Pull-fold device and disassembly device

Abstract

The present invention provides a folding and pulling device. The folding and pulling device includes an extension rod, a base, a folding and pulling mechanism, and a fastening mechanism. The extension rod has a control end and an operating end along the extension direction. The base is connected to the operating end of the extension rod. In the folding and pulling mechanism, a hook is movably arranged on the base along a first trajectory and is used for hooking a lug of a lock piece. A first elastic member is connected between the hook and the base. The actuating end of a first rope is connected to the hook, and the operating end of the first rope is located at the control end of the extension rod. Thus, by pulling the operating end of the first rope, the hook performs a folding and pulling operation on the lug. The fastening mechanism is used for fastening the front end side of the mounting component. The present invention also provides a dismounting device adopting the above folding and pulling device. The above folding and pulling device facilitates the folding and pulling of the lock piece mounted on the mounting component.

Description

Technical Field

[0001] The present invention relates to a folding device capable of folding a locking piece mounted on a mounting component, and also relates to a dismounting device capable of dismounting a balance spring mounted on a blade flange. Background Art

[0002] When conducting a test run of an aero-engine, it is necessary to perform in-situ balancing on the low-pressure turbine rotor. One common method is to perform a trimming process by removing balance springs of different specifications from the crown of the last-stage rotor of the low-pressure turbine, thereby reducing the engine unbalance. If the result shown by the test is still not satisfactory after the trimming process, it is necessary to disassemble or replace the balance spring that has been installed.

[0003] The structure of the balance spring is designed according to the structure of the last-stage rotor of the low-pressure turbine. During assembly, it has been firmly clamped and fitted on the rotor crown, and the separation process is extremely likely to cause damage to the rotor blades. When disassembling the balance spring, if the engine tail nozzle is not disassembled, the dismounting device needs to pass through the flow path between the outer wall of the tail nozzle and the tail cone, and also needs to pass through the rear support plate of the low-pressure turbine. The space to be passed through is narrow and complex.

[0004] Therefore, it is necessary to provide a dismounting device that is particularly suitable for disassembling the balance spring. Summary of the Invention

[0005] The object of the present invention is to provide a folding device that can facilitate the folding of a locking piece mounted on a mounting component.

[0006] Another object of the present invention is to provide a dismounting device that is suitable for disassembling a balance spring.

[0007] The present invention provides a folding device for folding a locking piece mounted on a mounting component. The locking piece has a tab disposed on the rear end side of the mounting component. The folding device includes an extension rod, a base, a folding mechanism, and a fastening mechanism. The extension rod has a control end and an operating end along the extension direction. The base is connected to the operating end of the extension rod. The folding mechanism includes a hook, a first elastic member, and a first rope. The hook is movably disposed on the base along a first trajectory for hooking the tab. The first elastic member is connected between the hook and the base. The actuating end of the first rope is connected to the hook, and the operating end of the first rope is located at the control end of the extension rod. Thus, by pulling the operating end of the first rope, the hook performs a folding operation on the tab. The fastening mechanism is used to fasten the front end side of the mounting component.

[0008] In one embodiment, the fastening mechanism includes a fastener, a second elastic member, and a second rope. The fastener is movably disposed on the base along a second trajectory. The second elastic member is connected between the fastener and the base. The actuating end of the second rope is connected to the fastener, and the operating end of the second rope is located at the control end of the extension rod. Thus, by pulling the operating end of the second rope, the fastener fastens the front end side of the mounting member.

[0009] In one embodiment, the locking piece has a sheet body, and the lug protrudes from the sheet body. The sheet body is placed on the mounting member. The fastening mechanism includes a fastener. The fastener has a pressing portion and an abutting portion. The pressing portion is used for pressing the sheet body downward, and the abutting portion protrudes downward from the pressing portion and is used for abutting against the front end side of the mounting member backward. Thus, the fastener fastens the mounting member.

[0010] In one embodiment, the folding device further includes an operating mechanism. The operating mechanism includes a first slider and a first threaded member. The first slider is slidably disposed on the extension rod and is connected to the operating end of the first rope. The first threaded member is threadedly connected to the first slider. Thus, by screwing the screwing head of the first threaded member exposed at the control end, the first rope is pulled by the first slider.

[0011] In one embodiment, the folding device further includes an operating mechanism. The operating mechanism includes a second slider and a second threaded member. The second slider is slidably disposed on the extension rod and is connected to the operating end of the second rope. The second threaded member is threadedly connected to the second slider. Thus, by screwing the screwing head of the second threaded member exposed at the control end, the second rope is pulled by the second slider.

[0012] In one embodiment, the operating mechanism further includes a first slider and a first threaded member. The first slider is slidably disposed on the extension rod and is connected to the operating end of the first rope. The first threaded member is threadedly connected to the first slider. Thus, by screwing the screwing head of the first threaded member exposed at the control end, the first rope is pulled by the first slider. The sliding directions of the first slider and the second slider are arranged intersectingly.

[0013] In one embodiment, the sliding direction of the first slider is consistent with the extending direction; and / or, the sliding direction of the second slider is perpendicular to the extending direction, and a pulley is provided at the control end of the extension rod, and the second rope bypasses the pulley and is connected to the second slider.

