Hydro-elastic self-centering clamping device and method

Abstract

The application discloses a hydraulic elastic self-centering clamping device and a clamping method, and belongs to the field of aero-engine process equipment and manufacturing technology.The device comprises a mounting seat, a bearing, a limiting assembly, a clamping body, a piston and a sleeve.The clamping body is a hollow cylindrical structure, the sleeve is used for being inserted into a middle through hole of the clamping body and forming a cavity liquid chamber between the sleeve and the clamping body, and the sleeve is also used for clamping and limiting a turbine shaft.The mounting seat is sleeved on the outside of the clamping body, the bearing is used for being sleeved on the side wall of the clamping body and connecting the mounting seat and the clamping body through the bearing, and the limiting assembly is used for limiting the bearing.The application can solve the problem of accurate positioning of a turbine rotor on a balancing equipment, and simultaneously avoid the phenomenon of left and right movement of a process bearing.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aero-engine process equipment and manufacturing technology, in particular, to a hydraulic elastic self-centering clamping device. In addition, the present application also relates to a clamping method applied to the above-mentioned hydraulic elastic self-centering clamping device. BACKGROUND

[0002] In the field of aero-engine process equipment and manufacturing technology, when a turbine rotor combination dynamic balance test is carried out, a hoist is used to install the turbine rotor combination on a balancing machine, and the left and right bearing bush locking process bearings and construction rings on the balancing machine swing frame. In order to facilitate the taking and placing of the process bearing, the inner hole of the process bearing is matched with the outer circle of the turbine shaft in a clearance fit, which causes the whole turbine rotor combination to tilt to the left and down during the dynamic balance test, and the process bearing will move left and right, which seriously affects the dynamic balance test. In addition, ordinary process bearings need to be heated or frozen for disassembly and assembly due to interference fit, and the disassembly and assembly efficiency is low.

[0003] Therefore, it is necessary to improve the clamping scheme at the process bearing position to solve the problem of accurate positioning of the turbine rotor on the balancing equipment, and to avoid the phenomenon of left and right movement of the process bearing. SUMMARY

[0004] In view of at least one of the above technical problems, the present application provides a hydraulic elastic self-centering clamping device, which can clamp the turbine shaft by expanding the sleeve, and the sleeve is provided with a cavity liquid chamber by setting a clamping body outside the sleeve wall and between the sleeve, storing hydraulic oil in the clamping body inner oil storage cavity, and pushing the hydraulic oil into the cavity liquid chamber by changing the pressure of the oil storage cavity, and finally clamping the turbine shaft by extruding the sleeve side wall, avoiding the existence of too large gap between the sleeve and the turbine shaft, which leads to difficult accurate positioning.

[0005] The present application also provides a clamping method using the above-mentioned hydraulic elastic self-centering clamping device.

[0006] According to one aspect of the present application, a hydraulic elastic self-centering clamping device for clamping a turbine shaft is provided, comprising a mounting seat, a bearing, a limiting assembly, a clamping body, a piston and a sleeve:

[0007] The clamping body is a hollow cylindrical structure, the sleeve is used to insert into the middle through hole of the clamping body and form a cavity liquid chamber between the sleeve and the clamping body, and the sleeve is also used to clamp and limit the turbine shaft, the mounting seat is sleeved on the outside of the clamping body, the bearing is used to sleeve on the side wall of the clamping body and connect the mounting seat and the clamping body through the bearing, and the limiting assembly is used to limit the bearing;

[0008] The side wall of the clamp body is provided with a plurality of oil storage cavities in the vertical direction. The top of the oil storage cavity is provided with an oil inlet hole. The oil inlet hole is used for injecting hydraulic oil and setting a first sealing member to seal the oil inlet hole. The bottom of the oil storage cavity is provided with a sealing screw hole. The sealing screw hole is used for setting a second sealing member to seal the sealing screw hole. The side wall of the oil storage cavity is provided with an oil passing hole for communicating with the cavity liquid chamber. The piston member is inserted into the oil passing hole. The first sealing member is used to push the piston member into the oil storage cavity to compress the hydraulic oil in the oil storage cavity and make the hydraulic oil enter the cavity liquid chamber from the oil passing hole, thereby extruding the side wall of the expansion sleeve to the center of the expansion sleeve to clamp the turbine shaft.

[0009] In some embodiments of the present application, the side wall of the expansion sleeve is provided with an annular groove for forming a cavity liquid chamber with the inner wall of the middle through hole of the clamp body.

