Tightening device and method for the front journal bearing compression nut of an engine compressor rotor

Abstract

The present application specifically relates to a tightening device and method for the front journal bearing tightening nut of an engine compressor rotor. Among them, the device includes: an anti-twist cylinder, with multiple strip-shaped holes on the side wall at one end; each strip-shaped hole is distributed circumferentially along the anti-twist cylinder; multiple claws, each claw is correspondingly hinged in a strip-shaped hole; a push rod, arranged in the anti-twist cylinder, with a strip-shaped groove on the side wall and having push heads at both ends; the two push heads are respectively located at both ends of each claw; a limit pin, connected to the anti-twist cylinder, and the top end extends into the strip-shaped groove; a connecting rod, one end extends into the anti-twist cylinder, and this end is threadedly connected with the push rod. When rotating, it can drive the push rod to move axially along the anti-twist cylinder, so that the push heads at both ends of the push rod can contact the corresponding ends of each claw, so that each claw can extend out of or retract into the corresponding strip-shaped hole; a nut tightening sleeve, sleeved on the outer circumference of the anti-twist cylinder from the other end of the connecting rod.

Description

Technical Field

[0001] This application belongs to the field of tightening design of the front journal bearing compression nut of an aero-engine compressor rotor, and particularly relates to a device and method for tightening the front journal bearing compression nut of an engine compressor rotor. Background Technique

[0002] In an aero-engine, the compressor is supported on the outer load-bearing casing by bearings provided on the front journal of its rotor. The bearings at this location are fixed by compression nuts screwed onto the front journal. When tightening the compression nut, since the inner diameter of the rear end of the front journal is larger than that of the front end, currently, the tightening device mostly extends forward from the rear of the compressor, and the claw is clamped on the clamping groove inside the front journal to tighten the nut. This technical solution has the following defects:

[0003] The stroke of extending the tightening device forward from the rear of the compressor is relatively long, which is likely to damage the compressor components. Moreover, the turbine is connected to the rear of the compressor, and there is also a possibility of damaging the turbine components. And it is difficult to implement when the rear end of the turbine is blocked by a plug.

[0004] In view of the existence of the above technical defects, this application is proposed.

[0005] It should be noted that the disclosure of the above background technical content is only used to assist in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of this patent application. Without clear evidence indicating that the above content was publicly available on the filing date of this application, the above background technology should not be used to evaluate the novelty and creativity of this application. Summary of the Invention

[0006] The purpose of this application is to provide a device and method for tightening the front journal bearing compression nut of an aero-engine compressor rotor to overcome or mitigate at least one aspect of the known technical defects.

[0007] The technical solution of this application is as follows:

[0008] On the one hand, a device for tightening the front journal bearing compression nut of an engine compressor rotor is provided, including:

[0009] A reaction torque tube, one end side wall of which has a plurality of strip-shaped holes; each strip-shaped hole is circumferentially distributed along the reaction torque tube;

[0010] A plurality of claws, each claw is correspondingly hinged in a strip-shaped hole;

[0011] A push rod, which is arranged in the reaction torque tube, has a strip-shaped groove on its side wall, and has push heads at both ends; the two push heads are respectively located at both ends of each claw;

[0012] A limit pin, which is connected to the reaction torque tube, and the top end extends into the strip-shaped groove;

[0013] The connecting rod has one end extending into the anti-twist cylinder. This end is threadedly connected to the ejector rod. When it rotates, it can drive the ejector rod to move axially along the anti-twist cylinder, so that the ejector heads at both ends of the ejector rod can contact the corresponding ends of each claw, thereby enabling each claw to extend or retract from the corresponding strip-shaped hole.

[0014] The nut tightening sleeve is sleeved on the outer periphery of the anti-twist cylinder from the other end of the connecting rod.

[0015] According to at least one embodiment of the present application, in the above-mentioned engine compressor rotor front journal bearing compression nut tightening device, the end of the ejector head facing away from the connecting rod has a protruding part extending outwards, and a strip-shaped groove is provided on this protruding part.

