A tin printing workshop tin cleaning device

Abstract

The present application relates to a kind of iron can printing workshop with iron skin cleaning device, including cleaning mechanism, adsorption mechanism, conveying mechanism and water suction mechanism, cleaning mechanism includes shell, front cleaning component and back cleaning component, front cleaning component, back cleaning component and water suction mechanism are sequentially arranged in shell, material inlet window is opened in shell, adsorption mechanism is arranged below front cleaning component, conveying mechanism is arranged below adsorption mechanism and back cleaning component;Front cleaning component and back cleaning component all include water jet component and cleaning agent spray head, water jet component includes base and nozzle, nozzle is ferromagnetic material, nozzle is connected with base universal rotation.This iron can printing workshop with iron skin cleaning device of the present application can realize the automatic cleaning of iron skin, after cleaning, automatically turn over and clean again, cleaning efficiency is high, and after cleaning, two sides can also be wiped dry, water suction mechanism can automatically squeeze water, without manual intervention, save time and effort.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of iron skin cleaning device for iron can printing workshop. BACKGROUND

[0002] Iron can printing is made into pop can after printing iron skin, because there will be oil stains, iron filings and other impurities on the iron skin, which will be not conducive to printing, so the iron skin needs to be cleaned before printing. Especially the iron skin after cutting and printing, iron filings are relatively serious, and the front and back of the iron skin need to be washed clean. At present, the cleaning of the iron skin after cutting is through machine cleaning and then manual turning, and then machine cleaning after turning, however, due to the large number of iron skin after cutting, the process of manual turning and cleaning is relatively long, time-consuming and laborious, and the efficiency is low. SUMMARY

[0003] The technical problem to be solved by the present application is: in order to overcome the above technical problems, the present application provides an iron skin cleaning device for iron can printing workshop.

[0004] The technical scheme adopted by the present application to solve its technical problem is: an iron skin cleaning device for iron can printing workshop, comprising a cleaning mechanism, an adsorption mechanism, a conveying mechanism and a water suction mechanism, the cleaning mechanism comprises a shell, a front cleaning assembly and a back cleaning assembly, the front cleaning assembly, the back cleaning assembly and the water suction mechanism are arranged in the shell in sequence, the shell is provided with an inlet window, the adsorption mechanism is arranged below the front cleaning assembly, and the conveying mechanism is arranged below the adsorption mechanism and the back cleaning assembly.

[0005] The adsorption mechanism comprises a rotating seat, a rotating wheel, a rotary joint, an air pump and a plurality of adsorption assemblies, the rotating seat is located below the front cleaning assembly, the rotating wheel is rotatably connected with the rotating seat, the adsorption assemblies are distributed on the outer periphery of the rotating wheel, the adsorption mechanism is located in the shell, and the inlet window is located on one side of the rotating wheel.

[0006] Each adsorption assembly comprises a main adsorption unit and an auxiliary adsorption unit, the main adsorption unit comprises an exhaust pipe, a corrugated pipe, a suction cup and an air outlet pipe, one end of the exhaust pipe is communicated with one end of the corrugated pipe, the other end of the exhaust pipe is communicated with one end of the air outlet pipe, the other end of the air outlet pipe is communicated with a rotary joint, the rotary joint is connected with a gas pump, the other end of the corrugated pipe is sealingly connected with the suction cup, the suction cup is provided with an exhaust hole, the bottom of the suction cup is provided with a connecting column, a sensing assembly is installed in the exhaust pipe, the sensing assembly comprises a mounting pipe, a transmission block, a spring and a pressure sensor, the mounting pipe is fixed in the exhaust pipe, the pressure sensor is fixed at the bottom of the mounting pipe, one end of the transmission block is connected with the pressure sensor through the spring, the other end of the transmission block is connected with the connecting column, and the connecting column and the transmission block are connected in a universal rotation mode, and the exhaust pipe is fixed on the outer periphery of the rotating wheel; the auxiliary adsorption unit comprises a mounting column, the mounting column is fixed on the outer periphery of the rotating wheel, and the mounting column is provided with an electromagnet.

