Steel dam gate

Abstract

The utility model discloses a steel dam gate, including gate leaf, bottom axle, support device, open and close device and speed reducer, gate leaf bottom is fixedly connected with bottom axle, and support device includes a plurality of support hinge seat, and bottom axle is placed on the semicircular top support surface of support hinge seat, and open and close device includes swing hydraulic cylinder, and both ends of bottom axle are connected with swing hydraulic cylinder, and swing hydraulic cylinder is fixed on the bank outside the lock wall, and swing hydraulic cylinder is connected with bottom axle through speed reducer, and speed reducer is fixed on the bank outside the lock wall, and swing hydraulic cylinder drives bottom axle to rotate to drive gate leaf to overturn, and the rotation angle of bottom axle is 0~90 DEG, and bottom axle drives gate leaf to overturn in the range from vertical to horizontal or from horizontal to vertical. The utility model discloses through speed reducer realizes the amplification of torque, and swing hydraulic cylinder of smaller torque can satisfy the demand, and reduces the cost, and swing hydraulic cylinder and speed reducer are fixed on the bank outside the lock wall, and the construction difficulty is reduced, and the construction period is shortened.

Description

Technical Field

[0001] This utility model belongs to the technical field of water conservancy engineering equipment, and more specifically, this utility model relates to a steel dam gate. Background Technology

[0002] Gates are control devices used to close and open water discharge channels. They are installed on the openings of structures such as spillways, bank spillways, discharge holes, hydraulic tunnels, and sluice gates to regulate flow, control water levels, discharge floodwaters, and remove silt or floating debris. They are an important component of hydraulic structures.

[0003] The academic name for the steel dam is a bottom-shaft driven flap gate, meaning the gate leaf is installed and fixed on a bottom shaft, which is connected to the opening and closing equipment. The opening and closing equipment drives the bottom shaft to rotate within a range of 0 to 90 degrees, causing the gate leaf to flip and block water. However, the current opening and closing equipment has a large torque, resulting in high cost; moreover, some opening and closing equipment is located upstream of the gate leaf, making construction difficult and time-consuming. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model innovatively provides a steel dam gate that amplifies torque through a speed reducer, allowing the use of a swing hydraulic cylinder with a smaller torque to meet the requirements and reduce costs. The swing hydraulic cylinder and speed reducer are fixed on the bank outside the gate wall, reducing construction difficulty and shortening the construction period.

[0005] To achieve the aforementioned technical objectives, this utility model discloses a steel dam gate, comprising a gate leaf, a bottom shaft, a support device, an opening and closing device, and a speed reducer.

[0006] The bottom of the door leaf is fixedly connected to the bottom shaft.

[0007] The support device is supported below the bottom shaft. The support device includes multiple hinge seats arranged along the length of the bottom shaft. The top support surface of each hinge seat is semi-circular. The bottom shaft rests on the top support surface of the hinge seat.

[0008] The opening and closing device includes a swing hydraulic cylinder. Both ends of the bottom shaft are connected to the swing hydraulic cylinder. The swing hydraulic cylinder is fixed on the bank outside the gate wall. The bottom shaft passes through the gate wall and is connected to the swing hydraulic cylinder. The swing hydraulic cylinder is connected to the bottom shaft through the reducer. The reducer is fixed on the bank outside the gate wall. The swing hydraulic cylinder drives the bottom shaft to rotate around the axis of the bottom shaft in the top support surface of the hinge seat to drive the gate leaf to flip. The rotation angle of the bottom shaft is 0~90°. The bottom shaft drives the gate leaf to flip from vertical to horizontal or from horizontal to vertical.

[0009] Furthermore, a through-wall sleeve is provided between the bottom shaft and the gate wall. The through-wall sleeve is sleeved on the bottom shaft. A sealing structure is provided between the through-wall sleeve and the bottom shaft. The sealing structure includes at least one of a sealing packing, a first sealing ring, and a second sealing ring. The first sealing ring has a circular cross-section, and the second sealing ring has a rectangular cross-section. The sealing structure is sleeved on the bottom shaft.

