High-precision digital display hydraulic self-centering bearing assembling device

Abstract

The invention discloses a high-precision digital display hydraulic self-centering bearing assembling device which comprises a base (1), a bearing seat positioning device (2) is assembled in the middle of the base (1), a fixed plate (9) is assembled above the base (1), a driving part is installed on the fixed plate (9), a movable plate (7) is assembled below the fixed plate (9), and a bearing pressing plate (6) is assembled on the bottom face of the movable plate (7). And a telescopic rod (17) of the driving piece drives the movable plate (7) to move up and down. The device is reasonable in design, the assembly precision is improved, and potential quality hazards caused after the bearing is obliquely pressed in are avoided; the operation difficulty and the labor intensity are reduced; a pressure value is automatically recorded, a pressure curve can be observed, and abnormity during bearing assembly can be found in time according to the pressure curve and the pressure value, such as over-tight or over-loose fit between a bearing chamber and a bearing, so that potential quality hazards are eliminated; and during product model changing, frequent replacement of the bearing seat positioning device is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing assembly, and specifically to a high-precision digital-display hydraulic self-centering bearing assembly device. Background Art

[0002] At present, the bearing assembly on the motor assembly line of the EMU is as follows Figure 8 As shown: put the tie rod, insert the bearing seat and the bearing into the tie rod, level the bearing, insert the pressure plate, insert the hollow oil cylinder, manually press the outer ring of the bearing through the bearing pressure plate to pull the bearing into the bearing seat. There are two existing technologies for assembling bearings: one of the existing technologies is to use a copper rod to knock the outer ring of the bearing to assemble the bearing into the bearing chamber of the bearing seat. The disadvantage is that the pressure cannot be measured when the bearing is assembled. Another existing technology is to press the bearing in through a hollow oil cylinder. The disadvantage is that due to the lack of a guide device, the parallelism between the end face of the bearing and the end face of the bearing chamber cannot be guaranteed when the bearing is assembled, which easily causes the bearing to be pressed in at an angle, burying quality risks.

[0003] The current assembly method has the following shortcomings: 1) There are quality risks: Since the holes on the pressure plate are through holes, there is a large gap between the pull rod and the pressure plate. During the press-fitting process, the parallelism between the end face of the bearing and the end face of the bearing seat cannot be guaranteed. The bearing may be pressed in at an angle, causing the insulation layer of the outer ring of the bearing to fall off and fail, resulting in quality risks. 2) High skill requirements for the assembler: Each time, the outer ring of the bearing is knocked with a bakelite stick through visual inspection and touch to ensure that the parallelism between the end face of the bearing and the end face of the bearing seat is within a certain range, which requires high skill from the operator. 3) Low assembly accuracy: The bearing pressure plate has no precise guide. During the press-fitting process, the bearing may tilt, affecting the assembly accuracy. 4) High labor intensity: The outer ring of the bearing and the bearing seat are interference fits. When pressing in, the bearing needs to be pressed in manually, which is labor-intensive. 5) Pressure cannot be measured. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the purpose of the present invention is to provide a high-precision digital display hydraulic self-centering bearing assembly device, which completes the assembly of the bearing by combining three parts: a bearing pressing device, a force measuring device, and an adjustable bearing seat positioning device.

[0005] The present invention is achieved by adopting the following technical solutions: A high-precision digital-display hydraulic self-centering bearing assembly device comprises a base, a bearing seat positioning device is assembled in the middle of the base, a fixed plate is assembled above the base, a driving member is installed on the fixed plate, a movable plate is assembled below the fixed plate, and a bearing pressure plate is assembled on the bottom surface of the movable plate; the telescopic rod of the driving member drives the movable plate to realize up and down movement.

[0006] A force measuring device is further preferably designed, wherein a pressure sensor chamber is fixedly mounted on the upper surface of the movable plate; a pressure sensor and a sensor pressure plate are placed in the inner cavity of the pressure sensor chamber, a through hole is provided in the middle of the upper bottom surface of the inner cavity, and the sensor pressure plate is integrally formed by a connecting stud, a first step and a second step; after the first step of the sensor pressure plate passes through the through hole on the upper bottom surface of the inner cavity, its connecting stud is connected to the threaded hole on the end surface of the telescopic rod by threading, and the second step is clamped in the inner cavity of the pressure sensor chamber; the end surface diameter of the telescopic rod is the same as the diameter of the first step. The height of the first step of the sensor pressure plate is greater than the length of the through hole on the upper bottom surface of the inner cavity. In the free state, a gap is left between the upper surface of the pressure sensor and the lower bottom surface of the sensor pressure plate.

