Self-centering force measuring device
By designing a self-aligning force measuring device, the problem of difficult disassembly and assembly of existing force measuring components is solved, enabling rapid disassembly and assembly and high-precision measurement, and adapting to the testing needs of various engine interfaces.
Patent Information
- Application Number
- CN202511335684.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2025-12-02
AI Technical Summary
Existing force measurement components have long replacement cycles, poor maintainability, and are difficult to disassemble and assemble, which affects the development progress.
Design a self-centering force measuring device, including a fixed frame, a moving frame and a transition frame, which achieves self-centering positioning through the cooperation of positioning components, simplifying the disassembly and assembly process and improving positioning accuracy and efficiency.
It enables rapid assembly and disassembly of the force measurement components, improves the development progress, enhances measurement accuracy and device rigidity, and adapts to the testing requirements of different engine interfaces.
Smart Images
Figure CN121048809A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aerospace engine thrust measurement technology, specifically to a self-aligning force measurement device. Background Technology
[0002] Thrust measurement devices, as an important type of testing equipment, have wide applications in engine research and development. With the continuous pursuit of engine performance, the demands and requirements for measurement equipment are also increasing. As a crucial component of the thrust measurement system, the force measurement assembly can provide dynamic testing for engines operating for extended periods and with high-frequency ignition in practical applications.
[0003] The force measuring assembly consists of a fixed frame, a working sensor, a moving frame, an adapter frame, and heat insulation components. The dimensions of each component and the sensor range can be adjusted according to different task requirements. Each component of the force measuring assembly is positioned and calibrated using external auxiliary equipment to ensure that each component is coaxially set.
[0004] However, as the difficulty and precision of space exploration missions continue to increase, more types of engines need to be tested using thrusters. Existing force measurement components have long replacement cycles, poor maintainability, and are not easy to disassemble and assemble, which in turn causes problems such as slowing down the development progress. Summary of the Invention
[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that existing force measuring components are not easy to disassemble and assemble, which affects the development progress, thereby providing a self-aligning force measuring device.
[0006] To address the aforementioned technical problems, this invention provides a self-aligning force measuring device, comprising: a fixed frame, a movable frame, and a transfer frame. The fixed frame is used to connect to an external test platform. A first positioning element cooperating with the external test platform is provided on a first side of the fixed frame. A working sensor is detachably connected to a second side of the fixed frame, and a second positioning element for positioning the working sensor is provided on the second side of the fixed frame. The movable frame is detachably disposed at the end of the working sensor away from the fixed frame. A third positioning element for positioning the working sensor is provided on a first side of the movable frame, and the third positioning element and the second positioning element are disposed opposite to each other. A fourth positioning element is provided on the second side of the movable frame. The transfer frame is detachably disposed on the side of the movable frame away from the sensor. A fifth positioning element cooperating with the fourth positioning element is provided on the transfer frame. The transfer frame is used to mount the engine to be tested.
[0007] In use, the first end of the working sensor is positioned and installed on the fixed frame via the second positioning component, and the moving frame is positioned and installed on the second end of the working sensor via the third positioning component. The fourth and fifth positioning components work together to position the adapter frame and the moving frame. The entire assembly is then positioned and installed on the outer platform via the first positioning component on the second side of the fixed frame. High positioning accuracy is ensured without external assistance, thus achieving self-alignment during assembly and disassembly, improving efficiency. The self-aligning force measuring device provided by this invention solves the problem of existing force measuring components being difficult to assemble and disassemble, which affects the development progress.
[0008] Optionally, multiple working sensors are evenly arranged along the circumference of the fixed frame. This arrangement allows data from multiple working sensors to corroborate each other, improving measurement accuracy. Furthermore, the multiple working sensors increase the overall rigidity of the force measuring device, enhancing its frequency response.
