Ship tail shaft rotating speed detection device

Abstract

The utility model discloses a ship tail shaft rotating speed detection device which comprises a base, a rotating disc, an induction speed measurement device and a contact speed measurement device. The turntable is arranged on the base, is connected with a connecting rod with a stern shaft connecting sleeve, and can drive a stern shaft to rotate; the induction speed measuring device comprises a movable mounting frame, a fixed mounting frame, a rotating speed inductor and an induction control panel; the movable mounting frame is arranged on the turntable and is provided with an induction plate; the fixed mounting frame is arranged on the base and is provided with a rotating speed sensor; the contact speed measuring device comprises a speed measuring display part and a speed measuring shifting block; one end of the speed measurement shifting block extends out of the other end in the speed measurement display part; a speed measuring circuit is arranged in the speed measuring display part; the speed measurement display part and the speed measurement shifting block are respectively provided with a fixed contact block and a movable contact block which are connected to the speed measurement circuit; the movable installation frame is provided with a rotating contact block. The device is simple to use, is less affected by electromagnetic interference, ensures the accuracy of rotation speed detection through two detection modes, and enables the rotation speed correction of the tail shaft to be more accurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of ship auxiliary equipment, and in particular relates to a ship tail shaft speed detection device. Background Art

[0002] In recent years, my country has increased its investment in the research and development of ship technology. At present, my country's shipbuilding technology has ranked among the best in the world. The main power source of a general ship is the engine, which generates thrust through the propeller to propel the ship forward. The speed is an important indicator for monitoring marine engines and a major criterion for judging the navigation status of a ship. The ship is equipped with speed detection devices such as sensors on the engine shaft, that is, the stern shaft, to detect the engine speed. After long-term use, the engine speed detection device will produce deviations. Therefore, the engine speed detection device needs to be calibrated during regular maintenance of the ship. The calibration method is to connect an external speed detection device, compare the measured tail shaft speed with the speed measured by the ship's own detection device, and perform manual calibration if an error occurs.

[0003] Large ships use large special instruments to measure speed and guide calibration, but the engine speed detection and calibration of small and medium-sized ships are different. Due to the narrow position of the stern shaft, traditional speed detection instruments cannot be installed quickly and easily; and traditional tail shaft speed detection equipment uses an electronic simulator to simulate the waveform to achieve stern shaft speed detection. This type of instrument is an electromagnetic precision equipment. Due to the large number of weak current equipment on the ship, there are many interference sources, especially for special ships involving electromagnetic compatibility, which have more interference sources. In this case, the traditional tail shaft speed detection device that relies on analog signals to generate waveforms is prone to interference errors, making the measured tail shaft speed inaccurate, affecting the calibration of the ship's speed measuring device. Utility Model Content

[0004] The purpose of the utility model is to propose a ship tail shaft speed detection device to solve the problems that the external tail shaft speed detection device is difficult to install due to the narrow position when the ship tail shaft speed measuring device is calibrated in the prior art, and the speed measuring device is easily interfered, resulting in inaccurate detection data. The utility model is easy to install, and is less affected by electromagnetic interference. At the same time, it also has a touch-type speed detection to ensure the accuracy of the speed detection, so that the tail shaft speed correction is more accurate.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A ship's tail shaft speed detection device, including a ship's engine and an engine speed detection device that comes with the ship; also includes a base, a turntable, a connecting rod, an inductive speed measuring device and a contact speed measuring device; the turntable is rotatably arranged on the base; one end of the connecting rod is connected to the turntable, and the other end passes through the base; a tail shaft connecting sleeve is provided at the end of the connecting rod; a clamping device is provided on the tail shaft connecting sleeve; a rocker arm is provided at the eccentric position of the turntable; the inductive speed measuring device includes a movable mounting frame, a fixed mounting frame, a speed sensor and an inductive control panel; the movable mounting frame is arranged on the turntable; an inductive plate is provided on the movable mounting frame; the fixed mounting frame is arranged on the base; the speed sensor is movably arranged downward on the fixed mounting frame; the speed sensor The device is connected to the inductive control panel; the inductive control panel is provided with an inductive control system; the contact speed measuring device includes a speed display part and a speed dial block; the speed display part is arranged on the top of the base; one end of the speed dial block is movably arranged in the speed display part, and the other end extends out of the speed display part; a speed measuring circuit is arranged in the speed display part; the speed measuring circuit is connected with corresponding fixed contact blocks and movable contact blocks; the fixed contact blocks and the movable contact blocks are not in contact with each other, and form normally open contacts with each other; the fixed contact block is arranged in the speed display part; the movable contact block is arranged on the speed dial block; the speed display part is provided with a contact control system; the movable mounting frame is provided with a rotating contact block; the speed dial block is located on the movement trajectory of the rotating contact block.

