Automatic forming device for machining cross recess

Abstract

The invention relates to the technical field of cross recess machining, in particular to an automatic forming device for machining a cross recess, which comprises a base, a machining mechanism is arranged on the base, and a circulating mechanism is further arranged on one side of the base. A connecting plate is further arranged on one side of the base, a first motor is arranged in the connecting plate, the machining mechanism comprises a push rod arranged at the output end of the first motor, a clamping sleeve is arranged on one side of the push rod, two sets of first fixing columns are arranged on the clamping sleeve, and second fixing columns are arranged on one sides of the two sets of first fixing columns. And an extrusion block is arranged in the second fixing column, and one end of the extrusion block communicates with the air supply column. When secondary machining is carried out, water sprayed out of the spray head is used for flushing impurities in a linear groove machined in a raw material, so that the precision of secondary machining is prevented from being affected, and the machining efficiency is improved. Meanwhile, the influence of excessive impurities in the groove on the cutting knife is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of cross-slot processing, and specifically to an automatic forming device for processing cross-slots. Background Art

[0002] In the assembly of various mechanical equipment, fasteners such as cross-slot screws and bolts are widely used to connect different components to ensure the structural stability of the equipment. In the early days, cross-slot fasteners were mainly made of ordinary carbon steel materials. With the progress of technology and the improvement of application requirements, materials such as stainless steel, alloy steel, and titanium alloy have gradually been widely used. Traditional manufacturing processes include forging, stamping, cutting, etc. Modern manufacturing technology is developing towards automation and precision. Automated production lines have achieved efficient production from raw materials to finished products, improving production efficiency and the stability of product quality.

[0003] In the existing cross-slot processing device, when processing the cross-slot, due to the narrow interior of the processed slot, impurities generated during processing are easily retained inside the groove. At the same time, the remaining grooves are difficult to clean and can easily affect the processing, seriously affecting the service life of the cutting blade and the processing quality of the cross-slot. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic forming device for processing cross-slots. When processing for the second time, the water sprayed from the nozzle flushes the impurities inside the first-type groove processed on the raw material, avoiding affecting the precision of the second processing and at the same time avoiding excessive impurities inside the groove from affecting the cutting tool.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An automatic forming device for processing cross-slots, including a base, a processing mechanism is arranged on the base, and a circulation mechanism is also arranged on one side of the base. A connecting plate is also arranged on one side of the base, and a first motor is arranged inside the connecting plate;

[0006] The processing mechanism includes a push rod arranged at the output end of the first motor. A clamping sleeve is arranged on one side of the push rod. Two groups of first fixing columns are arranged on the clamping sleeve. Second fixing columns are arranged on one side of each of the two groups of first fixing columns. An extrusion block is arranged inside the second fixing column. One end of the extrusion block is communicated with an air supply column. A connecting sleeve is arranged outside the clamping sleeve. A push rod is arranged at one end of the connecting sleeve. A water storage bucket is arranged at one end of the push rod. A second motor is arranged inside the base. A cutting tool is arranged at one end of the second motor. A second fixing plate is arranged above the cutting tool. Second piston columns are respectively arranged on both sides of the second fixing plate. First piston columns are also arranged on both sides of the cutting tool;

[0007] The circulating mechanism includes a water tank arranged at the upper end of the second fixing plate. One side of the water tank is provided with a first water pipe, and one side of the first water pipe penetrates through the base and is connected to a water return groove. A filter box is arranged at the upper end of the water return groove. Two groups of second water pipes are also connected to the bottom of the water tank. One end of the second water pipe communicates with a water storage bucket. One end of the water storage bucket is provided with a connecting pipe, and one end of the connecting pipe is connected to a water spraying pipe.

[0008] Preferably, a rotating circle is arranged inside the connecting plate. A limiting rod is arranged on one side of the rotating circle. A limiting groove is also arranged on the connecting plate. A first groove is arranged inside the limiting groove, and the size of the first groove is adapted to the limiting rod.

[0009] Preferably, a spring is arranged inside the second fixing column. One end of the spring is connected to the extrusion block. The size of the air delivery column is adapted to the first piston column and the second piston column.

