A method and device for testing the torque of an engine with equal precision and a large range

Abstract

The present application discloses a method and device for testing the torque of an engine with equal precision over a large range, which solves the problems of more segments and poor precision in the prior art for testing the torque of an aeroengine with equal precision over a large range. The method includes the steps of: dividing the torque measurement range of the aeroengine into a connected first measurement range and a second measurement range; adjusting the resistance mechanism of the first brake so that the first brake reaches the set measurement precision within the first measurement range; adjusting the resistance mechanism of the second brake so that the second brake reaches the set measurement precision within the second measurement range; changing the first measurement range and the second measurement range so that the measurement precision when measuring the torque of the aeroengine with the first brake and the second brake at the connection point of the first measurement range and the second measurement range tends to be the same; and rapid optical alignment, which can be adjusted to the required coaxiality with only one alignment.

Description

Technical Field

[0001] This application relates to the technical field of mechanical quantity measurement, and particularly to a method and device for equal-precision large-range torque measurement of an engine. Background Art

[0002] The mechanical system is mainly used to apply loads to the engine under two conditions of thrust and rotation, simulating its large-load working state. Therefore, the mechanical system can be subdivided into a blade thrust test system and an engine rotor torque and speed test system. Currently, the large-range 0-25000 Nm torque test platform for aero-engines is already a standard mechanical quantity measurement device, but it cannot meet the equal-precision requirements. Generally, it is measured in segments, such as 0-4000; 4000-10000; 10000-25000, and the test precision requirements for each segment are different.

[0003] Minimizing the cutting segments of the large-scale torque of 0-25000 Nm to achieve the same-precision measurement requirements in engineering has always been a problem to be solved in measurement technology. Summary of the Invention

[0004] This application provides a method and device for equal-precision large-range torque measurement of an engine, which solves the problem of too many segments and poor precision in the equal-precision large-range torque measurement of aero-engines in the prior art.

[0005] This application provides a method for equal-precision large-range torque measurement of an engine, which measures the torque of the aero-engine with a brake, and includes the steps of:

[0006] Dividing the torque measurement range of the aero-engine into connected first and second measurement ranges.

[0007] Adjusting the resistance mechanism of the first brake to make the first brake reach the set measurement precision within the first measurement range; adjusting the resistance mechanism of the second brake to make the second brake reach the set measurement precision within the second measurement range.

[0008] Changing the first and second measurement ranges so that the measurement precision when measuring the torque of the aero-engine with the first and second brakes at the connection point of the first and second measurement ranges tends to be the same.

[0009] Further, the drill pipe of the aero-engine to be measured is docked with the torque shaft of the brake, and the position relationship between the drill pipe and the torque shaft is calibrated using optical photography and image recognition, and the position of the aero-engine is feedback-adjusted to reduce the position deviation between the drill pipe and the torque shaft.

[0010] Further, the parameters of the deviation include: the distance between the end of the drill pipe and the end of the torque shaft; the angular difference between the drill pipe and the torque shaft in the axial direction.

[0011] Furthermore, the measurement range of the aero-engine torque includes 0 to 25000 Nm. The first measurement segment includes 0 to 5000 Nm. The second measurement segment includes 5000 to 25000 Nm.

[0012] Preferably, the first brake uses a rotary disk brake. The second brake uses a magnetic particle brake.

[0013] On the other hand, the present application also provides an engine equal-precision large-range torque testing device for implementing the above method, including a first brake, a second brake, an optical alignment system, and a brake loading structure. The optical alignment system includes a processor and multiple cameras, and the multiple cameras are respectively aligned with the positions where the drill pipe of the engine is docked with the torque shaft. The processor is used for image recognition, calculating the deviation between the drill pipe and the torque shaft, and sending out deviation indication information. The brake loading structure includes a torque sensor and a docking device. The torque shafts of the first brake or the second brake are sequentially connected to the torque sensor and the docking device, and are docked with the drill pipe of the engine to be tested.

[0014] Furthermore, the docking device includes a universal coupling. The two ends of the universal coupling are respectively connected to the drill pipe of the engine to be tested and the torque shaft.

[0015] Furthermore, the optical alignment system includes image recognition marks. The image recognition marks are respectively installed on the drill pipe and the torque shaft for identifying the positions of the drill pipe and the torque shaft.

