Sample bottle cleaning device of water automatic station

Abstract

The sample bottle cleaning device comprises a water tank, a transparent cleaning box fixedly installed at the top of the water tank and a plurality of water automatic station sample bottles arranged in the transparent cleaning box, the top of the transparent cleaning box is provided with an opening, and a band-type brake motor is fixedly installed at the top of the right side of the transparent cleaning box. By arranging a series of structures, a plurality of water automatic station sample bottles can be conveniently and synchronously locked and automatically overturned to be downward, the plurality of water automatic station samples can be conveniently and synchronously washed after being overturned to be downward, the water automatic station samples can be integrally, conveniently and quickly dried after being cleaned, the cleaning efficiency is improved, and the labor intensity of workers is reduced. By means of the mode that the water is overturned downwards to be washed, water can flow out automatically, people do not need to pour out the water by overturning independently, time and labor are saved, the use automation degree is improved, by means of the mode of integrated drying after cleaning, the time for waiting for drying of water left and attached to the inner side is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sample bottle cleaning equipment, in particular to a sample bottle cleaning device for an automatic water station. Background Art

[0002] After each sample collection, storage, and inspection, the sample bottles used in automatic water stations need to be cleaned to avoid mixing with residual samples from previous storages when the water samples are stored again, thereby preventing the accuracy of the test data from being affected. The current cleaning method for the sample bottles is to rinse the inside of the sample bottles with water, then manually flip the sample bottles to pour out the water, and wait for it to drain out and dry. This method has the following shortcomings:

[0003] 1. The method of rinsing and pouring out water separately has low cleaning efficiency due to the large number of sample bottles. It is impossible to clean multiple sample bottles at the same time and automatically supply water and drain them, and the degree of automation is not ideal. 2. After cleaning and pouring out the water, it is inevitable that there will be water residue attached to the inside of the sample bottle. The method of waiting for drying has low drying efficiency and cannot perform drying work conveniently after cleaning. In view of this, the present application proposes a sample bottle cleaning device with a water automatic station to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a sample bottle cleaning device for an automatic water station to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sample bottle cleaning device for an automatic water station, comprising a water tank, a transparent cleaning box fixedly mounted on the top of the water tank, and a plurality of automatic water station sample bottles arranged in the transparent cleaning box, the top of the transparent cleaning box being set to an opening, a brake motor being fixedly mounted on the top right side of the transparent cleaning box, the left end of the output shaft of the brake motor extending into the transparent cleaning box and fixedly connected to a rectangular tube with a blocking structure at the right end, a plurality of positioning sleeves being fixedly connected to the top of the rectangular tube at equal intervals, an adhesive sleeve in the positioning sleeve being provided with a sponge sleeve with an opening at the top, a plurality of automatic water station sample bottles being movably inserted into corresponding sponge sleeves respectively, and the plurality of sponge sleeves being used for surrounding and positioning the plurality of automatic water station sample bottles by simply inserting downward;

[0006] A synchronous locking assembly is installed on the rectangular tube, which is in tight contact with the right sides of multiple water automatic station sample bottles. A first electric push rod with an extended end rotatably connected to the synchronous locking assembly is fixedly installed on the left side of the transparent cleaning box. The synchronous locking assembly is used to synchronously lock and prevent the multiple water automatic station sample bottles from falling off when the first electric push rod is started. The brake motor is used to drive the rectangular tube to rotate, and the rectangular tube is used to drive the multiple fixed water automatic station sample bottles to flip downward or rotate upward through multiple positioning sleeves;

[0007] The transparent cleaning box is provided with a telescopic flushing and blowing assembly located below multiple water automatic station sample bottles, a water pump is fixedly installed on the bottom right side of the transparent cleaning box, the water outlet of the water pump is connected and fixed to the telescopic flushing and blowing assembly, the water inlet of the water pump extends into the water tank and is connected and fixed with a water suction pipe, an air guide hood connected and fixed to the telescopic flushing and blowing assembly is embedded and fixed on the bottom left side of the transparent cleaning box, the bottom of the air guide hood is connected and fixed with a hot air blower with an air outlet at the top, a second electric push rod with an extended end fixedly connected to the telescopic flushing and blowing assembly is fixedly installed on the bottom of the transparent cleaning box, the telescopic flushing and blowing assembly is used to be inserted into multiple downward-facing water automatic station sample bottles when the second electric push rod is started, and is used to synchronously flush the interior of multiple water automatic station sample bottles when the water pump is started, and is also used to synchronously dry the interior of multiple water automatic station sample bottles when the hot air blower is started after flushing.