[0007] The conveying mechanism comprises a drainage groove, a filter screen, guide rods and a conveying belt, the drainage groove is located below the adsorption mechanism and the reverse side cleaning assembly, the conveying belt is installed in the drainage groove, the two sides of the conveying belt are provided with guide rods, the guide rods are arranged along the conveying direction of the conveying belt, the lower side of the guide rods is lower than the conveying belt, the upper side of the guide rods is higher than the conveying belt, and the two ends of the guide rods are fixed with the two ends of the drainage groove, and the drainage groove is provided with the filter screen, and the filter screen is located above the guide rods and the conveying belt.

[0008] The water absorbing mechanism comprises upper and lower water absorbing rollers, the rotating directions of the upper and lower water absorbing rollers are opposite, the surfaces of the upper and lower water absorbing rollers are wrapped with a certain thickness of cloth, one side of the upper water absorbing roller abuts against a water scraping plate, the water scraping plate is arranged in an inclined mode, and the water scraping plate gradually inclines downward in the direction away from the upper water absorbing roller, and the lower side of the lower water absorbing roller is provided with a fixed roller abutting against the surface of the lower water absorbing roller; and the water absorbing mechanism is located above the drainage groove.

[0009] Each nozzle is communicated with the water outlet pipe, and each cleaning agent spray head is communicated with the cleaning agent outlet pipe.

[0010] The end of the connecting column, away from the suction cup, is provided with a ball, the top of the transmission block is provided with a spherical groove, and the connecting column is connected with the spherical groove of the transmission block in a universal rotation mode through the ball.

[0011] The top of the mounting column is provided with an adsorption panel.

[0012] The drainage groove is provided with a drainage opening.

[0013] The iron sheet cleaning device for an iron tank printing workshop has the advantages that the iron sheet can be automatically cleaned, the iron sheet can be automatically turned over and cleaned again after cleaning, the cleaning efficiency is high, the iron sheet can be dried on both sides after cleaning, the water absorbing mechanism can automatically squeeze water, and manual intervention is not needed, thereby saving time and effort. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the tin sheet cleaning device for tin can printing workshops according to the present invention.

[0016] Figure 2 This is a schematic diagram of the main adsorption unit of the tin sheet cleaning device for tin can printing workshop of the present invention.

[0017] Figure 3 This is a schematic diagram of the auxiliary adsorption unit of the tin sheet cleaning device for tin can printing workshops according to the present invention.

[0018] Figure 4 This is a top view schematic diagram of the conveying mechanism of the tin sheet cleaning device for tin can printing workshop of the present invention.

[0019] Figure 5 yes Figure 1 A magnified view of a portion of point A in the middle.

[0020] Figure 6 This is a top view schematic diagram of the upper suction roller and the scraper blade working together in the tin can printing workshop cleaning device of the present invention.

[0021] In the diagram: 1. Housing; 1-1. Feed window; 2. Front cleaning assembly; 3. Back cleaning assembly; 4. Water spray assembly; 4-1. Base; 4-2. Nozzle; 5. Cleaning agent nozzle; 6. Rotating seat; 7. Rotary wheel; 8. Rotary joint; 9. Upper suction roller; 10. Lower suction roller; 11. Scraper; 12. Fixed roller; 13. Water outlet pipe; 14. Cleaning agent outlet pipe; 15. Drain outlet; 16. Drainage trough. 7. Filter screen; 18. Guide rod; 19. Conveyor belt; 20. Flannel cloth; 100. Main adsorption unit; 101. Exhaust pipe; 102. Corrugated pipe; 103. Suction cup; 104. Air outlet pipe; 105. Connecting column; 106. Sphere; 107. Mounting tube; 108. Transmission block; 109. Spring; 110. Pressure sensor; 200. Auxiliary adsorption unit; 201. Mounting column; 202. Adsorption panel. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0023] like Figure 1As shown, the iron sheet cleaning device for iron can printing workshop of the present application comprises a cleaning mechanism, an adsorption mechanism, a conveying mechanism and a water absorption mechanism, the cleaning mechanism comprises a shell 1, a front surface cleaning assembly 2 and a back surface cleaning assembly 3, the front surface cleaning assembly 2, the back surface cleaning assembly 3 and the water absorption mechanism are sequentially arranged in the shell 1, an inlet window 1-1 is formed in the shell 1, the adsorption mechanism is arranged below the front surface cleaning assembly 2, and the conveying mechanism is arranged below the adsorption mechanism and the back surface cleaning assembly 3.

