A testing device for ship drive blades

Abstract

The present invention discloses a testing device for ship drive blades, which relates to the field of testing technology; in order to solve the efficiency problem; specifically includes a test pool and a water reservoir, the top outer wall of the test pool is fixedly installed with a gantry, the bottom of the gantry is slidably matched with a lifting seat through a guide rod, the bottom of the lifting seat is provided with a connecting frame, and one side of the connecting frame is provided with a mounting mechanism for fixing the blade; the mounting mechanism includes a support tube and an end cover fixedly installed on the end face of the support tube. The present invention uses a plurality of external expansion plates to clamp the blades, so that the blades can be fixed and disassembled by only pushing and pulling the pull rod, which increases the convenience of use and improves the efficiency, and uses the synchronous motion characteristics of the sliding rod, the rotating frame and the connecting rod to make the external expansion plates move synchronously, thereby ensuring the coaxiality of the blades and the mounting mechanism, thereby preventing eccentric vibration during high-speed rotation.

Description

Technical Field

[0001] The invention relates to the field of testing technology, and in particular to a testing device for ship drive blades. Background Art

[0002] The drive blades are an important component of the ship's power system. They are driven by a motor and use the reaction force of the displacement during rotation to provide driving force for the ship. After the production of the drive blades, their performance needs to be tested. That is, the relationship between the blade rotation speed and the propulsion force generated is obtained through testing, which facilitates the calibration and control of the ship's driving force during use.

[0003] After searching, the Chinese patent publication number CN111006862B discloses a ship propulsion blade power testing device, including a fuselage, a propulsion chamber with an opening to the left is provided at the left end of the fuselage, a clamping mechanism for clamping fan blades for testing is provided in the propulsion chamber, a starting mechanism for starting the test is provided at the upper end of the fuselage, and a display mechanism for displaying the test results is provided at the right end of the fuselage; the starting mechanism includes a movable chamber located on the upper cavity wall of the propulsion chamber and opening downward, a push block cavity with an opening to the left is provided on the right cavity wall of the movable cavity, a push block that can move left and right in the cavity is provided in the push block cavity, and a reset spring connected to the right cavity wall of the push block cavity is fixedly provided on the right end face of the push block.

[0004] The above patent has the following shortcomings: it uses the blade's own flange to connect with the device, and the bolts need to be tightened and loosened during the installation and disassembly process, which makes it impossible to achieve quick installation and disassembly, resulting in low testing efficiency.

[0005] To this end, the present invention provides a testing device for ship drive blades. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a testing device for ship drive blades.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A testing device for ship drive blades, comprising a testing tank and a water storage tank.

[0009] A gantry is fixedly installed on the top outer wall of the test tank, a lifting seat is slidably matched with the bottom of the gantry through a guide rod, a connecting frame is arranged at the bottom of the lifting seat, and a mounting mechanism for fixing the blade is arranged on one side of the connecting frame;

[0010] The mounting mechanism comprises a support tube and an end cover fixedly mounted on the end surface of the support tube, the support tube is radially slidably connected with at least three groups of circular arrays of external expansion plates, the inner end surface of the support tube is fixed with a fixing rod, and the inner wall of the end cover is slidably matched with a pull rod;

[0011] A fixing ear is welded to the side wall of the fixing rod, and a rotating frame is rotatably connected to the inner side of the fixing ear. A sliding rod is rotatably connected to the top of the rotating frame, and the other end of the sliding rod is rotatably connected to the inner side wall of the outer expansion plate. The other end of the rotating frame is rotatably connected to a connecting rod, and the other end of the connecting rod is rotatably connected to the end of the pull rod.

[0012] Preferably: a limit plate is fixedly mounted on the end surface of the pull rod, and a spring 1 is buckled on the side opposite to the limit plate and the end cover.

[0013] Furthermore, the rotating frame is arranged in an "L" shape, and the length of the rotating frame connected to the sliding rod is smaller than the length of the rotating frame connected to the connecting rod.

