Transmission experiment system for helicopter

Abstract

The invention relates to the field of experimental equipment, in particular to a transmission experimental system for a helicopter, which comprises a transmission shaft rack, a transmission shaft, a main base, a transverse guide rail, a plurality of target equipment, a transverse driving assembly, a grating ruler, a hydraulic lock and an alignment control unit, when the target equipment is switched and aligned, the hydraulic lock is firstly controlled to loosen the transition plate, the transverse driving assembly is used for driving the transition plate and the target equipment to run along the transverse guide rail, the grating ruler is used for collecting the current position of the target equipment, and alignment control is executed according to the current position and the target position of the target equipment. The automatic control technology is utilized, automatic alignment of the transmission shaft of the helicopter experiment platform can be achieved, efficiency is high, accuracy is higher, and the static mode and the dynamic mode of the helicopter experiment platform can be met.

Description

Technical Field

[0001] The invention relates to the field of experimental equipment, in particular to a transmission experimental system for a helicopter. Background Art

[0002] In traditional helicopters, the tail rotor is mainly driven by a mechanical transmission system. This system usually consists of an intermediate reducer, a tail reducer, a tail drive shaft assembly, etc. The output power of the main reducer tail drive is transmitted to the intermediate reducer through the tail horizontal shaft assembly, and after deceleration and reversing, it is transmitted to the tail reducer through the tail oblique shaft assembly, and finally drives the tail propeller to work.

[0003] In order to experiment with the helicopter transmission system, a test bench is generally built in the prior art. In order to meet different test projects, the test bench needs to be divided into static mode and dynamic mode. In static mode, the drive motor is disconnected from the transmission system to carry out system installation process technology research, as well as training related to installation process methods and maintenance operations. In dynamic mode, the drive motor is connected to the transmission system to conduct various dynamic mode experiments. Since the motor needs to be disconnected and connected to the transmission system, it is necessary to align the motor output shaft with the transmission shaft. In the prior art, manual alignment is generally used, which has low alignment efficiency and poor accuracy. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a transmission test system for a helicopter to solve the problem of low efficiency and poor precision when manually aligning the transmission shaft and the motor output shaft on the existing test bench.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A transmission experiment system for a helicopter of the present invention comprises: a transmission shaft stand, a transmission shaft, a main base, a transverse guide rail, a plurality of target devices, a transverse drive assembly, a grating ruler, a hydraulic lock and an alignment control unit;

[0007] The transmission shaft is arranged on the transmission shaft stand; the main base is located at one end of the transmission shaft stand, the transverse guide rail is arranged on the main base, and the transmission shaft is perpendicular to the transverse guide rail;

[0008] The plurality of target devices are fixed on a transition plate, the transition plate cooperates with the transverse guide rail, and the transverse drive assembly is connected to the transition plate to drive the target devices to move along the transverse guide rail; the main body of the hydraulic lock is fixed on the transition plate, and the hydraulic lock is used to lock or release with the transverse guide rail based on internal hydraulic pressure;

[0009] The scale grating of the grating ruler is arranged on the transverse guide rail, and the grating reading head of the grating ruler is arranged on the transition plate. The grating ruler is used to collect the current position of the output shaft of the target device;

[0010] The alignment control unit is used to control the hydraulic lock to release based on an externally input target device switching instruction, and control the transverse drive assembly based on the current position and the target position of the output shaft of the target device, so as to align the output shaft of the target device with the transmission shaft.

[0011] In an embodiment of the present application, controlling the transverse drive assembly based on the current position and the target position of the output shaft of the target device to align the output shaft of the target device with the transmission shaft includes:

[0012] Calculating the current position D of the output shaft of the target device now and the target position D of the output shaft of the target device target of the difference D target -D now ;

[0013] Comparing the difference D target -D now with a preset first distance threshold D1, a second distance threshold D2, and a third distance threshold D3;

[0014] When D target -D now ≥D1, controlling the movement of the transverse drive assembly based on a pre-configured first speed level V1;

[0015] When D1>D target -D now ≥D2, controlling the movement of the transverse drive assembly based on a pre-configured second speed level V2, where V1>V2;

[0016] When D target -D now <D2, controlling the movement of the transverse drive assembly based on a pre-configured third speed level V3, where V2>V3;

[0017] When |D target -D now |≤D3, performing closed-loop control on the transverse drive assembly based on the current position D of the output shaft of the target device now and the target position D of the output shaft of the target device target so that the output shaft of the target device is aligned with the transmission shaft.