[0024] The front surface cleaning assembly 2 and the back surface cleaning assembly 3 each comprise a water spraying assembly 4 and a cleaning agent spraying head 5, the water spraying assembly 4 comprises a base 4-1 and a nozzle 4-2, the nozzle 4-2 is made of ferromagnetic material, and the nozzle 4-2 is connected with the base 4-1 in a universal manner.

[0025] The adsorption mechanism comprises a rotating seat 6, a rotating wheel 7, a rotary joint 8, a gas pump and a plurality of adsorption assemblies, the rotating seat 6 is located below the front surface cleaning assembly 2, the rotating wheel 7 is connected with the rotating seat 6 in a rotating manner, the adsorption assemblies are distributed on the outer periphery of the rotating wheel 7, the adsorption mechanism is located in the shell 1, and the inlet window 1-1 is located on one side of the rotating wheel 7.

[0026] Each adsorption assembly comprises a main adsorption unit 100 and an auxiliary adsorption unit 200, as shown in the figure. Figure 2 As shown, the main adsorption unit 100 comprises an exhaust pipe 101, a corrugated pipe 102, a suction cup 103 and an air outlet pipe 104, one end of the exhaust pipe 101 is in communication with one end of the corrugated pipe 102, the other end of the exhaust pipe 101 is in communication with one end of the air outlet pipe 104, the other end of the air outlet pipe 104 is connected with the rotary joint 8, the rotary joint 8 is connected with the gas pump, the other end of the corrugated pipe 102 is sealingly connected with the suction cup 103, the suction cup 103 is provided with an exhaust hole, the suction cup 103 is provided with a connecting column 105 at the bottom, a sensing assembly is installed in the exhaust pipe 101, the sensing assembly comprises a mounting pipe 107, a transmission block 108, a spring 109 and a pressure sensor 110, the mounting pipe 107 is fixed in the exhaust pipe 101, the pressure sensor 110 is fixed at the bottom of the mounting pipe 107, one end of the transmission block 108 is connected with the pressure sensor 110 through the spring 109, the other end of the transmission block 108 is connected with the connecting column 105, and the connecting column 105 and the transmission block 108 are connected in a universal manner, and the exhaust pipe 101 is fixed on the outer periphery of the rotating wheel 7. Figure 3 As shown, the auxiliary adsorption unit 200 comprises a mounting column 201, the mounting column 201 is fixed on the outer periphery of the rotating wheel 7, and the mounting column 201 is provided with an electromagnet.

[0027] As shown in the figure, Figure 1 , Figure 4As shown, the conveying mechanism includes a drainage groove 16, a filter screen 17, guide rods 18 and a conveying belt 19. The drainage groove 16 is located below the adsorption mechanism and the reverse side cleaning assembly 3. The conveying belt 19 is installed in the drainage groove 16. The guide rods 18 are arranged on both sides of the conveying belt 19 and in the conveying direction of the conveying belt 19. The lower part of the guide rods 18 is lower than the conveying belt 19, and the upper part of the guide rods 18 is higher than the conveying belt 19. The two ends of the guide rods 18 are fixed with the two ends of the drainage groove 16. The filter screen 17 is arranged in the drainage groove 16 and above the guide rods 18 and the conveying belt 19.

[0028] As shown in Figures 5-6 As shown, the water suction mechanism includes an upper water suction roller 9 and a lower water suction roller 10. The rotation directions of the upper water suction roller 9 and the lower water suction roller 10 are opposite. The upper water suction roller 9 and the lower water suction roller 10 are independently driven by motors, so that the rotation directions are opposite, thereby conveying the iron sheet. The surfaces of the upper water suction roller 9 and the lower water suction roller 10 are wrapped with a certain thickness of cloth 20. One side of the upper water suction roller 9 abuts against a water scraping plate 11. The water scraping plate 11 is arranged obliquely. The water scraping plate 11 gradually inclines downward in a direction away from the upper water suction roller 9. The lower part of the lower water suction roller 10 is provided with a fixed roller 12 abutting against the surface of the lower water suction roller 10. The water suction mechanism is located above the drainage groove 16.

