Marine main engine shafting bearing load flexible detection method

Abstract

The invention discloses a ship main engine shafting bearing load flexible detection method. The ship main engine shafting bearing load flexible detection method comprises the step of detecting the ship main engine shafting bearing load by using a ship main engine shafting bearing load flexible detection device. The detection method comprises the steps that the motor is started, the hydraulic oil pump is driven to provide hydraulic oil, the hydraulic oil enters the hydraulic steering gear, and when the hydraulic steering gear is not rotated, the hydraulic oil flows back to an oil tank through a port P and a port T of the hydraulic steering gear; when the hydraulic steering gear is rotated leftwards, hydraulic oil enters a rod cavity of the double-acting jack through a port A, and the double-acting jack retracts; when the hydraulic steering gear is rotated rightwards, hydraulic oil enters a rodless cavity of the double-acting jack through a port B, and the double-acting jack is ejected out to abut against the tail shaft. The problems that an existing marine main engine shafting bearing load checking device is complex in structure and high in cost, only a single measurement result can be obtained, and the using effect is poor can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of ship hydraulic steering gear and accessory manufacturing, in particular to a method for flexibly detecting the load of a ship main engine shaft system bearing. Background Art

[0002] For all ships powered by diesel engines, the load (support force) borne by the main engine and shaft system bearings must be adjusted to the range required by the process during the installation of the main engine and shaft system to determine the position of the ship's main engine shaft system. This is a key project that is carried out first in the outfitting operation after the ship is launched.

[0003] The ship shaft system is connected in series by multiple shafts such as the intermediate shaft and the tail shaft. The entire shaft is supported by the bearing. The force borne by the bearing is lifted by the jack to lift the shaft next to the bearing. The force received by the jack is the force borne by the bearing here. From this, it is known whether the force borne by the bearing here is within the allowable range. The traditional ship main engine shaft system adjustment process mainly adopts the manual lifting method. The equipment used is composed of a double-acting tensioning jack, a manual oil pump, a hydraulic cylinder, a dial indicator and a pressure gauge. Each time the load of the main engine shaft system related bearing is measured, the manual oil pump is operated, the readings of the dial indicator and the pressure gauge are read manually, and points are drawn on the graph paper to form a "pressure-displacement" curve. The load borne by the bearing is calculated by drawing lines according to the MAN rules. Based on the deviation between the current measured value of the bearing load and the design value, combined with the operation experience, the on-site operator predicts the adjustment amount of each bearing in the next step, that is, the displacement value of the main engine shaft system bearing to be lifted or lowered, and makes adjustments. In actual operation, the result adjusted by the operator's experience is not necessarily close to the design value. In fact, it is divergent, and it needs to be repeatedly operated and confirmed many times. This method of manual work and empirical judgment has a long operation cycle, high labor intensity, and low operation efficiency. At the same time, differences in visual readings by operators may lead to large errors in the measurement results.

[0004] CN202433130U discloses a ship bearing load measuring device, which uses a manual oil pump to manually pressurize and release the pressure to lift and lower the ship shaft, reads measurement data through a displacement sensor and a pressure sensor, and performs a single bearing load measurement, which can only obtain a single shaft system bearing measurement result.

[0005] The patent with application number 201811333556.7 discloses an automatic adjustment and measurement device for the bearing load of the main engine shaft system of a ship, including multiple displacement sensors arranged above the measured bearing for measuring the up and down movement of the ship shaft, and multiple hydraulic jacks for lifting the ship shaft, and electromagnetic valves and pressure sensors are arranged from the hydraulic power unit to the hydraulic oil outlet of each jack to be moved, and the multiple displacement sensors and pressure sensors are connected to a working computer equipped with a computer agile control system through a PLC control box, and the oil pump is controlled on the computer interface to adjust the pressure and flow, and the hydraulic jack is driven to lift and lower the ship shaft, and the displacement and corresponding pressure of the ship shaft are automatically recorded on the computer interface, and input into a special table to obtain the load value of the bearing. The present invention outputs an adjustment signal to the PLC control system through a set of independently developed computer agile control systems, automatically performs ship shaft lifting measurement and ship main engine height adjustment, and gradually approaches the target value, but its structure is complex, the manufacturing cost is high, and the detection process is complicated.