[0018] In an embodiment of the present application, the multiple target devices are a main reducer or a drive motor.

[0019] In one embodiment of the present application, the transition plate is provided with a longitudinal guide rail, the bottom of the main reducer is provided with a main reducer base, the bottom of the drive motor is provided with a drive motor base, and the main reducer base or the drive motor base cooperates with the longitudinal guide rail;

[0020] The transition plate is also provided with a manual drive component, which is used to drive the main reducer or the drive motor to slide along the longitudinal guide rail, so that when the output shaft of the main reducer or the output shaft of the drive motor is aligned with the transmission shaft, the output shaft of the main reducer is connected to the transmission shaft, or the output shaft of the drive motor is connected to the transmission shaft through the manual drive component.

[0021] In one embodiment of the present application, the lateral drive assembly includes a servo motor, a first worm gear reducer, a first lead screw and a first nut;

[0022] The first worm gear reducer is fixed to one side of the main base through a first reducer mounting seat, the servo motor is fixed to the input end of the first worm gear reducer, the output shaft of the servo motor is fixedly connected to the input shaft of the first worm gear reducer, one end of the first lead screw is fixedly connected to the output shaft of the worm gear reducer, and the other end of the first lead screw is rotatably connected to a distal support arranged on the other side of the main base;

[0023] The first nut cooperates with the first lead screw, a nut mounting plate is provided on the first nut, and the nut mounting plate is fixedly connected to the transition plate;

[0024] The servo motor is connected to the alignment control unit, and is used for forward or reverse transmission based on the control instruction of the alignment control unit to input the rotation amount into the first worm gear reducer, and the first worm gear reducer is used for driving the first screw after reducing the rotation amount to linearly drive the first nut and the target device on the transition plate.

[0025] In one embodiment of the present application, the hydraulic lock includes a hydraulic cylinder, a piston, a T-screw, a disc spring and a pre-tightening nut;

[0026] The hydraulic cylinder body is fixed on the transition plate;

[0027] The piston is arranged in the hydraulic cylinder body, the straight end of the T-screw is inserted into the piston and is threadedly connected with the threaded hole in the center of the piston, and the pre-tightening nut is fixed to the straight end of the T-screw to limit the piston in the straight end of the T-screw;

[0028] The transverse guide rail is provided with a T-shaped groove matching the T-shaped end of the T-shaped screw, and the T-shaped end of the T-shaped screw passes through the hydraulic cylinder body and cooperates with the T-shaped groove; the disc spring is sleeved in the middle of the T-shaped screw, the top end of the disc spring contacts the bottom of the piston, and the bottom end of the disc spring contacts the inner bottom surface of the hydraulic cylinder body;

[0029] A hydraulic input hole is provided on the top of the hydraulic cylinder body, and the hydraulic input hole is externally connected to a high-pressure oil pump. The high-pressure oil pump is connected to the alignment control unit and is used to input high pressure based on the control command of the alignment control unit to compress the disc spring to loosen the T-screw and the T-slot, or to release pressure based on the control command of the alignment control unit. The disc spring lifts the T-screw to lock the T-shaped end of the T-screw with the T-slot.

[0030] In one embodiment of the present application, the manual drive assembly includes a hand wheel, a second worm gear reducer, a second lead screw and a second nut;

[0031] The second worm gear reducer is fixed to the transition plate via a second reducer mounting seat;

[0032] The hand wheel is connected to the input shaft of the second worm gear reducer, one end of the second lead screw is connected to the output shaft of the second worm gear reducer, the second nut is matched with the second lead screw, and the second nut is fixed to the main reducer base or connected to the drive motor base;

[0033] The second worm gear reducer is used to reduce the rotation amount input by the hand wheel and transmit it to the second lead screw to linearly drive the second nut and the main reducer base, or linearly drive the second nut and the drive motor base.

[0034] In one embodiment of the present application, a guide rail protective cover is provided at the end of the transverse guide rail for limiting the transition plate and protecting the end of the transverse guide rail.

[0035] In an embodiment of the present application, the main reducer further includes an input shaft, and the main reducer inputs an external power source through the input shaft.

[0036] In one embodiment of the present application, a loading motor for simulating the tail rotor load of a helicopter is further provided at the end of the transmission shaft stand, and the loading motor is used to dock with the other end of the transmission shaft.