[0014] The present invention further provides a disassembly device for disassembling a balance snap ring installed on a blade flange. The disassembly device is the aforementioned pulling and folding device. The hook of the pulling and folding mechanism of the pulling and folding device is used to hook the pressing piece of the balance snap ring, and the fastening mechanism of the pulling and folding device is used to fasten the front end side of the blade flange.

[0015] In one embodiment, a sliding groove is provided on the base of the pulling and folding device. The sliding groove includes a first groove extending vertically and a second groove extending horizontally. The second groove converges with the upper side of the first groove at the front side. The hook slides upward first and then backward by cooperating with the sliding groove through a sliding pin. A first pulley is provided above and behind the sliding groove on the base, and a second pulley is provided below and behind the first pulley. After the first rope of the pulling and folding mechanism bypasses the first pulley from above, it then bypasses the second pulley from below, and then extends along the extension rod of the pulling and folding device.

[0016] In one embodiment, the second pulley provides two pulley grooves for the first rope and the second rope of the fastening mechanism to wind around respectively.

[0017] In the above-mentioned pulling and folding device, the extension rod can be inserted into the position where the lock piece is located, and the installation component is fastened by the fastening mechanism to provide a support foundation. Then, the movement of the hook at the proximal end can be controlled at the distal end of the extension rod through the first rope, so as to pull and fold the tab of the lock piece. The elastic force of the first elastic member can make the hook quickly return to its original position and make the pulling operation smoother. Therefore, it is convenient to pull and fold the lock piece installed on the installation component. The whole operation is convenient, labor-saving, and has a simple structure and low cost, especially suitable for pulling and folding operations in narrow spaces.

[0018] When the above-mentioned disassembly device adopts the aforementioned pulling and folding device, the hook of the pulling and folding mechanism hooks the pressing piece of the balance snap ring, and the fastener of the fastening mechanism fastens the front end side of the blade flange, so that the operator can stand at the tail nozzle outlet to disassemble the balance snap ring, which is especially suitable for disassembling the balance snap ring installed on the blade flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above-mentioned and other features, properties, and advantages of the present invention will become more obvious through the following description with reference to the drawings and embodiments, wherein:

[0020] Figure 1 is a perspective view of an exemplary pulling and folding device.

[0021] Figure 2 is a side perspective view showing the balance snap ring installed at the rotor crown.

[0022] Figure 3 is a bottom perspective view showing the balance snap ring installed at the rotor crown.

[0023] Figure 4 is a perspective view showing the balance circlip after being pulled and folded, wherein the balance circlip is in an inverted state relative to Figure 2 in

[0024] Figure 5 is a partial cross-sectional view of an exemplary pulling and folding device, which shows the pulling and folding mechanism and the fastening mechanism of the pulling and folding device.

[0025] Figure 6 is another partial cross-sectional view of an exemplary pulling and folding device, which shows the operating mechanism of the pulling and folding device.

[0026] Figure 7 is a partial perspective view of an exemplary pulling and folding device, which shows the pulling and folding mechanism and the fastening mechanism of the pulling and folding device.

[0027] Figure 8 is a partial top view of an exemplary pulling and folding device, which shows the pulling and folding mechanism and the fastening mechanism of the pulling and folding device.

[0028] Figure 9 is a perspective view showing the exemplary pulling and folding device as a disassembling device to disassemble the balance circlip.

[0029] Figure 10 , Figure 11 , Figure 12 and Figure 13 are schematic diagrams showing the process of the disassembling device disassembling the balance circlip in sequence, wherein. Detailed Embodiments

[0030] The present invention will be further described below in conjunction with the detailed embodiments and the drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention is obviously capable of being implemented in many other ways different from this description. Those skilled in the art can make similar generalizations and deductions according to the actual application circumstances without departing from the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this detailed embodiment.

[0031] For example, when it is described in the specification that the first feature is formed above or on the second feature subsequently, it may include embodiments in which the first feature and the second feature are formed by a direct connection manner, and may also include embodiments in which additional features are formed between the first feature and the second feature, so that the first feature and the second feature may not be directly connected. Further, when the first element is described as being connected or combined with the second element, this description includes embodiments in which the first element and the second element are directly connected or combined with each other, and also includes embodiments in which one or more other intervening elements are added to indirectly connect or combine the first element and the second element.

[0032] During the test run of an aero-engine, vibration problems of the low-pressure turbine rotor often occur, which can have a significant impact on the performance and safety of the aero-engine. Usually, the imbalance of the low-pressure turbine rotor can be finely adjusted by combining the vibration results measured during the whole-engine test run, thereby reducing the vibration of the low-pressure rotor without disassembling the engine. The method of balancing the low-pressure rotor itself is to perform trimming or balancing according to the specific situation of the imbalance of the low-pressure rotor, thereby reducing the engine imbalance. For example, balance screws of different specifications can be selectively assembled at the fan end.

[0033] As described in the background art, the trimming process can also be carried out by removing balance clips of different specifications on the blade crown of the last stage of the low-pressure turbine. If the test results still do not meet the requirements after the trimming process, it is necessary to remove or replace the balance clips that have been installed on the blade crown of the last stage of the low-pressure turbine.