[0016] Furthermore, it also includes a displacement device for: in response to the deviation indication information, adjusting the positions where the drill pipe and the torque shaft of the engine are docked to reduce the deviation.

[0017] Furthermore, it also includes: a horizontally arranged test platform, a first camera arranged at the coupling end of the torque shaft of the first brake, a second camera arranged at the coupling end of the torque shaft of the second brake, and a third camera arranged at the center of the top of the test platform. The first brake and the second brake are installed on the test platform, and the coupling ends of the torque shafts of the first brake and the second brake are respectively located at both ends of the test platform. The torque shafts of the first brake and the second brake are collinear. The first camera and the third camera are used to detect the alignment of the torque shaft of the first brake; the second camera and the third camera are used to detect the alignment of the torque shaft of the second brake.

[0018] The above at least one technical solution adopted in the embodiments of the present application can achieve the following beneficial effects:

[0019] Over a large torque range, there are fewer torque segments, and each segment has equal precision, which simplifies the test procedure. With rapid optical alignment, it only needs to be aligned once to adjust to the required coaxiality. The coaxiality of the connecting shaft after adjustment can reach 0.001 - 0.005 mm, improving the precision by several times. Description of the Drawings

[0020] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0021] Figure 1 is a flowchart of an equal-precision large-range torque test method for an engine of the present application;

[0022] Figure 2 is a structural diagram of an embodiment of an equal-precision large-range torque test device for an engine of the present application;

[0023] Figure 3 is a flowchart of an optical intelligent calibration method of the present application;

[0024] Figure 4 is a schematic diagram of an optical intelligent docking of the present application;

[0025] Figure 5 is a connection relationship diagram of a turntable brake load of the present application;

[0026] Figure 6 is a connection relationship diagram of a magnetic powder brake load of the present application. Detailed Description of the Embodiments

[0027] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0028] The following will detail the technical solutions provided by each embodiment of the present application in conjunction with the drawings.

[0029] Figure 1 is a flowchart of an equal-precision large-range torque test method for an engine of the present application.

[0030] An equal-precision large-range torque test method for an engine, which measures the torque of an aeroengine using a brake, includes the steps:

[0031] Step 101: Divide the torque measurement range of the aero-engine into a connected first measurement range and a second measurement range.

[0032] For example, the measurement range of the aero-engine torque includes 0 - 25000 Nm. Divide the measurement range of the aero-engine torque into a first measurement segment including 0 - 5000 Nm. The second measurement segment includes 5000 - 25000 Nm.

[0033] The large-range 0 - 25000 Nm torque test platform for aero-engines is already a standard mechanical quantity test device. Generally, it is segmented for measurement into 0 - 4000; 4000 - 10000; 10000 - 25000. The test accuracy requirements for each segment are different. Too low accuracy will cause the torque-speed curves of different segments not to align. Dividing 0 - 25000 Nm into two segments of 0 - 5000 Nm and 5000 - 25000 Nm, the fewer the segments, the higher the test accuracy requirements for each segment.

[0034] Step 102: Adjust the resistance mechanism of the first brake so that the first brake reaches the set measurement accuracy within the first measurement range; adjust the resistance mechanism of the second brake so that the second brake reaches the set measurement accuracy within the second measurement range.

[0035] For example, the first brake uses a disc brake. The second brake uses a magnetic powder brake.

[0036] Two different methods are adopted for torque loading - disc brake loading and magnetic powder brake loading.

[0037] The first brake uses a disc brake. The disc brake loading test system can perform loading on the drill pipe of the engine under test through manual adjustment (adjustment by knob) or automatic adjustment (control by the central console). The control circuit board outputs a 0 - 5V analog signal, which is docked with the pneumatic control system, so as to control the opening of the BUSHUO air valve to adjust the friction force and achieve torque loading.

[0038] The second brake uses a magnetic powder brake. The magnetic powder brake conveys torque based on the electromagnetic principle and uses magnetic powder. The conveyed torque is basically linearly related to the excitation current. The disc brake loading test system controls braking or torque transmission by adjusting the magnitude of the excitation current and has excellent adjustable performance. The magnetic powder brake has the advantages of fast response speed, simple structure, no pollution, and no noise.

