CN115924118A - A test bench for electric propulsion system of electric aircraft - Google Patents

Abstract

A test bench for an electric propulsion system of an electric airplane comprises a support assembly, a push-pull force measuring device, a coupling force transmission part, a torque measuring device and a propeller fixing device, wherein the support assembly comprises a section bar support and a second bottom plate; the push-pull force measuring device comprises a first bottom plate, a sliding block, a linear guide rail set and a push-pull force sensor II; the coupling force transmission part comprises a first bearing seat, a main shaft, a second bearing seat and a pneumatic floating joint, one end of the pneumatic floating joint is fixed at one end of the push-pull force sensor II, one end of the main shaft penetrates through the first bearing seat and a bearing in the second bearing seat and then is fixed on the pneumatic floating joint, and the other end of the main shaft is connected with the propeller fixing device; the torque measuring device comprises a torsion arm and a first push-pull force sensor which are connected through a floating joint, the torsion arm and the first push-pull force sensor are perpendicular to each other, and the torsion arm is detachably fixed on the main shaft. The invention can improve the accuracy and reliability of the data acquisition of the tension and the torque of the propeller for the electric airplane.

Description

A test bench for electric propulsion system of electric aircraft

technical field

The invention belongs to the technical field of testing electric propulsion systems for electric aircraft, and in particular relates to a test bench for electric propulsion systems for electric aircraft.

Background technique

As a hot spot in recent years, the electric aircraft industry has attracted attention from many fields, but its design ideas are very different from traditional aircraft. Electric aircraft pay more attention to the concepts of green environmental protection, high efficiency and energy saving of aircraft, and optimize the aircraft accordingly. Overall design: The motor is powered by the energy storage device, and the motor drives the propeller, ducted fan or other devices to generate flight power. As a propeller dynamic test bench that can measure various performance parameters of electric drive propellers, its research and development innovation has received extensive attention. The existing propeller power test bench can detect the push-pull force and torque of the propeller. However, most of its push-pull force measurement design structure is to directly connect the push-pull force sensor to the test floating platform. This design is difficult to eliminate the influence of the vibration of the floating platform caused by the rotation of the propeller on the test data. During the detection process, the propeller rotation is not stable. The situation will make it difficult for the floating platform support to support the main shaft, which will cause the main shaft to move in the support and cause the detection data to jump. Moreover, in the prior art, the torque sensor is directly hard-connected to the main shaft. This structure is likely to cause dynamic balance problems caused by vibration when the main shaft rotates at high speed. To sum up, it is necessary to improve and upgrade the structure of the existing propeller tension and torque test bench, in order to improve the accuracy and reliability of propeller test bench tension and torque data collection.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention proposes a test bench for the electric propulsion system of an electric aircraft, so as to improve the accuracy and reliability of the data acquisition of propeller tension and torque of the electric aircraft.

The purpose of the present invention and its technical problem are solved by adopting the following technical solutions. A test bench for an electric propulsion system for an electric aircraft proposed according to the present invention includes: a bracket assembly, a push-pull force measuring device, a coupling force transmission part, a torque measuring device, and a propeller fixing device. The bracket assembly includes a profile bracket and a The second bottom plate at the upper end of the profile support; the push-pull force measuring device includes the first bottom plate, a slider, a linear guide rail group and the second push-pull force sensor, and the second push-pull force sensor is horizontally fixed on one side of the second bottom plate through the support seat of the second push-pull force sensor. The guide rail group is arranged parallel to the push-pull force sensor 2 and fixed on the other side of the second bottom plate, the slider is fixed on the lower surface of the first bottom plate, and the slider is slidably assembled on the linear guide rail group; the coupling force transmission part includes the first bearing seat, the main shaft , The second bearing seat and the pneumatic floating joint, one end of the pneumatic floating joint is fixed on one end of the push-pull force sensor two, the first bearing seat and the second bearing seat are coaxially fixed on the first base plate, and the first bearing seat and the second bearing The seat is kept coaxial with the pneumatic floating joint, and one end of the main shaft passes through the bearing installed in the first bearing seat and the second bearing seat in turn and is fixed on the other end of the pneumatic floating joint, and the other end of the main shaft is connected with the propeller fixing device; the torque measuring device It includes a torque arm and a push-pull force sensor 1, the push-pull force sensor 1 is fixed on the first base plate through a torque sensor bracket, the torque arm and the push-pull force sensor 1 are connected through a floating joint, and the torque arm and the push-pull force sensor 1 are perpendicular to each other, and the torque arm can be The disassembly is fixed on the main shaft.

