Multifunctional control box for the turning gear of marine low-speed diesel engines

Abstract

A multifunctional control box for a turning gear of a marine low-speed diesel engine. The turning gear includes a motor and a braking device, and the braking device includes a brake coil, a spring and a brake pad. It is characterized in that: a brake control module connected to the braking device is provided inside the multifunctional control box to control the motor of the turning gear, so as to realize the turning operation of the turning gear without a brake control module. At the same time, thermal relays with three gears are configured to cover the turning gears of marine low-speed diesel engines of various models, and realize the overload protection of the motor of the turning gear. The invention can control the start and stop of turning gears with different configurations of internal self-braking and non-braking control modules of the motor, complete the turning operation of the turning gear, and at the same time realize the overload protection of the motor. It has the advantages of diverse functions, strong versatility, safety and reliability, is applicable to the turning gears of various types of marine low-speed diesel engines, and can also be applied to large rotating parts involving the use of turning gears.

Description

Technical Field

[0001] The invention relates to diesel engine manufacturing process equipment, in particular to a multifunctional control box for a marine low-speed diesel engine turning machine, belonging to the field of marine low-speed diesel engines. Background Art

[0002] During the manufacturing process of marine low-speed diesel engines, each station has to produce multiple different types of diesel engines. Each diesel engine is equipped with a turning machine of different types and powers. The turning machine control box is used to control the start and stop of the turning machine, and also plays a protective function for the turning machine motor.

[0003] There are two types of turning machine motors. One is that the motor has a built-in brake control module. The control box only needs to provide a total power supply to the motor. The built-in brake control module can supply power to the motor brake device to realize the start and stop control of the turning machine. The other is that the motor does not have a brake control module. The control box needs to provide a brake power supply to the motor brake device to realize the start and stop control of the turning machine. The brake control module of the turning machine motor is essentially a controllable DC power supply, which is connected to the brake coil of the brake device in the motor. By turning the power supply to the brake coil on and off, the brake pad of the brake device is controlled to disengage and engage with the motor, thereby realizing the start and stop control of the turning machine. The operating principle is that the brake coil of the brake device of the turning machine motor requires a DC power supply. When the brake control module is powered, the brake coil is energized and actuated, the brake pad is disengaged, and the motor starts to rotate; when the brake control module is powered off, the brake coil loses power, the electromagnetic force disappears, the spring in the brake device applies force to make the brake pad engage, and the motor stops rotating.

[0004] A turning machine control box is fixedly installed on the workbench in the manufacturing plant, but the control box does not have a brake control module. However, the types of diesel engines manufactured on the workbench are not fixed. Therefore, when a diesel engine without a brake control module is manufactured in the turning machine motor, the turning machine control box fixed on the workbench cannot be used, and a control box must be connected separately to meet production needs.

[0005] The power of the cranking motor of different models of diesel engines is different, and the model requirements of the thermal relay that protects the motor are also different. In recent years, the increase in diesel engine models has resulted in the thermal relay in the original control box on the platform being unable to meet the protection requirements of the cranking motor of all models, especially unable to protect high-power motors, and frequent tripping will occur during use.

[0006] The connection points of the original control box cable input and output are inside the box, and professional personnel are required to disconnect the cables after the platform is hoisted.

[0007] The remote control handle is a wired remote control device at the far end of the barring gear control box. There is a stop button on the original remote control handle, which can cut off the control of the remote control part. However, during long-term use, it is found that the control part fails. Due to reasons such as contactor failure, it does not disengage, resulting in the power supply part not losing power, causing the barring gear to not be stopped in time and damaging the diesel engine parts.

[0008] In addition, the top of the original control box is flat. Operators often place sundries such as parts or water bottles on it. There has been a situation where the water bottle overturned and the water flowed into the control box, causing electrical component failures.

[0009] To sum up, the problems existing in the original barring gear control box are as follows:

[0010] 1. It is impossible to control the barring gear without a brake control module inside the motor.

[0011] 2. It cannot cover the control requirements of all models of barring gears.

[0012] 2. The work of disconnecting and reconnecting the wires of the control box during the hoisting process of the platform at the station is cumbersome.

[0013] 4. The stop button at the remote control end cannot ensure the cutting off of the power circuit, posing a safety hazard.

