A high-power mud pump gear box

Abstract

The utility model relates to ship power transmission technology production technical field, concretely relates to a high -power mud pump gear box, including the box and fixed in the inside input shaft system, output shaft system and hydraulic system of box, the input shaft system includes input shaft, input thrust disc and input bearing, the input shaft is gear shaft, its input end is connected with mud pump motor through the shaft coupling, and the output end is equipped with helical gear, the output shaft system includes output gear, output shaft and thrust bearing, the output gear is engaged with the helical gear of input shaft, and is connected with the output shaft through interference fit, the hydraulic system includes lubricating oil pump group, filter, cooler and monitoring instrument for lubricating and cooling the inside component gear box, the utility model discloses through optimizing the structural design of input shaft system and output shaft system and improving hydraulic system, can satisfy 30000 square rake suction dredger mud pump transmission device use, solved the volume big, low efficiency etc. of traditional multi -motor parallel car scheme.

Description

Technical Field

[0001] This utility model relates to the field of marine power transmission technology and production technology, specifically to a high-power mud pump gearbox. Background Technology

[0002] As a core transmission component of a ship's power system, the mud pump gearbox's primary function is to efficiently transmit power from the mud pump motor to the mud pump system and ensure stable operation of the mud pump through torque amplification and speed regulation. In dredging operations, the performance of the mud pump gearbox directly affects the overall operational efficiency and reliability of trailing suction hopper dredgers.

[0003] Currently, most mud pump gearboxes on the market suffer from a technical bottleneck due to limited power carrying capacity. Constrained by traditional designs, existing gearboxes struggle to match the power transmission requirements of a single high-power motor. To meet the transmission requirements of large trailing suction hopper dredgers for high-displacement mud pumps, the industry typically employs a parallel operation of multiple motors. While this parallel transmission mode achieves power aggregation, it also introduces problems such as increased system complexity, larger space requirements, and a greater number of motors. This not only increases equipment maintenance costs but also significantly raises the system failure rate due to the complexity of multi-power source coordinated control. Utility Model Content

[0004] To address the aforementioned technical problems in the existing technology, the purpose of this utility model is to provide a novel high-power mud pump gearbox that achieves direct drive of the mud pump system by a single high-power motor through an innovative transmission structure design.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-power mud pump gearbox includes a housing and an input shaft system, an output shaft system, and a hydraulic system fixed inside the housing.

[0007] The input shaft system includes an input shaft, an input thrust disk, and an input bearing. The input shaft is a gear shaft, with its input end connected to the mud pump motor via a coupling and its output end equipped with a helical gear.

[0008] The output shaft system includes an output gear, an output shaft, and a thrust bearing; the output gear meshes with a helical gear on the input shaft and is connected to the output shaft via an interference fit.

[0009] The hydraulic system includes a lubricating oil pump assembly, a filter, a cooler, and monitoring instruments, used for lubricating and cooling the internal components of the gearbox.

[0010] As a preferred technical solution, the input thrust disk is interference-fitted to the outside of the input shaft and cooperates with the input bearing to form an axial constraint pair.

[0011] As a preferred technical solution, the thrust bearing is interference-fitted to the outside of the output shaft.

[0012] As a preferred technical solution, the transmission speed ratio between the input shaft and the output gear is 1.5:1 to 12:1.

[0013] As a preferred technical solution, both the input bearing and the thrust bearing are sliding bearings.

[0014] As a preferred technical solution, the lubricating oil pump group of the hydraulic system includes a lubricating oil gear pump and a lubricating oil electric standby pump, which are connected in parallel to the filter inlet, and the filter outlet is connected to each lubrication point of the gearbox via a cooler.

[0015] As a preferred technical solution, the monitoring instrument includes a pressure gauge and a temperature gauge, which respectively detect the lubricating oil pressure and bearing temperature through sensors, and the sensor signals are transmitted to the outside through a junction box.

[0016] As a preferred technical solution, the temperature sensor is installed in the bearing housing mounting hole in the middle section of the input bearing and the thrust bearing, and the sensor probe is in contact with the bearing body.

[0017] As a preferred technical solution, the pressure sensor is installed in the lubricating oil pipeline.

[0018] As a preferred technical solution, the gearboxes are arranged symmetrically on both sides of the hull.

[0019] This utility model has the following advantages compared with the prior art:

[0020] 1) This utility model optimizes the structural design of the input and output shaft systems, adopts a high-strength 18CrNiMo7-6 alloy steel input shaft and high-precision helical gear meshing, and achieves efficient transmission of 9000kW power from a single motor with a transmission capacity of 9KW / rpm. This can meet the requirements of the mud pump transmission device of a 30,000 cubic meter trailing suction dredger and meet the torque transmission requirement of 370,000N.m for the mud pump. It transmits 9000KW of power from a single motor, solving the problems of large size and low efficiency of traditional multi-motor parallel operation schemes.

