Speed ​​measuring device for marine diesel engine and installation method thereof

Abstract

A speed measuring device for a marine diesel engine and its installation method include a speed sensor, an electromagnetic bracket, and a control box. The speed sensor is fixed to the electromagnetic bracket, which is fixed to the frame by electromagnetic force. The control box is electrically connected to the electromagnetic bracket to provide power to the electromagnetic bracket. The speed sensor's probe is close to the flywheel teeth and the detection spacing meets the predetermined requirements, thereby completing the speed measurement of the marine diesel engine. The installation method includes: preparing an AC power supply for the control box, preparing a DC power supply for the electromagnetic base plate, preparing an alarm system, preparing a parking system, charging and supplying power to the battery, installing the speed measuring device, adjusting and fixing the position of the electromagnetic bracket, and adjusting the detection spacing of the speed sensor until the spacing between the probe of the speed sensor and the top of the flywheel teeth meets the predetermined detection spacing requirements. The present invention uses electromagnetic adsorption for fixation and has the advantages of simple operation, flexible adjustment, cost savings, and wide adaptability.

Description

Technical Field

[0001] The present invention relates to a speed measuring technology for a marine diesel engine, in particular to a speed measuring device for a marine diesel engine and an installation method thereof, belonging to the technical field of marine diesel engines. Background Art

[0002] When marine diesel engines undergo speed testing in the workshop, speed sensors that come with the test equipment are usually used. The current practice is to temporarily weld a flange plate to the frame of each diesel engine being tested, and then bolt the bracket containing the speed sensor to the flange plate. After the test is completed, the sensor and bracket are removed for subsequent use, while the flange plate welded to the frame is discarded and never reused. To meet the technical requirements for speed sensor installation, when welding the flange plate, the speed sensor, sensor bracket, and flange plate must be assembled into a whole. After initial positioning, the flange plate is welded and fixed. The sensor bracket and speed sensor are then fine-tuned to meet the sensor installation requirements. If the adjustment range is exceeded, the bracket must be remade. This installation method is cumbersome, inefficient, wastes materials, and increases costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a speed measuring device for a marine diesel engine and an installation method thereof, in view of the shortcomings of the existing technology, eliminating the temporarily welded flange seat plate, achieving the purpose of convenient and rapid installation and repeated positioning of the speed sensor, and achieving the effect of improving operating efficiency and reducing process costs.

[0004] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0005] A speed measuring device for a marine diesel engine, the marine diesel engine including an automatic parking system, an alarm system, a frame and a flywheel, the flywheel having flywheel teeth, characterized in that: the speed measuring device includes a speed sensor, an electromagnetic bracket and a control box; the speed sensor is fixed to the electromagnetic bracket via a locking nut, the electromagnetic bracket is fixed to the frame via electromagnetic force, the control box is electrically connected to the electromagnetic bracket to provide power to the electromagnetic bracket; the detection head of the speed sensor is close to the flywheel teeth and the detection spacing meets predetermined requirements to complete the speed measurement of the marine diesel engine.

[0006] As a further improvement, the electromagnetic bracket includes a sensor mounting plate, an I-beam, bolts, a distance tube, a bottom plate and an electromagnetic base plate;

[0007] The sensor mounting plate, I-beam and base plate are welded into one. The sensor mounting plate is used to install the speed sensor and is welded to the front end of the horizontal I-beam. The base plate is welded to the rear end of the I-beam and is perpendicular to the I-beam. The base plate is in contact with the electromagnetic seat plate and is provided with a through hole. The electromagnetic seat plate is adsorbed on the frame by electromagnetic force and is provided with a coil that generates magnetism when energized. The coil is electrically connected to the control box. The bolts are connected to the threaded holes on the electromagnetic seat plate through the through holes on the distance tube and the base plate, connecting the sensor mounting plate, I-beam and base plate to the electromagnetic seat plate to form the electromagnetic bracket.

[0008] As a further improvement, the speed sensor is provided with an external thread, and the sensor mounting plate is provided with a threaded hole with the same thread specification as the external thread.

[0009] As a further improvement, the electromagnetic base plate is provided with a junction box connected to the internal coil for connecting to the control box.

