CN211395599U - Novel magnetic force turns over board dam - Google Patents
Novel magnetic force turns over board dam Download PDFInfo
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- CN211395599U CN211395599U CN201922048327.7U CN201922048327U CN211395599U CN 211395599 U CN211395599 U CN 211395599U CN 201922048327 U CN201922048327 U CN 201922048327U CN 211395599 U CN211395599 U CN 211395599U
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Abstract
The utility model provides a novel magnetic force flap dam, which comprises a dam body and a concrete baffle fixed on the ground of a river channel, wherein a dam body rotating shaft is arranged in the middle of the dam body along a horizontal line, the dam body rotating shaft is rotationally connected with the dam body by the water surface, and two ends of the dam body rotating shaft are respectively and correspondingly fixed on two banks of the river channel; the bottom of the dam body is pressed against the water facing side of the second face of the concrete baffle body by incoming water; the bottom of the water-receiving surface of the dam body is provided with an electromagnet, and an iron plate or other magnetic materials facing the electromagnet are embedded in the water-facing surface of the concrete baffle body; novel magnetic force turns over board dam still includes electromagnet control module, and electromagnet control module's signal output part connects the power input end of electro-magnet.
Description
Technical Field
The utility model relates to a turn over board dam control technical field, especially relate to a novel magnetic force turns over board dam.
Background
The flap dam on the market at present mainly adopts a hydraulic self-balancing mode, and has the advantages of being completely automatically controlled by hydraulic power and needing no energy. But has a disadvantage in that adjustment after setting the water level is difficult.
As shown in fig. 1, the conventional flap dam comprises a dam body 1 and a concrete baffle 4 fixed on the river ground, wherein the concrete baffle is arranged according to the needs of the site, for example, a laid triangular column, and the axis of the triangular column is horizontal or parallel to the river ground; the first surface of the axial outer wall of the triangular column body is arranged on the ground of a river channel, the second surface of the axial outer wall of the triangular column body is a water-facing surface, the third surface of the axial outer wall of the triangular column body is a water-receiving surface, the bottom of the dam body is arranged on the water-facing side of the concrete baffle body, the dam body is pressed by incoming water to the water-facing surface of the concrete baffle body, and the bottom of the dam body leans against the water-facing surface of the concrete baffle body; the middle part of the dam body is provided with a dam body rotating shaft along the horizontal line, the dam body rotating shaft is rotationally connected with the dam body, and two ends of the dam body rotating shaft are respectively fixed on two banks of the river channel;
usually, the dam body rotating shaft is related to the dam body opening water level height set according to the position height of a river channel, and the higher the rotating shaft is, the higher the water level of the dam which is finally automatically opened is. When the rotating shaft is X, the dam body is automatically opened when the water surface is higher than 3.414X; when the water level is lower than the overturning shaft of the dam body, the water pressure only presses the dam body to close the dam body. When the water level is higher than the dam rotating shaft, and the water level of the upstream surface of the dam is gradually increased, the opening force (clockwise torque (opening torque)) generated by water on the upper part of the dam is gradually increased and finally exceeds the closing force (anticlockwise torque (closing torque)) caused by the water pressure on the lower part of the dam in fig. 1, if the dam rotates clockwise and opens in fig. 1, but according to the direction of water flow, the situation of reverse rotation exists, when the opening force reaches a torque balance point or above, the dam rotates around the dam rotating shaft, the bottom is opened, and water flows out. When the upstream water level of the dam body drops below the opening torque balance point, the dam rotates anticlockwise (rotates reversely) and is closed.
At present, the traditional turnover dam is mainly used for adjusting the torque characteristic of a dam body by adjusting the position of a turnover shaft and adding a part of balance weight on the dam, for example, a heavy object such as concrete is added below a rotating shaft, so that the closing torque is increased, and the opening water level is improved. The starting torque is increased and the starting water level is reduced by adding the counterweight at the top (the counterweight is arranged at different positions and the arm of force is different); however, this method is inconvenient and has poor adjustment precision. In addition, the dam state is usually located near the torque balance point, the dam will be closed, and the influence of the upstream water waves is serious.
