Iron ore beneficiation sewage treatment device

Abstract

The invention discloses an iron ore beneficiation sewage treatment device, and relates to the technical field of iron ore beneficiation sewage treatment, according to the technical scheme, the iron ore beneficiation sewage treatment device comprises a treatment tank, and a filtering control mechanism and a feeding mechanism are arranged in the treatment tank; the filtering control mechanism comprises a second bottom plate, the second bottom plate is fixedly arranged on one side of the treatment tank, a first motor is fixedly arranged at the top of the second bottom plate, the output end of the first motor is fixedly connected with a transmission shaft, the transmission shaft extends into the treatment tank and is connected with the inner wall of the treatment tank through a bearing, the transmission shaft is sleeved with a base, and a groove is formed in one side of the transmission shaft; the sewage treatment device has the beneficial effects that the filtering effect is enhanced, the problem that a traditional filtering structure is easy to block is avoided, automatic feeding of a coagulant is realized through the design of a pump machine and a feeding mechanism, the feeding amount and the feeding time are controllable, rapid and uniform mixing of sewage and the coagulant is ensured in combination with stirring blades driven by a third motor, the coagulation effect is improved, and the sewage treatment effect is improved. The sewage treatment quality is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of iron ore beneficiation wastewater treatment, and in particular to an iron ore beneficiation wastewater treatment device. Background Art

[0002] The wastewater generated during the iron ore beneficiation process has complex composition, containing high concentrations of suspended matter (such as ore powder, clay), heavy metal ions (Fe, Mn, Pb, etc.) and residual beneficiation agents (such as xanthate and black medicine).

[0003] The existing method accelerates sedimentation by adding coagulants and separates solids by using filtering structures, which makes it easy to clog and requires frequent maintenance. The steps of adding chemicals and discharging slag rely on manual operations. Summary of the invention

[0004] To this end, the present invention provides an iron ore dressing wastewater treatment device to solve the problems of easy clogging and frequent maintenance, and the dosing and slag discharge links relying on manual operation.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: an iron ore beneficiation wastewater treatment device, comprising a treatment tank, wherein a filtering control mechanism and a feeding mechanism are provided inside the treatment tank; The filtration control mechanism includes a second bottom plate, which is fixed on one side of the processing tank, a first motor is fixed on the top of the second bottom plate, a transmission shaft is fixedly connected to the output end of the first motor, the transmission shaft extends into the processing tank and is connected to the inner wall of the processing tank through a bearing, a base is sleeved on the outside of the transmission shaft, a groove is opened on one side of the transmission shaft, the transmission shaft is slidably connected to the base, a filter box is fixed on the top of the base, and a control component is provided on one side of the filter box.

[0006] Preferably, the control component includes a fixed frame, which is fixedly arranged on one side of the processing tank, a second motor is fixedly arranged on one side of the fixed frame, a reciprocating screw is fixedly connected to the output end of the second motor, one end of the reciprocating screw is connected to the outer wall of the processing tank through a bearing, a limit rod is fixedly arranged between the fixed frame and the processing tank, the limit rod passes through a circular plate and is slidably connected to the circular plate, a circular plate is sleeved on the outside of the reciprocating screw, the reciprocating screw and the circular plate are connected through a ball screw pair, a slide rail is opened on one side of the circular plate, a sliding block is arranged inside the slide rail, a guide rod is fixedly arranged on one side of the sliding block, and one end of the guide rod is fixedly connected to the filter box.

[0007] Preferably, the side wall of the processing tank is provided with an arc-shaped slide groove, and the guide rod passes through the arc-shaped slide groove and is slidably connected to the arc-shaped slide groove.

