Recycling sewage treatment device

Abstract

The utility model provides a recycling sewage treatment device, and belongs to the technical field of sewage treatment.The sewage treatment device comprises a shell, two garbage boxes and a protective shell are fixedly connected to the shell, the sewage treatment device further comprises a filtering assembly, and the filtering assembly comprises a rotating column, a first rotating plate, a second rotating plate, a rotating rod, a through hole and a sliding box; according to the sewage filtering device, the filtering assembly is matched with the sliding box through the rotating column, the first rotating plate, the second rotating plate, the rotating rod, the through hole and the sliding box, when the second rotating plate is inclined to clean impurities on the second rotating plate, the first rotating plate is in a horizontal state to filter sewage, the sewage filtering process is not delayed, and therefore the working efficiency of the sewage filtering device is improved; and the driving assembly drives a first rotating plate and a second rotating plate to rotate through cooperation of a second motor, a first connecting column, a second connecting column and a chain, impurities on the second rotating plate can be cleaned, and the effect of convenient cleaning is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and in particular to a sewage treatment device for recycling and reuse. Background Art

[0002] In order to protect the environment and respond to the concept of sustainable development, some sewage treatment devices are now available on the market. They purify sewage and recycle it for reuse to save water resources.

[0003] A Chinese patent with publication number CN218434940U discloses a sewage treatment device for recycling and reuse, and relates to the field of sewage recycling technology. The patent uses a water-stop rubber strip at the bottom of the cover plate to seal the outer side of the liquid guide bucket to prevent sewage penetration and ensure the smooth progress of the static process. During the filtration process, the cover plate is removed to ensure that the internal material passes through the liquid guide bucket smoothly. There is no need to use a pump to guide it out, which is very convenient, and the liquid guide bucket has a large flux and will not be blocked.

[0004] In the above technical solution, the filter in the patent needs to be cleaned manually, which is rather troublesome, and during the cleaning process, the machine cannot filter, thus affecting the progress of sewage treatment. Utility Model Content

[0005] The purpose of the utility model is to provide a sewage treatment device for recycling and reuse, which can provide power to the filtering component through the driving component, filter the sewage through the filtering component, clean the impurities on the second rotating plate through the second motor, and filter using the first rotating plate, thereby speeding up its working efficiency.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides a sewage treatment device for recycling and reuse, comprising:

[0008] A housing, wherein two garbage boxes and a protective shell are fixedly connected to the housing; a reaction assembly and a filter assembly are arranged in the housing, wherein the reaction assembly comprises a water inlet pipe, a first motor, a feed pipe, a turntable, a partition, a water hole and a water outlet pipe, wherein the water inlet pipe is fixedly connected to the housing, the first motor is fixedly connected to the housing, the feed pipe is fixedly connected to the housing, the turntable is fixedly connected to the output shaft of the first motor, the partition is fixedly connected to the housing, the turntable is rotatably connected to the partition, a plurality of water holes are respectively provided on the turntable and the partition, and the water outlet pipe is fixedly connected to the housing;

[0009] The filter assembly comprises two first rotating columns, two second rotating columns, two first rotating plates and two second rotating plates, the two first rotating columns and the two second rotating columns are rotatably connected in the housing, the two first rotating plates are respectively fixedly connected to the two first rotating columns, and the two second rotating plates are respectively fixedly connected to the two second rotating columns;

[0010] A driving assembly for driving the first rotating column and the second rotating column to rotate is arranged in the protective shell.

[0011] In an optional embodiment, the filter assembly further includes a fixed block and a guide plate, the two fixed blocks are respectively fixedly connected to the two second rotating plates, the two guide plates are respectively rotatably connected to the two fixed blocks, and the two guide plates are fixedly connected in the outer shell.

[0012] In an optional embodiment, the filter assembly further comprises two sliding boxes, and the two sliding boxes are slidably installed in the two garbage boxes respectively; the housing is provided with two first through holes, and the garbage box is provided with two second through holes, the two first through holes and the two second through holes correspond to and are connected to each other, and the second through holes are connected to the sliding boxes;

[0013] The guide plate is used to guide impurities on the second rotating plate to the first through hole.

[0014] In an optional embodiment, an observation window is provided on the top of the trash box, and the observation window is used to observe the sliding box located in the trash box.

[0015] In an optional embodiment, handles are provided on both sides of the sliding box, and the sliding box can be selectively pulled out from one end of the garbage box.