Traditional board dam that turns over opens the water level and hardly adjusts after the construction, moreover because adopt full mechanical device, the dam body is blocked unable remote monitoring, only adopts other auxiliary device or on-the-spot to look over and just can discover.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a novel board dam is turned over to magnetic force can control the degree that its dam body was opened.
A novel magnetic force turns over board dam, wherein: the dam comprises a dam body and a concrete baffle fixed on the river channel ground, wherein the concrete baffle is a triangular cylinder with an axis transversely arranged on the river channel ground, the radial section of the concrete baffle is triangular, the axis of the triangular cylinder is horizontal or parallel to the river channel ground, a first surface of the outer wall of the side surface of the triangular cylinder is arranged on the river channel ground, a second surface of the outer wall of the side surface of the triangular cylinder is a water-facing surface, and a third surface of the outer wall of the side surface of the triangular cylinder is a water-receiving surface; the middle part of the dam body is provided with a dam body rotating shaft along the horizontal line, the dam body rotating shaft is rotatably connected with the dam body by the water surface, and two ends of the dam body rotating shaft are respectively and correspondingly fixed on two banks of the river channel; the bottom of the dam body is pressed against the water facing side of the second face of the concrete baffle body by incoming water; the bottom of the water-receiving surface of the dam body is provided with an electromagnet, and an iron plate or other magnetic materials facing the electromagnet are embedded in the water-facing surface of the concrete baffle body; novel magnetic force turns over board dam still includes electromagnet control module, and electromagnet control module's signal output part connects the power input end of electro-magnet.
Novel board dam is turned over to magnetic force, wherein: the electromagnet control module comprises a control computer and an electromagnet controller, wherein the control signal output end of the computer is connected with the control signal input end of the electromagnet controller, the power end of the electromagnet controller is connected with an external power supply, and the electromagnet control signal output ends of the electromagnet controller are respectively connected with the power input ends of corresponding electromagnets.
Novel board dam is turned over to magnetic force, wherein: the electromagnet controller is a DL205 type PLC controller, the PLC controller comprises a communication module, a CPU and a relay control module, the communication module is used for network communication and is in communication connection with a control computer, a communication port of the CPU of the PLC controller is connected with the communication module, a control signal output end of the CPU of the PLC controller is connected with a control signal input end of the relay control module, the relay control module comprises more than one relay normally-open contact, and the relay normally-open contacts are connected in series in a connection loop of the electromagnet and a power supply.
Novel board dam is turned over to magnetic force, wherein: the electromagnet control module comprises more than two PLC controllers, the communication port of the control computer is correspondingly connected with the communication port of each PLC controller communication module through a data bus/network, the power end of each PLC control chip is connected with an external power supply, and the normally open contact of the corresponding relay of each PLC control chip is respectively connected in series in the power supply loop of the corresponding electromagnet.
Novel board dam is turned over to magnetic force, wherein: the electromagnetic iron controller is a DCS controller, a communication port of the DCS controller is in communication connection with a control computer, a control signal output end of the DCS controller is in control connection with a relay module, and a normally open contact of the relay module is connected in series in a connecting loop of the electromagnetic iron and the power supply.
A novel magnetic force turns over board dam, wherein: the dam comprises a dam body and a concrete baffle fixed on the river channel ground, wherein the concrete baffle is a triangular cylinder with an axis transversely arranged on the river channel ground, the radial section of the concrete baffle is triangular, the axis of the triangular cylinder is horizontal or parallel to the river channel ground, a first surface of the outer wall of the side surface of the triangular cylinder is arranged on the river channel ground, a second surface of the outer wall of the side surface of the triangular cylinder is a water-facing surface, and a third surface of the outer wall of the side surface of the triangular cylinder is a water-receiving surface; the middle part of the dam body is provided with a dam body rotating shaft along the horizontal line, the dam body rotating shaft is rotatably connected with the dam body by the water surface, and two ends of the dam body rotating shaft are respectively and correspondingly fixed on two banks of the river channel; the bottom of the dam body is pressed against the water facing side of the second face of the concrete baffle body by incoming water; iron plates or other magnetic materials are arranged at the bottom of the water receiving surface of the dam body, an electromagnet is embedded in the water facing surface of the concrete baffle body, and the electromagnet faces the iron plates or other magnetic materials at the bottom of the water receiving surface of the dam body; novel magnetic force turns over board dam still includes electromagnet control module, and electromagnet control module's signal output part connects the power input end of electro-magnet.