[0010] In some embodiments of the present application, the side wall of the expansion sleeve is provided with a sealing groove on both sides of the annular groove. The sealing groove is used for setting a first sealing ring to seal the gap between the expansion sleeve and the clamp body on both sides of the annular groove.

[0011] In some embodiments of the present application, a transition hole is provided between the bottom of the oil storage cavity and the sealing screw hole. The diameter of the transition hole is smaller than the diameter of the oil storage cavity and also smaller than the diameter of the sealing screw hole.

[0012] In some embodiments of the present application, the inner ring of the bearing is in interference fit with the outer wall of the clamp body. The outer wall of the clamp body is provided with a supporting platform for limiting the bottom of the bearing. The outer ring of the bearing is in interference fit with the inner wall of the mounting seat. The inner wall of the mounting seat is provided with a limiting platform for limiting the top of the bearing. The limiting assembly is used to limit the bearing by cooperating with the supporting platform and the limiting platform.

[0013] In some embodiments of the present application, the limiting assembly includes a first limiting member and a second limiting member. The first limiting member is connected with the mounting seat and is used to press and limit the outer ring of the bearing by cooperating with the limiting platform. The second limiting member is connected with the clamp body and is used to press and limit the inner ring of the bearing by cooperating with the supporting platform.

[0014] In some embodiments of the present application, the first sealing member includes a first plunger screw, and the second sealing member includes a second plunger screw. The first plunger screw and the second plunger screw are coated with sealing glue.

[0015] In some embodiments of the present application, the piston member includes a piston rod. A plurality of sealing grooves are provided on the side wall of the piston rod along the axial direction. The sealing grooves are used for setting a second sealing ring.

[0016] According to another aspect of the present application, a clamping method is also provided, which uses the hydraulic elastic self-centering clamping device described above, and comprises the following steps:

[0017] S100, the bearing sleeve is arranged on the outer wall of the clamping body, the mounting seat is connected with the outer ring of the bearing, and the bearing is limited by the limiting assembly;

[0018] S200, the expansion sleeve is inserted into the through hole in the middle of the clamping body to form a cavity liquid chamber between the expansion sleeve and the clamping body, and the expansion sleeve is arranged on the turbine shaft;

[0019] S300, the sealing screw hole is sealed by the second sealing element;

[0020] S400, hydraulic oil is injected into the oil storage cavity through the oil inlet hole;

[0021] S500, the piston element is placed into the oil storage cavity from the oil inlet hole, the oil inlet hole is sealed by the first sealing element, and the piston element is pressed down by screwing the first sealing element, so that the hydraulic oil in the oil storage cavity is compressed and enters the cavity liquid chamber from the oil passing hole, so that the side wall of the expansion sleeve is pressed towards the center of the expansion sleeve to clamp the turbine shaft.

[0022] In some embodiments of the present application, the side wall of the expansion sleeve is provided with a reinforcing rib in the annular groove, and the wall thickness calculation formula of the annular groove is:

[0023] Tn = (0.75-0.9) x (t+h)

[0024] That is,

[0025] In the formula, Tn is the thickness of the reinforcing rib, t is the wall thickness of the expansion sleeve, and h is the wall thickness of the annular groove.

[0026] The present application has the following beneficial effects:

[0027] The hydraulic elastic self-centering clamping device of the present application clamps and limits the turbine shaft by arranging the expansion sleeve on the turbine shaft, and the clamping body is arranged on the outer wall of the expansion sleeve and forms a cavity liquid chamber with the expansion sleeve. The oil storage cavity is arranged in the clamping body, the oil storage cavity is communicated with the cavity liquid chamber, the internal pressure of the oil storage cavity can be changed by pushing the piston element through the first sealing element, and then the hydraulic oil in the oil storage cavity is pushed into the cavity liquid chamber to press the side wall of the expansion sleeve to tightly contact with the turbine shaft, so that the turbine shaft is clamped and pressed tightly. The gap between the expansion sleeve and the turbine shaft is avoided, the inclination of the entire turbine rotor combination during dynamic balance test is avoided, and the influence on the dynamic balance test is reduced.

