A centrifugal load test device and test method thereof

Abstract

The present invention provides a centrifugal load test device and a test method thereof, wherein the blade reinforcement is detachably connected to the hub; the adapter shaft is a stepped shaft, and the blade reinforcement and the adapter shaft share a common central axis; the bow clamp is fixed to the frame and sleeved on the second shaft; the adjusting gasket is sleeved on the adapter shaft, and the number and thickness of the adjusting gasket are determined according to the length of the blade reinforcement and the centrifugal load loading position, so as to adjust the distance between the adapter shaft and the blade reinforcement; there are two centrifugal load applying devices, which are connected to the symmetrical ends of the bow clamp in a one-to-one correspondence, so that the centrifugal load is transmitted to the hub through the adapter shaft and the blade reinforcement in turn, so as to complete the centrifugal load test. The present invention provides a centrifugal load test device and a test method thereof, which only requires the blade reinforcement for different centrifugal load loading positions and blade reinforcement lengths of different lengths, has low cost, is easy to install and operate, and has accurate testing.

Description

Technical Field

[0001] The invention relates to the technical field of propeller hub testing devices, and more particularly to a centrifugal load testing device and a testing method thereof. Background Art

[0002] The hub is an important moving part during the operation of the propeller. It bears most of the centrifugal loads generated by the rotation of the propeller. Therefore, the strength performance of the hub needs to be verified through tests.

[0003] During the propeller hub fatigue test, static test, and stress-strain distribution test, the centrifugal load of the hub is applied by a hydraulic cylinder, and the centrifugal load loading position and the blade reinforcement length of different tests are different. However, currently, a set of test equipment needs to be processed for the centrifugal load loading position and the blade reinforcement length of different tests to match the corresponding centrifugal load loading position and the corresponding blade reinforcement length, which results in high cost and inconvenient installation.

[0004] Therefore, how to provide a centrifugal load test device and a test method thereof which are easy to install and have low cost is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0005] In view of this, the present invention provides a centrifugal load testing device and a testing method thereof. For different centrifugal load loading positions and different lengths of blade reinforcements, only blade reinforcements are required, so that the present invention has low cost and is easy to install and operate. At the same time, the applied centrifugal load can be transmitted to the hub along the axis of the hub, so as to ensure the accuracy of the centrifugal load test of the hub by the present invention.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A centrifugal load testing device, comprising:

[0008] A blade reinforcement member, wherein the blade reinforcement member is detachably connected to the propeller hub;

[0009] A transfer shaft, the transfer shaft is a stepped shaft, comprising a first shaft and a second shaft with an outer diameter smaller than that of the first shaft, one end of the first shaft is hinged to the blade reinforcement, the other end is integrally connected to the second shaft, and a shaft shoulder is formed at the connection with the second shaft, and the blade reinforcement, the first shaft and the second shaft share a central axis;

[0010] A bow-shaped clamp, which is fixed on the frame and sleeved on the second shaft, with two ends of the bow-shaped clamp symmetrically located on both sides of the axis of the second shaft, and an end of the second shaft away from the first shaft is detachably connected to a limit nut;

[0011] An adjusting washer, wherein the adjusting washer is sleeved on the second shaft, and the number and thickness of the adjusting washer are determined according to the length of the blade reinforcement and the centrifugal load loading position, so as to adjust the distance between the first shaft and the blade reinforcement, and the adjusting washer and the bow clamp abut between the shaft shoulder and the limit nut;

[0012] There are two centrifugal load applying devices, which are connected to the two ends of the bow clamp in a one-to-one manner, and the two centrifugal load applying devices are symmetrically located on both sides of the axis of the second shaft, and at the same time, the two centrifugal load applying devices apply the same centrifugal load.

[0013] Preferably, one end of the first shaft is rotatably connected to the blade reinforcement via a pin.

[0014] Preferably, through holes are provided at positions of the first shaft and the blade reinforcement corresponding to the pin shaft, the pin shaft is inserted into the two through holes, and the head end of the pin shaft has a limiting cap, and a positioning groove is provided circumferentially on the side wall of the pin shaft near its tail end, and a spring clip is clamped in the positioning groove.

[0015] Preferably, a sleeve hole is opened on the bow clamp along the axial direction of the second shaft, and a first key groove is opened on the inner wall of the sleeve hole, and a plurality of second key grooves are opened on the second shaft along its axis, and the plurality of second key grooves are distributed along the axis of the second shaft, and the second shaft can reciprocate in the sleeve hole along the axis of the second shaft so that one of the second key grooves corresponds to the first key groove, and the corresponding second key grooves are connected to the first key groove by a key.

