Hydraulic interlock control system for ship loading and unloading arm

Abstract

The application discloses a hydraulic interlocking control system for a ship loading and unloading arm, which comprises five working states: a normal loading and unloading state, an ERC ball valve closed state, an ERC hoop opened state, an ERC hoop closed state and an ERC ball valve opened state; a switch valve 1, a switch valve 2, a double ball valve switch electromagnetic valve and a double ball valve oil cylinder. When the loading and unloading arm is in the normal loading and unloading state, the double ball valve oil cylinder is opened to make the switch valve 1 in a locked state, and at this time, the ERC hoop oil cylinder cannot be opened in any case, thereby ensuring the safe loading and unloading of the unloading arm. When the ship manifold exceeds the maximum envelope range of the loading and unloading arm, the double ball valve oil cylinder is closed to make the switch valve 1 in an opened state, and then the ERC hoop oil cylinder is opened to make the unloading arm separated from the ship manifold flange. Since the switch valve 2 is switched to the locked state after the ERC hoop oil cylinder is opened, at this time, the double ball valve oil cylinder cannot be opened in any case. The two states are mutually redundant.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of fluid and automation, and particularly relates to a hydraulic interlocking control system for fluid loading and unloading equipment, such as LNG, oil products, chemical media, and the like. BACKGROUND

[0002] When an emergency occurs or a fire breaks out on site, the ERC causes the arm and the ship to separate.

[0003] To avoid the lack of interlocking in the system circuit, the operator may misoperate to cause the ERC to separate during normal loading and unloading, thereby causing chemical media leakage, pollution, and personnel casualties. SUMMARY

[0004] Based on the existing problems of the hydraulic system, through repeated research and testing, a hydraulic interlocking control system circuit is designed to comprehensively solve this problem.

[0005] The technical scheme of the present application is a hydraulic interlocking control system for a ship loading and unloading arm, which includes five working states.

[0006] Normal loading and unloading state:

[0007] The oil inlet P pipeline is divided into two routes, the first route of the oil inlet P pipeline is connected in sequence with a pressure reducing valve, a double ball valve switch solenoid valve left position, a second switch valve, and a double ball valve cylinder right cavity; the circuit passes through the double ball valve switch solenoid valve to the oil outlet T; the second route of the oil inlet P pipeline is connected in sequence with a second pressure reducing valve, a clamp switch solenoid valve right position, and an ERC clamp cylinder left cavity; the circuit passes in sequence through a manual control box MRSD, a first switch valve, and a clamp switch solenoid valve to the oil outlet T.

[0008] ERC ball valve closed state:

[0009] The oil inlet P pipeline is divided into two routes, the first route of the oil inlet P pipeline is connected in sequence with a pressure reducing valve, a double ball valve switch solenoid valve right position, and a double ball valve cylinder left cavity; the circuit passes in sequence through a second switch valve and a double ball valve switch solenoid valve to the oil outlet T; the second route of the oil inlet P pipeline is connected in sequence with a second pressure reducing valve, a clamp switch solenoid valve right position, and an ERC clamp cylinder left cavity; the circuit passes in sequence through a manual control box MRSD, a first switch valve, and a clamp switch solenoid valve to the oil outlet T.

[0010] ERC clamp open state:

[0011] The inlet P pipeline is divided into two routes, the first route of the inlet P pipeline is connected in sequence with a pressure reducing valve, a double ball valve switch electromagnetic valve right position, and a double ball valve cylinder left cavity; a return route is in sequence through a second switch valve, the double ball valve switch electromagnetic valve to an outlet T; the second route of the inlet P pipeline is in sequence connected with a second pressure reducing valve, a clamp switch electromagnetic valve left position, a first switch valve, a manual control box MRSD, and an ERC clamp cylinder right cavity; a return route is in sequence through the clamp switch electromagnetic valve to the outlet T.

[0012] ERC clamp tightening state:

[0013] The inlet P pipeline is divided into two routes, the first route of the inlet P pipeline is connected in sequence with a pressure reducing valve, a double ball valve switch electromagnetic valve right position, and a double ball valve cylinder left cavity; a return route is in sequence through a second switch valve, the double ball valve switch electromagnetic valve to an outlet T; the second route of the inlet P pipeline is in sequence connected with a second pressure reducing valve, a clamp switch electromagnetic valve left position, a first switch valve, a manual control box MRSD, and an ERC clamp cylinder right cavity; a return route is in sequence through the clamp switch electromagnetic valve to the outlet T.

