Engine and reverse drag torque detection system coaxial alignment device

Abstract

The application provides a coaxial alignment device of an engine and a reverse drag torque detection system, and relates to the technical field of engine cold test pre-installation, which comprises a butt joint bottom plate, a fixed bottom plate, an assembly top plate, a cold flow test device, a fixed base, a movable base, an engine, a connecting rod, a hydraulic cylinder C, a hydraulic cylinder D, a hydraulic cylinder B and a hydraulic cylinder A. A limiting groove is formed on the top of one end of the fixed bottom plate, and a supporting strip is slidably connected in the limiting groove. The technical key points are as follows: the axis of the connecting disc on the engine and the axis of the test gear on the cold flow test device are located in the same horizontal plane, the axis of the engine is corrected to the horizontal plane, the axis of the engine is corrected to the vertical plane, the axis of the connecting disc on the engine is opposite to the axis of the test gear on the cold flow test device, and when the test gear on the cold flow test device approaches the connecting disc on the engine, stable and rapid butt joint can be ensured.

Description

Technical Field

[0001] This invention relates to the field of engine cold test pre-assembly technology, specifically a coaxial alignment device for an engine and a reverse torque detection system. Background Technology

[0002] An engine is a machine that converts other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, and electric motors. Internal combustion engines, for example, typically convert chemical energy into mechanical energy. The term "engine" can refer to both the power-generating device and the entire machine including the power unit (e.g., gasoline engine, aircraft engine).

[0003] Cold flow testing is a tool used to detect errors in the final assembly process and defects in engine parts. Strictly speaking, cold testing technology is a quality inspection method, a technique for comprehensively testing various systems after engine assembly. When using cold testing technology to test an engine, the engine does not require fuel to run or coolant to cool it. The engine under test enters the test bench, and the engine's intake and exhaust ports are clamped by cylinders or hydraulic cylinders. Simultaneously, it is connected to the equipment through a dedicated oil pressure adapter, and the engine's flywheel or adapter is automatically clamped by grippers or other clamping mechanisms. The test bench's servo motor drives the engine to rotate at different speeds. At the same time, the testing system collects data from the engine's intake and exhaust ports, the torque sensors of the clamping mechanism, and the pressure sensor at the main oil passage outlet through a data acquisition card. The collected test data is analyzed by the test bench's dedicated software, and then the analysis results are compared with the test bench's pre-set limit values ​​to determine whether the engine has been assembled correctly.

[0004] In engine cold testing technology, the connection between the engine and the testing system is particularly important. When the engine and torque sensor axes are not parallel, the peak of the torsional torque waveform will increase; when the engine and torque sensor axes are parallel but not concentric, the zero point of the torsional torque will shift, resulting in torque distortion. When the coupling experiences large deformation, the angular phase and instantaneous speed will lag; when the coupling experiences angular slippage, the angular phase will be misaligned, thus causing angular phase distortion.

[0005] In the current cold testing process for engines, the engine to be tested needs to be fixed with a clamp first, and then aligned with the test device by controlling the lifting of the engine. During this process, the angle deviation of the engine clamping and fixing is prone to occur. When aligned with the test device, there is always a certain error, making it difficult to achieve rapid docking. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this application provides a coaxial alignment device for an engine and a reverse torque detection system. A hydraulic cylinder B uses a latching block to push a connecting rod upwards, thereby moving the movable bases at both ends of the connecting rod upwards until the axis of the connecting plate mounted on the engine and the axis of the test gear on the cold flow testing device are in the same horizontal plane. A hydraulic cylinder C controls the support bar to slide inside the limiting groove, causing the mounting top plate hinged to the top of the support bar to correct the engine's axis to a vertical plane. A hydraulic cylinder D controls the mounting top plate to rotate around its hinge point with the support bar, causing the mounting top plate to correct the engine's axis to a horizontal plane, achieving the technical effect of precise alignment between the test gear and the connecting plate pre-installed on the engine.