[0037] The beneficial effects of the present invention are as follows: a transmission test system for a helicopter of the present invention includes a transmission shaft stand, a transmission shaft, a main base, a transverse guide rail, multiple target devices, a transverse drive assembly, a grating ruler, a hydraulic lock, and an alignment control unit; when switching the target device and aligning, the present application first controls the hydraulic lock to loosen the transition plate, uses the transverse drive assembly to drive the transition plate and the target device to run along the transverse guide rail, and uses the grating ruler to collect the current position of the target device, and uses the current position and target position of the target device to perform alignment control. The present application utilizes automatic control technology to realize automatic alignment of the transmission shaft of the helicopter test platform, which is highly efficient and more accurate, and can meet the static mode and dynamic mode of the helicopter test platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0039] Figure 1 is a structural schematic diagram of a transmission experimental system for a helicopter shown in an embodiment of the present application;

[0040] Figure 2 is a schematic diagram of a top view of a transmission experimental system for a helicopter shown in an embodiment of the present application;

[0041] Figure 3 is a side structural schematic diagram of a transmission experimental system for a helicopter shown in an embodiment of the present application;

[0042] Figure 4 It is a schematic diagram of the structure of a grating scale for a transmission experimental system for a helicopter shown in an embodiment of the present application;

[0043] Figure 5 This is a schematic diagram of the structure of a hydraulic lock in an embodiment of the present application;

[0044] Figure 6 It is a schematic diagram of the structure of a lateral drive assembly and a manual drive assembly in one embodiment of the present application;

[0045] Figure 7 It is a partially enlarged schematic diagram of a transverse driving assembly in an embodiment of the present application;

[0046] Figure 8 It is a partially enlarged schematic diagram of a manual driving component in an embodiment of the present application;

[0047] The reference numerals are as follows:

[0048] 1- Transmission shaft stand;

[0049] 2-transmission shaft, 201-middle reducer, 202-rear reducer;

[0050] 3- Main base;

[0051] 4- transverse guide rail, 401- protective cover;

[0052] 5-driving motor, 501-driving motor base;

[0053] 6- Loading end motor;

[0054] 7-lateral drive assembly, 701-servo motor, 702-first worm gear reducer, 703-first lead screw, 704-first nut;

[0055] 8-hydraulic lock, 801-hydraulic cylinder, 802-piston, 803-T-screw, 804-disc spring, 805-preload nut;

[0056] 9- Main reduction base;

[0057] 10-overboard;

[0058] 11- longitudinal guide rail;

[0059] 12-manual drive assembly, 1201-hand wheel, 1202-second worm gear reducer, 1203-second lead screw, 1204-second nut, 1205-clamping bolt;

[0060] 13-grating ruler, 1301-scale grating, 1302-reading head. DETAILED DESCRIPTION

[0061] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0062] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show the layers related to the present invention rather than being drawn according to the number, shape and size of the layers in actual implementation. In actual implementation, the type, quantity and proportion of each layer may be changed arbitrarily, and the layer layout may also be more complicated.

[0063] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0064] Figure 1FIG. 1 is a structural diagram of a transmission experimental system for a helicopter shown in an embodiment of the present application. Figure 1 As shown: A transmission test system for a helicopter in this embodiment adopts a modular structure similar to the helicopter fuselage. The dynamometer motors at both ends simulate the engine and tail rotor loads of the helicopter respectively. The electricity generated by the loading end motor 6 is used for the energy input of the driving end motor through the common DC bus technology to realize the closed cycle of electric energy. The test bench is mainly used to carry out relevant experiments on the process technology research of the helicopter tail transmission system.

[0065] The driving motor 5 can accurately simulate the combined output characteristics of the helicopter engine and the main reducer, and has a torsional vibration output function. The loading end motor 6 can simulate various resistance loads of the helicopter tail rotor in flight and can also apply torsional vibration loads. The main base 3 of the test bench is fixed to the iron floor of the test room by T-bolts. It has high rigidity and low vibration, which minimizes the influence of the test bench's own structure on the test results.

[0066] Specifically, the present application includes a transmission shaft stand 1, a transmission shaft 2, a main base 3, a transverse guide rail 4, multiple target devices, a transverse drive assembly 7, a grating ruler 12, a hydraulic lock 8 and an alignment control unit; the multiple target devices in the present application mainly include a main reducer and a drive motor 5. Among them, the drawings only show the main reducer base 9 for installing the main reducer.