[0008] Preferably, the feeding mechanism includes a first bottom plate, which is fixedly arranged on one side of the processing tank, a pump is fixedly arranged on the top of the first bottom plate, a delivery pipe is fixedly connected to the output end of the pump, the delivery pipe extends into the interior of the processing tank, two shunt pipes are fixedly arranged at the bottom of the delivery pipe, a feeding shell is fixedly arranged at the bottom of the two shunt pipes, a discharge port is opened at the bottom of the feeding shell, a connecting shell is fixedly arranged on one side of the feeding shell, a rotating shaft is connected to the inside of the feeding shell through a bearing, the rotating shaft extends into the interior of the connecting shell and is connected to the inner wall of the connecting shell through a bearing, a feeding impeller is fixedly sleeved on the outside of the rotating shaft, the feeding impeller is arranged in the interior of the feeding shell, a gear is fixedly sleeved on the outside of the rotating shaft, a tooth plate is provided on one side of the gear, the tooth plate is meshed with the gear, the tooth plate passes through the connecting shell and is slidably connected to the connecting shell, a connecting plate is fixedly arranged on one side of the tooth plate, the connecting plate is sleeved on the outside of the transmission shaft and is slidably connected to the transmission shaft, and the connecting plate is connected to the base through a bearing.

[0009] Preferably, a connecting rod is fixedly provided on one side of the feeding shell and the connecting shell, and the connecting rod is fixedly connected to the inner wall of the processing tank.

[0010] Preferably, a third motor is fixedly provided at the bottom of the processing tank, a rotating rod is fixedly connected to the output end of the third motor, a plurality of stirring blades are fixedly provided on the outer surface of the rotating rod, and two scrapers are fixedly provided on the outer surface of the rotating rod.

[0011] Preferably, two filter screens are embedded in the bottom of the processing tank, two material discharge shells are fixedly provided at the bottom of the processing tank, and material discharge pipes are fixedly provided at the bottom of the two material discharge shells.

[0012] Preferably, a slag discharge pipe is fixedly provided at the bottom of the processing tank, and a plurality of supporting legs are fixedly provided at the bottom of the processing tank.

[0013] Preferably, a feed pipe is fixedly provided on the top of the processing tank.

[0014] Preferably, a slag discharge port is fixedly provided on one side of the processing tank.

[0015] The embodiments of the present invention have the following advantages: The first motor controls the rotation and reciprocating motion of the filter box, which effectively improves the sewage treatment efficiency and reduces the reliance on manual operation. At the same time, the reciprocating screw mechanism driven by the second motor enables the filter box to swing back and forth, which enhances the filtering effect and avoids the problem of easy clogging of the traditional filtering structure. Not only is the filter box set for preliminary large particle filtration, but also the filter screen is used for secondary fine impurity interception to ensure the quality of the treated water. At the same time, the design of the scraper effectively prevents the filter screen from clogging, and the setting of the slag discharge pipe and slag discharge port facilitates the cleaning of accumulated impurities and reduces the maintenance frequency. Through the design of the pump and feeding mechanism, automatic feeding of coagulant is realized, and the feeding amount and feeding timing are controllable. Combined with the stirring blade driven by the third motor, rapid and uniform mixing of sewage and coagulant is ensured, the coagulation effect is improved, and the quality of sewage treatment is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0018] Figure 1 The front view of the overall structure provided by the present invention; Figure 2 The overall structure provided by the present invention is a side view Figure 1 ; Figure 3 The overall structure provided by the present invention is a side view Figure 2 ; Figure 4 A side sectional view of the overall structure provided by the present invention; Figure 5 A front cross-sectional view of the overall structure provided by the present invention; Figure 6 A three-dimensional diagram of the filter box provided by the present invention; Figure 7 A cross-sectional view of a connection shell provided by the present invention; Figure 8 A cross-sectional view of a feed shell provided by the present invention; Fig. 9 A top sectional view of a treatment tank provided by the present invention; Fig.10 The present invention provides Figure 4 A magnified view of the structure of the middle part A; Fig.11 The present invention provides Figure 5 Enlarged view of the structure of part B in the middle.