[0021] 2) An input thrust disc and thrust bearing are installed on the outside of the input shaft to effectively bear the axial force generated by the meshing of helical gears, prevent shaft movement, ensure transmission accuracy, reduce gear wear, and improve the long-term operational stability of the gearbox.

[0022] 3) The output gear and output shaft adopt a cylindrical interference fit with a safety factor of ≥5.0 to ensure the connection strength when transmitting large torques; the infinite life design of the sliding bearing further reduces maintenance costs and improves the service life of the equipment.

[0023] 4) The hydraulic system is equipped with dual-pump redundant lubrication (main pump + standby pump), a filter cooling device and real-time monitoring instruments (pressure and temperature sensors) to ensure that key components (such as bearings and gears) are always in the best lubrication condition, reduce the failure rate, and can be remotely monitored and warned through the junction box.

[0024] 5) Compared with the traditional multi-motor parallel operation scheme, this utility model adopts a single motor drive, which is more compact in structure and occupies less space. It is suitable for the cabin layout requirements of large dredging equipment such as 30,000 cubic meter trailing suction hopper dredgers, and is also convenient for maintenance and component replacement. Attached Figure Description

[0025] Figure 1 This is a sectional view of the interior of the housing in this utility model;

[0026] Figure 2 This is a front view of the high-power mud pump gearbox of this utility model;

[0027] Figure 3 for Figure 2 The left view;

[0028] Figure 4 for Figure 2 Rear view;

[0029] Figure 5 for Figure 2 The right view.

[0030] In the diagram: 1. Housing; 2. Input shaft system; 21. Input shaft; 22. Input thrust plate; 23. Input bearing; 3. Output shaft system; 31. Output gear; 32. Output shaft; 33. Thrust bearing; 4. Hydraulic system; 41. Lubricating oil gear pump; 42. Lubricating oil electric backup pump; 43. Lubricating oil filter; 44. Lubricating oil cooler; 45. Relief valve; 46. Instrument panel; 47. Junction box. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings.

[0032] Example 1

[0033] See Figures 1-5This embodiment discloses a high-power mud pump gearbox, with the gearboxes symmetrically arranged on both sides of the hull. Each gearbox includes a housing 1 and an input shaft system 2, an output shaft system 3, and a hydraulic system 4 fixed inside its respective housing. The input shaft system 2 includes an input shaft 21, an input thrust disc 22, and an input bearing 23. The output shaft system 3 includes an output gear 31, an output shaft 32, and a thrust bearing 33. The input shaft 21 is a gear shaft made of 18CrNiMo76 steel. The mud pump motor outside the housing is connected to the input shaft 21 via a high-elasticity coupling, transmitting power to the input shaft 21. The output end of the input shaft 21 is provided with a first-stage helical gear that meshes with the output gear 31. When the motor drives the input shaft 21 to rotate, the helical gear on the input shaft 21 drives the output gear 31 to rotate, thereby transmitting power from the input shaft 21 to the output gear 31. The output gear 31 is mounted on the output shaft 32 with an interference fit, so that the output shaft 32 can transmit power to the mud pump system to drive the mud pump.

[0034] Furthermore, the input shaft 21 is interference-fitted with an input thrust disc 22 and an input bearing 23, which serve the following functions: 1) In high-precision power transmission systems, such as mud pump gearboxes used in the mud pump transmission device of a 30,000 cubic meter trailing suction dredger, the axial movement of the input shaft needs to be strictly controlled; when the motor drives the input shaft through a high-elasticity coupling, the helical gear meshing will generate a significant axial force, and the input thrust disc can cooperate with the input bearing 23 to share the load and prevent shaft movement; 2) The input thrust disc 22 and the input bearing 23 form an axial constraint pair, fixing the axial position of the input shaft, ensuring stable gear meshing, and reducing vibration and wear; at the same time, it disperses stress and avoids fatigue at the shaft root.

[0035] Furthermore, the output gear 31 is connected to the output shaft 32 with a cylindrical interference fit, ensuring the reliability and stability of the connection. This design enables efficient transmission of high power, and through design optimization, the safety factor is ≥5.0, ensuring the safety and stability of the mud pump gearbox during operation. The thrust bearing 33 is interference-fitted to the outer side of the output shaft 32.