[0014] On the basis of the above scheme: the support tube is rotatably connected to the bottom of the connecting frame, and a motor is fixedly installed on the side wall of the connecting frame, and the output shaft of the motor is matched with the outer wall of the support tube through a synchronous belt drive.

[0015] A better solution in the above solution is that the connecting frame is rotatably connected to the lifting seat via a rotating shaft, and a pressure sensor is fixedly clamped on the side wall of the lifting seat, and the sensing end of the pressure sensor contacts and cooperates with the side wall of the connecting frame.

[0016] As a further solution of the present invention: a telescope is fixedly installed on the top outer wall of the gantry, and the telescopic end of the telescope is fixedly installed on the top outer wall of the lifting seat; when the telescope is extended or retracted, the lifting seat can be driven to rise or fall.

[0017] At the same time, the side walls of the test pool in the length direction are connected to the water reservoir through a return pipe, and the side walls of the test pool in the width direction are respectively fixed and connected with a water inlet pipe and a connecting pipe, the other end of the water inlet pipe is fixed and connected to the side wall of the water reservoir, and the other end of the connecting pipe is fixed and connected to the side wall of the water inlet pipe, and the length direction of the test pool is the driving direction of the water flow by the rotation of the blades.

[0018] As a preferred embodiment of the present invention: the gantry and the top of one of the guide rods are provided with the same group of sensing mechanisms, the sensing mechanism includes a support plate fixed to the outer wall of the top of one of the guide rods, a fixing ring fixed to the outer wall of the top of the gantry, and a cylinder body welded and connected to the side wall of the fixing ring, a conductive resistor spring is fixed to the inner wall of the fixing ring, a conductive plunger is fixedly embedded in the inner wall of the support plate, and the conductive plunger and the conductive resistor spring are connected in series to the power supply circuit of the motor.

[0019] At the same time, the inner wall of the cylinder body is slidably matched with a piston, the end face of the cylinder body is fixedly embedded with a push-type signal switch, the shell part of the push-type signal switch is welded with a second spring, and the other end of the second spring contacts and matches the end face of the piston.

[0020] As a better solution of the present invention: a limiting assembly is provided on the side wall of the piston, and the limiting assembly includes an arc head limiting block slidably connected to the inner wall of the cylinder body and an adjusting bolt threadedly connected to the side wall of the cylinder body, the end of the adjusting bolt is rotatably connected to the limiting slide plate, and the limiting slide plate is connected to the arc head limiting block through spring three.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention utilizes a plurality of external expansion plates to clamp and fix the blades, so that the blades can be fixed and removed only by pushing and pulling the pull rod, which increases the convenience of use and improves efficiency. In addition, the synchronous movement characteristics of the slide rod, the rotating frame and the connecting rod can make the external expansion plates move synchronously, thereby ensuring the coaxiality of the blades and the mounting mechanism, thereby preventing eccentric vibration during high-speed rotation.

[0023] 2. The present invention, through targeted design of the drive of the external expansion plate, utilizes the angle design of the connecting rod to play a force-increasing role, then utilizes the position of the rotating frame and the sliding rod to realize torque amplification, and then utilizes the sliding rod to increase the force, thereby realizing a triple force-increasing function, increasing the stability of the fixation, reducing the force of the pull rod movement, and further increasing the convenience of use.

[0024] 3. The present invention converts the applied force into torque and then into pressure, and then utilizes the changes of the force arm and the torque arm during the conversion process, thereby achieving a proportional amplification of the measurement result and the actual force, thereby increasing the measurement accuracy.

[0025] 4. The present invention can realize water circulation by setting up a test pool and a water reservoir. On the one hand, the water reservoir is used as a transition to absorb the kinetic energy of the water, so that the water contacts the blades in a state of relatively low kinetic energy, thereby increasing the test accuracy. On the other hand, the water enters the blades in a driving direction perpendicular to the blades, so that when the water flow contacts the blades, there is no force along the force direction of the blades, thereby further increasing the test accuracy.