[0016] Preferably, the centrifugal load applying device comprises:

[0017] A ball bearing, the inner ring of which is fixed to the end of the bow clamp by a pin;

[0018] A steel wire rope, the steel wire rope is sleeved and fixed on the outer ring of the ball bearing;

[0019] A hydraulic cylinder, wherein the piston rod of the hydraulic cylinder fixes the two ends of the steel wire rope respectively, and the centrifugal load applied by the hydraulic cylinder is transmitted to the propeller hub through the steel wire rope, the ball bearing, the bow clamp, the second shaft, the first shaft, and the blade reinforcement in sequence;

[0020] A controller is electrically connected to the hydraulic cylinder.

[0021] Preferably, the two ball bearings at both ends of the bow clamp are symmetrical, and the steel wire ropes at both ends of the bow clamp are symmetrical, and the hydraulic cylinders at both ends of the bow clamp are symmetrical.

[0022] Preferably, the adjusting gasket includes: a first adjusting gasket and a second adjusting gasket, the number and thickness of the first adjusting gasket and the second adjusting gasket are determined according to the length of the blade reinforcement and the centrifugal load loading position, and the first adjusting gasket abuts between the shaft shoulder and the bow clamp, and the second adjusting gasket abuts between the bow clamp and the limit nut.

[0023] A test method for a centrifugal load test device comprises the following steps:

[0024] S1: fix the bow clamp to keep it stationary;

[0025] S2: adjusting the distance between the first shaft and the blade reinforcement member according to the diameter of the hub, the length of the blade, and the position where the centrifugal load is loaded, and fixing the blade reinforcement member on the hub, while fixing the hub on the base;

[0026] S3: The first shaft of the adapter shaft is rotatably connected to the blade reinforcement member through a pin shaft, and at the same time, a first adjustment gasket is sleeved on the second shaft of the adapter shaft, wherein the number and thickness of the first adjustment gasket are determined according to the length of the blade reinforcement member and the centrifugal load loading position, and at this time, the first adjustment gasket is arranged close to the shoulder of the adapter shaft;

[0027] S4: passing the second shaft through the sleeve hole of the bow clamp, and making one of the second key slots on the second shaft correspond to the first key slot on the inner wall of the sleeve hole, and the corresponding second key slots are connected to the first key slots by a key, and second adjusting washers are sleeved on the second shaft, and the number and thickness of the second adjusting washers are determined according to the length of the blade reinforcement and the centrifugal load loading position;

[0028] S5: screwing a limit nut on an end of the second shaft away from the first shaft, and making the limit nut abut against the second adjusting washer, the bow clamp, the first adjusting washer and the shaft shoulder in sequence, and making the blade reinforcement, the first shaft and the second shaft share a central axis;

[0029] S6: The controller controls the centrifugal load applying devices at the symmetrical ends of the bow clamp to simultaneously apply centrifugal loads to the bow clamp, and the centrifugal loads applied by the two centrifugal load applying devices are the same. The centrifugal loads are then transmitted to the hub through the second shaft, the first shaft and the blade reinforcement in sequence, thereby completing the centrifugal load test.

[0030] Preferably, the centrifugal load applying device comprises:

[0031] A ball bearing, the inner ring of which is fixed to the end of the bow clamp by a pin;

[0032] A steel wire rope, wherein the steel wire rope is fixed to the outer ring of the ball bearing;

[0033] A hydraulic cylinder, a piston rod of the hydraulic cylinder is fixed together with the steel wire rope, and a centrifugal load applied by the hydraulic cylinder is transmitted to the propeller hub through the steel wire rope, the ball bearing, the bow clamp, the second shaft, the first shaft, and the blade reinforcement in sequence;

[0034] A controller electrically connected to the hydraulic cylinder;

[0035] Furthermore, the two ball bearings at both ends of the bow clamp are symmetrical, the steel wire ropes at both ends of the bow clamp are symmetrical, and the hydraulic cylinders at both ends of the bow clamp are symmetrical.

[0036] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a centrifugal load test device, which can achieve the following technical effects:

[0037] (1) The bow clamp 3 is fixed, the blade reinforcement member 1 is fixed to the hub, and the hub is fixed to the base. The number and thickness of the first adjustment gasket 51 and the second adjustment gasket 52 are adjusted according to the length of the blade reinforcement member 1 and the centrifugal load loading position, so as to adjust the distance between the adapter shaft 2 and the bow clamp 3. At the same time, there is no need to disassemble and replace the centrifugal load applying device 6, which is simple to operate and has low cost.

