CN115092417A

CN115092417A - Rotor dynamic balance tester

Info

Publication number: CN115092417A
Application number: CN202210632889.XA
Authority: CN
Inventors: 李云铮
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2022-09-23

Abstract

The invention relates to a rotor dynamic balance tester, which comprises a support frame, a first connecting part and a second connecting part, wherein the support frame comprises a support part and a first connecting part; the balance bar is provided with a first end and a second end which are free ends, a second connecting part is arranged between the first end and the second end, and the first connecting part is rotationally connected with the second connecting part; a blade drive mechanism mounted at a first end of the balance bar configured to drive rotation of a blade under test; and a vibration detection mechanism mounted at the second end of the balance bar configured to sense vibration of the balance bar as the blade rotates. The invention can accurately test the dynamic unbalance phenomenon of the paddle by adopting the principle of the balance bar, and the test equipment has small volume, light weight, low cost, convenient installation and simple maintenance and is suitable for common users of the rotor craft.

Description

Rotor dynamic balance tester

Technical Field

The invention relates to the technical field of dynamic balance testing, in particular to a rotor wing dynamic balance tester.

Background

For rotor type aircrafts such as unmanned planes, helicopters, multi-blade aircrafts and the like, blades of the rotor type aircrafts are one of important components. When there is a difference in the aerodynamic forces of the blades, a dynamic imbalance is caused which not only causes vibrations and noise, but also reduces the flight performance, handling quality and service life of such aircraft.

There are two main types of rotor balance testers at present: static balance tester and dynamic balance test platform. The static balance tester is used for static balance test of a rotor of a fixed-wing airplane or a helicopter, and is mainly used for weighing the weight of the blade and measuring the gravity center of the blade under a static condition. Although the static balance tester has a simple structure and analysis method, it is difficult to satisfy the balance test in the rotating state required by the multiple rotors. At present, some common dynamic balance test methods are used for driving a blade to rotate at a high speed, measuring a motion track of a blade tip in a rotating state of the blade and sensing related data so as to perform dynamic balance analysis. Therefore, a common dynamic balance test platform comprises a power bench, a rotor wing installation assembly, a power driving mechanism, a sensor, an upper computer and the like. During testing, the blades are mounted at the driving end of a power driving mechanism, such as a motor shaft, through the rotor wing mounting assembly, and are rotated through the power driving mechanism. The sensors such as a stress sensor and an angular displacement sensor which are arranged at specific positions can measure corresponding tension, azimuth angle and angular speed. The sensor sends the data sensed in the rotating state of the paddle to the upper computer, and the upper computer performs action balance analysis based on the sensed data. Therefore, the existing dynamic balance test platform is complex in design and large in size, is usually only applied to professional institutions or manufacturers, and is not suitable for common users.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a rotor dynamic balance tester which is suitable for common users, low in cost, convenient to use and simple to maintain.

In order to solve the technical problem, the invention provides a rotor dynamic balance tester, which comprises a support frame, a balance rod, a blade driving mechanism and a vibration detection mechanism, wherein the support frame comprises a support part and a first connecting part; the first end and the second end of the balancing rod are free ends, a second connecting part is arranged between the first end and the second end, and the first connecting part is rotationally connected with the second connecting part; the blade drive mechanism mounted at a first end of the balance bar, configured to drive rotation of a blade under test; and the vibration detection mechanism mounted at the second end of the balance bar and configured to sense vibration of the balance bar as the blade rotates.

Preferably, the bottom of the supporting part is a fixed seat, and the fixed seat is a stable structure with a counterweight at the bottom.

Preferably, the first connecting part is a supporting groove, and shaft holes are arranged on the groove edges on the two sides of the supporting groove; the second connecting portion of balancing pole include pivot mechanism, pivot mechanism rotates to be installed support on the shaft hole of groove limit in groove both sides.

Preferably, the balance bar further comprises: the sliding groove is formed in the balance rod in the axial direction; the sliding block is fixedly connected with the rotating shaft mechanism and matched with the sliding chute; and a slider fixing structure configured to fix the slider on the chute.

Preferably, the device further comprises a first driving mechanism, the body of the first driving mechanism is fixed on the balance bar or the supporting frame, and the driving end of the first driving mechanism is connected with the sliding block or the balance bar.

Preferably, the balance adjusting mechanism further comprises a threaded sleeve or a slidable counterweight, correspondingly, an external thread or a sliding groove is arranged on the outer surface of one side, close to the vibration detecting mechanism, of the balance bar, and the threaded sleeve is mounted on the balance bar along the thread or the slidable counterweight is mounted on the balance bar along the sliding groove.

Preferably, the balance adjusting mechanism further comprises a second driving mechanism, a body of the second driving mechanism is fixed on the balance bar or the support frame, and a driving end of the second driving mechanism is connected with the threaded sleeve or the slidable counterweight.