[0016] In an optional embodiment, the top of the sliding box is configured to be open, the height of the opening is lower than the height of the second through hole, and the opening is used to receive impurities discharged from the second through hole.

[0017] In an optional embodiment, the driving assembly includes a second motor and a first gear, the second motor is fixedly connected in the protective shell, and the first gear is fixedly connected to the output shaft of the second motor.

[0018] In an optional embodiment, the driving assembly further includes a connecting rod and a second gear, wherein the connecting rod is rotatably connected in the protective shell, the second gear is fixedly connected to the connecting rod, and the first gear is meshed with the second gear.

[0019] In an optional embodiment, the drive assembly further includes a first connecting column, a second connecting column, a third connecting column, a fourth connecting column, a first transmission bar, a second transmission bar, a third transmission bar and a fourth transmission bar; the first connecting column and the second connecting column are respectively fixedly connected to the two first rotating columns, the third connecting column and the fourth connecting column are respectively fixedly connected to the two second rotating columns, the first connecting column, the second connecting column, the third connecting column and the fourth connecting column are located at the four corners of the same rectangle, and the first connecting column and the fourth connecting column are diagonally arranged, and the second connecting column and the third connecting column are diagonally arranged;

[0020] The first transmission bar is connected to the connecting rod and the first connecting column at the same time, the second transmission bar is connected to the connecting rod and the third connecting column at the same time, the third transmission bar is connected to the output shaft of the second motor and the second connecting column at the same time, and the fourth transmission bar is connected to the output shaft of the second motor and the fourth connecting column at the same time.

[0021] In an optional embodiment, the first transmission bar is configured as a belt or a chain.

[0022] The beneficial effects of the embodiments of the utility model are:

[0023] First: In the embodiment of the utility model, the filter assembly is matched by the first rotating column, the second rotating column, the first rotating plate, the second rotating plate, the guide plate, the through hole and the sliding box. When the second rotating plate is tilted to clean the impurities thereon, the first rotating plate is in a horizontal state to filter the sewage, which does not delay the sewage filtering process, thereby improving its working efficiency;

[0024] Second: In the embodiment of the utility model, the driving component is coordinated by the second motor, the first gear, the connecting rod, the second gear, the first connecting column, the second connecting column, the third connecting column, the fourth connecting column, the first transmission bar, the second transmission bar, the third transmission bar and the fourth transmission bar. The second motor drives the first gear to rotate and drives the second gear to rotate through the first gear. The first connecting column, the second connecting column, the third connecting column and the fourth connecting column start to rotate under the action of the corresponding transmission bar, so that the first rotating plate and the second rotating plate rotate accordingly. For example, when the two first rotating plates rotate to a horizontal closed state, the two second rotating plates rotate to a position inclined to the horizontal plane. The two first rotating plates can filter sewage and at the same time clean up impurities on the second rotating plates, thereby achieving a convenient cleaning effect.

[0025] After the impurities on the second rotating plate are cleaned, the second motor drives the first gear to rotate in the opposite direction, and the two first rotating plates rotate downward to open and the two second rotating plates rotate downward to close through the cooperation of the second gear, the first connecting column, the second connecting column, the third connecting column, the fourth connecting column, the first transmission bar, the second transmission bar, the third transmission bar and the fourth transmission bar, and the impurities on the two first rotating plates slide onto the second rotating plate, and the second rotating plate can filter the sewage, and the impurity cleaning and sewage filtering can be performed simultaneously. It should be understood that the first rotating plate and the second rotating plate on the same side have the same rotation direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a three-dimensional structural schematic diagram of the sewage treatment device for recycling and reuse of the utility model;

[0028] Figure 2 It is a schematic diagram of the internal three-dimensional structure of the sewage treatment device for recycling and reuse of the utility model;

[0029] Figure 3 It is a cross-sectional view of the internal structure of the sewage treatment device for recycling and reuse of the utility model;

[0030] Figure 4 It is a cross-sectional view of the internal structure of the driving component in the utility model.