[0007] Further preferably, to ensure the parallelism between the lower plane of the fixing plate and the upper plane of the base, the fixing plate and the base are connected by four precision contour sleeves through four tie rods.

[0008] Further preferably, to ensure that the lower plane of the movable plate always remains parallel to the upper plane of the base during the up and down movement, four self-lubricating guide sleeves are assembled on the fixed plate around the driving member through interference fit, and four guide columns are correspondingly assembled on the movable plate, and the guide columns pass through the self-lubricating guide sleeves through a small clearance fit.

[0009] In order to further preferably realize automatic display of pressure, the pressure sensor chamber is fixedly mounted on the movable plate by screws; a pressure display screen is mounted on the side of the movable plate, and the pressure sensor is connected to the pressure display screen by a wire.

[0010] A further preferred positioning device is designed, wherein the bearing seat positioning device includes a positioning base, a turntable, a slide groove guide pin, and a bearing seat outer clamp / inner support positioning pin; the positioning base is fixedly installed on the upper surface of the base, a turntable is embedded in the middle of the positioning base, a plurality of dovetail grooves are evenly distributed on the outer peripheral annular surface of the positioning base, a T-shaped sliding key is installed in the dovetail groove, the turntable is provided with an Archimedes spiral slide groove matching the T-shaped sliding key, a slide groove guide pin located in the corresponding Archimedes spiral slide groove is installed on the inner side of the T-shaped sliding key, a positioning screw hole is provided in the center of the positioning base, a turntable tightening screw is inserted into the center hole of the turntable and then screwed into the positioning screw hole to achieve positioning; the bearing seat outer clamp / inner support positioning pin is installed on the outer side of the T-shaped sliding key through the pin hole.

[0011] Further preferably, the positioning base is embedded and installed on the base by screws; a knob part is provided in the middle of the turntable, and the knob part is hollow for inserting the turntable clamping screw; and a plurality of pin holes are provided on the T-shaped sliding key.

[0012] Further preferably, the driving member is a cylinder.

[0013] The main design features of the device of the present invention are as follows: First, adjustable bearing seat positioning device: 1. The adjustable bearing seat positioning device drives the pin to adjust the diameter through the spiral groove on the turntable. After the turntable and the positioning base are assembled, they are clearance fit. The turntable can be rotated with a wrench through the hexagonal knob on the upper end, and the guide pin is driven by three Archimedes spiral slide grooves to push the T-type slide key to slide in the dovetail groove of the positioning base (the slide groove guide pin and the T-type slide key are interference fit; the slide groove guide pin and the Archimedes spiral slide groove are clearance fit), so that the three bearing seat outer clamps / inner support positioning pins can be adjusted synchronously within a certain diameter range, through the bearing seat outer clamp / inner support positioning pins to clamp or inner support the outer circle or inner hole of the bearing seat.

[0014] 2. The way to lock the turntable is to adjust it to the required size, and then use an Allen wrench to tighten the turntable screw to lock the turntable and the positioning base to ensure that the turntable will not rotate during use and the positioning size remains unchanged.

[0015] 3. Install the bearing seat outer clamp / inner support positioning pin on the T-type sliding key to achieve both outer clamp and inner support positioning methods.

[0016] 4. By increasing the number of pin holes on the T-type sliding key, the adjustment range is expanded. To expand the adjustment range, three pin holes are processed on each T-type sliding key, and the pin holes and the bearing seat outer clamp / inner support positioning pins are slightly interference fit. The bearing seat outer clamp / inner support positioning pins are matched with different pin holes respectively, and three adjustable ranges of large and small are obtained.