[0007] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0008] A coaxial alignment device for an engine and a reverse torque detection system includes a docking base plate, a fixed base plate, and an assembly top plate. A cold flow testing device is assembled and connected to the top of the docking base plate.

[0009] The top plate is mounted on top of the bottom plate.

[0010] Fixed bases are assembled and connected to the four corners of the top of the assembly top plate. Each of the four fixed bases is provided with a movable base. An engine is provided on the top of each of the four movable bases. The four movable bases are combined in pairs, and an integral connecting rod is formed between the tops of the two movable bases.

[0011] A limiting groove is machined on the top of one end of the fixed base plate, and a support strip is slidably connected inside the limiting groove;

[0012] Hydraulic cylinder C is provided between the support bar and the fixed base plate; hydraulic cylinder D is connected between the fixed base plate and the assembly top plate by a universal joint; hydraulic cylinder B is provided between the connecting rod and the top of the assembly top plate; and hydraulic cylinder A is provided between the docking base plate and the fixed base plate.

[0013] In one possible implementation, a connecting plate is provided inside one end of the engine. The connecting plate is cross-shaped, and positioning seats are assembled and connected to each of the four corners of the connecting plate. A buckle is machined in the middle of one side of the connecting plate. A test gear is assembled and connected inside one end of the cold flow testing device. The buckle and the four positioning seats are pre-assembled into the inside of one end of the engine. When the cold flow testing device on the top of the docking base plate is controlled by hydraulic cylinder A to drive the test gear to dock with the connecting plate, the cold flow testing device drives the test gear, the positioning seats on the connecting plate and the buckle to rotate.

[0014] In one possible implementation, a receiving groove A is machined inside one end of the docking base plate, and a vertical plate is integrally formed on the top of one end of the docking base plate. A corner plate is assembled and connected to one end of the hydraulic cylinder A. The other end of the hydraulic cylinder A is bolted to the inner wall of one end of the receiving groove A and the surface of one side of the vertical plate. The corner plate is bolted to the top corner of one end of the fixed base plate.

[0015] In one possible implementation, the docking base plate has multiple guide columns machined at one end of the test gear. The multiple guide columns are symmetrically arranged on both sides of the hydraulic cylinder A. The docking base plate drives the multiple guide columns to slide and connect inside the fixed base plate.

[0016] In one possible implementation, the bottom of both sides of the docking base plate is machined with a storage groove A, and multiple rollers A are assembled and connected to the top inner wall of the two storage grooves A. The plane where the bottom of the multiple rollers A is located is the same as the plane where the bottom of the fixed base plate is located.

[0017] In one possible implementation, each of the four fixed bases has two guide columns machined on its top. One end of the hydraulic cylinder B is fastened to the center of the bottom of the connecting rod by a fastener block and is assembled and fixed with the connecting rod. The other end of the hydraulic cylinder B is assembled and connected to the top of the mounting plate, controlling the connecting rod to drive the two movable bases to slide outside the guide columns on the top of the corresponding fixed bases.

[0018] In one possible implementation, the fixed base plate has a storage slot B machined inside. The storage slot B is T-shaped. A universal joint connected to one end of the hydraulic cylinder D is assembled to the inner wall of one end of the storage slot B, and a universal joint connected to the other end of the hydraulic cylinder D is assembled to the bottom surface of the mounting top plate.

[0019] In one possible implementation, the support bar is arc-shaped, with its center located at the connection point between the connecting disc and the test gear. One end of the hydraulic cylinder C is hinged to the side of one end of the support bar, and the other end of the hydraulic cylinder C is hinged to the inner wall of one side of the receiving slot B.

[0020] In one possible implementation, the bottom of the support bar is machined with a storage groove B, and a plurality of rollers B are assembled and connected to the top inner wall of the storage groove B, and the plurality of rollers B are tactilely connected to the bottom inner wall of the limiting groove.