[0036] Furthermore, the speed ratio of the input and output transmission stages is designed to be from 1.5:1 to 12:1. This transmission ratio is achieved through reasonable gear ratio and size design, thereby meeting the speed and torque requirements of the mud pump.

[0037] Furthermore, the thrust bearing and the thrust pump utilize sliding bearings. The design of sliding bearings ensures smoother operation, reduces vibration and noise, and extends the service life of the equipment. Simultaneously, the unlimited life design of sliding bearings significantly reduces equipment maintenance costs and downtime, improving operating efficiency and economic benefits. In addition, the output shaft needs to withstand the impact loads generated during mud pump operation; therefore, the shaft's strength and rigidity are fully considered in the design to ensure it can reliably withstand these impacts.

[0038] The hydraulic system 4 is located on the outside of the housing 1 and includes a lubricating oil gear pump 41, a lubricating oil electric backup pump 42, a lubricating oil filter 43, a lubricating oil cooler 44, an overflow valve 45, an instrument panel 46, and a junction box 47. The lubricating oil gear pump 41 and the lubricating oil electric backup pump 42 are respectively connected in parallel to the inlet of the lubricating oil filter 43 through pipelines. The outlet of the lubricating oil filter 43 is connected to the inlet of the lubricating oil cooler 44. Thus, the lubricating oil gear pump 41 and the lubricating oil electric backup pump 42 draw out the lubricating oil from the gearbox, filter it through the lubricating oil filter 43, and then deliver it to the lubricating oil cooler 44. After cooling, the lubricating oil enters the various lubrication points of the gearbox through their respective pipelines, such as the input bearing, the thrust bearing, and each gear.

[0039] The instrument panel integrates a pressure gauge and a temperature gauge, which are connected to the junction box 47 via pipelines. A temperature sensor is installed in the middle section of the input bearing and the thrust bearing. The temperature sensor is installed in the bearing housing mounting hole in the middle section of the input bearing and the thrust bearing. The sensor probe contacts the bearing body to detect the bearing temperature. The temperature sensor is connected to the temperature gauge via a line.

[0040] The pressure sensor is installed on the lubricating oil pipeline; the pressure sensor is connected to the pressure gauge via a line; the junction box obtains the pressure and temperature information of the gearbox and transmits the signal to the outside world to realize automatic monitoring and alarm.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A high-power mud pump gearbox, characterized in that, Includes the housing and the input shaft system, output shaft system, and hydraulic system fixed inside the housing; The input shaft system includes an input shaft, an input thrust disk, and an input bearing. The input shaft is a gear shaft, with its input end connected to the mud pump motor via a coupling and its output end equipped with a helical gear. The output shaft system includes an output gear, an output shaft, and a thrust bearing; the output gear meshes with a helical gear on the input shaft and is connected to the output shaft via an interference fit. The hydraulic system includes a lubricating oil pump assembly, a filter, a cooler, and monitoring instruments, used for lubricating and cooling the internal components of the gearbox.

2. The high-power mud pump gearbox according to claim 1, characterized in that, The input thrust disk is interference-fitted to the outside of the input shaft and forms an axial constraint pair with the input bearing.

3. The high-power mud pump gearbox according to claim 1, characterized in that, The thrust bearing is interference-fitted to the outside of the output shaft.

4. The high-power mud pump gearbox according to claim 1, characterized in that, The transmission ratio between the input shaft and the output gear ranges from 1.5:1 to 12:

1.

5. The high-power mud pump gearbox according to claim 1, characterized in that, Both the input bearing and the thrust bearing are sliding bearings.

6. The high-power mud pump gearbox according to claim 1, characterized in that, The hydraulic system's lubricating oil pump assembly includes a lubricating oil gear pump and a lubricating oil electric backup pump, which are connected in parallel to the filter inlet. The filter outlet is connected to each lubrication point of the gearbox via a cooler.

7. The high-power mud pump gearbox according to claim 1, characterized in that, The monitoring instruments include a pressure gauge and a temperature gauge, which detect the lubricating oil pressure and bearing temperature respectively through sensors. The sensor signals are transmitted to the outside through the junction box.

8. The high-power mud pump gearbox according to claim 7, characterized in that, The temperature sensor is installed in the bearing housing mounting hole in the middle section of the input bearing and thrust bearing, and the sensor probe is in contact with the bearing body.

9. The high-power mud pump gearbox according to claim 7, characterized in that, The pressure sensor is located in the lubricating oil line.

10. The high-power mud pump gearbox according to claim 1, characterized in that, The gearboxes are arranged symmetrically on both sides of the hull.

Images