[0008] Preferably, the synchronous locking assembly includes a rectangular rod slidably mounted in a rectangular tube, a plurality of L-shaped pressure blocks are fixedly connected to the top of the rectangular rod, the top of the L-shaped pressure block extends to the top of the rectangular tube, and an anti-slip rubber block is bonded and fixed to the left side of the L-shaped pressure block, the left side of the anti-slip rubber block is tightly contacted with the right side of the corresponding water automatic station sample bottle, the positioning sleeve is movably mounted on the corresponding L-shaped pressure block, the sponge sleeve is movably mounted on the corresponding anti-slip rubber block, and the left end of the rectangular rod is rotatably connected to the protruding end of the first electric push rod.

[0009] Preferably, the telescopic flushing and blowing assembly includes a U-shaped tube, the top of the U-shaped tube is connected and fixed with multiple tube heads, the tube heads are located below the corresponding water automatic station sample bottles, both ends of the bottom of the U-shaped tube are connected and fixed with a one-way valve with the top as the outlet, the bottoms of the two one-way valves are connected and fixed with a telescopic hose, the bottom end of the telescopic hose on the right is connected and fixed with the water outlet of the water pump, the bottom end of the telescopic hose on the left is connected and fixed with the top of the air guide cover, and the inner top of the U-shaped tube is fixedly connected to the protruding end of the second electric push rod.

[0010] Preferably, a drain valve is connected and fixed to the bottom of the right side of the transparent cleaning box.

[0011] Preferably, four legs are fixedly connected between the bottom of the transparent cleaning box and the top of the water tank in a rectangular shape.

[0012] Preferably, a plurality of rectangular through-holes are formed on the top of the rectangular tube, and the front inner walls and the rear inner walls of the rectangular through-holes are in active contact with the front and rear sides of the corresponding L-shaped pressing blocks respectively.

[0013] Preferably, a water supply pipe is connected and fixed to the top of the rear side of the water tank.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This sample bottle cleaning device for an automatic water station can synchronously lock multiple sample bottles in the automatic water station and automatically flip them downwards through the cooperation of the positioning sleeve, sponge sleeve, rectangular tube, synchronous locking assembly, brake motor and first electric push rod. It does not require personnel to flip and pour out the water separately, saving time and effort.

[0016] 2. The sample bottle cleaning device of the water automatic station cooperates with the telescopic flushing and blowing assembly, the water pump, the water tank and the second electric push rod to facilitate the synchronous flushing of multiple water automatic station samples from bottom to top after turning it downward. The method of synchronously cleaning multiple water automatic station samples improves the cleaning efficiency. By turning it downward for flushing, water can flow out automatically, and there is no need for personnel to flip it over and pour out the water separately, which saves time and effort and improves the degree of automation.

[0017] 3. This sample bottle cleaning device of the water automatic station, through the cooperation of the telescopic flushing and blowing component and the hot air blower, can perform the integrated and quick drying work on the inside of multiple water automatic station samples after cleaning. The integrated drying method after cleaning is used to reduce the waiting time for the residual water on the inside to dry, thereby further improving work efficiency.