[0028] The clamping method of the application also has the above beneficial effects. Meanwhile, the clamping method of the application seals the oil inlet hole through the first sealing member, seals the sealing screw hole through the second sealing member, and the first sealing member also plays a role of pushing the piston member during screwing, can realize the compression of the hydraulic oil in the oil storage cavity, and press the hydraulic oil into the cavity liquid chamber, so the first sealing member has multiple effects. The first sealing member and the second sealing member can be disassembled to facilitate the cleaning of the oil storage cavity, facilitate the disassembly and cleaning of the whole clamping device, and improve the use convenience of the whole device.

[0029] Of course, implementing any product of the application does not necessarily need to achieve all the advantages described above. In addition to the purposes, features and advantages described above, the application has other purposes, features and advantages. The application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application, and assist in explaining the application. In the drawings:

[0031] Figure 1 is a schematic diagram of the overall structure of the preferred embodiment of the application;

[0032] Figure 2 is a schematic diagram of the internal structure of the preferred embodiment of the application;

[0033] Figure 3 is a schematic diagram of the bottom structure of the preferred embodiment of the application;

[0034] Figure 4 is a schematic diagram of the installation of the bearing of the preferred embodiment of the application;

[0035] Figure 5 is a schematic diagram of the structure of the clamping body of the preferred embodiment of the application;

[0036] Figure 6 is a schematic diagram of the structure of the oil storage cavity part of the preferred embodiment of the application;

[0037] Figure 7 is a schematic diagram of the structure of the expansion sleeve of the preferred embodiment of the application;

[0038] Figure 8 is a schematic diagram of the annular groove structure of the expansion sleeve of the preferred embodiment of the application;

[0039] Figure legend: 1, mounting seat; 2, bearing; 3, limiting assembly; 301, first limiting piece; 302, second limiting piece; 4, clamping body; 401, oil inlet hole; 402, oil storage cavity; 403, oil passing hole; 404, transition hole; 405, sealing screw hole; 406, abutting platform; 407, limiting groove; 5, piston piece; 6, expansion sleeve; 601, annular groove; 602, sealing groove; 7, first plunger screw; 8, second plunger screw; 9, first sealing ring; 10, second sealing ring; 11, cavity liquid chamber. DETAILED DESCRIPTION

[0040] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0041] Figure 1 is a schematic diagram of the overall structure of the preferred embodiment of the present application; Figure 2 is a schematic diagram of the internal structure of the preferred embodiment of the present application; Figure 3 is a schematic diagram of the bottom structure of the preferred embodiment of the present application; Figure 4 is a schematic diagram of the installation of the bearing of the preferred embodiment of the present application; Figure 5 is a schematic diagram of the structure of the clamping body of the preferred embodiment of the present application; Figure 6 is a schematic diagram of the structure of the oil storage cavity part of the preferred embodiment of the present application; Figure 7 is a schematic diagram of the structure of the expansion sleeve of the preferred embodiment of the present application; Figure 8 is a schematic diagram of the annular groove structure of the expansion sleeve of the preferred embodiment of the present application.

[0042] A hydraulic elastic self-centering clamping device for clamping a turbine shaft, comprising a mounting seat 1, a bearing 2, a limiting assembly 3, a clamping body 4, a piston piece 5 and an expansion sleeve 6:

[0043] The clamping body 4 is a hollow cylindrical structure, the expansion sleeve 6 is used to be inserted into the middle through hole of the clamping body 4 and form a cavity liquid chamber 11 between the expansion sleeve 6 and the clamping body 4, the expansion sleeve 6 is also used to clamp and limit the turbine shaft, the mounting seat 1 is sleeved on the outside of the clamping body 4, the bearing 2 is used to be sleeved on the side wall of the clamping body 4 and connect the mounting seat 1 and the clamping body 4 through the bearing 2, and the limiting assembly 3 is used to limit the bearing 2;

[0044] A plurality of oil storage chambers 402 are provided in the vertical direction in the side wall of the clamp body 4, and an oil inlet hole 401 is provided at the top of the oil storage chamber 402, and the oil inlet hole 401 is used to inject hydraulic oil. The oil inlet hole 401 is also used to set a first seal and seal the oil inlet hole 401 through the first seal. A sealing screw hole 405 is provided at the bottom of the oil storage chamber 402, and the sealing screw hole 405 is used to set a second seal and seal the sealing screw hole 405 through the second seal. An oil through hole 403 is provided on the side wall of the oil storage chamber 402, and the oil through hole 403 is used to communicate with the cavity liquid chamber 11. The piston member 5 is used to be inserted into the oil inlet hole 401, and the first seal is also used to push the piston member 5 into the oil storage chamber 402 to compress the hydraulic oil in the oil storage chamber 402 into the cavity liquid chamber 11 from the oil through hole 403, and then squeeze the side wall of the expansion sleeve 6 toward the center of the expansion sleeve 6 to clamp the turbine shaft.

