A micro turbojet engine test stand

Abstract

The utility model discloses a kind of micro turbojet engine test bed, belong to engine test bed field, including test module and measurement and control module, the test module includes: test bed base module;Movable frame support module, it is set on the test bed base module;Movable frame, it is hung and connected on the movable frame support module by spring piece;For fixed engine engine mounting, it is set on the movable frame. For the existing turbojet engine structure fixation, it is difficult to move, cannot satisfy multiple test working condition and the interference of existing slide rail structure in the process of thrust transmission, the utility model takes the design of high portability, strong extension ability, suitable for engine test in different working condition environment, and the movable frame suspension structure of the utility model avoids the influence of slide rail structure to thrust, so that thrust measurement precision is high, can more accurately and comprehensively test micro turbojet engine, so that development, production efficiency and quality are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of engine test benches, specifically relating to a micro turbojet engine test bench. Background Technology

[0002] In the research and development and production of micro turbojet engines with thrust below 25 kgf, in order to comprehensively and accurately measure the engine's performance, it is necessary to test the engine under different temperatures and atmospheric pressures to obtain data. Therefore, the following problems exist: 1. Traditional turbojet engine testing is generally carried out on test benches in indoor test rooms. However, indoor test rooms can only provide limited engine operating conditions, and the test bench structure is fixed, making it difficult to move to different operating environments for use, thus failing to meet the engine testing needs under multiple operating conditions; 2. During the thrust transmission process, due to gravity, elasticity, and other external interferences, the thrust measured by the thrust sensor may be inconsistent with the actual thrust of the engine. Therefore, it is necessary to develop a micro turbojet engine test bench to meet research needs. Utility Model Content

[0003] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0004] To achieve these objectives and other advantages of this utility model, a micro turbojet engine test bench is provided, comprising a test module and a measurement and control module, wherein the test module includes: Test bench base module; The moving frame support module is mounted on the test bench base module; The movable frame is suspended and connected to the movable frame support module by spring plates; An engine mounting bracket for securing the engine is mounted on the moving frame.

[0005] Preferably, the test bench base module includes: Test bench base; Multiple sets of fixing holes are respectively provided on both the front and rear ends of the test bench base; Multiple sets of front horizontal adjustment screws are located on both sides of the front end of the test bench base; The rear horizontal adjustment screw is located in the middle of the rear end of the test bench base. A bubble level is located at the center of the front end of the test bench base.

[0006] Preferably, the movable frame support module includes: Multiple sets of movable frame supports are arranged in pairs and connected to the test bench base. The movable frame supports are connected to the upper end of the spring plate. A movable frame limiting screw is inserted into the rear movable frame support, and the end of the movable frame limiting screw abuts against the movable frame. The movable frame locking hand-tightening screw passes through the front movable frame support; Multiple sets of grip handles are connected to the upper part of the multiple sets of movable frame supports via hand-tightening nuts installed on the handles; The movable frame is suspended and connected to the multiple sets of movable frame supports by the spring plates.

[0007] Preferably, the movable frame includes: Two sets of longitudinal beams, with the lower ends of the spring plates and pads connected to both ends of each beam, are suspended between the two movable frame supports. A transverse beam is located between the front ends of the two sets of longitudinal beams, and both ends of the transverse beam are connected to the front ends of the two sets of longitudinal beams respectively.

[0008] Preferably, the engine mounting bracket includes: Multiple sets of sliding rods, with their two ends supported on the two sets of longitudinal beams via sliding rod supports; Multiple sets of engine mounting plates are arranged opposite each other between the two sets of longitudinal beams. The multiple sets of engine mounting plates are slidably connected to the multiple sets of slide rods through slide rod sleeves. The space where the multiple sets of engine mounting plates are arranged opposite each other is used for installing engines. The width-adjusting bidirectional lead screw is divided into two threaded sections with opposite thread directions. Both ends of the width-adjusting bidirectional lead screw pass through the two sets of longitudinal beams, and the two sets of longitudinal beams are respectively provided with through holes that match the two ends of the width-adjusting bidirectional lead screw. The width-adjusting bidirectional lead screw can rotate freely relative to the two sets of longitudinal beams. Both ends of the width-adjusting bidirectional lead screw are provided with width adjustment knobs. One side of the engine mounting plate has a first internal thread limiting sleeve fixedly connected to its lower end, and the other side of the engine mounting plate has a second internal thread limiting sleeve fixedly connected to its lower end. The two threaded sections of the width-adjusting bidirectional lead screw are respectively matched with the internal threads of the first internal thread limiting sleeve and the second internal thread limiting sleeve.

