Hydraulic elastic self-centering clamping device and clamping method

Abstract

The invention discloses a hydraulic elastic self-centering clamping device and a clamping method, and belongs to the technical field of aero-engine process equipment and manufacturing. The device comprises a mounting base, a bearing, a limiting assembly, a clamp body, a piston piece and an expansion sleeve; the expansion sleeve is used for being inserted into a middle through hole of the clamp body, a cavity liquid chamber is formed between the expansion sleeve and the clamp body, the expansion sleeve is further used for clamping and limiting a turbine shaft, the clamp body is sleeved with the mounting base, the side wall of the clamp body is sleeved with the bearing, the mounting base and the clamp body are connected through the bearing, and the limiting assembly is used for limiting the bearing. According to the invention, the problem of accurate positioning of the turbine rotor on the balance equipment can be solved, and meanwhile, the phenomenon that the process bearing moves left and right is avoided.

Description

Technical Field

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

[0002] The information provided in this section is for the purpose of generally presenting the background of the present application. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present application.

[0003] In the field of aircraft engine process equipment and manufacturing technology, when conducting a dynamic balancing test of a turbine rotor assembly, a sling is used to install the turbine rotor assembly on a balancing machine, and the left and right bearings on the swing frame of the balancing machine lock the process bearings and construction rings. In order to facilitate the removal and placement of the process bearings, the inner hole of the process bearing and the outer circle of the turbine shaft are matched with clearance, which causes the entire turbine rotor assembly to tilt to the lower left during the dynamic balancing test, and the process bearing will move left and right, seriously affecting the dynamic balancing 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.

[0004] Therefore, it is necessary to improve the clamping scheme at the process bearing to solve the problem of accurate positioning of the turbine rotor on the balancing equipment, while avoiding the phenomenon of left and right movement of the process bearing.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] 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 through an expansion sleeve, and the clamping body is arranged on the outer wall of the expansion sleeve to form a cavity liquid chamber between the expansion sleeve, and the hydraulic oil is stored in the oil storage chamber in the clamping body, and the hydraulic oil is pushed into the cavity liquid chamber by changing the pressure of the oil storage chamber, and finally the side wall of the expansion sleeve is squeezed to clamp the turbine shaft, so as to avoid excessive gap between the expansion sleeve and the turbine shaft, which makes it difficult to accurately position.

[0007] At the same time, the present application also provides a clamping method using the above-mentioned hydraulic elastic self-centering clamping device.

[0008] According to one aspect of the present application, a hydraulic elastic self-centering clamping device is provided for clamping a turbine shaft, comprising a mounting seat, a bearing, a limit assembly, a clamp body, a piston member and an expansion sleeve:

[0009] The clamp body is a hollow cylindrical structure. The expansion sleeve is used to be inserted into the middle through hole of the clamp body and form a cavity liquid chamber between the expansion sleeve and the clamp body. The expansion sleeve is also used to clamp and limit the turbine shaft. The mounting seat is sleeved on the outside of the clamp body. The bearing is used to be sleeved on the side wall of the clamp body and the mounting seat is connected to the clamp body through the bearing. The limiting assembly is used to limit the bearing.

[0010] A plurality of oil storage chambers are provided in the vertical direction in the side wall of the clamp body, an oil inlet hole is provided at the top of the oil storage chamber, the oil inlet hole is used for injecting hydraulic oil, the oil inlet hole is also used for setting a first seal and sealing the oil inlet hole through the first seal, a sealing screw hole is provided at the bottom of the oil storage chamber, the sealing screw hole is used for setting a second seal and sealing the sealing screw hole through the second seal, an oil through hole is provided on the side wall of the oil storage chamber, the oil through hole is used to communicate with the cavity liquid chamber, the piston member is used to be inserted into the oil through hole, and the first seal is also used to push the piston member into the oil storage chamber to compress the hydraulic oil in the oil storage chamber to enter the cavity liquid chamber from the oil through hole, and then squeeze the side wall of the expansion sleeve toward the center of the expansion sleeve to clamp the turbine shaft.