[0014] ERC ball valve opening state:

[0015] The inlet P pipeline is divided into two routes, the first route of the inlet P pipeline is connected in sequence with a pressure reducing valve, a double ball valve switch electromagnetic valve left position, a second switch valve, and a double ball valve cylinder right cavity; a return route is in sequence through the double ball valve switch electromagnetic valve to an outlet T; the second route of the inlet P pipeline is in sequence connected with a second pressure reducing valve, a clamp switch electromagnetic valve right position, and an ERC clamp cylinder left cavity; a return route is in sequence through a manual control box MRSD, a first switch valve, the clamp switch electromagnetic valve to the outlet T.

[0016] Further, in the normal loading and unloading state: when the ERC clamp cylinder is in the clamping state, the second switch valve is turned on, at this time, the ERC ball valve is controlled to open or close by switching the double ball valve switch electromagnetic valve; when the ERC ball valve is not closed in place, the first switch valve will not be turned on, the ERC ball valve switch electromagnetic valve is switched to the open state, and the ERC clamp will not be opened.

[0017] Further, in the ERC ball valve closed state: when the ERC ball valve is closed in place, the first switch valve is turned on, the ERC ball valve switch electromagnetic valve is switched to the open state, and the ERC clamp can be opened.

[0018] Further, in the ERC clamp open state: due to the turn-on of the first switch valve, the ERC clamp is opened, and when the ERC clamp is opened, the second switch valve is reset, at this time, the ERC ball valve opening oil circuit is cut off, the ERC ball valve switch electromagnetic valve is switched to the open state, and the ERC ball valve cannot be opened.

[0019] Further, in the ERC clamping state, the clamping switch solenoid valve is switched to make the clamping closed, and the second switch valve is connected when the clamping is in place, and at this time, the ball valve opening operation can be performed.

[0020] Further, in the ERC ball valve opening state, the second switch valve is connected, and the ERC ball valve switch solenoid valve is switched to open the ERC ball valve.

[0021] The present application has the following technical effects: the present application adds the first switch valve, the second switch valve, the double ball valve switch solenoid valve and the double ball valve oil cylinder, and the ball valve action and the clamping action are redundant to each other. The system is reliable, safe, easy to maintain, and avoids the occurrence of major accidents caused by the ball valve not being closed and the clamping being opened or the clamping not being closed and the ball valve being opened. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a normal loading and unloading process state diagram;

[0023] Figure 2 is an ERC ball valve closed state diagram;

[0024] Figure 3 is an ERC clamping open state diagram;

[0025] Figure 4 is an ERC clamping tightening state diagram;

[0026] Figure 5 is an ERC double ball valve open state diagram. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0028] As shown in the figure, the normal loading and unloading process is as follows: the inlet P pipeline is divided into two paths: Figure 1

[0029] The first path of the inlet P pipeline is connected in turn to a pressure reducing valve, a double ball valve switch solenoid valve left position, a second switch valve, a double ball valve oil cylinder right cavity; and the return circuit passes through the double ball valve switch solenoid valve to the outlet T;

[0030] The second path of the inlet P pipeline is connected in turn to a second pressure reducing valve, a clamping switch solenoid valve right position, an ERC clamping oil cylinder left cavity; and the return circuit passes in turn through a manual control box MRSD, a first switch valve, a clamping switch solenoid valve to the outlet T;

[0031] The above-mentioned second switch valve is also mechanically connected to the ERC clamping oil cylinder.

[0032] ​When the ERC clamp cylinder is in the clamping state, the second switch valve is turned on, and at this time the ERC ball valve can be controlled to open or close by switching the double ball valve switch solenoid valve. When the ERC ball valve is not closed in place, the first switch valve will not be turned on, the ERC ball valve switch solenoid valve is switched to the open state, and the ERC clamp will not open.