[0016] According to at least one embodiment of the present application, in the above-mentioned engine compressor rotor front journal bearing compression nut tightening device, two guide sleeves are sleeved on the anti-twist cylinder and are positioned by a stop between them, and are located at both ends of each strip-shaped hole.

[0017] According to at least one embodiment of the present application, in the above-mentioned engine compressor rotor front journal bearing compression nut tightening device, it further includes:

[0018] The pushing nut is screwed on the anti-twist cylinder and is located between each strip-shaped hole and the nut tightening sleeve.

[0019] According to at least one embodiment of the present application, in the above-mentioned engine compressor rotor front journal bearing compression nut tightening device, it further includes:

[0020] The annular spacer is sleeved on the anti-twist cylinder and is located between each strip-shaped hole and the pushing nut.

[0021] According to at least one embodiment of the present application, in the above-mentioned engine compressor rotor front journal bearing compression nut tightening device, it further includes:

[0022] The positioning seat is sleeved on the connecting rod and is connected to the end of the anti-twist cylinder away from each strip-shaped hole;

[0023] The positioning sleeve is sleeved on the connecting rod and is located between the connecting rod and the positioning seat, and is in stop fit with the connecting rod and the positioning seat;

[0024] The positioning ring is sleeved on the connecting rod and is located at the stop part between the connecting rod and the positioning sleeve.

[0025] According to at least one embodiment of the present application, in the above-mentioned engine compressor rotor front journal bearing compression nut tightening device, it further includes:

[0026] The wrench head is connected to the end of the connecting rod facing away from the ejector rod by an elastic pin.

[0027] According to at least one embodiment of the present application, in the above-mentioned tightening device for the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0028] The reverse-twist casing connecting plate is sleeved on the reverse-twist cylinder and has a torque input hole thereon;

[0029] The torque amplifier is sleeved on the reverse-twist cylinder, the torque output end is connected to the nut tightening sleeve, and the torque input end is snapped into the torque input hole.

[0030] According to at least one embodiment of the present application, in the above-mentioned tightening device for the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0031] The backing plate is sleeved on the reverse-twist cylinder and is placed between the reverse-twist casing connecting plate and the torque amplifier.

[0032] According to at least one embodiment of the present application, in the above-mentioned tightening device for the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0033] The tensioning nut is screwed on the end of the reverse-twist cylinder away from the strip hole and presses against the outside of the reverse-twist casing connecting plate.

[0034] On the other hand, a method for tightening the front journal bearing compression nut of the engine compressor rotor is provided, including:

[0035] Assemble the claw, ejector rod, limit pin, connecting rod, guide sleeve, push nut, annular cushion block, positioning seat, positioning sleeve, positioning ring, and wrench head on the reverse-twist cylinder;

[0036] Turn the wrench head to make the connecting rod rotate, push the ejector rod forward, and retract each claw into the corresponding strip hole;

[0037] Insert the end of the reverse-twist cylinder with the strip hole into the front journal from the front end;

[0038] When the annular cushion block contacts the anti-rotation elastic lock piece of the compression nut, turn the wrench head to make the connecting rod rotate, pull the ejector rod backward, and extend each claw out of the corresponding strip hole, and then rotate the reverse-twist cylinder to make each claw correspondingly catch in an anti-twist groove in the front journal;

[0039] Turn the push nut to push the annular cushion block and deform the anti-rotation elastic lock piece to release the lock on the compression nut;

[0040] Assemble the nut tightening sleeve on the reverse-twist cylinder, and then adjust the position and angle of the nut tightening sleeve to catch onto the compression nut;

[0041] Assemble the torque amplifier, backing plate, reverse-twist casing connecting plate, and tensioning nut on the reverse-twist cylinder;

[0042] Turn the tension nut to make each claw tightly hold in the corresponding reverse twist groove in the front journal;

[0043] Connect the reverse twist casing connecting plate and the front end of the load-bearing casing with bolts;

[0044] Input torque at the input end of the torque amplifier to drive the nut tightening sleeve and tighten the compression nut. Description of the Drawings

