CN102979070A - Motor system for lifting ocean platform and load unbalance monitoring and controlling method of motor system - Google Patents

Abstract

The monitoring and control method of the motor system for lifting and lowering the offshore platform and its load imbalance. The system is equipped with inlet and outlet pressure relays at the oil inlet and outlet of each motor to monitor the pressure of the motor inlet and outlet in real time. And compare it with the set pressure, if it is higher than the set pressure, the relay will send a signal to the PLC control system, and then the PLC control system will judge whether the motor is in a state of unbalanced load according to the duration of the signal. In the unbalanced state, the PLC control system will alarm and stop, so as to realize the real-time monitoring and control of the unbalanced motor load, thereby enhancing the safety and reliability of the operation of the offshore platform lifting system. This design not only has good safety and reliability, but also has strong controllability.

Description

Offshore platform lifting motor system and its load unbalanced monitoring and control method

technical field

The invention relates to a hydraulic motor system for lifting and lowering an ocean platform, in particular to a motor system for lifting and lowering an ocean platform and a monitoring and control method for load imbalance thereof, which is particularly suitable for enhancing the safety and reliability of the motor system. This technology is a patented technology of the project funded by the National High-tech Research and Development Program (863 Program).

Background technique

At present, the lifting of the offshore platform depends on the operation of the hydraulic motor, that is, the hydraulic motor drives the gear to move along the fixed rack set on the leg, so as to realize the lifting of the offshore platform. During the lifting process of the platform, the hydraulic motors need to be synchronized, and all the motors involved in the drive are required to share the load of the platform system evenly. When the motor load is unbalanced, that is, when the loads of the motors are inconsistent, the motor with a large load is easily damaged, and in severe cases, it may even cause damage to the lifting system. Therefore, it is very important to monitor and control the load of each motor!

The Chinese patent authorization announcement number is CN201704683U, and the utility model patent whose authorization announcement date is January 12, 2011 discloses a locking mechanism for lifting and lowering an offshore platform. The mechanism includes a drilling platform and a pile leg. It has a lifting rack, and a thrust cylinder and a support cylinder are fixed on the drilling platform. The front end of the thrust cylinder is connected with a locking rack, and the locking rack corresponds to the lifting rack. Although the utility model has the advantages of simple structure, small size, light weight, and small footprint, it still has the following defects:

First of all, this utility model does not set up relevant monitoring facilities for the hydraulic motor. When using it, it is impossible to detect the unbalanced state of the motor load in time, and it is also impossible to solve the unbalanced state of the motor load. It is easy to damage the hydraulic motor and cause damage to the lifting system. Poor safety and reliability;

Secondly, the utility model does not have relevant control facilities for the hydraulic motor. When in use, not only cannot the hydraulic motor be accurately controlled, but also, once the motor is found to be in a dangerous state, such as when the load is unbalanced, the motor cannot be turned off in time. Control is weak.

Contents of the invention

The purpose of the present invention is to overcome the defects and problems of poor safety and reliability and weak controllability in the prior art, and provide a motor system for lifting and lowering offshore platforms with better safety, reliability and stronger controllability. Its load imbalance monitoring and control method.

To achieve the above object, the technical solution of the present invention is: the motor system for lifting the offshore platform includes a plurality of hydraulic motor units, each hydraulic motor unit includes a motor, a brake and a gear box, and the motor includes a motor oil inlet, The motor oil outlet, the motor oil return port and the motor output end, the motor output end is connected to one end of the gearbox through the brake, and the other end of the gearbox is connected to the pile legs set on the offshore platform; the motor oil inlet The oil inlet port is connected to the oil inlet pump station through the oil inlet passage, the motor oil outlet is connected to the oil outlet pump station through the oil outlet passage, and the motor oil return port is connected to the fuel tank;

The hydraulic motor unit also includes an oil inlet pressure relay, an oil outlet pressure relay, a No. 1 balance valve, a No. 2 balance valve, a shuttle valve and a solenoid valve;