Preferably, the paddle drive mechanism comprises: a drive motor mounted at a first end of the balance bar; and a blade fixing device installed on a motor shaft of the driving motor.

Preferably, the blade fixing device includes: the first end of the fixed sleeve is sleeved on a motor shaft of the driving motor and locked; the fixing piece is movably connected with the second end of the fixing sleeve and used for fixing the paddle on the second end of the fixing sleeve during testing.

Preferably, the vibration detection mechanism includes: a vibration sensor; and the first end of the supporting rod is coaxially connected with the second end of the balancing rod, and the vibration sensor is arranged at the second end of the supporting rod.

Preferably, the vibration detection mechanism further comprises an indicating device electrically connected to the vibration sensor.

Preferably, the blade drive mechanism further comprises an electrical box mounted within the support frame, having a power supply and control circuitry built therein, configured to provide at least control signals to the blade drive mechanism at the time of testing.

Preferably, the control circuit further comprises one or more of the following units:

a vibration data recording unit configured to receive and record vibration data sensed by the vibration detection mechanism;

the wireless data transmission unit transmits data or instructions with a remote control device based on the wireless data transmission unit; and

a balance control unit configured to output a movement control command to the first driving mechanism or the second driving mechanism.

Preferably, the power supply is one or more of a battery, a hand-operated power generation device and a solar battery assembly.

The invention utilizes the balance principle of the lever to carry out dynamic balance test on the paddle, can accurately test the dynamic unbalance phenomenon of the paddle, has small volume, light weight, low cost, convenient installation and simple maintenance and is suitable for common users of aircrafts.

Drawings

Preferred embodiments of the present invention will be described in further detail below with reference to the attached drawing figures, wherein:

fig. 1 is a schematic structural diagram of a rotor dynamic balance tester according to a first embodiment of the invention;

fig. 2A is a schematic structural diagram of a rotor dynamic balance tester according to a second embodiment of the present invention;

fig. 2B is a schematic side view of a supporting frame of a rotor dynamic balance tester according to a second embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a balance bar portion of a rotor dynamic balance tester according to a third embodiment of the present invention;

fig. 4A is a schematic partial structure view of a second driving mechanism of a rotor dynamic balance tester according to a fourth embodiment of the present invention, which is a linear motor;

fig. 4B is a schematic partial structure view of a second driving mechanism of a rotor dynamic balance tester according to a fifth embodiment of the present invention, which is a general motor;

figure 4C is a schematic diagram of a portion of a second drive mechanism of a rotor dynamic balance tester according to a sixth embodiment of the present invention;

figure 4D is a schematic diagram of a portion of a first drive mechanism of a rotor dynamic balance tester, in accordance with a seventh embodiment of the present invention;

FIG. 4E is a schematic diagram of a double pole double throw switch configuration of a balanced detection switch according to one embodiment of the present invention;

FIG. 5 is a schematic view of a rotor dynamic balance tester blade drive configuration according to one embodiment of the present invention;

figure 6 is a schematic view of a rotor dynamic balance tester with blades attached according to an embodiment of the present invention;

figure 7 is a functional block diagram of the electrical portion of a rotor dynamic balance tester in accordance with one embodiment of the present invention;

FIG. 8 is an electrical schematic block diagram of a dynamic balance tester according to another embodiment of the present invention;

FIG. 9 is a flow chart of a rotor dynamic balance tester installing a blade under test according to an embodiment of the present invention; and

figure 10 is a flow chart of the operation of a rotor dynamic balance tester according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following detailed description, reference is made to the accompanying drawings that form a part hereof and in which is shown by way of illustration specific embodiments in which the application may be practiced. In the drawings, like numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized and structural, logical or electrical changes may be made to the embodiments of the present application.

Due to the development of the technology, various rotor type aircrafts such as unmanned planes are more and more popular in application, and users of the aircrafts are widely distributed in various industries. The problem of flight performance, operation quality decline often can appear in the use in aircrafts such as unmanned aerial vehicle. The rotor wing is likely to generate dynamic unbalance phenomena in use for various reasons, and the dynamic unbalance phenomena can cause the reduction of flight performance and operation quality. Thus, a dynamic balance test is typically required for the rotor during troubleshooting. For a common user, the conventional dynamic balance test bench has high cost, needs a special warehouse for placement due to large volume and large floor area, and has high storage and maintenance costs. Aiming at the situation, the invention provides the rotor wing dynamic balance tester which is suitable for common users, and has the advantages of low cost, convenient use and simple maintenance.