[0009] Preferably, the engine mounting plate includes: The mounting plate body is slidably connected to the multiple sets of slide rods via a slide rod sleeve; The mounting strip is located above the mounting plate body. The mounting strip has locking hand-tightening screws at both ends and a stop pin in the middle. Both the locking hand-tightening screws and the stop pin are connected to the mounting plate body. Abrasion-resistant isolation post is located between the mounting strip and the mounting plate body, and the abrasion-resistant isolation post is sleeved on the stop pin; A temporary plugging seat is located on the front wall of the mounting plate body on one side; An engine speed sensor bracket is located on the front wall of the mounting plate body on the other side, and the engine speed sensor bracket is provided with a bracket position locking knob.

[0010] Preferably, the measurement and control module includes: A thrust sensor is located in front of the moving frame, and the thrust sensor is mounted on the test stand base module; The electronic measurement and control module is located at the front end of the test bench base module; The electronic measurement and control module housing covers the thrust sensor, the electronic measurement and control module, and the outer periphery of the crossbeam; the electronic measurement and control module housing is connected to the test bench base. An intake air temperature sensor, the top of which is located at the engine air intake, is mounted on the housing of the electronic measurement and control module. Multiple sets of exhaust temperature sensors are located at the engine exhaust port and are connected to the test bench base module. An engine speed sensor is mounted on the top of the engine speed sensor bracket. A parameter display screen is mounted on one side of the handle, and the parameter display screen is connected to the electronic measurement and control module. The electronic measurement and control module is connected to the thrust sensor, intake air temperature sensor, multiple sets of exhaust air temperature sensors and engine speed sensor.

[0011] Preferably, the plurality of exhaust temperature sensors includes: Multiple sets of thermocouple brackets are located on both sides of the rear end of the test bench base module, and the multiple sets of thermocouple brackets are connected to the test bench base module; Multiple sets of temperature measuring thermocouples are clamped and mounted on the multiple sets of thermocouple brackets.

[0012] This utility model has at least the following beneficial effects: 1. This utility model is suitable for engine testing under different working conditions; 2. The moving frame of this utility model forms a suspension structure by cooperating with the moving frame support through the spring plate, which avoids the influence of the slide rail structure on the thrust. Furthermore, by cooperating with the bubble level and the level adjustment screw, the influence of gravity on the thrust measurement can be eliminated, which has the advantage of high thrust measurement accuracy. 3. This utility model also has the advantage of strong scalability, which can test engines more accurately and comprehensively, provide more reliable data for engine research and development and production, and greatly improve the efficiency and quality of research and development and production.

