A ship main engine speed detection experimental device and method

Abstract

The invention relates to the technical field of detection equipment, and specifically discloses an experimental device and method for detecting the rotation speed of a ship main engine. The device comprises a box body and a control cabinet. The bottom walls at both ends of the box body are rotatably connected with a vertically arranged power input shaft and a rotation speed detection shaft respectively. The power input shaft extends out of the top of the box body and is connected with the output shaft of the ship main engine. A centrifugal rotation speed measuring mechanism is arranged on the top of the rotation speed detection shaft, and an adjustable belt transmission mechanism is arranged between the power input shaft and the rotation speed detection shaft. The ship main engine rotation speed detection experimental device disclosed by the invention adopts the method of measuring centrifugal force to indirectly detect the rotation speed of the ship main engine, effectively avoiding the problem of poor detection accuracy caused by timing error in the process of photoelectric timing detection of rotation speed. In addition, when detecting the ship main engine in different rotation speed ranges, two different methods can be used to adjust the centrifugal force, so that the rotation speed of the ship main engine in the high rotation speed and low rotation speed ranges can be effectively and accurately detected.

Description

Technical Field

[0001] The invention relates to the technical field of detection equipment, and specifically discloses an experimental device and method for detecting the rotation speed of a ship main engine. Background Art

[0002] As the power device of the ship, the ship's main engine is a machine that provides power for a series of processes such as ship driving and power generation. Existing ship main engines can be mainly divided into four types: steam engine, internal combustion engine, nuclear power engine and electric motor. During its production or disassembly and maintenance, it is necessary to test the speed of the ship's main engine. Existing testing equipment for testing the speed of ship main engines usually uses photoelectric timing, which is not only greatly affected by the external environment and the accuracy of the timer, but also cannot be adjusted according to the speed transmission range of the ship's main engine. When the speed is too high or too low, there will be large errors.

[0003] For example, the invention patent application with application number CN202011169094.7 discloses a ship main engine speed detection test instrument, including a box, a control box is fixedly connected to one side of the bottom of the box, a placement plate is arranged on the top of the control box, a ship main engine is placed above the placement plate, a detection shaft is installed through a bearing on one side of the box, a mounting nut is fixedly connected to one end of the detection shaft, a driving gear is fixedly sleeved on the rod wall of the detection shaft, a reciprocating mechanism is arranged inside the box, and two grating rulers are fixedly connected to the bottom of the inner cavity of the box. The ship main engine speed detection test instrument disclosed in the invention patent uses a photoelectric timing method to obtain the output speed of the main engine, which is still greatly affected by the external environment and the accuracy of the timer, and cannot be adjusted according to the speed delivery interval of the ship main engine. When the speed is too large or too low, there are large errors and other deficiencies. Based on the above-mentioned deficiencies of the existing ship main engine speed detection test instrument, this application proposes a ship main engine speed detection experimental device and method that can effectively solve the above-mentioned technical problems. Summary of the invention

[0004] The purpose of the present invention is to provide a ship main engine speed detection experimental device and method to solve the technical problems existing in the existing ship main engine speed detection test instrument using a photoelectric timing method to perform a ship main engine speed detection experiment.

[0005] The present invention is realized by the following technical scheme: a ship main engine speed detection experimental device, comprising a box body and a control cabinet, the bottom walls at both ends of the box body are rotatably connected with a vertically arranged power input shaft and a speed detection shaft, the power input shaft extends out of the top of the box body and is connected with the output shaft of the ship main engine, a centrifugal speed measuring mechanism is arranged on the top of the speed detection shaft, and an adjustable belt transmission mechanism is arranged between the power input shaft and the speed detection shaft;