[0045] Figure 1 is a schematic diagram of the tightening device for the compression nut of the front journal bearing of the engine compressor rotor provided by the embodiment of the present application;

[0046] Figure 2 is a partial schematic diagram of the tightening device for the compression nut of the front journal bearing of the engine compressor rotor provided by the embodiment of the present application;

[0047] Figure 3 is a working schematic diagram of the tightening device for the compression nut of the front journal bearing of the engine compressor rotor provided by the embodiment of the present application;

[0048] Wherein:

[0049] 1 - reverse twist cylinder; 2 - claw; 3 - ejector rod; 4 - limit pin; 5 - connecting rod; 6 - nut tightening sleeve; 7 - guide sleeve; 8 - push nut; 9 - annular cushion block; 10 - positioning seat; 11 - positioning sleeve; 12 - positioning ring; 13 - wrench head; 14 - reverse twist casing connecting plate; 15 - torque amplifier; 16 - backing plate; 17 - tension nut; 18 - front journal; 19 - compression nut; 20 - load-bearing casing.

[0050] For better illustration of this embodiment, some components in the drawings are omitted, enlarged or reduced, which do not represent the dimensions of the actual product. In addition, the drawings are only for illustrative purposes and should not be construed as a limitation of this patent. Detailed Embodiments

[0051] To make the technical solutions of the present application and their advantages clearer, the technical solutions of the present application will be further described clearly and completely in detail below with reference to the drawings. It can be understood that the specific embodiments described herein are only part of the embodiments of the present application, which are only used to explain the present application and are not a limitation of the present application. It should be noted that for the convenience of description, only the parts related to the present application are shown in the drawings, and other related parts can refer to the usual design. Without conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0052] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the ordinary meanings understood by those of ordinary skill in the art to which this application pertains. The words indicating directions such as "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", etc. used in the description of this application are only used to indicate relative directions or positional relationships, rather than implying that the device or component must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the object being described changes, its relative positional relationship may also change accordingly. Therefore, it should not be construed as a limitation to this application. The terms "first", "second", "third", and similar terms used in the description of this application are only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The similar words such as "a", "one", or "the" used in the description of this application should not be construed as an absolute limitation on the quantity, but should be understood as meaning at least one. The similar words such as "including" or "comprising" used in the description of this application are intended to indicate that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects.

[0053] In addition, it should be noted that, unless otherwise clearly specified and limited, the similar words such as "installed", "connected", and "joined" used in the description of this application should be understood in a broad sense. For example, the 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 directly connected or indirectly connected through an intermediate medium, and can also be the communication inside two components. Those skilled in the art can understand its specific meaning in this application according to the specific situation.

[0054] The following further elaborates on this application in conjunction with the attached Figures 1 to 3 for a more detailed description.

[0055] On the one hand, a tightening device for the front journal bearing compression nut of an engine compressor rotor is provided, including:

[0056] A reaction torsion cylinder 1, with a plurality of strip-shaped holes extending along its axial direction on one end sidewall; each strip-shaped hole is circumferentially distributed along the reaction torsion cylinder 1;

[0057] A plurality of claws 2, each claw 2 is correspondingly hinged in a strip-shaped hole with a pin in the middle, and the number thereof can specifically be four;

[0058] A push rod 3, axially arranged in the reaction torsion cylinder 1, with a strip-shaped groove extending along its axial direction on the sidewall, and having head parts at both ends; the two head parts are respectively located at both ends of each claw 2;

[0059] The limit pin 4 is connected to the reverse torsion cylinder 1, and its top end extends into the strip-shaped groove to prevent the ejector rod 3 from rotating relative to the reverse torsion cylinder 1, but does not restrict the axial movement of the ejector rod 3 along the reverse torsion cylinder 1;

[0060] The connecting rod 5 has one end extending into the reverse torsion cylinder 1, and this end is connected to the ejector rod 3 by a threaded fit. When rotated, it can drive the ejector rod 3 to move axially along the reverse torsion cylinder 1, so that the ejector heads at both ends of the ejector rod 3 can contact the corresponding ends of each claw 2, thereby enabling each claw 2 to extend or retract from the corresponding strip-shaped hole. The inner sides at both ends of each claw 2 can be designed as inclined surfaces, and the parts of the two ejector heads used to contact each claw 2 can be designed as arc surfaces;

[0061] The nut tightening sleeve 6 is sleeved on the outer periphery of the reverse torsion cylinder 1 from the other end of the connecting rod 5.