[0010] Furthermore, a groove is provided on the inner wall of the through-wall sleeve, and the sealing structure is engaged in the groove. The surface of the sealing structure near the central axis of the through-wall sleeve protrudes from the groove opening.

[0011] Furthermore, the through-wall sleeve has flanges at both ends.

[0012] Furthermore, the reducer includes a large gear and a small gear that mesh with each other. The large gear has more teeth than the small gear. The large gear is fixed to the end of the bottom shaft and is coaxially connected to the bottom shaft. The small gear is fixed to the end of the output shaft of the swing hydraulic cylinder and is coaxially connected to the output shaft of the swing hydraulic cylinder. The small gear is an external gear, and the large gear is an internal gear or an external gear.

[0013] Furthermore, the reducer also includes a housing, which is fitted over the large gear and the small gear.

[0014] Furthermore, the large gear is rotatably connected to the housing via a first bearing, and the small gear is rotatably connected to the housing via a second bearing.

[0015] Furthermore, the bottom shaft is connected to the large gear key, and the output shaft of the swing hydraulic cylinder is connected to the small gear key.

[0016] Furthermore, the door leaf is a flat plate or an arc-shaped plate protruding towards the incoming water side.

[0017] Furthermore, a self-lubricating bushing is fitted onto the bottom shaft, and the self-lubricating bushing is located between the bottom shaft and the top support surface of the hinge seat.

[0018] The beneficial effects of this utility model are as follows:

[0019] The steel dam gate of this utility model amplifies the torque through a speed reducer, and the swing hydraulic cylinder with a smaller torque can meet the requirements, thus reducing costs. The swing hydraulic cylinder is fixed on the bank outside the gate wall, which reduces the construction difficulty and shortens the construction period. Attached Figure Description

[0020] Figure 1 This is a front view of the steel dam gate according to an embodiment of this utility model.

[0021] Figure 2 This is a three-dimensional schematic diagram of the steel dam gate according to an embodiment of the present utility model.

[0022] Figure 3 This is a schematic diagram of the speed reducer according to an embodiment of the present invention.

[0023] Figure 4 This is a structural schematic diagram of a speed reducer according to another embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the through-wall sleeve according to an embodiment of the present utility model.

[0025] Figure 6 This is a longitudinal sectional view of the through-wall sleeve according to an embodiment of the present utility model.

[0026] Figure 7 This is a side view of a hinge support according to another embodiment of the present invention.

[0027] In the picture,

[0028] 1. Door leaf; 2. Bottom shaft; 21. Self-lubricating bushing; 3. Support device; 31. Hinge seat; 311. First support plate; 312. First support base plate; 313. Connecting plate; 314. First reinforcing rib plate; 315. Bearing plate; 316. Second support plate; 317. Second support base plate; 318. Second reinforcing rib plate; 4. Opening and closing device; 41. Swing hydraulic cylinder; 5. Reducer; 51. Large gear; 52. Small gear; 53. Housing; 6. Gate wall; 7. Waterway bottom plate; 8. Through-wall sleeve; 81. Flange; 9. Sealing structure; 91. Sealing packing; 92. First sealing ring; 93. Second sealing ring. Specific Implementation

[0030] The steel dam gate provided by this utility model will be explained and described in detail below with reference to the accompanying drawings.

[0031] This embodiment specifically discloses a steel dam gate, such as... Figure 1 and 2 As shown, the device includes a door leaf 1, a bottom shaft 2, a support device 3, an opening and closing device 4, and a reducer 5. The bottom of the door leaf 1 is fixedly connected to the bottom shaft 2. The support device 3 is supported below the bottom shaft 2. The support device 3 includes multiple hinge seats 31 arranged along the length of the bottom shaft 2. The top support surface of the hinge seat 31 is semi-circular. The bottom shaft 2 is placed on the top support surface of the hinge seat 31. The number of hinge seats 31 is set according to actual needs. Adjacent hinge seats 31 maintain a certain distance while ensuring stable support for the door leaf 1 and the bottom shaft 2.