[0021] In one possible implementation, the top of each of the four movable bases is fitted with a contour seat B, and the top of the two contour seats B near the docking base plate is fitted with a contour seat A. The contour seats B and contour seats A are contoured and adapted to the bolt mounting and fixing positions on the engine.

[0022] The beneficial effects of this application are as follows:

[0023] Firstly, in this solution, hydraulic cylinder B uses a buckle block to push the connecting rod upwards, thereby causing the movable bases at both ends of the connecting rod to move upwards until the axis of the connecting plate assembled on the engine and the axis of the test gear on the cold flow test device are in the same horizontal plane; hydraulic cylinder C controls the support bar to slide inside the limiting groove, so that the assembly top plate hinged to the top of the support bar drives the axis of the engine to be corrected to a vertical plane; and hydraulic cylinder D controls the assembly top plate to rotate around its hinge point with the support bar, so that the assembly top plate corrects the axis of the engine to a horizontal plane, which can make the test gear and the connecting plate pre-installed on the engine accurately and quickly dock.

[0024] Secondly, in this solution, by making multiple guide columns machined to one end of the docking base plate slide inside the fixed base plate, when the hydraulic cylinder A is assembled between the docking base plate and the fixed base plate, it can be ensured that the axis of the engine in the aligned state and the axis of the test gear on the cold flow test device are in the same vertical plane, and are not restricted by the engine being lifted up and down or the tail swinging left and right. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a coaxial alignment device for an engine and a reverse torque detection system according to the present invention;

[0026] Figure 2 This is an exploded schematic diagram of the connecting disc, test gear, and engine of the coaxial alignment device for an engine and a reverse torque detection system according to the present invention.

[0027] Figure 3 This is one of the schematic diagrams of the connection structure of the fixed base plate and the docking base plate of the coaxial alignment device for the engine and the reverse torque detection system according to the present invention;

[0028] Figure 4 This is the second schematic diagram of the connection structure of the fixed base plate and the docking base plate of the coaxial alignment device for the engine and the reverse torque detection system according to the present invention;

[0029] Figure 5 This is a schematic diagram of the connection structure between the fixed base and the movable base of the coaxial alignment device for the engine and the reverse torque detection system according to the present invention;

[0030] Figure 6 This is a cross-sectional view of the mounting top plate of the coaxial alignment device for the engine and the reverse torque detection system according to the present invention;

[0031] Figure 7 This is a schematic diagram of the support bar for a coaxial alignment device of an engine and a reverse torque detection system according to the present invention.

[0032] Reference numerals: 1. Engine; 2. Test device; 3. Assembly top plate; 4. Support bar; 5. Limiting groove; 6. Fixed base plate; 7. Guide column; 8. Docking base plate; 9. Connecting plate; 10. Test gear; 11. Positioning seat; 12. Buckle plate; 13. Vertical plate; 14. Hydraulic cylinder A; 15. Storage slot A; 16. Angle plate; 17. Contouring seat B; 18. Connecting rod; 19. Fixed base; 20. Movable base; 21. Contouring seat B; 22. Hydraulic cylinder B; 23. Storage slot A; 24. Roller A; 25. Hydraulic cylinder C; 26. Storage slot B; 27. Hydraulic cylinder D; 28. Guide column; 29. ​​Buckle block; 30. Roller B; 31. Storage slot B. Detailed Implementation

[0033] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0034] Example:

[0035] This embodiment describes the specific structure of a coaxial alignment device for an engine and a reverse torque detection system. See details below. Figures 1-7 As shown, it includes:

[0036] The top is equipped with a docking base plate 8, a fixed base plate 6 and an assembly top plate 3 on the top of the docking base plate 8. Fixed bases 19 are assembled and connected at the four corners of the top of the assembly top plate 3. Movable bases 20 are provided on the top of the four fixed bases 19. Engine 1 is provided on the top of the four movable bases 20. The four movable bases 20 are combined in pairs, and an integral connecting rod 18 is formed between the tops of the two movable bases 20.

