A two-stage bushing positioning and pressing device and its usage method

Abstract

The present invention belongs to the technical field of mechanical structures, and discloses a two-stage bushing positioning and press-fitting device and a usage method, which includes: hexagon socket head cap screws, fixed seats, slotted cheese head set screws, cylindrical helical compression springs, steel balls, plugs, angular pins, outer pressure plates, outer pressure heads, inner pressure plates, plugs, inner pressure heads, nuts, split washers, bases, screw rods, capable of press-fitting two-stage bushings simultaneously, improving the efficiency and accuracy of bushing press-fitting.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical structures, and particularly relates to a two-stage bushing positioning and pressing device and a usage method thereof. Background Art

[0002] The two-stage bushing with an installation angular orientation is divided into upper and lower stages. The upper stage is a shoulder-shaped special-shaped bushing a with a positioning hole, and the lower stage is a non-shoulder special-shaped bushing b. The structures of the two-stage bushings are as follows Figure 1 shown. When assembling the bushing, the positioning hole of the upper-stage bushing a should be aligned with the positioning hole on the base c, and at the same time, the serrated parts between the upper and lower-stage bushings should not interfere with each other during assembly.

[0003] The structure of a commonly used bushing positioning and pressing device is shown in Figure 2 , where d is the base, e is the pressing plate, f is the nut, g is the stud, h is the washer, and i is the nut. The nut f, stud g, washer h, and nut i are common connecting structure parts, and the base d and the pressing plate e are the main working parts. Before pressing the bushing, the parts are placed on the base d and positioned by the rabbet on the base d. When pressing the bushing, the pressing plate e applies uniform force for pressing. After pressing is completed, the device is disassembled.

[0004] The main problem existing in the structure of the commonly used bushing positioning and pressing device is that when there is a positioning relationship between the bushing and the base, and when there is a certain angular relationship between the two-stage bushings, it is impossible to press the two-stage bushings simultaneously in one go while ensuring compliance. It is necessary to align the angular orientation and press in the lower-stage bushing first, then press in the upper-stage bushing, and then adjust again to ensure the positioning relationship between the upper-stage bushing and the base. The operation is complex and difficult, and it is easy to cause unqualified pressing. Summary of the Invention

[0005] The purpose of the present invention: To provide a two-stage bushing positioning and pressing device and a usage method thereof, which can press the two-stage bushings simultaneously, improving the efficiency and accuracy of bushing pressing.

[0006] To achieve the above purpose, the present invention is implemented by adopting the following technical solutions.

[0007] In the first aspect,

[0008] The present invention provides a two-stage bushing positioning and pressing device, which includes: hexagon socket head cap screw 1, fixed seat 2, slotted cheese head set screw 3, cylindrical helical compression spring 4, steel ball 5, plug 6, angular pin 7, outer pressing plate 8, outer pressing head 9, inner pressing plate 10, plug 11, inner pressing head 12, nut 13, split washer 14, base 15, screw rod 16;

[0009] The plug 11 is located on the outer pressure head 9. The inner pressure head 12 is located at the center of the outer pressure head 9 and is threadedly connected to the screw 16 through the through hole on the inner pressure plate 10. The screw 16 is connected to the nut 13 and the split washer 14 through threads. The split washer 14 is attached to the end face of the base 15. The nut 13 is located under the split washer 14. The outer pressure plate 8 is placed under the outer pressure head 9. The outer pressure plate 8, the inner pressure plate 10, and the fixed seat 2 are connected to each other through rabbet fits. The fixed seat 2 is connected to the inner pressure plate 10 by socket head cap screws 1. The plug 6 is assembled on the side of the fixed seat 2 by interference fit. The spring mechanism composed of the steel ball 5, the cylindrical helical compression spring 4, and the slotted cheese head set screw 3 is placed on the side of the fixed seat 2. The steel ball 5 is located on the outside, the cylindrical helical compression spring 4 is located in the middle, and the slotted cheese head set screw 3 is located on the inside. The angular pin 7 is assembled on the lower end face of the outer pressure plate 8 by interference fit. The base 15 is located under the part as a support platform.

