A device and method for disassembling a variable diameter valve sleeve

Abstract

The application discloses a device and method for disassembling a valve sleeve with different diameters, and relates to the technical field of aviation mechanical tooling. A specific embodiment of the application comprises a positioning transmission guide sleeve, a rotating nut, a shell end surface bearing, an open gasket, a knurled nut, a sleeve and a pull rod, wherein the knurled nut, the sleeve and the pull rod form a clamping structure. The application designs a device for disassembling a valve sleeve with different diameters, and proposes a labor-saving and non-damaging disassembling method. The horizontal rotating motion is finally converted into vertical pressing and linear motion, so that labor-saving and stable disassembling is realized, the shell hole wall is prevented from being scratched and the sealing ring is prevented from being cut, and the valve sleeve is disassembled without damage.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aviation mechanical tooling, and particularly relates to a device and method for disassembling a valve sleeve of unequal diameter. BACKGROUND

[0002] Generally, the fuel regulator of an aero-engine needs to be disassembled and inspected after a running test or product overhaul. The principle of disassembly operation is that no redundant material and shell damage should be caused during the disassembly process. The valve sleeve, as a key part of the fuel regulator, must be inspected. It is a difficult problem to achieve overall damage-free disassembly during the disassembly process, especially when the valve sleeve is disassembled. The breakage and cutting of the sealing ring occur, which is difficult to clean in the oil circuit of the fuel regulator, and is easy to block the oil circuit, causing fatal damage. In addition, the non-perpendicular disassembly of the valve sleeve will cause scratching and extrusion of the shell hole, resulting in the shell being scrapped due to the scratching and extrusion deformation of the hole, and causing great disturbance to the disassembly inspection. In particular, when the valve sleeve of unequal diameter is disassembled, because the valve sleeve of unequal diameter is relatively long and has more sealing rings on it, the valve sleeve needs to pass through more shell hollow grooves during disassembly. The above problems occur frequently, and it is more difficult to achieve damage-free disassembly.

[0003] Specifically, the disassembly resistance needs to be overcome (the tightness and friction force between the sealing ring after running and the shell hole), and the valve sleeve passes through more shell hollow grooves during disassembly. In the past, the traditional tight disassembly device is close to the inner hole of the valve sleeve, and the disassembly force is very large when the device is directly held by hand to pull out the valve sleeve from the shell. The disassembly force is not perpendicular to the assembly hole of the valve sleeve, and the bushing is easily scratched with the shell, which scratches and one-sidedly extrudes the shell hole. At the same time, the pulling action makes the instantaneous speed of the valve sleeve pulled out of the shell hole faster, and the sealing ring is easily cut when passing through the edge of the shell hole, resulting in the generation of redundant material, which is not conducive to the analysis of the running test result and the control of product cleanliness. The current disassembly method and traditional disassembly device cannot meet the needs of damage-free disassembly. SUMMARY

[0004] The present application proposes a labor-saving and damage-free disassembly method by designing a disassembly device for the valve sleeve of unequal diameter. The horizontal rotary motion is finally converted into vertical pressing and linear motion, which realizes labor-saving and stable disassembly, avoids scratching of the shell hole wall and cutting of the sealing ring, and achieves damage-free disassembly of the valve sleeve.

[0005] In view of this, according to an aspect of an embodiment of the present application, a device for dismounting a valve bush with different diameters is provided, which comprises a positioning transmission guide sleeve 1, a rotating nut 3, a shell end face bearing 5, an open pad block 6, a knurled nut 7, an expansion sleeve 8 and a pull rod 9, wherein the knurled nut 7, the expansion sleeve 8 and the pull rod 9 form a clamping structure, the positioning transmission guide sleeve 1, the rotating nut 3, the shell end face bearing 5, the open pad block 6 and a rotating rod 4 form a transmission structure, the clamping structure performs vertical upward straight line motion without rotation under the transmission guidance of the transmission structure; the lower end outer circle of the positioning transmission guide sleeve 1 is matched with the shell hole to ensure that the device is concentric with the valve bush mounting hole; the positioning transmission guide sleeve 1 is threadedly connected with the rotating nut 3, the inner hole of the positioning transmission guide sleeve 1 is matched with the expansion sleeve 8 to provide motion guidance for the expansion sleeve 8; the threaded part of the positioning transmission guide sleeve 1 forms a transmission pair with the rotating nut 3, so that the expansion sleeve 8 moves vertically upward under the guidance of the positioning transmission guide sleeve 1; the rotating nut 3 is provided with the shell end face bearing 5, and the rotating nut 3 rotates upward along the positioning transmission guide sleeve 1, which makes the upper and lower end faces of the open pad block 6 respectively abut and tightly press against the shell end face bearing 5 and the knurled nut 7; the open pad block 6 clamps the flat mouth on the expansion sleeve 8 to stop the rotation of the expansion sleeve 8, and the rotation of the knurled nut 7 makes the pull rod 9 go up to make the expansion sleeve 8 expand and tightly press against the valve bush hole wall; the upper end of the pull rod 9 is a conical surface structure, the conical surface angle is matched with the expansion sleeve 8, and the expansion sleeve 8 can be expanded during the movement.