[0014] 5. The top of the control box is flat, and it is easy for sundries to accumulate, which may affect the performance of the control box. Summary of the Invention

[0015] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the original barring gear control box, and provide a multi-functional control box for the barring gear of marine low-speed diesel engines, which is more universal, full-coverage, more convenient, and has higher safety. A brake control device is arranged inside, the cable wiring uses aviation plugs, and the thermal relay is reasonably selected to meet the full coverage of the manufactured models. The remote control handle is increased with an emergency stop button to cut off the power circuit, and the top of the control box adopts an inclined top structure to avoid the accumulation of sundries.

[0016] The present invention adopts the following technical solutions to solve its technical problems:

[0017] A multi-functional control box for the barring gear of marine low-speed diesel engines, the barring gear includes a motor and a brake device, and the brake device includes a brake coil, a spring and a brake pad; characterized in that: a brake control module connected to the brake device is arranged inside the multi-functional control box to control the motor of the barring gear, realize the barring operation of the barring gear without a brake control module, and at the same time configure a thermal relay with three gears to cover the barring gears of various models of marine low-speed diesel engines and realize the overload protection of the motor of the barring gear.

[0018] Further, the multifunctional control box includes a box body, a transformer, a rectifier bridge, a switch, a forward starting relay, a reverse starting relay, a first thermal relay, a second thermal relay, a third thermal relay, a thermal relay gear selection switch, a first thermal relay control relay, a second thermal relay control relay, a third thermal relay control relay, a thermal relay protection relay, and an emergency cut-off relay;

[0019] The box body is provided with a control box power interface, a barring gear power interface, a first barring gear motor control interface, a second barring gear motor control interface, and a remote control handle interface;

[0020] The control box power interface is used for the power supply of the entire multifunctional control box, externally connecting to an industrial AC power supply and internally connecting to the primary side of the transformer;

[0021] The barring gear power interface is used to provide power to the barring gear, externally connecting to the motor of the barring gear and internally connecting to the control box power interface through the contacts of the first thermal relay, the second thermal relay, the third thermal relay, the forward starting relay, and the reverse starting relay;

[0022] The first barring gear motor control interface is used to control the motor of the barring gear with a built-in brake control module, externally connecting to the brake module of the motor of the barring gear with the built-in brake control module and internally connecting to the contacts of the forward starting relay and the reverse starting relay;

[0023] The second barring gear motor control interface is used to control the motor of the barring gear without a brake control module, externally connecting to the brake device of the motor of the barring gear without the brake control module and internally connecting to the secondary side of the transformer through the contacts of the forward starting relay, the reverse starting relay, the rectifier bridge, and the switch;

[0024] The remote control handle interface is used for the stop control of the motor, externally connecting to the remote control handle and internally connecting to the secondary side of the transformer. The two ends of the secondary side are connected to the contacts of the forward starting relay, the reverse starting relay, the first thermal relay control relay, the second thermal relay control relay, the third thermal relay control relay, the thermal relay protection relay, the emergency cut-off relay, the thermal relay gear selection switch, and the first thermal relay, the second thermal relay, and the third thermal relay;

[0025] When the switch is turned on, the rectifier bridge is powered on and outputs direct current. The forward starting relay or the reverse starting relay acts, the brake coil obtains the working power supply and acts, the brake pads are disengaged, the motor rotates, and at the same time the barring gear starts, thereby completing the barring operation of the barring gear without a brake control module;

[0026] The thermal relay gear selection switch selects and connects one of the first thermal relay control relay, the second thermal relay control relay, and the third thermal relay control relay. The contact of this relay closes, and the first thermal relay, the second thermal relay, or the third thermal relay that is connected to this relay and corresponds to the motor power and rated current of the barring gear operates. If the motor experiences thermal overload, the contacts of the corresponding first thermal relay, second thermal relay, or third thermal relay disconnect. The thermal relay protection relay connected to this contact loses power and its contacts disconnect, causing the entire control circuit to lose power, cutting off the power supply of the motor, and achieving thermal overload protection for the motor.

[0027] In case of an emergency, cut off the emergency stop button S20 of the remote control handle. The emergency cut-off relay loses power and its contacts disconnect, causing the entire control circuit to lose power, cutting off the power supply of the motor, and achieving emergency stop of the barring gear.

[0028] Further, the rectifier bridge is a full-wave rectifier bridge, which is used as a brake control module for controlling the brake device, converting the input 110V alternating current into the output 99V direct current.