[0010] Further, before the two-stage bushing is press-fitted, first install the part base on the rabbet of the device base 15 and lay the part flat and fix it. The plug 6 and the cylindrical helical compression spring 4 are placed in the fixed seat 2. Before the press-fitting, connect the inner diameter of the lower-stage bushing to the outer diameter of the fixed seat 2. The plug 6 and the cylindrical helical compression spring 4 provide pressure to increase friction for fixing the lower-stage bushing. The inner pressure plate 10 is placed on the fixed seat 2 to provide pressure for the press-fitting of the lower-stage bushing. One end of the angular pin 7 is connected to the outer pressure plate 8, and the other end is connected to the positioning holes of the upper-stage bushing and the base to ensure the installation and positioning requirements of the upper-stage bushing. The outer pressure head 9 is placed on the outer pressure plate 8 to provide pressure for the press-fitting of the upper-stage bushing.

[0011] Further, after the device is assembled, connect the upper-stage bushing to the fixed seat 2 and position it through the angular pin 7. The upper end face of the upper-stage bushing is in contact with the end face of the outer pressure plate 8. After adjusting the angle of the lower-stage bushing relative to the upper-stage bushing, connect the lower-stage bushing to the fixed seat 2 and lock and fix the position through the plug 6 and the cylindrical helical compression spring 4. At this time, the two-stage bushings are integrated. After being positioned through the angular pin 7, the two-stage bushings can be press-fitted onto the part.

[0012] Further, the position degrees of the positioning holes on the outer pressure plate 8, the upper-stage bushing, and the part are the same. The positioning holes on the outer pressure plate 8 are connected to the positioning holes of the upper-stage bushing and the part through the angular pin 7.

[0013] Further, the plug 6, the slotted cheese head set screw 3, the cylindrical helical compression spring 4, and the steel ball 5 form a telescopic mechanism to increase the friction between the lower-stage bushing and the fixed seat 2 and fix the lower-stage bushing on the fixed seat 2.

[0014] The screw 16, the split washer 14, the nut 13, and the inner pressure head 12 form a press-fitting structure. By tightening the nut 13, pressure is applied to the inner pressure plate 10 for press-fitting the lower-stage bushing.

[0015] Further, the outer pressing plate 8 has a stepped structure, and when the lower bushing is pressed with force, the outer pressing plate can drive the upper bushing to be pressed.

[0016] Further, the plug 11 and the outer pressing head 9 together form an outer pressing plate pressing structure to apply pressure to the outer pressing plate.

[0017] In the second aspect,

[0018] The present invention provides a method for using a two-stage bushing positioning and pressing device as described in the first aspect, and the method includes:

[0019] Before bushing pressing: Assemble the inner hexagon socket head screw 1, the fixed seat 2, the slotted flat end set screw 3, the cylindrical helical compression spring 4, the steel ball 5, the plug 6, the angular pin 7, the outer pressing plate 8, the outer pressing head 9, the inner pressing plate 10, the inner pressing head 12, and the screw rod 16. At this time, the steel ball 5 is in a protruding state under the action of the cylindrical helical compression spring 4; the upper bushing and the lower bushing are subjected to cooling and heat preservation treatment, and are installed on the fixed seat 2 through the guidance of the fixed seat 2 and the positioning of the angular pin 7. When installing, ensure the relative position relationship between the upper bushing and the lower bushing. At this time, the cylindrical helical compression spring 4 contracts and applies a tightening force to the bushing through the steel ball 5 to fix the two-stage bushing on the device.