[0010] As a further improvement, the control box converts AC power into DC power and inputs it into the electromagnetic seat plate, including an AC power indicator light, a battery power indicator light, a DC power indicator light, a seat plate power indicator light, an AC power switch, a seat plate power switch, a battery, an alarm switch and a parking switch; the AC power switch is connected to an external AC power supply, the seat plate power switch is connected to the electromagnetic seat plate, the alarm switch is connected to the alarm system, and the parking switch is connected to the automatic parking system.

[0011] Another technical solution of the present invention is as follows:

[0012] A method for installing the speed measuring device for a marine diesel engine comprises the following specific steps:

[0013] 1) Preparing the AC power supply for the control box: Connect the AC power switch to an external AC power source and supply power. Set the AC power switch to the "on" position, and the AC power indicator light will turn on, and the DC power indicator light will turn on at the same time. Set the AC power switch to the "off" position, and the AC power indicator light will turn off, and the DC power indicator light will turn off at the same time.

[0014] 2) Preparation for DC power supply of electromagnetic seat: Connect the seat power switch to the electromagnetic seat, set the AC power switch to the "on" position, and the seat power switch is set to the "on" position. The seat power indicator light is on. Set the seat power switch to the "off" position and the seat power indicator light is off.

[0015] 3) Preparation of the alarm system: Connect the alarm switch to the alarm system, set the AC power switch to the "off" position, and the alarm switch will send a power failure alarm signal to the alarm system. Set the AC power switch to the "on" position to release the power failure alarm signal.

[0016] 4) Preparing the parking system: Connect the parking switch to the automatic parking system. When the AC power is off and the battery is low, the parking switch sends an automatic parking signal to the automatic parking system. When the AC power is on, the battery is fully charged, and the seat power switch is set to the "on" position, the automatic parking signal is released.

[0017] 5) Battery Charging: Set the AC power switch to the "on" position to charge the battery. Set the AC power switch to the "off" position and the battery is fully charged. The battery power indicator light will turn on, and the DC power indicator light will turn on at the same time.

[0018] 6) Battery power supply: Set the AC power switch to the "off" position. If the battery has power, the control box automatically switches to the battery power supply mode. The battery power indicator light is on and the DC power indicator light is on. If the battery is low on power, the parking switch sends an automatic parking signal to the automatic parking system.

[0019] 7) Installation of the speed measuring device: Install the speed sensor on the sensor mounting plate and tighten it with the locking nut. Connect the base plate to the electromagnetic base plate with the bolts and distance tubes to complete the assembly of the electromagnetic bracket. Move the electromagnetic bracket to the vicinity of the flywheel and fit the electromagnetic base plate to the frame.

[0020] 8) Adjusting and fixing the position of the electromagnetic bracket: Move the electromagnetic bracket on the frame so that the distance between the detection head of the speed sensor and the top of the flywheel tooth initially meets the technical requirements, set the base plate power switch to the "on" position, and fix the electromagnetic base plate to the frame through electromagnetic force, completing the installation and fixation of the electromagnetic bracket and speed sensor on the frame;

[0021] 9) Adjusting the speed sensor detection spacing: Loosen the locking nut, rotate the speed sensor, change the spacing between the detection head of the speed sensor and the top of the flywheel tooth, adjust the spacing to meet the predetermined detection spacing requirement, and then tighten the locking nut;

[0022] 10) If the predetermined requirement for the detection spacing cannot be met after step 9), set the base plate power switch to the "off" position and repeat steps 8) to 9) until the distance between the detection head of the speed sensor and the top of the flywheel tooth meets the predetermined requirement for the detection spacing.

[0023] As a further improvement, the predetermined requirement for the detection spacing is 3 mm.

[0024] Compared with the traditional installation method of marine diesel engine speed sensor, the present invention has the following advantages:

[0025] 1. The speed measuring device is installed and fixed by electromagnetic adsorption force, so the installation operation is simple and convenient.

[0026] 2. Since the electromagnetic force is generated and eliminated by turning on and off the coil, the adjustment of the position of the speed measuring device is very simple and flexible.

[0027] 3. Since the traditional operation method of remaking the bracket and discarding the flange seat plate is avoided, the effect of saving costs and avoiding waste is achieved.