[0019] In the figure: 1, treatment tank; 2, feed pipe; 3, slag discharge pipe; 4, discharge shell; 5, discharge pipe; 6, support leg; 7, first bottom plate; 8, pump; 9, second bottom plate; 10, first motor; 11, fixed frame; 12, slag discharge port; 13, second motor; 14, limit rod; 15, reciprocating screw; 16, round plate; 17, guide rod; 18, slide rail; 19, arc slide; 20, slide block ; 21. Drive shaft; 22. Filter box; 23. Connecting rod; 24. Scraper; 25. Third motor; 26. Rotating rod; 27. Stirring blade; 28. Filter screen; 29. ​​Delivery pipe; 30. Diverter pipe; 31. Base; 32. Connecting plate; 33. Feeding shell; 34. Discharge port; 35. Connecting shell; 36. Tooth plate; 37. Gear; 38. Rotating shaft; 39. Feeding impeller; 40. Groove. DETAILED DESCRIPTION

[0020] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0021] Refer to the attached Figure 1 -Attached Fig.11 , the present invention provides an iron ore dressing wastewater treatment device, comprising a treatment tank 1, wherein a filtering control mechanism and a feeding mechanism are provided inside the treatment tank 1; The filtering control mechanism includes a second bottom plate 9, which is fixedly arranged on one side of the processing tank 1, and a first motor 10 is fixedly arranged on the top of the second bottom plate 9. A transmission shaft 21 is fixedly connected to the output end of the first motor 10, and the transmission shaft 21 extends into the processing tank 1 and is connected to the inner wall of the processing tank 1 through a bearing. A base 31 is sleeved on the outside of the transmission shaft 21, and a groove 40 is opened on one side of the transmission shaft 21. The transmission shaft 21 is slidably connected to the base 31, and a filter box 22 is fixedly arranged on the top of the base 31. A control component is arranged on one side of the filter box 22, and the control component includes a fixing frame 11, and the fixing frame 11 is fixedly arranged on one side of the processing tank 1. A second motor 13 is fixedly arranged on one side of the fixing frame 11. The first motor 13 is fixedly arranged on one side of the fixing frame 11. A reciprocating screw 15 is fixedly connected to the output end of the second motor 13, one end of the reciprocating screw 15 is connected to the outer wall of the processing tank 1 through a bearing, a limit rod 14 is fixedly provided between the fixed frame 11 and the processing tank 1, the limit rod 14 penetrates the circular plate 16 and is slidably connected to the circular plate 16, a circular plate 16 is sleeved on the outside of the reciprocating screw 15, the reciprocating screw 15 and the circular plate 16 are connected through a ball screw pair, a slide rail 18 is provided on one side of the circular plate 16, a sliding block 20 is provided inside the slide rail 18, a guide rod 17 is fixedly provided on one side of the sliding block 20, one end of the guide rod 17 is fixedly connected to the filter box 22, an arc-shaped slide groove 19 is provided on the side wall of the processing tank 1, the guide rod 17 penetrates the arc-shaped slide groove 19 and is slidably connected to the arc-shaped slide groove 19; In this embodiment, the filter box 22 is tilted toward the closed end, the second motor 13 is started, the second motor 13 controls the reciprocating screw 15 to rotate, the reciprocating screw 15 controls the circular plate 16 to reciprocate, the circular plate 16 drives the sliding block 20 and the guide rod 17 to reciprocate, the guide rod 17 drives the filter box 22 to reciprocate, and the sewage is injected into the treatment tank 1 through the feed pipe 2, the sewage falls on the filter box 22, and the filter box 22 is shaken so that the large particles of ore slag in the sewage are retained in the filter box 22, and the filtered sewage falls on the bottom of the treatment tank 1; Among them, in order to achieve the purpose of feeding, the present device is implemented by the following technical solutions: the feeding mechanism includes a first bottom plate 7, the first bottom plate 7 is fixedly arranged on one side of the processing tank 1, a pump 8 is fixedly arranged on the top of the first bottom plate 7, a delivery pipe 29 is fixedly connected to the output end of the pump 8, the delivery pipe 29 extends into the interior of the processing tank 1, two shunt pipes 30 are fixedly arranged