[0006] CN109540517A discloses an automatic adjustment and measurement device for the load of the main engine shaft system bearing of a ship, comprising a plurality of displacement sensors arranged above the measured bearing for measuring the up and down movement of the ship shaft, and a plurality of hydraulic jacks for lifting the ship shaft, and a solenoid valve and a pressure sensor are arranged from the hydraulic power unit to the hydraulic oil outlet of each jack to be moved, and the plurality of displacement sensors and pressure sensors are connected to a working computer equipped with a computer agile control system through a PLC control box, and the oil pump is controlled on the computer interface to adjust the pressure and flow, and the hydraulic jack is driven to lift and lower the ship shaft, and the displacement and corresponding pressure of the ship shaft are automatically recorded on the computer interface, and input into a special table to obtain the load value of the bearing. The solution has a complex structure, complex manufacturing, and higher cost, which is not affordable for small and medium-sized enterprises.

[0007] Therefore, it is necessary to design a ship main engine shaft bearing load inspection device with a simple structure, low manufacturing cost, concise detection process, easy use and capable of reflecting multiple inspection results, so as to be suitable for use by many enterprises, especially small and medium-sized enterprises. Summary of the invention

[0008] The problem to be solved by the present invention is to provide a method for detecting the flexibility of the ship main engine shaft bearing load, so as to solve the problem that the existing ship main engine shaft bearing load inspection device has a complex structure and high cost, can only obtain a single measurement result, and has a poor use effect.

[0009] In order to solve the above problems, the technical solution of the present invention is: the ship main engine shaft system bearing load flexibility detection method comprises using a ship main engine shaft system bearing load flexibility detection device to detect the ship main engine shaft system bearing load; The ship main engine shaft system bearing load flexibility detection device comprises a hydraulic oil pump connected to an oil tank, a pressure gauge and a double-acting jack, the hydraulic oil pump is connected to an electric motor, the oil outlet of the hydraulic oil pump is connected to a one-way valve and then connected to a P port of a hydraulic steering gear, the oil pipe of the T port of the hydraulic steering gear is divided into two branches, one is connected to the oil tank, and the other is connected to a high-pressure relief valve and then connected to a straight-through one-way valve, the A port and the B port of the hydraulic steering gear are respectively connected to the hydraulic control one-way valve and then connected to the rod chamber and the rodless chamber of the double-acting jack; The detection method includes: starting the electric motor, driving the hydraulic oil pump to provide hydraulic oil, the hydraulic oil enters the hydraulic steering gear, when the hydraulic steering gear is not rotated, the hydraulic oil flows back to the oil tank from the P port of the hydraulic steering gear through the T port; turning the hydraulic steering gear to the left, the hydraulic oil enters the rod cavity of the double-acting jack through the A port, and the double-acting jack retracts; turning the hydraulic steering gear to the right, the hydraulic oil enters the rodless cavity of the double-acting jack through the B port, and the double-acting jack is ejected.

[0010] In the above technical solution, a more specific solution may be: the oil pipe connected to the high-pressure relief valve is branched and connected to the pressure gauge before being connected to the straight-through one-way valve.

[0011] Further: the A port and the B port of the hydraulic steering gear are respectively connected to the hydraulically controlled one-way valve and then connected to the rod chamber and the rodless chamber of the double-acting jack through a high-pressure hose.

[0012] Furthermore: the pressure of the high-pressure relief valve is in the range of 0 to 16 MPa.

[0013] Furthermore: the pressure of the high-pressure relief valve is in the range of 0 to 16 MPa.

[0014] Further: an oil pipe connected to the oil tank through the T-port of the hydraulic steering gear is provided with an oil return filter before entering the oil tank.