[0062] Using the device for tightening the compression nut of the front journal bearing of the engine compressor rotor disclosed in the above embodiment to tighten the compression nut of the front journal bearing of the aero-engine compressor rotor, the following steps can be referred to:

[0063] Assemble the claw 2, ejector rod 3, limit pin 4, and connecting rod 5 on the reverse torsion cylinder 1;

[0064] Turn the connecting rod 5 to push the ejector rod 3 forward, so that each claw 2 retracts into the corresponding strip-shaped hole;

[0065] Insert the end of the reverse torsion cylinder 1 with the strip-shaped hole into the front journal 18 from the front end;

[0066] Turn the connecting rod 5 to pull the ejector rod 3 backward, so that each claw 2 extends from the corresponding strip-shaped hole, and then rotate the reverse torsion cylinder 1 to make each claw 2 correspondingly catch in a reverse torsion groove in the front journal 18;

[0067] Assemble the nut tightening sleeve 6 on the reverse torsion cylinder 1, and then adjust the position and angle of the nut tightening sleeve 6 to catch it on the compression nut 19;

[0068] Turn the nut tightening sleeve 6 to tighten the compression nut 19. During this process, prevent the front journal 18 from rotating by fixing the reverse torsion cylinder 1.

[0069] For the tightening device of the front journal bearing compression nut of the engine compressor rotor disclosed in the above embodiments, those skilled in the art can understand that its design is to push the ejector rod 3 to move axially along the reverse torsion cylinder 1 by turning the connecting rod 5, so as to realize the extension or retraction of each claw 2 from the corresponding strip hole on the reverse torsion cylinder 1. When retracting, the front end of the reverse torsion cylinder 1 can be inserted into the front journal 18. After being inserted into the front journal 18, each claw 2 is extended and clamped into the reverse torsion groove in the front journal 18, so as to fix the front journal 18. Then, the nut tightening sleeve 6 is sleeved on the reverse torsion cylinder 1, the position and angle are adjusted, and it is clamped on the compression nut 19, so that the compression nut 19 can be tightened conveniently and quickly, without causing knocking damage to the internal components of the compressor and turbine, and it is easy to implement.

[0070] In some alternative embodiments, in the above tightening device of the front journal bearing compression nut of the engine compressor rotor, the end of the ejector head facing away from the connecting rod 5 has a protruding part extending outwards, and the protruding part can be annular and has a strip groove thereon.

[0071] In some alternative embodiments, in the above tightening device of the front journal bearing compression nut of the engine compressor rotor, two guide sleeves 7 are sleeved on the reverse torsion cylinder 1 with pins, positioned by a rabbet with the reverse torsion cylinder 1, located at both ends of each strip hole, and kept horizontal with the protruding part on the outer wall of the reverse torsion cylinder 1, and can play a positioning and guiding role during the process of the reverse torsion cylinder 1 being inserted into the front journal 18.

[0072] In some alternative embodiments, in the above tightening device of the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0073] A pushing nut 8 is screwed on the reverse torsion cylinder 1 and is located between each strip hole and the nut tightening sleeve 6.

[0074] For the tightening device of the front journal bearing compression nut of the engine compressor rotor disclosed in the above embodiments, those skilled in the art can understand that in an aeroengine, the front journal bearing compression nut of the compressor rotor is usually locked by an anti-rotation elastic lock piece. The design is that the pushing nut 8 is screwed on the reverse torsion cylinder 1. When the compression nut 19 is turned, the anti-rotation elastic lock piece can be deformed by turning to release the lock on the compression nut 19. After the compression nut 19 is tightened, the anti-rotation elastic lock piece can be released, and the shape of the anti-rotation elastic lock piece is restored, and the compression nut 19 can be locked again. For details, reference can be made to the method for tightening the front journal bearing compression nut of the engine compressor rotor disclosed in this application.