Novel board dam is turned over to magnetic force, wherein: the electromagnet control module comprises a control computer and an electromagnet controller, wherein the control signal output end of the computer is connected with the control signal input end of the electromagnet controller, the power end of the electromagnet controller is connected with an external power supply, and the electromagnet control signal output ends of the electromagnet controller are respectively connected with the power input ends of corresponding electromagnets.
Novel board dam is turned over to magnetic force, wherein: the electromagnet controller is a DL205 type PLC controller, the PLC controller comprises a communication module, a CPU and a relay control module, the communication module is used for network communication and is in communication connection with a control computer, a communication port of the CPU of the PLC controller is connected with the communication module, a control signal output end of the CPU of the PLC controller is connected with a control signal input end of the relay control module, the relay control module comprises more than one relay normally-open contact, and the relay normally-open contacts are connected in series in a connection loop of the electromagnet and a power supply.
Novel board dam is turned over to magnetic force, wherein: the electromagnet control module comprises more than two PLC controllers, the communication port of the control computer is correspondingly connected with the communication port of each PLC controller communication module through a data bus/network, the power end of each PLC control chip is connected with an external power supply, and the normally open contact of the corresponding relay of each PLC control chip is respectively connected in series in the power supply loop of the corresponding electromagnet.
Novel board dam is turned over to magnetic force, wherein: the electromagnetic iron controller is a DCS controller, a communication port of the DCS controller is in communication connection with a control computer, a control signal output end of the DCS controller is in control connection with a relay module, and a normally open contact of the relay module is connected in series in a connecting loop of the electromagnetic iron and the power supply. The utility model provides a pair of novel magnetic force turns over board dam through using magnetic force locking technique, realizes turning over the locking control of board dam, can adjust the water level height that turns over the board dam and open through the magnetic force size of adjusting the electro-magnet through the remote control electro-magnet.
Drawings
FIG. 1 is a schematic view of a conventional flap dam;
fig. 2 is a schematic diagram of the novel magnetic flap dam provided by the present invention;
fig. 3 is a schematic circuit diagram of the electromagnet control module of the magnetic flap dam of the present invention.
Detailed Description
The utility model provides a novel magnetic force turns over board dam, as shown in figure 2, including dam body 1, the concrete baffle 4 that is fixed in the river course ground, concrete baffle 4 is the triangle-shaped cylinder that the axis transversely arranged in the river course ground, the radial cross-section of concrete baffle 4 is triangle-shaped, the axis of triangle-shaped cylinder is for being level or parallel with river course ground 6, the first face of triangle-shaped cylinder side outer wall is arranged in the river course ground 6, the second face of triangle-shaped cylinder side outer wall is the upstream face, the third face of triangle-shaped cylinder side outer wall is the quilt face; the middle part of the dam body 1 is provided with a dam body rotating shaft 2 along the horizontal line, the dam body rotating shaft 2 is rotatably connected with the water receiving surface of the dam body 1, and two ends of the dam body rotating shaft 2 are respectively and correspondingly fixed on two banks of a river channel; the bottom of the dam body 1 is pressed against the water facing side of the second surface of the concrete baffle body 4 by incoming water; the bottom of the water-facing surface of the dam body 1 is provided with an electromagnet 3, and an iron plate or other magnetic materials 5 facing the electromagnet 3 are embedded in the water-facing surface of the concrete baffle body 4; novel magnetic force turns over board dam still includes electromagnet control module, and electromagnet control module's signal output part connects electromagnet 3's power input end.
The electromagnet control module, as shown in fig. 3, includes a control computer (computer) and an electromagnet controller, wherein a control signal output end of the computer is connected to a control signal input end of the electromagnet controller, a power end of the electromagnet controller is connected to an external power supply, and each electromagnet control signal output end of the electromagnet controller is respectively connected to a power input end of a corresponding electromagnet.
