A special fixture based on the guide pad of a high-speed tilting pad journal bearing

Abstract

The present invention belongs to the technical field of bearing processing, and particularly relates to a special fixture for a guide pad of a high-speed radially tilting pad journal bearing, comprising: an outer turntable rotatably arranged in the horizontal direction; a first power assembly for driving the outer turntable to rotate; an outer cylinder arranged at the central position of the outer turntable, with an annular boss radially inwardly arranged at the lower end of the outer cylinder, the inner diameter of the annular boss being greater than the inner diameter of the guide pad, and the upper end surface of the annular boss forming a support surface for supporting each guide pad; a limiting assembly for circumferentially limiting adjacent guide pads placed on the annular boss; a clamping assembly for radially limiting each guide pad placed on the annular boss; and a control unit for controlling the operating states of each limiting assembly and each clamping assembly to restrict the circumferential and axial movement of each guide pad located on the annular boss, or to release the restriction on each guide pad.

Description

Technical Field

[0001] The present invention belongs to the technical field of bearing processing, and particularly relates to a special fixture for a guide pad of a high-speed radially tilting pad journal bearing. Background Art

[0002] High-speed sliding bearings are mainly applied in fields such as high-speed gearboxes, high-speed compressors, high-speed motors, steam turbines, generators, expanders, high-speed pumps, turbochargers, aero-engines, etc.

[0003] The structure of a radially tilting pad journal bearing is as Figure 1 shown, and the structure of a tilting pad guide pad is as Figure 2 shown. The tilting pads are installed in the inner hole of the bearing body through the limiting holes on the bearing end cover. The back of the tilting pad is in internal and external cylindrical contact with the inner hole of the bearing body. The radius of the back of the guide pad is smaller than the radius of the inner hole of the bearing body. Thus, the guide pad can freely swing with different rotational speeds, loads, and bearing temperatures during operation, thereby forming an oil wedge and generating oil film pressure to achieve the load-bearing of the bearing.

[0004] Currently, the processing technological process of the tilting guide pads adopted by most bearing manufacturers is as Figure 3 shown. The disadvantages of this process are as follows: After the back of the guide pad is cut into pieces by wire cutting, a tooling is used for processing. The rationality of the tooling directly affects the processing accuracy and efficiency. Moreover, during processing, it is intermittent cutting. The hardness of the guide pad blank cannot be too high (usually 200 - 240 HB), otherwise the processing cost will be very high (intermittent cutting causes great wear to the tool and low efficiency). Due to the low hardness of the blank and the low roughness of the back of the pad, the wear of the back of the pad increases during operation. Under working conditions with a large load (average specific pressure greater than 1.5 MPa), this will affect the service life and stability of the bearing, and in severe cases, it will damage the main equipment. Summary of the Invention

[0005] The purpose of the present invention is to provide a special fixture for a guide pad of a high-speed radially tilting pad journal bearing to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A special fixture for a guide pad of a high-speed radially tilting pad journal bearing, comprising:

[0007] An outer turntable, rotatably arranged in the horizontal direction;

[0008] A first power assembly for driving the outer turntable to rotate;

[0009] An outer cylinder, arranged at the central position of the outer turntable. There is a radially inwardly arranged annular boss at the lower end of the outer cylinder. The inner diameter of the annular boss is larger than the inner diameter of the guide pad, and the upper end surface of the annular boss forms a support surface for supporting each guide pad;

[0010] The limiting component has five groups and is evenly distributed on the inner wall of the outer cylinder in the circumferential direction, and is used to limit the adjacent guide tiles placed on the annular convex platform in the circumferential direction;

[0011] The clamping component has five groups and is evenly distributed on the inner wall of the outer cylinder in the circumferential direction, and the clamping component and the limiting component are arranged at intervals, and is used to limit each guide tile placed on the annular convex platform in the radial direction;

[0012] And the control part is used to control the operating states of each limiting component and each clamping component to limit the movement of each guide tile located on the annular convex platform in the circumferential and axial directions, or to release the limitation of each guide tile.

[0013] In any of the above technical solutions, further, the limiting component includes:

[0014] The limiting column is in the shape of a cuboid and is arranged on the inner wall of the outer cylinder in the vertical direction; an installation groove is opened in the middle of the limiting column, and the installation groove penetrates through both sides of the limiting column;

[0015] The double-rod hydraulic cylinder is arranged in the installation groove, and its two piston rods both extend out of the installation groove;

[0016] And there are two limiting plates, which are respectively located on both sides of the limiting column and are respectively connected to the two piston rods of the double-rod hydraulic cylinder;

[0017] And the first pressure sensor is arranged at the middle position of the limiting plate and is used to detect the pressure between the limiting plate and the side wall of the guide tile and send the pressure signal to the control part;

[0018] Wherein, the double-rod hydraulic cylinders on each limiting component are all connected to the control part, and the control part is used to control the operating state of the double-rod hydraulic rod to make the limiting plate abut against the side wall of the guide tile or disengage from the side wall of the guide tile.