[0007] The engine speed detection device of the ship can detect the speed of the tail shaft of the marine engine and display it on the ship's operating instrument; the base is used to support the device; the connecting rod is connected to the engine tail shaft through the tail shaft connecting sleeve, and rotating the rocker arm can drive the turntable to rotate, so that the connecting rod rotates together with the engine tail shaft; the clamping device can tightly connect the tail shaft connecting sleeve with the tail shaft; the movable mounting frame rotates with the rotation of the turntable, and when it reaches the bottom of the speed sensor, the induction plate is detected by the speed sensor, which means that the turntable has rotated a circle with the tail shaft and transmits the data to the induction control system; the induction control system adds the data detected by the speed sensor to the time for calculation, and the tail shaft speed can be obtained; the speed sensor can use a photoelectric sensor to reduce the influence of electromagnetic interference of the equipment; the speed measuring electric A pulse generating device is connected to the circuit, and the contact control system is provided with a pulse signal receiving module; when the speed measuring dial block is touched by the rotating contact block to produce a swing, so that the movable contact block touches the fixed contact block, the speed measuring circuit is turned on, the pulse generating device sends a pulse signal and is received by the pulse signal receiving module in the contact control system, so as to judge that the tail shaft has rotated one circle, and finally the contact control system calculates the tail shaft speed and displays it on the speed measuring display unit; the contact control system can also calculate the speed of the stern shaft by checking the interval time of the speed measuring current being energized; this device can be powered by a socket or by a battery, as long as it can provide electrical energy; the tops of the fixed contact block and the movable contact block are provided with corresponding inclined surfaces, and the fixed contact block is inclined relative to the movable contact block, so that the inclined surfaces can better contact each other when the movable contact swings quickly.

[0008] As a further technical improvement, one end of the tail shaft connecting sleeve is open, and two sets of corresponding extrusion plates are arranged inside; the extrusion plate is provided with a rubber layer; the tail shaft connecting sleeve is provided with a screw hole, and the screw hole is matched with a tightening bolt. The front half of the tightening bolt is not provided with a thread, so that when the threaded position is screwed into the screw hole, it can drive the extrusion plate to be squeezed inward, and when the front half without a thread is located in the screw hole, the extrusion plate can move freely, so that the tail shaft can be easily pushed in; the rubber layer is deformed when being squeezed, so that the tail shaft connecting sleeve and the tail shaft are more tightly connected; the extrusion plate is semicircular and matches the tail shaft.

[0009] As a further technical improvement, at least two groups of springs are provided between each group of the extrusion plates and the inner wall of the tail shaft connection sleeve; the springs near the entrance of the tail shaft connection sleeve are shorter than the springs near the rear of the tail shaft connection sleeve; the rubber layer is provided with raised particles. The springs can strengthen the extrusion of the tail shaft by the extrusion plates; the springs are shorter at the front and longer at the back, so that the extrusion plates at the entrance of the tail shaft connection sleeve are close to the inner wall of the tail shaft connection sleeve, and the extrusion plates gradually tilt inwards backwards, so that the tail shaft will not be blocked from entering the tail shaft connection sleeve, and the extrusion plates at the rear can better extrude and tighten the tail shaft.

[0010] As a further technical improvement, it also includes a telescopic mounting frame; the fixed mounting frame and the telescopic mounting frame are both provided with adjustment slots; the telescopic mounting frame is movably mounted on the adjustment slot of the fixed mounting frame by means of screws; the speed sensor is movably mounted on the adjustment slot of the telescopic mounting frame. The adjustment slot on the fixed mounting frame is arranged vertically, and the height of the telescopic mounting frame can be adjusted, thereby adjusting the height of the speed sensor; the top of the telescopic mounting frame is bent, so that the adjustment slot on the telescopic mounting frame is horizontal, and the horizontal position of the speed sensor can be adjusted.

[0011] As a further technical improvement, the speed dial block is provided with a hinge; the speed dial block is hinged to the speed display part through the hinge; a return spring is provided at the hinge. After swinging, the speed dial block can return quickly under the action of the return spring.