[0010] Preferably, two groups of connecting rods are arranged on both sides of the connecting sleeve. Shells are arranged on one side of each of the two groups of connecting rods. The connecting rods are slidably connected to the shells, and first sliding rails are arranged on the shells.

[0011] Preferably, a push block is arranged at one end of the push rod, and the size of the push block is adapted to the water storage bucket.

[0012] Preferably, a rotating shaft is arranged at the output end of the second motor. The rotating shaft penetrates through the first fixing plate and the second fixing plate. A first piston column is arranged on the first fixing plate, and a first piston column is correspondingly arranged on the second fixing plate.

[0013] Preferably, a first hole is arranged at the bottom of the filter box. A second groove is arranged inside the base, and the size is adapted to the filter box.

[0014] Preferably, a one-way valve is arranged on the second water pipe. A pressure valve is arranged inside the connecting pipe. A nozzle is arranged at one end of the water spraying pipe, and a second hole is arranged on the nozzle.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. When the present invention is used for the second processing, the water sprayed from the nozzle flushes the impurities inside the first-shaped groove processed on the raw material, avoiding affecting the precision of the second processing, and at the same time avoiding excessive impurities inside the groove from affecting the cutting tool.

[0017] 2. In the present invention, the water ejected from the nozzle enters the inside of the filter box through the second groove inside the base, and the cutting impurities in the water are filtered through the first holes on the filter box and collected, facilitating subsequent utilization. Meanwhile, the filtered water enters the water return groove through the first holes, and then enters the water tank through the first water pipe for repeated utilization, reducing the waste of water resources.

[0018] 3. In the present invention, the gas inside the air delivery column is discharged into the second fixed column through the first piston column, and at the same time, the extrusion block is extruded, driving the extrusion block to perform secondary fixation on the raw material, avoiding the influence of the excessive length of the raw material on the fixation of the raw material by the device, thereby affecting the processing quality of the cross groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a schematic diagram of a part of the structure of the present invention, one of them;

[0021] Figure 3 is a schematic diagram of a part of the structure of the present invention, two of them;

[0022] Figure 4 is a schematic diagram of a part of the structure of the present invention, three of them;

[0023] Figure 5 is a schematic diagram of a part of the processing mechanism structure of the present invention;

[0024] Figure 6 is of the present invention Figure 5 enlarged view of part A;

[0025] Figure 7 is a schematic diagram of a part of the circulation mechanism structure of the present invention.

[0026] In the figure: 1. Base; 11. Connecting plate; 12. Rotating circle; 121. Restricting rod; 122. First motor; 123. Restricting groove; 2. Processing mechanism; 21. Push rod; 211. Outer shell; 22. Connecting sleeve; 221. Connecting rod; 222. Clamping sleeve; 23. Pushing rod; 231. Pushing block; 24. Water storage bucket; 25. First fixed column; 251. Second fixed column; 252. Spring; 253. Extrusion block; 26. Cutting knife; 261. Rotating shaft; 262. Second motor; 263. First fixing plate; 264. Second fixing plate; 265. First piston column; 266. Second piston column; 27. Air delivery column; 3. Circulation mechanism; 31. Water tank; 311. First water pipe; 312. Second water pipe; 32. Connecting pipe; 33. Spraying water pipe; 331. Nozzle; 34. Water return groove; 341. Filter box. DETAILED DESCRIPTION OF THE INVENTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0028] The present invention provides an automatic forming device for processing cross grooves, including a base 1, a processing mechanism 2 is arranged on the base 1, and a circulation mechanism 3 is also arranged on one side of the base 1. A connecting plate 11 is also arranged on one side of the base 1, and a first motor 122 is arranged inside the connecting plate 11;

