Automatic bushing pressing tool for bushing installation

Abstract

The utility model discloses an automatic bushing pressing tool for bushing installation. The automatic bushing pressing tool comprises a power device and a bushing static pressure assembly. A to-be-installed lining sleeves a small-diameter cylinder of a static pressure head in the lining static pressure assembly, a notch is formed in the end face of the to-be-installed lining, the to-be-installed lining is connected with one end of a fixed pull rod, the other end of the fixed pull rod penetrates through a T-shaped lining and then is connected with one end of an inner sleeve, the other end of the inner sleeve is connected with an external thread of a power device, and a driving mandrel of the power device extends into the inner sleeve. The T-shaped lining is installed in a bottom hole of a part and arranged opposite to a lining arranged on a small-diameter cylinder of the static pressure head in a sleeved mode, a piston capable of moving in the axial direction is arranged in the inner sleeve, the outer sleeve is arranged outside the inner sleeve in a sleeved mode and fixedly connected with the piston, and the end of the outer sleeve extends into a through hole of the T-shaped lining. According to the technical scheme provided by the utility model, the problems that the bush is easy to damage, distort and deform and the maximum cold shrinkage installation time specified in the process specification is difficult to meet in the existing cold shrinkage installation mode of the bush are solved.

Description

Technical Field

[0001] This utility model relates to, but is not limited to, the field of bushing cold shrink installation technology, and particularly to an automated bushing pressing tool for bushing installation. Background Technology

[0002] In aircraft assembly, the cold shrink installation of large-diameter bushings is mainly concentrated at the intersection hole. This part is a key part of the assembly and connection of large aircraft components, and its accuracy directly affects the interchangeability and coordination between aircraft components and the overall assembly quality of the aircraft.

[0003] The current method for cold-shrinking bushing installation is the traditional manual installation, which involves rotating the handle of a manual pressing tool to press the bushing into the bottom hole of the component. This operation is time-consuming and labor-intensive, and is prone to quality problems such as bushing damage, twisting and deformation. Moreover, it is difficult to meet the maximum cold-shrinking installation time of 30 seconds specified in the process specifications. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems. This utility model provides an automated pressing tool for bushing installation, which solves the problem that the existing cold shrink installation method of bushing is time-consuming and labor-intensive, and is prone to quality problems such as bushing damage, twisting and deformation, as well as the difficulty in meeting the maximum cold shrink installation time of 30 seconds specified in the process specifications.

[0005] The technical solution of this utility model: This utility model embodiment provides an automated bushing pressing tool for bushing installation, including: a power unit 7 and a bushing static pressure assembly;

[0006] The bushing hydrostatic assembly includes: a hydrostatic head 1, a fixed tie rod 2, a T-shaped bushing 3, a piston 4, an outer sleeve 5, and an inner sleeve 6. The hydrostatic head 1 is configured as a stepped column structure, with a small-diameter inner column for fitting the bushing to be installed. A slot is provided on the end face of the small-diameter column for connecting with a spline at one end of the fixed tie rod 2. The other end of the fixed tie rod 2 passes through the T-shaped bushing 3 and is fixedly connected to one end of the inner sleeve 6. The internal threaded hole at the other end of the inner sleeve 6 is screwed and fixed to the external thread 8 of the power device 7, so that the drive spindle 9 of the power device 7 extends into the inner sleeve 6.

[0007] The T-shaped bushing 3 is configured as a stepped column structure with a stepped through hole inside, which is used to install the small-diameter column into the bottom hole of the part and is positioned opposite to the bushing fitted on the small-diameter column of the static pressure head 1. One end of the outer sleeve 5 is provided with an end boss. The inner sleeve 6 has a piston 4 that can move axially. The outer sleeve 5 is fitted entirely outside the inner sleeve 6 and is fixedly connected to the piston 4. The end boss of the outer sleeve 5 is embedded in the through hole on the end face of the large-diameter column in the T-shaped bushing 3.

[0008] Optionally, in the automated bushing press tool for bushing installation as described above,

[0009] The automated pressing tool, by pressing the switch of the power device 7, drives the mandrel 9 to extend. Under the action of axial force, it pushes the piston 4 to move the outer sleeve 5 and the T-shaped bushing 3 toward the static pressure head 1 with the bushing. This causes the end face of the part on the T-shaped bushing 3 to abut against the end face of the bushing on the static pressure head 1, and after the stepped end face of the T-shaped bushing 3 abuts against the end face of the part, the distance between the outer sleeve 5 and the T-shaped bushing 3 and the static pressure head 1 is shortened under the action of clamping force. The fixed pull rod 2 pulls the static pressure head 1 with the bushing into the bottom hole of the part, completing the installation of the bushing.

