Marine main engine shafting bearing load flexible detection device

Abstract

The utility model discloses a marine main engine shafting bearing load flexible detection device which comprises a hydraulic oil pump connected with an oil tank, a pressure gauge and a double-acting jack, the hydraulic oil pump is connected with a motor, and an oil outlet of the hydraulic oil pump is connected with a one-way valve and then connected to a P port of a hydraulic steering gear. An oil pipe of a port T of the hydraulic steering gear is divided into two branches, one branch is connected with the oil tank, the other branch is connected with a high-pressure overflow valve and then connected with a straight-through one-way valve, and a port A and a port B of the hydraulic steering gear are connected with a hydraulic control one-way valve and then connected with a rod cavity and a rodless cavity of the double-acting jack. Compared with the prior art, the marine main engine shafting bearing load detection device can solve the problems that an existing marine main engine shafting bearing load detection device is complex in structure and high in cost, only can obtain a single measurement result, and is poor in use effect.

Description

Technical Field

[0001] The utility model relates to the technical field of manufacturing of marine hydraulic steering gears and accessories, in particular to a flexible detection device for bearing load of a marine main engine shafting. Background Technique

[0002] For all ships powered by diesel engines, during the installation process of the main engine and the shafting, the load (support force) borne by the bearings of the main engine and the shafting must be adjusted to the range required by the process to determine the position of the marine main engine shafting, which is the key project that is carried out first after the ship is launched for outfitting work.

[0003] The marine shafting is composed of multiple shafts such as intermediate shafts and tail shafts connected in series. The entire shaft is supported by bearings. The force borne by the bearings is used to jack up the shaft beside the bearings through a jack. The force received by the jack, that is, the force borne by the bearings here, can be used to determine whether the force borne by the bearings here is within the allowable range. In the traditional adjustment process of the marine main engine shafting, the manual jacking method is mainly adopted. The equipment used consists of a double-acting tension jack, a manual oil pump, a hydraulic cylinder, a dial indicator, and a pressure gauge. Each time the bearing load of the main engine shafting is measured, the manual oil pump is operated, and the operator reads the readings of the dial indicator and the pressure gauge manually, plots points on graph paper to form a "pressure-displacement" curve, and calculates the load borne by the bearings according to the MAN rule. The on-site operators predict the adjustment amount of each bearing in the next step, that is, the displacement value of the lift or drop of the marine main engine shafting bearings, based on the deviation between the current measured value and the design value of the bearing load and combined with their operation experience, and then make adjustments. In actual operation, the result after adjustment by the operator's experience does not necessarily approach the design value. In fact, it diverges and requires repeated operations and multiple confirmations. This manual operation and experience-based judgment method has a long operation cycle, high labor intensity, low operation efficiency, and at the same time, large errors may occur in the measurement results due to the visual reading differences of the operators.

[0004] CN202433130U discloses a marine bearing load measuring device, which uses a manual oil pump to manually pressurize and depressurize to jack up and lower the marine shaft, reads the measurement data through a displacement sensor and a pressure sensor, and only obtains a single measurement result of the shafting bearings.

[0005] The patent with the application number 201811333556.7 discloses an automatic adjustment and measurement device for the bearing load of a ship's main engine shafting, which includes a plurality of displacement sensors arranged above the bearing to be measured for measuring the up and down movement of the ship's shaft, and a plurality of hydraulic jacks for jacking up the ship's shaft. Solenoid valves and pressure sensors are provided at the hydraulic oil outlets of the hydraulic power unit to each jack to be actuated. 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. The oil pump is operated and controlled on the computer interface to adjust the pressure and flow rate, drive the hydraulic jacks to jack up and lower the ship's shaft, automatically record the displacement of the ship's shaft and the corresponding pressure on the computer interface, input into a special table, and obtain the bearing load value. Through a set of independently developed computer agile control system, the present invention outputs adjustment signals to the PLC control system, automatically conducts the jacking measurement of the ship's shafting and the adjustment of the height of the ship's main engine, and gradually approaches the target value. However, its structure is complex, the manufacturing cost is high, and the detection process is cumbersome.

[0006] CN109540517A discloses an automatic adjustment and measurement device for the bearing load of a ship's main engine shafting, which includes a plurality of displacement sensors arranged above the bearing to be measured for measuring the up and down movement of the ship's shaft, and a plurality of hydraulic jacks for jacking up the ship's shaft. Solenoid valves and pressure sensors are provided at the hydraulic oil outlets of the hydraulic power unit to each jack to be actuated. 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. The oil pump is operated and controlled on the computer interface to adjust the pressure and flow rate, drive the hydraulic jacks to jack up and lower the ship's shaft, automatically record the displacement of the ship's shaft and the corresponding pressure on the computer interface, input into a special table, and obtain the bearing load value. This solution has a complex structure, complex operation, and higher cost, which cannot be borne by small and medium-sized enterprises.