Further, the torque arm includes a sub-torque arm 1 and a sub-torque arm 2, and the sub-torque arm 1 and the sub-torque arm 2 are fastened to each other by bolts to clamp the main shaft, and the key between the sub-torque arm 2 and the main shaft is realized along the rotation direction of the main shaft. The radial stop connection.

Further, the propeller fixing device includes a mounting base and a flange, the mounting base is used to install the propeller and is coaxially connected with the flange through bolts, and the mounting base and the flange are coaxially fixed at the other end of the main shaft; the flange is connected to the flange through a flat key The main shaft is connected to avoid the relative radial rotation of the two, and the first lock nut is fixed on the main shaft, and the first lock nut compresses and fixes the flange axially on the corresponding shaft shoulder of the main shaft.

Further, the bearing installed in the first bearing seat is a double-row 7005 angular contact ball bearing, and the second lock nut is firmly connected to the main shaft to fix the bearing in the first bearing seat on the main shaft.

Further, the product of the push-pull force collected by the push-pull force sensor 1 and the effective moment arm of the torque measuring device is the torque during the test of the electric propulsion system.

Further, the push-pull force measuring device also includes a safety guide assembly, and the safety guide assembly includes a safety rod bracket 1, a floating safety rod and a safety rod bracket 2, the safety rod bracket 2 is fixed on the first base plate, and the safety rod bracket 1 is fixed on the second On the base plate, the holes on the safety rod bracket 1 and the holes on the safety rod bracket 2 are concentric; The bar is horizontally connected between the first bottom plate and the second bottom plate, and the floating safety bar is kept parallel to the linear guide rail group.

Further, nuts are provided at both ends of the floating safety rod group, and the nuts are not in direct contact with the corresponding safety rod brackets.

Further, the safety guide components are arranged symmetrically on both sides of the push-pull force sensor two.

Further, the push-pull force measuring device further includes a triangular support frame, and the triangular support frame is simultaneously fixed on the second support seat of the push-pull force sensor and the second bottom plate to support the second support seat of the push-pull force sensor.

Further, the bracket assembly also includes universal casters with adjustment blocks installed at the lower end of the profile bracket.

With the help of the above-mentioned technical solution, the propeller tension and torque measurement platform proposed by the present invention adopts a structural design in which the push-pull force sensor 2 is directly connected to the main shaft through the pneumatic floating joint for the measurement of the tension, so as to eliminate the problem caused by the uneven rotation of the propeller. The impact of floating platform vibration on the final test data. For the measurement of torque, the push-pull force sensor is used instead of the torque sensor to avoid dynamic balance problems, and a self-centering floating joint is assembled on the push-pull force sensor to ensure that the push-pull force sensor is in the positive and negative torque measurement. Concentricity ensures that the push-pull force sensor can accurately measure the forward and reverse torque of the propeller, prolong the service life of the present invention, and make the installation of the overall structure of the present invention more convenient, which solves the problem of not being able to detect the propeller more accurately in the prior art Technical issues with performance parameters.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a test bench for an electric propulsion system for an electric aircraft of the present invention.

Fig. 2 is a schematic front view of a test bench for an electric propulsion system for an electric aircraft of the present invention.

Fig. 3 is a schematic top view of the test bench for the electric propulsion system of the electric aircraft of the present invention.

FIG. 4 is a schematic diagram of the cross-sectional structure along A-A in FIG. 3 .

Marking description of main components:

1-Installation base, 2-Flange, 3-First bearing seat, 4-Spindle, 5-Torque arm, 6-Floating joint, 7-Push-pull force sensor 1, 8-Torque sensor bracket, 9-Second bearing seat , 10-pneumatic floating joint, 11-push-pull force sensor two, 12-push-pull force sensor two bracket, 13-triangular support frame, 14-safety rod bracket one, 15-floating safety rod, 16-safety rod bracket two, 17- The first bottom plate, 18-the second bottom plate, 19-slider, 20-linear guide rail group, 21-profile bracket, 22-universal casters with adjustment block.