The principle of the rotor dynamic balance tester provided by the invention is as follows: on the premise that the balance bar is in a balanced state, if the working state of the blade is intact and the generated aerodynamic force is not different, the vibration of the balance bar cannot be caused when the blade rotates; on the contrary, if the blade has problems such as twisting or even breakage, the difference in aerodynamic force generated during rotation is large, which may cause the stabilizer bar to vibrate. Therefore, whether the currently tested paddle can work normally or not can be determined by monitoring the vibration condition of the balance bar.

Structural embodiment 1

Fig. 1 is a schematic structural diagram of a rotor dynamic balance tester according to a first embodiment of the present invention. In the present embodiment, the rotor dynamic balance tester includes a support frame 1a, a balance bar 2a, a blade driving mechanism 3a, and a vibration detection mechanism 4a, wherein the support frame 1a includes a support portion 11a and a first connection portion (not shown in the figure); the first end and the second end of the balancing rod 2a are free ends, a second connecting part 21a is arranged between the first end and the second end, and the first connecting part on the supporting frame 1a is rotatably connected with the second connecting part 21 a. In this embodiment, the first connecting portion 12a and the second connecting portion 21a are both shaft holes, and are connected by the rotating shaft 5a, so that two ends of the balance bar 2a can freely move up and down with the rotating shaft 5a as a fulcrum, or the balance bar 2a is provided with the rotating shaft 5a integrated with the balance bar, and then two ends of the rotating shaft 5a are fixed on the supporting frame 1 a. A paddle drive mechanism 3a is mounted at a first end of the balance bar 2a for driving the paddle 6a to rotate during testing. A vibration sensing mechanism 4a is mounted at the second end of the balance bar 2a and senses the vibration of the balance bar as the blade rotates. In this embodiment, depending on the particular blade 6a under test, the balance bar 2a is in a balanced state after all devices have been installed, or a counterweight is provided at the vibration detecting mechanism 4a, and the balance bar 2a is in a balanced state after installation. At this time, the paddle drive mechanism 3a may be controlled to rotate the paddle 6a, and if the state of the paddle 6a is abnormal, the rotation of the paddle 6a may cause the balance bar 2a to vibrate, and the sensor provided in the vibration detection mechanism 4a at the other end may detect the vibration.

Structural example two

Fig. 2A is a schematic structural diagram of a rotor dynamic balance tester according to a second embodiment of the present invention. The rotor dynamic balance tester comprises a support frame 1, a balance rod 3, a blade driving mechanism and a vibration detection mechanism. Fig. 2B is a schematic side view of a support frame of a rotor dynamic balance tester according to a second embodiment of the present invention. In this embodiment, the supporting frame 1 includes two frame bodies or plate bodies 101 with triangular side surfaces, the top corner of the triangle is separately provided with a through hole 102, the top of the two plate bodies 101 forms a supporting groove on the side surface as a first connecting portion, and the through hole 102 is used as an axle hole on the side of the groove. The two frame bodies or plate bodies 101 can be covered on the side and top by connecting plates, a cavity is formed in the middle, the cavity can be used for installing electric elements, and the connection part can be subjected to waterproof treatment to adapt to the severe natural environment in the field. Or, two frame bodies or plate bodies 101 are connected by using the reinforcing ribs 103, and the electric element can be an independent electric box arranged between the plate bodies 101. The bottom of support frame 1 increases fixing base 14, because rotor dynamic balance tester can produce great vibration under operating condition, for increasing its steadiness, fixing base 14's bottom has set up the counter weight to make it form stable structure under operating condition, avoid toppling because of the vibration production, influence dynamic balance test. The first end and the second end of balancing pole 3 are free ends, be provided with the pivot mechanism as second connecting portion between first end and the second end, for example the through-hole has been seted up at the radial to the body of rod of balancing pole 3, sets up the bearing in the through-hole inside to cup joint a pivot through the bearing, the both ends of pivot are stretched out the through-hole, thereby constitute a pivot mechanism. And fixing the two ends of the rotating shaft on the shaft holes of the groove edges at the two sides of the supporting groove, so that the two ends of the balancing rod 3 can freely rotate around the rotating shaft.

The rotor dynamic balance tester in the embodiment can test various types of blades, and in order to maintain the balance rod 3 to be in a balance state when testing various types of blades, the embodiment further comprises a balance adjusting mechanism. Referring to fig. 2A, an external thread is provided on the outer surface of the side of the balancing pole 3 close to the vibration detecting structure, the threaded sleeve 5 is installed on the balancing pole 3 as a counterweight through a thread, and the position of the threaded sleeve 5 on the balancing pole 3 is changed by rotating the threaded sleeve 5, so that the balancing pole 3 can adapt to different types of paddles to obtain a balanced state, and the operation is simple and convenient. Similarly, the external thread may be replaced by a sliding groove or a sliding rail, and the thread sleeve may be replaced by a sliding weight, such as a sliding block with a certain weight, and may also serve to adjust the balance position of the balance bar 3.