[0034] The inventor analyzed and believed that when removing the balance clip, after pulling and folding the pressing piece that is firmly attached to the blade flange through deformation of the balance clip, subsequent operations can be facilitated. After the pressing piece is deformed, the force application area for the pressing piece used for disassembly is narrow, making it difficult to remove. The long and complex space that needs to be passed through also makes it difficult for ordinary tools to reach. All these make it very difficult to directly separate the balance clip and the blade crown of the last stage of the low-pressure turbine manually using simple tools.

[0035] Figure 1 Fig. shows the overall exemplary structure of the pulling and folding device 10. The pulling and folding device 10 can pull and fold a locking piece installed on a mounting member. The locking piece can have a lug placed on the rear end side of the aforementioned mounting member. In the text, the pulling and folding device 10 will be described as an example of the disassembly device in conjunction with the drawings. This disassembly device is used to disassemble the balance clip 20 installed on the blade flange 30 ( Figure 2 shown in Fig.). That is, this disassembly device is the pulling and folding device 10, and the blade flange 30 is used as an example of the aforementioned mounting member, and the balance clip 20 is used as an example of the aforementioned locking piece.

[0036] Figures 2 to 4 Fig. shows the related structure of the balance clip 10. Figure 2 and Figure 3 Figs. show the installation state of the balance clip 10 installed on the blade flange 30. The balance clip 20 has a pressing piece 201 placed on the rear end side of the blade flange 30. The pressing piece 201 is used as an example of the lug of the locking piece. The balance clip 20 also has a clip piece 200. The pressing piece 201 protrudes from the clip piece 200. The clip piece 200 of the balance clip 20 is placed on the blade flange 30. The balance clip 20 also has a hook 202. The hook 202 protrudes from the side of the clip piece 200 opposite to the pressing piece 201 and hooks the front end side of the blade flange 30. Figure 4Shows the disassembled state of the balance circlip 20 after being disassembled by the disassembling device or folded by the folding device 10. Among them, compared with Figure 2 and Figure 3 In the installed state shown in, the pressing piece 201 of the balance circlip 20 is opened relative to the circlip piece 200 by a certain angle, for example, about 90°.

[0037] Spatial relationship terms such as "front", "rear", "upper", "lower", etc. are used in the text to describe the relationship between an element or feature shown in the attached drawings and other elements or features, which is for convenience of description with reference to Figure 10 the direction. For example, for the folding device 10, when the folding device 10 folds or disassembles the balance circlip 20, the side closer to the balance circlip 20 is the front side, and the side farther from the balance circlip 20 is the rear side. It can be understood that this is only for convenience of description, and these spatial relationship terms are intended to include other directions of the elements or components in use or operation, in addition to the directions depicted in the attached drawings. For example, if the components in the attached drawings are flipped, the direction of the element described as "in front of" other elements or features will be changed to "behind" the other elements or features. Therefore, the spatial relationship description terms used in the text should be interpreted accordingly.

[0038] Combined with Figure 1 , Figure 5 and Figure 6 , the folding device 10 includes a folding mechanism 1, a fastening mechanism 2, an extension rod 3 and a base 4. It should be understood that the attached drawings are only examples and are not drawn according to the condition of equal proportion, and should not be used to limit the actual scope of protection required by the present invention.

[0039] The extension rod 3 has a control end 31 and an operating end 32 along the extension direction D1. The base 4 is connected to the operating end 32 of the extension rod 3, for example, fixedly connected. It should be understood that the control end 31 and the operating end 32 of the extension rod 3 are also the two ends of the extension rod 3, and the different expressions are only for facilitating the distinction of the corresponding features for convenience of description. Similar expressions in the text also include the actuating end R11 and the operating end R12 of the first rope R1, the actuating end R21 and the operating end R22 of the second rope R2, etc. that will be described below.

[0040] The fastening mechanism 2 is used to fasten the front end side of the blade flange 30 (as an example of the installation component). For example, the fastening mechanism 2 can fasten the front end 302 of the blade flange 30 through an elastic snap structure.

[0041] The folding mechanism 1 includes a hook 11, a first elastic member S1 and a first rope R1. The hook 11 moves along the first trajectory T1 ( Figure 7As shown in the figure, a pressing piece 201 (as an example of the tab of the locking piece) that can be movably arranged on the base 4 and is used to hook the balance retaining spring 20. The first elastic member S1, such as a spring, is connected between the hook 11 and the base 4. The actuating end R11 of the first rope R1 is connected to the hook 11, and the operating end R12 of the first rope R1 is located at the control end 31 of the extension rod 3. Thus, by pulling the operating end R12 of the first rope R1, the hook 11 performs a folding operation on the pressing piece 201.

[0042] In the above-mentioned folding device 10, by fastening the installation part through the fastening mechanism 2, the base 4 of the folding device 10 can use the installation part as a support base. By pulling the operating end R12 of the first rope R1 of the folding mechanism 1 at the control end 31 of the extension rod 3, the hook 11 at the operating end 32 of the extension rod 3 can move the tab along the first trajectory T1, so that the tab can be bent relative to other parts of the locking piece installed on the installation part. Moreover, after the pulling force is released, the elastic force of the first elastic member S1 can always make the hook 11 tend to return to the initial position. This not only facilitates the next use after the hook 11 returns to its position, but also makes the folding operation smoother.