[0037] like Figure 2 As shown, a connecting plate 9 is provided inside one end of the engine 1. The connecting plate 9 is cross-shaped. Positioning seats 11 are assembled and connected at the four corners of the connecting plate 9. A buckle 12 is machined in the middle of one side of the connecting plate 9. A test gear 10 is assembled and connected inside one end of the cold flow test device 2.

[0038] In this process, by assembling (pre-installing) the buckle plate 12 and the four positioning seats 11 into the interior of one end of the engine 1, when the cold flow test device 2 on the top of the docking base plate 8 is controlled by the hydraulic cylinder A14 to drive the test gear 10 to dock with the connecting plate 9, the cold flow test device 2 can drive the test gear 10 to rotate the connecting plate 9 connected to the test gear 10. Furthermore, the positioning seats 11 and buckle plate 12 on the connecting plate 9 can drive the components inside the engine 1 to work, thereby supporting the engine cold flow test.

[0039] like Figure 1 As shown, a limiting groove 5 is machined on the top of one end of the fixed base plate 6, and a support strip 4 is slidably connected inside the limiting groove 5;

[0040] Among them, such as Figure 6 As shown, a hydraulic cylinder C25 is installed between the support bar 4 and the fixed base plate 6. The fixed base plate 6 has a receiving groove B26 machined inside. The receiving groove B26 is T-shaped, and the support bar 4 is arc-shaped. By positioning the center of the support bar 4 at the connection point between the connecting plate 9 and the test gear 10, when one end of the hydraulic cylinder C25 is hinged to the side of one end of the support bar 4 and the other end of the hydraulic cylinder C25 is hinged to the inner wall of one side of the receiving groove B26, the support bar 4 can be controlled to rotate around the center inside the limiting groove 5 through the hydraulic cylinder C25. This adjusts the alignment of the engine 1 on the top of the mounting plate 3 with the cold flow test device 2, preventing the axis inside the engine 1 from intersecting the axis inside the cold flow test device 2 in the horizontal projection plane.

[0041] Secondly, in order to reduce the resistance when the support bar 4 moves inside the limiting groove 5, such as Figure 6 and Figure 7 As shown, the bottom of the support bar 4 is machined with a storage groove B31, and multiple rollers B30 are assembled and connected to the top inner wall of the storage groove B31. By making the multiple rollers B30 roll and connect to the bottom inner wall of the limiting groove 5, the friction between the bottom surface of the support bar 4 and the bottom inner wall of the limiting groove 5 can be reduced, thereby ensuring that the support bar 4 moves smoothly inside the limiting groove 5.

[0042] Furthermore, a hydraulic cylinder D27 is connected between the fixed base plate 6 and the mounting top plate 3 by a universal joint. By assembling the universal joint connected to one end of the hydraulic cylinder D27 to the inner wall of one end of the receiving slot B26, and assembling the universal joint connected to the other end of the hydraulic cylinder D27 to the bottom surface of the mounting top plate 3, when the hydraulic cylinder D27 is in working state, the mounting top plate 3 can be controlled to rotate around its hinge point with the support bar 4, so as to control the alignment of the engine 1 on the top of the mounting top plate 3 with the cold flow test device 2, and avoid the axis inside the engine 1 and the axis inside the cold flow test device 2 intersecting in the vertical projection plane.

[0043] like Figure 1 , Figure 3 and Figure 5 As shown, a hydraulic cylinder B22 is provided between the top of the connecting rod 18 and the top of the mounting plate 3, and two guide columns 28 are machined on the top of each of the four fixed bases 19.