[0029] Further, the first thermal relay is LRD340C, which is used to protect a motor with a rated current of 30 - 40A. The second thermal relay is LRD32C, which is used to protect a motor with a rated current of 18 - 32A. The third thermal relay is LRD16C, which is used to protect a motor with a rated current of 6 - 18A, thereby achieving overload protection for motors of various barring gears.

[0030] Further, the first thermal relay control relay, the second thermal relay control relay, and the third thermal relay control relay are interlocked by contacts, and the ahead starting relay and the astern starting relay are interlocked by contacts.

[0031] Further, the power supply interface of the control box, the power supply interface of the barring gear, the first barring gear motor control interface, the second barring gear motor control interface, and the remote control handle interface are aviation plugs.

[0032] Further, the top of the box body adopts an inclined structure.

[0033] The multifunctional control box for the marine low-speed diesel engine barring gear of the present invention solves the problems of the original control box being non-universal, not covering all models, inconvenient to use, and having low safety, and has the following beneficial technical effects:

[0034] 1. Configure a rectifier bridge as a brake control module to achieve the control of barring gear motors with different configurations.

[0035] 2. A thermal relay with three gears is configured to achieve overload protection for all models.

[0036] 3. The inlet and outlet cables of the control box are in the form of aviation plugs, facilitating the lifting operation of the table platform.

[0037] 4. An emergency stop button is set on the remote control handle, enhancing the safety of the multi-functional control box.

[0038] 5. The top of the control box body adopts an inclined top structure, avoiding the influence of accumulated debris on the internal electrical components of the control box.

[0039] The present invention is applicable to the control of turning gears for various types of marine low-speed diesel engines, and can also be widely applied to fields involving the use of turning gears, such as large rotating parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is the electrical schematic diagram of the present invention.

[0041] Figure 2 is the schematic diagram of the remote control handle.

[0042] In the figure:

[0043] T - transformer, V01 - rectifier bridge, F12 - first thermal relay, F13 - second thermal relay, F14 - third thermal relay, K11 - ahead starting relay, K12 - astern starting relay, K24 - emergency cut-off relay, K25 - first thermal relay control relay, K26 - second thermal relay control relay, K27 - third thermal relay control relay, K28 - thermal relay protection relay, PLUG 1 - control box power interface, PLUG 2 - turning gear power interface, PLUG3 - first turning gear motor control interface, PLUG 4 - second turning gear motor control interface, PLUG 5 - remote control handle interface, Q04 - switch, S10 - thermal relay gear selection switch, S20 - emergency stop button. DETAILED DESCRIPTION OF THE INVENTION

[0044] The following further specifically describes in detail the multi-functional control box for a marine low-speed diesel engine turning gear according to the present invention with reference to the accompanying drawings, but the scope of the present invention claimed cannot be limited thereby.

[0045] The present invention is used to control the turning gears of various models of marine low-speed diesel engines, including turning gears with a built-in brake control module inside the motor and turning gears without a built-in brake control module inside the motor. The turning gear includes a motor and a brake device, and the brake device includes a brake coil, a spring, and a brake pad. The multi-functional control box controls the start and stop of the motor to complete the turning operation of the turning gear, and at the same time realizes overload protection for the motor.

[0046] As Figure 1 shown, the multi-functional control box for the turning gear of marine low-speed diesel engines includes: a box body, a transformer T, a rectifier bridge V01, a switch Q04, a ahead starting relay K11, an astern starting relay K12, a first thermal relay F12, a second thermal relay F13, a third thermal relay F14, a thermal relay gear selection switch S10, a first thermal relay control relay K25, a second thermal relay control relay K26, a third thermal relay control relay K27, a thermal relay protection relay K28, an emergency cut-off relay K24 and a remote control handle. Except for the remote control handle, other components are installed inside the box body.

[0047] The bottom of the box body is provided with a control box power supply interface PLUG 1, a turning gear power supply interface PLUG 2, a first turning gear motor control interface PLUG 3, a second turning gear motor control interface PLUG 4 and a remote control handle interface PLUG 5. The control box power supply interface PLUG 1, the turning gear power supply interface PLUG 2, the first turning gear motor control interface PLUG 3, the second turning gear motor control interface PLUG 4 and the remote control handle interface PLUG 5 are aviation plugs for connecting the in-and-out cables.