[0011] In some embodiments of the present application, a side wall of the expansion sleeve is provided with an annular groove, and the annular groove is used to form a cavity liquid chamber with the inner wall of the through hole in the middle of the clamp body.

[0012] In some embodiments of the present application, sealing grooves are provided on the upper and lower sides of the annular groove of the side walls of the expansion sleeve, and the sealing grooves are used to set a first sealing ring and seal the gap between the expansion sleeve and the clamp body on both sides of the annular groove through the first sealing ring.

[0013] 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, and the aperture 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.

[0014] In some embodiments of the present application, the inner ring of the bearing has an interference fit with the outer wall of the clamp body, and the outer wall of the clamp body is provided with a circle of supporting platforms, which are used to limit the bottom of the bearing; the outer ring of the bearing has an interference fit with the inner wall of the mounting seat, and the inner wall of the mounting seat is provided with a circle of limiting platforms, which are used to limit the top of the bearing, and the limiting assembly is used to cooperate with the supporting platform and the limiting platform to limit the bearing at the same time.

[0015] In some embodiments of the present application, the limit assembly includes a first limit member and a second limit member, the first limit member is connected to the mounting seat, and the first limit member is used to cooperate with the limit platform to press and limit the outer ring of the bearing, and the second limit member is connected to the clamping body, and the second limit member is used to cooperate with the supporting platform to press and limit the inner ring of the bearing.

[0016] 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, and both the first plunger screw and the second plunger screw are coated with sealant.

[0017] In some embodiments of the present application, the piston member includes a piston rod, and a plurality of circles of sealing grooves are provided on the side wall of the piston rod at intervals along the axial direction thereof, and the sealing grooves are used to set the second sealing ring.

[0018] According to another aspect of the present application, a clamping method is also provided, using the above-mentioned hydraulic elastic self-centering clamping device, which includes the following steps:

[0019] S100, installing the bearing sleeve on the outer wall of the clamp body, connecting the mounting seat with the outer ring of the bearing, and limiting the bearing by a limiting assembly;

[0020] S200, inserting the expansion sleeve into the through hole in the middle of the clamp body to form a cavity liquid chamber between the expansion sleeve and the clamp body, and installing the expansion sleeve on the turbine shaft;

[0021] S300, sealing the sealing screw hole by using a second sealing member;

[0022] S400, injecting hydraulic oil into the oil storage chamber through the oil inlet hole;

[0023] S500, place the piston member into the oil storage chamber from the oil inlet hole, seal the oil inlet through the first seal, and press the piston member downward by screwing in the first seal, thereby compressing the hydraulic oil in the oil storage chamber and entering the cavity liquid chamber from the oil hole, so as to squeeze the side wall of the expansion sleeve toward the center of the expansion sleeve to clamp the turbine shaft.

[0024] 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:

[0025] Tn=(0.75-0.9)×(t+h)

[0026] Right now

[0027] Where: Tn is the thickness of the reinforcement rib; t is the wall thickness of the expansion sleeve; h is the wall thickness of the annular groove.

[0028] This application has the following beneficial effects:

[0029] The hydraulic elastic self-centering clamping device of the present application clamps and limits the turbine shaft by means of an expansion sleeve mounted on the turbine shaft, and at the same time, a clamp body is mounted on the outer wall of the expansion sleeve and forms a cavity liquid chamber with the expansion sleeve, and an oil storage chamber is provided in the clamp body, and the oil storage chamber is connected with the cavity liquid chamber. The internal pressure of the oil storage chamber can be changed by pushing a piston member by a first sealing member, and then the hydraulic oil in the oil storage chamber is pushed into the cavity liquid chamber, so as to squeeze the side wall of the expansion sleeve so that it is tightly attached to the turbine shaft to clamp and press the turbine shaft, avoid a large gap between the expansion sleeve 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.

[0030] The clamping method of the present application also has the above-mentioned beneficial effects. At the same time, the clamping method of the present application seals the oil inlet hole through the first seal and seals the sealing screw hole through the second seal. The first seal also plays the role of pushing the piston during the screwing process, which can compress the hydraulic oil in the oil storage cavity and press the hydraulic oil into the cavity liquid chamber. Therefore, the first seal has multiple effects. By disassembling the first seal and the second seal, the cleaning of the oil storage cavity can be easily achieved, and the disassembly and cleaning of the clamping device as a whole are convenient, thereby improving the overall ease of use of the device.