Detailed ways

The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments. It should be understood that words such as "first", "second" and similar words used in the description and claims of the present invention do not indicate any order, quantity or importance, but are only names used to distinguish features. The terms "upper", "lower", "front", "rear" and the like appearing in the present invention related to orientation or position are only for convenience of explanation, and are not limited to a certain specific direction or specific position.

As shown in Figs. 1 to 4, a test bench for an electric propulsion system for an electric aircraft is specifically a propeller dynamic performance test device for an electric aircraft, which is used to measure the tension and torque of the propeller. The electric propulsion system test bench for electric aircraft includes a bracket assembly, a push-pull force measuring device, a coupling force transmission part, a torque measuring device and a propeller fixing device.

Described support assembly comprises profile support 21, second bottom plate 18 and belt adjustment block universal caster 22, profile support 21 is placed vertically, and 4 band adjustment block universal casters are respectively fixed on profile support 21 bottom four pin places, with Realize the movement and positioning of the entire measuring bench; the second bottom plate 18 is horizontally fixed on the upper end of the profile support 21 for installing and supporting other components.

Described push-pull force measuring device comprises the first base plate 17, slide block 19, linear guide rail group 20, push-pull force sensor two 11 and push-pull force sensor two support bases 12, described push-pull force sensor two support bases 12 are vertically fixed on the second On one side of the base plate 18, the push-pull sensor two 11 are vertically fixed on the push-pull sensor two support seats 12, that is, the stressed direction of the push-pull force sensor two 11 is perpendicular to the push-pull force sensor two support seats 12 height directions; as preferably, the second The base plate 18 is also provided with a triangular support frame 13, and the triangular support frame 13 is fixed on the second support base of the push-pull force sensor and the second base plate at the same time to support the second support base of the push-pull force sensor and improve the stability of the second push-pull force sensor. The linear guide rail group 20 is parallel to the push-pull force sensor 2 11 and is fixed on the other two sides of the second base plate 18, and the slide block 19 is fixed on the lower surface of the first base plate 17, and the first base plate 17 is placed on the linear guide rail group 20 by the slide block 19. and can move forward and backward along the extending direction of the linear guide rail set 20. Further, the push-pull force measuring device also includes a safety guide assembly, the safety guide assembly includes a safety rod bracket 14, a floating safety rod 15 and a safety rod bracket 2 16, the safety rod bracket 2 16 is fixed on the first base plate 17, and the safety rod bracket One 14 is fixed on the second bottom plate 18, the hole position on the safety rod bracket one 14 is coaxial with the hole position on the safety rod bracket two 16, and the floating safety rod 15 passes through the safety rod bracket group one 14 and the safety rod bracket group Corresponding holes on two 16, so that the floating safety bar 15 is horizontally connected between the first base plate 17 and the second base plate 18, and the floating safety bar is kept parallel with the linear guide rail group 20, and the floating safety bar group 15 two ends are all provided with There are nuts 151, and the nuts at both ends are not in direct contact with the safety rod brackets at the corresponding ends, so as to ensure the normal operation of the push-pull force measuring device. In this embodiment, the safety guide components are symmetrically distributed on both sides of the push-pull force sensor 11, so as to improve the safety and stability of the push-pull force measuring device during operation.

The coupling force transmission part includes a first bearing seat 3, a main shaft 4, a second bearing seat 9 and a pneumatic floating joint 10. In the description of this embodiment, the axial direction of the main shaft is the front-back direction, and the end where the propeller is located is the front end. The pneumatic floating joint 10 is fixed at one end of the push-pull force sensor 2 11, and the other end of the push-pull force sensor 2 11 is fixed at the support base of the push-pull force sensor 2. The first bearing seat 3 and the second bearing seat 9 are coaxially fixed on the first bottom plate 17, and the first bearing seat 3/second bearing seat 9 are kept coaxial with the pneumatic floating joint 10, and one end of the main shaft 4 passes through them in turn The bearings installed in the first bearing seat and the second bearing seat are fixed on the pneumatic floating joint 10 afterward. Pneumatic floating joint 10 is the prior art, and this pneumatic floating joint is made up of two parts, and one part is connected with main shaft 4, and another part is connected with push-pull sensor 211, and two parts are connected by ball joint, can transmit push-pull force but can not transmit torsion force, can simultaneously The problem of eccentricity and parallelism between the main shaft 4 and the push-pull force sensor 11 is absorbed. Therefore, using the pneumatic floating joint as a connecting piece can not only improve the measurement accuracy of the push-pull force sensor 2, but also simplify the bench installation process, improve the running stability of the equipment, and prolong the service life of the push-pull force sensor 2.