[0038] (2) The first shaft 21 of the adapter shaft 2 is detachably connected to the blade reinforcement 1. For blade reinforcements 1 of different lengths and centrifugal load loading positions, only the corresponding blade reinforcement 1 needs to be replaced, which is low in cost and easy to disassemble and assemble;

[0039] (3) The first shaft 21 and the blade reinforcement member 1 are connected by the pin shaft 7, which is not only convenient for disassembly and assembly, but also convenient for adjusting the coaxiality of the blade reinforcement member 1 and the adapter shaft 2;

[0040] (4) The blade reinforcement 1, the first shaft 21 and the second shaft 22 of the present invention have a common central axis, and the two centrifugal load applying devices 6 are symmetrical and apply the same centrifugal load. Therefore, the centrifugal load applied by the present invention can be transmitted to the hub along the axis of the hub, so as to ensure the accuracy of the centrifugal load test of the hub by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0042] Figure 1 A cross-sectional view of a centrifugal load test device of the present invention partially cuts through the second axis;

[0043] Figure 2 A cross-sectional view of a centrifugal load test device of the present invention partially cutting a first shaft and a blade reinforcement member;

[0044] Figure 3 It is a side view of the adapter shaft of the present invention;

[0045] Figure 4 for Figure 3 Cross-section at the middle BB;

[0046] Figure 5 It is a top view of the bow clamp of the present invention.

[0047] Among them, 1-blade reinforcement; 2-adapter shaft; 21-first shaft; 22-second shaft; 20-shaft shoulder; 3-bow clamp; 4-limit nut; 5-adjusting gasket; 6-centrifugal load applying device; 7-pin shaft; 71-limiting cap; 72-spring clip; 61-ball bearing; 60-pin; 62-wire rope; 63-hydraulic cylinder; 51-first adjusting gasket; 52-second adjusting gasket; 30-hole; 301-first keyway; 220-second keyway. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The embodiment of the present invention discloses a centrifugal load test device, comprising:

[0050] A blade reinforcement member 1, wherein the blade reinforcement member 1 is detachably connected to the propeller hub;

[0051] The adapter shaft 2 is a stepped shaft, including a first shaft 21 and a second shaft 22 with an outer diameter smaller than that of the first shaft 21. One end of the first shaft 21 is hinged to the blade reinforcement 1, and the other end is integrally connected to the second shaft 22, and a shaft shoulder 20 is formed at the connection with the second shaft 22. At the same time, the blade reinforcement 1, the first shaft 21 and the second shaft 22 share a central axis;

[0052] The bow-shaped clamp 3 is fixed on the frame and sleeved on the second shaft 22. The two ends of the bow-shaped clamp 3 are symmetrically located on both sides of the axis of the second shaft 22. At the same time, one end of the second shaft 22 away from the first shaft 21 is detachably connected to the limiting nut 4;

[0053] The adjusting gasket 5 is sleeved on the second shaft 22, and the number and thickness of the adjusting gasket 5 are determined according to the length of the blade reinforcement 1 and the centrifugal load loading position, so as to adjust the distance between the first shaft 21 and the blade reinforcement 1, and at the same time, the adjusting gasket 5 and the bow clamp 3 are abutted between the shaft shoulder 20 and the limit nut 4;

[0054] There are two centrifugal load applying devices 6 , which are connected to the two ends of the bow clamp 3 one by one, and the two centrifugal load applying devices 6 are symmetrically located on both sides of the axis of the second shaft 22 , and the two centrifugal load applying devices 6 apply the same centrifugal load.

[0055] The first shaft 21 of the adapter shaft 2 of the present invention is detachably connected to the blade reinforcement 1, so that for blade reinforcements 1 of different lengths and centrifugal load loading positions, it is only necessary to replace the corresponding blade reinforcement 1, that is, it is only necessary to re-install the blade reinforcement 1, so that the present invention has low cost and is easy to install. At the same time, when the present invention tests blade reinforcements 1 of different lengths and centrifugal load loading positions, after fixing a new hub and a new blade reinforcement 1, it is not necessary to re-disassemble the centrifugal load applying device 6, and it is only necessary to remove the limit nut 4 and then remove the adapter shaft 2 from the bow clamp 3. The number and thickness of the adjusting gaskets 5 installed on the adapter shaft 2 are adjusted so that the distance between the first shaft 21 and the blade reinforcement 1 can be adjusted. Finally, the adapter shaft 2 is reinstalled on the bow clamp 3, and the limit nut 4 is installed on the second shaft 22 of the adapter shaft 2, so that the present invention is easy to operate. The blade reinforcement 1, the first shaft 21 and the second shaft 22 of the present invention have a common central axis, and the two centrifugal load applying devices 6 are symmetrical and apply the same centrifugal load. Therefore, the centrifugal load applied by the present invention can be transmitted to the hub along the axis of the hub, so that the accuracy of the hub centrifugal load test of the present invention can be guaranteed.