[0031] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above at the same time. In addition to the purposes, features and advantages described above, this application also has other purposes, features and advantages. The following will further describe this application in detail with reference to the figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the present application;

[0034] Figure 2 It is a schematic diagram of the internal structure of the preferred embodiment of the present application;

[0035] Figure 3 It is a schematic diagram of the bottom structure of a preferred embodiment of the present application;

[0036] Figure 4 is a schematic diagram of the installation of a bearing in a preferred embodiment of the present application;

[0037] Figure 5 This is a schematic structural diagram of a clamp body according to a preferred embodiment of the present application;

[0038] Figure 6 It is a structural schematic diagram of the oil storage chamber part of the preferred embodiment of the present application;

[0039] Figure 7 It is a structural schematic diagram of an expansion sleeve of a preferred embodiment of the present application;

[0040] Figure 8 It is a schematic diagram of the annular groove structure of the expansion sleeve in the preferred embodiment of the present application;

[0041] Legend: 1. Mounting seat; 2. Bearing; 3. Limiting assembly; 301. First limiting member; 302. Second limiting member; 4. Clamping body; 401. Oil inlet hole; 402. Oil storage chamber; 403. Oil through hole; 404. Transition hole; 405. Sealing screw hole; 406. Support platform; 407. Limiting groove; 5. Piston member; 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

[0042] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

[0043] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the present application; Figure 2 It is a schematic diagram of the internal structure of the preferred embodiment of the present application; Figure 3 It is a schematic diagram of the bottom structure of a preferred embodiment of the present application; Figure 4 is a schematic diagram of the installation of a bearing in a preferred embodiment of the present application; Figure 5 This is a schematic structural diagram of a clamp body according to a preferred embodiment of the present application; Figure 6 It is a structural schematic diagram of the oil storage chamber part of the preferred embodiment of the present application; Figure 7 It is a structural schematic diagram of an expansion sleeve of a preferred embodiment of the present application; Figure 8 It is a schematic diagram of the annular groove structure of the expansion sleeve in the preferred embodiment of the present application.

[0044] A hydraulic elastic self-centering clamping device is used to clamp a turbine shaft, comprising a mounting seat 1, a bearing 2, a limit assembly 3, a clamp body 4, a piston member 5 and an expansion sleeve 6:

[0045] The clamp body 4 is a hollow cylindrical structure. The expansion sleeve 6 is used to be inserted into the middle through hole of the clamp body 4 and form a cavity liquid chamber 11 between the expansion sleeve 6 and the clamp 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 clamp body 4. The bearing 2 is used to be sleeved on the side wall of the clamp body 4 and the mounting seat 1 is connected to the clamp body 4 through the bearing 2. The limiting assembly 3 is used to limit the bearing 2.

[0046] A plurality of oil storage chambers 402 are provided in the vertical direction in the side wall of the clamp body 4, an oil inlet hole 401 is provided at the top of the oil storage chamber 402, the oil inlet hole 401 is used for injecting 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, 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, 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, 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.

[0047] 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 clamp 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 opened in the clamp body 4. The oil storage chamber 402 is connected with the cavity liquid chamber 11. The internal pressure of the oil storage chamber 402 can be changed by the first sealing member pushing the piston member 5, and then the hydraulic oil in the oil storage chamber 402 is pushed into the cavity liquid chamber 11, so as to squeeze the side wall of the expansion sleeve 6 to make it 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.

[0048] Preferably, please refer to Figure 2 , 4 As shown in FIGS. 7 and 8 , the side wall of the expansion sleeve 6 is provided with an annular groove 601 , and the annular groove 601 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 .

[0049] 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 the turbine shaft to achieve 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.

[0050] Preferably, please refer to Figure 2 , 4 As shown in FIGS. 7 and 8 , the side walls of the expansion sleeve 6 are provided with sealing grooves 602 on both upper and lower sides of the annular groove 601 . The sealing grooves 602 are 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 .