[0044] In this process, by fastening one end of the hydraulic cylinder B22 to the center of the bottom of the connecting rod 18 with the fastener 29 and assembling and fixing it with the connecting rod 18 with bolts, the other end of the hydraulic cylinder B22 can be assembled and connected to the top of the assembly top plate 3 to ensure the stability of the hydraulic cylinder B22 during operation. During the process of the hydraulic cylinder B22 controlling the connecting rod 18 to move up and down, it can drive the two movable bases 20 to slide outside the guide column 28 on the top of the corresponding fixed base 19. By using the guide column 28 to control the path of the movable bases 20 to move up and down, it can be ensured that the hydraulic cylinder B22 pushes the two movable bases 20 to the top through the connecting rod 18, and finally drives the engine 1 to move up and down, so as to control the height difference between the axis of the connecting plate 9 pre-installed inside one end of the engine 1 and the axis of the test gear 10 on the cold flow test device 2, and ensure the alignment effect.

[0045] Secondly, in order to ensure that the engine 1 is stably mounted on top of the four movable bases 20, such as Figure 3 As shown, the top of each of the four movable bases 20 is fitted with a contouring seat B21, and the top of the two contouring seats B21 near the docking base plate 8 is fitted with a contouring seat A17. By contouring the contouring seats B21 and A17 and adapting them to the bolt mounting positions on the engine 1, when the engine 1 is removed from the working position, the bolts used for fixing can be directly screwed onto the contouring seats B21 or A17, which is convenient for use.

[0046] like Figure 3 As shown, a hydraulic cylinder A14 is provided between the docking base plate 8 and the fixed base plate 6. A receiving groove A15 is machined inside one end of the docking base plate 8. A vertical plate 13 is integrally formed on the top of one end of the docking base plate 8. An angle plate 16 is assembled and connected to one end of the hydraulic cylinder A14.

[0047] In this process, by bolting one end of the hydraulic cylinder A14 to the inner wall of one end of the receiving slot A15 and the surface of one side of the vertical plate 13 (the surface of one end of the receiving slot A15 and the surface of one side of the vertical plate 13 are flush), and by bolting the corner plate 16 to the top corner of one end of the fixed base plate 6, the distance between the docking base plate 8 and the fixed base plate 6 can be controlled by the hydraulic cylinder A14, thereby achieving the coaxial alignment of the cold flow test device 2 and the engine 1 on the top of the docking base plate 8.

[0048] Secondly, in order to improve the stability of the movement of the docking base plate 8 relative to the fixed base plate 6, such as... Figure 3 and Figure 4As shown, the docking base plate 8 has multiple guide columns 7 machined at one end of the test gear 10. By symmetrically arranging the multiple guide columns 7 on both sides of the hydraulic cylinder A14, when the docking base plate 8 drives the multiple guide columns 7 to slide and connect inside the fixed base plate 6, the stability of the docking base plate 8 close to or far from the fixed base plate 6 can be controlled.

[0049] Furthermore, in order to reduce the resistance to the movement of the docking base plate 8 relative to the fixed base plate 6, such as... Figure 4 As shown, both sides of the bottom of the docking base plate 8 are machined with storage grooves A23. Multiple rollers A24 are assembled and connected to the top inner wall of the two storage grooves A23. By making the bottom plane of the multiple rollers A24 the same as the bottom plane of the fixed base plate 6, the distance between the docking base plate 8 and the fixed base plate 6 is controlled by the hydraulic cylinder A14. Thus, when the cold flow test device 2 and the engine 1 on the top of the docking base plate 8 are coaxially aligned, they can roll based on the rollers A24, reducing the resistance of the docking base plate 8 when it is close to or away from the fixed base plate 6.

[0050] Specifically, when using the coaxial alignment device of the engine and the reverse torque detection system to align the engine 1 and the cold flow test device 2:

[0051] First, assemble the contour base B21 and contour base A17 adapted to the engine 1 on the top of the movable base 20, place the engine 1 on the top of the four movable bases 20, connect the bolts originally used for mounting and fixing the engine 1 to the inside of the contour base A17 or contour base B21, and pre-install the connecting plate 9 at one end of the engine 1 (the connecting plate 9 is assembled and fixed to the engine 1 through the positioning seat 11 and the buckle 12).