[0067] The transmission shaft 2 is arranged on the transmission shaft stand 1; the main base 3 is located at one end of the transmission shaft stand 1, the transverse guide rail 4 is arranged at the position of the main base 3, and the transmission shaft 2 is perpendicular to the transverse guide rail 4; one end of the transmission shaft 2 is located at one end of the transmission shaft stand 1, and one end of the transmission shaft 2 is located at the other end of the transmission shaft stand 1, and the other end of the transmission shaft stand 1 is provided with a loading motor simulating the tail rotor load of the helicopter. The loading motor can be connected or disconnected with the other end of the transmission shaft 2. In addition, the transmission shaft 2 is composed of multiple sections, the middle part is connected by a middle reducer, and the tail is also provided with a tail reducer.

[0068] Among them, the main reducer and the drive motor 5 are on the transition plate 10, the transition plate 10 cooperates with the transverse guide rail 4, and the transverse drive assembly 7 is connected to the transition plate to drive the main reducer and the drive motor 5 to move along the transverse guide rail 4; the main body of the hydraulic lock 8 is fixed on the transition plate 10, and the hydraulic lock 8 is used to lock or release with the transverse guide rail 4 based on the internal hydraulic pressure;

[0069] The hydraulic lock 8 adopts a normally closed structure, and when high pressure is input, the hydraulic lock 8 is opened to fix the transition plate 10, the main reducer and the drive motor 5 in one position of the transverse guide rail 4. After the high pressure is input, the hydraulic lock 8 is opened, and then the switching and alignment are performed.

[0070] A longitudinal guide rail 11 is provided on the transition plate 10, a main reducer base 9 is provided at the bottom of the main reducer, and a drive motor base 501 is provided at the bottom of the drive motor 5. The main reducer base 9 or the drive motor base 501 cooperates with the longitudinal guide rail 11;

[0071] Specifically, a manual drive assembly is also provided on the transition plate 10, and the manual drive assembly is used to drive the main reducer or the drive motor 5 to slide along the longitudinal guide rail 11, so that when the output shaft of the main reducer or the output shaft of the drive motor 5 is aligned with the transmission shaft 2, the output shaft of the main reducer is connected to the transmission shaft 2 through the manual drive assembly, or the output shaft of the drive motor 5 is connected to the transmission shaft 2. After the output shaft of the main reducer is aligned with the transmission shaft 2, the manual drive assembly can be used to bring the output shaft of the main reducer close to the transmission shaft 2, and the coupling can be used to connect them.

[0072] A driving motor base 501 is provided at the bottom of the driving motor 5, and the driving motor base 501 is fixedly arranged on the transition plate 10. The output shaft of the driving motor 5 is aligned with the transmission shaft 2 and connected using a coupling.

[0073] The scale grating 1201 of the grating ruler 12 is set on the transverse guide rail 4, and the grating reading head 1202 of the grating ruler 12 is set on the transition plate 10. The grating ruler 12 is used to collect the current position of the output shaft of the target device; before alignment, the output shaft of the drive motor 5 or the reducer is aligned with the transmission shaft 2, and the degree of the grating ruler 12 at this time is recorded, that is, the target value of the drive motor 5 or the reducer during alignment is obtained.

[0074] In order to achieve accurate automatic positioning of the power platform, a grating ruler 12 high-precision displacement sensor is used to calibrate and position the lateral movement of the power platform. The measurement accuracy of the grating ruler 12 can reach 0.0025mm. The displacement closed-loop control through the grating ruler 12 can ensure that the repeated positioning accuracy of the power platform is within 0.01mm.

[0075] The alignment control unit is used to control the hydraulic lock 8 to release based on the external input target device switching command, and control the lateral drive assembly 7 based on the current position and target position of the output shaft of the target device to align the output shaft of the target device with the transmission shaft 2.

[0076] In order to achieve accurate alignment and positioning, a grating ruler 12 is used to calibrate and position the lateral movement of the transition plate 10. The measurement accuracy of the grating ruler 12 can reach 0.0025mm. The displacement closed-loop control by the grating ruler 12 can ensure that the repeated positioning accuracy of the power platform is within 0.01mm. After the platform moves to the specified position, the normally closed hydraulic lock 8 is used to automatically lock and position.

[0077] When the test bench needs to switch between static mode and dynamic mode, the "automatic feed" button is selected by pressing the button on the on-site control computer (controller). The system will first pass oil to the hydraulic lock 8. When the oil pressure is detected to reach the preset value, the servo motor 701 is automatically started (otherwise the servo motor 701 cannot be started). At the same time, the current position of the platform is determined by the grating ruler 12 to determine whether the motor is forward or reverse. When the power platform moves horizontally to a position close to the target position, the servo motor 701 stops rotating, and the system automatically switches to the manual fine-tuning feed mode. The operator determines the remaining distance to be moved according to the position of the grating ruler 12 displayed on the screen, and controls the platform to slowly move to the set target position by controlling the manual fine-tuning button on the computer operation interface. After confirming that the power platform is in place, the oil circuit is automatically depressurized and the hydraulic lock 8 is locked.