[0039] The turntable brake has small inertia, fast action and high sensitivity, but poor stability, so it is suitable for testing 0-5000 Nm. The magnetic powder brake runs more smoothly and is more suitable for the 5000-25000 Nm segment. By using more suitable brakes for the two segments for testing, the test accuracy can be improved.

[0040] Step 103: Change the first measurement range and the second measurement range so that at the connection point of the first measurement range and the second measurement range, the measurement accuracies when measuring the torque of the aero-engine with the first brake and the second brake tend to be the same.

[0041] It should be noted that when the engine to be tested is docked with the brake, the accuracy of the alignment between the drill pipe of the engine and the torque shaft of the brake is an important factor affecting the test accuracy. Therefore, it must be accurately calibrated before docking.

[0042] The coaxiality of the existing calibration method can only reach 0.005-0.01 mm, which cannot meet the need of dividing the large range of 0-25000 Nm torque of the aero-engine into two segments. Under this coaxiality, the torque-speed curves of different segments cannot be aligned.

[0043] By relying on optical alignment calibration, the coaxiality can reach 0.001-0.005 mm, which can meet the need of dividing the large range of 0-25000 Nm torque of the aero-engine into two segments.

[0044] For example, when the drill pipe of the aero-engine to be tested is docked with the torque shaft of the brake, use optical photography and image recognition to calibrate the positional relationship between the drill pipe and the torque shaft, and feedback to adjust the position of the aero-engine to reduce the position deviation between the drill pipe and the torque shaft.

[0045] The parameters of the deviation include: the distance between the end of the drill pipe and the end of the torque shaft; the angular difference between the drill pipe and the torque shaft in the axial direction.

[0046] It should be noted that for the accuracy calibration of the motor dynamic torque test device, commercial equipment is equipped with an adjustment knob for calibrating the accuracy.

[0047] When performing the motor dynamic torque test, the measurement of the sensor torque value adopts the strain electrical measurement principle. When the strain shaft is slightly deformed under the influence of torsion, the resistance value of the strain gauge pasted on the strain shaft changes accordingly. Strain gauges with the same strain characteristics are used to form a measurement bridge, and the change of the strain resistance can be converted into the change of the voltage signal for measurement.

[0048] The measurement accuracy of torque is related to the loading technique, measurement range, and the structure of the test system. Under the conditions of the set loading technique and measurement range, coaxiality is the main factor affecting the test accuracy. The test accuracy can be optimized by adjusting the coaxiality. That is to say, there is a corresponding relationship between the coaxiality range and the accuracy range. It can be understood that it is impossible to achieve an ideal coaxiality of 0. Moreover, it is difficult (even impossible) for any loading technique to meet the desired test accuracy within a large test range. Reducing the coaxiality or increasing the test range both increase the test difficulty. Therefore, a reasonable compromise needs to be made between the test difficulty and the obtained torque measurement accuracy.

[0049] Figure 2 This is the structural diagram of an embodiment of an equal-precision large-range torque test device for an engine in this application.

[0050] An equal-precision large-range torque test device for an engine, used to implement the above method, includes a first brake 1 and a second brake 2 arranged coaxially, as well as an optical alignment system 3 and a brake loading structure 4.

[0051] It also includes a horizontally arranged test platform 6. The first brake and the second brake are arranged on the surface of the test platform, and the connection directions of the torque shafts are opposite. For example, the first brake conducts torque tests on the engine at the first end of the test platform and within the first measurement range, and the second brake conducts torque tests on the engine at the second end of the test platform and within the second measurement range. The torque shafts of the first brake or the second brake are sequentially connected to a torque sensor and a docking device, and are docked with the drill pipe 7 of the engine to be tested.

[0052] For example, the first brake adopts a turntable brake. The turntable brake loading test system can perform loading on the drill pipe of the engine to be tested through manual adjustment (adjustment through a knob) or automatic adjustment (controlled by a console). The control circuit board outputs a 0-5V analog signal, which is docked with the pneumatic control system, so as to control the opening of the BUSHUO air valve to adjust the friction force and achieve torque loading. The friction torque of the turntable brake loading test system is:

[0053] M = 4μF × r Formula 1

[0054] Where: μ is the friction coefficient of the turntable;

[0055] F is the normal pressure applied by the cylinder to the turntable;

[0056] r is the radius of the turntable.