Structural example III

The difference between this embodiment and the second embodiment is that this embodiment adopts another balance adjustment mechanism, as shown in fig. 3, and fig. 3 is a schematic structural diagram of a balance rod portion of a rotor dynamic balance tester according to a third embodiment of the present invention. The balance rod 3 further comprises a sliding groove 31, a sliding block 32 and a sliding block fixing structure 33. The sliding groove 31 is axially formed in the balance bar 3, and the sliding block 32 is fixedly connected with the rotating shaft mechanism 2 and is matched with the sliding groove 31, so that the sliding block can slide on the balance bar 3 along the sliding groove 31. The slider fixing structure 33 is used for fixing the slider 32. In this embodiment, the sliding block fixing structure 33 is, for example, a snap spring, which is installed in the sliding groove 31 of the balance bar 3 and fixes the sliding block 32 when the sliding block 32 moves to a proper position. In other embodiments, the slider fixing structure 33 can be designed as a screw structure or a snap structure. When the balance position of the balance bar 3 needs to be adjusted, the moving slider 32 moves along the slide groove 31 in the balance bar 3. When the supporting frame is fixed, the balance rod 3 moves left and right relative to the supporting frame, and when the balance rod 3 is balanced, the sliding block 32 is fixed in the sliding groove 31 through a sliding block fixing structure 33 such as a snap spring. The balance adjusting mechanism in the embodiment adjusts the balance position of the balance rod 3 by moving the fulcrum, and is simple and convenient to operate.

On the basis of the second and third embodiments, corresponding driving mechanisms can be added to the balance adjusting mechanisms respectively to realize automatic adjustment of the balance position of the balance bar 3. For example, in the second embodiment, the second driving mechanism is fixed on the balance bar 3 or on the support frame 1, and the driving end of the second driving mechanism is connected with the threaded sleeve 5 or the counterweight, and the threaded sleeve 5 is driven to rotate along the external thread on the balance bar or the slidable counterweight is driven to move in the sliding chute according to the received movement control command during the test process, so that the balance bar 3 is in a balanced state. In the third embodiment, the body of the first driving mechanism is fixed on the balance bar 3 or the support frame 1, the driving end of the first driving mechanism is connected with the sliding block 32 or the balance bar 3, and the first driving mechanism drives the sliding block 32 or the balance bar 3 to move according to the received movement control command.

Structural example four

As shown in fig. 4A, fig. 4A is a schematic partial structure diagram of a second driving mechanism of a rotor dynamic balance tester according to a fourth embodiment of the present invention, which is a linear motor. In this embodiment, the second driving mechanism is a linear motor 104 vertically disposed in the inner space of the supporting frame. The push rod of the linear motor 104 is connected with the first connecting rod 105 through a rotating shaft. The first connecting rod 105 and the second connecting rod 106 are connected through a rotating shaft, and the balance bar 3 is of a hollow tubular structure. Inside which a chute (not shown) and a slider 32 are provided. The slide 32 is rigidly connected to the second link 106. Under the driving of the linear motor 104, the first connecting rod 105 drives the second connecting rod 106 to reciprocate, and the first connecting rod 105 drives the sliding block 32 to balance in the sliding groove in the balance bar 3 to reciprocate. Since the slide groove and the slide block are arranged inside the side of the balance bar 3 close to the vibration detection mechanism in the embodiment, the balance state of the balance bar 3 is adjusted by changing the position of the slide block inside the balance bar 3 through the linear motor 104.

Structural example five

Fig. 4B is a partial schematic structural diagram of a general motor as the second driving mechanism of the rotor dynamic balance tester according to the fifth embodiment of the present invention, as shown in fig. 4B. The second driving mechanism is a common motor 107, and the axis of the motor shaft of the second driving mechanism is superposed with the rotating shaft 108 of the balancing pole 3 and is fixed on the supporting frame. The motor 107 drives a disc, and a connecting rod rotating shaft is fixed at the outer edge of the disc. When the motor 107 rotates, the disc is driven to rotate, the disc further drives the third connecting rod 109, the fourth connecting rod 110 and the fifth connecting rod 111 to reciprocate, and the fifth connecting rod 111 drives the sliding block 32 to reciprocate. In this embodiment, a sliding groove and a sliding block are provided on the outside of the side of the balance bar 3 close to the vibration detection mechanism, and the balance state of the balance bar 3 is adjusted by changing the position of the sliding block 32 on the balance bar 3 through the motor 107.