[0075] In some alternative embodiments, in the above tightening device of the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0076] The annular spacer 9 is sleeved on the reverse torsion cylinder 1, located between each strip hole and the push nut 8, and specifically located between the push nut 8 and the anti-rotation elastic lock piece during specific application, which can reduce the friction force between the push nut 8 and the anti-rotation elastic lock piece.

[0077] In some alternative embodiments, in the above-mentioned tightening device for the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0078] The positioning seat 10 is sleeved on the connecting rod 5 and is connected to one end of the reverse torsion cylinder 1 away from each strip hole by a pin;

[0079] The positioning sleeve 11 is sleeved on the connecting rod 5, located between the connecting rod 5 and the positioning seat 10, and is in interference fit with the connecting rod 5 and the positioning seat 10;

[0080] The positioning ring 12 is sleeved on the connecting rod 5 and is located at the interference part between the connecting rod 5 and the positioning sleeve 11.

[0081] For the tightening device for the front journal bearing compression nut of the engine compressor rotor disclosed in the above embodiments, those skilled in the art can understand that its designed positioning seat 10, positioning sleeve 11, and positioning ring 12 are between the connecting rod 5 and the reverse torsion cylinder 1, which can axially position the connecting rod 5 in the reverse torsion cylinder 1 and can reduce the friction force between the connecting rod 5 and the reverse torsion cylinder 1 when the connecting rod 5 rotates.

[0082] In some alternative embodiments, in the above-mentioned tightening device for the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0083] The wrench head 13 is connected to one end of the connecting rod 5 facing away from the ejector rod 3 by an elastic pin, and the connecting rod 5 can be driven to rotate by screwing the wrench head 13.

[0084] In some alternative embodiments, in the above-mentioned tightening device for the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0085] The reverse torsion casing connecting plate 14 is sleeved on the reverse torsion cylinder 1, specifically can be connected by thread or card slot, and has a torque input hole thereon;

[0086] The torque amplifier 15 is sleeved on the reverse torsion cylinder 1, the torque output end is connected to the nut tightening sleeve 6, and the torque input end is clamped into the torque input hole.

[0087] For the tightening device for the front journal bearing compression nut of the engine compressor rotor disclosed in the above embodiments, those skilled in the art can understand that by inputting torque to the input end of the torque amplifier 15, the nut tightening sleeve 6 can be driven to rotate to realize the tightening of the compression nut 19, and at the same time, the reverse torsion casing connecting plate 14 is bolted to the front end of the load-bearing casing 20, thereby circumferentially fixing the reverse torsion cylinder 1 to prevent the reverse torsion cylinder 1 and its front journal 18 from rotating.

[0088] For the tightening device of the front journal bearing compression nut of the engine compressor rotor disclosed in the above embodiments, those skilled in the art can understand that the anti-torsion casing connecting plate 14 and the front end of the load-bearing casing 20 are connected by bolts. A connecting edge can be provided at the edge of the anti-torsion casing connecting plate 14 and connected by using the existing bolt holes at the front end of the load-bearing casing 20, without the need to open additional bolt holes on the load-bearing casing 20.

[0089] In some alternative embodiments, in the above-mentioned tightening device of the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0090] A backing plate 16, sleeved on the anti-torsion cylinder 1, can be specifically connected by threads or a card slot, which can be a square hole card slot, and is placed between the anti-torsion casing connecting plate 14 and the torque amplifier 15, and is fixed to the torque amplifier 15 by two anti-rotation pins to realize the transmission of the reaction force between the anti-torsion cylinder 1 and the anti-torsion casing connecting plate 14.

[0091] In some alternative embodiments, in the above-mentioned tightening device of the front journal bearing compression nut of the engine compressor rotor, it further includes:

[0092] A tensioning nut 17, screwed on the end of the anti-torsion cylinder 1 away from the strip hole, is pressed against the outside of the anti-torsion casing connecting plate 14. When tightening the compression nut 19, the anti-torsion cylinder 1 can be tightened to prevent the anti-torsion cylinder 1 from moving axially.