[0015] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. The flexible detection method for the shaft bearing load of the main engine of the ship is to drive the hydraulic oil pump to rotate through the motor to provide hydraulic oil, rotate the hydraulic steering gear, the hydraulic oil enters the rodless cavity of the oil cylinder, and the piston rod extends to support the stern shaft; reverse the hydraulic steering gear, the hydraulic oil enters the rodless cavity, the piston rod contracts, and the top force is relaxed, and the shaft bearing load of the main engine of the ship can be detected by the double-acting jack; 2. The load flexibility detection method for the main engine shaft system bearing of the ship uses the hydraulic steering gear as a structure with a metering function. The speed of rotating the steering gear can effectively control the speed of lifting and retracting the oil cylinder; the hydraulically controlled one-way valve has an obvious pressure stabilizing effect in the system, and it serves as a double pressure stabilizing protection with the jack; when the system hydraulic pump cannot provide power, the hydraulic steering gear has the function of a manual pump, which can provide power for manual steering; The ship main engine shaft bearing load flexibility detection method is simple in structure, low in manufacturing cost, easy to use, and can obtain multiple inspection results. It has good detection effect and is suitable for use by many enterprises, especially small and medium-sized enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram of the oil circuit structure of a device for detecting the load flexibility of a shafting bearing of a main engine of a ship according to an embodiment of the present invention; The symbols include: oil tank 1, hydraulic oil pump 2, pressure gauge 3, one-way valve 4, hydraulic steering gear 5, high-pressure hose 6, double-acting jack 7, rod chamber A1, rodless chamber B1, hydraulically controlled one-way valve 8, straight-through one-way valve 9, high-pressure relief valve 10, electric motor 11, and return oil filter 12. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings: The present invention provides a ship main engine shaft system bearing load flexibility detection method, comprising using a ship main engine shaft system bearing load flexibility detection device to detect the ship main engine shaft system bearing load.

[0018] like Figure 1 The ship main engine shaft bearing load flexibility detection device shown includes a hydraulic oil pump 2 connected to an oil tank 1, a pressure gauge 3 and a double-acting jack 7, the hydraulic oil pump 2 is connected to an electric motor 11, the oil outlet of the hydraulic oil pump 2 is connected to a one-way valve 4 and then to a P port of a hydraulic steering gear 5, the oil pipe of the T port of the hydraulic steering gear 5 is divided into two branches, one is connected to the return oil filter 12 and then to the oil tank 1, the other is connected to the high-pressure relief valve 10 and then to the straight-through one-way valve 9, and the oil pipe connected to the high-pressure relief valve 10 is branched and connected to the pressure gauge 3 before being connected to the straight-through one-way valve 9.

[0019] The A port and the B port of the hydraulic steering gear 5 are respectively connected to the hydraulic control check valve 8 and then connected to the rod chamber A1 and the rodless chamber B1 of the double-acting jack 7 through the high-pressure hose 6. The pressure of the high-pressure relief valve is in the range of 0 to 16 MPa, which is used as a pressure regulator.

[0020] Detection methods include: The hydraulic oil tank 1 stores hydraulic oil, and the motor 11 is started to drive the hydraulic oil pump 2 to provide hydraulic oil. The hydraulic oil enters the hydraulic steering gear 5. When the hydraulic steering gear is not rotated, the hydraulic oil flows back to the oil tank from the P port of the hydraulic steering gear through the T port; when the hydraulic steering gear is turned left, the hydraulic oil enters the double-acting jack rod chamber, i.e., the A1 oil chamber, through the A port, and the double-acting jack retracts; when the hydraulic steering gear is turned right, the hydraulic oil enters the double-acting jack rodless chamber, i.e., the B1 oil chamber, through the B port, and the double-acting jack pushes out to support the stern shaft to measure the force borne by the bearing here; the pressure difference after connecting the two hydraulically controlled one-way valves 8 at the A port and the B port of the rotating hydraulic steering gear is the loading pressure or the unloading pressure, and the ship main engine shaft system bearing load can be detected through the double-acting jack, and the pressure of the high-pressure relief valve 10 can be arbitrarily adjusted within the range of 0 to 16Mpa.