The torque measuring device comprises a torque arm 5, a floating joint 6, a push-pull sensor-7 and a torque sensor support 8, the torque arm 5 is connected to the main shaft 4 by bolts and keys, and the push-pull sensor-7 passes through The torque sensor bracket 8 is fixed on the first base plate 17, the torque arm 5 and the push-pull force sensor one 7 are connected through the floating joint 6, and the torque arm 5 and the push-pull force sensor one 7 remain perpendicular to each other, that is, the push-pull force sensor one The force direction should be kept perpendicular to the height direction, and the height direction is perpendicular to the extension direction of the main shaft. Specifically, as shown in Figure 4, the torsion arm 5 includes a sub torsion arm one 51 and a sub torsion arm two 52, the sub torsion arm one 51 and the sub torsion arm two 52 are interlocked by bolts to clamp the main shaft, and the sub torsion arm two The key 53 is used to realize the radial anti-rotation connection along the main shaft rotation direction. When the main shaft rotates, the power is transmitted through the key 53 to drive the torque arm to rotate. When the torque arm rotates, the floating joint 6 is stressed, and the floating joint can further The force transmitted by the torque arm is transmitted to the first push-pull force sensor; the floating joint used in this embodiment is the prior art. In the torque measuring device, the torque arm and the push-pull force sensor one are connected through a floating joint and kept perpendicular to each other. Torsion is generated when the propeller rotates, and the torque is transmitted to the push-pull force sensor one through the main shaft and the torque arm, and the push-pull force sensor one collects The product of the effective moment arm of the force and torque measurement part is the torque during the test of the electric propulsion system. Assuming that the effective moment arm of the torque measurement part is L, as shown in Figure 4, L is the vertical distance from the rotation center of the main shaft to the center of the floating joint, the vertical direction is perpendicular to the axial direction of the main shaft, and the center of the floating joint The axis is coaxial with the central axis of the push-pull force sensor one.

The propeller fixing device includes a mounting base 1 and a flange 2, the mounting base 1 and the flange 2 are coaxially connected by bolts, and the mounting base 1 and the flange 2 are coaxially fixed on the other end of the main shaft 4. In this embodiment, the flange 2 is connected to the main shaft 4 through a flat key to avoid the relative radial rotation of the two, and is locked with the first lock nut 201. The first lock nut is a threaded hole on the nut and is locked with a stop screw After the stop screw is locked and pressed against the main shaft, the first lock nut is fixed on the main shaft, and the first lock nut axially compresses and fixes the flange 2 on the corresponding shaft shoulder of the main shaft.

In this embodiment, the bearing installed in the first bearing seat is a double-row 7005 angular contact ball bearing, and the outer ring of the bearing has an interference fit with the corresponding bearing seat, so that the bearing is fixed in the first bearing seat, and the inner ring of the bearing is sleeved on the main shaft. 4, one side is constrained by the diameter difference of the main shaft 4, and the other side is fixed on the main shaft 4 by the second lock nut 301, and the second lock nut is a threaded hole on the nut and is used to prevent loosening with a stop screw; and the above method The flange fixing form is similar, and the second lock nut axially compresses and fixes the bearing in the first bearing seat on another shoulder of the main shaft, so the main shaft has a stepped shaft structure. 7005 angular contact ball bearings are centripetal thrust bearings, which can transmit radial and axial loads, but cannot transmit torque. Therefore, the use of angular contact ball bearings can reduce the vibration caused by the rotation of the main shaft while transmitting push and pull forces. The use of eccentric and angular contact ball bearings can not only make the structure more stable, but also meet the accuracy requirements of push-pull force and torsion force measurement. In this embodiment, the bearing in the second bearing seat may also be a 7005 angular contact ball bearing, which will not be repeated here.