[0031] icon:

[0032] 1-housing; 2-trash box; 3-reaction component; 31-water inlet pipe; 32-first motor; 33-feeding pipe; 34-turntable; 35-partition; 36-water hole; 37-water outlet pipe; 4-filter component; 41-first rotating column; 411-second rotating column; 42-first rotating plate; 43-second rotating plate; 44-fixed block; 45-guide plate; 46-first through hole; 461-second through hole; 47-sliding box; 471-handle; 5-driving component; 51-second motor; 52-first gear; 53-connecting rod; 54-second gear; 55-first connecting column; 551-second connecting column; 56-third connecting column; 561-fourth connecting column; 57-first transmission bar; 571-second transmission bar; 572-third transmission bar; 573-fourth transmission bar; 6-protective shell. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figure 1-Figure 4 As shown, this embodiment provides a sewage treatment device for recycling and reuse, including a shell 1, on which two garbage boxes 2 and a protective shell 6 are fixedly connected, and the two garbage boxes 2 are symmetrical with the shell 1 as an axis. A reaction component 3 and a filter component 4 are arranged in the shell 1, and the reaction component 3 includes a water inlet pipe 31, a first motor 32, a feed pipe 33, a turntable 34, a partition 35, a water hole 36 and a water outlet pipe 37. The water inlet pipe 31 is fixedly connected to the shell 1, the first motor 32 is fixed to the shell 1 by bolts, the feed pipe 33 is fixedly connected to the shell 1, the turntable 34 is fixed to the output shaft of the first motor 32 by bolts, the partition 35 is fixedly connected to the shell 1, the turntable 34 is rotatably connected to the partition 35, a plurality of water holes 36 are respectively opened on the turntable 34 and the partition 35, and the water outlet pipe 37 is fixedly connected to the shell 1. The filter assembly 4 includes two first rotating columns 41, two second rotating columns 411, two first rotating plates 42 and two second rotating plates 43. The two first rotating columns 41 and the two second rotating columns 411 are all rotatably connected to the housing 1. The two first rotating plates 42 are respectively fixedly connected to the two first rotating columns 41. The two first rotating plates 42 are arranged left and right. The first rotating plates 42 and the second rotating plates 43 are both composed of a smooth iron plate and a filter screen. The two second rotating plates 43 are respectively fixedly connected to the two second rotating columns 411. The two second rotating plates 43 are arranged left and right and are located below the first rotating plates 42. A driving assembly 5 is provided in the protective shell 6. The driving assembly 5 is used to drive the first rotating column 41 and the second rotating column 411 to rotate, thereby driving the first rotating plate 42 and the second rotating plate 43 to rotate synchronously.

[0040] In this embodiment, optionally, Figure 2 and Figure 3 As shown, the filter assembly 4 further includes a fixed block 44 and a guide plate 45, the two fixed blocks 44 are respectively fixedly connected to the two second rotating plates 43, and the two guide plates 45 are respectively rotatably connected to the two fixed blocks 44, that is, a shaft body can be set on the fixed block 44, and the side of the guide plate 45 can be rotatably matched with the shaft body to realize the rotatable connection between the fixed block 44 and the guide plate 45. The two guide plates 45 are arranged axially symmetrically with the output shaft of the first motor 32 as the symmetry line, and the two guide plates 45 are fixedly connected to the housing 1, and each guide plate 45 is inclined with the inner wall of the housing 1 to form a guide cavity with a larger upper part and a smaller lower part.

[0041] Further, such as Figure 2 and Figure 3As shown, the filter assembly 4 also includes two sliding boxes 47, and the two sliding boxes 47 are slidably installed in the two garbage boxes 2 respectively; two first through holes 46 are provided on the housing 1, and two second through holes 461 are provided on the garbage box 2, and the two first through holes 46 and the two second through holes 461 correspond to and are connected to each other, and the second through holes 461 are connected to the sliding boxes 47. Two guide plates 45 are respectively provided at the two first through holes 46, and are used to guide the impurities on the second rotating plate 43 to the first through holes 46. The two sliding boxes 47 are respectively slidably connected in the two garbage boxes 2, and each sliding box 47 is provided with a handle 471, which is convenient for pulling out and cleaning. In addition, handles 471 can be provided at both ends of the sliding box 47, and the sliding box 47 can be selectively pulled out from one end of the garbage box 2, which is easy to operate.

[0042] It should be noted that, in other embodiments, the top of the sliding box 47 is set to be open, the height of the opening is lower than the height of the second through hole 461, and the opening is used to receive impurities discharged from the second through hole 461.