[0019] In any of the above technical solutions, further, the clamping component includes:

[0020] The clamping hydraulic cylinder is horizontally arranged on the inner wall of the outer cylinder in the radial direction, and its piston rod extends towards the center of the outer cylinder;

[0021] The push plate is arranged on the piston rod of the clamping hydraulic cylinder;

[0022] And the second pressure sensor is arranged on the push plate and is used to detect the pressure exerted by the push plate on the outer wall of the guide tile and send the pressure signal to the control part;

[0023] Wherein, the control part is used to respectively control the operating states of the clamping hydraulic cylinders on each clamping component to respectively move each push plate to clamp or loosen each guide tile.

[0024] In any of the above technical solutions, further, the special fixture further includes a detection and adjustment component for detecting the position of each guide tile after being clamped, and the control unit determines whether each guide tile needs to be repositioned and clamped according to the position of each guide tile.

[0025] In any of the above technical solutions, further, the detection and adjustment component includes:

[0026] An inner turntable, the outer turntable is of an annular structure, the inner turntable is arranged at the center of the outer turntable and is rotatably arranged;

[0027] A second power component for driving the inner turntable to rotate;

[0028] A vertical shaft arranged at the central position of the inner turntable along the vertical direction;

[0029] A horizontal shaft arranged along the horizontal direction, and one end thereof is arranged on the vertical shaft;

[0030] An electric cylinder arranged on the horizontal shaft;

[0031] And a third pressure sensor arranged on the rod part of the electric cylinder for detecting the pressure between the electric cylinder and the inner wall of the guide tile and sending the pressure signal to the control unit;

[0032] Wherein, the second power component, the electric cylinder are connected to the control unit, and the control unit is used to rotate the second power component to make the vertical shaft and the horizontal shaft rotate, and adjust the state of each clamping hydraulic cylinder through the signal detected by the third pressure sensor.

[0033] In any of the above technical solutions, further, the control method of the control unit is specifically as follows:

[0034] S1. Place the cut guide tiles in the outer cylinder in sequence, and then the control unit controls the operation of each double-rod hydraulic cylinder, so that each limiting plate approaches each guide tile. After each first pressure sensor detects a pressure signal and all reach the preset threshold value, the control unit controls each double-rod hydraulic cylinder to stop operating;

[0035] S2. The control unit controls the inner turntable to rotate a certain angle, so that the rod part of the electric cylinder on the horizontal shaft faces the middle position of one of the guide tiles, and then the control unit controls the electric cylinder to operate. The electric cylinder pushes the guide tile towards the inner wall direction of the outer cylinder, so that the distance between the rod part of the electric cylinder and the central axis of the inner turntable is the distance L between the outer circle center O and the inner hole center O' of the finished guide tile plus the inner diameter R when the inner circle of the guide tile is not processed;

[0036] S3. The control unit controls the inner turntable to rotate a certain angle again, so that the rod part of the electric cylinder on the horizontal shaft faces the middle position of the next guide tile, and then, repeat step S2 to adjust the positions of each guide tile in sequence;

[0037] S4. After the position of the last guide shoe is adjusted, the control unit controls each double-rod hydraulic cylinder to run again. After the pressure values detected by each first pressure sensor reach the preset threshold value again, the operation is stopped.

[0038] S5. The control unit controls each clamping hydraulic cylinder to run, so that the push plate on the clamping hydraulic cylinder abuts against the outer wall of the guide shoe with the adjusted position. After the second pressure sensor detects a pressure signal and both reach the preset threshold value, the control unit controls the clamping hydraulic cylinder to stop running.

[0039] S6. The control unit controls the electric cylinder to run. After the third pressure sensor detects a pressure signal, it stops. Subsequently, the control unit controls the inner turntable to rotate one week. Among them, within the time of passing through a guide shoe, if the pressure value F' converted from the pressure signal detected by the third pressure sensor gradually increases from 0 to Fmax, or instantaneously increases from 0 to Fmax first, then gradually decreases to 0, and then gradually increases to Fmax, it indicates that the positions of all guide shoes are adjusted appropriately.

[0040] On the contrary, if in one of the time periods, the pressure value F' instantaneously increases from 0 to less than Fmax first, then gradually decreases to 0, and then gradually increases to greater than Fmax, or the pressure value F' instantaneously increases from 0 to greater than Fmax first, then gradually decreases to 0, and then gradually increases to less than Fmax, it indicates that the guide shoe is skewed. At this time, the control unit controls the double-rod hydraulic cylinder and the clamping hydraulic cylinder to reset. Then, the control unit controls the clamping hydraulic cylinder to run. After the second pressure sensor detects a pressure value, it stops running. The control unit then continues to control the inner turntable to rotate and manually fine-tune the positions on both sides of the guide shoe in turn. After the pressure signal detected by the third pressure sensor returns to normal, the control unit controls the double-rod hydraulic cylinder and the clamping hydraulic cylinder to run until the pressure values detected by the first pressure sensor and the second pressure sensor reach the preset threshold values, and then stops.