[0018] The utility model is provided with a series of structures, which facilitates the synchronous locking of multiple water automatic station sample bottles and automatically flips them downward, facilitates the synchronous flushing of multiple water automatic station samples after flipping them downward, and performs integrated convenient and fast drying after cleaning, thereby improving the cleaning efficiency. By utilizing the method of flipping them downward for flushing, water can flow out automatically, and there is no need for personnel to flip them over and pour out the water separately, which saves time and effort and improves the degree of automation of use. In addition, by utilizing the method of integrated drying after cleaning, the time waiting for drying of residual water inside is reduced, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a sample bottle cleaning device for an automatic water station proposed by the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure;

[0021] Figure 3 for Figure 2 Schematic diagram of the structure of the water automatic station sample bottle flipped to the downward state;

[0022] Figure 4 for Figure 2 A schematic diagram of the enlarged structure of part A in FIG.

[0023] In the figure: 100, sample bottle of automatic water station; 1, water tank; 2, transparent cleaning box; 3, rectangular tube; 4, brake motor; 5, rectangular rod; 6, L-shaped pressure block; 7, anti-slip rubber block; 8, positioning sleeve; 9, sponge sleeve; 10, first electric push rod; 11, U-shaped tube; 12, pipe head; 13, one-way valve; 14, telescopic hose; 15, hot air blower; 16, water pump; 17, second electric push rod; 18, rectangular perforation. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figures 1 to 4 As shown, the present embodiment proposes a sample bottle cleaning device for an automatic water station, comprising a water tank 1, a transparent cleaning box 2 fixedly mounted on the top of the water tank 1, and a plurality of automatic water station sample bottles 100 arranged in the transparent cleaning box 2, wherein four legs are fixedly connected to the bottom of the transparent cleaning box 2 and the top of the water tank 1 in a rectangular shape, which plays the effect of raising and fixing the transparent cleaning box 2, a water supply pipe is connected and fixed to the top of the rear side of the water tank 1, the top of the transparent cleaning box 2 is set to be open, a brake motor 4 is fixedly mounted on the right top of the transparent cleaning box 2, the left end of the output shaft of the brake motor 4 extends into the transparent cleaning box 2 and is fixedly connected to a rectangular tube 3 with a blocking structure at the right end, a plurality of positioning sleeves 8 are fixedly connected to the top of the rectangular tube 3 at equal intervals, an adhesive sleeve in the positioning sleeve 8 is provided with a sponge sleeve 9 with an opening at the top, and a plurality of automatic water station sample bottles 100 are respectively movably inserted into the corresponding sponge sleeves 9, and a drain valve is connected and fixed to the bottom right side of the transparent cleaning box 2, and a plurality of sponge sleeves 9 are used for surrounding and positioning a plurality of automatic water station sample bottles 100 by simply inserting them downward;

[0026] A synchronous locking assembly is installed on the rectangular tube 3, which is in tight contact with the right sides of multiple water automatic station sample bottles 100. A first electric push rod 10, whose protruding end is rotatably connected to the synchronous locking assembly, is fixedly installed on the left side of the transparent cleaning box 2. The synchronous locking assembly is used to synchronously lock and prevent the multiple water automatic station sample bottles 100 from falling off when the first electric push rod 10 is started. The brake motor 4 is used to drive the rectangular tube 3 to rotate, and the rectangular tube 3 is used to drive the multiple fixed water automatic station sample bottles 100 to flip downward or rotate upward through multiple positioning sleeves 8;

[0027] The transparent cleaning box 2 is provided with a telescopic flushing and blowing component located below a plurality of water automatic station sample bottles 100. A water pump 16 is fixedly installed on the right side of the bottom of the transparent cleaning box 2. The water outlet of the water pump 16 is connected and fixed to the telescopic flushing and blowing component. The water inlet of the water pump 16 extends into the water tank 1 and is connected and fixed with a water suction pipe. An air guide hood connected and fixed to the telescopic flushing and blowing component is embedded and fixed on the left side of the bottom of the transparent cleaning box 2. An embedding hole fixedly connected to the outside of the air guide hood is opened on the left side of the bottom of the transparent cleaning box 2. The bottom of the air guide hood is connected and fixed with a hot air blower 15 with an air outlet at the top. The bottom of the transparent cleaning box 2 is fixedly installed with an extended end connected to the telescopic flushing and blowing component. The second electric push rod 17 is fixedly connected to the blowing assembly, wherein a circular through-hole is provided on the inner wall of the bottom of the transparent cleaning box 2, and a sealing ring is provided in the adhesive sleeve inside the circular through-hole. The inner side of the sealing ring is in movable contact with the outer side of the protruding end of the second electric push rod 17, so as to allow the protruding end of the second electric push rod 17 to pass through in a sealed manner. The telescopic flushing and blowing assembly is used to insert into multiple downward-facing water automatic station sample bottles 100 when the second electric push rod 17 is started, and is used to synchronously flush the interior of multiple water automatic station sample bottles 100 when the water pump 16 is started, and is also used to synchronously dry the interior of multiple water automatic station sample bottles 100 when the hot air blower 15 is started after flushing.