[0010] Optionally, in the automated bushing press tool for bushing installation as described above,

[0011] The outer diameter of the small-diameter column in the static pressure head 1 matches the size of the bushing to be installed.

[0012] The outer diameter of the small-diameter cylinder in the T-type bushing 3 matches the bottom hole size of the part, and the inner diameter of one side of the end face of the large-diameter cylinder matches the end boss of the outer sleeve 5, so that the end boss of the outer sleeve 5 can be inserted into the through hole of the end face of the large-diameter cylinder with clearance fit.

[0013] Optionally, in the automated bushing press tool for bushing installation as described above, the bushing hydrostatic assembly further includes: screw 10;

[0014] The inner sleeve 6 has multiple elongated slots axially formed on its cylinder wall. The piston 4 is embedded in two symmetrically arranged elongated slots and can move axially within the elongated slots.

[0015] Two through holes are symmetrically arranged on the wall of the outer sleeve 5. After the entire outer sleeve 5 is fitted onto the outside of the inner sleeve 6, screws 10 are passed through the through holes and fixedly connected to the internal threads at both ends of the piston 4 to connect the piston 4 and the outer sleeve 5 into an integral structure.

[0016] Optionally, in the automated bushing press tool for bushing installation as described above,

[0017] The piston 4 is installed through the two elongated slots symmetrically arranged on the inner sleeve 6, with both ends of the piston 4 extending out of the two elongated slots; after the outer sleeve 5 is fitted over the inner sleeve 6, the outer sleeve 5 and the piston 4 are fixedly connected by screws 10, so that the piston 4 is perpendicular to the axis of the outer sleeve 5 and the inner sleeve 6.

[0018] Optionally, in the automated bushing press tool for bushing installation as described above,

[0019] The length of the elongated slot on the inner sleeve 6 is matched with the working stroke of the bushing static pressure assembly, and the working stroke of the bushing static pressure assembly is determined by the thickness of the bushing to be installed.

[0020] The beneficial effects of this utility model are as follows: This utility model provides an automated pressing tool for bushing installation. A power unit 7 provides axial power to the bushing static pressure assembly. Based on the cooperation between the drive spindle 9 of the power unit 7 and the piston 4 in the inner sleeve 6 of the static pressure assembly, the drive spindle 9, under the action of axial force, pushes the piston 4 to move the movable outer sleeve 5 and the movable T-shaped bushing 3 towards the static pressure head 1 containing the bushing. Under the action of clamping force, the distance between the movable outer sleeve 5 and the movable T-shaped bushing 3 and the static pressure head 1 is shortened. Then, the static pressure head with the bushing is pulled into the bottom hole of the component, achieving rapid bushing installation. Compared with the prior art, the automated pressing tool provided by this utility model has the following beneficial effects:

[0021] First, this automated bushing press tool is simple and easy to operate. It supplies power to the bushing static pressure assembly through the power unit 7. When in use, you only need to press the on / off switch to complete the static pressure installation of the bushing. It is a convenient bushing installation device.

[0022] Secondly, it replaces the original traditional manual bushing pressing tools, avoiding the quality problems such as bushing damage, twisting and deformation caused by manual bushing installation, and also improves processing efficiency and product quality, while reducing the labor intensity of workers.

[0023] This automated press-fit tool is particularly suitable for the cold shrink installation of large-diameter bushings. Furthermore, this tool can be extended to other types of components for press-fitting of bushings and bearings, ensuring press-fitting quality during component production while improving processing efficiency. Based on a hydraulically driven tool design concept, it can be further applied to more large-diameter bushing installation fields, enhancing the processing level of parts. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0025] Figure 1 A schematic diagram of an automated bushing press tool for bushing installation provided for an embodiment of this utility model;

[0026] Figure 2 for Figure 1 The illustrated embodiment provides a schematic diagram of the power unit in an automated bushing press tool for bushing installation.

[0027] Figure 3 for Figure 1 A cross-sectional view of an automated bushing press tool for bushing installation provided in the illustrated embodiment.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Static pressure head; 2. Fixed tie rod; 3. T-type bushing; 4. Piston; 5. Outer sleeve; 6. Inner sleeve; 7. Power unit; 8. External thread; 9. Drive spindle; 10. Screw. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0031] The background section has already explained the necessity of cold-shrink installation of large-aperture bushings in aircraft assembly, and the impact of their installation accuracy on the interchangeability and coordination between aircraft components and the overall assembly quality of the aircraft. Existing cold-shrink installation methods for bushings are time-consuming and labor-intensive due to manual installation, and are prone to quality problems such as bushing damage, twisting, and deformation. Furthermore, large-aperture bushings cannot simultaneously meet the process specifications' requirements for bushing installation methods (spinning or hydrostatic pressing), a maximum cold-shrink installation time of 30 seconds, and the avoidance of impact forces during bushing installation.