[0020] Further, the method further includes:

[0021] During bushing pressing: Install the part base on the device base 15, fix it after ensuring that the part is placed stably, position and connect the assembled device with the positioning holes on the part through the angular pin 7 to ensure that the position of the positioning hole on the upper bushing is correct; manually press the bushing into a certain depth, then install the split washer 14 and the nut 13, and apply pressure to the inner pressing plate 10 by tightening the nut 13 to press the lower bushing, and at the same time, the inner pressing plate 10 transfers pressure to the outer pressing plate 8 through the end face to press the upper bushing; press the lower bushing to the bottom of the inner hole of the part, and after the two are closely fitted, stop tightening the nut 13, combine the plug 11 and the outer pressing head 9 into an outer pressing plate pressing mechanism, and apply pressure to the outer pressing plate 8 through this mechanism to perform secondary pressing on the upper bushing to ensure that the end face of the upper bushing is closely fitted with the end face of the part. After maintaining the pressure for a period of time, release the pressure and loosen the nut 13. At this time, the pressing of the two-stage bushing is completed.

[0022] In the pressing process of the two-stage bushing positioning and pressing device with positioning holes provided by the technical solution of the present invention, a structure of guiding and connecting through positioning holes and positioning pins is adopted, which can ensure the position accuracy of the positioning holes after the bushing is installed and improve the assembly qualification rate. This device uses a guiding and positioning plus locking mechanism, which can ensure the position relationship between the two-stage bushings during assembly. At the same time, the two-stage bushings can be pressed at one time, replacing the traditional two-step pressing process, which can save a large amount of time for pressing and adjusting the position of the bushings and improve the assembly efficiency. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of an existing two - stage bushing with positioning holes for aviation use;

[0024] Figure 2 It is a schematic structural diagram of an existing bushing positioning and press - fitting device;

[0025] Figure 3 It is a schematic structural diagram of a two - stage bushing positioning and press - fitting device with positioning holes according to an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the combined structure before press - fitting of the device according to an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the installation position of the press - fitted bushing according to an embodiment of the present invention;

[0028] Among them, 1 - hexagon socket head cap screw, 2 - fixed seat, 3 - slotted fillister head set screw, 4 - cylindrical compression spring, 5 - steel ball, 6 - plug, 7 - angular pin, 8 - outer pressure plate, 9 - outer pressure head, 10 - inner pressure plate, 11 - plug, 12 - inner pressure head, 13 - nut, 14 - split washer, 15 - base, 16 - screw rod. Detailed Description of the Invention

[0029] The technical solution of the present invention will be described in detail below with reference to the drawings.

[0030] Embodiment 1

[0031] The embodiment of the present invention provides a two - stage bushing positioning and press - fitting device with positioning holes, as shown in Figure 3 , and the components include: hexagon socket head cap screw 1, fixed seat 2, slotted fillister head set screw 3, cylindrical helical compression spring 4, steel ball 5, plug 6, angular pin 7, outer pressure plate 8, outer pressure head 9, inner pressure plate 10, plug 11, inner pressure head 12, nut 13, split washer 14, base 15, screw rod 16.

[0032] The plug 11 is located on the outer pressure head 9. The inner pressure head 12 is located at the center of the outer pressure head 9 and is connected to the screw 16 through the through hole on the inner pressure plate 10 by threads. The screw 16 is connected to the nut 13 and the split washer 14 by threads. The split washer 14 is attached to the end face of the base 15. The nut 13 is located under the split washer 14. The outer pressure plate 8 is placed under the outer pressure head 9. The outer pressure plate 8, the inner pressure plate 10, and the fixed seat 2 are connected to each other by rabbet fits. The fixed seat 2 is connected to the inner pressure plate 10 by socket head cap screws 1. The plug 6 is assembled on the side of the fixed seat 2 by interference fit. The spring mechanism composed of the steel ball 5, the cylindrical helical compression spring 4, and the slotted cheese head set screw 3 is placed on the side of the fixed seat 2. The steel ball 5 is located on the outside, the cylindrical helical compression spring 4 is located in the middle, and the slotted cheese head set screw 3 is located on the inside. The angular pin 7 is assembled on the lower end face of the outer pressure plate 8 by interference fit. The base 15 is located under the part as a support platform.