[0029] The processing mechanism 2 includes a push rod 21 arranged at the output end of the first motor 122. A clamping sleeve 222 is arranged on one side of the push rod 21. Two groups of first fixing columns 25 are arranged on the clamping sleeve 222. Second fixing columns 251 are arranged on one side of the two groups of first fixing columns 25. An extrusion block 253 is arranged inside the second fixing column 251. One end of the extrusion block 253 is communicated with an air supply column 27. A connecting sleeve 22 is arranged outside the clamping sleeve 222. A push rod 23 is arranged at one end of the connecting sleeve 22. A water storage bucket 24 is arranged at one end of the push rod 23. A second motor 262 is arranged inside the base 1. A cutting knife 26 is arranged at one end of the second motor 262. A second fixing plate 264 is arranged above the cutting knife 26. Second piston columns 266 are respectively arranged on both sides of the second fixing plate 264. First piston columns 265 are also arranged on both sides of the cutting knife 26;

[0030] The circulation mechanism 3 includes a water tank 31 arranged above the second fixing plate 264. A first water pipe 311 is arranged on one side of the water tank 31. One side of the first water pipe 311 penetrates through the base 1 and is connected to a water return groove 34. A filter box 341 is arranged above the water return groove 34. Two groups of second water pipes 312 are also connected to the bottom of the water tank 31. One end of the second water pipe 312 is communicated with the water storage bucket 24. A communicating pipe 32 is arranged at one end of the water storage bucket 24. A water spraying pipe 33 is connected to one end of the communicating pipe 32.

[0031] Before using this device, drive the push rod 21 to contract to one end by the first motor 122, place the raw material to be processed inside the connecting sleeve 22, and pre-fix the raw material by the first fixing column 25. After the fixing is completed, drive the push rod 21 to expand and contract by the first motor 122, thereby driving the clamping sleeve 222 to move. Drive the rotating shaft 261 to rotate by the second motor 262, thereby driving the cutting knife 26 to rotate to process the raw material fixed on the clamping sleeve 222. First, process a first-type groove. After the processing is completed, drive the first motor 122 to drive the push rod 21 to contract. At the same time, rotate the rotating circle 12 so that the limiting rod 121 contacts and presses against another set of limiting grooves 123, driving the first motor 122 to rotate. Then, drive the first motor 122 to expand and contract again, driving the push rod 21 to move, thereby driving the raw material on the clamping sleeve 222 to move, and process a cross groove. At the same time, the expansion and contraction of the push rod 21 drives the clamping sleeve 222 to move, and the movement of the clamping sleeve 222 drives the connecting sleeve 22 to move. The movement of the connecting sleeve 22 squeezes the push rod 23, so that the liquid inside the water storage bucket 24 enters the water spray pipe 33 through the connecting pipe 32. When the extrusion reaches a certain degree, the liquid in the water spray pipe 33 is sprayed out through the nozzle 331 to wash the raw material being processed, and at the same time cool the cutting knife 26 to prevent damage to the cutting knife 26 caused by long-term work. At the same time, when processing for the second time, the water sprayed out from the nozzle 331 washes the impurities inside the first-type groove processed on the raw material, avoiding affecting the precision of the second processing, and at the same time avoiding too many impurities inside the groove affecting the cutting knife 26.

[0032] At the same time, the water sprayed out from the nozzle 331 enters the filter box 341 through the second groove inside the base 1, filters the cutting impurities in the water through the first hole on the filter box 341, and collects them for convenient subsequent use. At the same time, the filtered water enters the water return groove 34 through the first hole, and then enters the water tank 31 through the first water pipe 311 for repeated use, reducing the waste of water resources.

[0033] At the same time, during the first processing, the movement of the clamping sleeve 222 drives the air supply column 27 to move. The movement of the air supply column 27 contacts the first piston column 265 at one end. The first piston column 265 discharges the gas inside the air supply column 27 into the second fixed column 251, and at the same time squeezes the extrusion block 253, driving the extrusion block 253 to secondarily fix the raw material, avoiding the influence of the excessive length of the raw material on the fixation of the raw material by the device, thereby affecting the processing quality of the cross groove. After the processing is completed, the movement of the clamping sleeve 222 causes the air supply column 27 to disengage from the first piston column 265. The gas inside the second fixed column 251 overflows through the air supply column 27. At the same time, the spring 252 resets the extrusion block 253. At the same time, during the second processing, the clamping sleeve 222 rotates following the rotation circle 12, causing the air supply column 27 to squeeze the second piston column 266, and inflating the inside of the second fixed column 251 again, so that the extrusion block 253 squeezes and fixes the raw material, avoiding the loose fixation of the raw material during processing and affecting the processing quality.