[0028] 4. The present invention can not only meet the testing needs of marine diesel engines during workshop production, but can also be promoted and applied to test equipment that requires temporary installation of sensors. The speed measuring device is also suitable for the installation of other sensors that are installed using threads, and has the advantage of a wide range of adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the device structure of the present invention.

[0030] Figure 2 is a schematic diagram of the electromagnetic bracket.

[0031] Figure 3 yes Figure 2 Left view of .

[0032] Figure 4 yes Figure 2 Bottom view of .

[0033] Figure 5 This is a schematic diagram of the control box.

[0034] Figure 6 This is the alarm and parking signal process of the present invention.

[0035] Figure 7 It is a schematic diagram of the installation and application of the present invention.

[0036] In the figure,

[0037] A—frame, B—flywheel, B1—flywheel teeth, 01—speed sensor, 02—electromagnetic bracket, 03—locking nut, 1—sensor mounting plate, 2—I-beam, 3—bolt, 4—distance tube, 5—base plate, 6—electromagnetic seat plate, 7—AC power indicator light, 8—battery power indicator light, 9—DC power indicator light, 10—seat plate power indicator light, 11—AC power switch, 12—seat plate power switch, 13—battery, 14—alarm switch, 15—parking switch, 16—control box, 17—junction box. DETAILED DESCRIPTION

[0038] The speed measuring device for a marine diesel engine and the installation method thereof according to the present invention will be further described in detail below with reference to the accompanying drawings and specific examples.

[0039] The present invention is used to install a speed sensor to complete the speed measurement of a marine diesel engine. Figure 7 The marine diesel engine includes a frame A and a flywheel B, the flywheel B has flywheel teeth B1, and the speed measuring device is installed on the frame A and close to the flywheel B.

[0040] like Figure 1 As shown, the speed measuring device for a marine diesel engine includes a speed sensor 01, an electromagnetic bracket 02 and a control box 16; the speed sensor 01 has an external thread for installation on its body, which is fixed to the electromagnetic bracket 02 by two locking nuts 03, and the electromagnetic bracket 02 is fixed to the frame A. The control box 16 is electrically connected to the electromagnetic bracket 02 to provide power to the electromagnetic bracket 02.

[0041] Please refer to Figure 2 、 Figure 3 and Figure 4 The electromagnetic bracket 02 includes a sensor mounting plate 1, an I-beam 2, bolts 3, a distance tube 4, a base plate 5 and an electromagnetic base plate 6.

[0042] The sensor mounting plate 1, I-beam 2, and base plate 5 are welded together into a single unit. The I-beam 2 is positioned horizontally to connect the sensor mounting plate 1 and base plate 5. The sensor mounting plate 1 is welded horizontally to the front end of the I-beam 2 for mounting the speed sensor 01. The sensor mounting plate 1 is provided with a number of threaded holes, the thread specifications of which are the same as the external threads on the body of the speed sensor 01. The base plate 5 is welded upright to the rear end of the I-beam 2 and is perpendicular to the I-beam 2. It is used to connect to the contact surface of the electromagnetic base plate 6 and is provided with a number of through-holes.

[0043] The bolts 3 pass through the through holes on the distance tube 4 and the base plate 5 to connect the sensor mounting plate 1, the I-beam 2 and the base plate 5 to the electromagnetic base plate 6 to form the electromagnetic bracket 02 assembly.

[0044] The electromagnetic base plate 6 is used to connect and secure the electromagnetic support 02 and speed sensor 01 to the marine diesel engine's frame A. The electromagnetic base plate 6 houses a coil that generates magnetism when energized, allowing it to adhere to a metal surface. The base plate 6 has threaded holes for connection to the base plate 5. A junction box 17 is also provided on the base plate 6, serving as a terminal block for connection to the control box 16 to provide power to the internal coil. When the control box 16 is powered by the coil, the electromagnetic base plate 6 is attracted to the metal frame A through electromagnetic force, securing the electromagnetic support 02 and speed sensor 01. After adjustment and securing, the speed sensor 01's probe approaches the flywheel teeth B1 of the marine diesel engine's flywheel B, achieving the predetermined detection spacing.