[0026] 5. The present invention, by setting up an induction mechanism, realizes the "switch" effect through the cooperation of the conductive plunger and the conductive resistance spring, so that the motor can be turned on when it is in the test state, and turned off otherwise. On the one hand, the automatic control function is achieved, and on the other hand, the safety hazard caused by the high-speed rotation of the blades before entering the test pool can be prevented, and energy saving can also be achieved.

[0027] 6. The present invention uses a conductive plunger and a conductive resistor spring to control the motor switch, utilizes the Joule effect of the conductive resistor spring to heat the gas in the fixed ring cavity, and combines the signal of the push-type signal switch to achieve a timing function, so that it can automatically rise and reset after the test time is reached, thereby increasing the degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of a testing device for ship drive blades proposed by the present invention;

[0029] Figure 2 A schematic diagram of the structure of a test pool of a test device for ship drive blades proposed by the present invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of a mounting mechanism of a testing device for ship drive blades proposed by the present invention;

[0031] Figure 4 This is a schematic diagram of the enlarged structure of part A of a testing device for ship drive blades proposed by the present invention;

[0032] Figure 5 A partial cross-sectional structural schematic diagram of a testing device for ship drive blades proposed by the present invention;

[0033] Figure 6 This is a schematic diagram of the motor installation structure of a testing device for ship drive blades proposed by the present invention;

[0034] Figure 7 This is a schematic cross-sectional structural diagram of a sensing mechanism of a testing device for ship drive blades proposed by the present invention;

[0035] Figure 8 This is a schematic diagram of the enlarged structure of part B of a testing device for ship drive blades proposed by the present invention;

[0036] Fig. 9 The present invention is a schematic diagram of the circuit structure of a testing device for ship drive blades.

[0037] In the figure: 1-test pool, 2-reflux pipe, 3-water reservoir, 4-water inlet pipe, 5-connecting pipe, 6-rotating shaft, 7-lifting seat, 8-guide rod, 9-gantry, 10-telescope, 11-sensing mechanism, 12-installation mechanism, 13-connecting frame, 14-external expansion plate, 15-end cover, 16-limiting plate, 17-spring one, 18-pull rod, 19-fixing rod, 20-support cylinder, 21-slide rod, 22-rotating frame, 23-connecting rod, 24-fixing ear, 25-pressure sensor, 26-synchronous belt, 27-motor, 28-support plate, 29-fixing ring, 30-conductive plunger, 31-press signal switch, 32-spring two, 33-cylinder body, 34-piston, 35-conductive resistance spring, 36-arc head limit block, 37-spring three, 38-limiting slide plate, 39-adjusting bolt. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] Embodiment 1:

[0041] A testing device for ship drive blades, such as Figures 1 to 9 As shown, it includes a test pool 1 and a water reservoir 3. The top outer wall of the test pool 1 is fixed with a gantry 9 by bolts. The bottom of the gantry 9 is slidably matched with a lifting seat 7 through a guide rod 8. A connecting frame 13 is arranged at the bottom of the lifting seat 7. A mounting mechanism 12 for fixing the blades is arranged on one side of the connecting frame 13.

[0042] The mounting mechanism 12 includes a support tube 20 and an end cover 15 fixed to the end face of the support tube 20 by bolts. The support tube 20 is radially slidably connected with at least three groups of circular arrays of external expansion plates 14. A fixing rod 19 is fixed to the inner end face of the support tube 20, and a pull rod 18 is slidably fitted to the inner wall of the end cover 15.

[0043] A fixing ear 24 is welded to the side wall of the fixing rod 19, and a rotating frame 22 is rotatably connected to the inner side of the fixing ear 24. A sliding rod 21 is rotatably connected to the top of the rotating frame 22. The other end of the sliding rod 21 is rotatably connected to the inner wall of the outer expansion plate 14. The other end of the rotating frame 22 is rotatably connected to a connecting rod 23, and the other end of the connecting rod 23 is rotatably connected to the end of the pull rod 18.