[0006] The centrifugal speed measuring mechanism comprises a turntable fixedly connected with the top of the speed detection shaft concentrically, the upper surface of the turntable is provided with a radial slide rail, the radial slide rail is slidably provided with a sliding seat, a vertically arranged weight positioning rod is fixed at the center of the upper surface of the sliding seat, a plurality of counterweight weights are inserted into the weight positioning rod, the sliding seat is fixedly provided with a radial connecting rod parallel to the radial slide rail above and below, the outer end of the radial connecting rod is connected with a first roller, the inner end of the radial connecting rod is connected with a counterweight block, the center of gravity of the sliding seat, the radial connecting rod, the first roller and the counterweight block is located on the central axis of the weight positioning rod, a ring plate body abutting the first roller is concentrically arranged on the periphery of the turntable, a notch is opened on the outer circumferential surface of the ring plate body, a connecting piece is provided on the ring plate body outside the notch, a pressure sensor is provided on the side of the connecting piece facing the notch, and the pressure sensor is electrically connected to the control cabinet, a roller extending into the notch is connected on the pressure bearing surface of the pressure sensor, and the end of the roller is flush with the inner wall of the ring plate body.

[0007] As a further configuration of the above solution, an operation opening is provided on the upper surface of the box body directly above the turntable, and a box cover is provided in the operation opening.

[0008] As a further configuration of the above scheme, the ring plate body includes at least two concentric ring plates with unequal diameters, and the two adjacent ring plates are connected in sequence up and down in a stepped configuration, and a vertical guide rod extending vertically out of the upper surface of the box body is provided on the outside of the ring plate, and an adjusting cylinder for driving the entire ring plate body to move up and down is provided on the upper surface of the box body.

[0009] As a further configuration of the above scheme, a center block is fixed at the center of the upper surface of the turntable, an electromagnet is arranged on the side of the center block facing the counterweight block, and the counterweight block is made of iron material.

[0010] As a further configuration of the above scheme, the adjustable belt transmission mechanism includes a rotating wheel, a transmission wheel and a transmission belt, the rotating wheel is fixedly connected concentrically with the power input shaft, the transmission wheel is fixedly connected concentrically with the speed detection shaft, and the transmission belt is arranged between the rotating wheel and the transmission wheel;

[0011] The upper and lower surfaces of the rotating wheel and the transmission wheel are provided with a plurality of radial slots in an annular array, a friction block that acts on the transmission belt is arranged between the radial slots aligned up and down, and limit blocks that act on the radial slots are arranged at the upper and lower ends of the friction block, one of the limit blocks is connected to the outer end of a radially arranged spring, and the end of the spring is connected to the radial outer end of the rotating wheel or the transmission wheel, and an adjusting disk is concentrically arranged below the rotating wheel and the transmission wheel, and a plurality of wedge-shaped extrusion plates are evenly arranged on the upper surface of the adjusting disk, the wedge-shaped extrusion plates pass through the two radial slots aligned up and down and are arranged in contact with the radial inner end of the friction block, a bearing sleeve connected to the power input shaft or the speed detection shaft is arranged at the center of the lower surface of the adjusting disk, and a convex rod is arranged on the outer surface of the bearing sleeve;

[0012] A lever arm is rotatably arranged just below the midpoint of the line connecting the rotating wheel and the transmission wheel. The two ends of the lever arm are respectively connected to the convex rods on the corresponding bearing sleeves, and a driving member for driving the lever arm to rotate is arranged on the bottom wall of the box body.

[0013] As a further configuration of the above solution, a second roller is rotatably provided at the radial inner end of each friction action block, and the wedge-shaped extrusion plate acts on the friction action block through the second roller.

[0014] As a further configuration of the above solution, the driving member includes a hydraulic telescopic rod rotatably connected to the bottom wall of the box body, and the end of the hydraulic telescopic rod is connected to the radial rod on the middle pin shaft of the lever arm.

[0015] As a further arrangement of the above scheme, two bearing seats are fixed on the bottom walls at both ends of the box body, the lower ends of the power input shaft and the speed detection shaft are respectively connected to the corresponding bearing seats, a frame plate is fixed to the upper end of the inner wall of the box body, and a bearing connected to the upper end of the speed detection shaft is arranged at the end of the frame plate.

[0016] As a further configuration of the above scheme, a mounting bracket is fixed to the upper surface of the box body directly above the power access shaft, and the ship main engine is temporarily installed on the mounting bracket and connected to the top end of the power access shaft through a coupling.