In this embodiment, the electromagnet controller is a DL205 type PLC controller, the PLC controller includes a communication module for network communication, a CPU and a relay control module, the communication module of the PLC controller is in communication connection with a control computer, a communication port of the CPU of the PLC controller is connected to the communication module, a control signal output end of the CPU of the PLC controller is connected to a control signal input end of the relay control module, the relay control module includes one or more normally open contacts of a relay, and the normally open contacts of the relay are connected in series in a connection loop between the electromagnet and a power supply.
Furthermore, the electromagnet control module can comprise more than two PLC controllers, the communication port of the control computer is correspondingly connected with the communication port of each PLC controller communication module through a data bus/network, the power end of each PLC controller is connected with an external power supply, and the normally open contacts of the corresponding relays of each PLC controller are respectively connected in series in the power supply loops of the corresponding electromagnets.
In addition, the electromagnet controller can also adopt a DCS controller, a communication port of the DCS controller is in communication connection with a control computer, a control signal output end of the DCS controller is in control connection with a relay module, and a normally open contact of the relay module is connected in series in a connection loop of the electromagnet and the power supply.
The utility model also provides another novel magnetic force flap dam, including the dam body 1, be fixed in the concrete baffle 4 on river course ground, concrete baffle 4 is the triangle-shaped cylinder that the axis transversely was arranged in river course subaerial, the radial cross-section of concrete baffle 4 is triangle-shaped, the axis of triangle-shaped cylinder is for the level or be parallel with river course ground, the first face of triangle-shaped cylinder side outer wall is arranged in on river course ground 6, the second face of triangle-shaped cylinder side outer wall is the upstream face, the third face of triangle-shaped cylinder side outer wall is the quilt face; the middle part of the dam body 1 is provided with a dam body rotating shaft 2 along the horizontal line, the dam body rotating shaft 2 is rotatably connected with the water receiving surface of the dam body 1, and two ends of the dam body rotating shaft 2 are respectively and correspondingly fixed on two banks of a river channel; the bottom of the dam body 1 is pressed against the water facing side of the second surface of the concrete baffle body 4 by incoming water; an iron plate or other magnetic materials 5 is arranged at the bottom of the water surface of the dam body 1, an electromagnet 3 is embedded in the water-facing surface of the concrete baffle body 4, and the electromagnet 3 faces the iron plate or other magnetic materials 5 at the bottom of the water surface of the dam body 1; novel magnetic force turns over board dam still includes electromagnet control module, and electromagnet control module's signal output part connects the power input end of electro-magnet.
The electromagnet control module comprises a control computer and an electromagnet controller, wherein the control signal output end of the computer is connected with the control signal input end of the electromagnet controller, the power end of the electromagnet controller is connected with an external power supply, and the electromagnet control signal output ends of the electromagnet controller are respectively connected with the power input ends of corresponding electromagnets.
The electromagnet controller is a DL205 type PLC controller, the PLC controller comprises a communication module, a CPU and a relay control module, the communication module is used for network communication and is in communication connection with a control computer, a communication port of the CPU of the PLC controller is connected with the communication module, a control signal output end of the CPU of the PLC controller is connected with a control signal input end of the relay control module, the relay control module comprises more than one relay normally-open contact, and the relay normally-open contacts are connected in series in a connection loop of the electromagnet and a power supply.
The electromagnet control module comprises more than two PLC controllers, the communication port of the control computer is correspondingly connected with the communication port of each PLC controller communication module through a data bus/network, the power end of each PLC control chip is connected with an external power supply, and the normally open contact of the corresponding relay of each PLC control chip is respectively connected in series in the power supply loop of the corresponding electromagnet.
The electromagnetic iron controller is a DCS controller, a communication port of the DCS controller is in communication connection with a control computer, a control signal output end of the DCS controller is in control connection with a relay module, and a normally open contact of the relay module is connected in series in a connecting loop of the electromagnetic iron and the power supply.
The utility model provides a magnetic force turns over board dam through using magnetic force locking technique, realizes turning over the locking control of board dam, can adjust the water level height that turns over the board dam and open through the magnetic force size of adjusting the electro-magnet through the remote control electro-magnet.