[0032] The opening and closing device 4 includes a swing hydraulic cylinder 41. Both ends of the bottom shaft 2 are connected to the swing hydraulic cylinder 41, which is fixed to the bank outside the gate wall 6. The bottom shaft 2 passes through the gate wall 6 and connects to the swing hydraulic cylinder 41. The swing hydraulic cylinder 41 is connected to the bottom shaft 2 via a reducer 5, which is also fixed to the bank outside the gate wall 6. The swing hydraulic cylinder 41 drives the bottom shaft 2 to rotate around its axis within the top support surface of the hinge seat 31, thereby causing the gate leaf 1 to flip. The rotation angle of the bottom shaft 2 is 0~90°. The bottom shaft 2 causes the gate leaf 1 to flip from vertical to horizontal or from horizontal to vertical. That is, the maximum rotation angle of the bottom shaft 2 is 90°. The bottom shaft 2 can rotate clockwise and counterclockwise. When the bottom shaft 2 rotates 90°, the gate leaf 1 can flip from a vertical state to a horizontal state, or from a horizontal state to a vertical state. In this embodiment, the initial state of the gate leaf 1 is vertical. When the rotation angle of the bottom shaft 2 is 0°, the gate leaf 1 is in an upright state, which can block the flow of water upstream and downstream. When the rotation angle is greater than 0° and less than 90°, the rotation angle of the bottom shaft 2 is adjusted to regulate the water level. When the rotation angle is 90°, the gate leaf 1 lies down (in a horizontal state) in the water flow to achieve flow passage and navigation. When the bottom shaft 2 rotates in the opposite direction, the gate leaf 1 is flipped in the opposite direction.

[0033] In this embodiment, the inner side of the gate wall 6 refers to the side where the waterway is located, and the outer side refers to the side of the gate wall 6 away from the waterway.

[0034] Compared to placing the opening and closing device upstream of the gate leaf 1, this application fixes the swing hydraulic cylinder 41 on the shore, greatly reducing construction difficulty and shortening the construction period. Furthermore, the swing hydraulic cylinder 41 does not need to contact the water flow, thus avoiding damage caused by water erosion.

[0035] The reducer 5 is fixed on the bank outside the gate wall 6, which facilitates construction and can reduce the speed and increase the torque. The reducer 5 amplifies the torque and realizes the conversion from small torque to large torque. Therefore, compared with not setting the reducer 5, this application can choose a swing hydraulic cylinder 41 with smaller torque. The output shaft of the swing hydraulic cylinder 41 can be thinner, which reduces the cost.

[0036] The speed reducer 5 can be a gear reducer, worm gear reducer, or planetary gear reducer, as long as it can reduce the speed and increase the torque.

[0037] In this embodiment, the reducer 5 includes a large gear 51 and a small gear 52 that mesh with each other. The diameter of the large gear 51 is larger than the diameter of the small gear 52, and the number of teeth of the large gear 51 is greater than the number of teeth of the small gear 52. The ratio of the number of teeth of the large gear 51 to the small gear 52 is set as needed. The large gear 51 is fixed to the end of the base shaft 2 and is coaxially connected to the base shaft 2. The small gear 52 is fixed to the end of the output shaft of the swing hydraulic cylinder 41 and is coaxially connected to the output shaft of the swing hydraulic cylinder 41. The small gear 52 is an external gear, and the large gear 51 is an internal gear (e.g., ...). Figure 3 (as shown) or external gear (such as) Figure 4 (As shown).

[0038] like Figure 3 As shown, when the large gear 51 is an internal gear, the small gear 52 is located inside the large gear 51.

[0039] like Figure 4 As shown, when the large gear 51 is an external gear, the small gear 52 is located outside the large gear 51.

[0040] The output shaft of the swing hydraulic cylinder 41 rotates, which drives the small gear 52 to rotate, which in turn drives the large gear 51 to rotate, and the large gear 51 rotates to drive the bottom shaft 2 to rotate.

[0041] The meshing of the large gear 51 and the small gear 52 amplifies the torque, thus increasing the torque of the bottom shaft 2.