Working principle of the present invention is specifically as follows:

In the whole test bench, the installation base 1 is fixed on the flange 2 by bolts, and the propeller is installed on the installation base 1. The propeller is driven by a motor to achieve high-speed rotation. One end of the main shaft 4 passes through the through hole on the flange 2 and uses a flat key and a second A lock nut realizes the coaxial fixation with the flange, which is used to transmit the push-pull force and torque generated by the propeller to the main shaft 4; the other end of the main shaft 4 is connected to one end of the pneumatic floating joint 10 through a threaded hole, and the push-pull force sensor 11 is connected to the pneumatic floating joint 10. The other end of the joint 10 is connected and fixed on the second base plate 18 by two brackets of the push-pull force sensor, and the second base plate 18 of the push-pull force sensor 11 is arranged parallel to the second base plate 18; The bearing is fixed on the first bottom plate 17 and fixed by the second lock nut. The bottom of the first bottom plate 17 is fixed with a slider 19, which can move freely back and forth through the linear guide rail group 20 fixed on the second bottom plate 18 and with the first bottom plate 18. The two bottom plates 18 are kept parallel. The first safety rod bracket 14 is fixed on the second base plate 18 by bolts, the second safety rod bracket 16 is fixed on the first base plate 17 by bolts, and the floating safety rod 15 passes through the two holes of the first safety rod bracket group and the second safety rod bracket group position and keep parallel with the linear guide rail group, the floating safety rod connects the first base plate 17 and the second base plate 18, nuts are provided at both ends of the floating safety rod group 15 and the nuts are not in direct contact with any safety rod bracket, in order to ensure the push-pull force measurement While the device is not affected, avoid safety accidents due to damage to the pneumatic floating joint 10, the second push-pull force sensor 11 and the second push-pull sensor bracket 12. The push-pull force measuring device is used for the push-pull force measurement of the propeller system. One end of the push-pull force sensor-7 is fixed on the first base plate 17 through the torque sensor bracket 8, the push-pull force sensor-1 is arranged parallel to the first base plate, the other end of the push-pull force sensor-7 is connected with the torque arm 5 through the floating joint 6, and the floating joint 6 It can absorb the eccentricity in the vertical direction (the vertical direction is perpendicular to the axial direction of the main shaft), so that the torsion force on the push-pull force sensor-7 is always in a parallel state, that is, the force direction of the push-pull force sensor-7 is always in line with the axial direction of the main shaft Keep the direction vertical, and support torque measurement in forward and reverse directions at the same time. The torque arm 5 is clamped in the middle of the main shaft 4 by bolts. At the same time, the torque arm 5 and the main shaft 4 are connected through the key 53 to transmit torque. The force sensor one 7 and the torque sensor bracket 8 constitute a torque measuring device for torque measurement of the propeller system.

During the test, the push-pull force when the propeller is working is detected by the push-pull force sensor 211. When the propeller rotates, the push-pull force in the horizontal direction will be generated, and then the main shaft 4 will be driven and driven by the first bearing seat 3 and the second bearing seat 9. The first bottom plate 17 slides on the linear guide rail group 20, the main shaft 4 transmits the push-pull force generated by the rotation of the propeller to the push-pull force sensor 2 11 through the pneumatic floating joint 10, and the push-pull force sensor 2 11 passes the detected push-pull force through data collection. The card is transmitted to the computer display terminal, and when the propeller stops rotating, the main shaft 4 stops transmitting push-pull force to the push-pull force sensor 2 11, and the push-pull force sensor 2 11 stops detecting data. When testing the push-pull force when the propeller is working, the torque arm is not installed on the main shaft.

During the test, the positive and negative torques of the propeller are detected by the push-pull force sensor one. When the propeller rotates, torque is generated to drive the main shaft 4 to rotate. The main shaft 4 drives the torque arm 5 to contact the floating joint 6 at the front end of the push-pull force sensor one 7. When the propeller rotates, torque can be generated, and the torque is transmitted to the push-pull force sensor-7 through the main shaft 4 and the torque arm 5. The product of the push-pull force collected by the push-pull force sensor-7 and the effective force arm of the torque measurement part is the electric propulsion system test. time torque.