Structural example six

Fig. 4C is a partial schematic structural view of a second driving mechanism of a rotor dynamic balance tester according to a sixth embodiment of the present invention, as shown in fig. 4C. In this embodiment, the second drive mechanism of the present invention can adjust the position of the threaded sleeve 5 on the balance bar during blade testing. In this embodiment, the second driving mechanism is a linear motor, the threaded sleeve 5 or the counterweight sliding block is mounted outside an armature 51 of the linear motor, a permanent magnet stator 52 is arranged on the balance bar 3, a conductive sliding rail is mounted outside the stator 52, the sliding part of the linear motor is the armature 51, an electric brush is mounted inside the armature, and the electric brush is in contact with the conductive sliding rail. When the two ends of the balancing rod 3 are unbalanced, the armature 51 of the linear motor drives the threaded sleeve 5 or the counterweight sliding block which is integrally arranged with the armature to move left and right on the balancing rod 3, so that the balance state of the balancing rod 3 can be adjusted.

In addition, the motor in this embodiment may also be a rotary motor, such as a through-lead screw motor, and a corresponding transmission mechanism may be added at this time, and the balance state of the balance bar 3 may also be adjusted like a lead screw.

Structural example seven

Fig. 4D is a partial schematic structural diagram of a first driving mechanism of a rotor dynamic balance tester according to a seventh embodiment of the present invention, as shown in fig. 4D. In this embodiment, the first driving mechanism is a linear motor 301a vertically disposed in the inner space of the supporting frame. The push rod of the linear motor 301a is connected with the connecting rod 302a through a rotating shaft, and the pushing end of the connecting rod 302a is connected with the fixed seat 303a on the balancing pole 3 through a rotating shaft. When the two ends of the balance bar 3 are unbalanced, if the left end is high and the right end is low, the linear motor 301a moves upwards, the balance bar 3 is pushed to move leftwards through the connecting rod 302a, the moment on the left side of the fulcrum is increased, the left end is downward, the right end is upward, and the linear motor 301a stops moving until the balance bar 3 is balanced. Of course, the first driving mechanism may also adopt a common motor, which uses a gear as a transmission mechanism, and a rack is arranged on the balancing rod 3, and the balancing rod 3 can be moved left and right in the horizontal direction to achieve a balanced state.

As shown in fig. 4E, fig. 4E is a schematic diagram of a double-pole double-throw switch structure of the balanced detection switch according to an embodiment of the invention. In the above structural embodiments four to seven, the motor (linear motor or ordinary rotary motor) as the drive mechanism may be controlled in its operating state by the balance detection switch of the present embodiment. In this embodiment, the balance detecting switch is a double pole double throw switch and is mounted on the balance bar 3. The fixed ends of the

knife blades

53 and 54 of the two switches are respectively connected to the positive pole and the negative pole of a power supply, each switch comprises two equipment connecting ends (terminals 1 and 2) and a power-off end NC, the two

equipment connecting terminals

1 and 2 of the first switch are respectively connected with the positive pole and the negative pole of the motor, and the two

equipment connecting terminals

1 and 2 of the second switch are respectively connected with the negative pole and the positive pole of the motor. When the balance bar 3 is in a balanced state, the movable ends of the

knife blades

53 and 54 of the two switches are connected with the power-off end NC, and the motor is in a power-off state. When the balance bar 3 is deflected to one side, the movable ends of the

blades

53 and 54 are respectively connected to the terminals 1, the motor is operated, and the balance bar 3 is made to approach balance by controlling the movement of the slider (see fig. 4A and 4B) or the armature of the motor (see fig. 4C) or the balance bar (see fig. 4D). When the balance bar 3 is balanced, the movable ends of the

knife blades

53 and 54 of the two switches are connected with the power-off end NC, and the motor is powered off and stops moving. In this embodiment, the balance position of the balance bar 3 can be automatically adjusted by the first and second driving mechanisms through the balance detection switch, and manual adjustment operation is not required.

The blade driving mechanism and the vibration detecting mechanism in each of the above embodiments are explained below as follows:

taking fig. 2A as an example, the vibration detection mechanism is mounted at the second end of the stabilizer bar 3 and is used for sensing the vibration of the stabilizer bar 3 when the blade is subjected to a rotation test. The vibration detection mechanism includes a vibration sensor 12 and a support rod 11. The first end of the supporting rod 11 is coaxially connected with the second end of the balancing rod 3, and the vibration sensor 12 is installed at the second end of the supporting rod 11. In an application scenario, the vibration sensor 12 senses the vibration force generated by the blade in the test process, converts the parameter into an electric signal, and transmits the sensing result to an electric device for displaying and recording after the electric signal is amplified by an electronic circuit. In another application scenario, the vibration detection mechanism further comprises an indication device 13, and the indication device 13 is electrically connected with the vibration sensor 12. When the vibration sensor 12 senses vibration, the circuit of the indicating device 13 can be started to work. In this embodiment, the indicating device 13 is an indicator light, and when the rotation of the paddle causes vibration, the vibration sensor 12 switches on an indicator light circuit, and the indicator light is turned on, so that an operator can observe the test result more intuitively. In other embodiments, the indication device 13 may be a buzzer, which is activated to sound when the vibration sensor 12 senses the vibration.