[0057] The second brake uses a magnetic powder brake. A magnetic powder brake transmits torque based on the electromagnetic principle and utilizes magnetic powder. The transmitted torque has a basically linear relationship with the exciting current. The turntable brake loading test system controls braking or torque transmission by adjusting the magnitude of the exciting current and has excellent adjustable performance. The magnetic powder brake has the advantages of fast response speed, simple structure, no pollution, and no noise.

[0058] The optical alignment system includes three parts: a camera, image recognition, and position deviation adjustment. For example, the optical alignment system includes multiple cameras, a processor, and a displacement device.

[0059] The multiple cameras respectively align with the positions where the drill pipe of the engine is docked with the torque shaft.

[0060] For example, two of the cameras are angled to align with the positions where the drill pipe of the engine is docked with the torque shaft. The optical alignment system includes image recognition marks. The image recognition marks are respectively installed on the drill pipe and the torque shaft to identify the positions of the drill pipe and the torque shaft and enable the image recognition system to recognize the positions where the drill pipe and the torque shaft are located. The position deviation adjustment makes deviation adjustments based on the actual positions recognized by the image recognition.

[0061] The two cameras can be located at any unobstructed position that can effectively photograph the drill pipe and the torque shaft. The two cameras identify the positions of the image recognition marks installed on the drill pipe and the torque shaft through the image recognition system, and then calculate the positions where the drill pipe and the torque shaft are located by identifying the relative positions between the image recognition marks and the drill pipe and the torque shaft.

[0062] For example, the cameras include a first camera 31, a second camera 32, and a third camera 33. The first camera is located above the first brake and the second brake. A calibration column 5 is provided between the first brake and the second brake, and the first camera is located at the top of the column. The first camera rotates to face the torque shaft of the first brake and the torque shaft of the second brake respectively. The second camera is respectively located below the torque shaft of the first brake and the drill pipe. The third camera is respectively located below the torque shaft of the second brake and the drill pipe. The images of the first camera and the second camera, and the first camera and the third camera can identify the relative positions of the image recognition marks on one side of the torque shaft and the corresponding drill pipe through the image recognition system, thereby obtaining the positions where one side of the torque shaft and the corresponding drill pipe are located. By adjusting the first camera, the three cameras can be used to perform optical centering for the two brakes respectively, saving the cost of the cameras.

[0063] For example, both cameras are located above the first brake and the second brake, and both cameras can adjust their directions. By adjusting the directions of the two cameras, only two cameras can be used to center the two side brakes.

[0064] For another example, there is a vertical column between the first brake and the second brake, which is perpendicular to the test platform and faces upward. Above the column, there is a horizontal crossbar placed horizontally and perpendicular to the axis of the torque shaft. Two cameras are installed on the horizontal crossbar.

[0065] The processor 35, the image recognition part of the optical alignment system, calculates the deviation between the drill pipe and the torque shaft through image recognition and issues deviation indication information.

[0066] The displacement device 36, the position deviation adjustment part of the optical alignment system, is used to adjust the position of the docking of the drill pipe and the torque shaft of the engine in response to the deviation indication information to reduce the deviation.

[0067] For example, the test bench is configured with a hydraulic system that can be lifted horizontally, so that the center height of the shaft can be adjusted. At the same time, the engine mounting platform to be tested can be moved horizontally and vertically, so that the output rotating shaft can be moved and adjusted in both horizontal and vertical directions. Preferably, after the image recognition gives the data deviation value, the platform automatically controls the adjustment until it is within the required coaxiality range.

[0068] The brake loading structure includes a torque sensor and a docking device.

[0069] The torque sensor is used to detect the torsional moment of the drill pipe of the engine. The docking device is used to align the torque shaft and the drill pipe. For example, there are two sets of the torque sensor and the docking device, which are respectively connected to the first brake and the second brake.

[0070] The torque shaft of the first brake or the second brake sequentially passes through the torque sensor and the docking device and then docks with the drill pipe of the engine to be tested.

[0071] For example, the torque sensor is installed on the first brake or the second brake. When the torque shaft passes through the torque sensor and rotates, the torque sensor can measure the torsional moment of the torque shaft. After the torque shaft is docked with the drill pipe of the engine, the torque shaft and the drill pipe of the engine rotate coaxially after successful docking. Therefore, the torsional moment of the torque shaft is the torsional moment of the drill pipe.

