Automatic welding equipment for machining

Abstract

The invention relates to the technical field of machining equipment, in particular to automatic welding equipment for machining, which comprises a table body, a machining frame is fixedly mounted on the upper surface of the table body, a fan is fixedly mounted at the top of the machining frame, and a purification box is fixedly mounted at the top of the machining frame; a mounting groove is horizontally formed in the upper surface of the table body, hollow rods are fixedly mounted on the left side wall and the right side wall of the table body, inserting rods are slidably inserted into the through holes, the two inserting rods are slidably inserted into the two hollow rods respectively, a mounting block is fixedly mounted at one end of each inserting rod, and a frame door is fixedly mounted at the top end of each mounting block. The welding process can be carried out in a relatively closed space, welding smoke generated in the welding process is prevented from flying away arbitrarily, meanwhile, the fan is started, the welding smoke generated in the welding process can be sucked into the purification box, and the welding smoke is prevented from flying away into the atmosphere or being sucked by an operator to cause harm.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing equipment, and in particular to automatic welding equipment for mechanical processing. Background Art

[0002] Welding, also known as fusion, is a crucial process in the machining process. It is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. In the machining process, plates often need to be welded by welding equipment.

[0003] Existing welding equipment will produce toxic welding smoke during the welding process of plates. Since there is no mechanism to deal with the welding smoke, the welding smoke will float everywhere, which will not only harm the environment, but also have certain harm to the health of operators. Summary of the invention

[0004] The purpose of the present invention is to solve the following shortcomings in the prior art: the existing welding equipment will produce toxic welding smoke during the process of welding plates. Since there is no mechanism to deal with the welding smoke, the welding smoke will float everywhere, which will not only harm the environment but also have certain harm to the health of the operators. An automatic welding equipment for mechanical processing is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An automatic welding device for mechanical processing comprises a table, a processing frame is fixedly installed on the upper surface of the table, a welding mechanical arm is arranged on the top wall of the processing frame, a fan is fixedly installed on the top of the processing frame, an air inlet pipe of the fan penetrates into the processing frame, a purification box is fixedly installed on the top of the processing frame, and an air outlet pipe of the fan is connected to the purification box;

[0007] A mounting groove is horizontally provided on the upper surface of the platform body, and a hollow rod with a closed end is fixedly installed on the left and right side walls of the platform body. Through openings connected to the two hollow rods are respectively provided on the left and right groove walls of the mounting groove, and insertion rods are slidably inserted in the through openings. The two insertion rods are respectively slidably inserted in the two hollow rods, and a mounting block is fixedly installed on one end of the insertion rod, and a frame door is fixedly installed on the top of the mounting block.

[0008] Preferably, an observation port is provided on the surface of the frame door, and a transparent observation window is fixedly embedded in the observation port.

[0009] Preferably, a U-shaped handle is fixedly installed on the surface of the frame door, one of the handles is rotatably sleeved with a rotating ring and a torsion spring, an L-shaped limiting rod is fixedly installed on the outer ring wall of the rotating ring, and both ends of the torsion spring are fixedly connected to the rotating ring and the frame door respectively.

[0010] Preferably, a water tank is fixedly installed on the upper surface of the processing frame, the inserted rod sliding seal is inserted in the hollow rod, a water inlet pipe and a water outlet pipe are fixedly installed on the surface of the hollow rod, the end of the water inlet pipe away from the hollow rod is connected to the water tank, and a plurality of water distribution pipes are fixedly installed on the end of the water outlet pipe away from the hollow rod, the ends of the plurality of water distribution pipes are all inserted into the processing frame and fixedly installed with mist nozzles, and a first one-way valve is provided in the water inlet pipe and the water outlet pipe.

[0011] Preferably, a water collecting cavity is provided in the platform body, and a plurality of water holes which are all connected with the water collecting cavity are provided on the upper surface of the platform body.