[0017] The present invention also discloses a rotation speed detection method using the above-mentioned ship main engine rotation speed detection experimental device, comprising the following steps:

[0018] 1) Place the ship's main engine on top of the box, and connect the power output shaft of the ship's main engine with the power input shaft;

[0019] 2) According to the main speed range during the stable operation of the ship's main engine, add an appropriate number of counterweights to the sliding seat, and calculate and record the total weight of the objects involved in the centrifugal motion;

[0020] 3) Measure the radial distance from the center point of the sliding seat to the center point of the turntable when the first roller abuts against the inner wall of the ring plate, and record it;

[0021] 4) Start the ship's main engine, and the turntable rotates under the transmission action of the adjustable belt drive mechanism. Then, each time the first roller rotates and moves to the notch, the centrifugal force is directly transmitted to the roller, and the corresponding centrifugal force is measured by the pressure sensor;

[0022] 5) Finally, input the total weight of the centrifugal moving object into the control cabinet and measure the radial distance from the center point of the sliding seat to the center of the turntable. Then the internal control module can accurately calculate the rotation speed of the ship's main engine based on the centrifugal force calculation formula.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The ship main engine speed detection experimental device disclosed in the present invention indirectly detects the speed of the ship main engine by measuring centrifugal force, thereby effectively avoiding the problem of poor detection accuracy caused by timing errors or external environmental influences during the photoelectric timing speed detection process.

[0025] 2. When the centrifugal speed measuring mechanism of the present invention detects the main engine of the ship in different speed ranges, on the one hand, the centrifugal force can be controlled to be within the best and most accurate detection range of the pressure sensor by changing the weight of the centrifugal material by adding or reducing the counterweight weights; on the other hand, the centrifugal force can be controlled to be within the best and most accurate detection range of the pressure sensor by changing the centrifugal radius by controlling the up and down movement of ring plates of different diameters. Through the effective combination of the two methods, the speed of the main engine of the ship in the high and low speed ranges can still be effectively and accurately detected.

[0026] 3. The present invention also adopts a specially designed adjustable belt transmission mechanism to quickly adjust the transmission ratio between the power input shaft and the speed detection shaft. The structural design of the entire adjustable belt transmission mechanism is ingenious and novel. The adjustment process can be completed by simply controlling the extension or shortening of the driving member. The transmission mechanism with a larger adjustable range can enable the centrifugal speed measurement mechanism to adapt to the accurate measurement of various speed ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the external three-dimensional structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the three-dimensional structure of the interior of the present invention from a first angle;

[0030] Figure 3 A schematic diagram of the second angle stereoscopic structure of the interior of the present invention;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the ring plate body in the present invention;

[0032] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0033] Figure 6 It is a three-dimensional structural schematic diagram of the centrifugal speed measuring mechanism and the speed detection shaft in the present invention;

[0034] Figure 7 It is a three-dimensional structural schematic diagram of the adjustable belt transmission mechanism in the present invention;

[0035] Figure 8 It is a schematic diagram of the three-dimensional structure of the rotating wheel or the transmission wheel in the present invention;

[0036] Fig. 9 It is a schematic diagram of the three-dimensional structure of the adjustment disk, wedge-shaped extrusion block, etc. in the present invention;

[0037] Fig.10 It is a schematic diagram of the three-dimensional structure of the friction block, spring, second roller, etc. in the present invention. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 10 , and describes the application in detail with reference to embodiments.

[0040] Example 1

[0041] Embodiment 1 discloses a ship main engine speed detection experimental device, refer to the attached Figure 1-3The main body of the detection experimental device includes a box body 1 and a control cabinet 2. The power access shaft 3 and the speed detection shaft 4 are rotatably connected to the bottom walls at both ends of the box body 1. In the specific design, two bearing seats 102 are fixed on the bottom walls at both ends of the box body 1, and then the lower ends of the power access shaft 3 and the speed detection shaft 4 are connected to the corresponding bearing seats 102 respectively. At the same time, a frame plate 103 is fixed on the upper end of the inner wall of the box body 1, and a bearing connected to the upper end of the speed detection shaft 4 is arranged at the end of the frame plate 103. Then the power access shaft 3 is extended out of the top of the box body 1 and connected to the output shaft of the ship main engine. In the specific design, a mounting bracket 7 is fixed on the upper surface of the box body 1 located directly above the power access shaft 3. The ship main engine can be temporarily installed on the mounting bracket 7, and then the power output shaft of the ship main engine is connected to the top of the power access shaft 3 through the coupling.