[0078] A longitudinal guide rail 11 and a manual lead screw are installed along the longitudinal direction of the transition plate 10, and the drive motor base 501 is installed on the longitudinal guide rail 11. Shaking the hand wheel can drive the motor base 501 and the main reducer base 9 to move longitudinally on the guide rail, which is convenient for the alignment adjustment with the transmission shaft 2 when the test bench is installed. The longitudinal moving platform is limited by a mechanical stopper, and after the platform moves into place, the motor base and the main reducer base 9 are fixed to the longitudinal guide rail 11 by T-bolts.

[0079] Since the entire mobile platform is large in size, up to 1700mm, and the final position control accuracy needs to be 0.01mm, the control requirements are high, and the full-stroke moving time cannot be more than 5min, a multi-level speed and precision motion method is adopted for mobile control.

[0080] Specific alignment control methods include:

[0081] S1. Calculate the current position D of the output shaft of the target device now and the target position D of the output shaft of the target device target The difference D target -D now ;

[0082] S2, the difference D target -D now Compare with the preset first distance threshold D1, second distance threshold D2 and third distance threshold D3;

[0083] S2-1, in D target -D now ≥ D1, the lateral drive assembly 7 is controlled to move based on the pre-configured first speed level V1;

[0084] S2-2, when D1>D target -D nowWhen it is ≥ D2, control the movement of the lateral drive assembly 7 based on the pre-configured second speed level V2, where V1 > V2;

[0085] S2-3. At D target -D now When it is < D2, control the movement of the lateral drive assembly 7 based on the pre-configured third speed level V3, where V2 > V3;

[0086] S2-4. When |D target -D now | ≤ D3, perform closed-loop control on the lateral drive assembly 7 based on the current position D of the output shaft of the target device now and the target position D of the output shaft of the target device target so that the output shaft of the target device is aligned with the transmission shaft 2. Adopt a 4-fold frequency pulse signal amplification method to improve the accuracy, and adopt a host computer closed-loop method to achieve a final control accuracy within 0.01 mm. The host computer closed-loop uses the grating reading as the input quantity, controls the positive and negative pulse control of the servo driver, and gives the output to realize the forward and backward movement of the drive motor 5.

[0087] Figure 5 is a schematic structural diagram of a hydraulic lock in an embodiment of the present application. As Figure 5 shown, the hydraulic lock 8 includes a hydraulic cylinder body 801, a piston 802, a T-shaped screw 803, a disc spring 804, and a pre-tightening nut 805;

[0088] The hydraulic cylinder body 801 is fixed on the transition plate 10;

[0089] The piston 802 is arranged in the hydraulic cylinder body 801. The straight end of the T-shaped screw 803 passes through the piston 802 and is threadedly connected to the threaded hole in the center of the piston 802. The pre-tightening nut 805 is fixed to the straight end of the T-shaped screw 803 to limit the piston 802 at the straight end of the T-shaped screw 803;

[0090] A T-shaped chute matching the T-shaped end of the T-shaped screw 803 is provided in the lateral guide rail 4. The T-shaped end of the T-shaped screw 803 passes through the hydraulic cylinder body 801 and cooperates with the T-shaped chute; the disc spring 804 is sleeved on the middle of the T-shaped screw 803. The top end of the disc spring 804 contacts the bottom of the piston 802, and the bottom end of the disc spring 804 contacts the inner bottom surface of the hydraulic cylinder body 801;

[0091] A hydraulic input hole is provided on the top of the hydraulic cylinder body 801, and the hydraulic input hole is externally connected to a high-pressure oil pump. The high-pressure oil pump is connected to the alignment control unit and is used to input high pressure based on the control command of the alignment control unit to compress the disc spring 804 to loosen the T-screw 803 and the T-slot, or to release pressure based on the control command of the alignment control unit. The disc spring 804 lifts the T-screw 803 to lock the T-shaped end of the T-screw 803 with the T-slot.