[0043] The above-mentioned folding device 10 makes the folding operation convenient and labor-saving, and has a simple structure and low cost. It is especially suitable for narrow spaces. For example, the operating end 32 of the extension rod 3 can extend into the narrow space, while the control end 31 is exposed outside the narrow space. Only by pulling the operating end R12 of the first rope R1 outside the narrow space, the folding or disassembly operation inside the narrow space can be realized.

[0044] In the illustrated embodiment, the fastening mechanism 2 may include a fastener 21, a second elastic member S2, and a second rope R2. The fastener 21 can be movably arranged on the base 4 along the second trajectory T2 ( Figure 7 As shown in the figure). The second elastic member S2, such as a spring, can be connected between the fastener 21 and the base 4. The actuating end R21 of the second rope R2 can be connected to the fastener 21, and the operating end R22 of the second rope R2 is located at the control end 31 of the extension rod 3. Thus, by pulling the operating end R22 of the second rope R2, the fastener 21 fastens the front end side of the blade flange 30. The ropes R1, R2 can be steel cables, that is, steel wire ropes for example.

[0045] It should be understood that the words "first", "second", etc. are used in the text to limit the features only for the convenience of distinguishing the corresponding features. Without further statement, the above words have no special meaning, so they cannot be understood as a limitation on the protection scope of the present invention.

[0046] By providing the above-mentioned fastening mechanism 2, by pulling the operating end R22 of the second rope R2 of the fastening mechanism 2 at the control end 31 of the extension rod 3, the fastener 21 at the operating end 32 of the extension rod 3 can be made to fasten backward the front end side of the mounting member. The elastic members S1 and S2 can provide an outward elastic tension when the ropes R1 and R2 are pulled, which can not only help to return to the original position, but also compensate for the flexibility of the ropes R1 and R2 to make the pulling operation smooth.

[0047] The lock piece folded by the folding device 10 can have a piece body, and the aforementioned lug can protrude from the piece body, and the piece body is placed on the mounting member. Taking the balance clip 20 as an example of the lock piece, the clip 200 of the balance clip 20 is also an example of the piece body. For the lock piece with a piece body, taking the balance clip 20 as an example, the fastening mechanism 2 can include a fastener 21 having a pressing portion 211 and an abutting portion 212. Among them, the pressing portion 211 is used to press down the clip 200 of the balance clip 20, for example, it is a pressing plate. The abutting portion 212 protrudes downward from the pressing portion 211 and is used to abut backward the front end side of the blade edge plate 30. Thereby, the fastener 21 can fasten the blade edge plate 30. The abutting portion 212 can be, for example, a convex plate protruding downward from the pressing plate (as the pressing portion 211).

[0048] In the illustrated embodiment, the fastener 21 of the fastening mechanism 2 can also have an abutting portion 213. The abutting portion 213 can extend backward from the abutting portion 212 and together with the abutting portion 212 and the pressing portion 211 form a claw shape to hook the front end 302 of the blade edge plate 30. For the balance clip 20 mounted on the blade edge plate 30, the claw shape formed by the abutting portion 213, the abutting portion 212 and the pressing portion 211 hooks the hook 202 of the balance clip 20, and the hook 202 of the balance clip 20 hooks the front end 302 of the blade edge plate 30. Thereby, the claw shape hooks the front end 302 of the blade edge plate 30.

[0049] While the above-mentioned fastening mechanism 2 fastens the mounting member and takes the mounting member as the support basis, it can also better press or abut the lock piece, especially the part of the lock piece other than the lug. This can be more conducive to folding the lug and will not affect other parts of the lock piece.

[0050] Figure 6 In the illustrated embodiment, the folding device 10 can also include an operating mechanism 5.

[0051] The operating mechanism 5 may include a first slider 61 and a first threaded member 71. The first slider 61 may be slidably disposed on the extension rod 3 and is connected to the operating end R12 of the first rope R1. The first threaded member 71 may be threadedly connected to the first slider 61. Thus, by screwing the screwing head 711 of the first threaded member 71 exposed at the control end 31, the first rope R1 can be pulled through the first slider 61. That is to say, the first slider 61, the first threaded member 71, etc. can form a first operating assembly for operating the action of the hook 11.

[0052] The operating mechanism 5 may include a second slider 62 and a second threaded member 72. The second slider 62 may be slidably disposed on the extension rod 3 and is connected to the operating end R22 of the second rope R2. The second threaded member 72 may be threadedly connected to the second slider 62. Thus, by screwing the screwing head 721 of the second threaded member 72 exposed at the control end 31, the second rope R2 can be pulled through the second slider 62. That is to say, the second slider 62, the second threaded member 72, etc. can form a second operating assembly for operating the action of the fastener 21. The threaded members 71, 72 may be adjusting screws, for example.