[0033] The core components include the fixed seat 2, the cylindrical helical compression spring 4, the plug 6, the angular pin 7, the outer pressure plate 8, the outer pressure head 9, the inner pressure plate 10, the inner pressure head 12, and the base 15. Before the bushing is press-fitted, first install the part base on the rabbet of the base 15 and lay the part flat and fix it. The plug 6 and the cylindrical helical compression spring 4 are placed in the fixed seat 2. Before press-fitting, connect the inner diameter of the lower-level bushing to the outer diameter of the fixed seat 2. The plug 6 and the cylindrical helical compression spring 4 provide pressure to increase friction for fixing the lower-level bushing. The inner pressure plate 10 is placed on the fixed seat 2 to provide pressure for press-fitting the lower-level bushing. One end of the angular pin 7 is connected to the outer pressure plate 8, and the other end is connected to the positioning holes of the upper-level bushing and the base positioning holes to ensure the installation and positioning requirements of the upper-level bushing. The outer pressure head 9 is placed on the outer pressure plate 8 to provide pressure for press-fitting the upper-level bushing. During operation, when the device components are Figure 4 After being combined, connect the upper-level bushing to the fixed seat 2 and position it through the angular pin 7, and then the upper end face is tightly attached to the end face of the outer pressure plate 8. After the angular adjustment of the upper-level bushing is completed for the lower-level bushing, after connecting to the fixed seat 2, lock and fix the position through the plug 6 and the spring 4. At this time, the two-level bushings can be regarded as one body. After being positioned through the angular pin 7, the bushing can be press-fitted onto the part.

[0034] Specifically, the position degrees of the positioning holes on the outer pressure plate 8, the upper-level bushing, and the part are the same. Connect the positioning holes of the outer pressure plate 8, the upper-level bushing, and the part through the angular pin 7 to ensure the correct position of the positioning holes after the upper-level bushing is press-fitted.

[0035] Specifically, after the two-level bushings are guided and connected in series through the fixed seat 2, pull the inner and outer pressure plates by the pull rod to perform press-fitting simultaneously.

[0036] Specifically, the plug 6, the slotted cheese head set screw 3, the cylindrical helical compression spring 4, and the steel ball 5 form a telescopic mechanism to increase the friction between the lower-level bushing and the fixed seat 2 and fix the lower-level bushing on the fixed seat 2.

[0037] Specifically, the screw 16, the split washer 14, the nut 13 and the inner pressure head 12 form a press-fitting structure. By tightening the nut 13, pressure is applied to the inner pressure plate 10 for press-fitting the lower-level bushing.

[0038] Specifically, the outer pressure plate 8 is a stepped structure. When applying force to press-fit the lower-level bushing, it can drive the outer pressure plate to press-fit the upper-level bushing, realizing the simultaneous press-fitting of two levels of bushings.

[0039] Specifically, the plug 11 and the outer pressure head 9 together form an outer pressure plate press-fitting structure, applying pressure to the outer pressure plate to ensure that the upper-level bushing is compacted.

[0040] Specifically, there are certain requirements for the perpendicularity and parallelism of the base 15's stop and end face parts to the bottom surface, ensuring that the base parts can be placed stably.

[0041] Specifically, the base 15 is connected by a welding structure, and the pillar material is selected as a standard steel pipe material, which can save the manufacturing cost of the base and improve the stability of the base.

[0042] Embodiment 2

[0043] The embodiment of the present invention also provides a usage method of a two-level bushing positioning press-fitting device, including:

[0044] Before bushing press-fitting: Before use, first assemble the inner hexagon socket head screw 1, the fixed seat 2, the slotted flat end set screw 3, the cylindrical compression spring 4, the steel ball 5, the plug 6, the angular pin 7, the outer pressure plate 8, the outer pressure head 9, the inner pressure plate 10, the inner pressure head 12, and the screw 16 as Figure 4 shown. At this time, the steel ball 5 is in a protruding state under the action of the spring 4. After the upper and lower-level bushings are subjected to cooling and heat preservation treatment, the upper and lower-level bushings are installed on the fixed seat 2 through the guidance of the fixed seat 2 and the positioning of the angular pin 7. When installing, ensure the relative position relationship of the upper and lower-level bushings, as Figure 5 shown. At this time, the spring 4 contracts and applies a tightening force to the bushing through the steel ball 5, fixing the two-level bushings on the device.