[0092] In this application, each hydraulic lock 8 is correspondingly provided with a small high-pressure pump station for driving. A total of 6 hydraulic locks 8 are arranged on the power platform. Each hydraulic lock 8 is matched with 3 sets of disc springs 804, and each set of 3 disc springs 804 is overlapped. Detailed parameters are shown in the table below:

[0093] Table 1. Main technical parameters of hydraulic lock 8

[0094] Main parameters Numeric Cylinder diameter 80mm Disc spring 804 combination 3×3 involution Disc spring 804 preload 101kN Unlocking pressure 20.1MPa Unlock itinerary 2mm

[0095] The technical parameters of the high-pressure pump station used are shown in the following table:

[0096] Table 1. Technical parameters of electric high pressure oil pump

[0097]

[0098]

[0099] Figure 6 Schematic diagram of the structure of the lateral drive assembly and the manual drive assembly in one embodiment of the present application. Figure 7 FIG. 1 is a partially enlarged schematic diagram of a lateral drive assembly in an embodiment of the present application. Figure 6-Figure 7 As shown, the transverse drive assembly 7 includes a servo motor 701, a first worm gear reducer 702, a first lead screw 703 and a first nut 704;

[0100] The first worm gear reducer 702 is fixed to one side of the main base 3 through the first reducer mounting seat, the servo motor 701 is fixed to the input end of the first worm gear reducer 702, the output shaft of the servo motor 701 is fixedly connected to the input shaft of the first worm gear reducer 702, one end of the first lead screw 703 is fixedly connected to the output shaft of the worm gear reducer, and the other end of the first lead screw 703 is rotatably connected to the distal support arranged on the other side of the main base 3;

[0101] The first nut 704 cooperates with the first lead screw 703, and a nut mounting plate is provided on the first nut 704, and the nut mounting plate is fixedly connected to the transition plate 10;

[0102] The servo motor 701 is connected to the alignment control unit, and is used to forward or reverse based on the control command of the alignment control unit to input the rotation amount into the first worm gear reducer 702. The first worm gear reducer 702 is used to reduce the rotation amount and drive the first screw 703 to linearly drive the first nut 704 and the target device on the transition plate.

[0103] When performing alignment adjustment, the controller controls the servo motor 701 to rotate. After being decelerated by the first worm gear reducer 702, the rotation can be controlled more accurately, and then the first lead screw 703 is driven to rotate, converting the rotation amount into linear motion, thereby adjusting the position of the drive motor 5 or the main reducer on the transverse guide rail 4.

[0104] Figure 8 FIG. 1 is a partially enlarged schematic diagram of a manual drive assembly in an embodiment of the present application. Figure 6 and Figure 8 As shown, the manual drive assembly 12 includes a hand wheel 1201, a second worm gear reducer 1202, a second lead screw 1203 and a second nut 1204;

[0105] The second worm gear reducer is fixed on the transition plate 10 through a second reducer mounting seat;

[0106] The hand wheel 1201 is connected to the input shaft of the second worm gear reducer 1202, one end of the second lead screw 1203 is connected to the output shaft of the second worm gear reducer 1202, the second nut 1204 cooperates with the second lead screw 1203, and the second nut is fixed to the main reduction base 9 or connected to the drive motor base 501;

[0107] The second worm gear reducer 1202 is used to reduce the rotation input by the hand wheel 1201 and transmit it to the second lead screw 1203 to linearly drive the second nut and the main reduction base 9, or linearly drive the second nut and the drive motor base 501.

[0108] In addition, a clamping bolt is provided at the edge of the drive motor base 501 or the main reducer base 9. The upper part of the clamping bolt is provided with an external thread and an adjusting nut is sleeved thereon. The lower part of the clamping bolt is T-shaped, and a slide groove with a T-shaped cross-section is provided on the longitudinal guide rail 11. The lower part of the clamping bolt cooperates with the slide groove. After alignment through the manual drive assembly, the adjusting nut is turned to fix the drive motor base 501 or the main reducer base 9 at the corresponding position of the longitudinal guide rail 11.

[0109] The lateral drive assembly 7 and the manual drive assembly in this application both adopt a ball screw structure. The ball screw is a commonly used linear transmission mechanism with high precision and high reliability, and has high efficiency and low resistance. Therefore, the power platforms of the double-engine and triple-engine test benches in this scheme all adopt this mechanism for motion drive. The model and specifications of the screw are generally determined according to the working load and stroke of the screw. The working load is mainly the axial force of the screw. Here, the maximum friction force of the guide rail is used as the axial load. The specific calculation results are shown in the table below. The travel of the guide rail is required to be 1500mm horizontally and 200mm vertically.

[0110] Table 3. Calculation results of guide rail friction

[0111]

[0112] In one embodiment of the present application, a guide rail protective cover is provided at the end of the transverse guide rail 4 for limiting the transition plate 10 and protecting the end of the transverse guide rail 4 .