The oil inlet of the motor is connected to the oil inlet pump station after passing through the oil inlet of the No. 1 balance valve and the oil outlet of the No. 1 balance valve in sequence, and the oil inlet between the motor oil inlet and the No. 1 balance valve oil inlet An oil inlet pressure relay is set on the oil circuit; the oil outlet of the motor passes through the oil inlet of the No. 2 balance valve and the oil outlet of the No. An oil outlet pressure relay is set on the oil outlet between the oil inlets of the balance valve; the No. 1 pilot control port on the No. 1 balance valve communicates with the No. 2 balance valve oil outlet, and the No. 2 balance valve on the No. 2 balance valve No. 1 pilot control port communicates with No. 1 balance valve oil outlet;

The oil inlet of the No. 1 shuttle valve on the shuttle valve is connected with the oil outlet of the No. 1 balance valve, the oil inlet of the No. 2 shuttle valve is connected with the oil outlet of the No. 2 balance valve, and the oil outlet of the shuttle valve is connected with the oil inlet of the solenoid valve. The oil outlet of the solenoid valve is connected with the brake, and the oil return port of the solenoid valve is connected with the oil tank;

The pressure relay at the oil inlet, the pressure relay at the oil outlet, and the solenoid valve are all connected to the PLC control system for signals.

The hydraulic motor unit also includes No. 1 safety valve and No. 2 safety valve. No. 1 safety valve and No. 2 safety valve are both arranged between the motor oil inlet and the motor oil outlet, and No. 1 safety valve and No. The hydraulic oil flow of the valve is reversed.

The oil return port of the motor is connected to the fuel tank through a hose, the oil return port of the solenoid valve is connected to the fuel tank through a hose, the oil outlet of the No. 1 balance valve is connected with the oil inlet pump station through a hose, and the oil outlet of the No. 2 balance valve It is connected to the oil pumping station through a hose.

The above-mentioned method for monitoring and controlling the unbalanced load of the motor system for lifting the offshore platform, the method for monitoring and controlling includes the following steps in sequence:

Step 1: Install the oil inlet pressure relay and the oil outlet pressure relay on the motor oil inlet and motor oil outlet of each motor. Among them, the oil inlet pressure relay is responsible for monitoring the pressure of the motor oil inlet, and the outlet The oil port pressure relay is responsible for monitoring the pressure of the oil outlet of the motor, and then set the set pressure in the oil inlet pressure relay and the oil outlet pressure relay, and the system can be operated after the setting is completed;

Step 2: During the operation of the system, the oil inlet pressure relay and the oil outlet pressure relay will compare the measured actual pressure with the set pressure. When the actual pressure is greater than the set pressure, the oil inlet pressure relay will , The oil outlet pressure relay sends a signal to the PLC control system, and the PLC control system starts timing after receiving the signal;

Step 3: When the above-mentioned timing time is greater than or equal to 3 seconds, the PLC control system judges that the system is in an unbalanced load state, alarms and shuts down, and at this time, the monitoring and control method ends.

In the third step: the shutdown means that the PLC control system cuts off the control power supply of the solenoid valve to stop the hydraulic system from supplying oil to the motor so that the motor stops running.

Compared with prior art, the beneficial effect of the present invention is:

1. The motor system in the motor system for lifting and lowering the offshore platform and the monitoring and control method for load unbalance thereof of the present invention includes a plurality of hydraulic motor units, each hydraulic motor unit includes a hydraulic motor, and the inlet and outlet of each hydraulic motor The oil ports are respectively equipped with inlet and outlet pressure relays to monitor the pressure of the motor inlet and outlet in real time, and compare it with the set pressure, and then judge whether the motor is in a state of unbalanced load according to the comparison result. If it is unbalanced, it will alarm and stop, thus realizing the real-time monitoring of motor load unbalance and improving the safety of motor system operation. Therefore, the safety reliability of the present invention is strong.