[0045] The hydraulic elastic self-centering clamping device of the present application is mounted on the turbine shaft by an expansion sleeve 6 to clamp and limit the turbine shaft. At the same time, the clamping body 4 is mounted on the outer wall of the expansion sleeve 6 and forms a cavity liquid chamber 11 with the expansion sleeve 6. An oil storage chamber 402 is provided in the clamping body 4. The oil storage chamber 402 is connected to the cavity liquid chamber 11. The internal pressure of the oil storage chamber 402 can be changed by pushing the piston member 5 through the first sealing member, thereby pushing the hydraulic oil in the oil storage chamber 402 into the cavity liquid chamber 11, so as to squeeze the side wall of the expansion sleeve 6 so that it is close to the turbine shaft to clamp and press the turbine shaft, avoid a large gap between the expansion sleeve 6 and the turbine shaft, avoid the phenomenon of tilting of the entire turbine rotor assembly during the dynamic balancing test, and reduce the impact on the dynamic balancing test.

[0046] Preferably, please refer to Figure 2 、 4 As shown in Figures 7 and 8, the side wall of the expansion sleeve 6 is provided with an annular groove 601, which is used to form a cavity liquid chamber 11 with the inner wall of the through hole in the middle of the clamp body 4.

[0047] It can be understood that by providing an annular groove 601 on the side wall of the expansion sleeve 6, it is convenient to form a cavity liquid chamber 11 between the annular groove 601 and the clamp body 4. At the same time, the wall thickness of the side wall of the expansion sleeve 6 at the annular groove 601 is thinner and more elastic, which can facilitate the hydraulic oil to push and squeeze against the turbine shaft, thereby achieving a better clamping effect on the turbine shaft. When the pressure in the oil storage chamber 402 is reduced, the side wall at the annular groove 601 can rebound to loosen the turbine shaft, making it easy to disassemble.

[0048] Preferably, please refer to Figure 2 、 4 As shown in Figures 7 and 8, the side walls of the expansion sleeve 6 are provided with sealing grooves 602 on the upper and lower sides of the annular groove 601. The sealing groove 602 is used to set the first sealing ring 9 and seal the gap between the expansion sleeve 6 and the clamp body 4 on both sides of the annular groove 601 through the first sealing ring 9.

[0049] It can be understood that, in order to strengthen the sealing effect of the cavity liquid chamber 11, the hydraulic oil in the cavity liquid chamber 11 can be effectively sealed by cooperating the sealing grooves 602 on both sides of the annular groove 601 with the first sealing ring 9, so as to avoid leakage of the hydraulic oil in the cavity liquid chamber 11 and affect the dynamic balance test.

[0050] Preferably, referring to Figure 1 As shown in the figure, a transition hole 404 is arranged between the bottom of the oil storage cavity 402 and the sealing screw hole 405, the diameter of the transition hole 404 is smaller than the diameter of the oil storage cavity 402, and also smaller than the diameter of the sealing screw hole 405.

[0051] It can be understood that, in order to reduce the pressure impact on the second sealing member, the transition hole 404 with a small diameter is arranged above the sealing screw hole 405, so that the transition hole 404 plays a buffering role, reduces the influence on the connection of the second sealing member, and ensures the connection stability of the second sealing member; at the same time, the hydraulic oil can more smoothly enter the cavity liquid chamber 11 from the oil passing hole 403. In addition, the side wall of the transition hole 404 can also limit the piston member 5, preventing the piston member 5 from moving downward below the oil passing hole 403, so that the hydraulic oil in the cavity liquid chamber 11 flows back, resulting in insufficient pressure in the cavity liquid chamber 11, and the expansion sleeve 6 cannot clamp the turbine shaft.

[0052] Preferably, referring to Figure 2 、 3 , 4, the inner ring of the bearing 2 is in interference fit with the outer wall of the clamping body 4, the outer wall of the clamping body 4 is provided with a supporting platform 406, which is used for limiting the bottom of the bearing 2; the outer ring of the bearing 2 is in interference fit with the inner wall of the mounting seat 1, and the inner wall of the mounting seat 1 is provided with a limiting platform, which is used for limiting the top of the bearing 2, and the limiting assembly 3 is used for limiting the bearing 2 by cooperating with the supporting platform 406 and the limiting platform.