Figure 5 is a schematic diagram of a rotor dynamic balance tester blade drive configuration according to one embodiment of the present invention. In this embodiment, the paddle drive mechanism is mounted at a first end of the balance bar 3 and is used to drive the paddle 9 to rotate during testing. The paddle drive mechanism comprises a drive motor 4 and a paddle fixing device.

In this embodiment, the paddle drive mechanism further includes a motor base, the motor base includes a first end 6 and a second end 7 which are coaxial, the first end 6 is coaxially and fixedly connected with the drive motor 4, and the second end 7 of the motor base is an open end, and the diameter of the open end is slightly larger than that of the balance bar 3. The balance bar 3 is sleeved with the first end of the balance bar and locked in a screw or thread mode, and therefore loosening of the balance bar in the test process is avoided. In addition, the balance bar is also conveniently detached from the balance bar 3 in a screw or thread mode, so that the balance bar can be conveniently stored and tidied in a split mode. In this embodiment, the motor base is an integrally formed structure, and in other embodiments, a split design may be adopted as required.

The blade fixing device comprises a fixing sleeve 8 and a fixing piece 10. Fixed cover 8 includes coaxial first end and second end, the first end of fixed cover 8 cup joints on driving motor 4's the motor shaft and through the mode locking of screw or screw thread, avoid it to loosen in the test procedure. The fixing piece 10 is movably connected with the second end of the fixing sleeve 8 and used for fixing the paddle 9 on the second end of the fixing sleeve 8 during testing. It should be noted that in this embodiment, the fixing manner of the paddle 9 and the fixing member 10 is implemented by a threaded manner, and in other embodiments, the fixing manner may be implemented by a snap-fit manner or the like as required.

Fig. 6 is a schematic structural diagram of a rotor dynamic balance tester according to an embodiment of the present invention, shown in fig. 6, in a blade-mounted state. In this embodiment, the fixing member 10 is a fixing bolt, the first end of the fixing sleeve 8 is provided with a connecting thread, the second end of the fixing sleeve 8 is provided with a threaded hole, the first end of the fixing sleeve 8 is connected to the motor shaft of the driving motor 4 in a threaded manner, and the fixing sleeve is locked by a screw. Before testing, the mounting hole on the blade is opposite to the threaded hole at the second end of the fixing sleeve 8, and then the fixing bolt serving as a fixing piece is screwed into the threaded hole at the second end of the fixing sleeve 8, so that the blade 9 is mounted on the driving motor 4.

In order to realize the control of the dynamic balance tester, the invention also comprises an electrical part. As described in the second embodiment, the electrical parts can be installed in the cavity inside the supporting frame 1, for example, the electrical components are all disposed on a circuit board, the control keys are installed outside the supporting frame 1 for operation, and are electrically connected with the relevant components on the circuit through wires. It is also possible to arrange all electrical components in an electrical box, which is mounted in place inside or outside the support frame 1.

A functional block diagram of the electrical portion of the present invention is shown in fig. 7, and includes a power supply 151, a control circuit 152, and an interactive interface 153. The power supply 151 may be one or more of a battery, a hand generator, and a solar cell module as required. The control circuit 152 may have different circuit compositions according to the structure and control requirements of the dynamic balance tester.

Corresponding to the first, second and third structural embodiments, the element to be controlled is a driving motor in the blade driving mechanism, and therefore, the control circuit 152 in this embodiment includes a motor control unit 1521 in fig. 7, which is a common power circuit when the rotation speed of the motor does not need to be adjusted, the driving motor in this embodiment is a dc motor, and the motor control circuit can be obtained by connecting a start-stop button and a fuse in series in the power circuit. During testing, the start button is pressed to turn on the power supply of the DC motor. When the test is stopped, a stop button is pressed to cut off the power supply of the direct current motor. Of course, a motor speed regulating module can be added to control the rotating speed of the motor.

In a further scheme, vibration data of a vibration sensor in the vibration detection mechanism can be acquired, and therefore, a vibration data recording unit 1522 in fig. 7 can be further included. The vibration data recording unit 1522 receives and records vibration data sensed by the vibration detection mechanism. In one embodiment, the vibration data recording unit 1522 can be implemented as a microprocessor, one input of which is electrically connected to the vibration sensor through a wire, so as to receive the vibration signal from the vibration sensor, and the vibration signal is processed, converted into amplitude, and stored in the memory.