[0013] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the structure of this utility model; Figure 3 This is a schematic diagram of the left rear side view of the moving frame support module of this utility model; Figure 4 This is a schematic diagram of the left front side view of the moving frame support module of this utility model; Figure 5 This is a schematic diagram of the right front side view of the moving frame structure of this utility model; Figure 6 This is a top view schematic diagram of the moving frame structure of this utility model; Figure 7 This is a top view of the engine mounting bracket of this utility model. Figure 8 This is a schematic diagram of the right side of the engine mounting bracket of this utility model; Figure 9 This is a schematic diagram of the left side view of the engine mounting bracket of this utility model; Figure 10 This is a schematic cross-sectional view of the engine mounting bracket of this utility model; Figure 11 This is a side view of the structure of this utility model; Figure 12 This is a schematic diagram of the measurement and control module structure of this utility model; The attached diagram is labeled as follows: 1. Test bench module; 2. Test bench base module; 3. Moving frame support module; 4. Moving frame; 5. Spring plate; 6. Engine mounting bracket; 7. Measurement and control module; 201. Test bench base; 202. Multiple sets of fixing holes; 203. Multiple sets of front leveling screws; 204. Rear leveling screws; 205. Bubble level; 303. Multiple sets of moving frame supports; 304. Moving frame limit screws; 305. Moving frame locking hand screws; 306. Multiple sets of handles; 307. Handle installation hand nuts; 401. Two sets of longitudinal beams; 402. Transverse beam; 403. Multiple sets of slide rods; 404. Slide rod support; 601. Multiple sets of engine mounting plates; 602. Slide rod retainer; 603. Adjustment... Wide bidirectional lead screw; 604, First internal thread limit sleeve; 605, Width adjustment knob; 606, Mounting plate body; 607, Mounting pressure strip; 608, Locking hand screw; 609, Stop pin; 610, Anti-abrasion isolation post; 611, Temporary pipe plug seat; 612, Second internal thread limit sleeve; 701, Thrust sensor; 702, Electronic measurement and control module; 703, Intake air temperature sensor; 704, Multiple sets of exhaust air temperature sensors; 705, Multiple sets of thermocouple brackets; 706, Multiple sets of exhaust temperature measuring thermocouples; 707, Engine speed sensor; 708, Engine speed sensor bracket; 709, Bracket position locking knob; 710, Electronic measurement and control module housing; 711, Parameter display screen. Detailed Implementation The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description. It should be understood that terms such as "having," "comprising," and "including" as used herein do not imply the presence or addition of one or more other elements or combinations thereof. It should be noted that in the description of the present invention, the terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description; they 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, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "on top" can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0015] Figures 1 to 12 This invention discloses a micro turbojet engine test stand, comprising a test module 1 and a measurement and control module 7. The test module 1 includes: Test bench base module 2; The moving frame support module 3 is mounted on the test bench base module 2; The movable frame 4 is suspended from the movable frame support module 3 by spring plates 5; An engine mounting bracket 6 for securing the engine is mounted on the moving bracket 4.

[0016] Working principle: In actual operation, the moving frame support module 3 is set on the test bench base module 2. The moving frame 4 is suspended and connected to the moving frame support module 3 through the spring plate 5. The engine is fixed on the moving frame 4 through the engine mounting bracket 6. After the engine is started, the moving frame 4 will be displaced under the action of the engine thrust, and then the data will be collected by the measurement and control module 7. This has the advantages of improving the accuracy of data acquisition and increasing the adaptability of the equipment to the site.

[0017] In the above technical solutions, such as Figure 2 As shown, the test bench base module 2 includes: Test bench base 201; Multiple sets of fixing holes 202 are respectively provided on the front and rear ends of the test bench base 201; Multiple sets of front horizontal adjustment screws 203 are located on both sides of the front end of the test bench base 201; The rear horizontal adjustment screw 204 is located in the middle of the rear end of the test bench base 201; The bubble level 205 is located at the front center of the test bench base 201.

[0018] Working principle: In actual operation, the test bench base 201 is leveled by adjusting multiple sets of front leveling screws 203 and rear leveling screws 204 and observing the bubble level 205. It can also be fixed to different test sites through multiple sets of fixing holes 202, thereby meeting the testing requirements of the engine under different environments and working conditions and maintaining the engine's level state during testing. This has the advantages of improving testing efficiency and increasing site adaptability.

[0019] In the above technical solutions, such as Figure 3 and Figure 4 As shown, the moving frame support module 3 includes: Multiple sets of movable frame supports 303 are arranged in pairs and connected to the test bench base 201. The movable frame supports 303 are connected to the upper end of the spring sheet 5. The movable frame limiting screw 304 is inserted into the rear movable frame support 303, and the end of the movable frame limiting screw 304 abuts against the movable frame 4. The movable frame locking hand screw 305 is inserted into the front movable frame support 303; Multiple sets of grip handles 306 are connected above the multiple sets of movable frame supports 303 via handle mounting hand-tightening nuts 307; The movable frame 4 is suspended and connected to the multiple sets of movable frame supports 303 by the spring sheet 5.

[0020] Working principle: In actual operation, the moving frame 4 is suspended and connected to multiple moving frame supports 303 via spring plates 5. Under the action of engine thrust, the moving frame 4 will generate displacement in the opposite direction of thrust. The moving frame limit screws 304 installed on the moving frame supports 303 can prevent the moving frame 4 from displacing too much by abutting against the moving frame 4, thereby avoiding plastic deformation of the spring plates 5. This also prevents the plastic deformation of the spring plates 5 from affecting the accuracy of the thrust measurement on the test bench. By adjusting the moving frame locking hand screws 305 that pass through the moving frame supports 203 and the moving frame limit screws 304, the moving frame 4 can be locked and limited to prevent shaking during transportation and damage to the equipment. The installation of multiple sets of handles 306 facilitates the lifting and transfer of the equipment, which has the advantages of reducing equipment wear and facilitating equipment transfer.