2. In the motor system for lifting and lowering the offshore platform and the monitoring and control method for unbalanced load thereof in the present invention, supporting control devices are also provided around the hydraulic motor, including No. 1 balance valve, No. 2 balance valve, shuttle valve and solenoid valve, When in use, control the positive and negative rotation of the hydraulic motor through the No. 1 balance valve and No. 2 balance valve to drive the legs to realize the lifting operation of the platform; use the shuttle valve and solenoid valve to close or run the motor to control the motor in real time; not only for The motor realizes precise control, and it is convenient to protect the motor when the motor is in a dangerous state, so as to improve the safety and reliability of the motor operation. Therefore, the present invention not only has strong controllability, but also has good safety and reliability.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure: brake 1, gearbox 2, motor 3, motor oil inlet 31, motor oil outlet 32, motor oil return port 33, motor output 34, oil inlet pressure relay 4, oil outlet pressure relay 5, No. 1 balance valve 6, No. 1 balance valve oil inlet 61, No. 1 balance valve oil outlet 62, No. 1 pilot control port 63, No. 2 balance valve 7, No. 2 balance valve oil inlet 71, No. 2 balance valve Oil outlet 72, No. 2 pilot control port 73, shuttle valve 8, No. 1 shuttle valve oil inlet 81, No. 2 shuttle valve oil inlet 82, shuttle valve oil outlet 83, solenoid valve 9, solenoid valve oil inlet 91. Solenoid valve oil outlet 92, solenoid valve oil return port 93, No. 1 safety valve 10, No. 2 safety valve 11, oil inlet passage 12, oil inlet pump station 13, oil outlet passage 14, oil outlet pump station 15, Fuel tank 16, flexible pipe 17.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1, the motor system for lifting the offshore platform includes a plurality of hydraulic motor units, each hydraulic motor unit includes a motor 3, a brake 1 and a gearbox 2, and the motor 3 includes a motor oil inlet 31 and a motor oil outlet 32. The motor oil return port 33 and the motor output port 34, the motor output port 34 is connected to one end of the gearbox 2 through the brake 1, and the other end of the gearbox 2 is connected to the leg set on the offshore platform; The motor oil inlet 31 is connected to the oil inlet pump station 13 through the oil inlet oil passage 12, the motor oil outlet 32 is connected to the oil outlet pump station 15 through the oil outlet oil passage 14, and the motor oil return port 33 is connected to the fuel tank 16;

The hydraulic motor unit also includes an oil inlet pressure relay 4, an oil outlet pressure relay 5, a No. 1 balance valve 6, a No. 2 balance valve 7, a shuttle valve 8 and a solenoid valve 9;

The motor oil inlet 31 is connected to the oil inlet pumping station 13 after passing through the oil inlet 61 of the No. 1 balance valve and the oil outlet 62 of the No. 1 balance valve in turn. The oil inlet oil passage 12 between 61 is provided with an oil inlet pressure relay 4; the motor oil outlet 32 passes through the No. 15, and an oil outlet pressure relay 5 is set on the oil outlet circuit 14 between the motor oil outlet 32 and the oil inlet 71 of the second balance valve; the No. 1 pilot on the No. 1 balance valve 6 The control port 63 communicates with the No. 2 balance valve oil outlet 72, and the No. 2 pilot control port 73 on the No. 2 balance valve 7 communicates with the No. 1 balance valve oil outlet 62;

The No. 1 shuttle valve oil inlet 81 on the shuttle valve 8 communicates with the No. 1 balance valve oil outlet 62, the No. 2 shuttle valve oil inlet 82 communicates with the No. 2 balance valve oil outlet 72, and the shuttle valve oil outlet 83 communicates with the solenoid valve oil inlet 91, the solenoid valve oil outlet 92 is connected with the brake 1, and the solenoid valve oil return port 93 communicates with the oil tank 16;

The oil inlet pressure relay 4, the oil outlet pressure relay 5, and the solenoid valve 9 are all connected to the PLC control system for signals.