[0048] Considering that the multi-functional control box is installed on the platform and the platform needs to be lifted when arranging the diesel engine, the in-and-out cables of the multi-functional control box need to be removed before lifting to avoid cable breakage during the lifting process. Before the previous platform lifting, professional electricians were required to remove the cables. After the platform was lifted in place, the cables were reconnected. Frequent removal and reconnection would cause wear to the cable connection terminals and increase the workload of the operators. For these reasons, the in-and-out cables are designed as aviation plug types. During the subsequent lifting of the platform in the station, professional electricians are no longer required to participate. Only the lifting operators need to directly pull out and insert the aviation plugs, which not only saves the workload but also protects the cable connection terminals.

[0049] The control box power supply interface PLUG 1 is used for the power supply of the entire multi-functional control box, externally connecting to the industrial AC power supply and internally connecting to the primary side of the transformer T.

[0050] The turning gear power supply interface PLUG 2 is used to provide power to the turning gear, externally connecting to the motor of the turning gear and internally connecting to the control box power supply interface PLUG 1 through the contacts of the first thermal relay F12, the second thermal relay F13, the third thermal relay F14, the ahead starting relay K11 and the astern starting relay K12.

[0051] Since the diesel engine models manufactured on the table are not fixed, and the power of the barring gear motors for different models of diesel engines is different, the requirements for the models of thermal relays used to protect the motors are also different. In order to achieve overload protection for the motor during the operation of the barring gear and enable the multifunctional control box to adapt to the use of barring gears of various models, three thermal relays, namely the first thermal relay F12, the second thermal relay F13, and the third thermal relay F14, are set as the overload protection for the motor during the barring process, achieving full coverage of all barring gear motor powers from small to large. The rated working currents of the motors of existing and new models to be launched in the next few years are summarized, statistically analyzed, and the models of the three thermal relays are reasonably selected. Among them, the first thermal relay F12 is of the LRD340C model and can protect the barring gear motor with a rated current of 30 - 40A; the second thermal relay F13 is of the LRD32C model and can protect the barring gear motor with a rated current of 18 - 32A; the third thermal relay F14 is of the LRD16C model and can protect the barring gear motor with a rated current of 6 - 18A. Thus, each thermal relay protects a certain range, and the three thermal relays can cover the protection of all models. Through the thermal relay gear selection switch S10, any one of the thermal relays can be selected for protection control.

[0052] The first barring gear motor control interface PLUG 3 is used to control the barring gear motor with an internal brake control module, externally connect the brake control module of the barring gear motor with the internal brake control module to achieve quick braking and barring operation of the barring gear with the internal brake control module, and internally connect the contacts of the ahead starting relay K11 and the astern starting relay K12.

[0053] The second barring gear motor control interface PLUG 4 is used to control the barring gear motor without an internal brake control module, externally connect the brake coil of the brake device of the barring gear motor without the internal brake control module, and internally connect the secondary of the transformer T through the contacts of the ahead starting relay K11, the astern starting relay K12, the rectifier bridge V01, and the switch Q04.

[0054] Since the barring gear motor does not have an internal brake control module, the rectifier bridge V01 is set as the brake control module for controlling the brake device. The rectifier bridge V01 is a full-wave rectifier bridge, which takes alternating current from the secondary side of the transformer T and converts it into direct current, with an AC input of 110V and a DC output of 99V, and is led out through the second barring gear motor control interface PLUG 4 for use by the barring gear motor without an internal brake control module to achieve the barring operation of the barring gear without an internal brake control module.

[0055] The remote control handle interface PLUG 5 is used for the stop control of the barring motor. It is externally connected to the remote control handle and internally connected to the secondary of the transformer T. The two ends of the secondary are connected to the normally closed contacts of the ahead starting relay K11, astern starting relay K12, first thermal relay control relay K25, second thermal relay control relay K26, third thermal relay control relay K27, thermal relay protection relay K28, emergency cut-off relay K24, thermal relay gear selection switch S10, as well as the contacts of the first thermal relay F12, second thermal relay F13, and third thermal relay F14.

[0056] The first thermal relay control relay K25, second thermal relay control relay K26, and third thermal relay control relay K27 use normally closed contacts to interlock with the other two relays to prevent multiple thermal relays from being simultaneously engaged for protection. At the same time, the ahead starting relay K11 and the astern starting relay K12 are interlocked through contacts to prevent the simultaneous issuance of ahead and astern commands.