[0044] The end surface of the pull rod 18 is fixed with a limit plate 16 by bolts, and a spring 17 is buckled on the opposite side of the limit plate 16 and the end cover 15.

[0045] When in use, the blades can be placed on the outside of the outer expansion plate 14, and the pull rod 18 is pushed, thereby driving the rotating frame 22 to rotate through the connecting rod 23, and then the outer expansion plate 14 is pushed outward through the sliding rod 21, and the blades are fixed by multiple outer expansion plates 14.

[0046] The device utilizes a plurality of external expansion plates 14 to clamp and fix the blades, so that the blades can be fixed and removed only by pushing and pulling the pull rod 18, which increases the convenience of use and improves efficiency. In addition, the synchronous movement characteristics of the slide bar 21, the rotating frame 22 and the connecting rod 23 can make the external expansion plates 14 move synchronously, thereby ensuring the coaxiality of the blades and the mounting mechanism 12, thereby preventing eccentric vibration during high-speed rotation.

[0047] The rotating frame 22 is arranged in an “L” shape, and the length of the connecting side of the rotating frame 22 and the sliding rod 21 is smaller than the length of the connecting side of the rotating frame 22 and the connecting rod 23 .

[0048] This device, through targeted design of the drive of the external expansion plate 14, utilizes the angle design of the connecting rod 23 to play a force-increasing role, and then utilizes the position of the rotating frame 22 and the sliding rod 21 to realize torque amplification, and then utilizes the sliding rod 21 to increase the force, thereby realizing a triple force-increasing function, increasing the stability of the fixation and reducing the force of the movement of the pull rod 18, and further increasing the convenience of use.

[0049] To solve driver problems, such as Figure 6 As shown, the support tube 20 is rotatably connected to the bottom of the connecting frame 13, and the side wall of the connecting frame 13 is fixed with a motor 27 by bolts, and the output shaft of the motor 27 is matched with the outer wall of the support tube 20 through a synchronous belt 26; when the motor 27 is started, the support tube 20 can be driven to rotate through the synchronous belt 26, thereby driving the blades to rotate.

[0050] In order to solve the problem of sensing accuracy; Figure 5 As shown, the connecting frame 13 is rotatably connected to the lifting seat 7 through the rotating shaft 6, and the side wall of the lifting seat 7 is fixedly clamped with a pressure sensor 25, and the sensing end of the pressure sensor 25 contacts and cooperates with the side wall of the connecting frame 13; when the blade rotates, it has an action force on the water flow, so that it itself is subjected to a reaction force, and the magnitude of the reaction force is the same as the magnitude of the propulsion force generated during actual use, so that the reaction force is applied to the connecting frame 13, so that the connecting frame 13 generates a rotational torque, and then the magnitude of the propulsion force can be measured through the pressure reading of the pressure sensor 25.

[0051] The device converts the applied force into torque and then into pressure, and then utilizes the changes of the force arm and the torque arm during the conversion process, thereby achieving a proportional amplification of the measurement result and the actual force, thereby increasing the measurement accuracy.

[0052] In order to solve the lifting control problem, such as Figure 2 As shown, a telescope 10 is fixed to the top outer wall of the gantry 9 by bolts, and the telescopic end of the telescope 10 is fixed to the top outer wall of the lifting seat 7 by bolts; when the telescope 10 is extended or retracted, the lifting seat 7 can be driven to rise or fall.

[0053] In order to solve the test accuracy problem, such as Figure 1 As shown, the side wall of the test pool 1 in the length direction is connected to the water reservoir 3 through the return pipe 2, and the side walls of the test pool 1 in the width direction are respectively fixed and connected with the water inlet pipe 4 and the connecting pipe 5, the other end of the water inlet pipe 4 is fixed and connected to the side wall of the water reservoir 3, and the other end of the connecting pipe 5 is fixed and connected to the side wall of the water inlet pipe 4, and the length direction of the test pool 1 is the driving direction of the water flow by the rotation of the blades.