[0017] Second, the method of detecting pressure through a pressure sensor and recording the pressure value and pressure curve: After the first step of the sensor pressure plate passes through the through hole on the upper bottom surface of the inner cavity, its connecting stud is connected to the threaded hole on the end surface of the telescopic rod through a thread. The end surface diameter of the telescopic rod is the same as the diameter of the first step (the outer circular side surface d of the first step), and the outer circular side surface d of the first step is in clearance with the inner circular surface f of the through hole; the height of the first step of the sensor pressure plate (the depth of the outer circular side surface d of the first step) is greater than the length of the through hole on the upper bottom surface of the inner cavity (the inner circular surface f of the through hole). The outer circular side surface b of the second step of the sensor pressure plate is in clearance with the inner cylindrical surface g of the inner cavity of the pressure sensor chamber, that is, the diameter of the outer circular side surface b of the second step is greater than the inner circular surface f of the through hole. Then the second step is clamped in the inner cavity of the pressure sensor chamber, that is, in the non-stressed state, the pressure sensor chamber is hoisted on the second step plane c of the sensor pressure plate (the bottom surface h of the inner cavity is in contact with the second step plane c), and in the free state, there is a gap between the upper plane a of the pressure sensor and the lower plane j of the sensor pressure plate to ensure that the pressure sensor is not subjected to force when the bearing pressure plate under the movable plate is not in contact with the bearing. The first step plane e of the sensor pressure plate is tightly fitted with the end face i of the oil cylinder piston rod through the external thread of the connecting stud and the internal thread of the piston rod, and the sensor pressure plate, the pressure sensor chamber and the piston rod are connected as a whole. The sensor pressure plate can move axially relative to the pressure sensor chamber. The pressure sensor is placed in the cavity of the pressure sensor chamber, and the sensor chamber is connected to the movable plate by screws. In actual application, a break is provided on the side of the cavity of the pressure sensor chamber to facilitate the wire of the pressure sensor to pass through. The wire of the pressure sensor is connected to the pressure display screen. After the pressure sensor is pressurized, the pressure value and pressure curve are displayed on the pressure display screen.

[0018] Compared with the prior art, the advantages of the present invention are: improving assembly accuracy and avoiding quality risks caused by tilted pressing of the bearing; reducing operation difficulty and labor intensity; automatically recording pressure values, observing the pressure curve, and timely discovering abnormalities during bearing assembly based on the pressure curve and pressure values, such as the bearing chamber and the bearing being too tight or too loose, to eliminate quality risks; and avoiding frequent replacement of the bearing seat positioning device when changing products.

[0019] The invention has reasonable design, realizes rapid assembly of the bearing under stable pressure, and has good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 The overall structural schematic diagram of the device of the present invention is shown.

[0023] Figure 2 The working schematic diagram of the device of the present invention is shown.

[0024] Figure 3 A schematic diagram showing the assembly of the adjustable bearing seat positioning device and the base.

[0025] Figure 4 A schematic diagram showing the structure of an adjustable bearing seat positioning device.

[0026] Figure 5 A schematic diagram showing the split structure of the adjustable bearing seat positioning device.

[0027] Figure 6 A schematic diagram showing the split structure of the force measuring device.

[0028] Figure 7 Schematic diagram of the split structure of the force measuring device (viewed from above).

[0029] Figure 8 It shows the pressing process of a certain type of motor bearing.

[0030] In the figure: 1-base, 2-bearing seat positioning device, 3-precision contour sleeve, 4-bearing seat, 5-bearing, 6-bearing pressure plate, 7-movable plate, 8-pressure sensor chamber, 9-fixed plate, 10-pull rod, 11-self-lubricating guide sleeve, 12-guide column, 13-oil cylinder, 14-oil cylinder nozzle, 15-pressure sensor, 16-sensor pressure plate, 17-telescopic rod, 18-pressure display screen, 19-positioning base, 20-turntable, 21-T-type sliding key, 22-screw, 23-turntable clamping screw, 24-Archimedes spiral slide, 25-slide guide pin, 26-pin hole, 27-bearing seat outer clamp / inner support positioning pin, 28-inner cavity, 29-through hole, 30-connecting stud, 31-first step, 32-second step, 33-dovetail groove, 34-positioning screw hole, 35-knob part, 36-nut, 37-slot, 38-fracture; a-upper plane of pressure sensor, b-outer circular side of second step, c-second step plane, d-outer circular side of first step, e-first step plane, f-inner circular surface of through hole, g-inner cylindrical surface of inner cavity, h-bottom surface of inner cavity, i-end face of cylinder piston rod, j-lower plane of sensor pressure plate. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0032] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0034] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] A high-precision digital display hydraulic self-centering bearing assembly device mainly consists of three parts: a bearing pressing device, a force measuring device, and an adjustable bearing seat positioning device.