[0051] It can be understood that in order to enhance the sealing effect of the cavity liquid chamber 11, the sealing grooves 602 on both sides of the annular groove 601 cooperate with the first sealing ring 9 to effectively seal the hydraulic oil in the cavity liquid chamber 11, thereby preventing the hydraulic oil in the cavity liquid chamber 11 from leaking and affecting the dynamic balancing test.

[0052] Preferably, please refer to Figure 1 As shown, a transition hole 404 is provided between the bottom of the oil storage cavity 402 and the sealing screw hole 405 , and the aperture 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 .

[0053] It is understandable that, in order to reduce the pressure shock on the second seal, a transition hole 404 with a smaller aperture is provided above the sealing screw hole 405, so that the transition hole 404 plays a buffering role, reduces the impact on the connection of the second seal, and ensures the connection stability of the second seal; at the same time, it can also ensure that the hydraulic oil enters the cavity liquid chamber 11 more smoothly from the oil 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 down below the oil hole 403, causing the hydraulic oil in the cavity liquid chamber 11 to flow back, resulting in insufficient pressure in the cavity liquid chamber 11, and failing to make the expansion sleeve 6 clamp the turbine shaft.

[0054] Preferably, please refer to Figure 2 , 3 As shown in 4, the inner ring of the bearing 2 has an interference fit with the outer wall of the clamp body 4, and the outer wall of the clamp body 4 is provided with a circle of supporting platforms 406, and the supporting platforms 406 are used to limit the bottom of the bearing 2; the outer ring of the bearing 2 has an interference fit with the inner wall of the mounting seat 1, and the inner wall of the mounting seat 1 is provided with a circle of limiting platforms, and the limiting platforms are used to limit the top of the bearing 2, and the limiting assembly 3 is used to cooperate with the supporting platform 406 and the limiting platform to limit the bearing 2 at the same time.

[0055] It can be understood that in order to avoid the bearing 2 from moving left and right and affecting the dynamic balancing test, the inner ring of the bearing 2 is interference fit with the outer wall of the clamp body 4, and the support platform 406 of the outer wall of the clamp body 4 is used to limit the bottom of the bearing 2, and the outer ring of the bearing 2 is 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 then cooperates with the limiting function of the limiting component 3 to achieve stable installation of the bearing 2 and ensure the smooth and stable progress of the dynamic balancing test.

[0056] Preferably, please refer to Figure 2 , 3As shown in Figures 4, the limiting component 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 clamp body 4, and is used to cooperate with the supporting platform 406 to press and limit the inner ring of the bearing 2.

[0057] It can be understood that the outer ring of the bearing 2 can be compressed and limited by connecting the first limit piece 301 to the mounting seat 1 and cooperating with the limit platform, and the inner ring of the bearing 2 can be compressed and limited by connecting the second limit piece 302 to the clamp 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 clamp body 4 rotate with the turbine shaft, so that the dynamic balancing test can be carried out stably and smoothly, thereby ensuring the effect of the test.

[0058] 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 installed and fastened respectively by bolts.

[0059] 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.

[0060] It can be 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 sealing effect of the entire oil storage chamber 402 can be achieved, and the impurities inside the oil storage chamber 402 can be easily cleaned by removing the first plunger screw 7 and the second plunger screw 8 to avoid problems such as blockage, which can facilitate the use of the entire clamping device. The sealant can further improve the sealing effect of the seal and prevent the leakage of hydraulic oil.

[0061] Preferably, please refer to Figure 2 As shown, the piston member 5 includes a piston rod, and a plurality of sealing grooves are arranged on the side wall of the piston rod along the axial direction thereof at intervals, and the sealing grooves are used to set the second sealing ring 10.

[0062] 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 regulating effect of the piston rod on the internal pressure of the oil storage chamber 402.

