A load release device and a turboshaft engine ground test bench having the same

Abstract

The present invention provides a load release device and a turboshaft engine ground test bench having the same, belonging to the technical field of turboshaft engines, comprising: a housing and a driving device, wherein a driving shaft and a driven shaft are rotatably arranged in the housing, the driving shaft is suitable for being connected to an external driving device, and the driven shaft is suitable for being connected to an external driven device; an active connecting piece is connected to the driving shaft, and a driven connecting piece is connected to the driven shaft, and the active connecting piece and the driven connecting piece are connected or disconnected by relative movement along the axial direction; the active shaft of the present invention can be used to connect to the turboshaft engine, and the driven shaft can be used to connect to a power absorption measuring device, and the driving armature is driven to move, so that the active connecting piece on the driving shaft and the driven connecting piece on the driven shaft can be connected or disconnected, thereby realizing the connection or disconnection between the turboshaft engine and the power absorption measuring device, without destroying any structure, and the device can be reused, thereby reducing the test cost.

Description

Technical Field

[0001] The present invention relates to the technical field of turboshaft engines, and in particular to a load release device and a turboshaft engine ground test bench having the same. Background Art

[0002] Turboshaft engines need to undergo ground containment tests to assess the containment capacity of the casing after the power turbine blades fall off and the engine's ability to withstand unbalanced loads. During ground tests, the power output shaft is connected to a power absorption measuring device, which converts the output mechanical work of the turboshaft engine into other forms of energy that are utilized through a medium or dissipated into the atmosphere.

[0003] Blade shedding generally requires the power turbine speed to be increased to more than 150% of the design speed. The centrifugal force generated by the overspeed rotation of the impeller causes the blades to fall off autonomously, thereby conducting relevant verification tests. In order to achieve the purpose of power turbine blade shedding, the turboshaft engine needs to be disconnected from the power absorption measuring device when it reaches the target state. The instantaneous load separation can increase the power turbine to the speed at which the blades fall off, while not causing the power absorption measuring device to operate in an overspeed state.

[0004] Generally, when the turboshaft engine runs to the target state, the connecting shaft connected to the power absorption measuring device is cut off to achieve the purpose of load separation of the turboshaft engine. However, each test requires the destruction of a connecting shaft, and the test cost is high. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of high testing cost in the prior art of cutting off the connecting shaft connected to the power absorption measuring device to achieve the purpose of load separation of the turboshaft engine, thereby providing a load separation device and a turboshaft engine ground test bench having the same.

[0006] In order to solve the above technical problems, the present invention provides a load release device, comprising: a housing, a driving shaft and a driven shaft are rotatably arranged in the housing, the driving shaft is suitable for connecting to an external driving device, and the driven shaft is suitable for connecting to an external driven device; an active connecting piece is connected to the driving shaft, and a driven connecting piece is connected to the driven shaft, and the active connecting piece and the driven connecting piece are connected or disconnected by relative movement along the axial direction;

[0007] The electromagnetic drive device has an armature that can be moved by electromagnetic drive, and the armature is slidably installed on the driving shaft or the driven shaft. The armature drives the driving connecting plate and / or the driven connecting plate to move relative to each other in the axial direction to achieve connection or disconnection between the driving connecting plate and the driven connecting plate.

[0008] Optionally, it also includes: an elastic member, which is connected to the active connecting plate and / or the driven connecting plate, and has an elastic force that drives the active connecting plate and / or the driven connecting plate to move relative to each other in the axial direction so as to release the connection between the active connecting plate and the driven connecting plate.

[0009] Optionally, the active connecting plate and the driven connecting plate include a plurality of plates that are sequentially spaced apart, a first elastic member is disposed between the plurality of active connecting plates, and a second elastic member is disposed between the plurality of driven connecting plates.

[0010] Optionally, the active connecting piece and the driven connecting piece are connected by circumferential clamping after being embedded in each other.