[0042] A centrifugal speed measuring mechanism 5 is arranged on the top of the speed detection shaft 4, and an adjustable belt transmission mechanism 6 is arranged between the power input shaft 3 and the speed detection shaft 4. Figure 4-6 The centrifugal speed measuring mechanism 5 includes a turntable 501 which is fixedly connected to the top of the speed detection shaft 4 concentrically. A radial slide rail 502 is arranged on the upper surface of the turntable 501. A sliding seat 503 is slidingly arranged on the radial slide rail 502. A vertically arranged weight positioning rod 507 is fixed at the center of the upper surface of the sliding seat 503. A plurality of counterweights 508 are inserted on the weight positioning rod 507. The specific counterweights 508 are added or reduced according to the actual speed range of the ship's main engine. In addition, in order to facilitate the placement and removal of the counterweights 508, an operation port is opened on the upper surface of the box body 1 located directly above the turntable 501, and a box cover 101 is arranged in the operation port.

[0043] A radial connecting rod 504 parallel to the radial slide rail 502 is fixedly arranged on the sliding seat 503, the outer end of the radial connecting rod 504 is connected to the first roller 505, and the inner end of the radial connecting rod 504 is connected to the counterweight 506. At the same time, the center of gravity of the sliding seat 503, the radial connecting rod 504, the first roller 505 and the counterweight 506 should be set on the central axis of the weight positioning rod 507 during design. An annular plate body 509 abutting against the first roller 505 is concentrically arranged on the periphery of the rotating disk 501, and a notch is opened on the outer circumferential surface of the annular plate body 509. A connecting piece 510 is arranged on the annular plate body 509 outside the notch, and a pressure sensor 511 is arranged on the side of the connecting piece 510 facing the notch, and the pressure sensor 511 is electrically connected to the control cabinet 2. Finally, a roller 512 extending into the notch is connected to the pressure-bearing surface of the pressure sensor 511 , and the end of the roller 512 is arranged flush with the inner wall of the ring plate body 509 .

[0044] In addition, in order to have different reference values ​​when detecting the rotation speed of the ship main engine by measuring the centrifugal force, the ring plate 509 in the present embodiment 1 includes at least two concentric ring plates 5091 with unequal diameters, and the two adjacent ring plates 5091 are sequentially connected up and down to form a stepped arrangement, and three ring plates 5091 are arranged up and down in the present embodiment 1. In addition, a vertical guide rod 5092 extending vertically from the upper surface of the box body 1 is arranged outside the ring plate 5091, and an adjusting cylinder 5093 for driving the entire ring plate body 509 to move up and down is arranged on the upper surface of the box body 1. The ring plates 5091 with different diameters can be moved up and down to be flush with the top of the turntable 501 through the action of the adjusting cylinder 5093, and then the first roller 505 can be squeezed and rolled along the inner wall of the ring plate 5091 during the centrifugal force measurement process, and then the centrifugal force can be converted into an extrusion force acting on the roller 512 at the moment of contact with the roller 512, and then collected by the pressure sensor 511 and transmitted to the control cabinet 2 for real-time display and storage.

[0045] Finally, a center block 513 is fixed at the center of the upper surface of the turntable 501, and an electromagnet 514 is arranged on the side of the center block 513 facing the counterweight 506. The counterweight 506 is also made of iron material, so that before the ring plate body 509 moves up and down, current is first passed through the electromagnet 514 to generate magnetic attraction, thereby attracting the sliding seat 503, the radial connecting rod 504, the first roller 505 and the counterweight 506 to the center of the circle together, avoiding the obstruction of the radial connecting rod 504 and the first roller 505 during the up and down movement of the ring plate body 509. Then, when preparing for testing, the current in the electromagnet 514 can be disconnected.