[0012] As a further technical improvement, a bearing seat is provided in the base; a bearing is provided in the bearing seat; and the connecting rod passes through the base from the bearing.

[0013] As a further technical improvement, a supporting base plate is provided at the bottom of the base, which can make the device more stable.

[0014] As a further technical improvement, the induction control system and the contact control system are both provided with a timing module; the speed display unit and the induction control panel are both provided with a display screen. The timing module is used to record the time taken for the tail shaft to rotate one circle, thereby calculating the speed of the tail shaft; the induction control system and the contact control system are both provided with a calculation module; the display screen is used to display the measured speed of the tail shaft.

[0015] The method of using the above-mentioned ship tail shaft speed detection device is as follows:

[0016] Tail shaft connection: When inspecting a ship, remove the propeller of the engine and insert the connecting sleeve into the engine shaft, i.e., the tail shaft of the ship; at this time, the spring presses the extrusion plate toward the tail shaft; rotate the tightening bolt so that the tightening bolt pushes the extrusion plate toward the center, thereby clamping the tail shaft; the rubber layer on the extrusion plate is deformed, so that the extrusion plate clamps the tail shaft without damaging the tail shaft; the particles on the rubber layer increase friction, making the connection between the tail shaft and the connecting sleeve more secure;

[0017] Inductive speed measurement: Rotate the swing arm to make the turntable drive the movable mounting frame to rotate. When the induction plate on the movable mounting frame rotates to the right below the speed sensor, it is sensed. At this time, stop rotating the turntable, and take the first induction as the starting zero position; then continue to rotate the swing arm, and the turntable drives the movable mounting frame and the induction plate to rotate together, so that each time the induction plate passes under the speed sensor, it is sensed once, which is counted as one circle; when the turntable is rotated, the tail shaft of the ship will also rotate because it is tightly sleeved in the connecting sleeve; the induction control system calculates the speed per unit time according to the number of times the speed sensor senses the induction plate within a period of time, and displays it on the display screen of the control panel;

[0018] Touch speed measurement: When the turntable is rotated, the movable mounting frame drives the rotating contact block to rotate together. When the speed dial block position is reached, the speed dial block is touched, causing the speed dial block to swing, thereby allowing the movable contact block to contact the fixed contact block, so that the speed measurement circuit is turned on. Each time the speed measurement circuit is turned on, it means that the turntable drives the tail shaft to rotate one circle; the contact control system detects the number of times the speed measurement circuit is turned on, thereby obtaining the number of circles the tail shaft has rotated within a period of time, thereby calculating the speed of the tail shaft per unit time and displaying it on the display screen of the speed measurement display unit;

[0019] Comparison and calibration: Compare the speed of the tail shaft detected by the inductive speed measurement and the touch speed measurement. If the error is within a certain range, it means that the inductive speed measurement is accurate, and the data of the inductive speed measurement is used for the tail shaft speed detection calibration; if the error exceeds the range, it means that there is a deviation in the detection of the inductive speed measurement, and this data cannot be used for the tail shaft speed detection calibration. It is necessary to check and eliminate the problem and then perform multiple tests until the difference in the speed of the tail shaft detected by the inductive speed measurement and the touch speed measurement is within an acceptable range. Then the inductive speed measurement data can be used; when performing the tail shaft speed detection calibration, compare the tail shaft speed measured by the ship's own engine speed detection device according to the inductive speed measurement data. If the data are different, manually adjust the tail shaft speed measured by the engine speed detection device to be the same as the inductive speed measurement data to complete the calibration of the ship's tail shaft speed detection.

[0020] The technical solution of the utility model has the following beneficial effects:

[0021] 1. The utility model can easily connect the stern shaft with the speed measuring device through the connecting rod and the stern shaft connecting sleeve, thereby solving the problem that the stern shaft position is narrow and it is difficult to install the stern shaft speed measuring device.

[0022] 2. The utility model obtains the rotation speed of the stern shaft by adopting an external rotation speed sensing device to detect the rotation speed of the turntable that drives the stern shaft to rotate, thereby reducing the influence of the electromagnetic interference of the hull on the detection of the rotation speed of the stern shaft, making the detection of the rotation speed of the stern shaft more accurate.

[0023] 3. The utility model performs double speed measurement through an induction speed measuring device and a contact speed measuring device, thereby avoiding the influence of electromagnetic signal interference of the hull on the stern shaft speed detection, further avoiding the error caused by the stern shaft speed detection, and ensuring the accuracy of the stern shaft speed measurement calibration.