[0056] In order to further optimize the above technical solution, one end of the first shaft 21 is rotatably connected to the blade reinforcement 1 through a pin shaft 7 .

[0057] The present invention adopts the above-mentioned technical scheme, and the beneficial effects that can be achieved are: it is easy to disassemble the blade reinforcement 1 from the adjustment adapter shaft 2, so that for blade reinforcements 1 of different lengths and centrifugal load loading positions, the blade reinforcement 1 matching the hub length to be tested can be reinstalled on the adapter shaft 2, and at the same time, it is easy to adjust the coaxiality of the blade reinforcement 1 and the adapter shaft 2, thereby reducing the test error.

[0058] In order to further optimize the above technical solution, through holes are opened at the positions of the first shaft 21 and the blade reinforcement 1 corresponding to the pin shaft 7, the pin shaft 7 is inserted in the two through holes, and the head end of the pin shaft 7 has a limiting cap 71, and a positioning groove is opened circumferentially on the side wall of the pin shaft 7 near its tail end, and a spring clip 72 is clamped in the positioning groove.

[0059] The present invention adopts the above technical solution, which can achieve the following beneficial effects: the limiting cap 71 and the spring clip 72 can prevent the pin shaft 7 from moving out of the corresponding through holes on the first shaft 21 and the blade reinforcement member 1, and the operation is convenient and the cost is low.

[0060] In order to further optimize the above technical solution, a sleeve hole 30 is opened on the bow clamp 3 along the axial direction of the second shaft 22, and a first key groove 301 is opened on the inner wall of the sleeve hole 30, and a plurality of second key grooves 220 are opened on the second shaft 22 along its axis, and the plurality of second key grooves 220 are distributed along the axis of the second shaft 22. The second shaft 22 can reciprocate along the axis of the second shaft 22 in the sleeve hole 30 so that one of the second key grooves 220 corresponds to the first key groove 301, and the corresponding second key grooves 220 and the first key groove 301 are connected by a key.

[0061] The present invention adopts the above technical solution, and the beneficial effects that can be achieved are: the second shaft 22 can reciprocate along the axis of the second shaft 22 in the sleeve hole 30, so that the present invention can conveniently adjust the distance between the first shaft 21 and the blade reinforcement 1 according to the length of the blade reinforcement 1 and the centrifugal load loading position. At the same time, when the position is adjusted, the bow clamp 3 is circumferentially positioned by a key to prevent the bow clamp 3 from circumferentially rotating on the second shaft 22.

[0062] In order to further optimize the above technical solution, the centrifugal load applying device 6 includes:

[0063] A ball bearing 61, the inner ring of which is fixed to the end of the bow clamp 3 by a pin 60;

[0064] A steel wire rope 62, the steel wire rope 62 is sleeved and fixed on the outer ring of the ball bearing 61;

[0065] The hydraulic cylinder 63, the piston rod of the hydraulic cylinder 63 respectively fixes the two ends of the steel wire rope 62, and the centrifugal load applied by the hydraulic cylinder 63 is transmitted to the propeller hub through the steel wire rope 62, the ball bearing 61, the bow clamp 3, the second shaft 22, the first shaft 21, and the blade reinforcement 1 in sequence;

[0066] A controller is electrically connected to the hydraulic cylinder 63 .

[0067] The present invention adopts the above technical solution, and the beneficial effects that can be achieved are: the wire rope 62 is respectively connected to the piston rod of the hydraulic cylinder 63 and the ball bearing 61, and the ball bearing 61 is fixed to the end of the bow clamp 3 by the pin 60, so that the two wire ropes 62 sleeved on the outer ring of the ball bearing 61 can be guaranteed to be balanced in force, thereby ensuring that the centrifugal load acts on the propeller hub along the axis of the propeller hub, so as to ensure the accuracy of the experiment of the present invention.

[0068] In order to further optimize the above technical solution, the two ball bearings 61 at both ends of the bow clamp 3 are symmetrical, and the wire ropes 62 at both ends of the bow clamp 3 are symmetrical, and the hydraulic cylinders 63 at both ends of the bow clamp 3 are symmetrical.

[0069] The present invention adopts the above technical solution, which can achieve the beneficial effect of further ensuring that the centrifugal load acts on the hub along the axis of the hub, so as to ensure the accuracy of the experiment of the present invention.

[0070] In order to further optimize the solution of the above-mentioned technology, the adjusting gasket 5 includes: a first adjusting gasket 51 and a second adjusting gasket 52. The number and thickness of the first adjusting gasket 51 and the second adjusting gasket 52 are determined according to the length of the blade reinforcement 1 and the centrifugal load loading position, and the first adjusting gasket 51 abuts between the shaft shoulder 20 and the bow clamp 3, and the second adjusting gasket 52 abuts between the bow clamp 3 and the limit nut 4.