[0028] Specifically, the synchronous locking assembly includes a rectangular rod 5 slidably sleeved in the rectangular tube 3, and a plurality of L-shaped pressing blocks 6 are fixedly connected to the top of the rectangular rod 5. The top of the L-shaped pressing block 6 extends to the top of the rectangular tube 3, wherein the top of the rectangular tube 3 is provided with a plurality of rectangular through-holes 18, and the front inner wall and the rear inner wall of the rectangular through-hole 18 are respectively in movable contact with the front and rear sides of the corresponding L-shaped pressing blocks 6, so as to allow the L-shaped pressing blocks 6 to pass through. The left side of the L-shaped pressing block 6 is bonded and fixed with an anti-slip rubber block 7, and the left side of the anti-slip rubber block 7 is in tight contact with the right side of the corresponding water automatic station sample bottle 100, and the positioning sleeve 8 is movably sleeved on the corresponding L-shaped pressing block 6 On the top, the sponge cover 9 is movably sleeved on the corresponding anti-slip rubber block 7, and the left end of the rectangular rod 5 is rotatably connected to the protruding end of the first electric push rod 10, wherein the left end of the rectangular rod 5 is fixedly connected to a bearing, and the inner ring of the bearing is fixedly sleeved on the outer side of the protruding end of the first electric push rod 10, which has the effect of rotatably installing the rectangular rod 5; the set rectangular rod 5, L-shaped pressure block 6 and anti-slip rubber block 7 cooperate, and the first electric push rod 10 is used to drive the rectangular rod 5 to move left and right, and the rectangular rod 5 drives multiple anti-slip rubber blocks 7 to move left and right synchronously through multiple L-shaped pressure blocks 6, so as to achieve the effect of synchronously pressing and preventing multiple water automatic station sample bottles 100 from falling off to the left or synchronously unlocking them to the right.

[0029] Furthermore, the telescopic flushing and blowing assembly includes a U-shaped tube 11, the top of the U-shaped tube 11 is connected to and fixed with multiple tube heads 12, the tube heads 12 are located below the corresponding water automatic station sample bottles 100, and both ends of the bottom of the U-shaped tube 11 are connected and fixed with a one-way valve 13 with the top as the outlet, and the bottoms of the two one-way valves 13 are connected and fixed with a telescopic hose 14, the bottom end of the telescopic hose 14 on the right is connected and fixed with the water outlet of the water pump 16, and the bottom end of the telescopic hose 14 on the left is connected and fixed with the top of the air guide cover, and the inner top of the U-shaped tube 11 is fixedly connected to the protruding end of the second electric push rod 17; the U-shaped tube 11, tube head 12, one-way valve 13 and telescopic hose 14 are arranged to cooperate, and the second electric push rod 17 is used to drive the U-shaped tube 11 to move upward, and the U-shaped tube 11 drives the multiple tube heads 12 to insert upward into the corresponding downward-facing water automatic station sample bottles. In the bottle 100, the water pump 16 is used to extract the cleaning water in the water tank 1 and pump it into the U-shaped tube 11 through the telescopic hose 14 on the right and the one-way valve 13 on the right in turn. The water is sprayed into multiple water automatic station sample bottles 100 through multiple pipe heads 12 for flushing. By using the downward direction of the water automatic station sample bottles 100, the water supply can flow directly downward during flushing, forming a flow cleaning effect of automatic drainage, and using flowing water to facilitate better cleaning. After cleaning, the water pump 16 is turned off and the hot air blower 15 is turned on. The hot air blower 15 conveys hot air to the U-shaped tube 11 through the air guide cover, the telescopic hose 14 on the left and the one-way valve 13 on the left in turn. The hot air is blown into the corresponding water automatic station sample bottles 100 through multiple pipe heads 12 for drying, thereby achieving an integrated, convenient and fast drying effect after cleaning, reducing the waiting time for drying and improving work efficiency.

