Aluminum alloy bearing bush disassembling device

Abstract

The invention relates to an aluminum alloy bearing bush disassembling device which is mainly used for disassembling aluminum alloy bearing bushes of aircraft accessory casings and engine accessory casing parts. Comprising a fastening nail, a tension spring, an oil passing block, a first pressure spring, a supporting rod, an oil guide rod, a second pressure spring, a first reversing valve, a second reversing valve and a third reversing valve. The self-centering function after the device is installed is achieved by means of the fit clearance between the outer diameter of the oil passing block and the inner diameter of the aluminum alloy bearing bush, meanwhile, a plurality of fastening nails stretch out synchronously according to the hydraulic principle and can be evenly distributed and wedged into the aluminum alloy bearing bush, and the purposes that locking force is equal, and loads borne by all stress points of the bush are balanced are achieved. According to the bushing disassembling device, automatic triggering of two-step operation of bushing locking and bushing pulling-out in the bushing pulling-out process is achieved through the logic relation of a mechanical structure, and efficiency is high.

Description

Technical Field

[0001] The invention relates to an aluminum alloy bearing bushing disassembly device, which is mainly used for disassembling the aluminum alloy bearing bushings of aircraft accessory casings and engine accessory casings. Background Art

[0002] During the operation of aircraft accessory casings and engine accessory casings, aluminum alloy bearing bushings often wear out. When the aircraft accessory casings and engine accessory casings are overhauled, the worn aluminum alloy bearing bushings need to be disassembled so that new bearing bushings can be replaced for assembly and processing.

[0003] At present, there are two methods to decompose aluminum alloy bushings of this type of parts:

[0004] The first method is to use a large-size tap of M32-M90 to tap the upper part of the bushing, and then use a tool of the corresponding specification to screw into the bushing. Then one operator holds the part while the other repeatedly extracts the tool with a lifting hammer. The aluminum alloy bearing bushing is disassembled from the receiver under repeated impact loads.

[0005] The disadvantage of this aluminum alloy bearing bushing disassembly method is that it is an impact load when the bushing is pulled out, and the hammer extraction process cannot ensure vertical disassembly, which can easily cause deformation of the receiver reference surface, high labor intensity for workers, and high cost of large-diameter taps.

[0006] The second method is to use a machining center to mill the aluminum alloy bushing to a thinner state, and then use diagonal pliers to break down the remaining part.

[0007] The disadvantage of this aluminum alloy bushing decomposition method is that it uses a CNC machining center, which requires clamping and alignment each time, and the preparation of CNC programs. At the same time, the milling efficiency is low, and the costs of tools, equipment and energy consumption are high. Summary of the invention

[0008] Purpose of the Invention

[0009] The purpose of the present invention is to provide a disassembly device for the aluminum alloy bearing bushing of a flying engine casing, which has the characteristics of low design and manufacturing cost, simple and labor-saving operation, high precision, and high sleeve extraction efficiency. The disassembly device can be used to easily disassemble the aluminum alloy bearing bushing by a single person without the aid of CNC equipment.

[0010] Technical Solution

[0011] A disassembly device for an aluminum alloy bearing bushing comprises a fixing pin, a tension spring, an oil passage block, a first pressure spring, a support rod, an oil guide rod, a second pressure spring, a first reversing valve, a second reversing valve and a third reversing valve; the oil passage block is provided with an oil circuit a, an oil circuit b and an oil circuit c; the oil circuit b is formed by connecting a straight-through channel and an annular channel, the straight-through channel on one side of the oil circuit b is connected to the second reversing valve, the annular channel on the other side of the oil circuit b is connected to a bushing locking chamber, a tension spring and a fixing pin are provided on the bushing locking chamber, and a first annular groove is provided on the circumference of the fixing pin; one side of the oil circuit a is connected to the third reversing valve, the other side of the oil circuit a is connected to the oil control chamber, the oil control chamber is provided with an oil guide rod and a second pressure spring, the on-off of the oil circuit a is determined by the position of the space where the first annular groove is located, and the second annular groove is provided on the oil guide rod; one side of the oil circuit c is connected to the first reversing valve, the other side of the oil circuit c is connected to the sleeve pulling actuating chamber, the sleeve pulling actuating chamber is provided with a first pressure spring and a support rod, and the on-off of the oil circuit c is determined by the position of the space where the second annular groove is located.