[0029] Each nozzle 4-2 is communicated with the water outlet pipe 13. Each cleaning agent nozzle 5 is communicated with the cleaning agent outlet pipe 14.

[0030] The connecting column 105 has a ball 106 at the end away from the suction cup 103. The top of the transmission block 108 has a spherical groove. The connecting column 105 is connected with the spherical groove of the transmission block 108 through the ball 106 in a universal rotation mode.

[0031] The mounting column 201 is provided with a suction panel 202 at the top. The suction panel 202 can be made of elastic material, such as rubber, to avoid scratching the surface of the iron sheet.

[0032] The drainage groove 16 is provided with a drainage opening 15.

[0033] The iron sheet cleaning device for iron tank printing workshop of the present application can realize automatic cleaning of the iron sheet, automatic turning and cleaning after cleaning, high cleaning efficiency, and automatic drying of both sides after cleaning. The water suction mechanism can automatically squeeze water, without manual intervention, saving time and effort. Specifically, the working process of the present application is as follows:

[0034] As shown in Figures 1-3As shown, the iron sheet is put into the adsorption mechanism in the shell 1 from the feeding window 1-1 by manual, due to the force pressed by manual and the gravity of the iron sheet, the suction cup 103 is pressed down, the connecting column 105 at the bottom of the suction cup 103 is moved down, since the connecting column 105 is connected with the transmission block 108 in universal rotation, the connecting column 105 can rotate in universal, and the suction cup 103 is connected with the bellows 102 which can stretch and contract, so the suction cup 103 can also rotate in universal, which can facilitate the manual to put the iron sheet on the suction cup 103, without paying attention to the angle of the suction cup 103, and the iron sheet will not be bumped due to the angle. The connecting column 105 moves down, the transmission block 108 moves down, the compression spring 109, the spring 109 generates pressure on the pressure sensor 110, the pressure sensor 110 sends the pressure signal to the PLC controller, and starts the air pump and electromagnet to work. After the air pump works, the rotary joint 8 connected with the air pump draws air from the air outlet pipe 104, the air in the suction cup 103 is drawn out from the exhaust hole to the bellows 102, then enters the exhaust space between the bellows 102 and the installation pipe 107, and finally is discharged from the air outlet pipe 104, the air in the suction cup 103 is discharged, so that the suction cup 103 can firmly adsorb the surface of the iron sheet. After the electromagnet works, due to the fact that the iron sheet is a ferromagnetic material, the auxiliary adsorption unit 200 can adsorb the iron sheet, so as to assist the main adsorption unit 100 to adsorb the iron sheet. At the same time, the rotating wheel 7 on the rotating seat 6 is driven to rotate by the motor, which drives each adsorption assembly to rotate, so that the iron sheet adsorbed on the adsorption assembly is rotated to the lower side of the water spraying assembly 4 and the cleaning agent nozzle 5 of the front cleaning assembly 2 for cleaning. The cleaning agent nozzle 5 can spray the cleaning agent from the cleaning agent discharge pipe 14 to the iron sheet, and the nozzle 4-2 of the water spraying assembly 4 sprays the cleaning agent to clean the iron sheet. The nozzle 4-2 is made of ferromagnetic material and can rotate in universal on the base 4-1, the auxiliary adsorption unit 200 has an electromagnet, so that the nozzle 4-2 can automatically turn to the auxiliary adsorption unit 200 close to it, and then more targetedly sprays water to the surface of the iron sheet. The spraying range of the nozzle 4-2 can be relatively large, and is not limited to spraying a certain part of the surface of the iron sheet. The front cleaning assembly 2 is provided with multiple groups of water spraying assemblies 4 and cleaning agent