[0042] In some alternative embodiments, such as Figure 1 As shown, the reducer 5 also includes a housing 53, which is fitted over the large gear 51 and the small gear 52. The large gear 51 and the small gear 52 do not need to contact the housing 53. The bottom of the housing 53 is fixed to the bank outside the gate wall 6. The housing 53 protects the large gear 51 and the small gear 52, providing waterproofing and dustproofing, and extending the service life of the reducer 5. The housing 53 has holes for the bottom shaft 2 and the output shaft of the swing hydraulic cylinder 41 to pass through. The end of the bottom shaft 2 passes through the hole in the housing 53 and enters the housing 53 to be fixedly connected to the large gear 51. The end of the output shaft of the swing hydraulic cylinder 41 passes through the hole in the housing 53 and enters the housing 53 to be fixedly connected to the small gear 52.

[0043] To improve support capacity, the bottom shaft 2 and the housing 53 can be connected via bearings. The bearings are fitted onto the bottom shaft 2 and located within a hole in the housing 53. The inner ring of the bearing is fixedly connected to the bottom shaft 2, and the outer ring is fixedly connected to the wall of the hole in the housing 53. This fixed connection can be welded. Similarly, the output shaft of the swing hydraulic cylinder 41 can be connected to the housing 53 via bearings. The bearings are fitted onto the output shaft of the swing hydraulic cylinder 41 and located within a hole in the housing 53. The inner ring of the bearing is fixedly connected to the output shaft of the swing hydraulic cylinder 41, and the outer ring is fixedly connected to the wall of the hole in the housing 53. This fixed connection can be welded.

[0044] In some optional embodiments, the large gear 51 is rotatably connected to the housing 53 via a first bearing. The first bearing is located on the side of the large gear 51 away from the bottom shaft 2 and is coaxial with the large gear 51. One of the inner or outer rings of the first bearing is fixedly connected to the large gear 51, and the other is fixedly connected to the housing 53. The small gear 52 is rotatably connected to the housing 53 via a second bearing. The second bearing is located on the side of the small gear 52 away from the swing hydraulic cylinder 41 and is coaxial with the small gear 52. One of the inner or outer rings of the second bearing is fixedly connected to the small gear 52, and the other is fixedly connected to the housing 53. The fixed connection can be welded. The large gear 51 and the small gear 52 are rotatably connected to the housing 53 via bearings, improving the overall stability of the steel dam gate.

[0045] In some optional embodiments, the bottom shaft 2 is keyed to the large gear 51, and the output shaft of the swing hydraulic cylinder 41 is keyed to the small gear 52. The large gear 51 has a hole on its end face near the bottom shaft 2 for the bottom shaft 2 to be inserted into. The end of the bottom shaft 2 is inserted into the hole on the large gear 51 and keyed to the large gear 51 via a flat key or spline. The small gear 52 has a hole on its end face near the swing hydraulic cylinder 41 for the output shaft of the swing hydraulic cylinder 41 to pass through. The end of the output shaft of the swing hydraulic cylinder 41 is inserted into the hole on the small gear 52 and keyed to the small gear 52 via a flat key or spline, thus achieving a stable connection between the bottom shaft 2, the swing hydraulic cylinder 41, and the reducer 5.

[0046] In some alternative embodiments, such as Figure 1 and 2 As shown, a through-wall sleeve 8 is provided between the bottom shaft 2 and the gate wall 6. The through-wall sleeve 8 is fitted onto the bottom shaft 2, as shown. Figure 5 and 6As shown, a sealing structure 9 is provided between the through-wall sleeve 8 and the bottom shaft 2. The sealing structure 9 includes at least one of a sealing packing 91, a first sealing ring 92, and a second sealing ring 93. The first sealing ring 92 has a circular cross-section, and the second sealing ring 93 has a rectangular cross-section. The sealing structure 9 is sleeved on the bottom shaft 2. The number of sealing packings 91, the number of first sealing rings 92, and the number of second sealing rings 93 can be one or more. Preferably, the sealing structure 9 includes sealing packings 91, first sealing rings 92, and second sealing rings 93. That is, one or more sealing packings 91, one or more first sealing rings 92, and one or more second sealing rings 93 are provided inside the through-wall sleeve 8. The above-mentioned multiple sealing structures 9 are arranged along the length direction of the bottom shaft 2, and the sealing structures 9 can maintain a distance between each other to ensure the sealing effect and prevent water from flowing onto the shore from the gap between the bottom shaft 2 and the through-wall sleeve 8.

