and then the other end of the adsorption block is placed on one end of the rotating rod 2. Secondly, the device button is started, so that the moving rod 4 moves towards one end of the lens body 3, and one end of the moving rod 4 fits against the outer wall of the lens body 3 to limit the position of the lens body 3. At the same time, during the movement of the moving rod 4, the outer wall of the moving rod 4 is sleeved on the positioning rod 7 and follows the moving rod 4 to move. One end of the positioning rod 7 is provided with teeth, and the teeth are engaged with the spur gear 70, so that the movement of the positioning rod 7 drives the rotation of the spur gear 70. And one end of the spur gear 70 is provided with a bevel gear set 71 through a rotating shaft, the bevel gear set 71 drives the rotating block 72 to rotate, and the pull rod 73 drives the connecting ring 51 to rotate, so that multiple limiting blocks 50 move on the outer wall of the positioning plate 52, and further the steel balls 502 fit against the outer wall of the lens body 3 to correct the position of the lens body 3. Finally, the turning component of the device is started to turn the outer wall of the lens body 3; Further, while the rotating rod 2 drives the lens body 3 to rotate and turn, the positioning assembly 5 is sleeved on the outer wall of the rotating rod 2, and one end of the positioning assembly 5 is provided with a support rod 60, so that the positioning assembly 5 will not rotate when the rotating rod 2 rotates. Secondly, a hose communicating with the nozzle 504 is arranged inside the connecting block 61. A belt is arranged at one end of the rotating rod 2 away from the lens body 3. One end of the belt is sleeved on a rotating shaft, and an impeller is arranged at one end of the rotating shaft. The impeller is located inside the water tank 63. And the upper and lower ends of the water tank 63 are respectively provided with a water outlet pipe 62 and a water inlet pipe 64. The bottom of the water inlet pipe 64 is connected to the filter tank 8. Therefore, the rotation of the rotating rod 2 drives the rotation of the impeller, so that the water in the filter tank 8 flows into the nozzle 504 through the water inlet pipe 64, the water tank 63, the water outlet pipe 62 and the connecting block 61, and the flowing water flows out from one end of the nozzle 504 to clean the outer wall of the lens body 3.

[0039] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and not limitations to the invention. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions and variations without creative contributions to the embodiments according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A centering device for improving turning accuracy, comprising a device housing (1) and a lens body (3), characterized in that: On the opposite inner walls of the device housing (1), there are rotating rods (2) and moving rods (4). On the outer wall of the rotating rod (2), there is a positioning assembly (5) for centering the lens body (3). The positioning assembly (5) includes a limiting block (50), a connecting ring (51), and a positioning plate (52). At one end of the limiting block (50), there is a steel ball (502), and at both ends of the steel ball (502), there are spray nozzles (504). A positioning ring (503) is movably installed on the outer wall of the steel ball (502), and the outer wall of the positioning ring (503) is connected to the outer wall of the limiting block (50). A pull rod (73) is movably installed on the outer wall of the connecting ring (51), and at one end of the pull rod (73), there is a bevel gear set (71). At the other end of the bevel gear set (71), there is a positioning rod (7), and one end of the positioning rod (7) is sleeved on the outer wall of the moving rod (4). At one end of the positioning assembly (5), there is also a water supply assembly (6).

2. The centering device for improving turning accuracy according to claim 1, wherein: Inside the limiting block (50), there is a cavity. Inside the cavity, there is a spring. At the end of the spring close to the steel ball (502), there is a pressing block (501). The end of the pressing block (501) close to the steel ball (502) is arc-shaped and fits the outer wall of the steel ball (502). The pressing block (501) is movably sleeved inside the limiting block (50).

3. The centering device for improving turning accuracy according to claim 1, characterized in that: At the bottom of the limiting block (50), there is a chute. On the outer wall of the positioning plate (52), there is a slider. At one end of the slider, there is a spring. The slider and the spring are located inside the chute. The positioning plate (52) is movably connected to the limiting block (50), and the end of the limiting block (50) away from the steel ball (502) fits the inner wall of the connecting ring (51).

4. A centering device for improving turning accuracy according to claim 1, characterized in that: Between the positioning rod (7) and the moving rod (4), there is a bearing. At the other end of the positioning rod (7), there are teeth. At the lower end of the positioning rod (7), there is a spur gear (70). The end of the positioning rod (7) with teeth meshes with the spur gear (70).

5. The centering device for improving turning accuracy according to claim 4, characterized in that: At one end of the spur gear (70), there is a bevel gear set (71). At the other end of the bevel gear set (71), there is a rotating block (72). At one end of the rotating block (72), there is a pull rod (73) movably installed. The other end of the pull rod (73) is movably connected to the outer wall of the connecting ring (51).

6. The centering device for improving turning accuracy according to claim 5, characterized in that: At one end of the bevel gear set (71), there is a fixed block (80). The fixed block (80) is movably connected to the bevel gear set (71) through a bearing and a rotating shaft. The rotating shaft at one end of the bevel gear set (71) is fixedly connected to the rotating block (72).

7. A centering device for improving turning accuracy according to claim 6, characterized in that: At the lower end of the fixed block (80), there is a filter box (8). There are two groups of filter boxes (8). At the top of the filter box (8), there is a water inlet pipe (64). At the top of the water inlet pipe (64), there is a water tank (63). Inside the inner wall of the water tank (63), there is an impeller. At one end of the impeller, there is a rotating shaft. The rotating shaft is connected to the outer wall of the rotating rod (2) through a belt.

8. A centering device for improving turning accuracy according to claim 1, characterized in that: A bottom plate (10) is provided at the lower end of the positioning component (5), a groove (11) is provided on the inner wall of the bottom plate (10), and the drain pipe of the groove (11) is connected to the filter tank (8).

9. A centering device for improving turning accuracy according to claim 7, characterized in that: A water outlet pipe (62) is provided at the top of the water tank (63), a connecting block (61) is provided at the other end of the water outlet pipe (62), and a plurality of support rods (60) are provided at one end of the connecting block (61). A hose communicating with the spray head (504) is provided on the inner wall of the support rod (60), and a flip cover (644) is movably installed on the inner wall of the water inlet pipe (64).