Corresponding to the fourth to seventh structural embodiments, in order to achieve the automatic leveling of the balance bar, the balance control unit 1523 may be further included in the control circuit, and is configured to output a movement control command to the first driving mechanism or the second driving mechanism. Since the amount of movement of the slider and the like needs to be precisely adjusted, in an embodiment, the balance control unit 1523 may be implemented as a microprocessor, for example, the same microprocessor as the aforementioned vibration data recording unit 1522 is used, one output end of the microprocessor is used as a control end of the driving mechanism, and the purpose of precisely controlling the movement step length of the slider, the threaded sleeve and the like is achieved by outputting a corresponding control signal to the driving mechanism. In other embodiments, the balancing control unit 1523 may be a simple drive mechanism power control circuit. The user inputs a control command through an interactive interface (for example, a key on a control panel), so that the power supply of the driving mechanism is switched on, the driving mechanism works, whether the balance bar is balanced or not is observed artificially, and the driving mechanism is powered off when the balance bar is balanced, so that the driving mechanism stops working.

Further, in some embodiments, a wireless data transmission unit 1524 may be further included, and data or instructions are transmitted to the remote control device based on the wireless data transmission unit 1524, for example, a motor start-stop instruction of the remote control device is received, vibration data is transmitted to the remote control device, and the like.

The interactive interface 153 may have various embodiments, such as a control panel including only start-stop buttons, a touch screen for inputting instructions and data, displaying data, or a remote controller.

FIG. 8 is an electrical schematic block diagram of a dynamic balance tester according to another embodiment of the present invention. In this embodiment, a microprocessor U1 is included, to which is connected a wireless transmission circuit U2. The input end of the microprocessor U1 is respectively connected with the vibration sensor S1 and the control panel U3, and the output end of the microprocessor U1 respectively outputs control signals to the blade driving motor and the first driving mechanism or the second driving mechanism for adjusting the balance bar. An operator can input a control command of the blade driving motor and a control command of the first driving mechanism or the second driving mechanism through the control panel U3. After receiving the control command, the microprocessor U1 generates control information according to the specific content of the command, such as speed, steering, etc., and sends out a corresponding control signal through the output end. The microprocessor U1 receives the sensor signal from the vibration sensor S1, converts it to vibration data in a corresponding format and stores it in memory. The microprocessor U1 may transmit vibration data to the remote control device D1 via the wireless transmission circuit U2 as needed. The wireless transmission circuit U2 may be a short-distance transmission circuit, such as a bluetooth, wireless broadband (Wi-Fi), zigbee-be, or the like circuit, and a long-distance transmission circuit, such as a GPRS/CDMA or the like wireless communication circuit. In addition, when the balance bar is mounted with the balance sensor S2, the balance sensor S2 is connected to one input terminal of the microprocessor U1. The microprocessor U1 determines whether it is necessary to generate a control signal for the first driving mechanism or the second driving mechanism according to the signal of the balance sensor S2 so that the balance state of the balance bar can be automatically adjusted.

The control of the dynamic balance tester can be performed by an operator locally through a control panel or remotely through a remote control device D1. The remote control device D1 is, for example, a mobile terminal or a remote controller, and a control program is installed in the mobile terminal, and remote control is performed by operating the control program.

Figure 9 is a flow chart illustrating the operation of a rotor dynamic balance tester to install a blade under test according to one embodiment of the present invention. Referring to fig. 6, the steps for mounting the blade under test are as follows:

step S11, unscrewing the fixing element 10 from the fixing sleeve 8.

Step S12, the paddle 9 is sleeved on the fixing member 10.

Step S13, screwing the fixing element 10 into the threaded hole of the fixing sleeve 8 and screwing the fixing element 10, so that the fixing element 10 firmly fixes the blade 9.

As can be seen from the above description, the installation method of the blade provided by the invention is simple and convenient to operate and is firm in fixation.

In this embodiment, the test operation steps of the rotor dynamic balance tester are as follows:

and step S1, mounting the tested blade. The detailed steps are as described in fig. 9, and are not described herein again.

And step S2, adjusting the balance bar to be in a balance state. When the rotor dynamic balance tester is configured as shown in fig. 2A, 3, and 4A-4D, it is manually adjusted. If the balance detection switch of the structure shown in fig. 4E is added to the structure of fig. 4A to 4D, automatic adjustment is possible. When the balance control unit 1523 and the corresponding interface 153 are included in the control circuit, the balance state of the balance bar can be adjusted locally or remotely through the interface 153.

In step S3, the drive motor is turned on to rotate the paddle. And a control switch of the driving motor is switched on, so that the paddle rotates under the driving of the motor.