[0033] As shown in the figure, the ERC ball valve closed state: the inlet P pipeline is divided into two routes: Figure 2

[0034] The first route of the inlet P pipeline is connected in turn to the pressure reducing valve, the double ball valve switch solenoid valve right position, and the double ball valve cylinder left cavity; the return circuit is connected in turn to the second switch valve, the double ball valve switch solenoid valve, and the oil outlet T;

[0035] The second route of the inlet P pipeline is connected in turn to the second pressure reducing valve, the clamp switch solenoid valve right position, and the ERC clamp cylinder left cavity; the return circuit is connected in turn to the manual control box MRSD, the first switch valve, the clamp switch solenoid valve, and the oil outlet T;

[0036] When the ERC ball valve is closed in place, the first switch valve is turned on, and the ERC ball valve switch solenoid valve is switched to the open state, and the ERC clamp can be opened.

[0037] In the above two states (normal loading and unloading process and ERC ball valve closed state), the ball valve is not closed in place, and the clamp is in the interlocking function that cannot be opened.

[0038] As shown in the figure, the ERC clamp open state: the inlet P pipeline is divided into two routes: Figure 3

[0039] The first route of the inlet P pipeline is connected in turn to the pressure reducing valve, the double ball valve switch solenoid valve right position, and the double ball valve cylinder left cavity; the return circuit is connected in turn to the second switch valve, the double ball valve switch solenoid valve, and the oil outlet T;

[0040] The second route of the inlet P pipeline is connected in turn to the second pressure reducing valve, the clamp switch solenoid valve left position, the first switch valve, the manual control box MRSD, and the ERC clamp cylinder right cavity; the return circuit is connected in turn to the clamp switch solenoid valve and the oil outlet T;

[0041] Due to the turn-on of the first switch valve, the ERC clamp is opened, and when the ERC clamp is opened, the second switch valve is reset, at this time the ERC ball valve opening oil circuit is cut off, the ERC ball valve switch solenoid valve is switched to the open state, and the ERC ball valve still cannot be opened.

[0042] As shown in the figure, the ERC clamp tightening state: the inlet P pipeline is divided into two routes: Figure 4

[0043] ​​​The first route of the inlet P pipeline is connected with a pressure reducing valve, a double ball valve switch electromagnetic valve right position and a double ball valve cylinder left cavity in sequence; and the return route is connected with a second switch valve, a double ball valve switch electromagnetic valve and an outlet T in sequence.

[0044] The second route of the inlet P pipeline is connected with a second pressure reducing valve, a clamp switch electromagnetic valve right position and an ERC clamp cylinder left cavity in sequence; and the return route is connected with a manual control box MRSD, a first switch valve, a clamp switch electromagnetic valve and an outlet T in sequence.

[0045] The clamp control electromagnetic valve is switched to make the clamp closed, and the second switch valve is connected when the clamp is closed in place, so that the ball valve opening operation can be performed.

[0046] In the above Figures 3-4 state, the clamp is not completely reset, and the ball valve is in the interlocking function that cannot be opened.

[0047] As shown in Figure 5 , the ERC ball valve opening state: the inlet P pipeline is divided into two routes:

[0048] The first route of the inlet P pipeline is connected with a pressure reducing valve, a double ball valve switch electromagnetic valve left position, a second switch valve and a double ball valve cylinder right cavity in sequence; and the return route is connected with a double ball valve switch electromagnetic valve and an outlet T in sequence.

[0049] The second route of the inlet P pipeline is connected with a second pressure reducing valve, a clamp switch electromagnetic valve right position and an ERC clamp cylinder left cavity in sequence; and the return route is connected with a manual control box MRSD, a first switch valve, a clamp switch electromagnetic valve and an outlet T in sequence.

[0050] The ERC ball valve switch electromagnetic valve is switched to make the ERC ball valve open due to the second switch valve being connected.

[0051] The present application adds a hydraulic control reversing valve, so that when the ERC is separated, part of it can be switched to the driving mode through the electric control electromagnetic valve, and the other part can be switched to the driving mode through another hydraulic circuit, the floating oil circuit is cut off, and the hydraulic system is forced to switch to the driving mode, and the two modes are redundant. The system is reliable, safe, easy to maintain, and avoids the occurrence of major accidents caused by the inability to switch to the driving mode after separation.

[0052] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application is defined with respect to the appended claims.