[0012] Furthermore, during operation, the bushing disassembly device is installed on the inner diameter of the bushing and the retaining edge at the bottom of the bushing, and the first reversing valve, the second reversing valve and the third reversing valve are switched to the oil pressure channel at the same time, and the hydraulic oil acts on the fixing pin through the oil circuit b, pushing the fixing pin to move in the direction of the bushing and locking the bushing with the disassembly device, and at the same time, the first annular groove is connected with the oil circuit a, and the hydraulic oil acts on the oil guide rod through the oil circuit a and pushes the oil guide rod to move toward the second pressure spring and compress the second pressure spring, and at the same time, the second annular groove is connected with the oil circuit c, and the hydraulic oil acts on the support rod through the oil circuit c and pushes the support rod to extend in the direction of the casing body, supporting the casing body, thereby pulling the bushing out of the casing body;

[0013] After the bushing is pulled out from the casing body, the first reversing valve is switched to the oil return channel, the support rod is restored to its original position under the action of the first pressure spring, the third reversing valve is switched to the oil return channel, the oil guide rod is restored to its original position under the action of the second pressure spring, the second reversing valve is switched to the oil return channel, and the fixing pin is restored to its original position under the action of the tension spring, thereby allowing the bushing to detach from the disassembly device.

[0014] Furthermore, there are a plurality of bushing locking cavities, which are evenly distributed on the annular channel.

[0015] Furthermore, the support rod is an H-shaped structure.

[0016] Furthermore, a rubber buffer pad is provided on the side of the support rod in contact with the casing body to achieve soft contact between the casing body and the support rod.

[0017] Furthermore, the other side of the oil circuit a is connected to the oil control chamber in a semi-annular structure, which can bypass the sleeve pulling actuation chamber.

[0018] Furthermore, a sealing ring is provided between the support rod and the outer side of the oil passing block to prevent the hydraulic oil in the disassembly device from overflowing from the matching gap between the support rod and the oil passing block.

[0019] Furthermore, a sealing ring is provided between one side of the protruding end of the fixing pin and the outer side of the oil passage block to prevent the hydraulic oil in the disassembly device from overflowing from the matching gap between one side of the protruding end of the fixing pin and the outer side of the oil passage block.

[0020] The beneficial effects of this application are:

[0021] The device realizes the self-centering function after the device is installed by relying on the matching clearance between the outer diameter of the oil-passing block and the inner diameter of the aluminum alloy bearing sleeve, and at the same time, utilizes the hydraulic principle to realize the synchronous extension of multiple fixing pins, which can be evenly wedged into the aluminum alloy bearing sleeve to achieve equal locking force and balanced load on each stress point of the sleeve; the disassembly device realizes the automatic triggering of the two-step operation of sleeve locking and sleeve extraction in the sleeve extraction process through the logical relationship of the mechanical structure, and has high efficiency; at the same time, by pressing the reversing valve, the semi-automatic loosening of the extracted bearing sleeve can be realized, and the sleeve can be removed and the device reset, reducing a large number of complex operations; using this disassembly device to disassemble the aluminum alloy bearing sleeve of the aircraft engine casing is simple and labor-saving for workers to operate, and the disassembly efficiency is very high, which can ensure that the sleeve is vertically extracted from the part body, so as to achieve the accuracy of the part reference surface without damaging it. The design of the disassembly device is simple in structure and low in manufacturing cost. The disassembly device can be used to easily disassemble the aluminum alloy bearing sleeve without the help of CNC equipment by a single person, and the disassembly device can be widely used in the process of disassembling aluminum alloy bearing sleeves in the repair of casing parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Aluminum alloy bearing bushing disassembly device structure principle diagram

[0023] in:

[0024] Tightening pin-1, tension spring-2, oil passage block-3, first pressure spring-4, support rod-5, oil guide rod-6, second pressure spring-7, first reversing valve-8, second reversing valve-9, third reversing valve-10. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail in combination with the embodiment of the present invention. In the example, the same or similar reference numerals throughout represent the same or similar originals or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below by reference are exemplary and intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention. The following is a detailed description in combination with the embodiments of the present invention.