[0007] Therefore, it is necessary to design a ship's main engine shafting bearing load inspection device with a simple structure, low manufacturing cost, simple detection process, convenient 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 utility model is to provide a flexible detection device for the bearing load of a ship's main engine shafting, so as to solve the problems that the existing inspection device for the bearing load of a ship's main engine shafting has a complex structure and high cost, and can only obtain a single measurement result, and the use effect is not good.

[0009] In order to solve the above problems, the technical solution of the utility model is: the ship main engine shaft bearing load flexibility detection device includes 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 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 rodless chamber of the double-acting jack.

[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 utility model has the following beneficial effects compared with the prior art:

[0016] 1. The ship main engine shaft bearing load flexibility detection device drives the hydraulic oil pump to rotate through the motor to provide hydraulic oil, rotate the hydraulic steering gear, the hydraulic oil enters the rodless chamber 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 chamber, the piston rod contracts, and the top force is relaxed, and the ship main engine shaft bearing load can be detected through the double-acting jack;

[0017] 2. The ship's main engine shaft bearing load flexibility detection device uses a hydraulic steering gear as a structure with a metering function. The speed of turning the steering gear can effectively control the speed of the oil cylinder's lifting and retraction. 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.

[0018] The ship main engine shaft bearing load flexibility detection device has a simple structure, low manufacturing cost, and is easy to use. It can obtain multiple inspection results and has a good detection effect. It is suitable for use by many enterprises, especially small and medium-sized enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the oil circuit structure diagram of the embodiment of the utility model;

[0020] 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

[0021] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0022] 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.

[0023] 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.

[0024] Detection methods include:

[0025] 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.

[0026] The pressure gauge 3 in the system is used to display the system pressure. When there is no power in the system, rotate the hydraulic steering gear 5, and the oil is sucked into the hydraulic steering gear 5 from the fuel tank through the direct-flow check valve 9. The check valve 4 is set for pressure holding and preventing the hydraulic oil from flowing back into the fuel tank. Similarly, when the hydraulic oil pump 2 driven by the motor is used as the power, the direct-flow check valve 9 also has the same function.

[0027] The hydraulic steering gear is a kind of cycloidal rotary valve type hydraulic steering gear composed of a follow-up valve and a pair of cycloidal pinwheel meshing pairs. When there is power, it acts as a reversing valve, and when there is no power, it can achieve manual steering, belonging to the function of a manual pump. Its cycloidal pinwheel meshing pair belongs to the function of a fixed-displacement motor. For each revolution of the steering gear, the output oil volume is fixed. Utilizing this function, by controlling the speed of rotation of the hydraulic steering gear, the speed of the double-acting jack extending and retracting can be controlled. Cooperating with the hydraulic control check valve 8, the force detection for the positioning of the double-acting jack at any position for the shafting bearing measurement can be realized.

[0028] The flexible detection device for the load of the main engine shafting bearings of this ship has a simple structure, low manufacturing cost, convenient use, and can obtain multiple inspection results, with good detection effects, and is suitable for use by many enterprises, especially small and medium-sized enterprises.

Claims

1. A flexible detection device for the bearing load of a ship's main engine shafting system, comprising a hydraulic oil pump connected to an oil tank, a pressure gauge and a double-acting jack, characterized in that: The hydraulic oil pump is connected to an electric motor. The oil outlet of the hydraulic oil pump is connected to a check valve and then connected to the P port of a hydraulic steering gear. The oil pipe of the T port of the hydraulic steering gear is branched into two branches. One branch is connected to the fuel tank, and the other branch is connected to a high-pressure overflow valve and then connected to a direct-flow check valve. The A port and the B port of the hydraulic steering gear are respectively connected to pilot-operated check valves and then connected to the rod chamber and the rodless chamber of the double-acting jack.

2. The flexible detection device for the bearing load of the marine main engine shafting according to claim 1, characterized in that: One oil pipe connecting the high-pressure overflow valve is branched and connected to the pressure gauge before connecting the direct-flow check valve.

3. The flexible detection device for the bearing load of the main engine shafting of a ship 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 pilot-operated check valves and then connected to the rod chamber and the rodless chamber of the double-acting jack through high-pressure hoses.

4. The flexible detection device for the bearing load of the main engine shafting of a ship according to claim 1 or 2, characterized in that: The pressure of the high-pressure overflow valve is in the range of 0 - 16 Mpa.

5. The flexible detection device for bearing load of a marine main engine shafting according to claim 3, characterized in that: The pressure of the high-pressure overflow valve is in the range of 0 - 16 Mpa.

6. The flexible detection device for the bearing load of the main engine shafting of a ship according to claim 4, characterized in that: One oil pipe connecting the T port of the hydraulic steering gear to the fuel tank is provided with an oil return filter before entering the fuel tank.

7. The flexible detection device for the bearing load of the main engine shafting of a ship according to claim 5, characterized in that: One oil pipe connecting the T port of the hydraulic steering gear to the fuel tank is provided with an oil return filter before entering the fuel tank.

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