[0054] This device can realize water circulation by setting up a test pool 1 and a water reservoir 3. On the one hand, the water reservoir 3 is used as a transition to absorb the kinetic energy of the water, so that the water contacts the blades in a state of relatively low kinetic energy, thereby increasing the test accuracy. On the other hand, the water enters the blades in a driving direction perpendicular to the blades, so that when the water flow contacts the blades, there is no force along the force direction of the blades, thereby further increasing the test accuracy.

[0055] When the present embodiment is in use, the limit plate 16 can be pulled by hand so that the pull rod 18 moves outward and the blade is sleeved on the outside of the support tube 20. Then the limit plate 16 is released and the pull rod 18 is driven to move inward by the pulling force of the spring 17. Then the rotating frame 22 is driven to rotate through the connecting rod 23 and then driven to rotate through the sliding rod 21 to push the outer expansion plate 14 outward to contact and clamp the blade. Then the lifting seat 7 is driven down through the telescopic device 10 to place the blade in the test pool 1. Then the motor 27 is started and the support tube 20 is driven to rotate through the synchronous belt 26, thereby driving the blade to rotate. The blade applies a force to the water flow and the blade itself is subjected to a reaction force, thereby applying a torque to the connecting frame 13. Then the torque can be determined by the reading of the pressure sensor 25. Then the driving force generated by the blade is determined. Combined with the rotation speed applied by the motor 27 to the blade, the relationship between the rotation speed and the propulsion force can be obtained.

[0056] Embodiment 2:

[0057] A testing device for ship drive blades, such as Figure 1 , 8As shown in 9, in order to solve the automation problem; this embodiment makes the following improvements on the basis of embodiment 1: the gantry 9 and the top of one of the guide rods 8 are provided with the same set of sensing mechanisms 11, and the sensing mechanisms 11 include a support plate 28 fixed to the outer wall of the top of one of the guide rods 8, a fixing ring 29 fixed to the outer wall of the top of the gantry 9, and a cylinder body 33 welded and connected to the side wall of the fixing ring 29, a conductive resistor spring 35 is fixed to the inner wall of the fixing ring 29, and a conductive plunger 30 is fixedly embedded in the inner wall of the support plate 28, and the conductive plunger 30 and the conductive resistor spring 35 are connected in series to the power supply circuit of the motor 27.

[0058] When not in the test state, the guide rod 8 is above the gantry 9, at which time the conductive plunger 30 is not in contact with the conductive resistor spring 35, and the motor 27 is turned off. When in the test state, the guide rod 8 is relatively below the gantry 9, at which time the conductive plunger 30 is inserted into the fixing ring 29 and in contact with the conductive resistor spring 35, thereby connecting the power supply circuit of the motor 27 and starting the motor 27.

[0059] The device, by setting up the induction mechanism 11, realizes the "switch" function through the cooperation of the conductive plunger 30 and the conductive resistance spring 35, so that the motor 27 can be turned on when it is in the test state, and turned off otherwise. On the one hand, it can achieve the automatic control function, and on the other hand, it can also prevent the safety hazard caused by the high-speed rotation of the blades before entering the test pool 1, and also achieve energy saving effect.

[0060] To further solve automation problems, such as Figure 8 , 9 As shown, the inner wall of the cylinder body 33 is slidably fitted with a piston 34, the end face of the cylinder body 33 is fixedly embedded with a push-type signal switch 31, the shell part of the push-type signal switch 31 is welded with a spring 2 32, and the other end of the spring 2 32 contacts and fits with the end face of the piston 34.