[0026] The aluminum alloy bearing bushing disassembly device has a structure including a fixing pin 1, a tension spring 2, an oil block 3, a first pressure spring 4, a support rod 5, an oil guide rod 6, a second pressure spring 7, a first reversing valve 8, a second reversing valve 9, and a third reversing valve 10, a total of 10 main components; the oil block 3 is provided with oil circuits a, b, and c; the oil circuit b is formed by connecting a straight channel and an annular channel, the straight channel on one side of the oil circuit b is connected to the second reversing valve 9, and the annular channel on the other side of the oil circuit b is connected to the bushing locking chamber, and the bushing locking chamber is provided with a tension spring 2 and a fixing pin 1, wherein the fixing pin 1 is provided with a first annular groove in the circumferential direction; one side of the oil circuit a is connected to the third reversing valve 10, and the other side of the oil circuit a is connected to the oil control chamber, on which an oil guide rod 6 and a second pressure spring 7 are provided, and the on-off state of the oil circuit a is determined by the position of the space where the first annular groove is located, and the second annular groove is provided on the oil guide rod 6; one side of the oil circuit c is connected to the first reversing valve 8, and the other side of the oil circuit c is connected to the sleeve pulling actuating chamber, on which a first pressure spring 4 and a support rod 5 are provided, and the on-off state of the oil circuit c is determined by the position of the space where the second annular groove is located.

[0027] The disassembly of aluminum alloy bearing bushings using this device is carried out in the following steps:

[0028] 1. This disassembly device is installed in the aluminum alloy bearing bushing to be disassembled. The oil block 3 has a self-centering function, and the clearance between its outer diameter and the aluminum alloy bearing bushing is 0.05-0.08mm, so that the disassembly device and the inner diameter of the bearing bushing can be automatically centered after installation. This function can realize that when the support rod-5 in the disassembly device is extended when disassembling the bearing bushing, the disassembly device can realize that the bushing is perpendicular to the reference plane under the self-centering function of the oil block 3 and the bushing.

[0029] 2. Simultaneously switch the first reversing valve 8, the second reversing valve 9 and the third reversing valve 10 to the oil pressure channel. The hydraulic oil acts on the fixing pin 1 through the oil circuit b, pushing the fixing pin 1 to move in the direction of the bushing and locking the bushing with the disassembly device. At this time, the fixing pin 1 is wedged into the aluminum alloy bearing bushing by 0.15-0.25 mm. The wedging depth only causes a dent-type plastic deformation on the inner diameter of the aluminum alloy bearing bushing, but does not cause deformation of the outer diameter of the bearing bushing. Therefore, it can ensure that the inner hole of the casing is not damaged. At this time, the second reversing valve 9 keeps the oil inlet state. Since the fluid pressure is equal everywhere, the fixing force of each fixing pin 1 on the aluminum alloy bearing bushing is almost the same, and the wedging depth is also almost the same, which can ensure uniform load distribution.

[0030] 3. Trigger the sleeve extraction function. When the fixing pin reaches the wedging depth, the first annular groove is connected with the oil circuit a. The hydraulic oil acts on the oil guide rod 6 through the oil circuit a and pushes the oil guide rod 6 to move toward the second pressure spring 7 and compress the second pressure spring 7. This step triggers the oil control function through the mechanical structure. The position is achieved by the first annular groove on the fixing pin 1 to realize the automatic opening of the oil circuit a. When the oil circuit a is automatically opened, it pushes the oil guide rod 6 to move toward the second pressure spring 7 and compress the second pressure spring 7. The second annular groove connects the oil circuit c and automatically triggers the subsequent functions.