[0032] In addition, during actual operation, due to the large aperture and product structure limitations, the mandrel used for auxiliary installation is not cooled, which can easily damage the metal matrix of the bushing or parts and affect product quality. Therefore, it is urgent to design an automated pressing tool to meet the technical requirements in the process specifications and improve product quality and processing efficiency.

[0033] To address the aforementioned problems and process requirements, this utility model provides an automated pressing tool for large-diameter bushings. Using this tool for cold shrink installation of bushings effectively improves the first-pass yield of products.

[0034] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they will not be described again in some embodiments.

[0035] Figure 1 This is an overall schematic diagram of an automated bushing pressing tool for bushing installation provided by an embodiment of the present invention. Figure 2 for Figure 1 The illustrated embodiment provides a schematic diagram of the power unit in an automated bushing press tool for bushing installation. Figure 3 for Figure 1 A cross-sectional view of an automated bushing press tool for bushing installation provided in the illustrated embodiment. (Refer to...) Figures 1 to 3 As shown in the figure, the automated bushing pressing tool for bushing installation provided in this embodiment of the present invention includes two parts: a power unit 7 and a bushing static pressure assembly. The bushing static pressure assembly includes: a static pressure head 1, a fixed tie rod 2, a T-shaped bushing 3, a piston 4, an outer sleeve 5, and an inner sleeve 6.

[0036] like Figure 1 and Figure 2 The bushing hydrostatic assembly of the automated bushing tool shown includes a hydrostatic head 1, a fixed tie rod 2, a T-shaped bushing 3, a piston 4, an outer sleeve 5, and an inner sleeve 6. The hydrostatic head 1 is configured as a stepped cylindrical structure, with a small-diameter inner cylinder used to fit the bushing to be installed. A slot is provided on the end face of the small-diameter cylinder for spline connection with one end of the fixed tie rod 2. The other end of the fixed tie rod 2 passes through the T-shaped bushing 3 and is fixedly connected to one end of the inner sleeve 6. The internal threaded hole at the other end of the inner sleeve 6 is screwed and fixed to the external thread 8 of the power device 7, so that the drive spindle 9 of the power device 7 extends into the inner sleeve 6.

[0037] It should be noted that the spline structure at one end of the fixed pull rod 2 can both limit the static pressure head 1 and facilitate the disassembly of the static pressure head 1 and the T-shaped bushing 3. Furthermore, the automated pressing tool provided in this embodiment is particularly suitable for bushing installation in component bottom holes with a diameter greater than 30mm.

[0038] In this embodiment of the utility model, the T-shaped bushing 3 is also configured as a stepped column structure with a stepped through hole inside, which is used to install the small-diameter column in the bottom hole of the part and is positioned opposite to the bushing fitted on the small-diameter column of the static pressure head 1. One end of the outer sleeve 5 is provided with an end boss, and the inner sleeve 6 has a piston 4 that can move axially. The outer sleeve 5 is fitted entirely outside the inner sleeve 6 and is fixedly connected to the piston 4. The end boss of the outer sleeve 5 is embedded in the through hole on the end face of the large-diameter column in the T-shaped bushing 3.

[0039] In this embodiment of the utility model, the fit relationship of each structure is as follows: the outer diameter of the small-diameter column in the static pressure head 1 matches the size of the bushing to be installed; in addition, the outer diameter of the small-diameter column in the T-shaped bushing 3 matches the size of the bottom hole of the part, and the inner diameter of one side of the end face of its large-diameter column matches the end boss of the outer sleeve 5, which is used for the clearance fit of the end boss of the outer sleeve 5 into the through hole of the end face of the large-diameter column.

[0040] The automated pressing tool for bushing installation provided in this embodiment of the utility model is used as follows: By pressing the switch of the power device 7, the drive spindle 9 is extended. Under the action of axial force, the piston 4 is pushed to move the outer sleeve 5 and the T-shaped bushing 3 toward the end of the static pressure head 1 with the bushing. This causes the end face of the part on the T-shaped bushing 3 to abut against the end face of the bushing on the static pressure head 1, and the stepped end face of the T-shaped bushing 3 to abut against the end face of the part. Under the action of clamping force, the distance between the outer sleeve 5 and the T-shaped bushing 3 and the static pressure head 1 becomes shorter. The fixed pull rod 2 pulls the static pressure head 1 with the bushing into the bottom hole of the part, thus completing the installation of the bushing.