[0045] The control box 16 is connected to the electromagnetic base plate 6 of the electromagnetic bracket 02, and converts the AC input power or automatically switches to battery power to provide DC power to the coil in the electromagnetic base plate 6. Figure 5 As shown, the control box 16 includes an AC power indicator light 7, a battery power indicator light 8, a DC power indicator light 9, a seat plate power indicator light 10, an AC power switch 11, a seat plate power switch 12, a battery 13, an alarm switch 14, and a stop switch 15. The AC power indicator light 7, battery power indicator light 8, DC power indicator light 9, seat plate power indicator light 10, AC power switch 11, and seat plate power switch 12 are located on the panel of the control box 16, while the battery 13, alarm switch 14, and stop switch 15 are located inside the control box 16. The AC power switch 11 is connected to the AC power source via a cable, the seat plate power switch 12 is connected to the coil junction box 17 of the electromagnetic seat plate 6 via a cable, the alarm switch 14 is connected to an alarm signal input channel of the test bench alarm system via a cable, and the stop switch 15 is connected to a stop signal input channel of the test bench automatic parking system via a cable.

[0046] The working process of the control box 16 is as follows Figure 6As shown. When the AC power switch 11 is set to the "on" position and the external power is connected, the AC power indicator light 7 lights up; when the external power is cut off or the AC power switch 11 is set to the "off" position, the AC power indicator light 7 goes out. When the AC power switch 11 is set to the "on" position and the external power is connected, the battery power indicator light 8 goes out; when the AC power switch 11 is set to the "on" position and the external power is cut off, or when the AC power switch 11 is set to the "off" position, the device automatically switches to the battery power mode and the battery power indicator light 8 lights up. When the AC power is converted to DC power or when the battery 13 supplies power, the DC power indicator light 9 lights up. When the seat plate power supply switch 12 is set to the "on" position, the coil of the electromagnetic seat plate 6 connected to the seat plate power supply switch 12 is energized, and the seat plate power indicator light 10 lights up; when the seat plate power supply switch 12 is set to the "off" position, the seat plate power indicator light 10 goes out. When the AC power is connected, the battery 13 is charged; when the AC power is disconnected, the battery 13 continues to provide power. The alarm switch 14 is connected to the test bench alarm system. When the AC power is disconnected, the alarm switch 14 switches state and issues an alarm signal; when the AC power is connected, the alarm signal is released. The parking switch 15 is connected to the test bench automatic parking system. When the AC power is disconnected and the battery 13 is low, the parking switch 15 switches state and issues an automatic parking signal. The automatic parking signal is released only when the AC power is connected, the battery 13 is fully charged, and the seat power switch 12 is set to the "on" position.

[0047] The method for installing the speed measuring device for a marine diesel engine of the present invention comprises the following specific steps: Figure 7 :

[0048] 1) Preparation of AC power supply for the control box: Set the AC power switch 11 on the control box 16 to the "off" position, connect the power cable to the wiring terminals of the AC power switch 11 of the control box 16, supply AC power, set the AC power switch 11 on the control box 16 to the "on" position, the AC power indicator light 7 on the control box 16 will light up, and the DC power indicator light 9 will light up at the same time; set the AC power switch 11 on the control box 16 to the "off" position, the AC power indicator light 7 will go out, and the DC power indicator light 9 will go out at the same time.

[0049] 2) Preparation for DC power supply of the electromagnetic seat coil: Set the seat power supply switch 12 on the control box 16 to the "off" position, connect one end of the cable to the terminal of the seat power supply switch 12 on the control box 16, and the other end to the coil terminal box 17 of the electromagnetic seat 6; Set the AC power switch 11 on the control box 16 to the "on" position, set the seat power supply switch 12 to the "on" position, the seat power indicator light 10 lights up, set the seat power supply switch 12 to the "off" position, the seat power indicator light 10 goes out, and the AC power switch 11 on the control box 16 is set to the off position.

[0050] 3) Preparation of the alarm system: Use a cable to connect the AC power failure alarm switch 14 in the control box 16 to an alarm signal input channel of the test bench alarm system. At this time, the alarm system has an AC power failure alarm signal sent by the control box. Set the AC power switch 11 on the control box 16 to the "on" position, and the power failure alarm signal will be released.