[0009] Optionally, the first, second, and third positioning components are configured as positioning bosses. The peripheral frame has a first positioning groove that mates with the first positioning component. The first end of the working sensor has a second positioning groove that mates with the second positioning component, and the second end of the working sensor has a third positioning groove that mates with the third positioning component. With this configuration, the second positioning component on the fixed frame is embedded in the second positioning groove at the first end of the working sensor, and the working sensor is positioned and installed on the fixed frame. The third positioning component on the moving frame is embedded in the third positioning groove at the second end of the working sensor, and the moving frame is positioned and installed at the second end of the working sensor. After the entire assembly is completed, the first positioning component on the fixed frame is embedded in the first positioning groove of the peripheral frame, allowing the entire assembly to be positioned and installed on the peripheral frame, achieving self-alignment during assembly and disassembly, and improving efficiency.
[0010] Optionally, the moving frame is configured as a ring structure, and the fourth positioning element is configured as a flange arranged circumferentially on the inner side of the moving frame; the adapter frame is configured as a hollow frustum structure, and the fifth positioning element is a ring structure disposed at the bottom of the adapter frame, with the inner side of the ring of the fifth positioning element fitting against the outer side of the fourth positioning element. Through the above configuration, the fifth positioning element at the bottom of the adapter frame is configured as a ring structure, fitted onto the outer side of the fourth positioning element, and the inner side of the ring of the fifth positioning element and the outer side of the flange of the fourth positioning element form a hole-shaft fit. The adapter frame is positioned and installed on the moving frame, achieving self-alignment between the adapter frame and the moving frame.
[0011] Optionally, the adapter frame further includes a mounting portion and a connecting portion. The mounting portion is used to mount the engine, and the connecting portion is disposed between the mounting portion and the fifth positioning member. The mounting portion is a circular plate-shaped structure, and the connecting portion has multiple legs evenly arranged circumferentially. Through this configuration, the connecting portion connects the circular plate-shaped mounting portion and the annular fifth positioning member, forming a hollow frustum-shaped structure. The engine under test is mounted on the mounting portion, and the multiple legs evenly arranged circumferentially through the connecting portion can evenly transmit thrust to the moving frame.
[0012] Optionally, the mounting section is provided with an adapter flange for mounting the engine under test. With this configuration, when testing engines with different interfaces, only the adapter flange needs to be replaced, improving the adaptability of the force measuring device. Furthermore, testing the replaced force measuring device does not require the installation of an additional excitation hammer impact plate.
[0013] Optionally, a central groove is provided at the center of the contact surface between the adapter flange and the engine under test. This central groove allows the excitation hammer to strike the force measuring device during testing, effectively preventing damage to the mounting surfaces of the adapter flange and the engine under test.
[0014] Optionally, a counterweight is provided on the adapter flange, and the counterweight has a flange detachably connected to the adapter flange in its circumferential direction. With this configuration, the counterweight simulates the mass of the engine under test. Before installing the engine under test, the counterweight is connected to the adapter flange via the flange to perform a force test on the entire force measuring device. After the test is passed, the counterweight is removed, and then the engine under test is installed for a thrust test.
[0015] Optionally, a first heat insulation plate is provided between the fifth positioning member and the moving frame. Through this arrangement, the first heat insulation plate can block heat conduction between the adapter and the moving frame, reducing the impact of the engine combustion chamber temperature on the working sensor and improving the measurement accuracy of the force measuring device.
[0016] Optionally, a second heat insulation plate is provided between the adapter flange and the adapter frame. With this arrangement, the second heat insulation plate can block heat conduction between the adapter flange and the adapter frame, forming a secondary blockage with the first heat insulation plate for contact-type heat conduction. This reduces the impact of the engine combustion chamber temperature on the working sensor and improves the measurement accuracy of the force measuring device. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of one embodiment of the centering force measuring device provided in this invention. Figure 2 for Figure 1 A schematic diagram of the central frame; Figure 3 for Figure 1 A cross-sectional schematic diagram; Figure 4 for Figure 1 An explosion diagram.