[0093] On the other hand, a method for tightening the front journal bearing compression nut of an engine compressor rotor is provided, including:

[0094] Assemble the claw 2, the ejector rod 3, the limit pin 4, the connecting rod 5, the guide sleeve 7, the push nut 8, the annular cushion block 9, the positioning seat 10, the positioning sleeve 11, the positioning ring 12, and the wrench head 13 on the anti-torsion cylinder 1;

[0095] Turn the wrench head 13 to make the connecting rod 5 rotate, push the ejector rod 3 forward, and retract each claw 2 into the corresponding strip hole;

[0096] Insert the end of the anti-torsion cylinder 1 with the strip hole into the front journal 18 from the front end;

[0097] When the annular cushion block 9 contacts the anti-rotation elastic lock piece of the compression nut 19, turn the wrench head 13 to make the connecting rod 5 rotate, pull the ejector rod 3 backward, and extend each claw 2 out of the corresponding strip hole, and then rotate the anti-torsion cylinder 1 to make each claw 2 correspondingly catch into an anti-torsion groove in the front journal 18;

[0098] Turn the push nut 8 to push the annular cushion block 9 to deform the anti-rotation elastic lock piece to release the lock on the compression nut 19;

[0099] Assemble the nut tightening sleeve 6 on the reverse torsion barrel 1, and then adjust the position and angle of the nut tightening sleeve 6 to clamp it onto the compression nut 19;

[0100] Assemble the torque amplifier 15, the backing plate 16, the reverse torsion casing connecting plate 14, and the tension nut 17 on the reverse torsion barrel 1;

[0101] Turn the tension nut 17 to make each claw 2 tightly clamp in the corresponding reverse torsion groove in the front journal 18;

[0102] Connect the reverse torsion casing connecting plate 14 to the front end of the load-bearing casing 20 with bolts;

[0103] Input torque at the input end of the torque amplifier 15 to drive the nut tightening sleeve 6 to tighten the compression nut 19.

[0104] Regarding the method for tightening the compression nut of the front journal bearing of the engine compressor rotor disclosed in the above embodiments, those skilled in the art can understand that it is implemented based on the device for tightening the compression nut of the front journal bearing of the engine compressor rotor disclosed in the above embodiments. The description is relatively simple. For specific relevant parts, reference can be made to the relevant descriptions in the part of the device for tightening the compression nut of the front journal bearing of the aeroengine compressor rotor. Its technical effects can also be referred to the technical effects of the relevant parts of the device for tightening the compression nut of the front journal bearing of the aeroengine compressor rotor, which will not be elaborated here.

[0105] The various embodiments in the specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0106] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings. Those skilled in the art should understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A tightening device for the front journal bearing compression nut of an engine compressor rotor, characterized in that Comprising: A reverse-twist cylinder (1), with multiple strip-shaped holes on the side wall at one end; each strip-shaped hole is circumferentially distributed along the reverse-twist cylinder (1); Multiple pawls (2), each pawl (2) being correspondingly hinged in a strip-shaped hole; A push rod (3), arranged in the reverse-twist cylinder (1), with a strip-shaped groove on the side wall and having end heads at both ends; the two end heads are respectively located at both ends of each pawl (2); A limit pin (4), connected to the reverse-twist cylinder (1), with its top end extending into the strip-shaped groove; A connecting rod (5), with one end extending into the reverse-twist cylinder (1), and this end is threadedly connected to the push rod (3). When rotated, it can drive the push rod (3) to move axially along the reverse-twist cylinder (1), so that the end heads at both ends of the push rod (3) can contact the corresponding ends of each pawl (2), thereby enabling each pawl (2) to extend or retract from the corresponding strip-shaped hole; A nut tightening sleeve (6), sleeved on the outer periphery of the reverse-twist cylinder (1) from the other end of the connecting rod (5); A reverse-twist housing connecting plate (14), sleeved on the reverse-twist cylinder (1), and having a torque input hole thereon; A torque amplifier (15), sleeved on the reverse-twist cylinder (1), with its torque output end connected to the nut tightening sleeve (6), and its torque input end snapped into the torque input hole; A backing plate (16), sleeved on the reverse-twist cylinder (1), and padded between the reverse-twist housing connecting plate (14) and the torque amplifier (15); The end of the end head of the push rod facing away from the connecting rod (5) has an outwardly extending protruding part, and there is a strip-shaped groove on this protruding part; Two guide sleeves (7), sleeved on the reverse-twist cylinder (1), positioned by a rabbet with the reverse-twist cylinder (1), and located at both ends of each strip-shaped hole.