[0051] 4) Preparation of parking system: Use a cable to connect the parking switch 15 in the control box 16 to a parking signal input channel of the test bench automatic parking system. If the battery is low on power, the automatic parking system will receive an automatic parking signal from the control box and set the seat power supply switch 12 to the "on" position; after the battery 13 is fully charged, the automatic parking signal from the control box will be released and the seat power supply switch 12 will be set to the "off" position.

[0052] 5) Battery Charging: After the control box 16 converts AC power into DC power, it charges the battery 13; the AC power switch 11 on the control box 16 is set to the "on" position, and the battery 13 in the control box 16 is charged at the same time. The AC power switch 11 on the control box 16 is set to the "off" position, the battery 13 is fully charged, the battery power indicator light 8 on the control box 16 is on, and the DC power indicator light 9 is still on. The seat power switch 12 is set to the "on" position, and the automatic parking signal of the control box is released.

[0053] 6) Battery power supply: Set the AC power switch 11 on the control box 16 to the "off" position to automatically switch to the battery power supply mode. The battery power indicator light 8 on the control box 16 will light up and the DC power indicator light 9 will light up.

[0054] 7) Installation of the speed measuring device: Install the speed sensor 01 in the threaded hole on the sensor mounting plate 1, leaving it exposed to a certain length as required, and use the two locking nuts 03 provided with the speed sensor 01 to lock the speed sensor 01 on both sides of the sensor mounting plate 1; use bolts 3 and distance tubes 4 to connect the electromagnetic base plate 6 through the through holes in the base plate 5 to complete the assembly of the electromagnetic bracket 02; move the electromagnetic bracket 02 to the flywheel end of the diesel engine, and align the electromagnetic base plate 6 with the plane of the diesel engine frame A.

[0055] 8) Adjustment and fixation of the electromagnetic bracket position: Move the electromagnetic bracket 02 on the plane of the frame A so that the distance between the detection head of the speed sensor 01 and the top of the flywheel tooth B1 of the flywheel B initially meets the technical requirements; set the seat plate power supply switch 12 on the control box 16 to the "on" position, so that the electromagnetic seat plate 6 is fixed to the metal plane of the frame A by electromagnetic force, completing the installation and fixation of the electromagnetic bracket 02 and the speed sensor 01 on the frame A.

[0056] 9) Adjustment of the speed sensor detection spacing: Loosen the locking nuts 03 on both sides of the sensor mounting plate 1, rotate the speed sensor 01 clockwise or counterclockwise to increase or decrease the spacing between the detection head of the speed sensor 01 and the top of the flywheel tooth B1. Adjust the spacing to meet the predetermined requirement of 3mm, and tighten the locking nuts 03.

[0057] 10) If the predetermined detection spacing requirement cannot be met after step 9), set the seat plate power switch 12 to the "off" position and repeat steps 8) to 9) until the distance between the detection head of the speed sensor 01 and the top of the flywheel tooth B1 meets the predetermined detection spacing requirement of 3 mm.

[0058] The embodiments described are not intended to limit the scope of implementation of the present invention. The scope of protection required by the present invention is not limited to the above embodiments, but should also include other obvious changes and alternatives to the present invention. All equivalent changes and modifications made based on the contents of the present invention should fall within the scope of the present invention.