[0053] Generally speaking, the operating mechanism 5 may include a first operating assembly and / or a second operating assembly. When the operating mechanism 5 includes both the first operating assembly and the second operating assembly, the sliding directions of the first slider 61 of the first operating assembly and the second slider 62 of the second operating assembly may be arranged intersectingly, for example, perpendicular to each other. In this way, the space can be fully utilized and the structure is more compact.

[0054] The operating mechanism 5 may also be called the adjustment mechanism of the folding device 10. The folding mechanism 1, the fastening mechanism 2, etc. may be called the actuating mechanisms of the folding device 10, and the extension rod 3 acts as a connecting rod connecting the adjustment mechanism and the actuating mechanism of the folding device 10. The adjustment mechanism can adjust, control or manipulate the movement of the fastener 21 and the hook 11 in the actuating mechanism. The ends of the ropes S1, S2 are fixed to the sliders 61, 62. By rotating the threaded members 71, 72 of the adjustment mechanism, the movement of the sliders 61, 62 and the ropes S1, S2 can be realized. The pulleys can realize the force transmission and turning of the ropes S1, S2, which is equivalent to setting two power sources in a limited space. The operating mechanism 5 can perform remote motion control on the actuating mechanism through the ropes S1, S2 to realize the remote disassembly of the lock piece, which is especially suitable for the folding or disassembly of the lock piece in a narrow space.

[0055] It will be understood that specific terms are used in the text to describe embodiments of the present invention, such as "one embodiment", "another embodiment" and / or "some embodiments", which mean a certain feature, structure or characteristic related to at least one embodiment of the present invention. Therefore, it should be emphasized and noted that the "one embodiment" or "another embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present invention can be appropriately combined.

[0056] In the illustrated embodiment, the sliding direction of the first slider 61 can be consistent with the extending direction D1 of the extending rod 3. The sliding direction of the second slider 62 can be perpendicular to the extending direction D2, and a pulley P0 can be provided at the control end 31 of the extending rod 3. The second rope R2 can bypass the pulley P0 and be connected to the second slider 62. The pulley P0 can help the second rope R2 extend from generally along the extending direction D1 to generally along the sliding direction of the second slider 62. In the illustrated embodiment, a handle 33 can also be provided at the control end 31 of the extending rod 3. The handle 33 can be on the same side of the extending rod 3 as the second slider 62, the second threaded member 72, etc. In this way, the lateral dimension of the control end 31 of the extending rod 3 can be further reduced.

[0057] It should be understood that the two directions "perpendicular", "consistent", "parallel", etc. mentioned in the text do not need to meet the strict angular requirements in the mathematical sense, but allow a certain tolerance range. For example, the angle difference is within 20° compared to the angle required in the mathematical sense. In addition, the "along" a certain direction mentioned in the text means that there is at least a component in that direction. Preferably, the angle with that direction is within 45°, and more preferably, the angle is within 20°. For example, the extending direction D1 of the extending rod 3 can be along the front-rear direction. In the figure, it can extend obliquely upward and backward relative to the front-rear direction, and the angle between them is, for example, about 20°.

[0058] Figure 6 In [the figure], the extending rod 3 can be a hollow rod, and the ropes S1, S2 can be connected to the corresponding components after passing through the rod holes of the extending rod 3. In this way, the structure is compact and the layout is more tidy.

[0059] As described above, the above-mentioned pulling and folding device 10 can be used as a disassembly device for disassembling the balance spring 20 installed on the blade flange 30. Refer to Figure 9 . Figures 10 to 13 An example process of using the pulling and folding device 10 as a disassembly device to disassemble the balance spring 20 is shown.

[0060] Combined with Figure 5 and Figure 10, the hook 11 of the folding mechanism 1 of the folding device 10 is used to hook the pressing piece 201 of the balance circlip 20, and the fastener 21 of the fastening mechanism 2 of the folding device 10 is used to fasten the front end side of the blade flange 30. Specifically, the fastener 21 of the fastening mechanism 2 can have a claw shape, and this claw shape can hook the front end 302 of the blade flange 30, and the front end 302 of the blade flange 30 is wrapped or hooked by the hook 202 of the balance circlip 20.

[0061] Combined with Figure 5 、 Figure 7 and Figure 10 , the base 4 of the folding device 10 can be provided with a sliding groove 12. The sliding groove 12 includes a first groove 121 extending vertically and a second groove 122 extending horizontally. The second groove 121 converges with the upper side of the first groove 121 at the front side. The hook 11 cooperates with the sliding groove 12 through a sliding pin 13 and slides upward first and then backward. The sliding groove 12 can be in the form of a sliding hole extending along the first track T1 as shown in the figure, and the grooves 121 and 122 can correspondingly both be in the form of strip holes. In the illustrated embodiment, two sliding grooves 12 extending along the same track T1 are provided, so that the guiding effect on the hook 11 can be better realized.

[0062] The base 1 can be provided with a first pulley P1 above and behind the sliding groove 12, and a second pulley P2 can be provided below and behind the first pulley P1. The first rope R1 of the folding mechanism 1 can bypass the first pulley P1 from above, then bypass the second pulley P2 from below, and then extend along the extension rod 3 of the folding device 10.