[0071] The present invention adopts the above technical solution, which can achieve the following beneficial effects: so as to improve the flexibility and convenience of adjusting the distance between the adapter shaft 2 and the blade reinforcement 1.

[0072] In order to further optimize the above technical solution, the inner walls of the center holes of the first adjusting gasket 51 and the second adjusting gasket 52 are both provided with slots for engaging with the key.

[0073] The present invention adopts the above technical solution, which can achieve the beneficial effect of preventing the key from affecting the normal assembly of the first adjustment gasket 51 and the second adjustment gasket 52, so that the first adjustment gasket 51 and the second adjustment gasket 52 can be stable and adapt to the second shaft 22.

[0074] A test method for a centrifugal load test device comprises the following steps:

[0075] S1: Fix the bow clamp 3 so that the bow clamp 3 remains stationary;

[0076] S2: According to the diameter of the hub, the length of the blade, and the different centrifugal load loading positions, the distance between the first shaft 21 and the blade reinforcement 1 is adjusted, and the blade reinforcement 1 is fixed to the hub, and the hub is fixed to the base;

[0077] S3: The first shaft 21 of the adapter shaft 2 is rotatably connected to the blade reinforcement 1 through the pin shaft 7, and at the same time, the first adjustment gasket 51 is sleeved on the second shaft 22 of the adapter shaft 2. The number and thickness of the first adjustment gaskets 51 are determined according to the length of the blade reinforcement 1 and the centrifugal load loading position, and at this time, the first adjustment gaskets 51 are arranged close to the shoulder 20 of the adapter shaft 2;

[0078] S4: The second shaft 22 is passed through the sleeve hole 30 of the bow clamp 3, and one of the second key grooves 220 on the second shaft 22 corresponds to the first key groove 301 on the inner wall of the sleeve hole 30, and the corresponding second key grooves 220 and the first key grooves 301 are connected by a key, and the second shaft 22 is sleeved with a second adjustment gasket 52, and the number and thickness of the second adjustment gasket 52 are determined according to the length of the blade reinforcement 1 and the centrifugal load loading position;

[0079] S5: Screw on the limit nut 4 at the end of the second shaft 22 away from the first shaft 21, and make the limit nut 4 abut against the second adjustment gasket 52, the bow clamp 3, the first adjustment gasket 51 and the shaft shoulder 20 in sequence, and at the same time make the blade reinforcement 1, the first shaft 21 and the second shaft 22 have a central axis;

[0080] S6: The controller controls the centrifugal load applying devices 6 at the symmetrical ends of the bow clamp 3 to apply centrifugal load to the bow clamp 3 at the same time, and the centrifugal loads applied by the two centrifugal load applying devices 6 are the same. The centrifugal load is then transmitted to the hub through the second shaft 22, the first shaft 21 and the blade reinforcement 1 in sequence, and the centrifugal load test is completed.

[0081] The present invention adopts the above method: (1) the bow clamp 3 is fixed, and the blade reinforcement member 1 is fixed on the hub. After the hub is fixed on the base, the number and thickness of the first adjustment gasket 51 and the second adjustment gasket 52 are adjusted according to the length of the blade reinforcement member 1 and the centrifugal load loading position, so as to adjust the distance between the adapter shaft 2 and the bow clamp 3. At the same time, there is no need to disassemble and replace the centrifugal load applying device 6, which is simple to operate and has low cost;

[0082] (1) The first shaft 21 of the adapter shaft 2 is detachably connected to the blade reinforcement 1. For blade reinforcements 1 of different lengths and centrifugal load loading positions, only the corresponding blade reinforcement 1 needs to be replaced, which is low in cost and easy to disassemble and assemble;

[0083] (3) The first shaft 21 and the blade reinforcement member 1 are connected by the pin shaft 7, which is not only convenient for disassembly and assembly, but also convenient for adjusting the coaxiality of the blade reinforcement member 1 and the adapter shaft 2;

[0084] (4) The blade reinforcement 1, the first shaft 21 and the second shaft 22 of the present invention have a common central axis, and the two centrifugal load applying devices 6 are symmetrical and apply the same centrifugal load. Therefore, the centrifugal load applied by the present invention can be transmitted to the hub along the axis of the hub, so as to ensure the accuracy of the centrifugal load test of the hub by the present invention.