[0046] Reference Figure 7-10 The specific adjustable belt transmission mechanism 6 includes a rotating wheel 601, a transmission wheel 602 and a transmission belt 603. The rotating wheel 601 is fixedly connected to the power input shaft 3 concentrically, and the transmission wheel 602 is fixedly connected to the speed detection shaft 4 concentrically, and the transmission belt 603 is arranged between the rotating wheel 601 and the transmission wheel 602. A plurality of radial strips 604 are provided in an annular array on the upper and lower surfaces of the rotating wheel 601 and the transmission wheel 602, and then a friction block 605 is provided between each group of radial strips 604 aligned up and down to interact with the transmission belt 603, and the upper and lower ends of the friction block 605 are provided with a limit block 606 to interact with the radial strip 604, and then a radially arranged spring 607 is connected to the outer end of one of the limit blocks 606, and the end of the spring 607 is connected to the radial outer end of the rotating wheel 601 or the transmission wheel 602.

[0047] An adjusting disk 608 is concentrically arranged below the rotating wheel 601 and the transmission wheel 602, and a plurality of wedge-shaped extrusion plates 609 are evenly arranged on the upper surface of the adjusting disk 608. Then, the wedge-shaped extrusion plates 609 penetrate the two radial strips 604 aligned up and down and are arranged to abut against the radial inner end of the friction action block 605. In addition, in order to reduce the friction loss when the wedge-shaped extrusion plates 609 are in extrusion contact with the friction action block 605, a second roller 614 is rotatably arranged at the radial inner end of each friction action block 605, and the wedge-shaped extrusion plates 609 are extruded and acted on the friction action block 605 through the second roller 614.

[0048] A bearing sleeve 610 connected to the power input shaft 3 or the speed detection shaft 4 is arranged at the center of the lower surface of the adjustment disk 608, and then a convex rod 611 is arranged on the outer surface of the bearing sleeve 610. At the same time, a lever arm 612 is rotatably arranged just below the middle point of the connecting line of the rotating wheel 601 and the transmission wheel 602, and the two ends of the lever arm 612 are respectively connected to the convex rod 611 on the corresponding bearing sleeve 610, and a driving member 613 for driving the lever arm 612 to rotate is arranged on the bottom wall of the box body 1. The specific driving member 613 includes a hydraulic telescopic rod rotatably connected to the bottom wall of the box body 1, and the end of the hydraulic telescopic rod is connected to the radial rod on the middle pin 615 of the lever arm 612.

[0049] When the ship main engine speed detection experimental device disclosed in this embodiment 1 detects the speed of the ship main engine, the output shaft of the ship main engine is first connected to the top of the power input shaft 3, and then the power input shaft 3 can be made to rotate synchronously under the input of the ship main engine power, and then the speed detection shaft 4 obtains the speed of the corresponding ratio through the transmission action of the adjustable belt drive mechanism 6.

[0050] During the rotation of the speed detection shaft 4, the centrifugal speed measuring mechanism 5 above it rotates synchronously, so that the sliding seat 503, the radial connecting rod 504, the first roller 505, the counterweight block 506 and the upper counterweight weight 508 can generate centrifugal force. This part of the centrifugal force acts on the inner wall of the ring plate 5091 through the radial extrusion of the first roller 505, and transmits the radial extrusion force to the pressure sensor 511 through the transmission action of the roller 512, and can be equivalently converted into the corresponding centrifugal force through the pressure sensor 511.

[0051] In addition, when the rotation speed of the ship's main engine increases or decreases, the driving member 613 in the adjustable belt transmission mechanism 6 can be started to make the lever arm 612 rotate around the middle fulcrum. At this time, the two adjustment disks 608 on the corresponding rotating wheel 601 or the transmission wheel 602 move away from each other and close to each other. Then, under the action of the wedge-shaped extrusion plate 609 and the spring 607, the diameter of the rotating wheel 601 or the transmission wheel 602 in the actual transmission process can be adjusted, thereby completing the adjustment of the transmission ratio, so that the rotation speed of the ship's main engine can be accurately detected no matter what range it is in.

[0052] Example 2

[0053] This embodiment 2 discloses a speed detection method using the above-mentioned ship main engine speed detection experimental device, including the following steps:

[0054] S1: First, place the ship main engine above the box 1, and connect the power output shaft of the ship main engine with the power input shaft 3;

[0055] S2: According to the main speed range during the stable operation of the ship's main engine, add an appropriate number of counterweights 506 to the sliding seat 503, and calculate and record the total weight of the objects involved in the centrifugal motion, where the total weight of the centrifugal motion object is the total weight of the sliding seat 503, the radial connecting rod 504, the first roller 505, the counterweight 506 and the upper counterweight 508.

