Parallel operation liquid level automatic balancing device of twin rudder system of near-shore maritime surveying and mapping service ship

Abstract

The utility model discloses a double rudder machine parallel operation liquid level automatic balancing device of inshore maritime affairs surveying and mapping official business ship, including balance pipeline and two -way hydraulic oil pump system, the bottom of two sets of rudder machine system's hydraulic oil tank is communicated respectively in the both ends of balance pipeline, and the on-off of balance pipeline is controlled by solenoid valve, the contactor of solenoid valve and two sets of hydraulic pump's rudder machine system forms series circuit, two -way hydraulic oil pump system includes two -way hydraulic oil pump and float liquid level switch. Utilize the utility model can effectively eliminate the phenomenon that one oil tank oil level is too high and another oil tank oil level is too low caused by the uneven oil return when double rudder parallel operation, thereby can effectively improve the reliability of rudder machine parallel operation under the specific sea conditions, guarantees the ship navigation operation safety.

Description

Technical Field

[0001] This invention relates to the field of marine surveying vessel technology, specifically to an automatic liquid level balancing device for a nearshore marine surveying vessel with dual rudders operating in parallel. Background Technology

[0002] Steering gear is a critical piece of equipment in the field of ship navigation, and its reliability directly affects the safety of ship navigation. This is especially true for surveying vessels of maritime surveying centers, which undertake tasks such as hydrographic surveying and maritime emergency response. Their navigation areas are mostly undeveloped waters without any nautical charts or data, and the sea conditions during emergency missions are often accompanied by strong winds and rough seas. Therefore, the importance of steering gear for maritime surveying vessels is self-evident.

[0003] According to relevant navigation regulations, vessels must operate in a dual-pump mode, i.e., a dual-steering gear parallel operation mode, when navigating in adverse and complex sea conditions such as entering or leaving ports or narrow waterways. Theoretically, this dual-steering gear parallel operation mode will double the steering speed. However, the performance of steering gear components inevitably changes during long-term use, causing different return oil resistance between the two steering gears. This leads to hydraulic oil in one system's hydraulic oil tank leaking into the other system's oil tank through the steering cylinder. Consequently, the oil level in one tank rises higher and higher, and excessive hydraulic oil may even overflow from the vent and fall into the bottom of the steering gear compartment, while the oil level in the other tank drops lower and lower until an alarm is triggered. This causes the steering gear system to malfunction, the vessel to lose maneuverability, and may even lead to a major accident. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model aims to provide an automatic liquid level balancing device for a near-shore maritime surveying vessel with dual rudders operating in parallel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic liquid level balancing device for parallel operation of dual steering gears on a nearshore maritime surveying vessel, including balancing pipelines and a bidirectional hydraulic oil pump system;

[0007] The two ends of the balance pipeline are respectively connected to the bottom of the hydraulic oil tanks of the two servo motor systems. The opening and closing of the balance pipeline is controlled by a solenoid valve. The solenoid valve and the normally open contact of the contactor of the hydraulic pump of the two servo motor systems form a series circuit.

[0008] The bidirectional hydraulic pump system includes a bidirectional hydraulic pump and float level switches. The inlet and outlet of the bidirectional hydraulic pump are connected to two hydraulic oil tanks via oil pipes. The two hydraulic oil tanks are used to store hydraulic oil, and each hydraulic oil tank is equipped with at least two actuating contacts of float level switches. The actuating contacts of the two float level switches in the two hydraulic oil tanks correspond to the over-limit oil level and the normal oil level, respectively, from high to low. The actuating contact of the float level switch in one hydraulic oil tank corresponding to the over-limit oil level is used to control the on / off of the forward rotation circuit of the bidirectional hydraulic pump, and the actuating contact of the float level switch in the other hydraulic oil tank corresponding to the over-limit oil level is used to control the on / off of the reverse rotation circuit of the bidirectional hydraulic pump.

[0009] Furthermore, the balancing pipeline includes two branch pipes and one bypass pipe. One end of each of the two branch pipes is connected to the bottom of the hydraulic oil tanks of the two servo motor systems via manual shut-off valve one and manual shut-off valve two, respectively. The other ends of the two branch pipes are connected to each other via manual shut-off valve three. The two ends of the bypass pipe are connected to the two branch pipes, respectively, and the solenoid valve is located on the bypass pipe.

[0010] Furthermore, both sections of the pipe include interconnected horizontal and vertical sections, with the upper end of the vertical section connected to the bottom of the hydraulic tank, and the transition between the horizontal and vertical sections being arc-shaped.