nozzles 5 towards the rotating wheel 7, so that the surface of the iron sheet can be fully cleaned. Figure 1 、 Figure 4As shown, the cleaning agent, sewage and iron filings dropped after cleaning will enter the drainage tank 16 of the lower conveying mechanism, the filter screen 17 in the drainage tank 16 filters the sewage, and the sewage can be discharged from the drain 15. The cleaning agent, sewage and iron filings dropped from the top to the guide rod 18 and the conveying belt 19 will be cleaned by the continuous flushing of the water spraying assembly 4 and the cleaning agent nozzle 5 of the front cleaning assembly 2. In order to clean the front of the iron sheet, the front cleaning assembly 2 can not be provided with the cleaning agent nozzle 5 at the position close to the back cleaning assembly 3, and several water spraying assemblies 4 are provided to clean the front of the iron sheet. The specific number and position of the water spraying assembly 4 and the cleaning agent nozzle 5 can be adjusted according to the actual cleaning requirement. The iron sheet on the adsorption mechanism rotates with the rotating wheel 7, and the iron sheet is adsorbed by the adsorption assembly and conveyed to the back cleaning assembly 3. Figure 1 As shown, the rotating wheel 7 rotates clockwise to send the iron sheet to the next cleaning process. The iron sheet is rotated to the position of the back cleaning assembly 3. Figure 1 When the front cleaning assembly 2 is close to the back cleaning assembly 3, the position of the iron sheet relative to the adsorption assembly changes, the spring 109 is subjected to the action of the gravity of the iron sheet, the pressure sensor 110 is subjected to the pressure reduction, and the threshold value can be set according to the actual weight of the iron sheet. When the threshold value is less than the threshold value, the pressure sensor 110 sends a signal to the PLC, so that the PLC controls the air pump and the electromagnet to stop working, the iron sheet is no longer adsorbed by the adsorption assembly, and thus falls to the lower conveying belt 19. And, at this time, the iron sheet has actually been turned over with the rotating wheel 7, so that the iron sheet falls with the cleaned front down and the uncleaned back up. The iron sheet moves to the back of the back cleaning assembly 3 with the conveying belt 19, and the back of the iron sheet is cleaned by the water spraying assembly 4 and the cleaning agent nozzle 5 of the back cleaning assembly 3. Similarly, in order to clean the back of the iron sheet, the back cleaning assembly 3 can not be provided with the cleaning agent nozzle 5 at the end position, and several water spraying assemblies 4 are provided to clean the back of the iron sheet. The specific number and position of the water spraying assembly 4 and the cleaning agent nozzle 5 can be adjusted according to the actual cleaning requirement. The cleaning agent, sewage and iron filings dropped after cleaning of the back cleaning assembly 3 also enter the lower drainage tank 16, and the filter screen 17 in the drainage tank 16 filters the sewage. After the back of the iron sheet is cleaned, the iron sheet enters the water suction mechanism, the upper water suction roller 9 and the lower water suction roller 10 rotate in opposite directions, so as to convey the cleaned iron sheet. At the same time of conveying, the velvet 20 wrapped on the surface of the upper water suction roller 9 and the lower water suction roller 10 wipes the surface of the iron sheet. Figures 5-6 As shown, the water wiping plate 11 on one side of the upper water suction roller 9 can extrude the velvet 20 on the surface of the upper water suction roller 9, and the wiped water slides along the inclined water wiping plate 11 and falls into the drainage tank 16. The fixed roller 12 abuts against the surface of the lower water suction roller 10, which can extrude the velvet 20 on the surface of the lower water suction roller 10, and the wiped water directly falls into the drainage tank 16. Thus, the front and back of the iron sheet are cleaned.