[0053] It can be understood that, in order to avoid the left and right movement of the bearing 2 affecting the dynamic balance test, the inner ring of the bearing 2 is in interference fit with the outer wall of the clamping body 4, and the supporting platform 406 on the outer wall of the clamping body 4 limits the bottom of the bearing 2, and the outer ring of the bearing 2 is in interference fit with the inner wall of the mounting seat 1, and the limiting platform of the mounting seat 1 limits the top of the bearing 2, and the limiting assembly 3 is used for limiting the bearing 2 by cooperating with the supporting platform 406 and the limiting platform.

[0054] Preferably, referring to Figure 2 、 3As shown in Figures 4 and 5, the limiting assembly 3 includes a first limiting member 301 and a second limiting member 302. The first limiting member 301 is connected to the mounting seat 1, and is used to cooperate with the limiting platform to press and limit the outer ring of the bearing 2. The second limiting member 302 is connected to the clamping body 4, and is used to cooperate with the supporting platform 406 to press and limit the inner ring of the bearing 2.

[0055] It can be understood that the outer ring of the bearing 2 can be pressed and limited by connecting the first limit member 301 to the mounting seat 1 and cooperating with the limit platform, and the inner ring of the bearing 2 can be pressed and limited by connecting the second limit member 302 to the clamping body 4 and cooperating with the platform, thereby realizing a stable connection between the inner and outer rings of the bearing 2, and preventing the phenomenon of left and right movement. During operation, the turbine shaft is clamped by the inner wall of the expansion sleeve 6, and the rotatable parts such as the inner ring of the bearing 2 and the clamping body 4 rotate with the turbine shaft, so that the dynamic balancing test can be carried out stably and smoothly, and the effect of the test is guaranteed.

[0056] It should be noted that the first position-limiting member 301 and the second position-limiting member 302 may both be annular plate structures, and the first position-limiting member 301 and the second position-limiting member 302 may be respectively installed and fastened by bolts.

[0057] Preferably, please refer to Figure 2 As shown, the first sealing member includes a first plunger screw 7, and the second sealing member includes a second plunger screw 8. Both the first plunger screw 7 and the second plunger screw 8 are coated with sealant.

[0058] It is understood that by sealing the oil inlet hole 401 and the sealing screw hole 405 respectively by the first plunger screw 7 and the second plunger screw 8, the entire oil storage chamber 402 can be sealed. Furthermore, the interior of the oil storage chamber 402 can be easily cleaned of impurities by removing the first plunger screw 7 and the second plunger screw 8, thereby preventing blockage and other problems, and facilitating the use of the entire clamping device. The sealant can further enhance the sealing effect of the seal and prevent leakage of hydraulic oil.

[0059] Preferably, please refer to Figure 2 As shown, the piston member 5 includes a piston rod, and a plurality of sealing grooves are provided on the side wall of the piston rod along the axial direction thereof at intervals, and the sealing grooves are used to arrange the second sealing ring 10 .

[0060] It can be understood that the piston rod can push the hydraulic oil in the oil storage chamber 402 into the cavity liquid chamber 11, and the second sealing ring 10 can strengthen the sealing effect between the piston rod and the inner wall of the oil storage chamber 402, reduce the overflow of hydraulic oil from the piston rod, and ensure the piston rod's regulating effect on the internal pressure of the oil storage chamber 402.

[0061] According to another aspect of the present application, a clamping method is also provided, which uses the hydraulic elastic self-centering clamping device described above, and comprises the following steps:

[0062] S100, the bearing 2 is sleeved on the outer wall of the clamping body 4, the mounting seat 1 is connected with the outer ring of the bearing 2, and the bearing 2 is limited by the limiting assembly 3;

[0063] S200, the expansion sleeve 6 is inserted into the through hole in the middle of the clamping body 4, and the cavity liquid chamber 11 is formed between the expansion sleeve 6 and the clamping body 4, and the expansion sleeve 6 is sleeved on the turbine shaft;

[0064] S300, the sealing screw hole 405 is sealed by the second sealing element;

[0065] S400, the hydraulic oil is injected into the oil storage cavity 402 through the oil inlet hole 401;

[0066] S500, the piston element 5 is placed into the oil storage cavity 402 from the oil inlet hole 401, the oil inlet hole 401 is sealed by the first sealing element, the piston element 5 is pressed down by screwing the first sealing element, and then the hydraulic oil in the oil storage cavity 402 is compressed and enters the cavity liquid chamber 11 from the oil passing hole 403, so that the side wall of the expansion sleeve 6 is pressed to the center direction of the expansion sleeve 6 to clamp the turbine shaft.