[0041] The beneficial effects of the present invention are as follows: The special fixture mainly consists of an outer turntable, an outer cylinder, a limiting component, and a clamping component. After placing the cut guide shoes on the annular protrusion inside the outer cylinder, the limiting component is used to circumferentially limit each guide shoe, and then the clamping component is used to axially limit the guide shoes. Finally, the first power component is used to drive the outer turntable to rotate, so that each guide shoe rotates around the center of the outer turntable. Subsequently, by controlling the tool to move towards the inner wall of the guide shoe and controlling the tool to move in the vertical direction, the inner circle of the whole set of guide shoes can be cut, which is very convenient, effectively improves the processing efficiency, and can ensure the concentricity of the whole set of guide shoes through synchronous processing, and increases the contact area between the guide shoe and the shaft. Description of the Drawings

[0042] Figure 1Schematic diagram of the internal structure of a bearing in the prior art;

[0043] Figure 2 Schematic diagram of the structure of a guide shoe in the prior art;

[0044] Figure 3 Process flow chart in the prior art;

[0045] Figure 4 Schematic diagram of the structure of a complete set of guide shoes in the prior art;

[0046] Figure 5 Process flow chart of the present invention;

[0047] Figure 6 Schematic diagram of the structure of a complete set of guide shoes of the present invention;

[0048] Figure 7 Schematic diagram of the structure of a guide shoe of the present invention;

[0049] Figure 8 Front view structure diagram of the fixture and tool for processing the guide shoe of the present invention;

[0050] Figure 9 Top view structure diagram of the fixture and tool for processing the guide shoe of the present invention;

[0051] Figure 10 Schematic diagram of the structure of a complete set of guide shoes of the present invention assembled in an outer cylinder;

[0052] Figure 11 Is Figure 8 Enlarged view at position C in

[0053] Figure 12 Top view structure diagram of a complete set of guide shoes of the present invention assembled in an outer cylinder;

[0054] Figure 13 Schematic diagram of the structure of the detection and adjustment component of the present invention;

[0055] Figure 14 Control connection block diagram of the control part and each electronic component of the present invention;

[0056] Figure 15 Schematic diagram of the structure of the third pressure sensor of the present invention for detecting the position of the guide shoe;

[0057] The reference numerals in the figure are: a, guide shoe; A, workbench; B, cutting tool; 100, outer turntable; 110, outer ring; 120, inner ring; 200, first power assembly; 210, first motor; 220, transmission gear; 230, gear ring; 300, outer cylinder; 310, annular boss; 400, limiting assembly; 410, limiting post; 420, double-rod hydraulic cylinder; 430, limiting plate; 440, first pressure sensor; 500, clamping assembly; 510, clamping hydraulic cylinder; 520, push plate; 530, second pressure sensor; 600, control unit; 700, detection and adjustment assembly; 710, inner turntable; 720, second power assembly; 721, second motor; 730, vertical shaft; 740, horizontal shaft; 750, electric cylinder; 760, third pressure sensor. Detailed implementation manners

[0058] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0059] In the description of the present application, it should be noted that the terms used herein are only for describing specific implementation manners, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the dimensions of each part shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0060] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually of the same type, and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means that the associated objects before and after are in an "or" relationship.

[0061] Embodiment 1:

[0062] like Figure 5 As shown, this embodiment provides a high-speed radial tilting pad support bearing guide pad processing technology, and the processing steps are as follows:

[0063] a. Blanking of tiles: Check the size and appearance quality of the tiles, and perform flaw detection;

[0064] b. Quenching and tempering treatment: The hardness of the qualified tiles is controlled within HBS320-360 by quenching and tempering;

[0065] c. Rough turning: Use a lathe to process the inner hole of the quenched and tempered tile so that the size and roughness of the inner hole of the tile meet the requirements of alloy casting;

[0066] d. Dehydrogenation annealing: Dehydrogenation annealing is performed on the rough-turned tiles at high temperature;

[0067] e. Tinning: First, clean the tile to remove impurities on its surface to ensure that the surface of the guide tile is clean, then preheat the tile, apply a solvent on the preheated tile surface, and then tin the inner hole surface of the tile;

[0068] f. Casting bearing alloy: centrifugal casting is used to form the babbitt alloy onto the inner hole surface of the tile;

[0069] g. Stress relief heat treatment: Annealing heat treatment is performed on the tile blank cast with Babbitt alloy to release the internal stress formed in the rough processing, alloy casting and other processes;

[0070] h. Rough turning: Use a lathe to process the inner hole and outer circle of the tile blank to reduce the allowance for subsequent processing;

[0071] i. Fine turning of outer circle: Use lathe to fine turn the outer circle of the tile;

[0072] j. Tile cutting: split the tile blank after fine turning in step i, so that it can be cut into guide tiles with designed angles;

[0073] k. Inner hole processing: Use a special fixture to clamp the divided guide bearings, and then mill the inner holes according to the designed dimensions to obtain the finished guide bearings.