[0024] 4. The tail shaft connecting sleeve of the utility model has a simple structure and is easy to use, and can firmly connect the tail shaft with the connecting rod of the device in a narrow position.

[0025] 5. The speed display part and the speed dial block of the utility model device are connected to the speed measuring circuit in the form of a fixed contact block and a movable contact block, so as to judge the time taken by the turntable to drive the stern shaft to rotate one circle, and calculate the rotation speed of the stern shaft. The structure is ingenious and the anti-interference ability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the overall structural diagram of this device.

[0027] Figure 2 A side view of the device.

[0028] Figure 3 It is a schematic diagram of the structure of the speed display unit and the speed dial block.

[0029] Figure 4 It is a schematic diagram of the structure of the tail shaft connecting sleeve.

[0030] Figure numerals: 1-base, 2-turntable, 3-connecting rod, 4-rocker arm, 5-movable mounting frame, 6-sensing plate, 7-fixed mounting frame, 8-telescopic mounting frame, 9-speed sensor, 10-adjusting slot, 11-speed display part, 12-speed dial block, 13-rotating contact block, 14-tail shaft connecting sleeve, 15-tightening bolt, 16-sensing control panel, 17-fixed contact block, 18-movable contact block, 19-display screen, 20-extrusion plate, 21-rubber layer, 22-particles, 23-spring, 24-hinge, 25-support base plate, 26-tail shaft, 27-bearing seat. DETAILED DESCRIPTION

[0031] The utility model will be further described below in conjunction with the accompanying drawings.

[0032] Embodiment 1:

[0033] like Figures 1 to 4As shown, a ship tail shaft speed detection device includes a ship engine and an engine speed detection device that comes with the ship; it also includes a base 1, a turntable 2, a connecting rod 3, an inductive speed measuring device and a contact speed measuring device; the turntable 2 is rotatably arranged on the base 1; one end of the connecting rod 3 is connected to the turntable 2, and the other end passes through the base 1; a tail shaft connecting sleeve 14 is provided at the end of the connecting rod 3; a clamping device is provided on the tail shaft connecting sleeve 14; a rocker arm 4 is provided at the eccentric position of the turntable 2; the inductive speed measuring device includes a movable mounting frame 5, a fixed mounting frame 7, a speed sensor 9 and an inductive control panel 16; the movable mounting frame 5 is arranged on the turntable 2; a sensing plate 6 is provided on the movable mounting frame 5; the fixed mounting frame 7 is arranged on the base 1; the speed sensor 9 is movably arranged downward on the fixed mounting frame 7; the speed sensor 9 is connected to the inductive control panel 16. control panel 16; an inductive control system is arranged in the inductive control panel 16; the contact speed measuring device comprises a speed display part 11 and a speed dial block 12; the speed display part 11 is arranged on the top of the base 1; one end of the speed dial block 12 is movably arranged in the speed display part 11, and the other end extends out of the speed display part 11; a speed measuring circuit is arranged in the speed display part 11; the speed measuring circuit is connected with corresponding fixed contact blocks 17 and movable contact blocks 18; the fixed contact blocks 17 and movable contact blocks 18 are not in contact with each other, and form normally open contacts with each other; the fixed contact block 17 is arranged in the speed display part 11; the movable contact block 18 is arranged on the speed dial block 12; a contact control system is arranged in the speed display part 11; a rotating contact block 13 is arranged on the movable mounting frame 5; the speed dial block 12 is located on the movement trajectory of the rotating contact block 13.

[0034] The tail shaft connecting sleeve 14 is open at one end, and two groups of corresponding extrusion plates 20 are arranged inside; a rubber layer 21 is arranged on the extrusion plate 20; the tail shaft connecting sleeve 14 is provided with screw holes, and the screw holes are matched with tightening bolts 15.

[0035] At least two groups of springs 23 are arranged between each group of the extrusion plates 20 and the inner wall of the tail shaft connecting sleeve 14; the springs 23 near the entrance of the tail shaft connecting sleeve 14 are shorter than the springs 23 near the rear of the tail shaft connecting sleeve 14; and raised particles 22 are arranged on the rubber layer 21.

[0036] It also includes a telescopic mounting frame 8; both the fixed mounting frame 7 and the telescopic mounting frame 8 are provided with an adjustment slot 10; the telescopic mounting frame 8 is movably arranged on the adjustment slot 10 of the fixed mounting frame 7 by means of screws; the speed sensor 9 is movably arranged on the adjustment slot 10 of the telescopic mounting frame 8.