The hydraulic motor unit also includes No. 1 safety valve 10 and No. 2 safety valve 11. No. 1 safety valve 10 and No. 2 safety valve 11 are all arranged between the motor oil inlet 31 and the motor oil outlet 32, and No. 1 The flow direction of the hydraulic oil of safety valve 10 and No. 2 safety valve 11 is opposite.

The motor oil return port 33 is connected to the oil tank 16 through the hose 17, the solenoid valve oil return port 93 is connected to the oil tank 16 through the hose 17, and the No. 1 balance valve oil outlet 62 is connected to the oil inlet pump station 13 through the hose 17. The oil outlet 72 of the No. 2 balance valve is connected with the oil outlet pumping station 15 through the hose 17.

The above-mentioned method for monitoring and controlling the unbalanced load of the motor system for lifting the offshore platform, the method for monitoring and controlling includes the following steps in sequence:

Step 1: Install the oil inlet pressure relay 4 and the oil outlet pressure relay 5 on the motor oil inlet 31 and the motor oil outlet 32 of each motor 3, wherein the oil inlet pressure relay 4 is responsible for monitoring the motor The pressure at the oil inlet 31 and the oil outlet pressure relay 5 are responsible for monitoring the pressure at the oil outlet 32 of the motor, and then set the set pressure in the oil inlet pressure relay 4 and the oil outlet pressure relay 5. After the setting is completed, it can run this system;

Step 2: During the operation of the system, the oil inlet pressure switch 4 and the oil outlet pressure switch 5 compare the measured actual pressure with the set pressure. When the actual pressure is greater than the set pressure, the oil inlet The pressure relay 4 and the oil outlet pressure relay 5 send a signal to the PLC control system, and the PLC control system starts timing after receiving the signal;

Step 3: When the above-mentioned timing time is greater than or equal to 3 seconds, the PLC control system judges that the system is in an unbalanced load state, alarms and shuts down, and at this time, the monitoring and control method ends.

In the third step: the shutdown means that the PLC control system cuts off the control power supply of the solenoid valve 9 to stop the hydraulic system from supplying oil to the motor 3 so that the motor 3 stops running.

Principle of the present invention is described as follows:

The purpose of the invention is to solve the problem that the hydraulic motor is damaged due to unbalanced load during the lifting process of the hydraulic lifting device of the offshore platform. The hydraulic motor unit in the present invention is equipped with pressure relays at the oil inlets and outlets of each motor, and the pressure relays are used to detect the pressures of the oil inlets and outlets of all motors participating in the work. Under normal working conditions, the pressure of the oil inlet and outlet of each motor is the same. If there is an unbalanced load, the working pressure of the motor with a large load will be higher than that of a motor with a small load, and it will also be higher than the setting of the pressure switch. At this time, the pressure relay will send a signal to the PLC control system, and the PLC control system will start timing after receiving the signal. When the signal time is greater than or equal to 3 seconds, the PLC control system will determine that the motor is in an unbalanced load state , it will alarm and cut off the control power supply of the solenoid valve to shut down the hydraulic motor.

Example 1:

The motor system for lifting the offshore platform includes multiple hydraulic motor units, and each hydraulic motor unit includes a motor 3, a brake 1, a gearbox 2, an oil inlet pressure relay 4, an oil outlet pressure relay 5, and a No. 1 balance valve 6 , No. 2 balance valve 7, shuttle valve 8, solenoid valve 9, No. 1 safety valve 10 and No. 2 safety valve 11;

The motor 3 includes a motor oil inlet 31, a motor oil outlet 32, a motor oil return port 33 and a motor output 34; the motor output 34 is connected to one end of the gear box 2 through the brake 1, and the gear box 2 The other end is connected with the pile legs set on the offshore platform; the motor oil inlet 31 is connected to the oil inlet pump station 13 after passing through the No. 1 balance valve oil inlet 61, the No. 1 balance valve oil outlet 62, and the hose 17. connected, and an oil inlet pressure relay 4 is provided on the oil inlet passage 12 between the motor oil inlet 31 and the No. 1 balance valve oil inlet 61; Oil port 71, No. 2 balance valve oil outlet 72, and hose 17 are connected to the oil outlet pump station 15, and are on the oil outlet passage 14 between the motor oil outlet 32 and the No. 2 balance valve oil inlet 71 An oil outlet pressure switch 5 is provided; the motor oil return port 33 is connected to the oil tank 16 through a hose 17;