[0041] It should be noted that the working stroke of the hydrostatic component depends on the thickness of the mounting bushing, and the working feed speed is determined based on the working feed stroke and the time limit.

[0042] In one implementation of this utility model embodiment, such as Figure 1 and Figure 3 As shown, the bushing hydrostatic assembly also includes: screw 10.

[0043] In this implementation, the inner sleeve 6 has multiple elongated slots axially formed on its wall. The piston 4 is embedded in two symmetrically arranged elongated slots and can move axially within them. The outer sleeve 5 has two symmetrically arranged through holes on its wall. After being fitted onto the inner sleeve 6, screws 10 are passed through the through holes and fixedly connected to both ends of the piston 4, thus connecting the piston 4 and the outer sleeve 5 into a single structure. In a specific implementation, the piston 4 has internally threaded holes at both ends for screwing and fixing with the screws 10. The piston 4 is perpendicular to the axes of the outer sleeve 5 and the inner sleeve 6.

[0044] In the actual installation structure, the piston 4 is installed through the two elongated slots symmetrically arranged on the inner sleeve 6, that is, the piston 4 intersects with the elongated slots of the inner sleeve 6, and the two ends of the piston 4 extend out of the two elongated slots. After the outer sleeve 5 is put on, the piston 4 also intersects with the outer sleeve 5. The outer sleeve 5 and the piston 4 are fixed by screw 10 thread connection.

[0045] It should be noted that the length of the elongated slot on the inner sleeve 6 is matched with the working stroke of the bushing static pressure assembly. As explained above, the working stroke of the bushing static pressure assembly is determined by the thickness of the bushing to be installed.

[0046] The automated pressing tool for bushing installation provided in this embodiment of the invention provides axial power to the bushing static pressure assembly via a power unit 7. Based on the cooperation between the drive spindle 9 of the power unit 7 and the piston 4 in the inner sleeve 6 of the static pressure assembly, the drive spindle 9, under the action of axial force, pushes the piston 4 to move the movable outer sleeve 5 and the movable T-shaped bushing 3 towards the static pressure head 1 containing the bushing. Under the action of clamping force, the distance between the movable outer sleeve 5 and the movable T-shaped bushing 3 and the static pressure head 1 is shortened. Then, the static pressure head with the bushing is pulled into the bottom hole of the component, realizing the rapid installation of the bushing. Compared with the prior art, the automated pressing tool provided by this invention has the following beneficial effects:

[0047] First, this automated bushing press tool is simple and easy to operate. It supplies power to the bushing static pressure assembly through the power unit 7. When in use, you only need to press the on / off switch to complete the static pressure installation of the bushing. It is a convenient bushing installation device.

[0048] Secondly, it replaces the original traditional manual bushing pressing tools, avoiding the quality problems such as bushing damage, twisting and deformation caused by manual bushing installation, and also improves processing efficiency and product quality, while reducing the labor intensity of workers.

[0049] This automated press-fit tool is particularly suitable for the cold shrink installation of large-diameter bushings. Furthermore, this tool can be extended to other types of components for press-fitting of bushings and bearings, ensuring press-fitting quality during component production while improving processing efficiency. Based on a hydraulically driven tool design concept, it can be further applied to more large-diameter bushing installation fields, enhancing the processing level of parts.

[0050] The following is an illustrative description of how to use the automated bushing pressing tool for bushing installation provided in the embodiments of this utility model.

[0051] See Figures 1 to 3 As shown, the steps for using the automated compression molding tool provided in this embodiment of the present invention are as follows:

[0052] Step 1: Rotate the static pressure head 1 to disassemble it from the fixed tie rod 2;

[0053] Step 2: Place the bushing onto the hydrostatic head 1 and immerse it together in the coolant for cooling to ensure that the bushing installation process specifications are met;

[0054] Step 3: Take out the cooled static pressure head 1 with the bushing, insert it into the fixing pull rod 2 of the automated pressing tool, and fix it by screwing.

[0055] Step 4: Hold the handle of the power unit 7 and press the switch button of the power unit 7. Under the action of axial force, the piston 4 is pushed to move the outer sleeve 5 and the T-shaped bushing 3 toward the static pressure head 1 with the bushing. Under the action of clamping force, the distance between the movable outer sleeve 5 and the movable T-shaped bushing 3 and the static pressure head 1 is shortened. Thus, the static pressure head 1 with the bushing is pulled into the bottom hole of the part by the fixed pull rod 2. The bushing installation is completed.