[0021] In the above technical solutions, such as Figure 5 and Figure 6 As shown, the movable frame 4 includes: Two sets of longitudinal beams 401 are connected at both ends to the lower end of the spring sheet 5 and the washer, and the longitudinal beams 401 are suspended between the two moving frame supports 303; A transverse beam 402 is located between the front ends of the two sets of longitudinal beams 401, and both ends of the transverse beam 402 are respectively connected to the front ends of the two sets of longitudinal beams 401.

[0022] Working principle: In actual operation, multiple sets of moving frame supports 303 are set in pairs and connected to the test bench base 201. Two sets of longitudinal frame beams 401 are suspended between the two moving frame supports 303 by spring plates 5. The transverse frame beam 402 connects the two sets of longitudinal frame beams 401 into a frame, forming a structure in which the moving frame supports 303 and the moving frame 4 is suspended by spring plates 5. The engine is fixed on the moving frame 4 by the engine mounting bracket 6, so that this utility model realizes the railless design, which can eliminate the thrust measurement error caused by rail obstruction and track parallelism deviation, and has the advantages of improving data accuracy and reducing the impact of error.

[0023] In the above technical solutions, such as Figures 6 to 9 As shown, the engine mounting bracket 6 includes: Multiple sets of sliding rods 403 are mounted on the two sets of longitudinal beams 401 via sliding rod supports 404 at both ends; Multiple sets of engine mounting plates 601 are disposed opposite to each other between the two sets of longitudinal beams 401, and the multiple sets of engine mounting plates 601 are slidably connected to the multiple sets of slide rods 403 through slide rod sleeves 602; The width-adjusting bidirectional lead screw 603 is divided into two threaded sections with opposite thread directions. Both ends of the width-adjusting bidirectional lead screw 603 are respectively inserted into the two sets of longitudinal beams 401. The two sets of longitudinal beams 401 are correspondingly provided with through holes that mate with both ends of the width-adjusting bidirectional lead screw 603. The width-adjusting bidirectional lead screw 603 can rotate freely relative to the two sets of longitudinal beams 401. Both ends of the width-adjusting bidirectional lead screw 603 are provided with width adjustment knobs 605. One side of the engine mounting plate 601 has a first internal thread limiting sleeve 604 fixedly connected to its lower end, and the other side of the engine mounting plate 601 has a second internal thread limiting sleeve 612 fixedly connected to its lower end. The two threaded sections of the width-adjusting bidirectional lead screw 603 are respectively matched with the internal threads of the first internal thread limiting sleeve 604 and the second internal thread limiting sleeve 612.

[0024] Working principle: In actual operation, the space between multiple sets of engine mounting plates 601 is used to install engines. The two ends of the width-adjusting bidirectional lead screw 603 pass through the corresponding through holes of the two sets of longitudinal beams 401, and the width-adjusting bidirectional lead screw 603 can rotate freely relative to the two sets of longitudinal beams 401. Both ends of the width-adjusting bidirectional lead screw 603 are provided with width adjustment knobs 605. When it is necessary to adjust the space between multiple sets of engine mounting plates 601, rotate the width adjustment knob 605 on either side to rotate the width-adjusting bidirectional lead screw 603. With the cooperation of the two opposite threaded sections of the bidirectional lead screw 603 and the first internal thread limiting sleeve 604 and the second internal thread limiting sleeve 612, the multiple sets of engine mounting plates 601 are driven to slide on the multiple sets of sliding rods 403 in opposite directions. This makes the present invention adaptable to various engine sizes, which has the advantages of increasing the applicability of the equipment and optimizing the structure of the experimental equipment.

[0025] In the above technical solutions, such as Figure 10 and Figure 11 As shown, the engine mounting plate 601 includes: Mounting plate body 606, the mounting plate body 606 is slidably connected to the plurality of sliding rods 403 through sliding rod sleeve 602; The mounting strip 607 is located above the mounting plate body 606. The mounting strip 607 has locking hand screws 608 at both ends and a stop pin 609 in the middle. Both the locking hand screws 608 and the stop pin 609 are connected to the mounting plate body. Abrasion-resistant isolation post 610 is located between the mounting strip 607 and the mounting plate body 606, and the abrasion-resistant isolation post 610 is sleeved on the stop pin; Temporary pipe plug 611 is located on the front wall of the mounting plate body 606 on one side; An engine speed sensor bracket 708 is located on the front wall of the mounting plate body 606 on the other side, and a bracket position locking knob 709 is provided on the engine speed sensor bracket 708.