[0011] Furthermore, the automatic liquid level balancing device for the parallel operation of the dual steering gears of the nearshore maritime surveying vessel also includes an alarm circuit. Each of the two hydraulic oil tanks is equipped with three float level switch contacts, which correspond to the alarm oil level, over-limit oil level, and normal oil level from high to low. The float level switches corresponding to the alarm oil level in the two hydraulic oil tanks are connected in parallel to the alarm circuit.

[0012] The beneficial effects of this utility model are as follows: This utility model can effectively eliminate the phenomenon of uneven oil return during the parallel operation of dual rudders, which causes the oil level in one oil tank to be too high while the oil level in the other oil tank is too low. This can effectively improve the reliability of the rudder motors operating in parallel under specific sea conditions and ensure the safety of ship navigation operations. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the automatic liquid level balancing device with dual servo motors operating in parallel, as described in this utility model embodiment.

[0014] Figure 2 This is a schematic diagram showing the series connection of the normally open contacts of the contactors of the solenoid valve and the hydraulic pumps of the two servo motor systems in an embodiment of this utility model.

[0015] Figure 3 This is a schematic diagram of the control circuit structure of the bidirectional hydraulic oil pump in an embodiment of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0017] This embodiment provides an automatic liquid level balancing device for a near-shore maritime surveying vessel with dual rudder motors operating in parallel, such as... Figure 1 As shown, it includes a balance pipeline 100 and a two-way hydraulic oil pump system;

[0018] The two ends of the balance pipeline 100 are respectively connected to the bottom of the hydraulic oil tanks 200 and 300 of the two servo systems. The opening and closing of the balance pipeline 100 is controlled by solenoid valves (V1, V2). The solenoid valves and the normally open contacts (KM3, KM4) of the contactors of the hydraulic pumps of the two servo systems form a series circuit.

[0019] The bidirectional hydraulic pump system includes a bidirectional hydraulic pump 400 and float level switches. The inlet and outlet of the bidirectional hydraulic pump 400 are connected to two hydraulic oil tanks 200 and 300 respectively via oil pipes. The two hydraulic oil tanks 200 and 300 are used to store hydraulic oil, and each of the two hydraulic oil tanks 200 and 300 is equipped with at least two actuating contacts of float level switches. The actuating contacts of the two float level switches 3 and 5, 4 and 6 in the two hydraulic oil tanks 200 and 300 respectively correspond to the over-limit oil level and the normal oil level from high to low. The actuating contact of the float level switch 3 in one hydraulic oil tank 200 corresponding to the over-limit oil level is used to control the on / off of the forward rotation circuit of the bidirectional hydraulic pump 400, and the actuating contact of the float level switch 4 in the other hydraulic oil tank 300 corresponding to the over-limit oil level is used to control the on / off of the reverse rotation circuit of the bidirectional hydraulic pump 400.

[0020] It should be noted that the actuation contacts of at least two float level switches in the hydraulic oil tank can be achieved by installing at least two float level switches with one actuating contact in the hydraulic oil tank, or by installing float switches with at least two actuating contacts in the hydraulic oil tank. This embodiment uses the former approach.

[0021] like Figure 1 , 2As shown, in this embodiment, there are two solenoid valves controlling the on / off state of the balance pipeline, namely V1 and V2. The normally open contacts of the hydraulic pumps of the two servo systems are represented as KM3 and KM4, respectively. Under normal operating conditions, the servo system operates in single-pump mode, that is, only one of the two servo systems (hereinafter referred to as servo system 1 and servo system 2) is in working state. Therefore, only one of the normally open contacts of the hydraulic pumps of the two servo systems is in the closed state. For example, when the hydraulic pump of servo system 1 is energized and starts to work, its normally open contact KM3 closes accordingly. When the hydraulic pump of servo system 2 is energized and starts to work, its normally open contact KM4 closes accordingly. At this time, the circuit formed by solenoid valves V1 and V2, contact KM3 and contact KM4 connected in series is not open. Therefore, solenoid valves V1 and V2 are in the open state, the balance pipeline 100 is cut off, and the hydraulic oil tanks 200 and 300 of the two servo systems are not connected to each other, thus ensuring the independence of the operation of a single servo system and preventing possible leakage in the hydraulic oil system of the other servo system from interfering with each other's operation. When the two pumps are operating in parallel, the hydraulic pumps of both steering gear systems are simultaneously energized and begin to work. Consequently, the normally open contacts KM3 and KM4 of the hydraulic pumps of both steering gear systems close, thereby connecting solenoid valves V1 and V2 and opening the balance line 100. This ensures that the oil levels in the hydraulic oil tanks 200 and 300 of the two steering gear systems remain consistent. This eliminates the problem of uneven oil return during parallel operation of the two steering gear systems, which could lead to an excessively high oil level in one hydraulic oil tank and an excessively low oil level in the other. This improves the reliability of the two steering gear systems operating in parallel under specific sea conditions and ensures the safety of ship navigation operations.