[0035] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A can body cleaning device for a can printing plant, characterized by, The utility model relates to a kind of automatic cleaning machine, including cleaning mechanism, adsorption mechanism, conveying mechanism and water suction mechanism, the cleaning mechanism includes shell (1), front cleaning component (2) and reverse cleaning component (3), the front cleaning component (2), reverse cleaning component (3) and water suction mechanism are sequentially arranged in shell (1) in front and back, the shell (1) is opened with inlet window (1-1), the adsorption mechanism is arranged below front cleaning component (2), the conveying mechanism is arranged below adsorption mechanism and reverse cleaning component (3); The front cleaning component (2) and reverse cleaning component (3) include water spraying component (4) and cleaning agent spray head (5), the water spraying component (4) includes base (4-1) and nozzle (4-2), the nozzle (4-2) is ferromagnetic material, the nozzle (4-2) is connected with base (4-1) universal rotation; The adsorption mechanism includes rotating seat (6), rotating wheel (7), rotary joint (8), air pump and several adsorption components, the rotating seat (6) is below front cleaning component (2), rotating wheel (7) is connected with rotating seat (6) rotation, the adsorption component is distributed in the outer periphery of rotating wheel (7), the adsorption mechanism is located in shell (1), inlet window (1-1) is located at one side of rotating wheel (7); Each adsorption component includes main adsorption unit (100) and auxiliary adsorption unit (200), the main adsorption unit (100) includes exhaust pipe (101), bellow (102), suction cup (103) and air outlet pipe (104), one end of exhaust pipe (101) is communicated with one end of bellow (102), the other end of exhaust pipe (101) is communicated with one end of air outlet pipe (104), the other end of air outlet pipe (104) is communicated with rotary joint (8), the rotary joint (8) is connected with air pump, the other end of bellow (102) is sealingly connected with suction cup (103), the suction cup (103) is provided with exhaust hole, the suction cup (103) is provided with connecting column (105), the exhaust pipe (101) is provided with sensing component, the sensing component includes mounting pipe (107), transmission block (108), spring (109) and pressure sensor (110), the mounting pipe (107) is fixed in exhaust pipe (101), the pressure sensor (110) is fixed at the bottom of mounting pipe (107), one end of transmission block (108) is connected with pressure sensor (110) through spring (109), the other end of transmission block (108) is connected with connecting column (105), and connecting column (105) and transmission block (108) are universal rotation, the exhaust pipe (101) is fixed in the outer periphery of rotating wheel (7);The auxiliary adsorption unit (200) includes mounting column (201), the mounting column (201) is fixed in the outer periphery of rotating wheel (7), and mounting column (201) is provided with electromagnet.

2. The can body cleaning apparatus for a can printing plant according to claim 1, wherein The conveying mechanism comprises a drainage groove (16), a filter screen (17), guide rods (18) and a conveying belt (19), the drainage groove (16) is located below the adsorption mechanism and the reverse surface cleaning assembly (3), the conveying belt (19) is installed in the drainage groove (16), the guide rods (18) are arranged on both sides of the conveying belt (19), the guide rods (18) are arranged along the conveying direction of the conveying belt (19), the lower part of the guide rods (18) is lower than the conveying belt (19), the upper part of the guide rods (18) is higher than the conveying belt (19), and the two ends of the guide rods (18) are fixed with the two ends of the drainage groove (16); the filter screen (17) is arranged in the drainage groove (16) and located above the guide rods (18) and the conveying belt (19).

3. The can body cleaning apparatus for a can printing line according to claim 2, wherein The water suction mechanism comprises upper water suction rollers (9) and lower water suction rollers (10), the upper water suction rollers (9) and the lower water suction rollers (10) rotate in opposite directions and are independently driven by motors, so that the iron sheet is conveyed out, the upper water suction rollers (9) and the lower water suction rollers (10) are wrapped with a certain thickness of cloth (20), one side of the upper water suction rollers (9) abuts against a water scraping plate (11), the water scraping plate (11) is inclined, and the water scraping plate (11) gradually inclines downward in a direction away from the upper water suction rollers (9), the lower water suction rollers (10) are provided with fixed rollers (12) below, and the fixed rollers (12) abut against the surfaces of the lower water suction rollers (10); and the water suction mechanism is located above the drainage groove (16).

4. The can body cleaning apparatus for a can printing plant according to claim 1, wherein Each nozzle (4-2) is communicated with the water outlet pipe (13), and each cleaning agent nozzle (5) is communicated with the cleaning agent outlet pipe (14).

5. The can body cleaning apparatus for a can printing line according to claim 1, wherein The end, away from the suction disc (103), of the connecting column (105) is provided with a ball (106), the top of the transmission block (108) is provided with a spherical groove, and the connecting column (105) is connected with the spherical groove of the transmission block (108) in a universal rotation mode through the ball (106).

6. The can body cleaning apparatus for a can printing line according to claim 1, wherein The mounting column (201) is provided with an adsorption panel (202) at the top.

7. The can body cleaning apparatus for a can printing line according to claim 2, wherein The drainage groove (16) is provided with a drainage opening (15).

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