[0047] Furthermore, a groove is provided on the inner wall of the through-wall sleeve 8, and the sealing structure 9 is engaged in the groove. The surface of the sealing structure 9 near the central axis of the through-wall sleeve 8 protrudes from the groove opening, which improves the fixing stability of the sealing structure 9 and thus ensures the sealing effect.

[0048] Furthermore, such as Figure 5 and 6 As shown, the through-wall sleeve 8 has flanges 81 at both ends. The diameter of the flanges 81 is larger than the diameter of the hole in the sleeve body of the gate wall 6 that accommodates the through-wall sleeve 8. The flanges 81 at both ends of the through-wall sleeve 8 are distributed on both sides of the gate wall 6. The flanges 81 are tightly fitted with the gate wall 6 to prevent water from flowing through the gap between the through-wall sleeve 8 and the gate wall 6 and flowing onto the shore.

[0049] Optionally, a sealing gasket may be provided between the flange 81 and the gate wall 6. The sealing gasket may be a rubber gasket to enhance the sealing effect.

[0050] Optionally, the door leaf 1 is a flat plate or an arc-shaped plate protruding towards the incoming water side.

[0051] In some alternative embodiments, such as Figure 1 and 2 As shown, a self-lubricating bushing 21 is fitted on the bottom shaft 2. The self-lubricating bushing 21 is located between the bottom shaft 2 and the top support surface of the hinge seat 31, reducing the resistance to the rotation of the bottom shaft 2.

[0052] like Figure 2As shown, the hinge base 31 includes two first support plates 311 with a distance between them, a first support base plate 312 at the bottom of the first support plates 311, and a connecting plate 313 between the two first support plates 311. The first support plates 311 are vertically arranged and perpendicular to the bottom shaft 2. The top surface of the first support plates 311 is provided with a semi-circular groove. The bottom surface of the semi-circular groove serves as the top support surface of the hinge base 31. The top surface of the connecting plate 313 does not exceed the lowest point of the semi-circular groove. The connecting plate 313 is perpendicular to the first support base plate 312 and the first support plates 311. The first support base plate 312 is fixedly connected to the waterway bottom plate 7 by bolts. A first reinforcing rib plate 314 may also be provided between the two first support plates 311. The first reinforcing rib plate 314 is perpendicular to the first support base plate 312 and fixedly connected to the first support base plate 312. The first reinforcing rib plate 314 is parallel to the connecting plate 313, and the top surface of the first reinforcing rib plate 314 does not exceed the top surface of the connecting plate 313. The first reinforcing rib plates 314 are symmetrically distributed upstream and downstream of the connecting plate 313. The fixed connection can be welding.

[0053] In another embodiment, such as Figure 7 As shown, the hinge support 31 includes a semi-circular bearing plate 315, a second support plate 316 at the bottom of the bearing plate 315, and a second support base plate 317 at the bottom of the second support plate 316. The second support plate 316 is perpendicular to the bottom shaft 2 and is located at the center of the bearing plate 315. The top of the second support plate 316 is semi-circular and fixedly connected to the bearing plate 315. The bottom of the second support plate 316 is fixedly connected to the second support base plate 317, and the second support plate 316 is perpendicular to the second support base plate 317. The second support base plate 317 is connected to the waterway bottom plate 7 by bolts. Two parallel second reinforcing ribs 318 can be provided on each of the left and right sides of the second support plate 316. The second reinforcing ribs 318 on the left and right sides are symmetrically arranged. The two second reinforcing ribs 318 on the same side are symmetrically distributed upstream and downstream of the lowest point of the bearing plate 315. The second reinforcing ribs 318 are perpendicular to the second support plate 316 and the second support base plate 317. The top of the second reinforcing rib 318 is fixedly connected to the bearing plate 315, the bottom of the second reinforcing rib 318 is fixedly connected to the second support base plate 317, and the side of the second reinforcing rib 318 is fixedly connected to the second support plate 316. The fixed connection can be welded.

[0054] The hinge support 31 of this application has a stable structure and strong support capacity.