[0019] Explanation of reference numerals in the attached figures: 1. Fixed frame; 11. First positioning component; 12. Second positioning component; 2. Moving frame; 21. Third positioning component; 22. Fourth positioning component; 3. Working sensor; 4. Adapter frame; 41. Fifth positioning component; 42. Mounting part; 43. Connecting part; 5. Adapter flange; 51. Central groove; 6. Counterweight; 7. First heat insulation plate; 8. Second heat insulation plate. Detailed Implementation
[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0023] Furthermore, 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.
[0024] This embodiment provides a structure for a self-aligning force measuring device that can maintain high alignment accuracy and rigidity even after repeated disassembly and use, for rocket engine thrust testing.
[0025] like Figure 1 The diagram illustrates a specific implementation of a self-aligning force measuring device provided in this embodiment, comprising: a fixed frame 1, a movable frame 2, and a transition frame 4. The fixed frame 1 is used to connect to an external platform. A first positioning element 11 that cooperates with the external platform is provided on the first side of the fixed frame 1. A working sensor 3 is detachably connected to the second side of the fixed frame 1. A second positioning element 12 for positioning the working sensor 3 is provided on the second side of the fixed frame 1. The movable frame 2 is detachably disposed at the end of the working sensor 3 away from the fixed frame 1. A third positioning element 21 for positioning the working sensor 3 is provided on the first side of the movable frame 2. The third positioning element 21 and the second positioning element 12 are disposed opposite to each other. A fourth positioning element 22 is provided on the second side of the movable frame 2. The transition frame 4 is detachably disposed on the side of the movable frame 2 away from the sensor. A fifth positioning element 41 that cooperates with the fourth positioning element 22 is provided on the transition frame 4. The transition frame 4 is used to mount the engine to be tested.
[0026] In use, the first end of the working sensor 3 is positioned and installed on the fixed frame 1 via the second positioning member 12, and the moving frame 2 is positioned and installed on the second end of the working sensor 3 via the third positioning member 21. Through the positioning cooperation of the fourth positioning member 22 and the fourth and fifth positioning members, the adapter frame 4 is positioned and installed with the moving frame 2. The entire assembly is positioned and installed on the peripheral platform by the first positioning member 11 on the second side of the fixed frame 1. High positioning accuracy can be guaranteed without external assistance, thereby achieving self-alignment during assembly and disassembly, improving efficiency. The self-aligning force measuring device provided in this embodiment solves the problem that existing force measuring components are difficult to assemble and disassemble, thus affecting the development progress.
[0027] Specifically, such as Figure 1 , Figure 2 As shown, the fixed frame 1 is configured as a plate structure, and the fixed frame 1 serves as the reference for the entire force measuring device. The center hole of the fixed frame 1 is used to reserve space for the calibration mechanism.
[0028] like Figure 1 , Figure 3 , Figure 4 As shown, in the self-aligning force measuring device provided in this embodiment, multiple working sensors 3 are evenly arranged along the circumferential direction on the fixed frame 1. The data from multiple working sensors 3 can corroborate each other, improving measurement accuracy. At the same time, the multiple working sensors 3 make the overall rigidity of the force measuring device higher, which can improve the frequency response of the device itself. Alternatively, as an alternative implementation, only one working sensor 3 can be provided.
[0029] Specifically, such as Figure 4 As shown, there are three working sensors 3 arranged circumferentially, and three second positioning members 12 on the fixed frame 1 and three third positioning members 21 on the moving frame 2 are evenly arranged at 120° along the same circumference.
[0030] Specifically, such as Figure 2 As shown, the fixed frame 1 has 3 sets of 4 countersunk holes, totaling 12, corresponding to the second positioning member 12, for fixing the working sensor 3. The fixed frame 1 has three outwardly extending fixing plates on its periphery, and each fixing plate has two plates, totaling six, for the overall installation of the force measuring device.
[0031] Specifically, such as Figure 4 As shown, the moving frame 2 has 3 sets of 4 countersunk holes, totaling 12, corresponding to the third positioning member 21, for fixing the moving frame 2 onto the assembly formed by the working sensor 3 and the fixed frame 1.