[0036] Bearing press-fit device Figure 1 , 2 As shown, the oil cylinder 13 is connected to the fixed plate 9 as a whole through threads, and the oil cylinder nozzle 14 on the oil cylinder 13 is connected to the oil supply hose of the hydraulic pump station. The lower end surface of the telescopic rod (oil cylinder piston rod) 17 on the oil cylinder 13 is processed with internal threads. The fixed plate 9 and the base 1 are connected by four precision contour sleeves 3 through four tie rods 10 to ensure the parallelism between the lower plane of the fixed plate 9 and the upper plane of the base 1; the lower end of the tie rod 10 is fixed to the four corners of the base 1, and the upper end is locked by a nut 36 after passing through the precision contour sleeve 3 and the fixed plate 9. The fixed plate 9 is equipped with four brass graphite self-lubricating guide sleeves 11 through interference fit, and the four guide pillars 12 and the movable plate 7 are interference fit to form a whole. At the same time, the guide pillars 12 and the self-lubricating guide sleeves 11 are small clearance fits, which can ensure that the lower plane of the movable plate 7 is always parallel to the upper plane of the base 1 during the up and down movement. The bearing pressing device is driven by an oil cylinder, and the guide pins and sleeves are used to ensure that the end face of the bearing is parallel to the end face of the bearing seat, so as to ensure that the axis center line of the bearing and the axis center line of the bearing chamber always coincide with each other during the bearing pressing process.

[0037] Force measuring device such as Figure 6 , 7As shown: the inner cavity 28 of the pressure sensor chamber 8 is provided with a pressure sensor 15 and a sensor pressure plate 16. A through hole 29 is provided in the middle of the upper bottom surface of the inner cavity 28. The sensor pressure plate 16 is integrally formed by a connecting stud 30, a first step 31 and a second step 32. After the first step 31 of the sensor pressure plate 16 passes through the through hole 29 on the upper bottom surface of the inner cavity 28, its connecting stud 30 is connected to the threaded hole on the end surface of the telescopic rod 17 by threading. The end surface diameter of the telescopic rod 17 is the same as the diameter of the first step 31 (the outer circular side surface d of the first step), and the outer circular side surface d of the first step is in clearance with the inner circular surface f of the through hole; the height of the first step 31 of the sensor pressure plate 16 (the depth of the outer circular side surface d of the first step) is greater than the length of the through hole 29 on the upper bottom surface of the inner cavity 28 (the inner circular surface f of the through hole). The outer circular side surface b of the second step of the sensor pressure plate 16 is in clearance with the inner cylindrical surface g of the inner cavity of the pressure sensor chamber 8, that is, the diameter of the outer circular side surface b of the second step is greater than the inner circular surface f of the through hole 29. The second step 32 is clamped in the inner cavity 28 of the pressure sensor chamber 8, that is, in the non-stressed state, the pressure sensor chamber 8 is hoisted on the second step plane c of the sensor pressure plate 16 (the bottom surface h of the inner cavity is in contact with the second step plane c), and in the free state, there is a 1mm gap between the upper plane a of the pressure sensor and the lower plane j of the sensor pressure plate, ensuring that the pressure sensor 15 is not subjected to stress when the bearing pressure plate 6 under the movable plate 7 is not in contact with the bearing. The first step plane e of the sensor pressure plate 16 and the end face i of the oil cylinder piston rod are tightly connected through the external thread of the connecting stud 30 and the internal thread of the piston rod 17, and the sensor pressure plate 16, the pressure sensor chamber 8, and the piston rod 17 are connected as a whole, and the sensor pressure plate 16 can move axially relative to the pressure sensor chamber 8. The pressure sensor 15 is placed in the cavity of the pressure sensor chamber 8, and the sensor chamber 8 is connected to the movable plate 7 by 6 screws. In actual application, a break 38 is provided on the side of the cavity of the pressure sensor chamber 8 to facilitate the wires of the pressure sensor 15 to pass through. The wires of the pressure sensor 15 are connected to the pressure display screen 18. After the pressure sensor 15 is pressurized, the pressure value and pressure curve are displayed on the pressure display screen 18.

[0038] The intelligent motor production line needs to meet the needs of various types of motor products with different bearing seat sizes. When switching product models, the adjustable bearing seat positioning device can meet the needs of rapid model change of multiple batches and small batches on the intelligent production line.