[0074] like Figure 6 and Figure 7 As shown, the inner diameter of the finished guide shoe is set to R1, the outer diameter is set to R2, and the distance between the outer circle center O of the guide shoe and the inner hole center O' is set to L; wherein in steps h and i, the outer circle of the tile blank is turned with a point on the axis line of the tile blank as the center, and in step k, the inner hole of the guide shoe is turned with a point deviated from the axis line L of the guide shoe as the center, so that the curvature of the inner circle of the guide shoe is smaller than the curvature of the outer circle.

[0075] In this technical solution, based on the current processing method of guide pads, on the first hand, after pouring Babbitt alloy on the inner wall of the pad blank, a stress relief heat treatment step is added, which can remove a large amount of internal stress inside the pad blank to prevent the workpiece from deforming during subsequent cutting;

[0076] On the second hand, the process steps of the guide pad are adjusted. Specifically, since the outer diameter and inner diameter of the guide pad are not concentric, as Figure 3 and Figure 4 shown, the traditional processing method is to first cut the pad blank, and then clamp the guide pad with a specific tooling to intermittently machine the outer circle of the guide pad. After the outer circle machining is completed, the inner circle is machined. The efficiency is very low, and the surface roughness of the outer circle of the complete set of guide pads is difficult to control, which in turn affects the service performance of the bearing. Therefore, after continuous experimental adjustment, as Figure 5 shown, first rough turn and finish turn the stress relief heat-treated pad blank and then cut it. Since the uncut pad blank is a whole annular structure, machining it first can ensure the accuracy of the machining dimensions of the pad blocks, the surface roughness, and the consistency of the dimensions of the complete set of pad blocks. Moreover, compared with the traditional processing technology, it can also save the tooling for machining the back of the pad, greatly improving the processing efficiency.

[0077] On the third hand, since intermittent cutting causes great wear on the tool, the hardness of the current pad blank cannot be too high, otherwise the processing cost will be significantly increased. Therefore, after adopting the above process in the present invention, by changing the intermittent cutting to continuous cutting, the hardness of the pad blank can be increased in the initial stage, thereby improving the service life of the guide pad.

[0078] Although the above processing technology will cause the thickness of the Babbitt alloy coating on the inner hole of the guide pad to be uneven, making the thickness of the Babbitt alloy coating show a crescent shape, thick in the middle and thin on both sides, generally speaking, by adjusting the process steps, the performance of the finished guide pad is significantly improved, which can effectively control the accuracy of the outer circle of the guide pad and reduce the processing cost.

[0079] In this embodiment, preferably, after finish turning the outer circle of the pad blank in step i, finish grinding the outer circle is carried out.

[0080] In this technical solution, by adding a step of finish grinding the outer circle, the roughness of the outer circle of the finished guide pad is further reduced, the contact stress between the guide pad and the bearing seat is reduced, and thus the wear amount during operation is reduced, improving the service life and feasibility of the entire bearing.

[0081] In this embodiment, preferably, in step j, the pad block cutting is carried out by using a slow wire cutting method.

[0082] In this technical solution, slow wire cutting uses a continuously moving thin metal wire (referred to as the electrode wire) as the electrode to perform pulsed spark discharge on the workpiece to erode the metal and cut it into shape. Through slow wire cutting, the stress during processing can be significantly reduced, thereby reducing the deformation amount after processing.

[0083] Example 2:

[0084] In this example, based on the above processing technology, a special fixture is provided.

[0085] As Figures 8 - 15 shown, in this example, the special fixture includes:

[0086] An outer turntable 100, which is rotatably arranged on the working platform in the horizontal direction;

[0087] A first power assembly 200, which is used to drive the outer turntable 100 to rotate;

[0088] An outer cylinder 300, which is arranged at the central position of the outer turntable 100. There is a radially inwardly arranged annular boss 310 at the lower end of the outer cylinder 300. The inner diameter of the annular boss 310 is larger than the inner diameter of the guide pad. The upper end surface of the annular boss 310 forms a support surface for supporting each guide pad;

[0089] A limiting assembly 400, which has five groups and is evenly distributed on the inner wall of the outer cylinder 300 in the circumferential direction, and is used to limit the adjacent guide pads placed on the annular boss 310 in the circumferential direction;

[0090] A clamping assembly 500, which has five groups and is evenly distributed on the inner wall of the outer cylinder 300 in the circumferential direction, and the clamping assembly 500 and the limiting assembly 400 are arranged at intervals, and is used to limit each guide pad placed on the annular boss 310 in the radial direction;

[0091] And a control unit 600, which is used to control the operating states of each limiting assembly 400 and each clamping assembly 500 to limit the movement of each guide pad located on the annular boss 310 in the circumferential and axial directions, or to release the restriction of each guide pad.

[0092] In this technical solution, for the machining of the inner circle of the guide pad, the current existing machining method can only be carried out individually, and a specific tooling fixture is also required to clamp the guide pad, which is very inconvenient. Moreover, it is difficult to accurately control the inner circle accuracy of the assembled guide pads. Therefore, a fixture that can be applied to the machining of the inner circles of different models of guide pads is proposed.