[0022] The bidirectional hydraulic pump system and the balancing pipeline are redundantly designed, together forming a dual-rudder parallel liquid level balancing device. For example... Figure 1 As shown, the hydraulic oil tank 200 on the right is called tank A, and the hydraulic oil tank 300 on the right is called tank B. The over-limit oil level and normal oil level in tank A are recorded as H1 and L1, respectively, corresponding to float level switches 3 and 5; the over-limit oil level and normal oil level in tank B are recorded as H2 and L2, respectively, corresponding to float level switches 4 and 6.

[0023] If the balancing pipeline fails to function properly, the oil level in one hydraulic tank may rise while the oil level in the other hydraulic tank falls. When the oil level in tank A rises to the over-limit level H1, the actuating contact of the float level switch corresponding to H1 in tank A closes, connecting the main circuit and forward rotation circuit of the bidirectional hydraulic pump. The bidirectional hydraulic pump then begins to rotate forward, pumping hydraulic oil from tank A to tank B, thus balancing the oil levels in the two hydraulic tanks. This continues until the hydraulic pump in tank A returns to below the normal oil level. At this point, the main circuit and forward rotation circuit of the bidirectional hydraulic pump disconnect, and the bidirectional hydraulic pump stops working. Conversely, when the oil level in cabinet B rises to the over-limit level H2, the corresponding H2 float level switch in cabinet B closes, connecting the main circuit and reversing circuit of the bidirectional hydraulic pump. The bidirectional hydraulic pump then reverses, pumping the hydraulic oil from cabinet B back to cabinet B, thus balancing the oil levels in the two hydraulic tanks. This continues until the hydraulic pump in cabinet A returns to below the normal oil level. At this point, the main circuit and reversing circuit of the bidirectional hydraulic pump disconnect, and the bidirectional hydraulic pump stops working.

[0024] Figure 3 A more detailed control circuit structure for the bidirectional hydraulic pump is given. WH1 and WH2 represent the operating contacts of the float level switches corresponding to the excessive oil levels in cabinets A and B, respectively, while WL1 and WL2 represent the operating contacts of the float level switches corresponding to the normal oil levels in cabinets A and B, respectively. When the hydraulic oil level in cabinet A reaches the over-limit level H1, the action contact WH1 closes, and the time-delay relay coil kt1 is energized (to prevent the ship from rocking and interfering with the control system). Three seconds later, the normally open contact KT1 of the time-delay relay closes, and the control circuit is connected by the normally open contact KT1, the already closed action contact WL1, the normally closed contact KM2 (KM2 is used for interlocking protection, just like the normally closed contact KM5 in the reverse circuit, to prevent the contactors KM5 and KM2 from being energized at the same time and causing a short circuit in the main circuit), and the coil km1. The normally open contact KM1 of the forward circuit closes for self-holding, and the normally open contact KM1' in the main circuit closes. The bidirectional hydraulic oil pump p rotates in the forward direction to pump the excess oil from cabinet A back to cabinet B until the oil level in cabinet A drops below the normal level L1. Then, the action contact WL1 opens, the coil km1 is de-energized, the normally open contact KM1' in the main circuit opens, and the bidirectional hydraulic oil pump p stops.

[0025] Conversely, if uneven oil return causes the oil level in cabinet B to rise while the oil level in cabinet A falls, when the hydraulic oil level in cabinet B reaches the over-limit level H2, the action contact WH2 closes, the time-delay relay coil kt2 is energized, and three seconds later, the normally open contact KT2 of the time-delay relay closes. The control circuit is connected by the normally open contact KT2, the already closed action contact WL2, the normally closed contact KM5, and the coil km2. The normally open contact KM6 of the reversing circuit closes for self-holding, and the normally open contact KM2' in the main circuit closes. The bidirectional hydraulic pump p rotates in the reverse direction to pump the excess oil from cabinet B back to cabinet A until the oil level in cabinet B drops below the normal level L2. Then, the action contact WL2 opens, the coil km2 is de-energized, the normally open contact KM2' in the main circuit opens, and the bidirectional hydraulic pump p stops.