[0034] In an alternative embodiment, a rotation circle 12 is provided inside the connecting plate 11. A limiting rod 121 is provided on one side of the rotation circle 12. A limiting groove 123 is also provided on the connecting plate 11. A first groove is provided inside the limiting groove 123, and the size of the first groove is adapted to the limiting rod 121.

[0035] It should be noted that after the first processing is completed, the rotation of the rotation circle 12 drives the first motor 122 to rotate, thereby driving the clamping sleeve 222 to rotate. The raw material is cut again by the cutting knife 26, thereby completing the processing of the cross groove. At the same time, the two groups of limiting grooves 123 on the connecting plate 11 and the limiting rod 121 on the rotation circle 12 are used for limitation, ensuring that each rotation is 90 degrees and improving the processing precision.

[0036] In an alternative embodiment, a spring 252 is provided inside the second fixed column 251. One end of the spring 252 is connected to the extrusion block 253. The size of the air supply column 27 is adapted to the first piston column 265 and the second piston column 266.

[0037] It should be noted that the gas inside the air supply column 27 is squeezed into the second fixed column 251 by the first piston column 265 and the second piston column 266, increasing the air pressure inside the second fixed column 251 and continuously squeezing the extrusion block 253 on one side, so that the extrusion block 253 squeezes the raw material. At the same time, when the processing is completed, the spring 252 resets the extrusion block 253 for the next processing.

[0038] In an alternative embodiment, two groups of connecting rods 221 are provided on both sides of the connecting sleeve 22. Shells 211 are provided on one side of the two groups of connecting rods 221. The connecting rods 221 are slidably connected to the shells 211, and a first slide rail is provided on the shells 211.

[0039] It should be noted that the movement of the clamping sleeve 222 drives the movement of the connecting sleeve 22, and the movement of the connecting sleeve 22 drives the movement of the connecting rod 221. The connecting rod 221 slides inside the outer shell 211, thereby restricting the connecting rod 221. At the same time, the outer shell 211 is used to restrict the water sprayed by the nozzle 331 to fall into the first groove as much as possible for collection, and to avoid the splashing of impurities generated during processing from damaging the staff.

[0040] In an alternative embodiment, a push block 231 is provided at one end of the push rod 23, and the size of the push block 231 is adapted to the water storage bucket 24.

[0041] It should be noted that the movement of the connecting rod 221 drives the movement of the push rod 23, and the push rod 23 pushes the push block 231 to slide inside the water storage bucket 24. The water inside the water storage bucket 24 is squeezed into the spray water pipe 33 through the connecting pipe 32 for spraying, and the processed groove is rinsed.

[0042] In an alternative embodiment, a rotating shaft 261 is provided at the output end of the second motor 262. The rotating shaft 261 penetrates through the first fixing plate 263 and the second fixing plate 264. A first piston rod 265 is provided on the first fixing plate 263, and a first piston rod 265 is correspondingly provided on the second fixing plate 264.

[0043] It should be noted that the rotation of the second motor 262 drives the rotation of the rotating shaft 261, and the rotation of the second motor 262 drives the cutting knife 26 to rotate to process the raw material.

[0044] In an alternative embodiment, a first hole is provided at the bottom of the filter box 341, and a second groove is provided inside the base 1, and the size is adapted to the filter box 341.

[0045] It should be noted that through the first hole at the bottom of the filter box 341, the impurities generated during processing carried in the water sprayed from the nozzle 331 are collected, avoiding the blockage of the pipeline by the impurities entering the circulating water and the damage to the surface of the raw material, and at the same time collecting the impurities for subsequent use.

[0046] In an alternative embodiment, a one-way valve is provided on the second water pipe 312, a pressure valve is provided inside the connecting pipe 32, a nozzle 331 is provided at one end of the spray water pipe 33, and a second hole is provided on the nozzle 331.