[0085] In order to further optimize the above technical solution, the centrifugal load applying device 6 includes:

[0086] A ball bearing 61, the inner ring of which is fixed to the end of the bow clamp 3 by a pin 60;

[0087] A steel wire rope 62, the steel wire rope 62 is fixed on the outer ring of the ball bearing 61;

[0088] A hydraulic cylinder 63, a piston rod of the hydraulic cylinder 63 is fixed together with the steel wire rope 62, and the centrifugal load applied by the hydraulic cylinder 63 is transmitted to the propeller hub through the steel wire rope 62, the ball bearing 61, the bow clamp 3, the second shaft 22, the first shaft 21, and the blade reinforcement 1 in sequence;

[0089] A controller, the controller is electrically connected to the hydraulic cylinder 63;

[0090] Furthermore, the two ball bearings 61 at both ends of the bow clamp 3 are symmetrical, the steel wire ropes 62 at both ends of the bow clamp 3 are symmetrical, and the hydraulic cylinders 63 at both ends of the bow clamp 3 are symmetrical.

[0091] The present invention adopts the above technical solution, and the beneficial effects that can be achieved are: the wire rope 62 is respectively connected to the piston rod of the hydraulic cylinder 63 and the ball bearing 61, and the ball bearing 61 is fixed to the end of the bow clamp 3 by the pin 60, so that the two wire ropes 62 sleeved on the outer ring of the ball bearing 61 can be guaranteed to be balanced in force, thereby ensuring that the centrifugal load acts on the propeller hub along the axis of the propeller hub, so as to ensure the accuracy of the experiment of the present invention.

[0092] Embodiment 1: The embodiment of the present invention discloses a centrifugal load test device, and the test method thereof comprises the following steps:

[0093] S1: Fix the bow clamp 3 so that the bow clamp 3 remains stationary;

[0094] S2: According to the diameter of the hub, the length of the blade, and the position of the centrifugal load, the distance between the first shaft 21 and the blade reinforcement 1 is adjusted (the diameter of the blade reinforcement 1 and the hub are the same as the blade length), and the blade reinforcement 1 is fixed to the hub, and the hub is fixed to the base;

[0095] S3: The first shaft 21 of the adapter shaft 2 is rotatably connected to the blade reinforcement 1 through the pin shaft 7, and at the same time, the first adjustment gasket 51 is sleeved on the second shaft 22 of the adapter shaft 2. The number and thickness of the first adjustment gaskets 51 are determined according to the length of the blade reinforcement 1 and the centrifugal load loading position, and at this time, the first adjustment gaskets 51 are arranged close to the shoulder 20 of the adapter shaft 2;

[0096] S4: The second shaft 22 is passed through the sleeve hole 30 of the bow clamp 3, and one of the second key grooves 220 on the second shaft 22 corresponds to the first key groove 301 on the inner wall of the sleeve hole 30, and the corresponding second key grooves 220 and the first key grooves 301 are connected by a key, and the second shaft 22 is sleeved with a second adjustment gasket 52, and the number and thickness of the second adjustment gasket 52 are determined according to the length of the blade reinforcement 1 and the centrifugal load loading position;

[0097] S5: Screw on the limit nut 4 at the end of the second shaft 22 away from the first shaft 21, and make the limit nut 4 abut against the second adjustment gasket 52, the bow clamp 3, the first adjustment gasket 51 and the shaft shoulder 20 in sequence, and at the same time make the blade reinforcement 1, the first shaft 21 and the second shaft 22 have a central axis;

[0098] S6: The controller controls the centrifugal load applying devices 6 at the symmetrical ends of the bow clamp 3 to apply centrifugal load to the bow clamp 3 at the same time, and the centrifugal loads applied by the two centrifugal load applying devices 6 are the same. The centrifugal load is then transmitted to the hub through the second shaft 22, the first shaft 21 and the blade reinforcement 1 in sequence, and the centrifugal load test is completed.

[0099] Example 2: The length of the hub and the blade reinforcement 1 is longer than that of the hub and the blade reinforcement 1 in Example 1, the load acting position is the same, and the experimental steps are as follows;

[0100] A1: The length of the propeller hub in Example 2 is longer than that in Example 1, and the length of the blade reinforcement member 1 in Example 2 is longer than that of the blade reinforcement member 1 in Example 1. Then, the propeller hub in Example 1 is removed from the blade reinforcement member 1 and the base in Example 1 respectively, and the pin shaft 7 is pulled out at the same time to separate the blade reinforcement member 1 in Example 1 from the first shaft 21;

[0101] A2: The blade reinforcement member 1 in Example 2 is fixed on the hub in Example 2, and the hub in Example 2 is fixed on the base (i.e., the base in Example 1 is fixed);

[0102] A3: Remove the limit nut 4 and the second adjustment washer 52, remove the key, and pull the second shaft 22 out of the bow clamp 3:

[0103] A4: Move the adapter shaft 2 in a direction away from the base. When the through hole for assembling the pin shaft 7 on the first shaft 21 of the adapter shaft 2 corresponds to the through hole for assembling the pin shaft 7 on the blade reinforcement member 1 in Example 2, insert the pin shaft 7 into the two through holes, and clamp the spring clamp 72 on the pin shaft 7.