[0026] In this embodiment, as Figure 1 As shown, the balancing pipeline 100 includes two branch pipes 101 and 102 and a bypass pipe 103. One end of the two branch pipes 101 and 102 is connected to the bottom of the hydraulic oil tanks 200 and 300 of the two servo motor systems via manual shut-off valve 104 and manual shut-off valve 205, respectively. The other ends of the two branch pipes 101 and 102 are connected to each other via manual shut-off valve 306. The two ends of the bypass pipe 103 are connected to the two branch pipes 101 and 102, respectively. The solenoid valves V1 and V2 are installed on the bypass pipe 103. Manual shut-off valve 104 and manual shut-off valve 205 are kept normally open, while manual shut-off valve 306 is kept normally closed. Manual shut-off valve 104, manual shut-off valve 205, and manual shut-off valve 306 are mainly used for emergency operation.

[0027] More specifically, in this embodiment, each of the two branch pipes 101 and 102 includes a transverse section 107 and a vertical section 108 that are interconnected. The upper end of the vertical section 108 is connected to the bottom of the hydraulic oil tank, and the transition portion between the transverse section 107 and the vertical section 108 is arc-shaped. Making the transition portion between the transverse section and the vertical section arc-shaped can reduce the resistance to the flow of hydraulic oil.

[0028] Furthermore, in this embodiment, the dual-steering motor parallel operation automatic liquid level balancing device also includes an alarm circuit. Each of the two hydraulic oil tanks is equipped with three float level switch contacts, which, from high to low, correspond to the alarm oil level, over-limit oil level, and normal oil level, respectively. The float level switches corresponding to the alarm oil level in the two hydraulic oil tanks are connected in parallel to the alarm circuit. Figure 1 As shown, the alarm oil level in cabinet A is recorded as K1, and the alarm oil level in cabinet B is recorded as K2. The float level switch 1 corresponds to K1, and the float level switch 2 corresponds to K2.

[0029] By setting up an alarm circuit, if the balancing device fails and the oil level in tank A or B continues to rise to the alarm level, the contact of the float level switch corresponding to the alarm level will close, activating the alarm circuit and generating an audible and visual alarm signal to remind the engine room personnel that the hydraulic tank oil level has exceeded the limit and needs to be addressed promptly. At this time, the personnel can open the manual shut-off valve three of the balancing pipeline to connect the two hydraulic tanks in an emergency, ensuring that the oil levels in the two tanks are balanced, and then troubleshoot the fault promptly at an appropriate time.

[0030] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this utility model.

Claims

1. An automatic liquid level balancing device for a near-shore maritime surveying vessel with dual rudder motors operating in parallel, characterized in that, Including a balancing pipeline and a two-way hydraulic pump system; The two ends of the balance pipeline are respectively connected to the hydraulic oil tanks of the two servo motor systems. The opening and closing of the balance pipeline is controlled by a solenoid valve. The solenoid valve and the normally open contact of the contactor of the hydraulic pump of the two servo motor systems form a series circuit. The bidirectional hydraulic pump system includes a bidirectional hydraulic pump and float level switches. The inlet and outlet of the bidirectional hydraulic pump are connected to two hydraulic oil tanks via oil pipes. The two hydraulic oil tanks are used to store hydraulic oil, and each hydraulic oil tank is equipped with at least two actuating contacts of float level switches. The actuating contacts of the two float level switches in the two hydraulic oil tanks correspond to the over-limit oil level and the normal oil level, respectively, from high to low. The actuating contact of the float level switch in one hydraulic oil tank corresponding to the over-limit oil level is used to control the on / off of the forward rotation circuit of the bidirectional hydraulic pump, and the actuating contact of the float level switch in the other hydraulic oil tank corresponding to the over-limit oil level is used to control the on / off of the reverse rotation circuit of the bidirectional hydraulic pump.

2. The apparatus according to claim 1, characterized in that, The balancing pipeline includes two branch pipes and one bypass pipe. One end of each branch pipe is connected to the bottom of the hydraulic oil tank of the two servo systems via manual shut-off valve one and manual shut-off valve two, respectively. The other ends of the two branch pipes are connected to each other via manual shut-off valve three. The two ends of the bypass pipe are connected to the two branch pipes, respectively. The solenoid valve is located on the bypass pipe.

3. The apparatus according to claim 2, characterized in that, Both sections of the pipe include interconnected horizontal and vertical sections. The upper end of the vertical section is connected to the bottom of the hydraulic tank, and the transition between the horizontal and vertical sections is arc-shaped.

4. The apparatus according to claim 1, characterized in that, It also includes an alarm circuit. Each of the two hydraulic oil tanks is equipped with three float level switch contacts. The three float level switch contacts, from high to low, correspond to the alarm oil level, the over-limit oil level, and the normal oil level, respectively. The float level switch contacts corresponding to the alarm oil level in the two hydraulic oil tanks are connected in parallel to the alarm circuit.

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