[0043] In this embodiment, optionally, Figure 4 As shown, the driving assembly 5 includes a second motor 51, a first gear 52, a connecting rod 53, a second gear 54, a first connecting column 55, a second connecting column 551, a third connecting column 56, a fourth connecting column 561, a first transmission bar 57, a second transmission bar 571, a third transmission bar 572 and a fourth transmission bar 573. The second motor 51 is fixed in the protective shell 6 by bolts, the first gear 52 is fixed on the output shaft of the second motor 51 by bolts, and the first gear 52 is rotatably connected to the housing 1. The connecting rod 53 is rotatably connected in the protective shell 6, the second gear 54 is fixedly connected to the connecting rod 53, and the first gear 52 is meshed with the second gear 54. The first connecting column 55 and the second connecting column 551 are fixedly connected to the two first rotating columns 41 respectively, the third connecting column 56 and the fourth connecting column 561 are fixedly connected to the two second rotating columns 411 respectively, the first connecting column 55, the second connecting column 551, the third connecting column 56 and the fourth connecting column 561 are located at the four corners of the same rectangle, and the first connecting column 55 and the fourth connecting column 561 are arranged diagonally, and the second connecting column 551 and the third connecting column 56 are arranged diagonally; the first transmission bar 57 is simultaneously connected to the connecting rod 53 and the first connecting column 55, the second transmission bar 571 is simultaneously connected to the connecting rod 53 and the third connecting column 56, the third transmission bar 572 is simultaneously connected to the output shaft of the second motor 51 and the second connecting column 551, and the fourth transmission bar 573 is simultaneously connected to the output shaft of the second motor 51 and the fourth connecting column 561.

[0044] From the above description, we can see that Figure 3 Take the perspective shown as an example for explanation. Figure 3In the embodiment, the two first rotating plates 42 are in an open state, and the two second rotating plates 43 are in a closed state. At this time, the sewage falls on the second rotating plates 43 to be filtered, and the impurities are located on the second rotating plates 43. Figure 3 and Figure 4 When it is necessary to clean the impurities on the second rotating plate 43, the second motor 51 is started, the first gear 52 rotates counterclockwise, the first rotating plate 42 and the second rotating plate 43 on the left side both rotate counterclockwise, the first rotating plate 42 rotates upward to close, and the second rotating plate 43 rotates upward to open. Similarly, the first gear 52 drives the second gear 54 to rotate clockwise, the first rotating plate 42 and the second rotating plate 43 on the right side rotate clockwise, the first rotating plate 42 rotates upward to close, and the second rotating plate 43 rotates upward to open. In this way, the two first rotating plates 42 cooperate to be in a closed state and can filter sewage. The two second rotating plates 43 cooperate to be in an open state, and both can guide impurities from the guide plate 45 into the sliding box 47.

[0045] It should be understood that the first transmission bar 57, the second transmission bar 571, the third transmission bar 572 and the fourth transmission bar 573 are configured as belts or chains, etc.

[0046] The following is an operation method of the sewage treatment device of this embodiment:

[0047] In the initial state, the water holes 36 on the rotating disk 34 are misaligned with the water holes 36 on the partition 35, and sewage is injected through the water inlet pipe 31, and coagulant is added through the feed pipe 33, so that the sewage fully reacts with the coagulant in the space formed by the shell 1 and the partition 35. After the mixing is completed, the first motor 32 is started, and the rotating disk 34 rotates accordingly, so that the water holes 36 thereon overlap with the water holes 36 on the partition 35 periodically, and the mixed sewage flows down from the water holes 36, passes through the filtration of the first rotating plate 42 and the second rotating plate 43, reaches the bottom of the shell 1, and can be discharged through the outlet pipe 37. When the second rotating plate needs to be cleaned When impurities on the two first rotating plates 43 are removed, the second motor 51 is started, and its output shaft drives the first gear 52 to rotate, and the second gear 54 rotates accordingly. Through the cooperation of multiple connecting columns and multiple transmission strips, when the two first rotating plates 42 are in a horizontal direction, the two second rotating plates 43 are tilted, so that the impurities thereon flow along the second rotating plates 43 and the guide plates 45 to reach the sliding box 47, thereby realizing the cleaning of the second rotating plates 43. After the cleaning is completed, the second motor 51 is started to reverse, so that the first rotating plates 42 and the second rotating plates 43 are reset, and the impurities on the first rotating plate 42 will fall onto the second rotating plate 43, waiting for the next cleaning.