[0072] The docking device includes a universal coupling. The two ends of the universal coupling are respectively connected to the drill pipe of the engine to be tested and the torque shaft.

[0073] Further, it further includes: a first camera disposed at the coupling end of the first brake torque shaft, a second camera disposed at the coupling end of the second brake torque shaft, and a third camera disposed at the center of the top of the test platform. The first brake and the second brake are installed on the test platform, and the coupling ends of the first brake torque shaft and the second brake torque shaft are respectively located at both ends of the test platform. The torque shafts of the first brake and the second brake are collinear. The first camera and the third camera are used to detect the alignment of the first brake torque shaft; the second camera and the third camera are used to detect the alignment of the second brake torque shaft.

[0074] Figure 3 This is a flowchart of an optical intelligent calibration method of the present application.

[0075] On the other hand, the present application further provides an optical intelligent calibration method for the above-mentioned engine and other high-precision large-range torque test devices, including the steps of:

[0076] Step 201: The optical alignment system calculates the deviation between the drill pipe and the torque shaft through image recognition technology.

[0077] The parameters for the optical alignment system to calculate the deviation include the distance between the end of the drill pipe and the end of the torque shaft and the angular difference between the drill pipe and the torque shaft in the axial direction. The optical intelligent alignment system observes the connection between the drill pipe and the test bench through two cameras, and uses image recognition technology to calculate the deviation (Y, θ) between the drill pipe and the test bench.

[0078] Wherein: Y is the distance between the drill pipe and the torque shaft;

[0079] θ is the angular difference between the drill pipe and the torque shaft.

[0080] Step 202: Adjust the alignment of the drill pipe and the torque shaft to the allowable error range.

[0081] It is displayed to the drill operator through the intelligent docking display to facilitate aligning the drill pipe with the test bench to the allowable error range and achieving an ideal docking effect.

[0082] Further, the parameters for the optical alignment system to calculate the deviation include the distance between the end of the drill pipe and the end of the torque shaft and the angular difference between the drill pipe and the torque shaft in the axial direction.

[0083] For rapid optical centering, rapid connection of the measured drill pipe to the torque shaft of the load. The connection of the drill pipe and the torque shaft in the traditional scheme is slow, and the experimental preparation time is long; due to the use of non-optical centering measurement technologies, such as coordinate measuring machines, adjustment is required after each measurement, and then measurement is carried out again after adjustment, repeating many times. For the optical centering of this scheme, after measurement, the control system can adjust to the required coaxiality at one time.

[0084] The coaxiality dimension between the drill pipe and the torque shaft in the traditional solution is large, resulting in a large moment error. In the past, the coaxiality of the connecting shaft could only reach 0.005 - 0.01 mm, and the connection was time-consuming and laborious; now, relying on optical alignment, the coaxiality can reach 0.001 - 0.005 mm, improving the accuracy by several times.

[0085] Figure 4 This is a schematic diagram of an optical intelligent docking for this application.

[0086] As Figure 4 shown, the optical intelligent alignment system observes the connection between the drill pipe and the test bench through two cameras, and uses image recognition technology to calculate the deviation (Y, θ) between the drill pipe and the test bench.

[0087] It is displayed to the drill operator through the intelligent docking display to facilitate aligning the drill pipe with the test bench within the allowable error range to achieve an ideal docking effect.

[0088] The aligned drill pipe and the torque shaft are connected together through a universal coupling.

[0089] Figure 5 This is a connection relationship diagram of the rotary table brake loading for this application.

[0090] The first brake uses a rotary table brake. The rotary table brake loading test system can perform loading on the drill pipe of the engine to be tested through manual adjustment (adjusted by a knob) or automatic adjustment (controlled by the console). The control circuit board outputs a 0 - 5V analog signal, which is docked with the pneumatic control system, so as to control the opening of the BUSHUO air valve to adjust the friction force and achieve torque loading. The friction torque of the rotary table brake loading test system is as shown in Formula 1.

[0091] After passing through the torque sensor, the torque shaft of the rotary table brake is docked with the drill pipe of the aeroengine clamped by the drill pipe gripper and connected together through a universal coupling. This process can be docked using the above optical alignment system or other intelligent docking devices, which will not be further limited here.

[0092] Figure 6 This is a connection relationship diagram of the magnetic particle brake loading for this application.