[0032] like Figure 3As shown, in the self-aligning force measuring device provided in this embodiment, the first positioning member 11, the second positioning member 12, and the third positioning member 21 are configured as positioning bosses. A first positioning groove cooperating with the first positioning member is provided on the outer frame. A second positioning groove cooperating with the second positioning member 12 is provided at the first end of the working sensor 3, and a third positioning groove cooperating with the third positioning member 21 is provided at the second end of the working sensor 3. The second positioning member 12 on the fixed frame 1 is embedded in the second positioning groove at the first end of the working sensor 3, and the working sensor 3 is positioned and installed on the fixed frame 1. The third positioning member 21 on the moving frame 2 is embedded in the third positioning groove at the second end of the working sensor 3, and the moving frame 2 is positioned and installed at the second end of the working sensor 3. After the entire assembly is completed, the first positioning member 11 on the fixed frame 1 is embedded in the first positioning groove of the outer frame, enabling the entire assembly to be positioned and installed on the outer frame, achieving self-alignment during assembly and disassembly, and improving efficiency. Alternatively, as an alternative implementation, the first positioning member 11, the second positioning member 12, and the third positioning member 21 can also be configured as positioning grooves, and the working sensor 3 and the peripheral frame are provided with positioning bosses that cooperate with the positioning grooves.
[0033] like Figure 4 As shown, in the self-aligning force measuring device provided in this embodiment, the moving frame 2 is configured as a ring structure, and the fourth positioning member 22 is configured as a flange arranged circumferentially on the inner side of the moving frame 2; the adapter frame 4 is configured as a hollow frustum structure, and the fifth positioning member 41 is a ring structure disposed at the bottom of the adapter frame 4, with the inner side of the ring of the fifth positioning member 41 fitting against the outer side of the fourth positioning member 22. The fifth positioning member 41 at the bottom of the adapter frame 4 is configured as a ring structure, and the fifth positioning member 41 is sleeved on the outer side of the fourth positioning member 22. The inner side of the ring of the fifth positioning member 41 and the outer side of the flange of the fourth positioning member 22 form a hole-shaft fit. The adapter frame 4 is positioned and installed on the moving frame 2 to achieve self-alignment between the adapter frame 4 and the moving frame 2. Alternatively, as an alternative embodiment, the fifth positioning member 41 can also be configured as a plate structure, with a groove provided on the fifth positioning member 41 for the fourth positioning member 22 to be embedded.
[0034] Specifically, such as Figure 4As shown, the fourth positioning element 22 consists of three flanges evenly arranged circumferentially. These three flanges are uniformly arranged in a circular ring, cut at a certain central angle, and evenly distributed at 120° intervals along the circumference. The angle between the fourth positioning element 22 and the third positioning element 21 along the circumference is 30°. Each of the fourth positioning elements 22 has threaded holes on both sides for connection with the adapter frame 4. The fifth positioning element 41 has three sets of six through holes, which correspond to the threaded holes on the fourth positioning elements 22.
[0035] like Figure 1 , Figure 3 , Figure 4 As shown, in the self-aligning force measuring device provided in this embodiment, the adapter frame 4 further includes: a mounting part 42 and a connecting part 43. The mounting part 42 is used to mount the engine, and the connecting part 43 is disposed between the mounting part 42 and the fifth positioning member 41. The mounting part 42 is configured as a circular plate structure, and the connecting part 43 has a plurality of legs evenly arranged along the circumference. The connecting part 43 connects the circular plate structure of the mounting part 42 and the annular structure of the fifth positioning member 41 to form a hollow frustum structure. The engine to be tested is mounted on the mounting part 42, and the thrust can be evenly transmitted to the moving frame 2 through the plurality of legs evenly arranged along the circumference of the connecting part 43. Alternatively, as an alternative embodiment, the connecting part 43 can also be configured as a continuous barrel structure.
[0036] Specifically, the legs of the connecting part 43 are hollow frustum-shaped structures cut at a certain central angle, with three legs evenly distributed at 120° intervals along the circumference. The mounting part 42 is provided with threaded holes for mounting the engine under test.