[0011] Optionally, the center of the driven connecting plate has a through hole for embedding the active connecting plate, the circumference of the active connecting plate is provided with a plurality of first clamping blocks protruding outward, and the circumference of the through hole of the driven connecting plate has a plurality of first clamping grooves cooperating with the first clamping blocks.

[0012] Optionally, the end of the first block has a bite reinforcement portion extending in the circumferential direction.

[0013] Optionally, the active connecting piece is slidably connected to the active shaft through key fitting.

[0014] Optionally, one end of the active shaft has a spline segment for cooperating with the active connecting piece, and the spline segment has a plurality of key structures evenly spaced in the circumference.

[0015] Optionally, the driven connecting piece is slidably connected to the driven shaft through a key fit.

[0016] Optionally, one end of the driven shaft is connected to a sleeve member, and the inner wall of the sleeve member is provided with a plurality of key structures evenly spaced along the circumferential direction for cooperating with the driven connecting piece.

[0017] Optionally, the sleeve member has two detachable parts, one part is connected to the driven shaft, and the other part is connected to the driven connecting plate.

[0018] A turboshaft engine ground test bench, comprising: a turboshaft engine, a power absorption measurement device and a load release device according to any one of the above schemes;

[0019] The load release device is arranged between the turboshaft engine and the power absorption measuring device, the driving shaft of the load release device is connected to the turboshaft engine, and the driven shaft of the load release device is connected to the power absorption measuring device.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The load release device provided by the present invention has a driving shaft that can be used to connect to a turboshaft engine, and a driven shaft that can be used to connect to a power absorption measuring device. By driving the armature to move, the driving connecting piece on the driving shaft and the driven connecting piece on the driven shaft can be connected or disconnected, thereby realizing the connection or disconnection between the turboshaft engine and the power absorption measuring device. There is no need to destroy any structure, the device can be reused, and the test cost is reduced.

[0022] 2. The load release device provided by the present invention utilizes the elastic force of the elastic member to change the active connecting plate and the driven connecting plate from a connected state to a disconnected state. The armature of the electromagnetic drive device only needs to move in one direction to make the active connecting plate and the driven connecting plate become connected, and the driving of the armature is more convenient.

[0023] 3. The load release device provided by the present invention has a larger contact area and a more stable connection when multiple active connecting plates and driven connecting plates are connected. It can transmit a larger torque, improve the stability of the equipment during the test, and avoid damage to the equipment caused by vibration.

[0024] 4. The turboshaft engine ground test bench provided by the present invention is connected to the power absorption measuring device by a load release device, so that the turboshaft engine and the power absorption measuring device can be connected or disconnected, and no structure needs to be destroyed when disconnecting. It can be reused, which increases the service life and reduces the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A front view of a turboshaft engine ground test bench provided in a first embodiment of the present invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the interior of the middle shell;

[0028] Figure 3 for Figure 2 A side view of the driven connecting piece;

[0029] Figure 4 for Figure 2 A side view of the middle active connecting piece;

[0030] Figure 5 for Figure 2 Magnified view of area A.

[0031] Description of reference numerals:

[0032] 1. Housing; 2. Active shaft; 3. Driven shaft; 4. Active connecting plate; 5. Driven connecting plate; 6. Brush ring; 7. Armature; 8. First elastic member; 9. Second elastic member; 10. Through hole; 11. First clamping block; 12. First clamping groove; 13. Engagement reinforcement part; 14. Spline section; 15. Sleeve member; 16. Turboshaft engine; 17. Power absorption measuring device; 18. Iron core; 19. Coil. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] like Figures 2 to 5As shown, a specific implementation of the load release device provided in this embodiment includes: a housing 1 and a driving device, a driving shaft 2 and a driven shaft 3 are rotatably arranged in the housing 1, the driving shaft 2 is suitable for connecting to an external driving device, and the driven shaft 3 is suitable for connecting to an external driven device; an active connecting piece 4 is connected to the active shaft 2, and a driven connecting piece 5 is connected to the driven shaft 3, and the active connecting piece 4 and the driven connecting piece 5 are connected or disconnected by relative movement along the axial direction;