[0030] The method of using this embodiment is as follows: when in use, first, insert multiple water automatic station sample bottles 100 into the corresponding sponge sleeves 9 respectively, and then start the first electric push rod 10 in the reverse direction to drive the rectangular rod 5 to slide to the left in the rectangular tube 3, and the rectangular rod 5 drives the multiple anti-slip rubber blocks 7 to move to the left synchronously through the multiple L-shaped pressing blocks 6, and the multiple water automatic station sample bottles 100 are synchronously pressed and prevented from falling off, so as to achieve the effect of convenient and fast positioning and synchronous locking of the multiple water automatic station sample bottles 100. After fixing, start the brake motor 4 to drive the rectangular tube 3 to rotate, and the rectangular tube 3 drives the rectangular rod 5 to rotate. At the same time, the rectangular tube 3 drives the multiple fixed water automatic station sample bottles 100 to flip downward through the multiple positioning sleeves 8, so as to achieve the effect of automatically driving the multiple water automatic station sample bottles 100 to flip downward;

[0031] The U-shaped tube 11 is driven by the two one-way valves 13 to stretch the two telescopic hoses 14, and the water pump 16 is turned on to draw the cleaning water in the water tank 1 through the suction pipe, and the cleaning water is pumped into the U-shaped tube 11 through the telescopic hose 14 on the right and the one-way valve 13 on the right in turn. The water is sprayed into the multiple water automatic station sample bottles 100 through the multiple pipe heads 12 for flushing. With the water automatic station sample bottles 100 facing downward, the water can flow directly downward during flushing, forming a flow cleaning effect of automatic drainage. The flow water is used for better cleaning and improves the cleaning effect. The method of synchronously cleaning multiple water automatic station sample bottles 100 is used to improve the cleaning efficiency. In addition, with the water automatic station sample bottles 100 facing downward for flushing, there is no need for personnel to flip and pour out the water separately, which saves time and effort and improves the degree of automation.

[0032] After cleaning, the water pump 16 is turned off and the hot air blower 15 is turned on. The hot air blower 15 conveys hot air into the U-shaped tube 11 through the air guide cover, the telescopic hose 14 on the left and the one-way valve 13 on the left in turn. The hot air is blown into the corresponding water automatic station sample bottle 100 through multiple pipe heads 12 for drying, achieving the effect of integrated convenient and fast drying after cleaning, reducing the time for waiting for drying of residual water inside, and improving work efficiency; after drying, the second electric push rod 17 is reversely started to drive the U-shaped tube 11 to move downward, and the U-shaped tube 11 drives multiple pipe heads 12 to move downward, and the brake motor 4 can be started again to drive the rectangular tube 3 to rotate again, and the rectangular tube 3 drives multiple water automatic station sample bottles 100 to rotate upward through multiple positioning sleeves 8, and the first electric push rod 10 is started forward to drive the rectangular rod 5 to move right, and the rectangular rod 5 drives multiple anti-slip rubber blocks 7 to release the pressing work to the right through multiple L-shaped pressing blocks 6, so that the multiple water automatic station sample bottles 100 can be taken out upward.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sample bottle cleaning device for an automatic water station, comprising a water tank (1), a transparent cleaning box (2) fixedly mounted on the top of the water tank (1), and a plurality of automatic water station sample bottles (100) arranged in the transparent cleaning box (2), characterized in that: The top of the transparent cleaning box (2) is set to be open, and a brake motor (4) is fixedly installed on the top of the right side of the transparent cleaning box (2). The left end of the output shaft of the brake motor (4) extends into the transparent cleaning box (2) and is fixedly connected to a rectangular tube (3) with a blocking structure at the right end. A plurality of positioning sleeves (8) are fixedly connected to the top of the rectangular tube (3) at equal intervals. The adhesive sleeve inside the positioning sleeve (8) is provided with a sponge sleeve (9) with an open top. A plurality of water automatic station sample bottles (100) are respectively movably inserted into the corresponding sponge sleeves (9). The rectangular tube (3) is provided with a synchronous locking assembly that is in tight contact with the right sides of a plurality of water automatic station sample bottles (100); a first electric push rod (10) whose protruding end is rotatably connected to the synchronous locking assembly is fixedly provided on the left side of the transparent cleaning box (2); The transparent cleaning box (2) is provided with a telescopic flushing and blowing assembly located below a plurality of water automatic station sample bottles (100); a water pump (16) is fixedly installed on the right side of the bottom of the transparent cleaning box (2); the water outlet of the water pump (16) is connected and fixed with the telescopic flushing and blowing assembly; the water inlet of the water pump (16) extends into the water tank (1) and is connected and fixed with a water suction pipe; an air guide hood connected and fixed with the telescopic flushing and blowing assembly is embedded and fixed on the left side of the bottom of the transparent cleaning box (2); the bottom of the air guide hood is connected and fixed with a hot air blower (15) with an air outlet at the top; and a second electric push rod (17) is fixedly installed on the bottom of the transparent cleaning box (2), the protruding end of which is fixedly connected to the telescopic flushing and blowing assembly.