[0039] Adjustable bearing seat positioning device such as Figure 3 , 45: It is mainly composed of a positioning base 19, a rotating disk 20, a guide pin 25 for a sliding groove, and a positioning pin 27 for an outer clamp / inner support of a bearing seat. The positioning base 19 is embedded in the base 1 through three screws 22. After connection, the upper plane of the positioning base 19 and the upper plane of the T-shaped sliding key 21 are flush with the upper plane of the base 1; at the same time, three slots 37 are also provided on the upper surface of the base 1 for the three T-shaped sliding keys 21, which are used for the placement and sliding of the T-shaped sliding keys 21. A rotating disk 20 is embedded in the middle of the positioning base 19, and the rotating disk 20 and the positioning base 19 are clearance-matched after assembly. Three dovetail grooves 33 are evenly distributed on the outer circumferential surface of the positioning base 19, and a T-shaped sliding key 21 is installed in each dovetail groove 33. The turntable 20 is provided with an Archimedes spiral sliding groove 24 that matches the T-shaped sliding key 21. A sliding groove guide pin 25 located in the corresponding Archimedes spiral sliding groove 24 is installed on the inner side of the T-shaped sliding key 21. The sliding groove guide pin 25 and the T-shaped sliding key 21 are interference fit; the sliding groove guide pin 25 and the Archimedes spiral sliding groove 24 are clearance fit. A positioning screw hole 34 is provided at the center of the positioning base 19. The turntable pressing screw 23 is inserted into the center hole of the turntable 20 and then screwed into the positioning screw hole 34 to achieve positioning; the outer side of the T-shaped sliding key 21 is installed with a bearing seat outer clamp / inner support positioning pin 27 through a pin hole 26. A knob portion 35 is provided in the middle of the turntable 20, and the knob portion 35 is hollow for inserting the turntable pressing screw 23. By turning the outer hexagon of the knob 35 with a wrench, the three Archimedean spiral slide grooves 24 drive the slide groove guide pin 25 to push the T-shaped sliding key 21 to slide in the dovetail groove of the positioning base 19, so that the three bearing seat outer clamp / inner support positioning pins 27 can be adjusted synchronously within a certain diameter range, and the outer circle or inner hole of the bearing seat is clamped or supported by the bearing seat outer clamp / inner support positioning pins 27. After adjusting to the required size, use an inner hexagon wrench to turn the inner hexagon screw 23 to lock the turntable 20 with the positioning base 19 to ensure that the turntable will not rotate during use and ensure that the positioning size remains unchanged. In order to expand the adjustment range, each T-shaped sliding key 21 has three pin holes 26, and the pin holes 26 and the bearing seat outer clamp / inner support positioning pins 27 are a small interference fit.

[0040] like Figure 2As shown: During operation, first adjust the adjustable bearing seat positioning device and lock the turntable 20, place the bearing 5 and the bearing seat 4 on the adjustable bearing seat positioning device 2, and the hydraulic oil of the hydraulic pump station drives the cylinder piston rod 17 to move downward through the cylinder nozzle 14. The cylinder piston rod 17 drives the movable plate 7 and the bearing pressure plate 6 to press the bearing 5 into the bearing chamber of the bearing seat 4. When the movable plate 7 and the bearing pressure plate 6 move downward, the four guide pillars 12 ensure that the lower plane of the bearing pressure plate 6 and the upper plane of the positioning plane base 1 of the bearing seat are always parallel to ensure assembly accuracy. After the bearing pressure plate 6 contacts the bearing 5, the bearing pressure plate 6 continues to move downward. When the lower plane of the sensor pressure plate 16 contacts the upper plane of the pressure sensor 15, the pressure sensor 15 displays the pressure value and pressure curve on the pressure display screen 18 in real time through electrical signals, and automatically transmits and saves them in the computer.

[0041] The device of the present invention has the following advantages: 1) The guide column is precisely guided to improve assembly accuracy and avoid quality risks caused by tilted pressing of the bearing.

[0042] 2) PLC controls the automatic operation of the pump station, reducing the difficulty and intensity of operation.

[0043] 3) Automatically record the pressure value, observe the pressure curve, and promptly detect abnormalities during bearing assembly based on the pressure curve and pressure value, such as the bearing chamber and the bearing being too tight or too loose, to eliminate quality risks.

[0044] 4) Due to the small batch and multi-batch characteristics of the product, when the production line product changes, the bearing seat positioning device does not need to be replaced, only adjusted.