[0063] According to another aspect of the present application, a clamping method is also provided, using the above-mentioned hydraulic elastic self-centering clamping device, which includes the following steps:

[0064] S100, sleeve the bearing 2 on the outer wall of the clamp body 4, connect the mounting seat 1 with the outer ring of the bearing 2, and limit the bearing 2 by the limiting assembly 3;

[0065] S200, inserting the expansion sleeve 6 into the middle through hole of the clamp body 4 so as to form a cavity liquid chamber 11 between the expansion sleeve 6 and the clamp body 4, and sleeved on the turbine shaft through the expansion sleeve 6;

[0066] S300, sealing the sealing screw hole 405 by a second sealing member;

[0067] S400, injecting hydraulic oil into the oil storage chamber 402 through the oil inlet hole 401;

[0068] S500, place the piston member 5 from the oil inlet hole 401 into the oil storage chamber 402, seal the oil inlet 401 through the first sealing member, and press the piston member 5 downward by screwing in the first sealing member, thereby compressing the hydraulic oil in the oil storage chamber 402 and entering the cavity liquid chamber 11 through the oil hole 403, so as to squeeze the side wall of the expansion sleeve 6 toward the center of the expansion sleeve 6 to clamp the turbine shaft.

[0069] The clamping method of the present application also has the above-mentioned beneficial effects. At the same time, the clamping method of the present application seals the oil inlet hole 401 through the first seal and seals the sealing screw hole 405 through the second seal. The first seal also plays the role of pushing the piston member 5 during the screwing process, which can compress the hydraulic oil in the oil storage chamber 402 and press the hydraulic oil into the cavity liquid chamber 11. Therefore, the first seal has multiple effects. By disassembling the first seal and the second seal, the cleaning of the oil storage chamber 402 can be easily achieved, which facilitates the disassembly and cleaning of the clamping device as a whole, and improves the overall ease of use of the device.

[0070] Preferably, the side wall of the expansion sleeve 6 is provided with reinforcing ribs in the annular groove 601, and the wall thickness calculation formula of the annular groove 601 is:

[0071] Tn=(0.75-0.9)×(t+h)

[0072] Right now

[0073] Where: Tn is the thickness of the reinforcement rib; t is the wall thickness of the expansion sleeve; h is the wall thickness of the annular groove.

[0074] It is understandable that when the width of the annular groove 601 is large, in order to increase the strength of the side wall at the annular groove 601, reinforcing ribs can be set in the annular groove 601. 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 squeezed by the hydraulic oil to clamp the turbine shaft, the present application provides a method for calculating the thickness of the arc groove wall to ensure that the thickness of the annular groove wall is not too thick to make it difficult to elastically deform, and at the same time, it can also avoid the annular groove wall being too thin and prone to rupture and damage.

[0075] In summary, the hydraulic elastic clamping self-centering process clamping device of the present application has a concise and efficient structure, which not only avoids the low efficiency of ordinary bearings due to interference fit and the need for heating or freezing for disassembly and assembly, but also eliminates the gap between the inner ring of the bearing and the turbine shaft of the traditional rigid positioning process. It is reliable in positioning, easy to take and place, and the dynamic balancing test results are stable and reliable. The elastic clamping self-centering clamping solution of the present application can be widely used in scenarios that utilize the outer circle positioning of product parts, including but not limited to dynamic balancing fixtures, grinding fixtures, turning fixtures, CNC machining fixtures, etc.

[0076] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0077] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection of this application.

Claims

1. A hydraulic elastic self-centering clamping device for clamping a turbine shaft, characterized in that: It includes a mounting seat (1), a bearing (2), a limit assembly (3), a clamp body (4), a piston member (5) and an expansion sleeve (6): The clamp body (4) is a hollow cylindrical structure. The expansion sleeve (6) is used to be inserted into the middle through hole of the clamp body (4) and form a cavity liquid chamber (11) between the expansion sleeve (6) and the clamp body (4). The expansion sleeve (6) is also used to clamp and limit the turbine shaft. The mounting seat (1) is sleeved on the outer side of the clamp body (4). The bearing (2) is used to be sleeved on the side wall of the clamp body (4) and the mounting seat (1) is connected to the clamp body (4) through the bearing (2). The limiting assembly (3) is used to limit the bearing (2). A plurality of oil storage chambers (402) are provided in the side wall of the clamp body (4) in the vertical direction. An oil inlet hole (401) is provided at the top of the oil storage chamber (402). The oil inlet hole (401) is used to inject hydraulic oil. The oil inlet hole (401) is also used to set a first sealing member and seal the oil inlet hole (401) through the first sealing member. A sealing screw hole (405) is provided at the bottom of the oil storage chamber (402). The sealing screw hole (405) is used to set a second sealing member and seal the sealing screw hole (401) through the second sealing member. 05) seal, the side wall of the oil storage chamber (402) is provided with an oil hole (403), the oil 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 sealing member 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) and enter the cavity liquid chamber (11) through the oil hole (403), thereby squeezing the side wall of the expansion sleeve (6) toward the center of the expansion sleeve (6) to clamp the turbine shaft.