[0047] It should be noted that the one-way valve on the second water pipe 312 enables the water tank 31 to replenish water to the water storage bucket 24 during each processing. At the same time, when the push block 231 squeezes the water inside the water storage bucket 24, all the water enters the spray water pipe 33 through the connecting pipe 32 for spraying.

[0048] Working principle: Before using this device, drive the push rod 21 to contract to one end by the first motor 122, place the raw material to be processed inside the connecting sleeve 22, and pre-fix the raw material by the first fixing column 25. After the fixing is completed, drive the push rod 21 to expand and contract by the first motor 122, thereby driving the clamping sleeve 222 to move. Drive the rotating shaft 261 to rotate by the second motor 262, thereby driving the cutting knife 26 to rotate to process the raw material fixed on the clamping sleeve 222, and first process a type groove. After the processing is completed, drive the first motor 122 to drive the push rod 21 to contract, and at the same time rotate the rotating circle 12 so that the limiting rod 121 contacts and presses against another set of limiting grooves 123, driving the first motor 122 to rotate. Then drive the first motor 122 to expand and contract again, driving the push rod 21 to move, thereby driving the raw material on the clamping sleeve 222 to move, and process a cross groove. At the same time, the expansion and contraction of the push rod 21 drives the clamping sleeve 222 to move, and the movement of the clamping sleeve 222 drives the connecting sleeve 22 to move. The movement of the connecting sleeve 22 squeezes the push rod 23, so that the liquid in the water storage bucket 24 enters the water spraying pipe 33 through the connecting pipe 32. When the extrusion reaches a certain degree, the liquid in the water spraying pipe 33 is sprayed out through the nozzle 331 to wash the raw material being processed, and at the same time cool the cutting knife 26 to prevent damage to the cutting knife 26 caused by long-term work. At the same time, when processing for the second time, the water sprayed out from the nozzle 331 washes the impurities inside the type groove processed on the raw material, avoiding affecting the precision of the second processing, and at the same time avoiding excessive impurities in the groove affecting the cutting knife 26.

[0049] At the same time, the water sprayed out from the nozzle 331 enters the filter box 341 through the second groove inside the base 1, filters the cutting impurities in the water through the first hole on the filter box 341, and collects them for subsequent use. At the same time, the filtered water enters the water return groove 34 through the first hole, and then enters the water tank 31 through the first water pipe 311 for repeated use, reducing the waste of water resources.

[0050] At the same time, during the first processing, the movement of the clamping sleeve 222 drives the air supply column 27 to move. The movement of the air supply column 27 contacts the first piston column 265 at one end. The first piston column 265 discharges the gas inside the air supply column 27 into the second fixed column 251, and at the same time squeezes the extrusion block 253, driving the extrusion block 253 to secondarily fix the raw material, avoiding the influence of the excessive length of the raw material on the fixation of the raw material by the device, thus affecting the processing quality of the cross groove. After the processing is completed, the movement of the clamping sleeve 222 causes the air supply column 27 to disengage from the first piston column 265. The gas inside the second fixed column 251 overflows through the air supply column 27. At the same time, the spring 252 resets the extrusion block 253. During the second processing, the clamping sleeve 222 rotates following the rotation of the rotation circle 12, causing the air supply column 27 to squeeze the second piston column 266, and inflating the inside of the second fixed column 251 again, so that the extrusion block 253 squeezes and fixes the raw material, avoiding the loose fixation of the raw material during processing and affecting the processing quality.