[0056] Step 5: Release the switch button of the power unit 7, manually rotate the static pressure head 1 and remove it, then remove the remaining automatic compression tool parts to complete the cold shrink installation of the bushing.

[0057] Although the embodiments disclosed in this utility model are as described above, the content is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this utility model, but the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. An automated bushing press tool for bushing installation, characterized in that, include: Power unit (7) and bushing hydrostatic assembly; The bushing hydrostatic assembly includes: a hydrostatic head (1), a fixed tie rod (2), a T-shaped bushing (3), a piston (4), an outer sleeve (5), and an inner sleeve (6); the hydrostatic head (1) is configured as a stepped column structure, with a small-diameter inner column for fitting the bushing to be installed, and a slot is provided on the end face of the small-diameter column for connecting with the spline of one end of the fixed tie rod (2). The other end of the fixed tie rod (2) passes through the T-shaped bushing (3) and is fixedly connected to one end of the inner sleeve (6). The internal thread hole of the other end of the inner sleeve (6) is screwed and fixed to the external thread (8) of the power device (7), so that the drive spindle (9) of the power device (7) extends into the inner sleeve (6); The T-shaped bushing (3) is configured as a stepped column structure with a stepped through hole inside, which is used to install the small-diameter column in the bottom hole of the part and is positioned opposite to the bushing fitted on the small-diameter column of the static pressure head (1). One end of the outer sleeve (5) is provided with an end boss. The inner sleeve (6) has a piston (4) that can move axially. The outer sleeve (5) is fitted entirely outside the inner sleeve (6) and is fixedly connected to the piston (4). The end boss of the outer sleeve (5) is embedded in the through hole of the large-diameter column end face in the T-shaped bushing (3).

2. The automated bushing press tool for bushing installation according to claim 1, characterized in that, The automated pressing tool, by pressing the switch of the power device (7), causes the drive spindle (9) to extend. Under the action of axial force, the piston (4) is pushed to drive the outer sleeve (5) and the T-shaped bushing (3) to move towards the end of the static pressure head (1) with the bushing. This causes the end face of the part on the T-shaped bushing (3) to abut against the end face of the bushing on the static pressure head (1), and after the stepped end face of the T-shaped bushing (3) abuts against the end face of the part, the distance between the outer sleeve (5) and the T-shaped bushing (3) and the static pressure head (1) becomes shorter under the action of clamping force. The fixed pull rod (2) pulls the static pressure head (1) with the bushing into the bottom hole of the part, thus completing the installation of the bushing.

3. The automated bushing press tool for bushing installation according to claim 1, characterized in that, The outer diameter of the small-diameter column in the static pressure head (1) matches the size of the bushing to be installed; The outer diameter of the small-diameter cylinder in the T-type bushing (3) matches the bottom hole size of the part, and the inner diameter of one side of the end face of the large-diameter cylinder matches the end boss of the outer sleeve (5), which is used for the clearance fit of the end boss of the outer sleeve (5) into the through hole of the end face of the large-diameter cylinder.

4. The automated bushing press tool for bushing installation according to claim 1, characterized in that, The bushing hydrostatic assembly further includes: screws (10); The inner sleeve (6) has multiple elongated slots along the axial direction on its cylinder wall. The piston (4) is embedded in two symmetrically arranged elongated slots and can move along the axial direction in the elongated slots. The outer sleeve (5) has two through holes symmetrically arranged on its wall. After the entire sleeve is fitted onto the outside of the inner sleeve (6), screws (10) are passed through the through holes and fixedly connected to the internal threads at both ends of the piston (4) to connect the piston (4) and the outer sleeve (5) into an integral structure.

5. The automated bushing press tool for bushing installation according to claim 4, characterized in that, The piston (4) is installed through the two elongated slots symmetrically arranged on the inner sleeve (6), and both ends of the piston (4) extend out of the two elongated slots. After the outer sleeve (5) is fitted on the outside of the inner sleeve (6), the two ends of the outer sleeve (5) and the piston (4) are fixedly connected by screws (10), so that the piston (4) is perpendicular to the axis of the outer sleeve (5) and the inner sleeve (6).

6. The automated bushing press tool for bushing installation according to claim 4, characterized in that, The length of the elongated slot on the inner sleeve (6) is matched with the working stroke of the bushing static pressure assembly, and the working stroke of the bushing static pressure assembly is determined by the thickness of the bushing to be installed.

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