[0093] Specifically, the special fixture mainly consists of an outer turntable 100, an outer cylinder 300, a limiting component 400, and a clamping component 500. After placing the cut guide pads on the annular boss 310 inside the outer cylinder 300, the circumferential position of each guide pad is limited by the limiting component 400, and then the axial position of the guide pads is limited by the clamping component 500. Finally, the first power component 200 drives the outer turntable 100 to rotate, so that each guide pad rotates around the center of the outer turntable 100. Subsequently, by controlling the movement of the cutting tool towards the inner wall of the guide pad and controlling the movement of the cutting tool in the vertical direction, the inner circle of the entire set of guide pads can be cut, which is very convenient, effectively improving the processing efficiency. Moreover, through synchronous processing, the concentricity of the entire set of guide pads can be guaranteed, and the contact area between the guide pad and the shaft can be increased.

[0094] As Figure 8 and Figure 9 shown, for the first power component 200, the gear transmission method can be adopted. Specifically, the first power component 200 includes:

[0095] A first motor 210, which is vertically arranged below the workbench and is located on the side of the outer turntable 100; a transmission gear 220, which is arranged on the output shaft of the first motor 210; a toothed ring 230, which is arranged on the side wall of the outer turntable 100; wherein, the toothed ring 230 is meshed with the transmission gear 220; by driving the transmission gear 220 to rotate through the first motor 210, the toothed ring 230 and the turntable meshed with it are driven to rotate, which is very convenient. The first motor 210 can adopt a servo motor.

[0096] Embodiment 3:

[0097] This embodiment provides a special fixture based on the guide pads of a high-speed radially tilting pad journal bearing. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0098] As Figure 8 , Figure 10 and Figure 11 shown, in this embodiment, the limiting component 400 includes:

[0099] A limiting column 410, which is in the shape of a cuboid and is vertically arranged on the inner wall of the outer cylinder 300; an installation groove is opened in the middle of the limiting column 410, and the installation groove penetrates both sides of the limiting column 410;

[0100] A double-rod hydraulic cylinder 420, which is arranged in the installation groove, and its two piston rods both extend out of the installation groove;

[0101] And a limiting plate 430, which has two pieces, are respectively located on both sides of the limiting column 410, and are respectively connected to the two piston rods of the double-rod hydraulic cylinder 420;

[0102] And a first pressure sensor 440, which is arranged at the middle position of the limit plate 430, is used to detect the pressure between the limit plate 430 and the side wall of the guide pad, and send the pressure signal to the control unit 600;

[0103] Among them, the double-rod hydraulic cylinders 420 on each limiting component 400 are all connected to the control unit 600. The control unit 600 is used to control the operating state of the double-rod hydraulic rod, so that the limit plate 430 abuts against the side wall of the guide pad or disengages from the side wall of the guide pad.

[0104] In this technical solution, the limiting component 400 is used for circumferentially limiting the guide pads. Generally, a set of guide pads has 4-5 pieces. Therefore, the limiting components 400 are also set to the same number of groups and are evenly distributed on the inner wall of the outer cylinder 300 along the circumferential direction. After the guide pads are placed on the annular boss 310 at intervals, the control unit 600 is first used to start each double-rod hydraulic cylinder 420, so that each limit plate 430 first abuts against the side wall of the guide pad respectively, and then abuts tightly against the side wall of the guide pad; thus realizing the circumferential limitation of the guide pads.

[0105] In this embodiment, the clamping component 500 includes:

[0106] A clamping hydraulic cylinder 510, which is horizontally arranged on the inner wall of the outer cylinder 300 along the radial direction, and its piston rod extends towards the center of the outer cylinder 300;

[0107] A push plate 520, which is arranged on the piston rod of the clamping hydraulic cylinder 510;

[0108] And a second pressure sensor 530, which is arranged on the push plate 520, is used to detect the pressure exerted by the push plate 520 on the outer wall of the guide pad, and send the pressure signal to the control unit 600;

[0109] Among them, the control unit 600 is used to respectively control the operating state of the clamping hydraulic cylinders 510 on each clamping component 500, so as to respectively move each push plate 520 to clamp or loosen each guide pad.

[0110] In this technical solution, the clamping component 500 is used for axially limiting the guide pads. For this purpose, a hydraulic method can also be adopted. By setting the clamping hydraulic cylinder 510 to push the push plate 520 to move, so that the push plate 520 pushes and abuts tightly against the outer wall of the guide pad, realizing the axial limitation of the guide pad.

[0111] Embodiment 4:

[0112] This embodiment provides a special fixture for a guide pad of a high-speed radially tilting pad journal bearing. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0113] Such as Figure 8 、Figure 12 and Figure 13 As shown in Figure 13 , in this embodiment, the special fixture further includes a detection and adjustment assembly 700 for detecting the position of each guide shoe after being clamped, and the control unit 600 determines whether each guide shoe needs to be repositioned and clamped according to the position of each guide shoe.