[0057] Please refer to Figure 2 , the remote control handle is used to directly and quickly cut off the power supply and stop the barring machine in case of an emergency during barring operation. The remote control handle includes an emergency stop button S20.

[0058] During the use of the barring machine, the assembly operations of some diesel engines have high requirements for the precise start and stop of the barring machine, especially the stop command. If the barring machine cannot stop in time and continues to drive the crankshaft of the diesel engine to rotate, it may cause damage to the crankshaft or other components. An extreme case of a failure may occur when the remote control handle gives a stop signal, but the contactor in the control box fails to disconnect due to a fault, that is, the motor power supply cannot be disconnected, resulting in the barring machine not being able to stop. The emergency stop button S20 is set exactly to deal with such faults.

[0059] The box body of the multifunctional control box is arranged on the bench platform. Operators may casually place different types of parts or sundries such as water bottles and water cups on the box body. There has been a situation where a water bottle overturned and the water flowed into the control box, causing electrical component failures. To solve this problem, the top of the box body adopts an inclined type with an angle to achieve the function of preventing the placement of items and avoid operators from placing parts or sundries such as water bottles.

[0060] The working principle and process of the multifunctional control box are as follows:

[0061] 1) For the barring machine that controls the built-in brake control module of the motor:

[0062] The power supply interface PLUG 1 of the control box is connected to an external AC power supply. The power supply interface PLUG 2 of the barring gear is connected to the motor of the barring gear with a built-in brake control module inside. The first barring gear motor control interface PLUG 3 is connected to the brake control module of the motor, enabling the motor to have non-delay braking when powered off, ensuring no vehicle slipping failure during braking, and thus completing the quick braking and barring operation of the barring gear with the built-in brake control module.

[0063] 2) For controlling a barring gear whose motor does not have a built-in brake control module:

[0064] The power supply interface PLUG 1 of the control box is connected to an external AC power supply. The power supply interface PLUG 2 of the barring gear is connected to the motor of the barring gear without a built-in brake control module inside. The second barring gear motor control interface PLUG 4 is connected to the brake coil of the brake device of the motor. When the switch Q04 is turned on, the rectifier bridge V01 is powered on and outputs 99V DC. After the ahead starting relay K11 or astern starting relay K12 operates and its contacts close, the brake coil obtains DC working power and operates, the brake pads disengage, the motor rotates, and at the same time the barring gear starts, thus completing the barring operation of the barring gear without a built-in brake control module.

[0065] 3) To achieve overload protection for the motor:

[0066] According to the power and rated current of the barring gear motor, through the thermal relay gear selection switch S10, the corresponding one of the first thermal relay control relay K25, the second thermal relay control relay K26, and the third thermal relay control relay K27 is selected to be connected. After this relay is powered on, its normally open contacts close, and the first thermal relay F12, the second thermal relay F13, or the third thermal relay F14 connected to this relay works. If the motor has a thermal overload, the normally closed contacts of the corresponding first thermal relay F12, the second thermal relay F13, or the third thermal relay F14 will open. The thermal relay protection relay K28 connected to this normally closed contact loses power and its normally open contacts open, the control circuit loses power completely, cutting off the power supply of the motor and providing thermal overload protection for the motor.

[0067] 4) To perform an emergency stop for the barring gear:

[0068] The remote control handle interface PLUG 5 is connected to the remote control handle. Please refer to Figure 2 , when an emergency occurs, cut off the emergency stop button S20. The emergency cut-off relay K24 loses power and its normally open contacts open, the control circuit loses power completely, cutting off the power supply of the motor, and the motor stops rotating quickly, realizing the emergency stop of the barring gear.

[0069] The above are only the preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. The protection scope required by the present invention should also include obvious transformations and alternative solutions to the present invention.