In step S4, it is determined whether the pointing device is activated. If the indicating device is not triggered, such as the indicator light is not on, or the buzzer does not sound, indicating that the blade is rotating without vibrating the balance bar, the blade is determined to be normal in step S5 and may be used for flying, and the work flow is ended. If the indicator lamp is lit or the buzzer sounds, it is determined at step S6 that the blade is abnormal and cannot be used for flight, and then the present work flow is ended.

The invention adopts the balance principle of the lever to realize simple and quick test of the rotor wing. The invention has simple structure and ideal integral test effect, can meet the requirement of simply and quickly testing the rotor wing under the field condition, and can be made into large equipment meeting the test requirement of large blades. For common users, the existing dynamic balance test bench has high cost, needs a special warehouse for placement due to large volume and large floor area, and has high storage and maintenance costs.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention, and therefore, all equivalent technical solutions should fall within the scope of the present invention.

Claims

1. A rotor dynamic balance tester, comprising:

a support frame including a support portion and a first connection portion;

the balance rod is provided with a first end and a second end which are free ends, a second connecting part is arranged between the first end and the second end, and the first connecting part is rotationally connected with the second connecting part;

a blade drive mechanism mounted at a first end of the balance bar configured to drive rotation of a blade under test; and

a vibration detection mechanism mounted at the second end of the balance bar configured to sense vibration of the balance bar as the blade rotates.

2. The rotor dynamic balance tester according to claim 1, wherein the bottom of the support portion is a fixed base, the fixed base being a stable structure with a counterweight at the bottom.

3. The rotor wing dynamic balance tester according to claim 1, wherein the first connection portion is a support groove, and shaft holes are formed in the groove edges of the two sides of the support groove; the second connecting portion of balancing pole include pivot mechanism, pivot mechanism rotates to be installed support on the shaft hole of groove limit in groove both sides.

4. The rotor dynamic balance tester of claim 3, wherein the balance bar further comprises thereon:

the sliding groove is formed in the balance rod in the axial direction;

the sliding block is fixedly connected with the rotating shaft mechanism and matched with the sliding groove; and

a slider securing structure configured to secure the slider on the chute.

5. The rotary wing dynamic balance tester of claim 4, further comprising a first drive mechanism having a body secured to the balance bar or support bracket and a drive end coupled to the slider or balance bar.

6. The rotor dynamic balance tester according to claim 1, further comprising a balance adjustment mechanism including a threaded sleeve or a slidable weight, and correspondingly, an external thread or a sliding groove is provided on an outer surface of the balancing rod on a side close to the vibration detection mechanism, and the threaded sleeve is mounted on the balancing rod along the thread or the slidable weight is mounted on the balancing rod along the sliding groove.

7. The rotary wing dynamic balance tester according to claim 6, wherein the balance adjustment mechanism further comprises a second drive mechanism having a body fixed to the balance bar or support bracket and a drive end connected to the threaded bushing or slidable weight.

8. The rotor dynamic balance tester according to claim 5 or 7, wherein the first or second drive mechanism is a motor; further comprises a balance detection switch mounted on the balance bar; the balance detection switch is connected in a power supply circuit of the motor, and the power supply circuit of the motor is switched on when the balance rod is unbalanced, so that the motor runs; and when the balance rod is balanced, the power supply circuit of the motor is disconnected, so that the motor stops running.

9. The rotor dynamic balance tester of claim 1, wherein the blade drive mechanism comprises:

a drive motor mounted at a first end of the balance bar; and

and the blade fixing device is arranged on a motor shaft of the driving motor.

10. The rotor dynamic balance tester of claim 9, wherein the blade fixture comprises:

the fixing sleeve comprises a first end and a second end which are coaxial, and the first end of the fixing sleeve is sleeved on a motor shaft of the driving motor and locked; and

and the fixing piece is movably connected with the second end of the fixing sleeve and used for fixing the paddle on the second end of the fixing sleeve during testing.

11. The rotor dynamic balance tester of claim 1, wherein the vibration detection mechanism comprises:

a vibration sensor; and

the first end of the supporting rod is coaxially connected with the second end of the balancing rod, and the vibration sensor is installed at the second end of the supporting rod.

12. The rotor dynamic balance tester according to claim 11, wherein the vibration detection mechanism further comprises an indicating device electrically connected to the vibration sensor.

13. The rotor dynamic balance tester according to any one of claims 1-12 or further comprising an electrical box mounted within the support frame having a power supply and control circuitry disposed therein and configured to provide at least control signals to the blade drive mechanism during testing.

14. The rotor dynamic balance tester of claim 13, wherein the control circuit further comprises one or more of the following:

and the balance control unit is configured to output a movement control command to the first driving mechanism or the second driving mechanism so as to control the balance rod to be in a balance state.

15. The rotary wing dynamic balance tester of claim 14, the power supply being one or more of a battery, a hand generator, a solar module.