[0113] In one embodiment of the present application, the main reducer further includes an input shaft, and the external power source is input to the main reducer through the input shaft.

[0114] A transmission experiment system for a helicopter of the present invention comprises a transmission shaft stand 1, a transmission shaft 2, a main base 3, a transverse guide rail 4, a plurality of target devices, a transverse drive assembly 7, a grating ruler 12, a hydraulic lock 8 and an alignment control unit; when switching the target device and aligning, the present application first controls the hydraulic lock 8 to loosen the transition plate 10, uses the transverse drive assembly 7 to drive the transition plate 10 and the target device to run along the transverse guide rail 4, and uses the grating ruler 12 to collect the current position of the target device, and performs alignment control using the current position and the target position of the target device. The present application utilizes automatic control technology to realize automatic alignment of the transmission shaft 2 of the helicopter experimental platform, which is highly efficient and more accurate, and can meet the static mode and dynamic mode of the helicopter experimental platform.

[0115] In the above-mentioned embodiments, although the present invention has been described in conjunction with the specific embodiments of the present invention, many replacements, modifications and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. The embodiments of the present invention are intended to cover all such replacements, modifications and variations falling within the broad scope of the appended claims.

[0116] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A transmission test system for a helicopter, characterized in that: include: A transmission shaft stand (1), a transmission shaft (2), a main base (3), a transverse guide rail (4), a plurality of target devices, a transverse drive assembly (7), a grating scale (13), a hydraulic lock (8) and an alignment control unit; The transmission shaft (2) is arranged on the transmission shaft stand (1); the main base (3) is located at one end of the transmission shaft stand (1), the transverse guide rail (4) is arranged on the main base (3), and the transmission shaft (2) is perpendicular to the transverse guide rail (4); The plurality of target devices are fixed on a transition plate (10), the transition plate (10) cooperates with the transverse guide rail (4), and the transverse drive assembly (7) is connected to the transition plate to drive the target devices to move along the transverse guide rail (4); the main body of the hydraulic lock (8) is fixed on the transition plate (10), and the hydraulic lock (8) is used to lock or release with the transverse guide rail (4) based on internal hydraulic pressure; The scale grating (1301) of the grating ruler (13) is arranged on the transverse guide rail (4), the grating reading head (1302) of the grating ruler (13) is arranged on the transition plate (10), and the grating ruler (13) is used to collect the current position of the output shaft of the target device; The alignment control unit is used to control the hydraulic lock (8) to release based on an externally input target device switching instruction, and to control the lateral drive assembly (7) based on a current position and a target position of an output shaft of the target device so as to align the output shaft of the target device with the transmission shaft (2).

2. A transmission test system for a helicopter according to claim 1, characterized in that: Controlling the lateral drive assembly (7) based on the current position and the target position of the output shaft of the target device to align the output shaft of the target device with the transmission shaft (2) comprises: Calculate the current position D of the output shaft of the target device now and the target position D of the output shaft of the target device target The difference D target -D now ; The difference D target -D now Compare with the preset first distance threshold D1, second distance threshold D2 and third distance threshold D3; In D target -D now ≥ D1, controlling the movement of the lateral drive assembly (7) based on a pre-configured first speed level V1; In D1>D target -D now ≥D2, controlling the movement of the lateral drive assembly (7) based on a pre-configured second speed level V2, wherein V1>V2; At D target -D now When D2, control the movement of the lateral drive assembly (7) based on a pre-configured third speed level V3, where V2 > V3; In |D target -D now |≤D3, based on the current position D of the output shaft of the target device now and the target position D of the output shaft of the target device target Closed-loop control is performed on the transverse drive assembly (7) so that the output shaft of the target device is aligned with the transmission shaft (2).

3. A transmission test system for a helicopter according to claim 1, characterized in that: The plurality of target devices are main reducers or drive motors (5).

4. A transmission test system for a helicopter according to claim 3, characterized in that: A longitudinal guide rail (11) is provided on the transition plate (10), a main reducer base (9) is provided at the bottom of the main reducer, a drive motor base (5) is provided at the bottom of the drive motor (5), and the main reducer base (9) or the drive motor base (5) cooperates with the longitudinal guide rail (11); The transition plate (10) is also provided with a manual drive component (12), and the manual drive component (12) is used to drive the main reducer or the drive motor (5) to slide along the longitudinal guide rail (11), so that when the output shaft of the main reducer or the output shaft of the drive motor (5) is aligned with the transmission shaft (2), the output shaft of the main reducer is connected to the transmission shaft (2) or the output shaft of the drive motor (5) is connected to the transmission shaft (2) through the manual drive component (12).