2. The sample bottle cleaning device of the automatic water station according to claim 1, characterized in that: The synchronous locking assembly includes a rectangular rod (5) slidably sleeved in the rectangular tube (3), a plurality of L-shaped pressing blocks (6) are fixedly connected to the top of the rectangular rod (5), the top of the L-shaped pressing block (6) extends to the top of the rectangular tube (3), an anti-slip rubber block (7) is bonded and fixed to the left side of the L-shaped pressing block (6), the left side of the anti-slip rubber block (7) is in tight contact with the right side of the corresponding water automatic station sample bottle (100), a positioning sleeve (8) is movably sleeved on the corresponding L-shaped pressing block (6), a sponge sleeve (9) is movably sleeved on the corresponding anti-slip rubber block (7), and the left end of the rectangular rod (5) is rotatably connected to the protruding end of the first electric push rod (10).

3. The sample bottle cleaning device of the automatic water station according to claim 2, characterized in that: The telescopic flushing assembly comprises a U-shaped tube (11), the top of the U-shaped tube (11) is connected and fixed with a plurality of tube heads (12), the tube heads (12) are located below the corresponding water automatic station sample bottles (100), both ends of the bottom of the U-shaped tube (11) are connected and fixed with a one-way valve (13) with the top as the outlet, the bottoms of the two one-way valves (13) are connected and fixed with a telescopic hose (14), the bottom end of the telescopic hose (14) on the right is connected and fixed with the water outlet of the water pump (16), the bottom end of the telescopic hose (14) on the left is connected and fixed with the top of the air guide cover, and the inner top of the U-shaped tube (11) is fixedly connected to the protruding end of the second electric push rod (17).

4. The sample bottle cleaning device of the automatic water station according to claim 1, characterized in that: The bottom right side of the transparent cleaning box (2) is connected to and fixed with a drain valve.

5. The sample bottle cleaning device of the automatic water station according to claim 1, characterized in that: Four legs are fixedly connected between the bottom of the transparent cleaning box (2) and the top of the water tank (1) in a rectangular shape.

6. The sample bottle cleaning device of the automatic water station according to claim 2, characterized in that: A plurality of rectangular through-holes (18) are provided on the top of the rectangular tube (3), and the front inner wall and the rear inner wall of the rectangular through-hole (18) are in active contact with the front side and the rear side of the corresponding L-shaped pressing block (6) respectively.

7. The sample bottle cleaning device of the automatic water station according to claim 1, characterized in that: A water supply pipe is connected and fixed to the top of the rear side of the water tank (1).

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