Claims

1. A method for installing a speed measuring device for a marine diesel engine, wherein the marine diesel engine includes an automatic shutdown system, an alarm system, a frame, and a flywheel having flywheel teeth; characterized in that: The speed measuring device includes a speed sensor, an electromagnetic bracket, and a control box; the speed sensor is fixed to the electromagnetic bracket via a locking nut, and the electromagnetic bracket is fixed to the frame via electromagnetic force; the control box is electrically connected to the electromagnetic bracket to provide power to the electromagnetic bracket; the detection head of the speed sensor is close to the flywheel teeth and the detection spacing meets the predetermined requirements to complete the speed measurement of the marine diesel engine; The electromagnetic bracket includes a sensor mounting plate, an I-beam, bolts, a distance tube, a bottom plate and an electromagnetic base plate. The sensor mounting plate, the I-beam and the bottom plate are welded into one. The sensor mounting plate is used to install the speed sensor and is welded to the front end of the horizontal I-beam. The bottom plate is welded to the rear end of the I-beam and is perpendicular to the I-beam. The bottom plate is in contact with the electromagnetic base plate and is provided with a through hole. The electromagnetic base plate is adsorbed on the frame by electromagnetic force and is provided with a coil that generates magnetism when energized. The coil is electrically connected to the control box. The bolts are connected to the threaded holes on the electromagnetic base plate through the distance tube and the through holes on the bottom plate. The sensor mounting plate, the I-beam and the bottom plate are connected to the electromagnetic base plate to form the electromagnetic bracket. The control box converts AC power into DC power and inputs it into the electromagnetic seat, and includes an AC power indicator light, a battery power indicator light, a DC power indicator light, a seat plate power indicator light, an AC power switch, a seat plate power switch, a battery, an alarm switch, and a parking switch; the AC power switch is connected to an external AC power source, the seat plate power switch is connected to the electromagnetic seat, the alarm switch is connected to the alarm system, and the parking switch is connected to the automatic parking system; The installation method includes the following specific steps: 1) Prepare the AC power supply for the control box: Connect the AC power switch to an external AC power source and supply power. Set the AC power switch to the "on" position; the AC power indicator light will turn on, and the DC power indicator light will turn on. Set the AC power switch to the "off" position; the AC power indicator light will turn off, and the DC power indicator light will turn off. 2) Preparation for DC power supply of electromagnetic seat: Connect the seat power switch to the electromagnetic seat, set the AC power switch to the "on" position, and the seat power switch is also set to the "on" position. The seat power indicator light is on. Set the seat power switch to the "off" position and the seat power indicator light goes off. 3) Preparation of the alarm system: Connect the alarm switch to the alarm system and set the AC power switch to the "off" position. The alarm switch will send a power failure alarm signal to the alarm system. Set the AC power switch to the "on" position to release the power failure alarm signal. 4) Preparing the parking system: Connect the parking switch to the automatic parking system. When the AC power is disconnected and the battery is low, the parking switch sends an automatic parking signal to the automatic parking system. When the AC power is restored, the battery is fully charged, and the seat power switch is set to the "on" position, the automatic parking signal is released. 5) Battery Charging: When the AC power switch is set to the "on" position, the battery is charged. When the AC power switch is set to the "off" position and the battery is fully charged, the battery power indicator light turns on and the DC power indicator light turns on at the same time. 6) Battery power supply: Set the AC power switch to the "off" position. If the battery has power, the control box automatically switches to battery power supply mode. The battery power indicator light turns on, and the DC power indicator light turns on. If the battery is low, the parking switch sends an automatic parking signal to the automatic parking system. 7) Installation of the speed measuring device: Install the speed sensor on the sensor mounting plate and tighten it with the locking nut. Connect the base plate to the electromagnetic base plate with the bolts and distance tubes to complete the assembly of the electromagnetic bracket. Move the electromagnetic bracket to the vicinity of the flywheel and fit the electromagnetic base plate to the frame. 8) Adjusting and fixing the position of the electromagnetic bracket: Move the electromagnetic bracket on the frame until the distance between the speed sensor's probe and the top of the flywheel tooth initially meets the technical requirements. Set the base plate power switch to the "on" position. The electromagnetic base plate is fixed to the frame by electromagnetic force, completing the installation and fixation of the electromagnetic bracket and speed sensor on the frame. 9) Adjusting the speed sensor detection distance: Loosen the locking nut, rotate the speed sensor, change the distance between the detection head of the speed sensor and the top of the flywheel tooth, adjust the distance to meet the predetermined detection distance requirement, and then tighten the locking nut; 10) If the predetermined detection spacing requirement cannot be met after step 9), set the base plate power switch to the "off" position and repeat steps 8) to 9) until the distance between the detection head of the speed sensor and the top of the flywheel tooth meets the predetermined detection spacing requirement.

2. The method for installing a speed measuring device for a marine diesel engine according to claim 1, wherein: The speed sensor is provided with an external thread, and the sensor mounting plate is provided with a threaded hole with the same thread specification as the external thread.

3. The method for installing a speed measuring device for a marine diesel engine according to claim 1, wherein: The electromagnetic base plate is provided with a junction box connected to the internal coil and used for connecting to the control box.

4. The method for installing a speed measuring device for a marine diesel engine according to claim 1, wherein: In the step 9), the predetermined requirement for the detection distance is 3 mm.

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