[0063] In the above structure, the sliding groove 12 can play a guiding role for the movement of the hook 11, and the movement track of the hook 11 can be preset, and the movement track is the same as the opening track of the pressing piece 201 of the balance circlip 20. When the movement of the actuating mechanism is controlled through the operating mechanism 5, the hook 11 can pull open or expand the pressing piece 201 of the balance circlip 20, realizing the separation of the balance circlip 20 from the rotor blade crown 40. Therefore, it is particularly suitable for the folding device 10 to disassemble the balance circlip 20.

[0064] See Figure 8 , the second pulley P2 can provide two pulley grooves P21 for the first rope R1 and the second rope R2 of the fastening mechanism 2 to wind around respectively. The ropes R1 and R2 both wind around the same pulley P2 from below, which can make the structure more compact.

[0065] In the illustrated embodiment, the base 4 can include a first base 41 and a second base 42. The hook 11 of the folding mechanism 1 can be slidably arranged on the first base 41. For example, the aforementioned sliding groove 12 can be arranged on the first base 41. The fastener 21 of the fastening mechanism 2 can be slidably arranged on the second base 42.

[0066] Combined with Figure 5 , Figure 7 and Figure 8 , the first base 41 may have a vertical plate 411, and the vertical plate 411 may include a vertically extending vertical plate portion 411a and an inclined plate portion 411b extending forward and upward from the upper end of the vertical plate 411a. The first base 41 may also have two rear side plates 412 respectively extending backward from both sides of the inclined plate portion 411b of the vertical plate 411 ( Figure 5 in the two sides perpendicular to the paper surface). The first pulley P1 is supported between the two rear side plates 412. The first rope R1 of the folding mechanism 1 may pass through the perforation provided on the inclined plate portion 411b and be connected to the hook 11 in front of and below the inclined plate portion 411b, and the first elastic member S1 may be provided between the upper rear portion of the hook 11 and the inclined plate portion 411b. The first base 41 may also have two front side plates 413 respectively extending forward from both sides of the vertical plate portion 411a of the vertical plate 411 ( Figure 5 in the two sides perpendicular to the paper surface). By slidingly mating the sliding pins 13 fixedly connected to both sides of the hook 11 with the sliding grooves 12 of the two front side plates 413 respectively, the hook 11 may be slidably disposed between the two front side plates 413. The first base 41 may also have two rear lower side plates 414 respectively extending backward from both sides of the vertical plate portion 411a of the vertical plate 411 ( Figure 5 in the two sides perpendicular to the paper surface) for fixedly connecting with the second base 42, which will be described in detail later.

[0067] When the adjusting mechanism at the rear end of the extension rod 3, that is, the operating mechanism 5, applies force, the first rope R1 drives the hook 11 to move. The first elastic member S1 is disposed at the rear end of the hook 11. When the force of the adjusting mechanism is released, the first elastic member S1 causes the hook 11 to return to its original position.

[0068] The second base 42 may have a middle plate 421 and two vertical side plates 422, and the two vertical side plates 422 are respectively connected to both sides of the middle plate 421 ( Figure 5In (on both sides perpendicular to the paper surface). When viewed from above, the second base 42 can generally be a horizontally placed H-shaped structure. The portions of the two vertical side plates 422 located on the front side of the middle plate 421 and the middle plate 421 form a front fork structure with a front fork opening facing the front side. That is, the middle plate 421 constitutes the bottom arm of the front fork structure of the second base 42, and the portions of the two vertical side plates 422 located on the front side of the middle plate 421 respectively constitute the two front fork arms of the front fork structure. The portions of the two vertical side plates 422 located on the rear side of the middle plate 421 and the middle plate 421 form a rear fork structure with a rear fork opening facing the rear side. That is, the middle plate 421 also constitutes the bottom arm of the rear fork structure of the second base 42, and the portions of the two vertical side plates 422 located on the rear side of the middle plate 421 respectively constitute the two rear fork arms of the rear fork structure. The free ends of the two rear fork arms of the rear fork structure are connected to the operating end 32 of the extension rod 3, and the second pulley P2 can be supported between the two rear fork arms of the rear fork structure. The two front fork arms of the front fork structure can be respectively provided with sliding grooves 423 extending along the second trajectory T2. The second trajectory T2 can be in the front-rear direction, so that the fastener 21 can move horizontally. The sliding grooves 423 can be open at the front end and closed at the rear end.