[0114] In this technical solution, after the guide shoe is clamped under the combined action of the limit assembly 400 and the clamping assembly 500, it is necessary to detect the position of the guide shoe to ensure that the concentricity of the whole set of guide shoes remains consistent after being processed, reducing errors.

[0115] In this embodiment, preferably, the detection and adjustment assembly 700 includes:

[0116] An inner turntable 710, the outer turntable 100 is of a ring structure, and the inner turntable 710 is arranged at the center of the outer turntable 100 and is rotatably arranged;

[0117] A second power assembly 720 for driving the inner turntable 710 to rotate;

[0118] A vertical shaft 730 arranged at the central position of the inner turntable 710 in the vertical direction;

[0119] A horizontal shaft 740 arranged in the horizontal direction, and one end of it is arranged on the vertical shaft 730;

[0120] An electric cylinder 750 arranged on the horizontal shaft 740;

[0121] And a third pressure sensor 760 arranged on the rod part of the electric cylinder 750 for detecting the pressure between the electric cylinder 750 and the inner wall of the guide shoe, and sending the pressure signal to the control unit 600;

[0122] Among them, the second power assembly 720, the electric cylinder 750 are connected to the control unit 600, and the control unit 600 is used to rotate the second power assembly, so that the vertical shaft 730 and the horizontal shaft 740 rotate, and adjust the state of each clamping hydraulic cylinder 510 through the signal detected by the third pressure sensor 760.

[0123] Specifically, the second power assembly 720 is mainly composed of a second motor 721. The second motor 721 is arranged under the workbench and is rotationally connected to the rotating shaft on the inner turntable 710 through a coupling.

[0124] Such as Figure 8 and Figure 13As shown, regarding the outer turntable 100, it is divided into an outer ring 110 and an inner ring 120. The outer ring 110 and the inner ring 120 are connected by a number of circumferentially distributed connecting plates. The inner ring 120 is rotatably arranged on the workbench through a vertically arranged hollow shaft. The hollow shaft is connected to the inner ring 120 through a bearing. The inner turntable 710 is arranged directly above the inner ring 120 and covers the central hole of the inner ring 120. Regarding the waste chips after being cut by the tool, they can be directly discharged downward through the slot holes between the outer ring 110 and the inner ring 120.

[0125] Regarding the detection and adjustment assembly 700, on the one hand, in the initial stage, the distance between the inner turntable 710 center of the guide shoe center tool can be controlled by the electric cylinder 750. After controlling this distance, the double-rod hydraulic cylinder 420 is used to circumferentially limit the guide shoe, and the clamping hydraulic cylinder 510 is used to axially limit the guide shoe. On the other hand, through the rotation of the inner turntable 710 and the action of the third pressure sensor 760, the detection of the position of the guide shoe can be realized. The principle is that after the guide shoe is cut, its inner circle needs to be eccentrically processed so that the outer circle and the inner circle of the finished guide shoe are not concentric. That is to say, for the guide shoe clamped by the special fixture, the distance from its center to the center of the outer turntable 100 is greater than the distance from its two sides to the center of the outer turntable 100.

[0126] Therefore, as Figures 14 - 15 shown, the control method of the control unit 600 can be specifically as follows:

[0127] S1. Place the cut guide shoes in the outer cylinder 300 in sequence in step j. Subsequently, the control unit 600 controls the operation of each double-rod hydraulic cylinder 420 so that each limiting plate 430 approaches each guide shoe. After each first pressure sensor 440 detects a pressure signal and all reach the preset threshold value, the control unit 600 controls each double-rod hydraulic cylinder 420 to stop operating;

[0128] S2. The control unit 600 controls the inner turntable 710 to rotate by a certain angle so that the rod part of the electric cylinder 750 on the cross shaft 740 faces the middle position of one of the guide shoes. Then the control unit 600 controls the electric cylinder 750 to operate. The electric cylinder 750 pushes the guide shoe to approach the inner wall direction of the outer cylinder 300, so that the distance from the rod part of the electric cylinder 750 to the central axis of the inner turntable 710 is the distance L between the outer circle center O and the inner hole center O' of the finished guide shoe plus the inner diameter R when the guide shoe has not been processed for the inner circle, and then resets;

[0129] S3. The control unit 600 controls the inner turntable 710 to rotate by a certain angle again so that the rod part of the electric cylinder 750 on the cross shaft 740 faces the middle position of the next guide shoe. Subsequently, repeat step S2 to adjust the positions of each guide shoe in sequence;

[0130] S4. After the positions of all the guide shoes up to the last one are adjusted, the control unit 600 controls each double-rod hydraulic cylinder 420 to operate again. After the pressure values detected by each first pressure sensor 440 reach the preset threshold value again, the operation is stopped.

[0131] S5. The control unit 600 controls each clamping hydraulic cylinder 510 to operate, so that the push plate 520 on the clamping hydraulic cylinder 510 abuts against the outer wall of the guide shoe with the adjusted position. After the second pressure sensor 530 detects a pressure signal and both reach the preset threshold value, the control unit 600 controls the clamping hydraulic cylinder 510 to stop operating.