[0037] like Figure 1 , Figure 3 , Figure 4 As shown, in the self-aligning force measuring device provided in this embodiment, the mounting part 42 is provided with an adapter flange 5 for mounting the engine under test. When testing engines with different interfaces, only the adapter flange 5 needs to be replaced, improving the adaptability of the force measuring device. Furthermore, testing the replaced force measuring device does not require the installation of an additional excitation hammer impact plate. Alternatively, as an alternative implementation, the adapter flange 5 can be omitted, and the engine under test can be directly mounted on the mounting part 42.
[0038] Specifically, the adapter flange 5 is provided with a through hole for connecting to the adapter frame 4 and a screw hole for connecting the engine to be tested.
[0039] like Figure 3 , Figure 4As shown, in the self-aligning force measuring device provided in this embodiment, a central groove 51 is provided at the center of the contact surface between the adapter flange 5 and the engine under test. The central groove 51 is used for the excitation hammer to strike the force measuring device during testing, which can effectively avoid damage to the mounting surfaces of the adapter flange 5 and the engine under test. Alternatively, as an alternative implementation, the central groove 51 can be omitted, and the excitation hammer directly strikes the adapter flange 5 during the test.
[0040] like Figure 1 , Figure 3 , Figure 4 As shown, in the self-aligning force measuring device provided in this embodiment, a counterweight 6 is provided on the adapter flange 5. The counterweight 6 has a flange detachably connected to the adapter flange 5 in its circumferential direction. The counterweight 6 simulates the mass of the engine under test. Before installing the engine under test, the counterweight 6 is connected to the adapter flange 5 through the flange to perform a force test on the entire force measuring device. After the test is passed, the counterweight 6 is removed, and then the engine under test is installed for a thrust test.
[0041] Specifically, the counterweight 6 is configured as a hollow barrel structure so that the center of gravity of the counterweight 6 is adjusted to a position relatively far from the adapter flange 5. The outer wall and inner hole of the counterweight 6 are machined according to the mass and center of gravity position of the engine to be tested.
[0042] Specifically, such as Figure 1 , Figure 4 As shown, the counterweight 6 has a through hole on its flange, which is used to connect with the bolt hole on the adapter flange 5 by bolt.
[0043] It should be noted that before installing the engine under test for the actual thrust test, the force measuring device will be tested twice. The engine under test will not be installed in either test. In the first test, the counterweight 6 will not be installed and the test will only be conducted on the force measuring device itself. In the second test, the counterweight 6 will be installed. The counterweight 6 will simulate the overall mass and center of gravity after the engine under test is installed. After both tests are passed, the counterweight 6 will be removed and the engine under test will be installed for the thrust test.
[0044] like Figure 1 , Figure 3 , Figure 4 As shown, in the self-aligning force measuring device provided in this embodiment, a first heat insulation plate 7 is provided between the fifth positioning member 41 and the moving frame 2. The first heat insulation plate 7 can block the heat conduction between the adapter frame 4 and the moving frame 2, reduce the influence of the combustion chamber temperature of the engine under test on the working sensor 3, and improve the measurement accuracy of the force measuring device. Specifically, the first heat insulation plate 7 is made of honeycomb aluminum plate and is configured as a ring structure.
[0045] like Figure 1 , Figure 3 , Figure 4 As shown, in the self-aligning force measuring device provided in this embodiment, a second heat insulation plate 8 is provided between the adapter flange 5 and the adapter frame 4. The second heat insulation plate 8 can block the heat conduction between the adapter flange 5 and the adapter frame 4, forming a secondary blockage with the first heat insulation plate 7 for contact heat conduction, reducing the influence of the combustion chamber temperature of the engine under test on the working sensor 3, and improving the measurement accuracy of the force measuring device. Specifically, the second heat insulation plate 8 is made of honeycomb aluminum plate, and the mounting part 42 of the adapter frame 4 is shaped by the second heat insulation plate 8.