[0026] Working principle: In actual operation, the engine is installed by adjusting the locking hand screw 608 and the stop pin 609 to install the mounting strip 607 and the engine onto the mounting plate body 606. The engine speed sensor 707 is mounted on the engine speed sensor bracket 708 to detect the engine speed in real time. The temporary pipe plug seat 611 set on the front wall of the mounting plate body 606 is used for the insertion of the fuel supply pipe in the idle state to seal the pipe and prevent fuel leakage. This ensures the stability and safety of the engine installation system of this utility model, and has the advantages of increasing the stability of engine installation and optimizing the structure of experimental equipment.

[0027] In the above technical solutions, such as Figure 11 and Figure 12 As shown, the measurement and control module 7 includes: A thrust sensor 701 is located in front of the moving frame 4, and the thrust sensor 701 is mounted on the test bench base module 2. The electronic measurement and control module 702 is located at the front end of the test bench base module 2; The electronic measurement and control module housing 710 covers the outer periphery of the thrust sensor 701, the electronic measurement and control module 702 and the crossbeam 402, and the electronic measurement and control module housing 710 is connected to the test bench base 201. An intake air temperature sensor 703 is located at the top of the engine air intake, and the intake air temperature sensor 703 is mounted on the electronic measurement and control module housing 710. Multiple sets of exhaust temperature sensors 704 are located at the engine exhaust port and are connected to the test bench base module 2. An engine speed sensor 707 is disposed at the top of the engine speed sensor bracket 708; A parameter display screen 711 is mounted on the grip handle 306 on one side, and the parameter display screen 711 is connected to the electronic measurement and control module 702. The electronic measurement and control module 702 is connected to the thrust sensor 701, the intake air temperature sensor 703, the multiple exhaust air temperature sensors 704, and the engine speed sensor 707.

[0028] Working principle: In actual operation, various data need to be collected. The thrust sensor 701 is equipped with a round-headed screw for bearing force. It lightly touches the moving frame 4 but does not bear force. After the engine is started, the thrust sensor 701 records the thrust from the moving frame 4 under the action of the engine thrust. At the same time, the intake air temperature sensor 703, multiple exhaust air temperature sensors 704, engine speed sensor 707 and electronic measurement and control module 702 respectively collect the engine intake air temperature, exhaust air temperature, engine speed, ambient temperature and ambient air pressure. This has the advantages of improving test efficiency and optimizing the structure of experimental equipment.

[0029] In the above technical solutions, such as Figure 11 As shown, the multiple sets of exhaust temperature sensors 704 include: Multiple sets of thermocouple brackets 705 are located on both sides of the rear end of the test bench base module 2, and the multiple sets of thermocouple brackets 705 are connected to the test bench base module 2. Multiple sets of temperature measuring thermocouples 706 are clamped and mounted on the multiple sets of thermocouple brackets 705.

[0030] Working principle: In actual operation, multiple sets of exhaust temperature measuring thermocouples 706 are clamped at the rear of the engine through multiple sets of thermocouple brackets 705 to measure the engine exhaust temperature, thus obtaining the engine exhaust temperature.

[0031] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A micro turbojet engine test bench, comprising a test module and a measurement and control module, characterized in that, The test module includes: Test bench base module; The moving frame support module is mounted on the test bench base module; The movable frame is suspended and connected to the movable frame support module by spring plates; An engine mounting bracket for securing the engine is mounted on the moving frame.

2. The micro turbojet engine test stand as described in claim 1, characterized in that, The test bench base module includes: Test bench base; Multiple sets of fixing holes are respectively provided on both the front and rear ends of the test bench base; Multiple sets of front horizontal adjustment screws are located on both sides of the front end of the test bench base; The rear horizontal adjustment screw is located in the middle of the rear end of the test bench base. A bubble level is located at the center of the front end of the test bench base.