[0104] A5: reducing the number and thickness of the first adjusting gaskets 51 on the second shaft 22 according to the length of the blade reinforcement 1 and the centrifugal load loading position in Embodiment 2;

[0105] A6: The second shaft 22 is re-inserted into the sleeve hole 30 on the bow clamp 3, and the first key groove 301 on the inner wall of the sleeve hole 30 corresponds to the second key groove 220 adapted to the position of the second shaft 22, and the first key groove 301 is connected to the newly corresponding second key groove 220 through a key, and at the same time, the number and thickness of the second adjustment gaskets 52 sleeved on the second shaft 22 are increased, and the number and thickness of the second adjustment gaskets 52 are determined according to the length of the blade reinforcement member 1 and the centrifugal load loading position in Example 2;

[0106] A7: Re-tighten the limit nut 4 at the end of the second shaft 22 away from the first shaft 21, and make the limit nut 4 abut against the second adjustment washer 52, the bow clamp 3, the first adjustment washer 51 and the shaft shoulder 20 in sequence, and at the same time make the blade reinforcement member 1, the first shaft 21 and the second shaft 22 in Example 2 have a central axis;

[0107] Then repeat step S6 in the embodiment.

[0108] Embodiment 3: The length of the hub and the blade reinforcement 1 is equal to the length of the hub and the blade reinforcement 1 in Embodiment 1, and the load action position is farther away from the blade reinforcement 1 than that in Embodiment 1. According to the method in Embodiment 2, the limit nut 4 and the second adjusting gasket 52 are removed, and the second shaft 22 is pulled out of the bow clamp 3, and then the number and thickness of the first adjusting gaskets 51 and the second adjusting gaskets 52 are adjusted, so that the number and thickness of the first adjusting gaskets 51 are increased, and the number and thickness of the second adjusting gaskets 52 are reduced, and finally, the centrifugal load test device of the present invention is assembled according to the method in Embodiment 2.

[0109] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0110] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A centrifugal load test device, characterized in that: include: A blade reinforcement member (1), wherein the blade reinforcement member (1) is detachably connected to the propeller hub; A transfer shaft (2), the transfer shaft (2) being a stepped shaft, comprising a first shaft (21) and a second shaft (22) having an outer diameter smaller than that of the first shaft (21), one end of the first shaft (21) being hinged to the blade reinforcement member (1), the other end of the first shaft (21) being integrally connected to the second shaft (22), and a shaft shoulder (20) being formed at a connection with the second shaft (22), and the blade reinforcement member (1), the first shaft (21) and the second shaft (22) being coaxially aligned with a central axis; A bow-shaped clamp (3), the bow-shaped clamp (3) is fixed on the frame and sleeved on the second shaft (22), the two ends of the bow-shaped clamp (3) are symmetrically located on both sides of the axis of the second shaft (22), and the end of the second shaft (22) away from the first shaft (21) is detachably connected to a limiting nut (4); An adjusting gasket (5), wherein the adjusting gasket (5) is sleeved on the second shaft (22), and the number and thickness of the adjusting gasket (5) are determined according to the length of the blade reinforcement member (1) and the centrifugal load loading position, so as to adjust the distance between the first shaft (21) and the blade reinforcement member (1), and at the same time, the adjusting gasket (5) and the bow clamp (3) are abutted between the shaft shoulder (20) and the limit nut (4); A centrifugal load applying device (6), wherein the number of the centrifugal load applying devices (6) is two, and the two centrifugal load applying devices (6) are connected to the two ends of the bow clamp (3) in a one-to-one correspondence, and the two centrifugal load applying devices (6) are symmetrically located on both sides of the axis of the second shaft (22), and the two centrifugal load applying devices (6) apply the same centrifugal load; The centrifugal load applying device (6) comprises: A ball bearing (61), the inner ring of the ball bearing (61) being fixed to the end of the bow clamp (3) via a pin (60); A steel wire rope (62), wherein the steel wire rope (62) is sleeved and fixed on the outer ring of the ball bearing (61); A hydraulic cylinder (63), wherein the piston rod of the hydraulic cylinder (63) fixes the two ends of the steel wire rope (62) respectively, and the centrifugal load applied by the hydraulic cylinder (63) is transmitted to the propeller hub through the steel wire rope (62), the ball bearing (61), the bow clamp (3), the second shaft (22), the first shaft (21), and the blade reinforcement (1) in sequence; A controller is electrically connected to the hydraulic cylinder (63).