[0038] The electromagnetic drive device has an armature 7 that can be moved by electromagnetic drive. The armature 7 is slidably mounted on the active shaft 2 or the driven shaft 3. The armature 7 drives the main connecting plate and / or the driven connecting plate 5 to move relative to each other in the circumferential direction to achieve connection or disconnection between the active connecting plate 4 and the driven connecting plate 5. In this embodiment, the armature 7 is slidably mounted on the spline segment 14 on the active shaft 2. The electromagnetic drive device may also include a coil 19 and an iron core 18 mounted on the active shaft 2. The housing 1 is connected to a brush ring 6 that contacts the iron core 18. The brush ring 6 supplies current to the coil 19, thereby causing the iron core 18 and the armature 7 to attract each other to drive the armature 7 to move. In addition, as an alternative embodiment, the armature 7 may also be slidably mounted on the driven shaft 3, and the corresponding coil 19 and iron core 18 are also mounted on the driven shaft 3.

[0039] The load release device provided in this embodiment can be used to connect the driving shaft 2 to the turboshaft engine 16, and the driven shaft 3 to the power absorption measuring device 17. By driving the armature 7 to move, the driving connecting piece 4 on the driving shaft 2 and the driven connecting piece 5 on the driven shaft 3 can be connected or disconnected, thereby realizing the connection or disconnection between the turboshaft engine 16 and the power absorption measuring device 17 without destroying any structure, and the device can be reused, thereby reducing the test cost.

[0040] like Figure 2 , Figure 5 As shown, the load release device provided in this embodiment also includes: an elastic member, the elastic member is connected to the active connecting piece 4 and / or the driven connecting piece 5, and the elastic member has an elastic force that drives the active connecting piece 4 and / or the driven connecting piece 5 to move relative to each other in the circumferential direction so as to release the connection between the active connecting piece 4 and the driven connecting piece 5. The elastic force of the elastic member is used to change the active connecting piece 4 and the driven connecting piece 5 from the connected state to the disconnected state. The armature 7 of the electromagnetic drive device only needs to move in one direction to change the active connecting piece 4 and the driven connecting piece 5 into the connected state, and the drive of the armature 7 is more convenient. In addition, as an alternative embodiment, the elastic member can also be omitted, and the direction of the input current is changed, thereby changing the direction of the magnetic field to drive the armature 7 to move in both directions, thereby realizing the disconnection state between the active connecting piece 4 and the driven connecting piece 5.

[0041] like Figure 2, Figure 5 As shown, in the load release device provided by the present embodiment, the active connecting piece 4 and the driven connecting piece 5 have multiple pieces arranged in sequence at intervals, the piece of the multiple active connecting pieces 4 closest to the iron core 18 is fixed on the active shaft 2, and the piece of the multiple driven connecting pieces 5 closest to the iron core 18 is fixed on the driven shaft 3, and the remaining active connecting pieces 4 and the driven connecting pieces 5 can slide axially, and a first elastic member 8 is provided between the multiple active connecting pieces 4, and the first elastic member 8 can be a ring spring, and a second elastic member 9 is provided between the multiple driven connecting pieces 5, and the second elastic member 9 can also be a ring spring. By squeezing the first elastic member 8 and the second elastic member 9 by the armature 7, the multiple active connecting pieces 4 and the multiple driven connecting pieces 5 can be moved in one direction, so that the multiple active connecting pieces 4 and the multiple driven connecting pieces 5 are connected. When the multiple active connecting pieces 4 and the driven connecting pieces 5 are connected, the contact area is larger, the connection is more stable, and the torque that can be transmitted is larger, which can improve the stability of the equipment during the test and avoid vibration causing damage to the equipment. In addition, as an alternative embodiment, the multiple active connecting pieces 4 can also be set to be fixed, then the first elastic member 8 is omitted, the multiple driven connecting pieces 5 still maintain the above-mentioned setting, and the armature 7 drives the multiple driven connecting pieces 5 to move, and then connect with the active connecting piece 4;

[0042] Alternatively, the plurality of driven connecting plates 5 are arranged to be fixed, and then the second elastic member 9 is omitted, and the plurality of active connecting plates 4 still maintain the above arrangement, and the armature 7 drives the plurality of active connecting plates 4 to move and then connect with the driven connecting plates 5 .