at the bottom of the delivery pipe 29, a feeding shell 33 is fixedly arranged at the bottom of the two shunt pipes 30, a discharge port 34 is opened at the bottom of the feeding shell 33, a connecting shell 35 is fixedly arranged on one side of the feeding shell 33, a rotating shaft 38 is connected to the inside of the feeding shell 33 through a bearing, the rotating shaft 38 extends into the interior of the connecting shell 35 and is connected to the inner wall of the connecting shell 35 through a bearing, a feeding impeller 39 is fixedly sleeved on the outside of the rotating shaft 38, the feeding impeller 39 is arranged in the interior of the feeding shell 33, a gear 37 is fixedly sleeved on the outside of the rotating shaft 38, a toothed plate 36 is arranged on one side of the gear 37, and the gear The plate 36 is meshed with the gear 37, the tooth plate 36 penetrates the connecting shell 35 and is slidably connected to the connecting shell 35, a connecting plate 32 is fixedly arranged on one side of the tooth plate 36, the connecting plate 32 is sleeved on the outside of the transmission shaft 21 and is slidably connected to the transmission shaft 21, the connecting plate 32 is connected to the base 31 through a bearing, the feeding shell 33 and the connecting shell 35 are both fixedly provided with a connecting rod 23 on one side, the connecting rod 23 is fixedly connected to the inner wall of the processing tank 1, and is connected to the coagulant tank through the input end of the pump 8 , the coagulant is transported to the transport pipe 29, and transported to the feed shell 33 through the shunt pipe 30. The filter box 22 and the base 31 make reciprocating motions while driving the connecting plate 32 to make reciprocating motions. The connecting plate 32 drives the tooth plate 36 to make reciprocating motions. The tooth plate 36 drives the gear 37 to rotate. The gear 37 drives the rotating shaft 38 to rotate. The rotating shaft 38 drives the feeding impeller 39 to rotate, thereby discontinuously outputting the coagulant. The coagulant is discharged through the discharge port 34 and falls into the inside of the treatment tank 1 and contacts the sewage. Among them, in order to achieve the purpose of mixing, the present device is implemented by the following technical scheme: a third motor 25 is fixedly provided at the bottom of the treatment tank 1, a rotating rod 26 is fixedly connected to the output end of the third motor 25, a plurality of stirring blades 27 are fixedly provided on the outer surface of the rotating rod 26, two scrapers 24 are fixedly provided on the outer surface of the rotating rod 26, two filter screens 28 are embedded at the bottom of the treatment tank 1, two discharge shells 4 are fixedly provided at the bottom of the treatment tank 1, and a discharge pipe 5 is fixedly provided at the bottom of the two discharge shells 4. The third motor 25 is started, and the third motor 25 controls the rotation of the rotating rod 26, and the rotating rod 26 drives the stirring blades 27 to rotate. The stirring blades 27 rotate and stir the sewage, so that the sewage and the coagulant are quickly mixed. A valve is provided on the discharge pipe 5. The valve at the discharge pipe 5 is opened to discharge the treated sewage, and the coagulated impurities are intercepted by the filter screen 28. At the same time, the scraper 24 is driven to rotate by the rotating rod 26, and the scraper 24 scrapes off the impurities on the surface of the filter screen 28 to prevent the impurities from blocking the filter screen 28. Among them, in order to achieve the purpose of impurities removal, the present device is implemented by adopting the following technical scheme: a slag discharge pipe 3 is fixedly provided at the bottom of the processing tank 1, a plurality of supporting legs 6 are fixedly provided at the bottom of the processing tank 1, a feeding pipe 2 is fixedly provided at the top of the processing tank 1, a slag discharge port 12 is fixedly provided on one side of the processing tank 1, the valve at the slag discharge pipe 3 is opened, impurities are discharged through the slag discharge pipe 3, the processing tank 1 is supported by the supporting legs 6, and the large particles of ore slag on the filter box 22 fall into the slag discharge port 12 and are discharged through the slag discharge port 12.