2. A centrifugal load test device according to claim 1, characterized in that: One end of the first shaft (21) is rotatably connected to the blade reinforcement (1) via a pin shaft (7).

3. A centrifugal load test device according to claim 2, characterized in that: The first shaft (21) and the blade reinforcement (1) are both provided with through holes at positions corresponding to the pin shaft (7), the pin shaft (7) is inserted into the two through holes, and the head end of the pin shaft (7) is provided with a limiting cap (71), and a positioning groove is provided on the side wall of the pin shaft (7) near its tail end along the circumferential direction, and a spring clip (72) is clamped in the positioning groove.

4. A centrifugal load test device according to claim 3, characterized in that: The bow-shaped clamp (3) is provided with a sleeve hole (30) along the axial direction of the second shaft (22), and a first key groove (301) is provided on the inner wall of the sleeve hole (30). The second shaft (22) is provided with a plurality of second key grooves (220) along its axis, and the plurality of second key grooves (220) are distributed along the axis of the second shaft (22). The second shaft (22) can reciprocate along the axis of the second shaft (22) in the sleeve hole (30) so that one of the second key grooves (220) corresponds to the first key groove (301), and the corresponding second key grooves (220) and the first key groove (301) are connected by a key.

5. A centrifugal load testing device according to claim 1, characterized in that: The two ball bearings (61) at both ends of the bow-shaped clamp (3) are symmetrical, and the steel wire ropes (62) at both ends of the bow-shaped clamp (3) are symmetrical, and the hydraulic cylinders (63) at both ends of the bow-shaped clamp (3) are symmetrical.

6. A centrifugal load test device according to claim 4, characterized in that: The adjusting gasket (5) comprises: a first adjusting gasket (51) and a second adjusting gasket (52); the number and thickness of the first adjusting gasket (51) and the second adjusting gasket (52) are determined according to the length of the blade reinforcement (1) and the centrifugal load loading position; the first adjusting gasket (51) abuts between the shaft shoulder (20) and the bow clamp (3), and the second adjusting gasket (52) abuts between the bow clamp (3) and the limit nut (4).

7. A test method based on the centrifugal load test device according to claim 6, characterized in that: The steps include: S1: fix the bow clamp (3) so that the bow clamp (3) remains stationary; S2: adjusting the distance between the first shaft (21) and the blade reinforcement (1) according to the diameter of the hub, the length of the blade, and the position of the centrifugal load, and fixing the blade reinforcement (1) on the hub, while fixing the hub on the base; S3: The first shaft (21) of the adapter shaft (2) is rotatably connected to the blade reinforcement member (1) via a pin shaft (7), and at the same time, a first adjustment gasket (51) is sleeved on the second shaft (22) of the adapter shaft (2), wherein the number and thickness of the first adjustment gasket (51) are determined according to the length of the blade reinforcement member (1) and the centrifugal load loading position, and at this time, the first adjustment gasket (51) is arranged close to the shaft shoulder (20) of the adapter shaft (2); S4: passing the second shaft (22) through the sleeve hole (30) of the bow-shaped clamp (3), and making one of the second key grooves (220) on the second shaft (22) correspond to the first key groove (301) on the inner wall of the sleeve hole (30), and the corresponding second key grooves (220) and the first key grooves (301) are connected by a key, and second adjustment washers (52) are sleeved on the second shaft (22), and the number and thickness of the second adjustment washers (52) are determined according to the length of the blade reinforcement (1) and the centrifugal load loading position; S5: screwing the limit nut (4) on the end of the second shaft (22) away from the first shaft (21), and making the limit nut (4) abut against the second adjustment washer (52), the bow clamp (3), the first adjustment washer (51) and the shaft shoulder (20) in sequence, and making the blade reinforcement (1), the first shaft (21) and the second shaft (22) share a common central axis; S6: The controller controls the centrifugal load applying devices (6) at the symmetrical ends of the bow clamp (3) to simultaneously apply a centrifugal load to the bow clamp (3), and the centrifugal loads applied by the two centrifugal load applying devices (6) are the same. The centrifugal load is then transmitted to the hub via the second shaft (22), the first shaft (21) and the blade reinforcement (1) in sequence, thereby completing the centrifugal load test.

8. The test method of the centrifugal load test device according to claim 7, characterized in that: The two ball bearings (61) at both ends of the bow-shaped clamp (3) are symmetrical, the steel wire ropes (62) at both ends of the bow-shaped clamp (3) are symmetrical, and the hydraulic cylinders (63) at both ends of the bow-shaped clamp (3) are symmetrical.

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