[0045] Bushing press-fitting process: Install the part base on base 15, fix it after ensuring stable placement, position and connect the assembled device to the positioning holes on the part through angular pins 7 to ensure the correct position of the positioning holes on the upper-level bushing. Manually press the bushing into a certain depth, then install the split washer 14 and nut 13. Apply pressure to the inner pressing plate 10 by tightening the nut 13 to press-fit the lower-level bushing. At the same time, the inner pressing plate 10 transfers pressure to the outer pressing plate 8 through the end face to press-fit the upper-level bushing, achieving the effect of press-fitting two levels of bushings simultaneously. Press-fit the lower-level bushing to the bottom of the inner hole of the part. After ensuring tight fit between the two, stop tightening the nut 13. Combine the plug 11 and the outer pressure head 9 to form an outer pressing plate press-fitting mechanism. Apply pressure to the outer pressing plate 8 through this mechanism to perform secondary press-fitting on the upper-level bushing, ensuring tight fit between the end face of the upper-level bushing and the end face of the part. After maintaining the pressure for a period of time, release the pressure and loosen the nut 13. At this time, the press-fitting of the two levels of bushings is completed.

[0046] In the press-fitting process of a two-level bushing positioning press-fitting device with positioning holes provided by the technical solution of the present invention, a structure of guiding connection using positioning holes and positioning pins is adopted, which can ensure the position accuracy of the positioning holes after the bushing is installed and improve the assembly qualification rate. This device uses a guiding positioning plus locking mechanism, which can ensure the positional relationship between the two levels of bushings during assembly. At the same time, it can press-fit two levels of bushings at one time, replacing the traditional two-step press-fitting process, saving a large amount of time for press-fitting and adjusting the position of the bushings, and improving the assembly efficiency.

Claims

1. A two-stage bushing positioning and press-fitting device, characterized in that, The device includes: hexagon socket head cap screw (1), fixed seat (2), slotted set screw with flat point (3), cylindrical helical compression spring (4), steel ball (5), plug one (6), angular pin (7), outer pressure plate (8), outer pressure head (9), inner pressure plate (10), plug two (11), inner pressure head (12), nut (13), split washer (14), base (15), screw rod (16); Plug two (11) is located on the outer pressure head (9), the inner pressure head (12) is located at the center of the outer pressure head (9) and is threadedly connected to the screw rod (16) through the through hole on the inner pressure plate (10). The screw rod (16) is connected to the nut (13) and the split washer (14) through threads. The split washer (14) is attached to the end face of the base (15), the nut (13) is located under the split washer (14), the outer pressure plate (8) is placed under the outer pressure head (9). The outer pressure plate (8), inner pressure plate (10), and fixed seat (2) are interconnected through rabbet fits. The fixed seat (2) is connected to the inner pressure plate (10) by hexagon socket head cap screws (1). Plug one (6) is assembled on the side of the fixed seat (2) through interference fit. The spring mechanism composed of the steel ball (5), cylindrical helical compression spring (4), and slotted set screw with flat point (3) is placed on the side of the fixed seat (2). The steel ball (5) is located on the outside, the cylindrical helical compression spring (4) is located in the middle, and the slotted set screw with flat point (3) is located on the inside. The angular pin (7) is assembled on the lower end face of the outer pressure plate (8) through interference fit. The base (15) is located under the part as a support platform; Plug one (6), the slotted set screw with flat point (3), the cylindrical helical compression spring (4), and the steel ball (5) form a telescopic mechanism to increase the friction between the lower bushing and the fixed seat (2) and fix the lower bushing on the fixed seat (2); The screw rod (16), split washer (14), nut (13), and inner pressure head (12) form a press-fitting structure. By tightening the nut (13), pressure is applied to the inner pressure plate (10) for press-fitting the lower bushing; The outer pressure plate (8) is of a stepped structure and can drive the outer pressure plate to press-fit the upper bushing when applying force to press-fit the lower bushing.