In the embodiment, an electromagnet or other magnetic devices are arranged at the lower part (or other parts, such as the side part) of the dam body to serve as an auxiliary adjusting device of the dam body, and the counterclockwise torque of the dam body can be adjusted by controlling and adjusting the suction force of the electromagnet through a remote computer, so that the clockwise torque required by opening the dam body is adjusted (the torque corresponds to the height of the water level during opening). And setting the opening direction of the dam body according to the river channel and the flowing water direction.
When the electromagnet or other magnetic devices are used as the torque adjusting device of the dam body, the electromagnet adopts finished products, each electromagnet provides certain (for example, 10 KN) suction force, a plurality of electromagnets are arranged at equal intervals along the length direction of the dam body, and the corresponding number of electromagnets is set according to specific conditions.
A plurality of electromagnets which are mutually independent are arranged on each turnover dam, and the electromagnets with different numbers are started to correspond to different turnover dams to start water levels. The power supply of each electromagnet is controlled by the switching value output by the relay of the PLC. The PLC communicates with the computer through a bus or network. Any relay output port of any PLC can be controlled through PLC control software or configuration software on a computer, any appointed electromagnet power supply can be turned off or turned on, and then the total magnetic force provided by electromagnets on all flap dams is controlled, and multi-stage adjustment of water level control of the flap dams is achieved.
If the analog quantity output module of the PLC is used for control, the adjustment of the magnetic force of the electromagnet with higher precision can be realized by adjusting the power supply voltage and the current of the electromagnet. However, in consideration of the actual control precision requirement on site, the high-precision adjustment of the attraction force of the electromagnet is not required in general.
The utility model discloses the dam body is opened the water level and is decided by the electromagnetic force size completely, can long-range quick adjustment, and the dam body is opened for the surface of a back side moreover, is difficult for being blocked by debris. In addition, whether the flap dam is opened or not can be indirectly monitored by monitoring whether the magnetic device is opened or not.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a novel board dam is turned over to magnetic force which characterized in that: the dam comprises a dam body and a concrete baffle fixed on the river channel ground, wherein the concrete baffle is a triangular cylinder with an axis transversely arranged on the river channel ground, the radial section of the concrete baffle is triangular, the axis of the triangular cylinder is horizontal or parallel to the river channel ground, a first surface of the outer wall of the side surface of the triangular cylinder is arranged on the river channel ground, a second surface of the outer wall of the side surface of the triangular cylinder is a water-facing surface, and a third surface of the outer wall of the side surface of the triangular cylinder is a water-receiving surface; the middle lower part of the dam body is provided with a dam body rotating shaft along the horizontal line, the dam body rotating shaft is rotatably connected with the dam body by the water surface, and two ends of the dam body rotating shaft are respectively and correspondingly fixed on two banks of the river channel; the bottom of the dam body is pressed against the water facing side of the second face of the concrete baffle body by incoming water; the bottom of the water-receiving surface of the dam body is provided with an electromagnet, and an iron plate or other magnetic materials facing the electromagnet are embedded in the water-facing surface of the concrete baffle body; novel magnetic force turns over board dam still includes electromagnet control module, and electromagnet control module's signal output part connects the power input end of electro-magnet.
2. The novel magnetic flap dam of claim 1, wherein: the electromagnet control module comprises a control computer and an electromagnet controller, wherein the control signal output end of the computer is connected with the control signal input end of the electromagnet controller, the power end of the electromagnet controller is connected with an external power supply, and the electromagnet control signal output ends of the electromagnet controller are respectively connected with the power input ends of corresponding electromagnets.
3. The novel magnetic force flap dam of claim 2, characterized in that: the electromagnet controller is a DL205 type PLC controller, the PLC controller comprises a communication module, a CPU and a relay control module, the communication module is used for network communication and is in communication connection with a control computer, a communication port of the CPU of the PLC controller is connected with the communication module, a control signal output end of the CPU of the PLC controller is connected with a control signal input end of the relay control module, the relay control module comprises more than one relay normally-open contact, and the relay normally-open contacts are connected in series in a connection loop of the electromagnet and a power supply.
4. The novel magnetic force flap dam of claim 3, characterized in that: the electromagnet control module comprises more than two PLC controllers, the communication port of the control computer is correspondingly connected with the communication port of each PLC controller communication module through a data bus/network, the power end of each PLC control chip is connected with an external power supply, and the normally open contact of the corresponding relay of each PLC control chip is respectively connected in series in the power supply loop of the corresponding electromagnet.