[0022] The use process of the present invention is as follows: When using the present invention, Figure 5 As shown, the filter box 22 is tilted toward the closed mouth, the second motor 13 is started, the second motor 13 controls the reciprocating screw 15 to rotate, the reciprocating screw 15 controls the circular plate 16 to reciprocate, the circular plate 16 drives the sliding block 20 and the guide rod 17 to reciprocate, the guide rod 17 drives the filter box 22 to reciprocate, and the sewage is injected into the treatment tank 1 through the feed pipe 2, the sewage falls on the filter box 22, and the filter box 22 is shaken so that the large particles of ore slag in the sewage are retained in the filter box 22, and the filtered sewage falls on the bottom of the treatment tank 1, and the coagulant tank is connected through the input end of the pump 8 to deliver the coagulant to The conveying pipe 29 is conveyed to the feed shell 33 through the shunt pipe 30. The filter box 22 and the base 31 make reciprocating motions while driving the connecting plate 32 to make reciprocating motions. The connecting plate 32 drives the tooth plate 36 to make reciprocating motions. The tooth plate 36 drives the gear 37 to rotate. The gear 37 drives the rotating shaft 38 to rotate. The rotating shaft 38 drives the conveying impeller 39 to rotate, thereby discontinuously outputting the coagulant. The coagulant is discharged through the discharge port 34 and falls into the inside of the treatment tank 1 and contacts the sewage. The third motor 25 is started. The third motor 25 controls the rotating rod 26 to rotate. The rotating rod 26 drives the stirring blade 2 7 rotates, the stirring blade 27 rotates and stirs the sewage, so that the sewage and the coagulant are quickly mixed, the feed pipe 2 stops conveying sewage, and then the control component stops controlling the filter box 22 to make a reciprocating motion, and the first motor 10 is started. The first motor 10 controls the transmission shaft 21 to rotate, the transmission shaft 21 drives the base 31 to rotate, the base 31 drives the filter box 22 to rotate, the opening of the filter box 22 tilts toward the slag discharge port 12, the rotation of the filter box 22 drives the guide rod 17 to rotate, the guide rod 17 drives the sliding block 20 to rotate, the sliding block 20 slides in the slide rail 18, and then the filter box is continued to be controlled by the control component. 22 makes reciprocating motion, so that the large particles of ore slag filtered by the filter box 22 fall from the filter box 22 as they shake, and the large particles of ore slag on the filter box 22 fall into the slag discharge port 12 and are discharged through the slag discharge port 12. A valve is set on the discharge pipe 5. The valve at the discharge pipe 5 is opened to discharge the treated sewage. The coagulated impurities are intercepted by the filter screen 28. At the same time, the scraper 24 is driven to rotate by the rotating rod 26. The scraper 24 scrapes off the impurities on the surface of the filter screen 28 to prevent the impurities from clogging the filter screen 28. After the treated water is discharged, the valve at the slag discharge pipe 3 is opened to discharge the impurities through the slag discharge pipe 3.

[0023] The above is only a preferred embodiment of the present invention. Any person skilled in the art may modify the present invention by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. An iron ore beneficiation wastewater treatment device, comprising a treatment tank (1), characterized in that: The processing tank (1) is provided with a filtering control mechanism and a feeding mechanism inside; The filtering control mechanism comprises a second bottom plate (9), the second bottom plate (9) being fixedly arranged on one side of the processing tank (1), a first motor (10) being fixedly arranged on the top of the second bottom plate (9), a transmission shaft (21) being fixedly connected to the output end of the first motor (10), the transmission shaft (21) extending into the processing tank (1) and being connected to the inner wall of the processing tank (1) via a bearing, a base (31) being sleeved on the outside of the transmission shaft (21), a groove (40) being provided on one side of the transmission shaft (21), the transmission shaft (21) being slidably connected to the base (31), a filter box (22) being fixedly arranged on the top of the base (31), and a control component being provided on one side of the filter box (22).