[0048] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sewage treatment device for recycling and reuse, characterized in that: include: A housing (1), wherein two garbage boxes (2) and a protective shell (6) are fixedly connected to the housing (1); a reaction assembly (3) and a filter assembly (4) are arranged in the housing (1); the reaction assembly (3) comprises a water inlet pipe (31), a first motor (32), a feed pipe (33), a rotating disk (34), a partition (35), a water hole (36) and a water outlet pipe (37); the water inlet pipe (31) is fixedly connected to the housing (1); the first motor ( The first motor (32) is fixedly connected to the housing (1), the feed pipe (33) is fixedly connected to the housing (1), the turntable (34) is fixedly connected to the output shaft of the first motor (32), the partition (35) is fixedly connected to the housing (1), the turntable (34) is rotatably connected to the partition (35), a plurality of water holes (36) are respectively provided on the turntable (34) and the partition (35), and the water outlet pipe (37) is fixedly connected to the housing (1); The filter assembly (4) comprises two first rotating columns (41), two second rotating columns (411), two first rotating plates (42) and two second rotating plates (43); the two first rotating columns (41) and the two second rotating columns (411) are both rotatably connected to the housing (1); the two first rotating plates (42) are respectively fixedly connected to the two first rotating columns (41); and the two second rotating plates (43) are respectively fixedly connected to the two second rotating columns (411); A driving assembly (5) for driving the first rotating column (41) and the second rotating column (411) to rotate is arranged in the protective shell (6).

2. The sewage treatment device for recycling and reuse according to claim 1 is characterized in that: The filter assembly (4) further comprises a fixed block (44) and a guide plate (45), wherein the two fixed blocks (44) are respectively fixedly connected to the two second rotating plates (43), the two guide plates (45) are respectively rotatably connected to the two fixed blocks (44), and the two guide plates (45) are fixedly connected inside the housing (1).

3. The sewage treatment device for recycling and reuse according to claim 2 is characterized in that: The filter assembly (4) further comprises two sliding boxes (47), the two sliding boxes (47) being slidably mounted in the two garbage boxes (2) respectively; the housing (1) is provided with two first through holes (46), the garbage box (2) is provided with two second through holes (461), the two first through holes (46) and the two second through holes (461) respectively correspond to and are in communication with each other, and the second through holes (461) are in communication with the sliding boxes (47); The guide plate (45) is used to guide impurities on the second rotating plate (43) to the first through hole (46).

4. The sewage treatment device for recycling and reuse according to claim 3 is characterized in that: The top of the garbage box (2) is provided with an observation window, and the observation window is used to observe the sliding box (47) located in the garbage box (2).

5. The sewage treatment device for recycling and reuse according to claim 3 is characterized in that: Handles (471) are provided on both sides of the sliding box (47), and the sliding box (47) can be selectively pulled out from one end of the garbage box (2).

6. The sewage treatment device for recycling and reuse according to claim 3 is characterized by: The top of the sliding box (47) is arranged to be open, the height of the opening being lower than the height of the second through hole (461), and the opening is used to receive impurities discharged from the second through hole (461).

7. The sewage treatment device for recycling and reuse according to claim 1 is characterized in that: The driving assembly (5) comprises a second motor (51) and a first gear (52); the second motor (51) is fixedly connected to the protective shell (6); and the first gear (52) is fixedly connected to the output shaft of the second motor (51).

8. The sewage treatment device for recycling and reuse according to claim 7 is characterized in that: The driving assembly (5) further comprises a connecting rod (53) and a second gear (54); the connecting rod (53) is rotatably connected to the protective shell (6); the second gear (54) is fixedly connected to the connecting rod (53); and the first gear (52) is meshed with the second gear (54).

9. The sewage treatment device for recycling and reuse according to claim 8, characterized in that: The driving assembly (5) further comprises a first connecting column (55), a second connecting column (551), a third connecting column (56), a fourth connecting column (561), a first transmission bar (57), a second transmission bar (571), a third transmission bar (572) and a fourth transmission bar (573); the first connecting column (55) and the second connecting column (551) are respectively fixedly connected to the two first rotating columns (41), the third connecting column (56) and the fourth connecting column (561) are respectively fixedly connected to the two second rotating columns (411), the first connecting column (55), the second connecting column (551), the third connecting column (56) and the fourth connecting column (561) are located at the four corners of the same rectangle, and the first connecting column (55) and the fourth connecting column (561) are diagonally arranged, and the second connecting column (551) and the third connecting column (56) are diagonally arranged; The first transmission bar (57) is connected to the connecting rod (53) and the first connecting column (55) at the same time, the second transmission bar (571) is connected to the connecting rod (53) and the third connecting column (56) at the same time, the third transmission bar (572) is connected to the output shaft of the second motor (51) and the second connecting column (551) at the same time, and the fourth transmission bar (573) is connected to the output shaft of the second motor (51) and the fourth connecting column (561) at the same time.

10. The sewage treatment device for recycling and reuse according to claim 9, characterized in that: The first transmission bar is configured as a belt or a chain.

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