[0043] like Figures 2 to 4 In the load release device provided in this embodiment, the active connecting piece 4 and the driven connecting piece 5 are connected by circumferential clamping after being embedded in each other. Since the connection method is embedded clamping, the active connecting piece 4 and the driven connecting piece 5 are connected by relying on the four sides of their bodies, the contact area is larger, the connection is more stable, and a larger torque can be transmitted, and it is not easy to damage the bodies of the active connecting piece 4 and the driven connecting piece 5. In addition, as an alternative embodiment, the active connecting piece 4 and the driven connecting piece 5 can also be connected by plugging and friction contact. For example, a column protruding outward along the axial direction is provided on the active connecting piece 4, and a column groove matching the body is provided on the driven connecting piece 5, or friction plates are respectively provided on the sides of the active connecting piece 4 and the driven connecting piece 5 that are close to each other, and the friction force is increased by the friction plate, and then transmitted.

[0044] like Figures 2 to 4In the load release device provided in this embodiment, the center of the driven connecting piece 5 has a through hole 10 for embedding the active connecting piece 4, the circumference of the active connecting piece 4 is provided with a plurality of first clamping blocks 11 protruding outwards, the circumference of the through hole 10 of the driven connecting piece 5 has a plurality of first clamping grooves 12 cooperating with the first clamping blocks 11, the entire active connecting piece 4 is embedded in the driven connecting piece 5, the diameter of the driven connecting piece 5 is much larger than the diameter of the active connecting piece 4, and the embedded circumferential clamping connection of the active connecting piece 4 and the driven connecting piece 5 is achieved through the cooperation of the first clamping block 11 and the first clamping groove 12. In addition, as an alternative embodiment, the diameter of the active connecting piece 4 can also be made much larger than that of the driven connecting piece 5, then a through hole 10 is provided in the center of the active connecting piece 4, the circumference of the driven connecting piece 5 is provided with a plurality of first clamping grooves 12 cooperating with the first clamping block 11, and the circumference of the through hole 10 of the active connecting piece 4 has a plurality of first clamping grooves 12 cooperating with the first clamping block 11.

[0045] like Figure 4 As shown, in the load release device provided in this embodiment, the end of the first clamping block 11 has a bite reinforcement portion 13 extending in the circumferential direction, and the bite reinforcement portion 13 can increase the contact area between the first clamping block 11 and the first clamping groove 12 to improve the stability between the active connecting piece 4 and the driven connecting piece 5. In addition, as an alternative embodiment, the bite reinforcement portion 13 can also extend in the radial direction, for example, its shape can be L-shaped.

[0046] like Figure 2 , Figure 4 As shown, in the load release device provided in this embodiment, the active connecting piece 4 is slidably connected to the active shaft 2 through key matching. This connection method can be achieved by simply adjusting the shapes of the active connecting piece 4 and the active shaft 2, without the need for other components. The connection method is simple and practical. In addition, as an alternative embodiment, the active connecting piece 4 can also be slidably connected to the active shaft 2 by plugging. For example, a plurality of cylinders evenly distributed along the circumferential direction are arranged on the active shaft 2, and the plurality of cylinders are inserted into the active connecting piece 4. The active connecting piece 4 moves axially along the cylinders, and the plurality of cylinders can drive the active connecting piece 4 to rotate.