[0037] The speed measuring dial block 12 is provided with a hinge 24 ; the speed measuring dial block 12 is hingedly connected to the speed measuring display part 11 via the hinge 24 ; and a return spring is provided at the hinge 24 .

[0038] The induction control system and the contact control system are both provided with a timing module; the speed measurement display unit 11 and the induction control panel 16 are both provided with a display screen 19 .

[0039] The method of using the utility model is as follows:

[0040] Tail shaft connection: When the ship is overhauled, the propeller of the engine is removed and the connecting sleeve 14 is inserted into the engine shaft, that is, the ship's tail shaft 26; at this time, the spring 23 presses the extrusion plate 20 toward the tail shaft 26; the tightening bolt 15 is rotated so that the tightening bolt 15 pushes the extrusion plate 20 toward the center, thereby clamping the tail shaft 26; the rubber layer 21 on the extrusion plate 20 is deformed so that the extrusion plate 20 clamps the tail shaft 26 without damaging the tail shaft 26; the particles 22 on the rubber layer 21 increase friction, so that the tail shaft 26 is more firmly connected to the connecting sleeve 14;

[0041] Inductive speed measurement: Rotate the rocker arm 4, so that the turntable 2 drives the movable mounting frame 5 to rotate. When the induction plate 6 on the movable mounting frame 5 rotates to the right below the speed sensor 9, it is sensed. At this time, the turntable 2 stops rotating, and the first induction is taken as the starting zero position; then continue to rotate the rocker arm 4, and the turntable drives the movable mounting frame 5 to rotate together with the induction plate 6, so that each time the induction plate 6 passes under the speed sensor 9, it is sensed once, which is counted as one circle; when the turntable 2 is rotated, the tail shaft 26 of the ship will also rotate together because it is tightly sleeved in the connecting sleeve 14; the induction control system calculates the speed per unit time according to the number of times the speed sensor 9 senses the induction plate 6 within a period of time, and displays it on the display screen 19 of the control panel 16;

[0042] Touch speed measurement: When the turntable 2 is rotated, the movable mounting frame 5 drives the rotating contact block 13 to rotate together. When the position of the speed measuring dial block 12 is reached, the speed measuring dial block 12 is touched, so that the speed measuring dial block 12 swings, thereby making the movable contact block 18 contact the fixed contact block 17, so that the speed measuring circuit is turned on. Each time the speed measuring circuit is turned on, it means that the turntable 2 drives the tail shaft 26 to rotate one circle; the contact control system detects the number of times the speed measuring circuit is turned on, so as to obtain the number of circles the tail shaft 26 rotates within a period of time, thereby calculating the speed of the tail shaft 26 per unit time and displaying it on the display screen of the speed measuring display unit 11;

[0043] Comparison and calibration: Compare the rotation speeds of the tail shaft 26 detected by the inductive speed measurement and the touch speed measurement. If the error is within a certain range, it means that the inductive speed measurement is accurate, and the data of the inductive speed measurement is selected for the tail shaft speed detection calibration; if the error exceeds the range, it means that there is a deviation in the detection of the inductive speed measurement, and this data cannot be used for the tail shaft 26 speed detection calibration. It is necessary to check and eliminate the problem and perform multiple tests until the speed difference of the tail shaft 26 detected by the inductive speed measurement and the touch speed measurement is within an acceptable range. Then the inductive speed measurement data can be used; when performing the tail shaft 26 speed detection calibration, compare the speed of the tail shaft 26 measured by the ship's own engine speed detection device according to the inductive speed measurement data. If the data are different, manually adjust the speed of the tail shaft 26 measured by the engine speed detection device to be the same as the inductive speed measurement data to complete the calibration of the ship's tail shaft 26 speed detection.

[0044] Embodiment 2:

[0045] The difference between this embodiment and the first embodiment is that: a bearing seat 27 is provided in the base 1; a bearing is provided in the bearing seat 27; and the connecting rod 3 passes through the base 1 from the bearing.

[0046] The method of use of this embodiment is the same as that of the first embodiment.

[0047] Embodiment three:

[0048] The difference between this embodiment and the second embodiment is that a supporting bottom plate 25 is provided at the bottom of the base 1 .

[0049] The method of use of this embodiment is the same as that of the first embodiment.