[0051] After the first processing is completed, the rotation of the rotation circle 12 drives the rotation of the first motor 122, thereby driving the rotation of the clamping sleeve 222. The raw material is cut again by the cutting knife 26, thus completing the processing of the cross groove. At the same time, the two sets of limiting grooves 123 on the connecting plate 11 and the limiting rods 121 on the rotation circle 12 are used for limitation, ensuring that each rotation is 90 degrees, improving the processing precision. The movement of the clamping sleeve 222 drives the movement of the connecting sleeve 22, and the movement of the connecting sleeve 22 drives the movement of the connecting rod 221. The connecting rod 221 slides inside the outer shell 211, thereby limiting the connecting rod 221. At the same time, the outer shell 211 is used to limit the water sprayed by the nozzle 331 to fall as much as possible from the first groove for collection, and at the same time avoid the splashing of impurities generated during processing from causing damage to the staff.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic forming device for processing a cross groove, comprising a base (1), characterized in that: A processing mechanism (2) is arranged on the base (1), and a circulation mechanism (3) is also arranged on one side of the base (1). A connecting plate (11) is also arranged on one side of the base (1), and a first motor (122) is arranged inside the connecting plate (11); The processing mechanism (2) comprises a push rod (21) arranged at the output end of a first motor (122), a clamping sleeve (222) being arranged on one side of the push rod (21), two groups of first fixed columns (25) being arranged on the clamping sleeve (222), a second fixed column (251) being arranged on one side of the two groups of first fixed columns (25), an extrusion block (253) being arranged inside the second fixed column (251), one end of the extrusion block (253) being connected to an air supply column (27), and a connecting rod (253) being arranged on the outside of the clamping sleeve (222). A connecting sleeve (22), a push rod (23) is provided at one end of the connecting sleeve (22), a water storage bucket (24) is provided at one end of the push rod (23), a second motor (262) is provided inside the base (1), a cutting knife (26) is provided at one end of the second motor (262), a second fixing plate (264) is provided at the upper end of the cutting knife (26), second piston columns (266) are respectively provided on both sides of the second fixing plate (264), and first piston columns (265) are also provided on both sides of the cutting knife (26); The circulation mechanism (3) comprises a water tank (31) arranged at the upper end of the second fixed plate (264); a first water pipe (311) is arranged on one side of the water tank (31); one side of the first water pipe (311) passes through the base (1) and is connected to a return water tank (34); a filter box (341) is arranged at the upper end of the return water tank (34); two groups of second water pipes (312) are also connected to the bottom of the water tank (31); one end of the second water pipe (312) is connected to a water storage bucket (24); one end of the water storage bucket (24) is provided with a connecting pipe (32); one end of the connecting pipe (32) is connected to a water spray pipe (33).

2. The automatic forming device for processing a cross groove according to claim 1, characterized in that: A rotating circle (12) is arranged inside the connecting plate (11), a limiting rod (121) is arranged on one side of the rotating circle (12), and a limiting groove (123) is also arranged on the connecting plate (11), a first groove is arranged inside the limiting groove (123), and the size of the first groove is adapted to the limiting rod (121).

3. The automatic forming device for processing a cross groove according to claim 1, characterized in that: A spring (252) is arranged inside the second fixed column (251), one end of the spring (252) is connected to the extrusion block (253), and the size of the air supply column (27) is adapted to the first piston column (265) and the second piston column (266).

4. The automatic forming device for processing a cross groove according to claim 1, characterized in that: Two groups of connecting rods (221) are arranged on both sides of the connecting sleeve (22), one side of each of the two groups of connecting rods (221) is provided with a shell (211), the connecting rods (221) are slidably connected to the shell (211), and a first slide rail is arranged on the shell (211).

5. The automatic forming device for processing a cross groove according to claim 1, characterized in that: A push block (231) is provided at one end of the push rod (23), and the size of the push block (231) is adapted to the water storage bucket (24).

6. The automatic forming device for processing a cross groove according to claim 5, characterized in that: The output end of the second motor (262) is provided with a rotating shaft (261), and the rotating shaft (261) passes through the first fixed plate (263) and the second fixed plate (264). The first fixed plate (263) is provided with a first piston column (265), and the second fixed plate (264) is correspondingly provided with a first piston column (265).

7. The automatic forming device for processing a cross groove according to claim 1, characterized in that: The bottom of the filter box (341) is provided with a first hole, and the interior of the base (1) is provided with a second groove, the size of which is adapted to the filter box (341).

8. The automatic forming device for processing a cross groove according to claim 1, characterized in that: A one-way valve is provided on the second water pipe (312), a pressure valve is provided inside the connecting pipe (32), a spray head (331) is provided at one end of the water spray pipe (33), and a second hole is provided on the spray head (331).

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