2. The engine compressor rotor front journal bearing compression nut tightening device according to claim 1, characterized in that It further comprises: A push nut (8), screwed onto the reverse-twist cylinder (1), and located between each strip-shaped hole and the nut tightening sleeve (6).

3. The engine compressor rotor front journal bearing compression nut tightening device according to claim 1, characterized in that It further comprises: An annular spacer block (9), sleeved on the reverse-twist cylinder (1), and located between each strip-shaped hole and the push nut (8).

4. The engine compressor rotor front journal bearing compression nut tightening device according to claim 1, characterized in that It further comprises: A positioning seat (10), sleeved on the connecting rod (5), and connected to the end of the reverse-twist cylinder (1) far from each strip-shaped hole; A positioning sleeve (11), sleeved on the connecting rod (5), located between the connecting rod (5) and the positioning seat (10), and in rabbet fit with the connecting rod (5) and the positioning seat (10); A positioning ring (12), sleeved on the connecting rod (5), and located at the rabbet part between the connecting rod (5) and the positioning sleeve (11).

5. The engine compressor rotor front journal bearing compression nut tightening device according to claim 1, characterized in that It further comprises: A wrench head (13), connected to the end of the connecting rod (5) facing away from the push rod (3) by an elastic pin.

6. The engine compressor rotor front journal bearing compression nut tightening device according to claim 1, characterized in that It further comprises: The tightening nut (17) is screwed onto the end of the reverse torsion cylinder (1) away from the strip hole and presses against the outside of the reverse torsion casing connecting plate (14).

7. A method for tightening the compression nut of the front journal bearing of an engine compressor rotor, which is implemented based on the tightening device for the compression nut of the front journal bearing of the engine compressor rotor described in claim 6, characterized in that, It includes: Assembling a claw (2), a push rod (3), a limit pin (4), a connecting rod (5), a guide sleeve (7), a push nut (8), an annular cushion block (9), a positioning seat (10), a positioning sleeve (11), a positioning ring (12), and a wrench head (13) on the reverse torsion cylinder (1); Turn the wrench head (13) to rotate the connecting rod (5), push the push rod (3) forward, and retract each claw (2) into the corresponding strip hole; Insert the end of the reverse torsion cylinder (1) with the strip hole into the front journal (18) from the front end; When the annular cushion block (9) contacts the anti-rotation elastic lock piece of the compression nut (19), turn the wrench head (13) to rotate the connecting rod (5), pull the push rod (3) backward, and extend each claw (2) out of the corresponding strip hole. Then, by rotating the reverse torsion cylinder (1), each claw (2) is correspondingly clamped into an anti-torsion groove in the front journal (18); Turn the push nut (8) to push the annular cushion block (9) and deform the anti-rotation elastic lock piece to release the locking of the compression nut (19); Assemble the nut tightening sleeve (6) on the reverse torsion cylinder (1), and then adjust the position and angle of the nut tightening sleeve (6) to clamp onto the compression nut (19); Assemble a torque amplifier (15), a backing plate (16), a reverse torsion casing connecting plate (14), and a tightening nut (17) on the reverse torsion cylinder (1); Turn the tightening nut (17) to clamp each claw (2) tightly into the corresponding anti-torsion groove in the front journal (18); Connect the reverse torsion casing connecting plate (14) and the front end of the load-bearing casing (20) by bolts; Input torque at the input end of the torque amplifier (15) to drive the nut tightening sleeve (6) to tighten the compression nut (19).

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