[0056] S3: measuring the radial distance from the center point of the sliding seat 503 to the center point of the rotating disk 501 when the first roller 505 abuts against the inner wall of the ring plate 509, and recording it;

[0057] S4: Start the ship main engine, and the turntable 501 rotates under the transmission action of the adjustable belt transmission mechanism 6, and then the first roller 505 rotates and moves to the notch each time to directly transmit the centrifugal force to the roller 512, and then the corresponding centrifugal force is measured by the pressure sensor 511;

[0058] S5: Finally, the total weight of the centrifugal moving object is input into the control cabinet 2 and the radial distance from the center point of the sliding seat 503 to the center of the turntable 501 is measured. Then, the internal control module can accurately calculate the rotation speed of the ship's main engine according to the centrifugal force calculation formula.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ship main engine speed detection experimental device, comprising a box (1) and a control cabinet (2), characterized in that: The bottom walls at both ends of the box (1) are rotatably connected to a vertically arranged power input shaft (3) and a speed detection shaft (4); the power input shaft (3) extends out of the top of the box (1) and is connected to the output shaft of the ship's main engine; a centrifugal speed measuring mechanism (5) is arranged on the top of the speed detection shaft (4); and an adjustable belt transmission mechanism (6) is arranged between the power input shaft (3) and the speed detection shaft (4); The centrifugal speed measuring mechanism (5) comprises a turntable (501) which is fixedly connected to the top of the speed detection shaft (4) concentrically, the upper surface of the turntable (501) is provided with a radial slide rail (502), a sliding seat (503) is slidably provided on the radial slide rail (502), a vertically arranged weight positioning rod (507) is fixed at the center of the upper surface of the sliding seat (503), a plurality of counterweights (508) are inserted on the weight positioning rod (507), a radial connecting rod (504) which is parallel to the radial slide rail (502) is fixedly provided on the sliding seat (503), the outer end of the radial connecting rod (504) is connected to a first roller (505), the inner end of the radial connecting rod (504) is connected to a counterweight block (506), and the sliding seat (503) is provided with a plurality of counterweights (508) inserted on the counterweight positioning rod (507). The center of gravity of the radial connecting rod (504), the first roller (505) and the counterweight (506) is located on the central axis of the weight positioning rod (507); an annular plate body (509) is concentrically arranged on the periphery of the rotating disk (501) and is in contact with the first roller (505); a notch is provided on the outer circumferential surface of the annular plate body (509); a connecting piece (510) is arranged on the annular plate body (509) outside the notch; a pressure sensor (511) is arranged on the side of the connecting piece (510) facing the notch, and the pressure sensor (511) is electrically connected to the control cabinet (2); a roller (512) extending into the notch is connected to the pressure-bearing surface of the pressure sensor (511), and an end of the roller (512) is arranged flush with the inner wall of the annular plate body (509).

2. The ship main engine speed detection experimental device according to claim 1 is characterized in that: An operation opening is provided on the upper surface of the box body (1) located directly above the rotating disk (501), and a box cover (101) is provided in the operation opening.

3. The ship main engine speed detection experimental device according to claim 1 is characterized in that: The ring plate body (509) comprises at least two concentric ring plates (5091) of unequal diameters, and two adjacent ring plates (5091) are connected in sequence up and down to form a stepped arrangement, a vertical guide rod (5092) extending vertically out of the upper surface of the box body (1) is arranged outside the ring plate (5091), and an adjusting cylinder (5093) for driving the entire ring plate body (509) to move up and down is arranged on the upper surface of the box body (1).

4. The ship main engine speed detection experimental device according to claim 3 is characterized in that: A center block (513) is fixed at the center of the upper surface of the rotating disk (501), and an electromagnet (514) is arranged on the side of the center block (513) facing the counterweight block (506), and the counterweight block (506) is made of iron material.