[0052] Then, start the hydraulic cylinder B22, so that the hydraulic cylinder B22 pushes the connecting rod 18 to the top using the buckle 29, thereby driving the movable bases 20 at both ends of the connecting rod 18 to the top (using the two guide columns 28 at the top of the fixed base 19 for limiting support) until the axis of the connecting plate 9 assembled on the engine 1 and the axis of the test gear 10 on the cold flow test device 2 are in the same horizontal plane.

[0053] At the same time, the hydraulic cylinder D27 controls the assembly top plate 3 to rotate around its hinge point with the support bar 4, so that the assembly top plate 3 corrects the axis of the engine 1 to the horizontal plane, so as to avoid the axis inside the engine 1 from intersecting with the axis inside the cold flow test device 2 in the vertical projection plane.

[0054] In addition, the hydraulic cylinder C25 controls the support bar 4 to slide inside the limiting groove 5 (supported by multiple rollers B30 at the top inner wall of the receiving groove B31 assembled on the support bar 4), so that the mounting top plate 3 hinged to the top of the support bar 4 drives the axis of the engine 1 to be corrected to the vertical plane, so as to avoid the internal axis of the engine 1 from intersecting with the internal axis of the cold flow test device 2 in the vertical projection plane.

[0055] Next, based on the fact that the axis of the connecting plate 9 on the engine 1 and the axis of the test gear 10 on the cold flow test device 2 are in the same horizontal plane (engine 1 rises and falls), the axis of the engine 1 is corrected to the horizontal plane (the tail of the engine 1 swings up and down) and the axis of the engine 1 is corrected to the vertical plane (the tail of the engine 1 swings left and right), so that the axis of the connecting plate 9 on the engine 1 is aligned with the axis of the test gear 10 on the cold flow test device 2, ensuring stable docking when the test gear 10 on the cold flow test device 2 approaches the connecting plate 9;

[0056] Finally, the hydraulic cylinder A14, which is assembled between the fixed base plate 6 and the docking base plate 8, controls the docking base plate 8 to move towards one side of the fixed base plate 6. On the one hand, multiple guide columns 7 machined to one end of the docking base plate 8 slide inside the fixed base plate 6 to ensure the stability of the docking base plate 8's movement towards the fixed base plate 6. On the other hand, the storage groove A23, which is assembled to the inner wall of the storage groove A23 on the top of the docking base plate 8, assists the movement of the docking base plate 8, so that the test gear 10 and the connecting plate 9 pre-installed on the engine 1 can be accurately docked, which is conducive to control.

[0057] It is worth noting that multiple guide columns 7 machined to one end of the docking base plate 8 slide inside the fixed base plate 6, which is intended to control the relative movement of the docking base plate 8 and the fixed base plate 6, and ensure that the axis of the engine 1 in the aligned state and the axis of the test gear 10 on the cold flow test device 2 are in the same vertical plane.