[0045] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A high-precision digital display hydraulic self-centering bearing assembly device, characterized in that: The invention comprises a base (1), a bearing seat positioning device (2) is installed in the middle of the base (1), a fixed plate (9) is installed above the base (1), a driving member is installed on the fixed plate (9), a movable plate (7) is installed below the fixed plate (9), and a bearing pressure plate (6) is installed on the bottom surface of the movable plate (7); the telescopic rod (17) of the driving member drives the movable plate (7) to achieve up and down movement.

2. A high-precision digital display hydraulic self-centering bearing assembly device according to claim 1, characterized in that: A pressure sensor chamber (8) is fixedly mounted on the upper surface of the movable plate (7); a pressure sensor (15) and a sensor pressure plate (16) are placed in the inner cavity (28) of the pressure sensor chamber (8); a through hole (29) is provided in the middle of the upper bottom surface of the inner cavity (28); the sensor pressure plate (16) is integrally formed by a connecting stud (30), a first step (31) and a second step (32); after the first step (31) of the sensor pressure plate (16) passes through the through hole (29) on the upper bottom surface of the inner cavity (28), the connecting stud (30) is connected to the threaded hole on the end surface of the telescopic rod (17) by threading, and the second step (32) is clamped in the inner cavity (28) of the pressure sensor chamber (8); the end surface diameter of the telescopic rod (17) is the same as the diameter of the first step (31).

3. A high-precision digital display hydraulic self-centering bearing assembly device according to claim 2, characterized in that: In a free state, a gap is left between the upper surface of the pressure sensor (15) and the lower bottom surface of the sensor pressure plate (16).

4. A high-precision digital display hydraulic self-centering bearing assembly device according to claim 3, characterized in that: The height of the first step (31) of the sensor pressure plate (16) is greater than the length of the through hole (29) on the bottom surface of the inner cavity (28).

5. The high-precision digital display hydraulic self-centering bearing assembly device according to claim 1, characterized in that: The fixing plate (9) and the base (1) are connected by four precision contour sleeves (3) through four pull rods (10).

6. A high-precision digital display hydraulic self-centering bearing assembly device according to claim 2, characterized in that: Four self-lubricating guide sleeves (11) are assembled on the fixed plate (9) around the driving member through interference fit, and four guide pillars (12) are correspondingly assembled on the movable plate (7), and the guide pillars (12) pass through the self-lubricating guide sleeves (11) through a small clearance fit.

7. A high-precision digital display hydraulic self-centering bearing assembly device according to claim 2, characterized in that: The pressure sensor chamber (8) is fixedly mounted on the movable plate (7) by means of screws (22); a pressure display screen (18) is mounted on the side of the movable plate (7), and the pressure sensor (15) is connected to the pressure display screen (18) by means of a wire.

8. The high-precision digital display hydraulic self-centering bearing assembly device according to claim 1, characterized in that: The bearing seat positioning device (2) comprises a positioning base (19), a rotating disk (20), a slide guide pin (25), and a bearing seat outer clamp / inner support positioning pin (27); The positioning base (19) is fixedly mounted on the upper surface of the base (1), and a turntable (20) is embedded in the middle of the positioning base (19). A plurality of dovetail grooves (33) are evenly distributed on the outer peripheral annular surface of the positioning base (19), and a T-shaped sliding key (21) is installed in the dovetail groove (33). The turntable (20) is provided with an Archimedean spiral sliding groove (24) that cooperates with the T-shaped sliding key (21). A sliding groove guide pin (25) located in the corresponding Archimedean spiral sliding groove (24) is installed on the inner side of the T-shaped sliding key (21). A positioning screw hole (34) is provided in the center of the positioning base (19), and a turntable clamping screw (23) is inserted into the center hole of the turntable (20) and then screwed into the positioning screw hole (34) to achieve positioning; the outer side of the T-shaped sliding key (21) is provided with a bearing seat outer clamp / inner support positioning pin (27) through a pin hole (26).

9. A high-precision digital display hydraulic self-centering bearing assembly device according to claim 8, characterized in that: The positioning base (19) is embedded and installed on the base (1) by means of screws (22); a knob portion (35) is provided in the middle of the turntable (20); the knob portion (35) is hollow and is used to insert a turntable clamping screw (23); and a plurality of pin holes (26) are provided on the T-shaped sliding key (21).

10. The high-precision digital display hydraulic self-centering bearing assembly device according to claim 1, characterized in that: The driving member is an oil cylinder (13).

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