[0067] The clamping method of the present application also has the beneficial effects described above. At the same time, the clamping method of the present application seals the oil inlet hole 401 by the first sealing element, and seals the sealing screw hole 405 by the second sealing element. The first sealing element also pushes the piston element 5 during screwing, and can compress the hydraulic oil in the oil storage cavity 402 and press the hydraulic oil into the cavity liquid chamber 11, so that the first sealing element has multiple effects. By disassembling the first sealing element and the second sealing element, the oil storage cavity 402 can be easily cleaned, the overall clamping device can be easily disassembled and cleaned, and the overall use convenience of the device is improved.

[0068] Preferably, the side wall of the expansion sleeve 6 is provided with a reinforcing rib in the annular groove 601, and the wall thickness calculation formula of the annular groove 601 is:

[0069] Tn=(0.75-0.9)×(t+h)

[0070] That is

[0071] In the formula: Tn is the thickness of the reinforcing rib; t is the wall thickness of the expansion sleeve; h is the wall thickness of the annular groove.

[0072] It can be understood that when the width of the annular groove 601 is large, in order to improve the strength of the side wall at the annular groove 601, a reinforcing rib can be arranged in the annular groove 601, and at the same time, in order not to affect the elasticity of the side wall at the annular groove 601 and ensure that the side wall is smoothly extruded by hydraulic oil to clamp the turbine shaft, the application provides a method for calculating the thickness of the arc-shaped groove wall, which ensures that the thickness of the annular groove wall is not too thick to cause elastic deformation, and also avoids that the thickness of the annular groove wall is too thin to cause rupture and damage.

[0073] In summary, the hydraulic elastic clamping self-centering process clamping device of the application has a simple and efficient structure, avoids the low efficiency caused by heating or freezing disassembly of ordinary bearings due to interference fit, eliminates the gap between the inner ring of the traditional rigid positioning process bearing and the turbine shaft, and is reliable in positioning, convenient to take and place, and stable and reliable in dynamic balance test results. The elastic clamping self-centering clamping scheme of the application can be widely applied to scenes of positioning by using the outer circle of product parts, including but not limited to dynamic balance tooling, grinding fixture, turning fixture, numerical control machining fixture, etc.

[0074] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such a process, method, article or device.

[0075] The principles and implementation modes of the application are described by applying specific examples in this document, and the above examples are only used to help understand the method of the application and its core idea. The above description is only the preferred implementation mode of the application. It should be noted that due to the limited nature of the language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the application, and the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical scheme to other occasions without improvement, shall be regarded as the protection of the application.

Claims

1. A hydraulic resilient self-centering chucking device for chucking a turbine shaft, characterized by, It comprises a mounting base (1), a bearing (2), a limiting assembly (3), a clamping body (4), a piston piece (5) and a sleeve (6): The clamping body (4) is a hollow cylindrical structure, the sleeve (6) is inserted into the middle through hole of the clamping body (4) and forms a cavity liquid chamber (11) between the sleeve (6) and the clamping body (4), the sleeve (6) is also used for clamping and limiting the turbine shaft, the mounting base (1) is sleeved on the outside of the clamping body (4), the bearing (2) is used for sleeving on the side wall of the clamping body (4) and connecting the mounting base (1) and the clamping body (4) through the bearing (2), and the limiting assembly (3) is used for limiting the bearing (2); A plurality of oil storage cavities (402) are formed in the side wall of the clamping body (4) in the vertical direction, an oil inlet hole (401) is formed in the top of the oil storage cavity (402), the oil inlet hole (401) is used for injecting hydraulic oil, the oil inlet hole (401) is also used for arranging a first sealing piece and sealing the oil inlet hole (401) through the first sealing piece, a sealing screw hole (405) is formed in the bottom of the oil storage cavity (402), the sealing screw hole (405) is used for arranging a second sealing piece and sealing the sealing screw hole (405) through the second sealing piece, an oil passing hole (403) is formed in the side wall of the oil storage cavity (402), the oil passing hole (403) is used for communicating with the cavity liquid chamber (11), the piston piece (5) is inserted into the oil inlet hole (401), the first sealing piece is also used for pushing the piston piece (5) into the oil storage cavity (402) to compress the hydraulic oil in the oil storage cavity (402) to enter the cavity liquid chamber (11) from the oil passing hole (403), and then the side wall of the sleeve (6) is extruded to the center direction of the sleeve (6) to clamp the turbine shaft; an annular groove (601) is formed in the side wall of the sleeve (6), and the annular groove (601) is used for forming the cavity liquid chamber (11) with the inner wall of the middle through hole of the clamping body (4); A reinforcing rib is arranged in the annular groove (601) of the side wall of the sleeve (6), and the wall thickness calculation formula of the annular groove (601) is: Tn = (0.75-0.9) x (t+h) That is In the formula, Tn is the thickness of the reinforcing rib, t is the wall thickness of the sleeve, and h is the wall thickness of the annular groove.