The No. 1 pilot control port 63 on the No. 1 balance valve 6 communicates with the No. 2 balance valve oil outlet 72, and the No. 2 pilot control port 73 on the No. 2 balance valve 7 communicates with the No. 1 balance valve oil outlet 62; The No. 1 shuttle valve oil inlet 81 on the shuttle valve 8 communicates with the No. 1 balance valve oil outlet 62, the No. 2 shuttle valve oil inlet 82 communicates with the No. 2 balance valve oil outlet 72, and the shuttle valve oil outlet 83 communicates with the solenoid valve oil inlet 91, the solenoid valve oil outlet 92 is connected with the brake 1, and the solenoid valve oil return port 93 communicates with the oil tank 16 through the hose 17; the No. 1 safety valve 10 and No. 2 safety valve 11 They are all arranged between the motor oil inlet 31 and the motor oil outlet 32, and the hydraulic oil flow direction of No. 1 safety valve 10 and No. 2 safety valve 11 is opposite;

The oil inlet pressure relay 4, the oil outlet pressure relay 5, and the solenoid valve 9 are all connected to the PLC control system for signals.

The above-mentioned method for monitoring and controlling the unbalanced load of the motor system for lifting the offshore platform, the method for monitoring and controlling includes the following steps in sequence:

Step 1: Install the oil inlet pressure relay 4 and the oil outlet pressure relay 5 on the motor oil inlet 31 and the motor oil outlet 32 of each motor 3, wherein the oil inlet pressure relay 4 is responsible for monitoring the motor The pressure at the oil inlet 31 and the oil outlet pressure relay 5 are responsible for monitoring the pressure at the oil outlet 32 of the motor, and then set the set pressure in the oil inlet pressure relay 4 and the oil outlet pressure relay 5. After the setting is completed, it can run this system;

Step 2: During the operation of the system, the oil inlet pressure switch 4 and the oil outlet pressure switch 5 compare the measured actual pressure with the set pressure. When the actual pressure is greater than the set pressure, the oil inlet The pressure relay 4 and the oil outlet pressure relay 5 send a signal to the PLC control system, and the PLC control system starts timing after receiving the signal;

Step 3: When the time of the above timing is greater than or equal to 3 seconds, the PLC control system judges that the system is in an unbalanced load state, alarms and shuts down. The shutdown means that the PLC control system cuts off the control power supply of the solenoid valve 9 to stop the hydraulic pressure. The system supplies oil to the motor 3 so that the motor 3 stops running, at this time, the monitoring control method ends.

It can be seen from the above that the present invention realizes the real-time monitoring of the unbalanced state of the motor load by setting the inlet and outlet pressure relays of each hydraulic motor respectively, and can realize the real-time monitoring of the unbalanced state of the motor load, and can realize the real-time monitoring of the unbalanced state of the motor load, and can Effective control during the state greatly improves the safety and reliability of the operation of the hydraulic lifting system of the offshore platform, which plays a major role in my country's marine industry. the

Claims (5)

1. lifting of ocean platform motor system, comprise a plurality of hydraulic motors unit, each hydraulic motor unit comprises motor (3), brake (1) and gear-box (2), described motor (3) comprises motor oil-in (31), motor oil-out (32), motor oil return opening (33) and motor output end (34), described motor output end (34) is connected by the end of brake (1) with gear-box (2), and the spud leg that arranges on the other end of gear-box (2) and the ocean platform is connected; Described motor oil-in (31) is connected with oil-feed pumping plant (13) by oil-feed oil circuit (12), motor oil-out (32) by fuel-displaced oil circuit (14) with go out oil pump station (15) and be connected, motor oil return opening (33) is connected with fuel tank (16), it is characterized in that:

Described hydraulic motor unit also comprises inlet pressure relay (4), oil-out pressure switch (5), an equalizing valve (6), No. two equalizing valves (7), shuttle valve (8) and electromagnetic valve (9);

Described motor oil-in (31) is connected with oil-feed pumping plant (13) behind an equalizing valve oil-in (61), an equalizing valve oil-out (62) successively, and the oil-feed oil circuit (12) between motor oil-in (31), an equalizing valve oil-in (61) is provided with inlet pressure relay (4); Described motor oil-out (32) successively behind No. two equalizing valve oil-ins (71), No. two equalizing valve oil-outs (72) with go out oil pump station (15) and be connected, and the fuel-displaced oil circuit (14) between motor oil-out (32), No. two equalizing valve oil-ins (71) is provided with oil-out pressure switch (5); Pilot control opening (63) on the described equalizing valve (6) communicates with No. two equalizing valve oil-outs (72), and No. two pilot control opening (73) on No. two equalizing valves (7) communicate with an equalizing valve oil-out (62);

Shuttle valve oil-in (81) on the described shuttle valve (8) communicates with an equalizing valve oil-out (62), No. two shuttle valve oil-ins (82) communicate with No. two equalizing valve oil-outs (72), shuttle valve oil-out (83) communicates with electromagnetic valve oil-in (91), electromagnetic valve oil-out (92) is connected with brake (1), and electromagnetic valve oil return mouth (93) communicates with fuel tank (16);

Described inlet pressure relay (4), oil-out pressure switch (5), electromagnetic valve (9) all are connected with PLC control system signal.

2. lifting of ocean platform motor system according to claim 1, it is characterized in that: described hydraulic motor unit also comprises a safety valve (10) and No. two safety valves (11), a safety valve (10), No. two safety valves (11) all are arranged between motor oil-in (31), the motor oil-out (32), and the hydraulic oil of a safety valve (10), No. two safety valves (11) flows to opposite.

3. lifting of ocean platform motor system according to claim 1 and 2, it is characterized in that: described motor oil return opening (33) is connected with fuel tank (16) by flexible pipe (17), electromagnetic valve oil return mouth (93) communicates with fuel tank (16) by flexible pipe (17), an equalizing valve oil-out (62) is connected with oil-feed pumping plant (13) by flexible pipe (17), No. two equalizing valve oil-outs (72) by flexible pipe (17) with go out oil pump station (15) and be connected.

4. claim 1 or 2 described lifting of ocean platforms is characterized in that described monitoring and control method may further comprise the steps successively with the load unbalanced monitoring and control method of motor systems:

The first step: the upper correspondence of motor oil-in (31), motor oil-out (32) at each motor (3) is installed into hydraulic fluid port pressure switch (4), oil-out pressure switch (5) first, wherein, inlet pressure relay (4) is responsible for the pressure of monitoring motor oil-in (31), oil-out pressure switch (5) is responsible for the pressure of monitoring motor oil-out (32), in (5) setting pressure is set at inlet pressure relay (4), oil-out pressure switch again, just can moves native system after end is set;

Second step: in the running of native system, inlet pressure relay (4), oil-out pressure switch (5) compare actual pressure and its setting pressure that records, when actual pressure during greater than setting pressure, inlet pressure relay (4), oil-out pressure switch (5) just send signal to the PLC control system, and the PLC control system begins timing after receiving this signal;

The 3rd step: when time of above-mentioned timing during more than or equal to 3 seconds, the PLC control system judges that native system is in load unbalanced duty, reports to the police and also shuts down, and at this moment, described monitoring and control method finishes.

5. lifting of ocean platform according to claim 4 is characterized in that with the load unbalanced monitoring and control method of motor system:

In described the 3rd step: described shutdown refer to control power supply that the PLC control system cuts off electromagnetic valve (9) with the stop solution pressing system to motor (3) thus fuel feeding makes motor that (3) are out of service.

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