[0058] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention 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. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A coaxial alignment device for an engine and a reverse torque detection system, characterized in that, include: The bottom plate (8) is assembled with a cold flow test device (2) on its top. Fixed base plate (6); as well as Assemble the top plate (3), which is positioned on top of the mating bottom plate (8); Fixed bases (19) are assembled and connected at the four corners of the top of the assembly top plate (3). Movable bases (20) are provided on the top of each of the four fixed bases (19). Engines (1) are provided on the top of each of the four movable bases (20). The four movable bases (20) are combined in pairs, and a connecting rod (18) is integrally formed between the tops of the two movable bases (20). A limiting groove (5) is machined on the top of one end of the fixed base plate (6), and a support strip (4) is slidably connected inside the limiting groove (5). Hydraulic cylinder C (25) is provided between the support bar (4) and the fixed base plate (6), hydraulic cylinder D (27) is connected between the fixed base plate (6) and the assembly top plate (3) by a universal joint, hydraulic cylinder B (22) is provided between the connecting rod (18) and the top of the assembly top plate (3), and hydraulic cylinder A (14) is provided between the docking base plate (8) and the fixed base plate (6). The engine (1) has a connecting plate (9) inside one end. The connecting plate (9) is cross-shaped. The four corners of the connecting plate (9) are equipped with positioning seats (11). A buckle (12) is machined in the middle of one side of the connecting plate (9). The cold flow test device (2) has a test gear (10) internally assembled at one end. Among them, the buckle plate (12) and the four positioning seats (11) are pre-assembled into the interior of one end of the engine (1). When the cold flow test device (2) on the top of the docking base plate (8) is controlled by the hydraulic cylinder A (14) to drive the test gear (10) to dock with the connecting plate (9), the cold flow test device (2) drives the test gear (10), the positioning seats (11) on the connecting plate (9) and the buckle plate (12) to rotate. The bottom plate (8) has a storage slot A (15) machined inside one end, and a vertical plate (13) is integrally formed on the top of one end of the bottom plate (8). An angle plate (16) is assembled and connected to one end of the hydraulic cylinder A (14). The other end of the hydraulic cylinder A (14) is bolted to the inner wall of one end of the receiving slot A (15) and the surface of one side of the upright plate (13), and the corner plate (16) is bolted to the top corner of one end of the fixed base plate (6). The docking base plate (8) is machined with multiple guide columns (7) at one end of the test gear (10). The multiple guide columns (7) are symmetrically arranged on both sides of the hydraulic cylinder A (14). The docking base plate (8) drives the multiple guide columns (7) to slide and connect to the inside of the fixed base plate (6). The bottom of both sides of the docking base plate (8) is machined with a storage groove A (23). Multiple rollers A (24) are assembled and connected to the top inner wall of the two storage grooves A (23). The plane where the bottom of the multiple rollers A (24) is located is the same as the plane where the bottom of the fixed base plate (6) is located.

2. The coaxial alignment device for an engine and a reverse torque detection system as described in claim 1, characterized in that: Each of the four fixed bases (19) has two guide columns (28) machined on its top. One end of the hydraulic cylinder B (22) is fastened to the center of the bottom of the connecting rod (18) by a fastener (29) and is assembled and fixed with the connecting rod (18). The other end of the hydraulic cylinder B (22) is assembled and connected to the top of the mounting plate (3). The connecting rod (18) is controlled to drive the two movable bases (20) to slide outside the guide columns (28) on the top of the corresponding fixed bases (19).

3. The coaxial alignment device for an engine and a reverse torque detection system as described in claim 1, characterized in that: The fixed base plate (6) has a storage slot B (26) inside. The storage slot B (26) is T-shaped. A universal joint connected to one end of the hydraulic cylinder D (27) is assembled to the inner wall of one end of the storage slot B (26), and a universal joint connected to the other end of the hydraulic cylinder D (27) is assembled to the bottom surface of the mounting top plate (3).

4. The coaxial alignment device for an engine and a reverse torque detection system as described in claim 1, characterized in that: The support bar (4) is arc-shaped, and the center of the support bar (4) is located at the connection point of the connecting plate (9) and the test gear (10). One end of the hydraulic cylinder C (25) is hinged to the side of one end of the support bar (4), and the other end of the hydraulic cylinder C (25) is hinged to the inner wall of one side of the receiving slot B (26).

5. The coaxial alignment device for an engine and a reverse torque detection system as described in claim 1, characterized in that: The bottom of the support bar (4) is machined with a storage groove B (31), and multiple rollers B (30) are assembled and connected to the top inner wall of the storage groove B (31). The multiple rollers B (30) are rolled and connected to the bottom inner wall of the limiting groove (5).

6. The coaxial alignment device for an engine and a reverse torque detection system as described in claim 1, characterized in that: The top of each of the four movable bases (20) is fitted with a contour seat B (21), and the top of the two contour seats B (21) near the docking base plate (8) is fitted with a contour seat A (17). The contour seats B (21) and contour seats A (17) are contoured and adapted to the bolt mounting and fixing position on the engine (1).

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