2. A hydraulic elastic self-centering clamping device according to claim 1, characterized in that: The side wall of the expansion sleeve (6) is provided with an annular groove (601), and the annular groove (601) 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).

3. A hydraulic elastic self-centering clamping device according to claim 2, characterized in that: The side walls of the expansion sleeve (6) are provided with sealing grooves (602) on both upper and lower sides of the annular groove (601); the sealing grooves (602) are used to set a 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).

4. A hydraulic elastic self-centering clamping device according to claim 1, characterized in that: A transition hole (404) is provided 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).

5. A hydraulic elastic self-centering clamping device according to claim 1, characterized in that: The inner ring of the bearing (2) is interference fit with the outer wall of the clamp body (4), and the outer wall of the clamp body (4) is provided with a circle of supporting platforms (406), and the supporting platforms (406) are used to limit the bottom of the bearing (2); the outer ring of the bearing (2) is interference fit with the inner wall of the mounting seat (1), and the inner wall of the mounting seat (1) is provided with a circle of limiting platforms, and the limiting platforms are used to limit the top of the bearing (2), and the limiting assembly (3) is used to simultaneously cooperate with the supporting platform (406) and the limiting platform to limit the bearing (2).

6. A hydraulic elastic self-centering clamping device according to claim 5, characterized in that: The limiting component (3) comprises a first limiting component (301) and a second limiting component (302), wherein the first limiting component (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), and the second limiting component (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).

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

8. A hydraulic elastic self-centering clamping device according to claim 1, characterized in that: The piston member (5) comprises a piston rod, and a plurality of sealing grooves are arranged at intervals along the axial direction of the piston rod on the side wall of the piston rod, and the sealing grooves are used to arrange a second sealing ring (10).

9. A clamping method, characterized in that: The hydraulic elastic self-centering clamping device according to any one of claims 1 to 7 is used, which comprises the following steps: S100, sleeve the bearing (2) on the outer wall of the clamp body (4), connect the mounting seat (1) with the outer ring of the bearing (2), and limit the bearing (2) by means of the limit assembly (3); S200, inserting the expansion sleeve (6) into the middle through hole of the clamp body (4) so ​​that a cavity liquid chamber (11) is formed between the expansion sleeve (6) and the clamp body (4), and the expansion sleeve (6) is sleeved on the turbine shaft; S300, sealing the sealing screw hole (405) by a second sealing member; S400, injecting hydraulic oil into the oil storage chamber (402) through the oil inlet hole (401); S500, placing the piston member (5) into the oil storage chamber (402) from the oil inlet hole (401), sealing the oil inlet (401) through the first sealing member, and pressing the piston member (5) downward by screwing in the first sealing member, thereby compressing the hydraulic oil in the oil storage chamber (402) and entering the cavity liquid chamber (11) through the oil hole (403), so as to squeeze the side wall of the expansion sleeve (6) toward the center of the expansion sleeve (6) to clamp the turbine shaft.

10. A hydraulic elastic self-centering clamping device and clamping method according to claim 9, characterized in that: The side wall of the expansion sleeve (6) is provided with reinforcing ribs in the annular groove (601). The wall thickness of the annular groove (601) is calculated as follows: Tn=(0.75-0.9)×(t+h) Right now Where: Tn is the thickness of the reinforcement rib; t is the wall thickness of the expansion sleeve; h is the wall thickness of the annular groove.

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