[0050] Embodiment 4:

[0051] The difference between this embodiment and the third embodiment is that: a bearing seat 27 is provided in the base 1; a bearing is provided in the bearing seat 27; and the connecting rod 3 passes through the base 1 from the bearing. A supporting bottom plate 25 is provided at the bottom of the base 1.

[0052] The method of use of this embodiment is the same as that of the first embodiment.

[0053] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Personnel in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

[0054] In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "inside", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0055] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A ship tail shaft speed detection device, comprising a ship engine and a ship's own engine speed detection device; characterized in that: It also comprises a base (1), a turntable (2), a connecting rod (3), an inductive speed measuring device and a contact speed measuring device; the turntable (2) is rotatably arranged on the base (1); one end of the connecting rod (3) is connected to the turntable (2), and the other end passes through the base (1); a tail shaft connecting sleeve (14) is provided at the end of the connecting rod (3); a clamping device is provided on the tail shaft connecting sleeve (14); a rocker arm (4) is provided at an eccentric position of the turntable (2); The inductive speed measuring device comprises a movable mounting frame (5), a fixed mounting frame (7), a rotation speed sensor (9) and an inductive control panel (16); the movable mounting frame (5) is arranged on a turntable (2); an inductive plate (6) is arranged on the movable mounting frame (5); the fixed mounting frame (7) is arranged on a base (1); the rotation speed sensor (9) is movably arranged downward on the fixed mounting frame (7); the rotation speed sensor (9) is connected to the inductive control panel (16); and an inductive control system is arranged in the inductive control panel (16); The contact speed measuring device comprises a speed measuring display part (11) and a speed measuring dial block (12); the speed measuring display part (11) is arranged on the top of the base (1); one end of the speed measuring dial block (12) is movably arranged in the speed measuring display part (11), and the other end extends out of the speed measuring display part (11); a speed measuring circuit is arranged in the speed measuring display part (11); the speed measuring circuit is connected to a fixed contact block (17) and a movable contact block (18) corresponding to each other; the fixed contact block (17) and the movable contact block (18) are not in contact with each other and form a normally open contact with each other; the fixed contact block (17) is arranged in the speed measuring display part (11); the movable contact block (18) is arranged on the speed measuring dial block (12); a contact control system is arranged in the speed measuring display part (11); a rotating contact block (13) is arranged on the movable mounting frame (5); and the speed measuring dial block (12) is located on the movement track of the rotating contact block (13).

2. The ship tail shaft speed detection device according to claim 1, characterized in that: One end of the tail shaft connecting sleeve (14) is open, and two groups of corresponding extrusion plates (20) are arranged inside; a rubber layer (21) is arranged on the extrusion plate (20); a screw hole is arranged on the tail shaft connecting sleeve (14), and a tightening bolt (15) is matched with the screw hole.

3. The ship tail shaft speed detection device according to claim 2, characterized in that: At least two groups of springs (23) are provided between each group of the extrusion plates (20) and the inner wall of the tail shaft connecting sleeve (14); the springs (23) close to the entrance of the tail shaft connecting sleeve (14) are shorter than the springs (23) close to the rear of the tail shaft connecting sleeve (14); and raised particles (22) are provided on the rubber layer (21).

4. The ship tail shaft speed detection device according to claim 1, characterized in that: It also includes a telescopic mounting frame (8); the fixed mounting frame (7) and the telescopic mounting frame (8) are both provided with an adjustment slot (10); the telescopic mounting frame (8) is movably arranged on the adjustment slot (10) of the fixed mounting frame (7) by means of screws; and the speed sensor (9) is movably arranged on the adjustment slot (10) of the telescopic mounting frame (8).

5. The ship tail shaft speed detection device according to claim 1, characterized in that: The speed measuring dial block (12) is provided with a hinge (24); the speed measuring dial block (12) is hingedly connected to the speed measuring display part (11) via the hinge (24); and a return spring is provided at the hinge (24).

6. The ship tail shaft speed detection device according to claim 1, characterized in that: A bearing seat (27) is provided in the base (1); a bearing is provided in the bearing seat (27); and the connecting rod (3) passes through the base (1) from the bearing.

7. The ship tail shaft speed detection device according to claim 1, characterized in that: A supporting bottom plate (25) is provided at the bottom of the base (1).

8. The ship tail shaft speed detection device according to claim 1, characterized in that: The induction control system and the contact control system are both provided with a timing module; the speed measurement display part (11) and the induction control panel (16) are both provided with a display screen (19).

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