[0012] Preferably, a reciprocating screw is vertically rotatably installed on the upper surface of the processing frame, a sliding block is threadedly sleeved on the reciprocating screw, a push rod is fixedly installed on the surface of the sliding block, a hollow tube is fixedly installed on the surface of the platform, a water suction pipe is fixedly installed on the wall of the water collecting chamber, the water suction pipe is connected with the hollow tube, the surface of the hollow tube is connected with the water tank through a return pipe, a second one-way valve is provided in both the water suction pipe and the return pipe, a piston rod is inserted in the sliding seal in the hollow tube, an L-shaped movable plate is fixedly installed on one end of the piston rod, an inclined plate is fixedly installed on the upper surface of the movable plate, an inclined mouth is opened on the surface of the inclined plate, the push rod passes through the inclined mouth, and the surface is in sliding contact with the wall of the inclined mouth, and the reciprocating screw is controlled to rotate by a transmission assembly.

[0013] Preferably, the transmission assembly includes two rotating shafts, two sprockets fixedly mounted on the two rotating shafts, a chain meshingly wound around the two sprockets, and rotating blades fixedly mounted on one of the rotating shafts. The rotating shaft fixedly mounted with the rotating blades is vertically rotatably installed in the air inlet duct of the fan through an installation component, and the other rotating shaft is vertically rotatably installed on the top wall of the processing frame, and the top end is fixedly connected to the bottom end of the reciprocating screw.

[0014] Preferably, the mounting component includes a swivel and two connecting rods symmetrically fixedly mounted on the outer ring wall of the swivel, the ends of the two connecting rods are fixedly connected to the inner wall of the air inlet pipe of the fan, and the swivel is rotatably sleeved on a rotating shaft fixedly sleeved with rotating blades.

[0015] Preferably, the conducting direction of the first one-way valve in the water inlet pipe is from the water tank to the hollow rod, the conducting direction of the first one-way valve in the water outlet pipe is from the hollow rod to the multiple water distribution pipes, the conducting direction of the second one-way valve in the water pumping pipe is from the water collecting chamber to the hollow tube, and the conducting direction of the second one-way valve in the return pipe is from the hollow tube to the water tank.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When welding, the two frame doors can be controlled to move closer to each other and abut against each other, so as to close the frame opening of the processing frame, so that the welding process can be carried out in a relatively closed space to prevent the welding smoke generated during the welding process from drifting freely. At the same time, the fan can be started to suck the welding smoke generated during the welding process into the purification box to prevent the welding smoke from drifting into the atmosphere or being inhaled by the operator, causing harm;

[0018] 2. When the two frame doors are controlled to move away from each other, it means that the welding of the plate is completed. At this time, the cooling water in the water tank will be sprayed out from multiple mist nozzles and act on the surface of the welded plate to cool the weld. This can shorten the residence time of the welding area at high temperature and avoid overheating from having serious adverse effects on material properties;

[0019] 3. The cooling water sprayed from the mist nozzle will enter the water collecting chamber from multiple water holes, so as to achieve the effect of collecting cooling water. In the welding process, the cooling water in the water collecting chamber will be reciprocatingly pumped into the water storage tank, which is convenient for recycling the collected cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a front three-dimensional partial cross-sectional structure of an automatic welding device for mechanical processing proposed by the present invention;

[0021] Figure 2 This is a schematic diagram of the back three-dimensional structure of an automatic welding device for mechanical processing proposed by the present invention;

[0022] Figure 3 This is a top view of a three-dimensional structure diagram of an automatic welding device for mechanical processing proposed by the present invention;

[0023] Figure 4 This is a bottom-up stereoscopic structural diagram of an automatic welding device for mechanical processing proposed by the present invention;

[0024] Figure 5 This is a partial three-dimensional structural schematic diagram of a middle frame door of an automatic welding device for mechanical processing proposed by the present invention;

[0025] Figure 6 It is a partial three-dimensional structural schematic diagram of a rotating ring and a limiting rod in an automatic welding device for mechanical processing proposed by the present invention;

[0026] Figure 7 for Figure 1 The enlarged structural diagram at A in the middle;

[0027] Figure 8 for Figure 3 The enlarged structural diagram at B in the middle;

[0028] Fig. 9 for Figure 4 Enlarged structural diagram at point C in the middle.