2. A hydraulic elastic self-centering clamping device according to claim 1, characterized in that Sealing grooves (602) are formed in the upper and lower sides of the annular groove (601) of the side wall of the sleeve (6), the sealing grooves (602) are used for arranging a first sealing ring (9) and sealing the gap between the sleeve (6) and the clamping body (4) on both sides of the annular groove (601) through the first sealing ring (9).

3. The hydraulic elastic self-centering clamping device according to claim 1, characterized in that A transition hole (404) is formed between the bottom of the oil storage cavity (402) and the sealing screw hole (405), the diameter of the transition hole (404) is smaller than the diameter of the oil storage cavity (402) and also smaller than the diameter of the sealing screw hole (405).

4. The hydraulic elastic self-centering clamping device according to claim 1, characterized in that The inner ring of the bearing (2) is in interference fit with the outer wall of the clamping body (4), the outer wall of the clamping body (4) is provided with a bearing platform (406) for limiting the bottom of the bearing (2); the outer ring of the bearing (2) is in interference fit with the inner wall of the mounting seat (1), the inner wall of the mounting seat (1) is provided with a limiting platform for limiting the top of the bearing (2), and the limiting assembly (3) is used for limiting the bearing (2) by cooperating with the bearing platform (406) and the limiting platform.

5. A hydraulic elastic self-centering clamping device according to claim 4, characterized in that The limiting assembly (3) comprises a first limiting piece (301) and a second limiting piece (302), the first limiting piece (301) is connected with the mounting seat (1), and the first limiting piece (301) is used for pressing and limiting the outer ring of the bearing (2) by cooperating with the limiting platform, and the second limiting piece (302) is connected with the clamping body (4), and the second limiting piece (302) is used for pressing and limiting the inner ring of the bearing (2) by cooperating with the bearing platform (406).

6. A hydraulic elastic self-centering clamping device according to claim 1, characterized in that The first sealing piece comprises a first plunger screw (7), the second sealing piece comprises a second plunger screw (8), and the first plunger screw (7) and the second plunger screw (8) are coated with sealing glue.

7. The hydraulic elastically self-centering clamping device according to claim 1, characterized in that The piston piece (5) comprises a piston rod, and a plurality of sealing grooves are arranged on the side wall of the piston rod in the axial direction and are spaced apart, and the sealing grooves are used for arranging the second sealing ring (10).

8. A clamping method characterized by, The hydraulic elastic self-centering clamping device comprises the following steps: S100, the bearing (2) is sleeved on the outer wall of the clamping body (4), the mounting seat (1) is connected with the outer ring of the bearing (2), and the bearing (2) is limited by the limiting assembly (3); S200, the expansion sleeve (6) is inserted into the middle through hole of the clamping body (4) to form a cavity liquid chamber (11) between the expansion sleeve (6) and the clamping body (4), and the expansion sleeve (6) is sleeved on the turbine shaft; S300, the sealing screw hole (405) is sealed by the second sealing piece; S400, hydraulic oil is injected into the oil storage cavity (402) through the oil inlet hole (401); S500, the piston piece (5) is placed into the oil storage cavity (402) from the oil inlet hole (401), the oil inlet hole (401) is sealed by the first sealing piece, the piston piece (5) is pressed down by rotating the first sealing piece, and then the hydraulic oil in the oil storage cavity (402) is compressed and enters the cavity liquid chamber (11) from the oil passing hole (403), so that the side wall of the expansion sleeve (6) is extruded to the center of the expansion sleeve (6) to clamp the turbine shaft.

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