2. The iron ore dressing wastewater treatment device according to claim 1 is characterized in that: The control component comprises a fixed frame (11), the fixed frame (11) being fixedly arranged on one side of the processing tank (1), a second motor (13) being fixedly arranged on one side of the fixed frame (11), a reciprocating screw (15) being fixedly connected to the output end of the second motor (13), one end of the reciprocating screw (15) being connected to the outer wall of the processing tank (1) via a bearing, a limit rod (14) being fixedly arranged between the fixed frame (11) and the processing tank (1), the limit rod (14) penetrating through a circular plate (16) and being slidably connected to the circular plate (16), a circular plate (16) being sleeved on the outside of the reciprocating screw (15), the reciprocating screw (15) being connected to the circular plate (16) via a ball screw pair, a slide rail (18) being provided on one side of the circular plate (16), a sliding block (20) being arranged inside the slide rail (18), a guide rod (17) being fixedly arranged on one side of the sliding block (20), one end of the guide rod (17) being fixedly connected to the filter box (22).

3. The iron ore dressing wastewater treatment device according to claim 2 is characterized in that: The side wall of the processing tank (1) is provided with an arc-shaped slide groove (19), and the guide rod (17) passes through the arc-shaped slide groove (19) and is slidably connected to the arc-shaped slide groove (19).

4. The iron ore dressing wastewater treatment device according to claim 1 is characterized in that: The feeding mechanism comprises a first bottom plate (7), the first bottom plate (7) being fixedly arranged on one side of the processing tank (1), a pump (8) being fixedly arranged on the top of the first bottom plate (7), an output end of the pump (8) being fixedly connected to a delivery pipe (29), the delivery pipe (29) extending into the interior of the processing tank (1), two branch pipes (30) being fixedly arranged on the bottom of the delivery pipe (29), a feeding shell (33) being fixedly arranged on the bottom of the two branch pipes (30), a discharge port (34) being provided on the bottom of the feeding shell (33), a connecting shell (35) being fixedly arranged on one side of the feeding shell (33), a rotating shaft (38) being connected to the interior of the feeding shell (33) via a bearing, the rotating shaft (38) extending into the connecting shell ( The rotating shaft (38) is provided with a feed impeller (39) fixedly sleeved outside the rotating shaft (38), and the feed impeller (39) is arranged inside the feeding shell (33). The rotating shaft (38) is provided with a gear (37) fixedly sleeved outside the rotating shaft (38), and a tooth plate (36) is provided on one side of the gear (37), and the tooth plate (36) is meshed with the gear (37). The tooth plate (36) penetrates the connecting shell (35) and is slidably connected to the connecting shell (35). A connecting plate (32) is fixedly provided on one side of the tooth plate (36), and the connecting plate (32) is sleeved on the outside of the transmission shaft (21) and is slidably connected to the transmission shaft (21), and the connecting plate (32) is connected to the base (31) through a bearing.

5. The iron ore dressing wastewater treatment device according to claim 4 is characterized in that: A connecting rod (23) is fixedly provided on one side of the feed shell (33) and the connecting shell (35), and the connecting rod (23) is fixedly connected to the inner wall of the processing tank (1).

6. The iron ore dressing wastewater treatment device according to claim 1, characterized in that: A third motor (25) is fixedly provided at the bottom of the processing tank (1); a rotating rod (26) is fixedly connected to the output end of the third motor (25); a plurality of stirring blades (27) are fixedly provided on the outer surface of the rotating rod (26); and two scrapers (24) are fixedly provided on the outer surface of the rotating rod (26).

7. The iron ore dressing wastewater treatment device according to claim 1 is characterized by: Two filter screens (28) are embedded in the bottom of the processing tank (1), two material discharge shells (4) are fixedly provided at the bottom of the processing tank (1), and material discharge pipes (5) are fixedly provided at the bottoms of the two material discharge shells (4).

8. The iron ore dressing wastewater treatment device according to claim 1, characterized in that: A slag discharge pipe (3) is fixedly provided at the bottom of the processing tank (1), and a plurality of support legs (6) are fixedly provided at the bottom of the processing tank (1).

9. The iron ore dressing wastewater treatment device according to claim 1, characterized in that: A feed pipe (2) is fixedly provided on the top of the processing tank (1).

10. The iron ore dressing wastewater treatment device according to claim 1, characterized in that: A slag discharge port (12) is fixedly provided on one side of the processing tank (1).

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