[0055] This application controls the rotation angle of the bottom shaft by controlling the rotation angle and number of rotations of the output shaft of the swing hydraulic cylinder, thereby controlling the tilting angle of the gate leaf, so as to realize functions such as blocking water flow, controlling water level or allowing flow and navigation.

[0056] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] In the description of this specification, the references to terms such as "this embodiment," "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any at least one embodiment or example. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and simple improvements made on the substantive content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steel dam gate, characterized in that, It includes door leaf (1), bottom shaft (2), support device (3), opening and closing device (4) and reducer (5). The bottom of the door leaf (1) is fixedly connected to the bottom shaft (2). The support device (3) is supported below the bottom shaft (2). The support device (3) includes a plurality of hinge seats (31) arranged along the length direction of the bottom shaft (2). The top support surface of the hinge seat (31) is semi-circular. The bottom shaft (2) is placed on the top support surface of the hinge seat (31). The opening and closing device (4) includes a swing hydraulic cylinder (41). Both ends of the bottom shaft (2) are connected to the swing hydraulic cylinder (41). The swing hydraulic cylinder (41) is fixed on the bank outside the gate wall (6). The bottom shaft (2) passes through the gate wall (6) and is connected to the swing hydraulic cylinder (41). The swing hydraulic cylinder (41) is connected to the bottom shaft (2) through the reducer (5). The reducer (5) is fixed on the bank outside the gate wall (6). The swing hydraulic cylinder (41) drives the bottom shaft (2) to rotate around the axis of the bottom shaft (2) in the top support surface of the hinge seat (31) to drive the gate leaf (1) to flip. The rotation angle of the bottom shaft (2) is 0~90°. The bottom shaft (2) drives the gate leaf (1) to flip from vertical to horizontal or from horizontal to vertical.

2. The steel dam gate according to claim 1, characterized in that, A through-wall sleeve (8) is provided between the bottom shaft (2) and the gate wall (6). The through-wall sleeve (8) is sleeved on the bottom shaft (2). A sealing structure (9) is provided between the through-wall sleeve (8) and the bottom shaft (2). The sealing structure (9) includes at least one of a sealing packing (91), a first sealing ring (92), and a second sealing ring (93). The first sealing ring (92) has a circular cross-section, and the second sealing ring (93) has a rectangular cross-section. The sealing structure (9) is sleeved on the bottom shaft (2).

3. The steel dam gate according to claim 2, characterized in that, The inner wall of the through-wall sleeve (8) is provided with a slot, and the sealing structure (9) is engaged in the slot. The surface of the sealing structure (9) near the central axis of the through-wall sleeve (8) protrudes from the slot opening.

4. The steel dam gate according to claim 2 or 3, characterized in that, The through-wall sleeve (8) has flanges (81) at both ends.

5. The steel dam gate according to claim 1, characterized in that, The reducer (5) includes a large gear (51) and a small gear (52) meshing with each other. The large gear (51) has more teeth than the small gear (52). The large gear (51) is fixed to the end of the bottom shaft (2) and is coaxially connected to the bottom shaft (2). The small gear (52) is fixed to the end of the output shaft of the swing hydraulic cylinder (41) and is coaxially connected to the output shaft of the swing hydraulic cylinder (41). The small gear (52) is an external gear, and the large gear (51) is an internal gear or an external gear.

6. The steel dam gate according to claim 5, characterized in that, The reducer (5) also includes a housing (53), which is fitted over the outside of the large gear (51) and the small gear (52).

7. The steel dam gate according to claim 6, characterized in that, The large gear (51) is rotatably connected to the housing (53) via a first bearing, and the small gear (52) is rotatably connected to the housing (53) via a second bearing.

8. The steel dam gate according to claim 5, characterized in that, The bottom shaft (2) is keyed to the large gear (51), and the output shaft of the swing hydraulic cylinder (41) is keyed to the small gear (52).

9. The steel dam gate according to claim 1, characterized in that, The door leaf (1) is a flat plate or an arc-shaped plate protruding towards the water flow side.

10. The steel dam gate according to claim 1, characterized in that, A self-lubricating bushing (21) is fitted on the bottom shaft (2), and the self-lubricating bushing (21) is located between the bottom shaft (2) and the top support surface of the hinge seat (31).

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