[0031] 4. The bushing extraction function is triggered, and the hydraulic oil acts on the support rod 5 through the oil circuit c and pushes the support rod 5 to extend toward the casing body and be supported on the casing body. At this time, the part of the aluminum alloy bearing bushing disassembly device except the support rod 5 moves away from the casing body under the reaction force, thereby driving the bushing to be extracted to separate from the bushing bottom hole of the casing body, realizing the final bushing extraction action and pulling the bushing out of the casing body.

[0032] 5. The actuating chamber is reset. The support rod 5 is reset. After the bushing is pulled out from the casing body, the first reversing valve 8 is switched to the oil return channel. The support rod 5 is restored to its original position under the action of the first pressure spring 4. At this time, the hydraulic oil in the oil circuit c flows out through the oil return port of the reversing valve 8 into the oil source, so that the support rod 5 returns to its original position before the sleeve is pulled out, thereby resetting the actuating chamber.

[0033] 6. The oil control chamber oil guide rod 6 is reset. When the actuating chamber reset support rod 5 is reset, the third reversing valve 10 is switched to the oil return channel, and the oil guide rod 6 is restored to its original position under the action of the second pressure spring 7. At this time, the oil control chamber oil guide rod 6 is reset, and the oil circuit c is locked.

[0034] 7. The fixing pin 1 of the bushing locking chamber is reset. Switch the second reversing valve 9 to the oil return channel, and the fixing pin 1 is restored to its original position under the action of the tension spring 2. At this time, the locking function of the bushing and the disassembly device is successfully unlocked because the multiple fixing pins 1 evenly distributed around the circumference are restored to their original positions before the sleeve is removed.

[0035] 8. After the bushing is removed, the aluminum alloy bearing bushing that is pulled out loses the locking force limit of the fixing pin 1 and only contacts with the oil block 3. There is no limiting relationship between the bottom rib of the aluminum alloy bearing bushing and the oil block 3, and the inner hole of the aluminum alloy bearing bushing and the outer diameter of the oil block 3 of the disassembly device have a clearance fit of 0.05-0.08mm, which also has no limiting or locking effect. At this time, the disassembled bushing can be smoothly removed from the oil block 3 of the disassembly device, realizing the bushing removal function.

[0036] Through the above steps, the device relies on the matching clearance between the outer diameter of the oil block-3 and the inner diameter of the aluminum alloy bearing bushing to achieve the self-centering function after the device is installed, and at the same time uses the hydraulic principle to realize the synchronous extension of multiple fixing pins, which can be evenly wedged into the aluminum alloy bearing bushing to achieve equal locking force and balanced load on each force point of the bushing; the two-step operation of bushing locking and bushing removal in the sleeve removal process is automatically triggered through the logical relationship of the mechanical structure; at the same time, by pressing the reversing valve, the pulled-out bearing bushing can be semi-automatically loosened, the bushing can be removed and the device can be reset, reducing a large number of complex operations; the bushing can be pulled out vertically from the part body in a simple, labor-saving and efficient manner without destroying the accuracy of the part reference surface.

[0037] The design of the disassembly device has a simple structure and low manufacturing cost. The disassembly device can be used to easily disassemble the aluminum alloy bearing bushing by a single person without the aid of CNC equipment. The disassembly device can be widely used in the process of disassembling aluminum alloy bearing bushings in the repair of casing parts.

[0038] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall be the common meanings understood by the general technicians in the field to which this application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inside", "outside" and other words indicating orientation used in the description of this application are only used to indicate the relative direction or positional relationship, and do not imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, so it cannot be understood as a limitation on this application. The "first", "second", "third" and similar terms used in the description of this application are only used for descriptive purposes to distinguish different components, and cannot be understood as indicating or implying relative importance. The similar words "one", "one" or "the" used in the description of this application should not be understood as an absolute limitation on quantity, but should be understood as the existence of at least one. The similar words "including" or "comprising" used in the description of this application mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0039] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection 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, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0040] The above description is only a specific implementation mode of the present invention and is not intended to limit the present invention. Within the spirit and principle of the present invention, any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution content of the present invention, any modification, equivalent replacement, improvement, etc. made should be included in the protection scope of the present invention.