5. The ship main engine speed detection experimental device according to claim 1 is characterized in that: The adjustable belt transmission mechanism (6) comprises a rotating wheel (601), a transmission wheel (602) and a transmission belt (603); the rotating wheel (601) is fixedly connected concentrically with the power input shaft (3); the transmission wheel (602) is fixedly connected concentrically with the speed detection shaft (4); and the transmission belt (603) is arranged between the rotating wheel (601) and the transmission wheel (602); The upper and lower surfaces of the rotating wheel (601) and the transmission wheel (602) are provided with a plurality of radial slots (604) in an annular array, a friction block (605) that interacts with the transmission belt (603) is provided between the upper and lower aligned radial slots (604), and both upper and lower ends of the friction block (605) are provided with limit blocks (606) that interact with the radial slots (604), wherein the outer end of one of the limit blocks (606) is connected to a radially arranged spring (607), and the end of the spring (607) is connected to the radial outer end of the rotating wheel (601) or the transmission wheel (602). , an adjusting disk (608) is concentrically arranged below the rotating wheel (601) and the transmission wheel (602), a plurality of wedge-shaped extrusion plates (609) are evenly arranged on the upper surface of the adjusting disk (608), the wedge-shaped extrusion plates (609) penetrate two radial strips (604) aligned vertically and are arranged in contact with the radial inner end of the friction action block (605), a bearing sleeve (610) connected to the power input shaft (3) or the speed detection shaft (4) is arranged at the center of the lower surface of the adjusting disk (608), and a convex rod (611) is arranged on the outer surface of the bearing sleeve (610); A lever arm (612) is rotatably arranged just below the midpoint of the line connecting the rotating wheel (601) and the transmission wheel (602), the two ends of the lever arm (612) being respectively connected to the convex rods (611) on the corresponding bearing sleeve (610), and a driving member (613) for driving the lever arm (612) to rotate is arranged on the bottom wall of the box body (1).

6. The ship main engine speed detection experimental device according to claim 5 is characterized in that: A second roller (614) is rotatably provided at the radial inner end of each friction action block (605), and the wedge-shaped extrusion plate (609) extrudes and acts on the friction action block (605) through the second roller (614).

7. The ship main engine speed detection experimental device according to claim 5 is characterized in that: The driving member (613) comprises a hydraulic telescopic rod rotatably connected to the bottom wall of the box body (1), and the end of the hydraulic telescopic rod is connected to a radial rod on the middle pin shaft (615) of the lever arm (612).

8. The ship main engine speed detection experimental device according to claim 1 is characterized in that: Two bearing seats (102) are fixed on the bottom walls at both ends of the box body (1); the lower ends of the power input shaft (3) and the speed detection shaft (4) are respectively connected to the corresponding bearing seats (102); a frame plate (103) is fixed to the upper end of the inner wall of the box body (1); and a bearing connected to the upper end of the speed detection shaft (4) is provided at the end of the frame plate (103).

9. The ship main engine speed detection experimental device according to claim 1 is characterized in that: A mounting bracket (7) is fixed to the upper surface of the box body (1) located directly above the power access shaft (3); the ship main engine is temporarily mounted on the mounting bracket (7) and connected to the top end of the power access shaft (3) via a coupling.

10. A method for detecting rotation speed using the ship main engine rotation speed detection experimental device according to any one of claims 1 to 9, characterized in that: The steps include: 1) Arranging the ship main engine above the box (1), and connecting the power output shaft of the ship main engine to the power input shaft (3); 2) according to the speed range of the main engine of the ship during stable operation, add an appropriate number of counterweight blocks (506) to the sliding seat (503), and calculate and record the total weight of the objects involved in the centrifugal motion; 3) measuring the radial distance from the center point of the sliding seat (503) to the center point of the rotating disk (501) when the first roller (505) abuts against the inner wall of the ring plate body (509), and recording the distance; 4) starting the ship's main engine, causing the turntable (501) to rotate under the driving action of the adjustable belt drive mechanism (6), and then each time the first roller (505) rotates and moves to the notch, the centrifugal force is directly transmitted to the roller (512), and the corresponding centrifugal force is then measured by the pressure sensor (511); 5) Finally, the total weight of the centrifugal moving object and the radial distance from the center point of the measuring sliding seat (503) to the center point of the turntable (501) are input into the control cabinet (2), and then the internal control module can accurately calculate the rotation speed of the ship's main engine according to the centrifugal force calculation formula.

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