[0029] In the figure: 1 body, 2 processing frame, 3 welding robot arm, 4 fan, 5 purification box, 6 hollow rod, 7 plug rod, 8 mounting block, 9 frame door, 10 observation window, 11 handle, 12 rotating ring, 13 torsion spring, 14 limiting rod, 15 water storage tank, 16 water inlet pipe, 17 water outlet pipe, 18 water distribution pipe, 19 mist nozzle, 20 water collecting chamber, 21 water through hole, 22 reciprocating screw rod, 23 slider, 24 push rod, 25 hollow pipe, 26 pumping pipe, 27 return pipe, 28 piston rod, 29 moving plate, 30 inclined plate, 31 oblique mouth, 32 rotating shaft, 33 sprocket, 34 rotating blade, 35 rotating ring, 36 chain. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1-Figure 9 An automatic welding equipment for mechanical processing includes a table 1, a processing frame 2 is fixedly installed on the upper surface of the table 1, a welding robot arm 3 is provided on the top wall of the processing frame 2, a fan 4 is fixedly installed on the top of the processing frame 2, an air inlet pipe of the fan 4 penetrates into the processing frame 2, a purification box 5 is fixedly installed on the top of the processing frame 2 (the purification box 5 and the welding robot arm 3 are both existing technologies, and their working principles are not described in detail here), and the air outlet pipe of the fan 4 is connected to the purification box 5.

[0032] A mounting groove is horizontally provided on the upper surface of the platform body 1, and a hollow rod 6 with a closed end is fixedly installed on the left and right side walls of the platform body 1. Through openings connected to the two hollow rods 6 are respectively provided on the left and right groove walls of the mounting groove, and insertion rods 7 are slidably inserted in the through openings. The two insertion rods 7 are respectively slidably inserted in the two hollow rods 6, and a mounting block 8 is fixedly installed on one end of the insertion rod 7, and a frame door 9 is fixedly installed on the top of the mounting block 8.

[0033] When it is necessary to weld the plate, first place the plate in the processing frame 2, place it on the upper surface of the table 1, and fix it. Then control the two frame doors 9 to approach each other. At this time, the two insertion rods 7 will approach each other until the two frame doors 9 abut against each other, and then the frame opening of the processing frame 2 can be closed. Then, the welding robot arm 3 can be started to weld the plate, so that the welding process is carried out in a relatively closed space to prevent the welding smoke generated during the welding process from drifting away at will. At the same time, start the fan 4 to suck the welding smoke generated during the welding process into the air inlet pipe, and then discharge the welding smoke from the air outlet pipe to the purification box 5 to purify the welding smoke to prevent the welding smoke from directly drifting into the atmosphere or being inhaled by the operator to cause harm to the environment or human body.

[0034] An observation port is provided on the surface of the frame door 9 , and a transparent observation window 10 is fixedly embedded in the observation port. When the two frame doors 9 are butted against each other, the operator can also observe the welding process through the observation window 10 .

[0035] A U-shaped handle 11 is fixedly installed on the surface of the frame door 9, one of the handles 11 is rotatably sleeved with a rotating ring 12 and a torsion spring 13, an L-shaped limiting rod 14 is fixedly installed on the outer ring wall of the rotating ring 12, and both ends of the torsion spring 13 are fixedly connected to the rotating ring 12 and the frame door 9 respectively.

[0036] The handle 11 is convenient for the operator to control the movement of the two frame doors 9, and the limiting rod 14 is initially horizontal under the elastic potential energy of the torsion spring 13. When the two frame doors 9 need to be controlled to approach each other, the rotating ring 12 needs to be controlled to rotate with the limiting rod 14, so that the end of the limiting rod 14 away from the rotating ring 12 rotates upward until the two frame doors 9 abut against each other. At this time, the rotating ring 12 is released, and the rotating ring 12 will quickly rotate and reset with the limiting rod 14 under the elastic potential energy of the torsion spring 13, and the end of the limiting rod 14 after reset will be clamped with the other handle 11, thereby limiting the movement of the two frame doors 9, that is, simply locking the two frame doors 9 after abutting against each other, and when it needs to be unlocked, it is only necessary to control the rotating ring 12 to rotate with the limiting rod 14, so that the limiting rod 14 is rotated until it is no longer released from the handle 11.