5. The transmission test system for a helicopter according to claim 1, characterized in that: The transverse drive assembly (7) comprises a servo motor (701), a first worm gear reducer (702), a first lead screw (703) and a first nut (704); The first worm gear reducer (702) is fixed to one side of the main base (3) through a first reducer mounting seat, the servo motor (701) is fixed to the input end of the first worm gear reducer (702), the output shaft of the servo motor (701) is fixedly connected to the input shaft of the first worm gear reducer (702), one end of the first lead screw (703) is fixedly connected to the output shaft of the worm gear reducer, and the other end of the first lead screw (703) is rotatably connected to a distal support arranged on the other side of the main base (3); The first nut (704) cooperates with the first lead screw (703), a nut mounting plate is provided on the first nut (704), and the nut mounting plate is fixedly connected to the transition plate (10); The servo motor (701) is connected to the alignment control unit and is used for forward or reverse transmission based on the control instruction of the alignment control unit to input the rotation amount into the first worm gear reducer (702). The first worm gear reducer (702) is used to drive the first lead screw (703) after reducing the rotation amount, so as to linearly drive the first nut (704) and the target device on the transition plate.

6. A transmission test system for a helicopter according to claim 1, characterized in that: The hydraulic lock (8) comprises a hydraulic cylinder (801), a piston (802), a T-shaped screw (803), a disc spring (804) and a pre-tightening nut (805); The hydraulic cylinder body (801) is fixed on the transition plate (10); The piston (802) is arranged in the hydraulic cylinder body (801), the straight end of the T-shaped screw (803) is inserted into the piston (802) and is threadedly connected to the threaded hole in the center of the piston (802), and the pre-tightening nut (805) is fixed to the straight end of the T-shaped screw (803) to limit the piston (802) to the straight end of the T-shaped screw (803); The transverse guide rail (4) is provided with a T-shaped groove matching the T-shaped end of the T-shaped screw (803), and the T-shaped end of the T-shaped screw (803) passes through the hydraulic cylinder body (801) and cooperates with the T-shaped groove; the disc spring (804) is sleeved on the middle part of the T-shaped screw (803), the top end of the disc spring (804) contacts the bottom of the piston (802), and the bottom end of the disc spring (804) contacts the inner bottom surface of the hydraulic cylinder body (801); A hydraulic input hole is provided at the top of the hydraulic cylinder body (801), and the hydraulic input hole is externally connected to a high-pressure oil pump. The high-pressure oil pump is connected to the alignment control unit and is used to input high pressure based on the control command of the alignment control unit to compress the disc spring (804) to loosen the T-screw (803) and the T-slot, or release pressure based on the control command of the alignment control unit. The disc spring (804) lifts the T-screw (803) to lock the T-shaped end of the T-screw (803) with the T-slot.

7. A transmission test system for a helicopter according to claim 4, characterized in that: The manual drive assembly (12) comprises a hand wheel (1201), a second worm gear reducer (1202), a second lead screw (1203) and a second nut (1204); The second worm gear reducer (1202) is fixed on the transition plate (10) via a second reducer mounting seat; The hand wheel (1201) is connected to the input shaft of the second worm gear reducer (1202), one end of the second lead screw (1203) is connected to the output shaft of the second worm gear reducer (1202), the second nut (1204) cooperates with the second lead screw (1203), and the second nut (1204) is fixed to the main reducer base (9) or connected to the drive motor base (5); The second worm gear reducer (1202) is used to reduce the rotation amount input by the hand wheel (1201) and transmit it to the second lead screw (1203) to linearly drive the second nut (1204) and the main reduction base (9), or linearly drive the second nut (1204) and the drive motor base (5).

8. The transmission test system for a helicopter according to claim 1, characterized in that: The end of the transverse guide rail (4) is provided with a guide rail protection cover (401) for limiting the transition plate (10) and protecting the end of the transverse guide rail (4).

9. A transmission test system for a helicopter according to claim 1, characterized in that: The final reducer further includes an input shaft, and an external power source is input to the final reducer through the input shaft.

10. A transmission test system for a helicopter according to claim 1, characterized in that: A loading motor for simulating the tail rotor load of a helicopter is also provided at the end of the transmission shaft stand (1), and the loading motor is used to dock with the other end of the transmission shaft (2).

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