[0046] How to use: like Figure 1 As shown, the self-aligning force measuring device provided in this embodiment, during use, positions the working sensor 3 on the fixed frame 1 by embedding the second positioning member 12 into the second positioning groove, and positions the moving frame 2 on the assembly formed by the working sensor 3 and the fixed frame 1 by embedding the third positioning member 21 into the third positioning groove. The adapter frame 4 is positioned on the moving frame 2 by the hole-shaft cooperation of the first and fifth positioning members 41. After assembly, the entire assembly is positioned and installed on the peripheral platform by positioning the first positioning member 11 on the second side of the fixed frame 1, ensuring high positioning and alignment accuracy without external assistance. The first heat insulation plate 7 placed between the moving frame 2 and the adapter frame 4 and the second heat insulation plate 8 placed between the adapter flange 5 and the adapter frame 4 provide secondary blocking of contact heat conduction. The engine under test is mounted on the adapter frame 4 through the adapter flange 5.
[0047] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A self-aligning force measuring device, characterized in that, include: A fixed frame (1) is used to connect to an outer platform. A first positioning element (11) that cooperates with the outer platform is provided on the first side of the fixed frame (1). A working sensor (3) is detachably connected to the second side of the fixed frame (1). A second positioning element (12) for positioning the working sensor (3) is provided on the second side of the fixed frame (1). The movable frame (2) is detachably disposed at one end of the working sensor (3) away from the fixed frame (1). A third positioning member (21) for positioning the working sensor (3) is provided on the first side of the movable frame (2). The third positioning member (21) and the second positioning member (12) are disposed opposite to each other. A fourth positioning member (22) is provided on the second side of the movable frame (2). The adapter (4) is detachably mounted on the side of the moving frame (2) away from the sensor. The adapter (4) is provided with a fifth positioning element (41) that cooperates with the fourth positioning element (22). The adapter (4) is used to mount the engine to be tested.
2. The self-aligning force measuring device according to claim 1, characterized in that, The working sensors (3) are evenly arranged along the circumferential direction on the fixed frame (1).
3. The self-aligning force measuring device according to claim 1 or 2, characterized in that, The first positioning member (11), the second positioning member (12) and the third positioning member (21) are configured as positioning bosses. The outer frame is provided with a first positioning groove that cooperates with the first positioning member. The first end of the working sensor (3) is provided with a second positioning groove that cooperates with the second positioning member (12). The second end of the working sensor (3) is provided with a third positioning groove that cooperates with the third positioning member (21).
4. The self-aligning force measuring device according to claim 1 or 2, characterized in that, The moving frame (2) is configured as a ring structure, and the fourth positioning member (22) is configured as a flange arranged circumferentially on the inner side of the moving frame (2); The adapter (4) is configured as a hollow frustum structure, and the fifth positioning member (41) is a ring structure set at the bottom of the adapter (4). The inner side of the ring of the fifth positioning member (41) is in contact with the outer side of the fourth positioning member (22).
5. The self-aligning force measuring device according to claim 4, characterized in that, The adapter (4) further includes: a mounting part (42) and a connecting part (43). The mounting part (42) is used to mount the engine to be tested. The connecting part (43) is disposed between the mounting part (42) and the fifth positioning member (41). The mounting part (42) is configured as a circular plate structure. The connecting part (43) has multiple legs evenly arranged along the circumference.
6. The self-aligning force measuring device according to claim 5, characterized in that, The mounting part (42) is provided with an adapter flange (5) for mounting the engine to be tested.
7. The self-aligning force measuring device according to claim 6, characterized in that, The center of the contact surface between the adapter flange (5) and the engine under test is provided with a central groove (51).
8. The self-aligning force measuring device according to claim 6, characterized in that, The transition flange (5) is provided with a counterweight (6), and the counterweight (6) is provided with a flange that is detachably connected to the transition flange (5) in the circumferential direction.
9. The self-aligning force measuring device according to claim 8, characterized in that, A first heat insulation plate (7) is provided between the fifth positioning member (41) and the moving frame (2).
10. The self-aligning force measuring device according to claim 9, characterized in that, A second heat insulation plate (8) is provided between the mounting part (42) and the adapter frame (4).