Claims

1. An aluminum alloy bearing bushing disassembly device, characterized in that: It includes a fixing pin, a tension spring, an oil passage block, a first pressure spring, a support rod, an oil guide rod, a second pressure spring, a first reversing valve, a second reversing valve, and a third reversing valve; the oil passage block is provided with an oil circuit a, an oil circuit b, and an oil circuit c; the oil circuit b is connected by a straight-through channel and an annular channel, the straight-through channel on one side of the oil circuit b is connected to the second reversing valve, the annular channel on the other side of the oil circuit b is connected to the bushing locking chamber, the bushing locking chamber is provided with a tension spring and a fixing pin, and the fixing pin is provided with a first annular groove in the circumference; one side of the oil circuit a is connected to the third reversing valve, the other side of the oil circuit a is connected to the oil control chamber, the oil control chamber is provided with an oil guide rod and a second pressure spring, and the on-off of the oil circuit a is determined by the position of the space where the first annular groove is located, and the oil guide rod is provided with a second annular groove; one side of the oil circuit c is connected to the first reversing valve, the other side of the oil circuit c is connected to the sleeve pulling actuating chamber, the sleeve pulling actuating chamber is provided with a first pressure spring and a support rod, and the on-off of the oil circuit c is determined by the position of the space where the second annular groove is located.

2. The device according to claim 1, characterized in that During operation, the bushing disassembly device is installed on the inner diameter of the bushing and the ribs at the bottom of the bushing, and the first reversing valve, the second reversing valve and the third reversing valve are switched to the oil pressure channel. The hydraulic oil acts on the fixing pin through the oil circuit b, pushing the fixing pin to move in the direction of the bushing and locking the bushing with the disassembly device. At the same time, the first annular groove is connected with the oil circuit a, and the hydraulic oil acts on the oil guide rod through the oil circuit a and pushes the oil guide rod to move toward the second pressure spring and compress the second pressure spring. At the same time, the second annular groove is connected with the oil circuit c, and the hydraulic oil acts on the support rod through the oil circuit c and pushes the support rod to extend in the direction of the casing body and support the casing body, thereby pulling the bushing out of the casing body; After the bushing is pulled out from the casing body, the first reversing valve is switched to the oil return channel, the support rod is restored to its original position under the action of the first pressure spring, the third reversing valve is switched to the oil return channel, the oil guide rod is restored to its original position under the action of the second pressure spring, the second reversing valve is switched to the oil return channel, and the fixing pin is restored to its original position under the action of the tension spring, thereby allowing the bushing to detach from the disassembly device.

3. The device according to claim 1, characterized in that There are a plurality of bushing locking cavities, which are evenly distributed on the annular channel.

4. The device according to claim 1, characterized in that The support rod is an H-shaped structure.

5. The device according to claim 1, characterized in that A rubber buffer pad is provided on the side of the support rod in contact with the casing body to achieve soft contact between the casing body and the support rod.

6. The device according to claim 1, characterized in that The other side of the oil circuit a is connected to the oil control chamber in a semi-annular structure, which can bypass the sleeve pulling actuation chamber.

7. The device according to claim 1, characterized in that A sealing ring is arranged between the support rod and the outer side of the oil passing block to prevent the hydraulic oil in the disassembly device from overflowing from the matching gap between the support rod and the oil passing block.

8. The device according to claim 1, characterized in that A sealing ring is arranged between one side of the protruding end of the fixing pin and the outer side of the oil passing block to prevent the hydraulic oil in the disassembling device from overflowing from the matching gap between one side of the protruding end of the fixing pin and the outer side of the oil passing block.

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