Claims

1. A multi-functional control box for a turning gear of a marine low-speed diesel engine, the turning gear comprising a motor and a braking device, the braking device including a brake coil, a spring and a brake pad; characterized in that: The described multi-functional control box is internally provided with a brake control module connected to the brake device to control the motor of the barring gear, so as to realize the barring operation of the barring gear without a brake control module. At the same time, a thermal relay with three gears is configured to cover the barring gears of marine low-speed diesel engines of various models, and overload protection of the motor of the barring gear is realized; The described multi-functional control box includes a box body, a transformer, a rectifier bridge, a switch, a ahead starting relay, an astern starting relay, a first thermal relay, a second thermal relay, a third thermal relay, a thermal relay gear selection switch, a first thermal relay control relay, a second thermal relay control relay, a third thermal relay control relay, a thermal relay protection relay and an emergency cut-off relay; The box body is provided with a control box power interface, a barring gear power interface, a first barring gear motor control interface, a second barring gear motor control interface and a remote control handle interface; The control box power interface is used for the power supply of the entire multi-functional control box, externally connected to the industrial AC power supply, and internally connected to the primary of the transformer; The barring gear power interface is used to provide power for the barring gear, externally connected to the motor of the barring gear, and internally connected to the control box power interface through the contacts of the first thermal relay, the second thermal relay, the third thermal relay, the ahead starting relay and the astern starting relay; The first barring gear motor control interface is used to control the motor of the barring gear with a built-in brake control module, externally connected to the brake module of the motor of the barring gear with a built-in brake control module, and internally connected to the contacts of the ahead starting relay and the astern starting relay; The second barring gear motor control interface is used to control the motor of the barring gear without a brake control module, externally connected to the brake device of the motor of the barring gear without a brake control module, and internally connected to the secondary of the transformer through the contacts of the ahead starting relay and the astern starting relay, the rectifier bridge and the switch; The remote control handle interface is used for the stop control of the motor, externally connected to the remote control handle, and internally connected to the secondary of the transformer. The two ends of the secondary are connected to the contacts of the ahead starting relay, the astern starting relay, the first thermal relay control relay, the second thermal relay control relay, the third thermal relay control relay, the thermal relay protection relay, the emergency cut-off relay, the thermal relay gear selection switch, and the first thermal relay, the second thermal relay and the third thermal relay; When the switch is turned on, the rectifier bridge is powered on and outputs direct current. The ahead starting relay or the astern starting relay acts. The brake coil obtains the working power supply and acts. The brake pads are disengaged. The motor rotates. At the same time, the barring gear starts, thus completing the barring operation of the barring gear without a brake control module; The thermal relay gear selection switch selects and turns on one of the first thermal relay control relay, the second thermal relay control relay, and the third thermal relay control relay. The contact of this relay closes, and the first thermal relay, the second thermal relay, or the third thermal relay that is connected to this relay and corresponds to the motor power and rated current of the barring gear operates. If the motor experiences thermal overload, the contacts of the corresponding first thermal relay, second thermal relay, or third thermal relay will open. The thermal relay protection relay connected to this contact loses power and its contacts open, causing the entire control circuit to lose power, cutting off the power supply of the motor, and achieving thermal overload protection for the motor. In case of an emergency, cut off the emergency stop button S20 of the remote control handle. The emergency cut-off relay loses power and its contacts open, causing the entire control circuit to lose power, cutting off the power supply of the motor, and achieving emergency stop of the barring gear.

2. The multifunctional control box for the turning gear of a marine low-speed diesel engine according to claim 1, characterized in that: The rectifier bridge is a full-wave rectifier bridge and is used as a brake control module for controlling the brake device, converting the input 110V alternating current into an output 99V direct current.

3. The multifunctional control box for the turning gear of a marine low-speed diesel engine according to claim 1, characterized in that: The first thermal relay is LRD340C, which is used to protect a motor with a rated current of 30 - 40A. The second thermal relay is LRD32C, which is used to protect a motor with a rated current of 18 - 32A. The third thermal relay is LRD16C, which is used to protect a motor with a rated current of 6 - 18A, thus achieving overload protection for the motors of various barring gears.

4. The multi-functional control box for the turning gear of a marine low-speed diesel engine according to claim 1, characterized in that: The first thermal relay control relay, the second thermal relay control relay, and the third thermal relay control relay are interlocked by contacts, and the ahead starting relay and the astern starting relay are interlocked by contacts.

5. The multifunctional control box for the turning gear of a marine low-speed diesel engine according to claim 1, characterized in that: The control box power interface, the barring gear power interface, the first barring gear motor control interface, the second barring gear motor control interface, and the remote control handle interface are aviation plugs.

6. The multi-functional control box for the turning gear of a marine low-speed diesel engine according to claim 1, characterized in that: The top of the box body adopts an inclined structure.

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