[0047] like Figure 2 , Figure 4 As shown, in the load release device provided in this embodiment, one end of the driving shaft 2 has a spline segment 14 for cooperating with the active connecting piece 4, and the spline segment 14 has a plurality of key structures evenly arranged in the circumferential direction. The key structure of the spline segment 14 cooperates with the active connecting piece 4 to achieve power transmission. In addition, as an alternative implementation, a key structure can also be arranged on the inner side of the active connecting piece 4, and one end of the driving shaft 2 is provided with a groove structure distributed along the circumferential direction.

[0048] like Figure 2 , Figure 3 As shown, in the load release device provided in this embodiment, the driven connecting piece 5 is slidably connected to the driven shaft 3 by key fitting. This connection method can be achieved by simply adjusting the shapes of the driven connecting piece 5 and the driven shaft 3, without the need for other components. The connection method is simple and practical. In addition, as an alternative embodiment, the driven connecting piece 5 can also be slidably connected to the driven shaft 3 by plugging. For example, a plurality of cylinders evenly distributed along the circumferential direction are arranged on the driven shaft 3, and the plurality of cylinders are inserted into the driven connecting piece 5. The driven connecting piece 5 moves axially along the cylinders, and the plurality of cylinders can drive the driven connecting piece 5 to rotate.

[0049] like Figure 2 , Figure 3 As shown, in the load release device provided in this embodiment, one end of the driven shaft 3 is connected to a sleeve member 15, and the inner wall of the sleeve member 15 is provided with a plurality of key structures evenly spaced along the circumferential direction for cooperating with the driven connecting piece 5. The sleeve member 15 plays the role of an intermediate connection, and only wears the sleeve member 15 during use, which can increase the service life of the driven shaft 3 and further reduce the test cost. In addition, as an alternative implementation, a key structure can also be provided on the outer side of the driven shaft 3, and a groove structure can be provided on the inner wall of the sleeve member 15.

[0050] like Figure 2 , Figure 3 As shown, in the load release device provided in this embodiment, the sleeve member 15 has two detachable parts, one part is connected to the driven shaft 3, and the other part is connected to the driven connecting piece 5. The sleeve member 15 is further divided. When it is damaged, only the part connected to the driven connecting piece 5 needs to be replaced, which reduces the maintenance cost. The two parts of the sleeve member 15 can be connected by bolts. In addition, as an alternative embodiment, the sleeve member 15 can also be an integrated structure.

[0051] In addition, if Figure 1 As shown, this embodiment also provides a turboshaft engine ground test bench, including: a turboshaft engine 16, a power absorption measurement device 17 and the load release device described in the above scheme;

[0052] The load release device is arranged between the turboshaft engine 16 and the power absorption measuring device 17 , the driving shaft 2 of the load release device is connected to the turboshaft engine 16 , and the driven shaft 3 of the load release device is connected to the power absorption measuring device 17 .

[0053] The turboshaft engine ground test bench provided in this embodiment is connected to the turboshaft engine 16 and the power absorption measuring device 17 by a load release device, so that the turboshaft engine 16 and the power absorption measuring device 17 can be connected or disconnected, and no structure needs to be destroyed when disconnecting. It can be reused, which increases the service life and reduces the test cost.

[0054] The method for using the turboshaft engine ground test bench provided in this embodiment is as follows:

[0055] 1. First, current is input to the coil 19 through the brush ring 6. At this time, the iron core 18 will generate attraction for the armature 7. The armature 7 moves on the spline segment 14 toward the iron core 18, pushing the active connecting piece 4 and the driven connecting piece 5 to move. The multiple active connecting pieces squeeze the first elastic member 8, and the multiple driven connecting pieces 5 squeeze the second elastic member 9, thereby reducing the spacing. When the spacing is reduced to a certain extent, the multiple active connecting pieces 4 are embedded in the corresponding driven connecting pieces 5 to complete the connection.