[0069] The fastener 21 can have a fastening portion 211 and a sliding portion 212 connected to the rear side of the fastening portion 211. The front fastening portion 211 is used to fasten the front end side of the blade flange 30, and the rear sliding portion 212 is used for sliding cooperation with the sliding groove 423. When viewed from above, the sliding portion 212 can generally be a rectangular frame structure. The two sides of the rectangular frame structure are respectively placed in the sliding grooves 423 of the two fork arms of the front fork structure, and the first base 41 passes through the frame opening of the rectangular frame structure. In particular, the vertical plate 411 of the first base 41 passes through the frame opening of the rectangular frame structure constituting the sliding portion 212. That is, the two side frame edges 212b of the rectangular frame structure are located on both sides of the vertical plate 411. The two rear lower side plates 414 of the first base 41 are respectively fixedly connected to the two front fork arms of the front fork structure of the second base 42, for example, by fasteners, and the two rear lower side plates 414 are located between the two front fork arms. In this way, the vertical plate 411 of the first base 41 can limit the forward movement of the fastener 21. The second rope R2 can pass through the middle plate 421 and be connected to the sliding portion 212 of the fastener 21, specifically, connected to the rear frame edge 212a of the rectangular frame structure constituting the sliding portion 212. The second elastic member S2 is disposed between the rear portion (the rear frame edge 212a of the rectangular frame structure) of the sliding portion 212 and the middle plate 421. It is worth mentioning that the rear side plate 412 and the rear lower side plate 414 of the first base 41 are separated in the up-down direction, so as to leave an avoidance space for the sliding portion 212 (the rear frame edge 212a) of the fastener 21 to slide.

[0070] When the adjusting mechanism, i.e., the operating mechanism 5, at the rear end of the extension rod 3 applies force, the second rope R2 drives the fastener 21 to move. The second elastic member S2 is arranged at the rear end of the fastener 21. When the force of the adjusting mechanism is released, the second elastic member S2 returns the fastener 21 to its original position. The first rope R1 bypasses the first pulley P1, enabling the pulling force of the first rope R1 to cause the sliding pin 13 of the hook 1 to move upward first and then backward in the chute 12. The first rope R1 and the second rope R2 bypass the second pulley P2, allowing the first rope R1 and the second rope R2 not to interfere with the main structure during the force application process.

[0071] Figure 9 An exemplary schematic diagram shows the use of the folding device 10 as a disassembly device to disassemble the balance spring 20. The extension rod 3 of the folding device 10 passes through the narrow flow channel S0 between the engine tail cone 50 and the outer wall of the tail nozzle and reaches the crown 40 of the last stage rotor blade of the low-pressure turbine (between the crowns of two adjacent blades) through the flow channel between the rear support plates of the low-pressure turbine, so that both the folding mechanism 1 and the fastening mechanism 2 of the folding device 10 are aligned with the balance spring 20 installed on the blade flange 30. It can be understood that Figure 9 Only a partial structure of the engine tail nozzle is shown. That is, the actuating mechanism of the folding device 10 is extended to the crown 40 of the last stage rotor blade of the low-pressure turbine where the balance spring 20 to be disassembled is located. It is worth mentioning that the depth of the narrow space formed by the narrow flow channel S0 between the engine tail cone 50 and the outer wall of the tail nozzle and the flow channel between the rear support plates of the low-pressure turbine is usually greater than 1 m.

[0072] Figures 10 to 13 A general example process of using the folding device 10 as a disassembly device to disassemble the balance spring 20 is shown.

[0073] First, the hook 11 of the folding mechanism 1 and the fastener 21 of the fastening mechanism 2 are made to wrap around the balance spring 20. As Figure 10 shown, Figure 10 the initial placement state of the folding device 10 is shown. Among them, the hook 11 of the folding mechanism 1, especially its hook part 11a, is located below and behind the balance spring 20, while the abutting part 212 and the abrading part 213 of the fastener 21 are located in front of the balance spring 20, and the pressing part 211 is located above the balance spring 20.

[0074] Then, the entire folding device 10 can be moved. By screwing or adjusting the second threaded member 72 of the operating mechanism 5 (which can be combined with Figure 6 ), the fastener 21 of the fastening mechanism 2 is made to abut against the hook 202 at the front end of the balance spring 20. Moreover, the hook part 11a of the hook 11 of the folding mechanism 1 is located below and in front of the pressing piece 201 of the balance spring 20. As Figure 11 shown, Figure 11The state where the fastener 21 abuts against the balance spring 20 is shown. Among them, the abutting portion 212 of the fastener 21 abuts against the vertical section of the hook 202 from the front side, the abutting portion 213 abuts against the horizontal section of the hook 202 from the lower side, and the pressing portion 211 abuts against the spring piece 200 of the balance spring 20. The entire pulling and folding device 10 can be moved, and by sensing that the hook portion 11a of the pulling hook 11 touches the lower rear convex portion 303 of the blade flange 30, it is determined that the hook portion 11a of the pulling hook 11 reaches the position in front of and below the pressing piece 201 of the balance spring 20.

[0075] Then, the first threaded member 71 of the operating mechanism 5 can be screwed or adjusted (which can be combined with Figure 6 ), and guided by the first slideway 121 of the chute 12, the pulling hook 11 is moved upward, so that the hook portion 11a abuts against the front end of the pressing piece 201 of the balance spring 20. As Figure 12 shown, Figure 12 The intermediate state of the movement of the pulling hook 11 is shown. Continue to adjust the first threaded member 71, and guided by the second slideway 121 of the chute 12, the pulling hook 11 is moved backward, so that the pulling hook 11 drives the pressing piece 201 of the balance spring 20 to deform, and finally the pressing piece 201 is separated from the end face (the rear end 301 of the blade flange 30) of the low-pressure turbine last-stage rotor blade crown 40. Figure 12 The final state of the movement of the pulling hook 11 is shown, where the pressing piece 201 has been deformed to the disassembly completion state.