5. The novel magnetic force flap dam of claim 2, characterized in that: the electromagnetic iron controller is a DCS controller, a communication port of the DCS controller is in communication connection with a control computer, a control signal output end of the DCS controller is in control connection with a relay module, and a normally open contact of the relay module is connected in series in a connecting loop of the electromagnetic iron and the power supply.
6. The utility model provides a novel board dam is turned over to magnetic force which characterized in that: the dam comprises a dam body and a concrete baffle fixed on the river channel ground, wherein the concrete baffle is a triangular cylinder with an axis transversely arranged on the river channel ground, the radial section of the concrete baffle is triangular, the axis of the triangular cylinder is horizontal or parallel to the river channel ground, a first surface of the outer wall of the side surface of the triangular cylinder is arranged on the river channel ground, a second surface of the outer wall of the side surface of the triangular cylinder is a water-facing surface, and a third surface of the outer wall of the side surface of the triangular cylinder is a water-receiving surface; the middle part of the dam body is provided with a dam body rotating shaft along the horizontal line, the dam body rotating shaft is rotatably connected with the dam body by the water surface, and two ends of the dam body rotating shaft are respectively and correspondingly fixed on two banks of the river channel; the bottom of the dam body is pressed against the water facing side of the second face of the concrete baffle body by incoming water; iron plates or other magnetic materials are arranged at the bottom of the water receiving surface of the dam body, an electromagnet is embedded in the water facing surface of the concrete baffle body, and the electromagnet faces the iron plates or other magnetic materials at the bottom of the water receiving surface of the dam body; novel magnetic force turns over board dam still includes electromagnet control module, and electromagnet control module's signal output part connects the power input end of electro-magnet.
7. The novel magnetic force flap dam of claim 6, characterized in that: the electromagnet control module comprises a control computer and an electromagnet controller, wherein the control signal output end of the computer is connected with the control signal input end of the electromagnet controller, the power end of the electromagnet controller is connected with an external power supply, and the electromagnet control signal output ends of the electromagnet controller are respectively connected with the power input ends of corresponding electromagnets.
8. The novel magnetic force flap dam of claim 7, characterized in that: the electromagnet controller is a DL205 type PLC controller, the PLC controller comprises a communication module, a CPU and a relay control module, the communication module is used for network communication and is in communication connection with a control computer, a communication port of the CPU of the PLC controller is connected with the communication module, a control signal output end of the CPU of the PLC controller is connected with a control signal input end of the relay control module, the relay control module comprises more than one relay normally-open contact, and the relay normally-open contacts are connected in series in a connection loop of the electromagnet and a power supply.
9. The novel magnetic force flap dam of claim 8, characterized in that: the electromagnet control module comprises more than two PLC controllers, the communication port of the control computer is correspondingly connected with the communication port of each PLC controller communication module through a data bus/network, the power end of each PLC control chip is connected with an external power supply, and the normally open contact of the corresponding relay of each PLC control chip is respectively connected in series in the power supply loop of the corresponding electromagnet.
10. The novel magnetic force flap dam of claim 7, characterized in that: the electromagnetic iron controller is a DCS controller, a communication port of the DCS controller is in communication connection with a control computer, a control signal output end of the DCS controller is in control connection with a relay module, and a normally open contact of the relay module is connected in series in a connecting loop of the electromagnetic iron and the power supply.
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| CN201922048327.7U CN211395599U (en) | 2019-11-25 | 2019-11-25 | Novel magnetic force turns over board dam |
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| CN201922048327.7U CN211395599U (en) | 2019-11-25 | 2019-11-25 | Novel magnetic force turns over board dam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110989701A (en) * | 2019-11-25 | 2020-04-10 | 刘炫 | Magnetic force turns over board dam and novel magnetic force turns over board dam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110989701A (en) * | 2019-11-25 | 2020-04-10 | 刘炫 | Magnetic force turns over board dam and novel magnetic force turns over board dam |
| CN110989701B (en) * | 2019-11-25 | 2023-05-26 | 刘炫 | Magnetic force turns over board dam and novel magnetic force turns over board dam |
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