[0021] The pressure gauge 3 in the system is used as a display of the system pressure. When the system has no power, the hydraulic steering gear 5 is turned, and the oil is sucked from the oil tank into the hydraulic steering gear 5 through the straight-through check valve 9. The check valve 4 is set to maintain the pressure and prevent the hydraulic oil from flowing back into the oil tank. Similarly, when the hydraulic oil pump 2 driven by the motor is used as the power, the straight-through check valve 9 also has the same function.

[0022] The hydraulic steering gear is a cycloid rotary valve type hydraulic steering gear composed of a follower valve and a pair of cycloid pinwheel meshing pairs. It acts as a reversing valve when there is power, and can realize manual steering when there is no power, which is the function of a manual pump. Its cycloid pinwheel meshing pair is the function of a quantitative motor. The amount of oil output by the steering gear is quantitative for each rotation of the steering gear. By using this function, the speed of pushing out and retracting the double-acting jack can be controlled by rotating the hydraulic steering gear. In conjunction with the hydraulic control check valve 8, the double-acting jack can be positioned at any position to measure the force of the shaft bearing.

[0023] The ship main engine shaft bearing load flexibility detection method is simple in structure, low in manufacturing cost, easy to use, and can obtain multiple inspection results. It has good detection effect and is suitable for use by many enterprises, especially small and medium-sized enterprises.

Claims

1. A method for detecting the load flexibility of a ship main engine shaft bearing, characterized in that: The method comprises using a ship main engine shaft system bearing load flexibility detection device to detect the ship main engine shaft system bearing load; The ship main engine shaft system bearing load flexibility detection device comprises a hydraulic oil pump connected to an oil tank, a pressure gauge and a double-acting jack, the hydraulic oil pump is connected to an electric motor, the oil outlet of the hydraulic oil pump is connected to a one-way valve and then connected to a P port of a hydraulic steering gear, the oil pipe of the T port of the hydraulic steering gear is divided into two branches, one is connected to the oil tank, and the other is connected to a high-pressure relief valve and then connected to a straight-through one-way valve, the A port and the B port of the hydraulic steering gear are respectively connected to the hydraulic control one-way valve and then connected to the rod chamber and the rodless chamber of the double-acting jack; The detection method includes: starting the electric motor, driving the hydraulic oil pump to provide hydraulic oil, the hydraulic oil enters the hydraulic steering gear, when the hydraulic steering gear is not rotated, the hydraulic oil flows back to the oil tank from the P port of the hydraulic steering gear through the T port; turning the hydraulic steering gear to the left, the hydraulic oil enters the rod cavity of the double-acting jack through the A port, and the double-acting jack retracts; turning the hydraulic steering gear to the right, the hydraulic oil enters the rodless cavity of the double-acting jack through the B port, and the double-acting jack is ejected.

2. The method for detecting load flexibility of a ship main engine shafting bearing according to claim 1 is characterized in that: The oil pipe connected to the high-pressure relief valve is further branched and connected to the pressure gauge before being connected to the straight-through one-way valve.

3. The method for detecting load flexibility of a ship main engine shafting bearing according to claim 1 or 2, characterized in that: The A port and the B port of the hydraulic steering gear are respectively connected to the hydraulically controlled one-way valve and then connected to the rod chamber and the rodless chamber of the double-acting jack through a high-pressure hose.

4. The method for detecting load flexibility of a ship main engine shafting bearing according to claim 1 or 2, characterized in that: The pressure of the high-pressure relief valve is in the range of 0 to 16 MPa.

5. The method for detecting load flexibility of a ship main engine shafting bearing according to claim 3 is characterized in that: The pressure of the high-pressure relief valve is in the range of 0 to 16 MPa.

6. The method for detecting load flexibility of a ship main engine shafting bearing according to claim 4 is characterized in that: An oil pipe connected to the oil tank through the T-port of the hydraulic steering gear is provided with an oil return filter before entering the oil tank.

7. The method for detecting load flexibility of a ship main engine shafting bearing according to claim 5 is characterized in that: An oil pipe connected to the oil tank through the T-port of the hydraulic steering gear is provided with an oil return filter before entering the oil tank.

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