[0132] S6. The control unit 600 controls the electric cylinder 750 to operate. After the third pressure sensor 760 detects a pressure signal, it stops. Subsequently, the control unit 600 controls the inner turntable 710 to rotate one week. Among them, within the time of passing through a guide shoe, if the pressure value F' converted from the pressure signal detected by the third pressure sensor 760 gradually increases from 0 to Fmax, or instantaneously increases from 0 to Fmax first, then gradually decreases to 0, and then gradually increases to Fmax, it indicates that the positions of all the guide shoes are adjusted properly.

[0133] On the contrary, if in one of the time periods, the pressure value F' instantaneously increases from 0 to less than Fmax first, then gradually decreases to 0, and then gradually increases to greater than Fmax, or the pressure value F' instantaneously increases from 0 to greater than Fmax first, then gradually decreases to 0, and then gradually increases to less than Fmax, it indicates that the guide shoe is skewed. At this time, the control unit 600 controls the double-rod hydraulic cylinder 420 and the clamping hydraulic cylinder 510 to reset. Then, the control unit 600 controls the clamping hydraulic cylinder 510 to operate. After the second pressure sensor 530 detects a pressure value, the operation is stopped. The control unit 600 then continues to control the inner turntable 710 to rotate, and manually fine-tunes the positions on both sides of the guide shoe in turn. After the pressure signal detected by the third pressure sensor 760 becomes normal, the control unit 600 controls the double-rod hydraulic cylinder 420 and the clamping hydraulic cylinder 510 to operate until the pressure values detected by the first pressure sensor 440 and the second pressure sensor 530 both reach the preset threshold value, and then the operation stops.

[0134] Regarding the control unit 600 to control multiple double-rod hydraulic cylinders 420 and clamping hydraulic cylinders 510, it can be realized by using multiple three-position four-way electromagnetic reversing valves arranged in parallel. The most important inventive point of the present invention is the detection and adjustment assembly 700. Through the detection and adjustment assembly 700, the machining of the inner circle of the whole set of guide shoes and accurate positioning can be realized.

[0135] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A special fixture based on the guide pad of a high-speed radially tilting pad journal bearing, characterized in that, the special fixture includes: an outer turntable (100), rotatably arranged in the horizontal direction; a first power assembly (200) for driving the outer turntable (100) to rotate; an outer cylinder (300), arranged at the central position of the outer turntable (100), with a radially inwardly arranged annular boss (310) at the lower end of the outer cylinder (300), the inner diameter of the annular boss (310) being greater than the inner diameter of the guide pad, and the upper end surface of the annular boss (310) forming a support surface for supporting each guide pad; a limiting assembly (400), having five groups, and evenly distributed along the circumferential direction on the inner wall of the outer cylinder (300) for circumferentially limiting adjacent guide pads placed on the annular boss (310); a clamping assembly (500), having five groups, and evenly distributed along the circumferential direction on the inner wall of the outer cylinder (300), and the clamping assembly (500) and the limiting assembly (400) are arranged at intervals for radially limiting each guide pad placed on the annular boss (310); and a control unit (600) for controlling the operating states of each limiting assembly (400) and each clamping assembly (500) to limit the circumferential and axial movement of each guide pad located on the annular boss (310), or to release the limitation of each guide pad; the limiting assembly (400) includes: a limiting post (410), in the shape of a cuboid, and vertically arranged on the inner wall of the outer cylinder (300); an installation groove is provided in the middle of the limiting post (410), and the installation groove penetrates both sides of the limiting post (410); a double-rod hydraulic cylinder (420), arranged in the installation groove, and both of its piston rods extend out of the installation groove; and two limiting plates (430), respectively located on both sides of the limiting post (410), and respectively connected to the two piston rods of the double-rod hydraulic cylinder (420); and a first pressure sensor (440), arranged at the middle position of the limiting plate (430) for detecting the pressure between the limiting plate (430) and the side wall of the guide pad, and sending a pressure signal to the control unit (600); wherein, the double-rod hydraulic cylinders (420) on each limiting assembly (400) are all connected to the control unit (600), and the control unit (600) is used to control the operating state of the double-rod hydraulic rod to make the limiting plate (430) abut against the side wall of the guide pad or disengage from the side wall of the guide pad.

2. The special fixture based on the guide pad of a high-speed radially tilting pad journal bearing according to claim 1, characterized in that, the clamping assembly (500) includes: a clamping hydraulic cylinder (510), horizontally arranged in the radial direction on the inner wall of the outer cylinder (300), and its piston rod extends towards the center of the outer cylinder (300); a push plate (520), arranged on the piston rod of the clamping hydraulic cylinder (510); and a second pressure sensor (530) disposed on the push plate (520) for detecting the pressure exerted by the push plate (520) on the outer wall of the guide pad and sending a pressure signal to the control unit (600); wherein the control unit (600) is configured to separately control the operating states of the clamping hydraulic cylinders (510) on each of the clamping assemblies (500) to separately move each of the push plates (520) to clamp or release each guide pad.