[0037] A water storage tank 15 is fixedly installed on the upper surface of the processing frame 2, and the insertion rod 7 is inserted in the hollow rod 6 in a sliding and sealing manner. A water inlet pipe 16 and a water outlet pipe 17 are fixedly installed on the surface of the hollow rod 6. The end of the water inlet pipe 16 away from the hollow rod 6 is connected to the water storage tank 15, and the end of the water outlet pipe 17 away from the hollow rod 6 is fixedly installed with multiple water distribution pipes 18. The ends of the multiple water distribution pipes 18 are all inserted into the processing frame 2 and are fixedly installed with mist nozzles 19. A first one-way valve is provided in the water inlet pipe 16 and the water outlet pipe 17. The conducting direction of the first one-way valve in the water inlet pipe 16 is from the water storage tank 15 to the hollow rod 6, and the conducting direction of the first one-way valve in the water outlet pipe 17 is from the hollow rod 6 to the multiple water distribution pipes 18.

[0038] When the two frame doors 9 are controlled to move closer to each other, the plug rod 7 will also move inside the hollow rod 6, the space volume between the end of the plug rod 7 and the inner wall of the hollow rod 6 will increase, the pressure will decrease, and the cooling water in the water tank 15 will enter the hollow rod 6 from the water inlet pipe 16. When the welding is completed and the two frame doors 9 are controlled to move away from each other, the space volume between the end of the plug rod 7 and the inner wall of the hollow rod 6 will decrease, the pressure will increase, and the cooling water in the hollow rod 6 will enter the water outlet pipe 17 from the hollow rod 6 and be sprayed out in the form of mist from the mist nozzle 19 at the end of the multiple water distribution pipes 18. The water mist will act on the surface of the welded plate to cool the weld, which can shorten the residence time of the welding area at high temperature and avoid overheating from having serious adverse effects on material properties.

[0039] A water collecting chamber 20 is provided in the platform body 1 , and a plurality of water holes 21 which are connected to the water collecting chamber 20 are provided on the upper surface of the platform body 1 , and filters are provided in the water holes 21 .

[0040] Part of the water sprayed from the mist nozzle 19 will enter the water collecting chamber 20 from the water through hole 21, so that the water resources are collected, and the filter can filter the impurities in the water.

[0041] A reciprocating screw 22 is vertically rotatably installed on the upper surface of the processing frame 2, a slider 23 is threadedly sleeved on the reciprocating screw 22, a push rod 24 is fixedly installed on the surface of the slider 23, a hollow tube 25 is fixedly installed on the surface of the platform 1, a pumping pipe 26 is fixedly installed on the wall of the water collecting chamber 20, the pumping pipe 26 is connected with the hollow tube 25, the surface of the hollow tube 25 is connected with the water storage tank 15 through a return pipe 27, a second one-way valve is arranged in both the pumping pipe 26 and the return pipe 27, the conduction direction of the second one-way valve in the pumping pipe 26 is from the water collecting chamber 20 to the hollow tube 25, the conduction direction of the second one-way valve in the return pipe 27 is from the hollow tube 25 to the water storage tank 15, a piston rod 28 is inserted in the hollow tube 25 as a sliding seal, an L-shaped moving plate 29 is fixedly installed on one end of the piston rod 28, an inclined plate 30 is fixedly installed on the upper surface of the moving plate 29, and a surface of the inclined plate 30 is provided with The beveled opening 31, the push rod 24 passes through the beveled opening 31, and the surface is in sliding contact with the wall of the beveled opening 31. The reciprocating screw rod 22 is controlled to rotate by a transmission assembly. The transmission assembly includes two rotating shafts 32, two sprocket wheels 33 respectively fixedly sleeved on the two rotating shafts 32, a chain 36 meshing and winding on the two sprocket wheels 33, and a rotating blade 34 fixedly sleeved on one of the rotating shafts 32. The rotating shaft 32 fixedly sleeved with the rotating blade 34 is vertically rotatably installed in the air inlet pipe of the fan 4 through an installation component, and the other rotating shaft 32 is vertically rotatably installed on the inner top wall of the processing frame 2, and the top end is fixedly connected to the bottom end of the reciprocating screw rod 22. The installation component includes a swivel 35 and two connecting rods symmetrically fixedly installed on the outer ring wall of the swivel 35. The ends of the two connecting rods are fixedly connected to the inner wall of the air inlet pipe of the fan 4, and the swivel 35 is rotatably sleeved on the rotating shaft 32 fixedly sleeved with the rotating blade 34.