The above is only a preferred embodiment of the present invention, and the parts that are not described in detail are all prior art; In essence, any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (10)

1. An electric propulsion system test stand for electric aircraft is characterized in that it comprises: a support assembly, a push-pull force measuring device, a coupling force transmission part, a torque measuring device and a propeller fixing device, and the support assembly includes a profile support and is located on The second bottom plate at the upper end of the profile support; the push-pull force measuring device includes the first bottom plate, a slider, a linear guide rail group and the second push-pull force sensor, and the second push-pull force sensor is horizontally fixed on one side of the second bottom plate through the support seat of the second push-pull force sensor. The guide rail group is arranged parallel to the push-pull force sensor 2 and fixed on the other side of the second bottom plate, the slider is fixed on the lower surface of the first bottom plate, and the slider is slidably assembled on the linear guide rail group; the coupling force transmission part includes the first bearing seat, the main shaft , The second bearing seat and the pneumatic floating joint, one end of the pneumatic floating joint is fixed on one end of the push-pull force sensor two, the first bearing seat and the second bearing seat are coaxially fixed on the first base plate, and the first bearing seat and the second bearing The seat is kept coaxial with the pneumatic floating joint, and one end of the main shaft passes through the bearing installed in the first bearing seat and the second bearing seat in turn and is fixed on the other end of the pneumatic floating joint, and the other end of the main shaft is connected with the propeller fixing device; the torque measuring device It includes a torque arm and a push-pull force sensor 1, the push-pull force sensor 1 is fixed on the first base plate through a torque sensor bracket, the torque arm and the push-pull force sensor 1 are connected through a floating joint, and the torque arm and the push-pull force sensor 1 are perpendicular to each other, and the torque arm can be The disassembly is fixed on the main shaft. 2. The electric propulsion system test bench for an electric aircraft according to claim 1, wherein the torque arm comprises a sub-torque arm 1 and a sub-torque arm 2, and the sub-torque arm 1 and the sub-torque arm 2 are fastened together by bolts The main shaft is clamped, and the radial anti-rotation connection along the rotation direction of the main shaft is realized through the key between the sub-torque arm two and the main shaft. 3. The electric propulsion system test bench for an electric aircraft according to claim 1, wherein the propeller fixing device includes a mounting base and a flange, and the mounting base is used for mounting the propeller and is connected with the flange through bolts. Shaft connection, the installation base and the flange are coaxially fixed on the other end of the main shaft; the flange is connected to the main shaft through a flat key to avoid relative radial rotation of the two, and the first lock nut is fixed on the main shaft and the first lock nut locks the flange The axial compression is fixed on the corresponding shoulder of the main shaft. 4. A test bench for electric propulsion system for electric aircraft according to claim 1, characterized in that: the bearing installed in the first bearing housing is a double-row 7005 angular contact ball bearing, and the second lock nut is fixedly connected to the main shaft Then fix the bearing in the first bearing seat on the main shaft. 5. The electric propulsion system test bench for an electric aircraft according to claim 1, wherein the product of the push-pull force collected by the push-pull force sensor and the effective arm of the torque measuring section is torque. 6. A test bench for electric propulsion system for electric aircraft according to claim 1, characterized in that: the push-pull force measuring device also includes a safety guide assembly, and the safety guide assembly includes a safety rod bracket one, a floating safety rod and a safety rod Bracket 2, safety rod bracket 2 is fixed on the first base plate, safety rod bracket 1 is fixed on the second base plate, the hole position on the safety rod bracket 1 is coaxial with the hole position on the safety rod bracket 2; the floating safety rod wears Through the corresponding holes on the safety rod bracket group 1 and the safety rod bracket group 2, the floating safety rod is horizontally connected between the first base plate and the second base plate, and the floating safety rod is kept parallel to the linear guide rail group. 7 . The electric propulsion system test bench for electric aircraft according to claim 6 , wherein nuts are provided at both ends of the floating safety rod group, and the nuts are not in direct contact with the corresponding safety rod brackets. 8 . 8 . The electric propulsion system test bench for electric aircraft according to claim 6 or 7 , wherein the safety guide components are arranged symmetrically on both sides of the push-pull force sensor 2 . 9. The electric propulsion system test bench for a kind of electric aircraft according to claim 1, characterized in that: the push-pull force measuring device also includes a triangular support frame, and the triangular support frame is fixed on the push-pull force sensor two supporting seats and the second on the bottom plate to support the second support seat of the push-pull force sensor. 10. A test bench for electric propulsion system for electric aircraft according to claim 1, characterized in that: the bracket assembly also includes swivel casters with adjustment blocks installed at the lower end of the profile bracket.

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