3. A special fixture for a guide pad of a high-speed radially tilting pad journal bearing according to claim 2, characterized in that, the special fixture further includes a detection and adjustment assembly (700) for detecting the positions of the guide pads after being clamped, and the control unit (600) determines whether each guide pad needs to be repositioned and clamped according to the positions of the guide pads.

4. A special fixture for a guide pad of a high-speed radially tilting pad journal bearing according to claim 3, characterized in that, the detection and adjustment assembly (700) includes: an inner turntable (710), the outer turntable (100) is a ring structure, and the inner turntable (710) is disposed at the center of the outer turntable (100) and is rotatably arranged; a second power assembly (720) for driving the inner turntable (710) to rotate; a vertical shaft (730) disposed at the central position of the inner turntable (710) in the vertical direction; a horizontal shaft (740) disposed in the horizontal direction, and one end thereof is disposed on the vertical shaft (730); a cylinder (750) disposed on the horizontal shaft (740); and a third pressure sensor (760) disposed on the rod portion of the cylinder (750) for detecting the pressure between the cylinder (750) and the inner wall of the guide pad and sending a pressure signal to the control unit (600); wherein the second power assembly (720), the cylinder (750) are connected to the control unit (600), and the control unit (600) rotates the second power assembly to rotate the vertical shaft (730) and the horizontal shaft (740), and adjusts the states of the clamping hydraulic cylinders (510) according to the signals detected by the third pressure sensor (760).

5. A special fixture for a guide pad of a high-speed radially tilting pad journal bearing according to claim 4, characterized in that, the control method of the control unit (600) is specifically as follows: S1. Place the cut guide pads into the outer cylinder (300) in sequence, and then the control unit (600) controls the operation of each double-rod hydraulic cylinder (420) to make each limit plate (430) approach each guide pad. After each first pressure sensor (440) detects a pressure signal and reaches a preset threshold value, the control unit (600) controls each double-rod hydraulic cylinder (420) to stop operating; S2. The control unit (600) controls the inner turntable (710) to rotate by a certain angle so that the rod part of the electric cylinder (750) on the horizontal axis (740) faces the middle position of one of the guide pads. Then, the control unit (600) controls the electric cylinder (750) to operate. The electric cylinder (750) pushes the guide pad towards the inner wall of the outer cylinder (300), so that the distance between the rod part of the electric cylinder (750) and the central axis of the inner turntable (710) is the distance L between the center O of the outer circle of the finished guide pad and the center O' of the inner hole plus the inner diameter R of the guide pad when its inner circle is not processed; S3. The control unit (600) controls the inner turntable (710) to rotate by a certain angle again so that the rod part of the electric cylinder (750) on the horizontal axis (740) faces the middle position of the next guide pad. Subsequently, step S2 is repeated to adjust the positions of the guide pads in sequence; S4. After the position of the last guide pad is adjusted, the control unit (600) controls each double-rod hydraulic cylinder (420) to operate again. After the pressure values detected by each first pressure sensor (440) reach the preset threshold value again, the operation stops; S5. The control unit (600) controls each clamping hydraulic cylinder (510) to operate so that the push plate (520) on the clamping hydraulic cylinder (510) abuts against the outer wall of the guide pad with the adjusted position. After the second pressure sensor (530) detects a pressure signal and all reach the preset threshold value, the control unit (600) controls the clamping hydraulic cylinder (510) to stop operating; S6. The control unit (600) controls the electric cylinder (750) to operate. After the third pressure sensor (760) detects a pressure signal, it stops. Subsequently, the control unit (600) controls the inner turntable (710) to rotate one week. Among them, within the time passing through one guide pad, if the pressure value F' converted from the pressure signal detected by the third pressure sensor (760) increases gradually from 0 to Fmax, or instantaneously increases from 0 to Fmax first, then gradually decreases to 0, and then gradually increases to Fmax, it indicates that the positions of all guide pads are adjusted properly; On the contrary, if in one of the time periods, the pressure value F' instantaneously increases from 0 to less than Fmax first, then gradually decreases to 0, and then gradually increases to greater than Fmax, or the pressure value F' instantaneously increases from 0 to greater than Fmax first, then gradually decreases to 0, and then gradually increases to less than Fmax, it indicates that the guide pad is skewed. At this time, the control unit (600) controls the double-rod hydraulic cylinder (420) and the clamping hydraulic cylinder (510) to reset. Then, the control unit (600) controls the clamping hydraulic cylinder (510) to operate. After the second pressure sensor (530) detects a pressure value, it stops operating. The control unit (600) then continues to control the inner turntable (710) to rotate and manually fine-tune the positions on both sides of the guide pad in sequence. After the pressure signal detected by the third pressure sensor (760) becomes normal, the control unit (600) controls the double-rod hydraulic cylinder (420) and the clamping hydraulic cylinder (510) to operate until the pressure values detected by the first pressure sensor (440) and the second pressure sensor (530) both reach the preset threshold value, and then stops.

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