2. A two-stage bushing positioning and press-fitting device according to claim 1, characterized in that Before press-fitting the two-stage bushing, first install the part base on the rabbet of the device base (15) and lay the part flat and fix it. Plug one (6) and the cylindrical helical compression spring (4) are placed in the fixed seat (2). Before press-fitting, connect the inner diameter of the lower bushing to the outer diameter of the fixed seat (2). Plug one (6) and the cylindrical helical compression spring (4) provide pressure to increase friction for fixing the lower bushing; The inner pressure plate (10) is placed on the fixed seat (2) to provide pressure for press-fitting the lower bushing; One end of the angular pin (7) is connected to the outer pressure plate (8), and the other end is connected to the positioning holes of the upper bushing and the base positioning holes to ensure the installation and positioning requirements of the upper bushing; The outer pressure head (9) is placed on the outer pressure plate (8) to provide pressure for press-fitting the upper bushing.

3. A two-stage bushing positioning and press-fitting device according to claim 2, characterized in that, After assembling the device, connect the upper bushing to the fixed seat (2) and position it with the angular pin (7). Then, the upper end face of the upper bushing is pressed against the end face of the outer pressure plate (8). After adjusting the angle of the lower bushing relative to the upper bushing, connect the lower bushing to the fixed seat (2) and lock and fix the position with the plug one (6) and the cylindrical helical compression spring (4). At this time, the two-stage bushings are integrated. After positioning with the angular pin (7), the two-stage bushings can be press-fitted onto the part.

4. A two-stage bushing positioning and press-fitting device according to claim 3, characterized in that The position degrees of the positioning holes on the outer pressure plate (8), the upper bushing, and the part are the same, and the positioning holes on the outer pressure plate (8) are connected to the positioning holes on the upper bushing and the part through the angular pin (7).

5. A two-stage bushing positioning and press-fitting device according to claim 1, characterized in that The plug two (11) and the outer pressure head (9) jointly form an outer pressure plate press-fitting structure to apply pressure to the outer pressure plate.

6. A method for using a two-stage bushing positioning and press-fitting device as described in any one of claims 1-5, characterized in that, The usage method includes: Before bushing press-fitting: Assemble the hexagon socket head cap screw (1), fixed seat (2), slotted cheese head set screw (3), cylindrical helical compression spring (4), steel ball (5), plug one (6), angular pin (7), outer pressure plate (8), outer pressure head (9), inner pressure plate (10), inner pressure head (12), and screw rod (16). At this time, the steel ball (5) is in a protruding state under the action of the cylindrical helical compression spring (4); perform cooling and heat preservation treatment on the upper bushing and the lower bushing, and install them on the fixed seat (2) through the guidance of the fixed seat (2) and the positioning of the angular pin (7). When installing, ensure the relative position relationship between the upper bushing and the lower bushing. At this time, the cylindrical helical compression spring (4) contracts and applies a tightening force to the bushing through the steel ball (5) to fix the two-stage bushings on the device.

7. The method of using a two-stage bushing positioning and press-fitting device according to claim 6, characterized in that, The usage method further includes: During bushing press-fitting: Install the part base on the device base (15), fix it after ensuring the part is placed stably, position and connect the assembled device to the positioning holes on the part through the angular pin (7) to ensure the correct position of the positioning holes on the upper bushing; manually press the bushing into a certain depth, then install the split washer (14) and nut (13), and apply pressure to the lower bushing by tightening the nut (13) to apply pressure to the inner pressure plate (10). At the same time, the inner pressure plate (10) transfers pressure to the outer pressure plate (8) through the end face to press-fit the upper bushing; press-fit the lower bushing to the bottom of the inner hole of the part. After they are closely fitted, stop tightening the nut (13), combine the plug two (11) and the outer pressure head (9) into an outer pressure plate press-fitting mechanism, and apply pressure to the outer pressure plate (8) through this mechanism to perform secondary press-fitting on the upper bushing to ensure that the end face of the upper bushing is closely fitted to the end face of the part. After maintaining the pressure for a period of time, release the pressure and loosen the nut (13). At this time, the press-fitting of the two-stage bushings is completed.

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