[0093] The second brake uses a magnetic particle brake. The magnetic particle brake conveys torque according to the electromagnetic principle and uses magnetic powder. The conveyed torque is basically linearly related to the exciting current. The rotary table brake loading test system controls the braking or torque transmission by adjusting the magnitude of the exciting current and has excellent adjustable performance. The magnetic particle brake has the advantages of fast response speed, simple structure, no pollution, no noise, etc.

[0094] After passing through the torque sensor, the torque shaft of the magnetic powder brake is docked with the drill pipe of the aero-engine clamped by the drill pipe gripper, and they are connected together through a universal coupling. In this process, an optical alignment system or other intelligent docking devices can be selected for docking, which will not be further limited here.

[0095] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A method for testing the torque of an engine with equal precision and a large range, which measures the torque of an aeroengine using a brake, is characterized in that, Including the steps: Dividing the torque measurement range of the aero-engine into a connected first measurement range and a second measurement range; Adjusting the resistance mechanism of the first brake so that the first brake reaches the set measurement accuracy within the first measurement range; Adjusting the resistance mechanism of the second brake so that the second brake reaches the set measurement accuracy within the second measurement range; Changing the first measurement range and the second measurement range so that the measurement accuracies of measuring the aero-engine torque with the first brake and the second brake tend to be the same at the connection point of the first measurement range and the second measurement range; For the drill pipe docking brake torque shaft of the aero-engine to be measured, use optical photography and image recognition to calibrate the positional relationship between the drill pipe and the torque shaft, and feedback to adjust the position of the aero-engine to reduce the positional deviation between the drill pipe and the torque shaft.

2. The method for testing the torque of an engine with equal precision and a large range according to claim 1, is characterized in that, The parameters of the deviation include: the distance between the end of the drill pipe and the end of the torque shaft; the angular difference between the drill pipe and the torque shaft axially.

3. The method for testing the torque of an engine with equal precision and a large range according to claim 1, is characterized in that, The measurement range of the aero-engine torque includes 0 to 25000 Nm; The first measurement range includes 0 to 5000 Nm; The second measurement range includes 5000 to 25000 Nm.

4. The method for testing the torque of an engine with equal precision and a large range according to claim 1, is characterized in that, The first brake adopts a turntable brake; The second brake adopts a magnetic powder brake.

5. An engine torque testing device with equal precision and a large range, which is used to implement the method described in any one of claims 1 - 4, is characterized in that, Including a first brake, a second brake, an optical alignment system and a brake loading structure; The optical alignment system includes a processor and multiple cameras, and the multiple cameras are respectively aligned with the positions where the drill pipe of the engine is docked with the torque shaft; the processor is used for image recognition, calculating the deviation between the drill pipe and the torque shaft and sending out deviation indication information; The brake loading structure includes a torque sensor and a docking device; The torque shaft of the first brake or the second brake is sequentially connected to the torque sensor and the docking device, and is docked with the drill pipe of the engine to be measured.

6. The engine torque testing device with equal precision and a large range according to claim 5, is characterized in that, The docking device includes a universal coupling; Both ends of the universal coupling are respectively connected to the drill pipe and the torque shaft of the engine to be measured.

7. The engine torque testing device with equal precision and a large range according to claim 5, is characterized in that, The optical alignment system includes image recognition marks; The image recognition marks are respectively installed on the drill pipe and the torque shaft for identifying the positions of the drill pipe and the torque shaft.

8. The engine torque testing device with equal precision and a large range according to claim 5, is characterized in that, It also includes a displacement device for; Responding to the deviation indication information, adjusting the positions where the drill pipe and the torque shaft of the engine are docked to reduce the deviation.

9. The engine torque testing device with equal precision and a large range according to any one of claims 5 - 8, is characterized in that, It also includes: A horizontally arranged test platform, a first camera arranged at the coupling end of the torque shaft of the first brake, a second camera arranged at the coupling end of the torque shaft of the second brake, and a third camera arranged at the center of the top of the test platform; the first brake and the second brake are installed on the test platform, and the coupling ends of the torque shafts of the first brake and the second brake are respectively located at both ends of the test platform; The torque shafts of the first brake and the second brake are collinear; The first camera and the third camera are used to detect the alignment of the torque shaft of the first brake; the second camera and the third camera are used to detect the alignment of the torque shaft of the second brake.

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