[0042] When the fan 4 is started and welding smoke enters the air inlet pipe of the fan 4 at a high speed, the rotating blades 34 will drive one of the rotating shafts 32 to rotate, and under the action of the two sprockets 33 and the chain 36, the other rotating shaft 32 will drive the reciprocating screw 22 to rotate, and the slider 23 threadedly sleeved on the reciprocating screw 22 will drive the push rod 24 to move vertically back and forth in the inclined opening 31. When the push rod 24 moves up, the moving plate 29 will be pressed by the wall of the inclined opening 31 and the surface of the push rod 24, and the piston rod 28 will move closer to the platform 1. The volume of the space in the tube 25 will decrease and the pressure will increase at this time, and the water in the hollow tube 25 will enter the water storage tank 15 from the return pipe 27. When the push rod 24 moves downward, the movable plate 29 will be pressed by the wall of the inclined opening 31 and the surface of the push rod 24, and the piston rod 28 will move toward the direction away from the platform 1. The volume of the space in the hollow tube 25 will increase and the pressure will decrease at this time, and the water in the water collecting chamber 20 will enter the hollow tube 25 from the pumping pipe 26. This reciprocating process can achieve the effect of recycling the collected cooling water.

[0043] In the present invention, when it is necessary to weld the plate, the plate is first placed in the processing frame 2, placed on the upper surface of the table 1, and fixed. Then, the two frame doors 9 are controlled to approach each other. At this time, the two insertion rods 7 will approach each other until the two frame doors 9 are against each other, and the frame opening of the processing frame 2 can be closed. Then, the welding robot arm 3 is started to weld the plate, so that the welding process is carried out in a relatively closed space to prevent the welding smoke generated during the welding process from drifting away at will. At the same time, the fan 4 is started to suck the welding smoke generated during the welding process into the air inlet pipe, and then the welding smoke is discharged from the air outlet pipe to the purification box 5 to purify the welding smoke to prevent the welding smoke from directly drifting into the atmosphere or being inhaled by the operator to cause harm to the environment or human body.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic welding device for mechanical processing, comprising a table (1), characterized in that: A processing frame (2) is fixedly mounted on the upper surface of the platform (1), a welding mechanical arm (3) is provided on the inner top wall of the processing frame (2), a fan (4) is fixedly mounted on the top of the processing frame (2), an air inlet pipe of the fan (4) penetrates into the processing frame (2), a purification box (5) is fixedly mounted on the top of the processing frame (2), and an air outlet pipe of the fan (4) is connected to the purification box (5); The upper surface of the platform (1) is horizontally provided with a mounting groove, and the left and right side walls of the platform (1) are both fixedly provided with a hollow rod (6) with a closed end, and the left and right groove walls of the mounting groove are respectively provided with a through opening connected with the two hollow rods (6), and an insertion rod (7) is slidably inserted in the through opening, and the two insertion rods (7) are respectively slidably inserted in the two hollow rods (6), and a mounting block (8) is fixedly installed at one end of the insertion rod (7), and a frame door (9) is fixedly installed at the top of the mounting block (8).

2. The automatic welding equipment for mechanical processing according to claim 1, characterized in that: An observation port is provided on the surface of the frame door (9), and a transparent observation window (10) is fixedly embedded in the observation port.

3. The automatic welding equipment for mechanical processing according to claim 1, characterized in that: A U-shaped handle (11) is fixedly mounted on the surface of the frame door (9), one of the handles (11) is rotatably sleeved with a rotating ring (12) and sleeved with a torsion spring (13), an L-shaped limiting rod (14) is fixedly mounted on the outer ring wall of the rotating ring (12), and the two ends of the torsion spring (13) are respectively fixedly connected to the rotating ring (12) and the frame door (9).