[0061] A limiting assembly is provided on the side wall of the piston 34, and the limiting assembly includes an arc head limiting block 36 slidably connected to the inner wall of the cylinder body 33 and an adjusting bolt 39 threadedly connected to the side wall of the cylinder body 33, and the end of the adjusting bolt 39 is rotatably connected to a limiting slide 38, and the limiting slide 38 is connected to the arc head limiting block 36 through a spring 37.

[0062] Since the time required for the test process is certain, when the device is used, when the motor 27 is working, there will also be current in the conductive resistance spring 35, thereby generating heat by the Joule effect, heating the fixed ring 29 and the gas in the inner cavity of the cylinder 33. The gas expands due to the heat, and the pressure in the inner cavity of the fixed ring 29 gradually increases until the time required for the test is reached. The pressure on the piston 34 overcomes the resistance of the limit assembly and the spring 2 32 to it and moves, thereby contacting and pressing the push-type signal switch 31, generating an electrical signal, and controlling the telescope 10 to rise. When rising, the conductive plunger 30 rises relative to the fixed ring 29, and the hot air in the inner cavity of the fixed ring 29 exchanges heat with the outside air to cool down. At this time, the elastic force of the spring 2 32 on the piston 34 is greater than the resistance of the limit assembly to the piston 34, and the piston 34 rebounds and resets.

[0063] The device realizes a timing function by utilizing the Joule effect of the conductive resistor spring 35 to heat the gas in the inner cavity of the fixing ring 29 based on the use of the conductive plunger 30 and the conductive resistor spring 35 to control the switch of the motor 27, and then combining the signal of the push-type signal switch 31, so that the timing function can be realized, so that the timing function can be automatically reset after the test time is reached, thereby increasing the degree of automation.

[0064] When the present embodiment is in use, when it is not in the test state, the guide rod 8 is above the gantry 9, at which time the conductive plunger 30 is not in contact with the conductive resistor spring 35, and the motor 27 is turned off. When it is in the test state, the guide rod 8 is relatively below the gantry 9, at which time the conductive plunger 30 is inserted into the interior of the fixing ring 29 and contacts the conductive resistor spring 35, so that the power supply circuit of the motor 27 is connected, the motor 27 is started, and when the motor 27 is working, there will also be current in the conductive resistor spring 35, so that the Joule effect is used to generate heat to heat the fixing ring 29 to The gas in the inner cavity of the cylinder 33 expands due to heat, and the pressure in the inner cavity of the fixed ring 29 gradually increases until the time required for the test is reached. The pressure on the piston 34 overcomes the resistance of the limit assembly and the spring 2 32 to it and moves, thereby contacting and pressing the push-type signal switch 31 to generate an electrical signal to control the expansion joint 10 to rise. During the rise, the conductive plunger 30 rises relative to the fixed ring 29, and the hot air in the inner cavity of the fixed ring 29 exchanges heat with the outside air to cool down. At this time, the elastic force of the spring 2 32 on the piston 34 is greater than the resistance of the limit assembly to the piston 34, and the piston 34 rebounds and resets.

[0065] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A testing device for ship drive blades, comprising a test tank (1) and a water storage tank (3), characterized in that: A gantry (9) is fixedly mounted on the top outer wall of the test pool (1); a lifting seat (7) is slidably matched at the bottom of the gantry (9) via a guide rod (8); a connecting frame (13) is arranged at the bottom of the lifting seat (7); and a mounting mechanism (12) for fixing the blade is arranged on one side of the connecting frame (13); The mounting mechanism (12) comprises a support tube (20) and an end cover (15) fixedly mounted on the end surface of the support tube (20); the support tube (20) is radially slidably connected to at least three groups of circular arrays of external expansion plates (14); a fixing rod (19) is fixed to the inner end surface of the support tube (20); and a pull rod (18) is slidably engaged with the inner wall of the end cover (15); A fixing ear (24) is welded to the side wall of the fixing rod (19); the inner side of the fixing ear (24) is rotatably connected to a rotating frame (22); the top of the rotating frame (22) is rotatably connected to a sliding rod (21); the other end of the sliding rod (21) is rotatably connected to the inner side wall of the outer expansion plate (14); the other end of the rotating frame (22) is rotatably connected to a connecting rod (23); the other end of the connecting rod (23) is rotatably connected to the end of the pull rod (18); The rotating frame (22) is arranged in an "L" shape, and the length of the connecting side of the rotating frame (22) and the sliding rod (21) is shorter than the length of the connecting side of the rotating frame (22) and the connecting rod (23); The bending part of the rotating frame (22) is rotatably connected to the fixing ear (24).