[0076] Finally, for example, the first threaded member 71 and the second threaded member 72 can be loosened to return them to their initial positions, so that the pulling and folding device 10 can be conveniently removed.

[0077] After the balance spring 20 reaches the Figure 12 shown disassembly completion state, the balance spring 20 can be taken out from the low-pressure turbine last-stage rotor blade crown 40. It may be necessary to use other tools for this retrieval operation, which will not be described here.

[0078] When the above-mentioned pulling and folding device is used as a disassembly device, the fastener can be sleeved on one end of the balance spring to fix it, and the force is transmitted through two ropes respectively, so that the pulling hook first moves obliquely upward to abut against the other end of the balance spring and starts to be stressed, and then the balance spring is stretched outward to a certain opening angle to separate it from the end face of the low-pressure turbine last-stage rotor blade crown. The actuating mechanism set for the structure of the balance spring of the above-mentioned disassembly device can ensure precise separation.

[0079] When operating personnel use the above-mentioned disassembly device, they can separate the balance spring and the low-pressure turbine last-stage rotor blade crown at the engine tail nozzle outlet without disassembling the engine tail nozzle, and ensure precise operation during the separation process.

[0080] Although the present invention is disclosed above in preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, all modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention fall within the protection scope defined by the claims of the present invention.

Claims

1. A folding and pulling device for folding and pulling a locking piece mounted on a mounting member, the locking piece having a tab disposed on the rear end side of the mounting member, characterized in that, The folding and pulling device includes: An extension rod having a control end and an operating end along the extension direction; A base connected to the operating end of the extension rod; A folding and pulling mechanism, including: A hook movably arranged on the base along a first track for hooking the tab; A first elastic member connected between the hook and the base; and A first rope, the actuating end of the first rope being connected to the hook, and the operating end of the first rope being located at the control end of the extension rod. Thus, by pulling the operating end of the first rope, the hook performs a folding and pulling operation on the tab; and A fastening mechanism for fastening the front end side of the mounting member; The fastening mechanism includes: A fastener movably arranged on the base along a second track; A second elastic member connected between the fastener and the base; and A second rope, the actuating end of the second rope being connected to the fastener, and the operating end of the second rope being located at the control end of the extension rod. Thus, by pulling the operating end of the second rope, the fastener fastens the front end side of the mounting member.

2. The folding and pulling device according to claim 1, wherein The locking piece has a piece body, the tab protrudes from the piece body, and the piece body is placed on the mounting member; The fastening mechanism includes a fastener having: A pressing portion for pressing the piece body downward; and A abutting portion protruding downward from the pressing portion for abutting against the front end side of the mounting member backward. Thus, the fastener fastens the mounting member.

3. The folding and pulling device according to claim 1, wherein The folding and pulling device further includes a control mechanism, and the control mechanism includes: A first slider slidably arranged on the extension rod and connected to the operating end of the first rope; and A first threaded member threadedly connected to the first slider. Thus, by screwing the screwing head of the first threaded member exposed at the control end, the first rope is pulled through the first slider.

4. The folding and pulling device according to claim 1, wherein The folding and pulling device further includes a control mechanism, and the control mechanism includes: A second slider slidably arranged on the extension rod and connected to the operating end of the second rope; and A second threaded member threadedly connected to the second slider. Thus, by screwing the screwing head of the second threaded member exposed at the control end, the second rope is pulled through the second slider.

5. The folding and pulling device according to claim 4, wherein The control mechanism further includes: A first slider slidably arranged on the extension rod and connected to the operating end of the first rope; and A first threaded member threadedly connected to the first slider. Thus, by screwing the screwing head of the first threaded member exposed at the control end, the first rope is pulled through the first slider; The sliding directions of the first slider and the second slider are arranged intersectingly.

6. The folding and pulling device according to claim 5, wherein The sliding direction of the first slider is the same as the extension direction; and / or The sliding direction of the second slider is perpendicular to the elongation direction, and a pulley is provided at the control end of the elongation rod, and the second rope bypasses the pulley and is connected to the second slider.

7. A disassembling device for disassembling a balance snap ring installed on a blade flange, characterized in that, The disassembly device is a pulling and folding device according to any one of claims 1 to 6, and the hook of the pulling and folding mechanism of the pulling and folding device is used to hook the pressing piece of the balance retaining spring, and the fastening mechanism of the pulling and folding device is used to fasten the front end side of the blade flange.

8. The disassembly device according to claim 7, wherein A chute is provided on the base of the pulling and folding device, the chute includes a first channel extending vertically and a second channel extending horizontally, the second channel converges with the upper side of the first channel at the front side, and the hook slides upward first and then backward by cooperating with the chute through a sliding pin; A first pulley is provided above and behind the chute on the base, and a second pulley is provided below and behind the first pulley. After the first rope of the pulling and folding mechanism bypasses the first pulley from above, it then bypasses the second pulley from below, and then extends along the elongation rod of the pulling and folding device.

9. The disassembly device according to claim 8, wherein The second pulley provides two grooves for the first rope and the second rope of the fastening mechanism to wind around respectively.

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