4. The automatic welding equipment for mechanical processing according to claim 1, characterized in that: A water storage tank (15) is fixedly mounted on the upper surface of the processing frame (2); the insertion rod (7) is inserted in the hollow rod (6) in a sliding and sealing manner; a water inlet pipe (16) and a water outlet pipe (17) are fixedly mounted on the surface of the hollow rod (6); one end of the water inlet pipe (16) away from the hollow rod (6) is connected to the water storage tank (15); one end of the water outlet pipe (17) away from the hollow rod (6) is fixedly mounted with a plurality of water distribution pipes (18); the ends of the plurality of water distribution pipes (18) are all inserted into the processing frame (2) and are all fixedly mounted with mist nozzles (19); and a first one-way valve is provided in each of the water inlet pipe (16) and the water outlet pipe (17).

5. The automatic welding equipment for mechanical processing according to claim 4, characterized in that: A water collecting chamber (20) is provided in the platform body (1), and a plurality of water holes (21) which are all connected to the water collecting chamber (20) are provided on the upper surface of the platform body (1).

6. The automatic welding equipment for mechanical processing according to claim 5, characterized in that: A reciprocating screw (22) is vertically rotatably mounted on the upper surface of the processing frame (2), a slider (23) is threadedly sleeved on the reciprocating screw (22), a support rod (24) is fixedly mounted on the surface of the slider (23), a hollow tube (25) is fixedly mounted on the surface of the platform (1), a water extraction pipe (26) is fixedly mounted on the wall of the water collecting chamber (20), the water extraction pipe (26) is connected to the hollow tube (25), the surface of the hollow tube (25) is connected to the water storage tank (15) via a water return pipe (27), and the water extraction pipe (26) is connected to the water collection chamber (20). A second one-way valve is provided in both the water pipe (26) and the return pipe (27). A piston rod (28) is inserted in a sliding seal in the hollow pipe (25). An L-shaped moving plate (29) is fixedly installed at one end of the piston rod (28). An inclined plate (30) is fixedly installed on the upper surface of the moving plate (29). An inclined opening (31) is provided on the surface of the inclined plate (30). The stop rod (24) passes through the inclined opening (31), and its surface is in sliding contact with the wall of the inclined opening (31). The reciprocating screw rod (22) is controlled to rotate by a transmission assembly.

7. The automatic welding equipment for mechanical processing according to claim 6, characterized in that: The transmission assembly comprises two rotating shafts (32), two sprocket wheels (33) respectively fixedly sleeved on the two rotating shafts (32), a chain (36) meshed and wound around the two sprocket wheels (33), and a rotating blade (34) fixedly sleeved on one of the rotating shafts (32); the rotating shaft (32) fixedly sleeved with the rotating blade (34) is vertically rotatably mounted in the air inlet pipe of the fan (4) through a mounting component; the other rotating shaft (32) is vertically rotatably mounted on the inner top wall of the processing frame (2), and the top end is fixedly connected to the bottom end of the reciprocating screw rod (22).

8. The automatic welding equipment for mechanical processing according to claim 7, characterized in that: The mounting component comprises a rotating ring (35) and two connecting rods symmetrically fixedly mounted on the outer ring wall of the rotating ring (35), the ends of the two connecting rods being fixedly connected to the inner wall of the air inlet pipe of the fan (4), and the rotating ring (35) being rotatably sleeved on a rotating shaft (32) on which rotating blades (34) are fixedly sleeved.

9. The automatic welding equipment for mechanical processing according to claim 6, characterized in that: The conducting direction of the first one-way valve in the water inlet pipe (16) is from the water storage tank (15) to the hollow rod (6), the conducting direction of the first one-way valve in the water outlet pipe (17) is from the hollow rod (6) to the multiple water distribution pipes (18), the conducting direction of the second one-way valve in the water pumping pipe (26) is from the water collecting chamber (20) to the hollow pipe (25), and the conducting direction of the second one-way valve in the water return pipe (27) is from the hollow pipe (25) to the water storage tank (15).

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