Claims

1. A hydraulic interlock control system for a marine loading and unloading arm, characterized by, Five working states are included: Normal loading and unloading state: The inlet P pipeline is divided into two routes, the first route of the inlet P pipeline is connected with the pressure reducing valve, the double ball valve switch electromagnetic valve left, the second switch valve, the double ball valve cylinder right cavity in turn; the circuit passes through the double ball valve switch electromagnetic valve to the outlet T; the second route of the inlet P pipeline is connected with the second pressure reducing valve, the clamp switch electromagnetic valve right, the ERC clamp cylinder left cavity in turn; the circuit passes through the manual control box MRSD, the first switch valve, the clamp switch electromagnetic valve to the outlet T in turn; ERC ball valve closed state: The inlet P pipeline is divided into two routes, the first route of the inlet P pipeline is connected with the pressure reducing valve, the double ball valve switch electromagnetic valve right, the double ball valve cylinder left cavity in turn; the circuit passes through the second switch valve, the double ball valve switch electromagnetic valve to the outlet T in turn; the second route of the inlet P pipeline is connected with the second pressure reducing valve, the clamp switch electromagnetic valve right, the ERC clamp cylinder left cavity in turn; the circuit passes through the manual control box MRSD, the first switch valve, the clamp switch electromagnetic valve to the outlet T in turn; ERC clamp open state: The inlet P pipeline is divided into two routes, the first route of the inlet P pipeline is connected with the pressure reducing valve, the double ball valve switch electromagnetic valve right, the double ball valve cylinder left cavity in turn; the circuit passes through the second switch valve, the double ball valve switch electromagnetic valve to the outlet T in turn; the second route of the inlet P pipeline is connected with the second pressure reducing valve, the clamp switch electromagnetic valve left, the first switch valve, the manual control box MRSD, the ERC clamp cylinder right cavity in turn; the circuit passes through the clamp switch electromagnetic valve to the outlet T; ERC clamp tightening state: The inlet P pipeline is divided into two routes, the first route of the inlet P pipeline is connected with the pressure reducing valve, the double ball valve switch electromagnetic valve right, the double ball valve cylinder left cavity in turn; the circuit passes through the second switch valve, the double ball valve switch electromagnetic valve to the outlet T in turn; the second route of the inlet P pipeline is connected with the second pressure reducing valve, the clamp switch electromagnetic valve right, the ERC clamp cylinder left cavity in turn; the circuit passes through the manual control box MRSD, the first switch valve, the clamp switch electromagnetic valve to the outlet T in turn; ERC ball valve open state: The inlet P pipeline is divided into two routes, the first route of the inlet P pipeline is connected with the pressure reducing valve, the double ball valve switch electromagnetic valve left, the second switch valve, the double ball valve cylinder right cavity in turn; the circuit passes through the double ball valve switch electromagnetic valve to the outlet T in turn; the second route of the inlet P pipeline is connected with the second pressure reducing valve, the clamp switch electromagnetic valve right, the ERC clamp cylinder left cavity in turn; the circuit passes through the manual control box MRSD, the first switch valve, the clamp switch electromagnetic valve to the outlet T in turn; In the normal loading and unloading state, when the ERC clamp cylinder is in the clamping state, the second switch valve is connected, at this time, the ERC ball valve is opened or closed by switching the double ball valve switch electromagnetic valve; when the ERC ball valve is not closed in place, the first switch valve will not be connected, at this time, even if the ERC ball valve switch electromagnetic valve is switched to the open state, the ERC clamp will not open; In the ERC ball valve closed state, when the ERC ball valve is closed in place, the first switch valve is connected, at this time, the ERC ball valve switch electromagnetic valve is switched to the open state, at this time, the ERC clamp can be opened by pressing the ERC clamp open button. ERC embrace open state, because the first switch valve is on, so that the ERC embrace open, when the ERC embrace open make the second switch valve reset, at this time the ERC ball valve open oil circuit is cut off, at this time switch ERC ball valve switch solenoid valve to open state, ERC ball valve still can not open; ERC embrace closed state, switch embrace switch solenoid valve make embrace closed, when embrace closed in place make the second switch valve is on, at this time can be carried out ball valve open operation.

2. A hydraulic interlock control system for a shipboard handling boom as defined in claim 1, wherein, ERC ball valve open state, because the second switch valve is on, switch ERC ball valve switch solenoid valve to open state make ERC ball valve open.

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