2. A testing device for ship drive blades according to claim 1, characterized in that: A limit plate (16) is fixedly mounted on the end surface of the pull rod (18), and a spring 1 (17) is buckled on the side of the limit plate (16) opposite to the end cover (15).

3. A testing device for ship drive blades according to claim 1, characterized in that: The support tube (20) is rotatably connected to the bottom of the connecting frame (13), and a motor (27) is fixedly mounted on the side wall of the connecting frame (13), and the output shaft of the motor (27) is driven and matched with the outer wall of the support tube (20) through a synchronous belt (26).

4. A testing device for ship drive blades according to claim 1, characterized in that: The connecting frame (13) is rotatably connected to the lifting seat (7) via a rotating shaft (6), and a pressure sensor (25) is fixedly clamped on the side wall of the lifting seat (7), and the sensing end of the pressure sensor (25) contacts and fits with the side wall of the connecting frame (13).

5. The testing device for ship drive blades according to claim 1, characterized in that: A telescope (10) is fixedly mounted on the top outer wall of the gantry (9), and the telescopic end of the telescope (10) is fixedly mounted on the top outer wall of the lifting seat (7); when the telescope (10) is extended or retracted, the lifting seat (7) can be driven to rise or fall.

6. A testing device for ship drive blades according to claim 1, characterized in that: The side wall of the test pool (1) in the length direction is connected to the water storage tank (3) through the return pipe (2); the side wall of the test pool (1) in the width direction is respectively fixed with and connected to a water inlet pipe (4) and a connecting pipe (5); the other end of the water inlet pipe (4) is fixed and connected to the side wall of the water storage tank (3); the other end of the connecting pipe (5) is fixed and connected to the side wall of the water inlet pipe (4); and the length direction of the test pool (1) is the driving direction of the water flow by the rotation of the blades.

7. A testing device for ship drive blades according to claim 1, characterized in that: The gantry (9) and the top of one of the guide rods (8) are provided with a same set of sensing mechanisms (11), the sensing mechanism (11) comprising a support plate (28) fixed to the outer wall of the top of one of the guide rods (8), a fixing ring (29) fixed to the outer wall of the top of the gantry (9), and a cylinder body (33) welded to and connected to the side wall of the fixing ring (29), a conductive resistance spring (35) is fixed to the inner wall of the fixing ring (29), a conductive plunger (30) is fixedly embedded in the inner wall of the support plate (28), and the conductive plunger (30) and the conductive resistance spring (35) are connected in series to the power supply circuit of the motor (27).

8. A testing device for ship drive blades according to claim 7, characterized in that: The inner wall of the cylinder (33) is slidably fitted with a piston (34), the end surface of the cylinder (33) is fixedly embedded with a push-type signal switch (31), a shell portion of the push-type signal switch (31) is welded with a second spring (32), and the other end of the second spring (32) contacts and fits with the end surface of the piston (34).

9. A testing device for ship drive blades according to claim 8, characterized in that: A limit assembly is provided on the side wall of the piston (34), the limit assembly comprising an arc head limit block (36) slidably connected to the inner wall of the cylinder body (33) and an adjusting bolt (39) threadedly connected to the side wall of the cylinder body (33), the end of the adjusting bolt (39) being rotatably connected to a limit slide plate (38), and the limit slide plate (38) being connected to the arc head limit block (36) via a spring three (37).

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