[0056] 2. Then the turboshaft engine 16 can be started, and it can be connected to the power absorption measuring device 17 through the driving shaft 2 and the driven shaft 3. When separation is required, the input of current is stopped. At this time, the armature 7 will not be attracted, and the first elastic member 8 will push the multiple active connecting plates 4 to separate, and the second elastic member 9 will push the multiple driven connecting plates 5 to separate until they return to the initial state. The driving shaft 2 and the driven shaft 3 cannot be connected, and the turboshaft engine 16 and the power absorption measuring device 17 can be disconnected.

[0057] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present invention.

Claims

1. A load release device, characterized in that: include: A housing (1), wherein a driving shaft (2) and a driven shaft (3) are rotatably arranged in the housing (1), wherein the driving shaft (2) is suitable for being connected to an external driving device, and the driven shaft (3) is suitable for being connected to an external driven device; an active connecting piece (4) is connected to the driving shaft (2), and a driven connecting piece (5) is connected to the driven shaft (3), and the active connecting piece (4) and the driven connecting piece (5) are connected or disconnected by relative movement along the axial direction; The electromagnetic drive device comprises an armature (7) which can be driven to move by electromagnetic force, wherein the armature (7) is slidably mounted on the driving shaft (2) or the driven shaft (3), and the armature (7) drives the driving connecting piece (4) and / or the driven connecting piece (5) to move relative to each other in the axial direction so as to realize connection or disconnection between the driving connecting piece (4) and the driven connecting piece (5). The active connecting piece (4) and the driven connecting piece (5) comprise a plurality of pieces which are sequentially spaced apart from each other, a first elastic member (8) is arranged between the plurality of active connecting pieces (4), and a second elastic member (9) is arranged between the plurality of driven connecting pieces (5).

2. The load release device according to claim 1, characterized in that: Also includes: An elastic member, wherein the elastic member is connected to the active connecting piece (4) and / or the driven connecting piece (5), and the elastic member has an elastic force that drives the active connecting piece (4) and / or the driven connecting piece (5) to move relative to each other in the axial direction so as to release the connection between the active connecting piece (4) and the driven connecting piece (5).

3. The load release device according to claim 1, characterized in that: The active connecting piece (4) and the driven connecting piece (5) are connected by circumferential clamping after being embedded in each other.

4. The load release device according to claim 3, characterized in that: The center of the driven connecting piece (5) has a through hole (10) for embedding the active connecting piece (4), the circumference of the active connecting piece (4) is provided with a plurality of first clamping blocks (11) protruding outwards, and the circumference of the through hole (10) of the driven connecting piece (5) has a plurality of first clamping grooves (12) cooperating with the first clamping blocks (11).

5. The load release device according to claim 4, characterized in that: The end of the first clamping block (11) has a bite reinforcement portion (13) extending in the circumferential direction.

6. The load release device according to claim 1, characterized in that: The active connecting piece (4) is slidably connected to the active shaft (2) through key fitting.

7. The load release device according to claim 6, characterized in that: One end of the driving shaft (2) is provided with a spline section (14) for cooperating with the driving connecting piece (4), and the spline section (14) has a plurality of key structures evenly spaced in the circumferential direction.

8. The load release device according to claim 1, characterized in that: The driven connecting piece (5) is slidably connected to the driven shaft (3) through key fitting.

9. The load release device according to claim 8, characterized in that: One end of the driven shaft (3) is connected to a sleeve member (15), and the inner wall of the sleeve member (15) is provided with a plurality of key structures evenly spaced along the circumference for cooperating with the driven connecting piece (5).

10. The load release device according to claim 9, characterized in that: The sleeve member (15) has two detachable parts, one part is connected to the driven shaft (3), and the other part is connected to the driven connecting plate (5).

11. A turboshaft engine ground test bench, characterized in that: include: A turboshaft engine (16), a power absorption measuring device (17), and a load release device according to any one of claims 1 to 10; The load release device is arranged between the turboshaft engine (16) and the power absorption measuring device (17), the driving shaft (2) of the load release device is connected to the turboshaft engine (16), and the driven shaft (3) of the load release device is connected to the power absorption measuring device (17).

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