3. The micro turbojet engine test stand as described in claim 2, characterized in that, The movable frame support module includes: Multiple sets of movable frame supports are arranged in pairs and connected to the test bench base. The movable frame supports are connected to the upper end of the spring plate. A movable frame limiting screw is inserted into the rear movable frame support, and the end of the movable frame limiting screw abuts against the movable frame. The movable frame locking hand-tightening screw passes through the front movable frame support; Multiple sets of grip handles are connected to the upper part of the multiple sets of movable frame supports via hand-tightening nuts installed on the handles; The movable frame is suspended and connected to the multiple sets of movable frame supports by the spring plates.

4. The micro turbojet engine test stand as described in claim 3, characterized in that, The movable frame includes: Two sets of longitudinal beams, with the lower ends of the spring plates and pads connected to both ends of each beam, are suspended between the two movable frame supports. A transverse beam is located between the front ends of the two sets of longitudinal beams, and both ends of the transverse beam are connected to the front ends of the two sets of longitudinal beams respectively.

5. The micro turbojet engine test stand as described in claim 4, characterized in that, The engine mounting bracket includes: Multiple sets of sliding rods, with their two ends supported on the two sets of longitudinal beams via sliding rod supports; Multiple sets of engine mounting plates are disposed opposite to each other between the two sets of longitudinal beams, and the multiple sets of engine mounting plates are slidably connected to the multiple sets of slide rods through slide rod sleeves; The width-adjusting bidirectional lead screw is divided into two threaded sections with opposite thread directions. Both ends of the width-adjusting bidirectional lead screw pass through the two sets of longitudinal beams, and the two sets of longitudinal beams are respectively provided with through holes that match the two ends of the width-adjusting bidirectional lead screw. The width-adjusting bidirectional lead screw can rotate freely relative to the two sets of longitudinal beams. Both ends of the width-adjusting bidirectional lead screw are provided with width adjustment knobs. One side of the engine mounting plate has a first internal thread limiting sleeve fixedly connected to its lower end, and the other side of the engine mounting plate has a second internal thread limiting sleeve fixedly connected to its lower end. The two threaded sections of the width-adjusting bidirectional lead screw are respectively matched with the internal threads of the first internal thread limiting sleeve and the second internal thread limiting sleeve.

6. The micro turbojet engine test stand as described in claim 5, characterized in that, The engine mounting plate includes: The mounting plate body is slidably connected to the multiple sets of slide rods via a slide rod sleeve; The mounting strip is located above the mounting plate body. The mounting strip has locking hand-tightening screws at both ends and a stop pin in the middle. Both the locking hand-tightening screws and the stop pin are connected to the mounting plate body. Abrasion-resistant isolation post is located between the mounting strip and the mounting plate body, and the abrasion-resistant isolation post is sleeved on the stop pin; A temporary plugging seat is located on the front wall of the mounting plate body on one side; An engine speed sensor bracket is located on the front wall of the mounting plate body on the other side, and the engine speed sensor bracket is provided with a bracket position locking knob.

7. The micro turbojet engine test stand as described in claim 6, characterized in that, The measurement and control module includes: A thrust sensor is located in front of the moving frame, and the thrust sensor is mounted on the test stand base module; The electronic measurement and control module is located at the front end of the test bench base module; The electronic measurement and control module housing covers the thrust sensor, the electronic measurement and control module, and the outer periphery of the crossbeam; the electronic measurement and control module housing is connected to the test bench base. An intake air temperature sensor, the top of which is located at the engine air intake, is mounted on the housing of the electronic measurement and control module. Multiple sets of exhaust temperature sensors are located at the engine exhaust port and are connected to the test bench base module. An engine speed sensor is mounted on the top of the engine speed sensor bracket. A parameter display screen is mounted on one side of the handle, and the parameter display screen is connected to the electronic measurement and control module. The electronic measurement and control module is connected to the thrust sensor, intake air temperature sensor, multiple sets of exhaust air temperature sensors and engine speed sensor.

8. The micro turbojet engine test stand as described in claim 7, characterized in that, The multiple sets of exhaust temperature sensors include: Multiple sets of thermocouple brackets are located on both sides of the rear end of the test bench base module, and the multiple sets of thermocouple brackets are connected to the test bench base module; Multiple sets of temperature measuring thermocouples are clamped and mounted on the multiple sets of thermocouple brackets.

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