[0006] Optionally, the positioning transmission guide sleeve 1 further comprises a handle 2.

[0007] Optionally, the motion guidance coaxial error between the positioning transmission guide sleeve 1 and the expansion sleeve 8 is in the range of φ0.02-φ0.04.

[0008] Optionally, the positioning transmission guide sleeve 1 is provided with a stepped hole, and when the dismounted valve bush reaches the end face of the stepped hole, the upward motion is limited.

[0009] Optionally, the positioning transmission guide sleeve 1 is made of aluminum alloy, and the round corner part of the outer circle is polished.

[0010] Optionally, the expansion sleeve 8 is made of beryllium bronze alloy.

[0011] Optionally, the outer circle part of the open pad block 6 and the knurled nut 7 is provided with an anti-skid mesh pattern knurling.

[0012] Optionally, the rotating nut 3 further comprises the rotating rod 4.

[0013] According to another aspect of an embodiment of the present application, a method for dismounting a valve bush with different diameters is provided, which comprises:

[0014] Step S1: placing the clamping structure composed of the knurled nut 7, the pull rod 9 and the expansion sleeve 8 into the valve bush hole to be dismounted;

[0015] Step S2: hold the expansion sleeve 8 with the open pad 6, tighten the knurled nut 7 to make the expansion sleeve 8 expand and tightly adhere to the inner wall of the valve sleeve hole to be disassembled;

[0016] Step S3: fix the positioning transmission guide sleeve 1, rotate the rotating nut 3, make the rotating nut 3 go up along the positioning transmission guide sleeve 1, top the open pad 6 and continue to go up, and take out the valve sleeve to be disassembled from the shell.

[0017] The application realizes the labor-saving, stable and non-damage disassembly of the valve sleeve with a sealing ring by easily rotating the rotating nut with a shell end surface bearing and driving the expansion sleeve to move vertically in the positioning transmission guide sleeve, and solves the problems of laborious operation, scratching of the bushing and the shell hole, and damage of the sealing ring during disassembly and assembly.

[0018] The application also has the assembly advantage that the open pad is removed, the expansion sleeve is expanded to tightly adhere to the bushing, and the bushing with different diameters can be assembled into the shell hole along the positioning transmission guide sleeve, and the sealing ring and the shell valve sleeve assembly hole are not damaged. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an assembly diagram of the disassembly device for the valve sleeve with different diameters according to the embodiment of the application;

[0020] Figure 2 It is a schematic view of the valve sleeve with different diameters and the shell assembly hole;

[0021] Figures 3-4 It is an assembly three-dimensional view of the disassembly device for the valve sleeve with different diameters according to the embodiment of the application;

[0022] Figure 5 It is a structure schematic view of the positioning transmission guide sleeve of the disassembly device for the valve sleeve with different diameters according to the embodiment of the application;

[0023] Figure 6 It is a structure schematic view of the rotating nut of the disassembly device for the valve sleeve with different diameters according to the embodiment of the application;

[0024] Figure 7 It is a structure schematic view of the open pad of the disassembly device for the valve sleeve with different diameters according to the embodiment of the application;

[0025] Figure 8 It is a structure schematic view of the knurled nut of the disassembly device for the valve sleeve with different diameters according to the embodiment of the application;

[0026] Figure 9 It is a structure schematic view of the expansion sleeve of the disassembly device for the valve sleeve with different diameters according to the embodiment of the application;

[0027] Figure 10Fig. 1 is a schematic view of a pull rod structure of a device for disassembling a valve sleeve with unequal diameters according to an embodiment of the present application;

[0028] Explanation of reference numerals:

[0029] 1-positioning transmission guide sleeve, 2-handle, 3-rotary nut, 4-rotation rod, 5-outer shell end face bearing, 6-opening cushion block, 7-knobbed nut, 8-expansion sleeve, 9-pull rod. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0031] The utility model provides a device for unequal diameter valve sleeve dismounting, which comprises a positioning transmission guide sleeve 1, a rotating nut 3, a shell end face bearing 5, an open cushion block 6, a knurled nut 7, a swelling sleeve 8 and a pull rod 9, wherein the knurled nut 7, the swelling sleeve 8 and the pull rod 9 form a clamping structure, the positioning transmission guide sleeve 1, the rotating nut 3, the shell end face bearing 5, the open cushion block 6 and a rotating rod 4 form a transmission structure, the clamping structure performs vertical upward non-rotating linear motion under the transmission guidance of the transmission structure as a whole, the lower end outer circle of the positioning transmission guide sleeve 1 is matched with the shell hole to ensure that the device is in the valve sleeve installation hole concentric, the inner hole of the positioning transmission guide sleeve 1 is matched with the swelling sleeve 8 to provide motion guidance for the swelling sleeve 8, the threaded part of the positioning transmission guide sleeve 1 forms a transmission pair with the rotating nut 3 to enable the swelling sleeve 8 to perform vertical upward motion under the guidance of the positioning transmission guide sleeve 1, the rotating nut 3 is provided with the shell end face bearing 5, the rotating nut 3 rotates upward along the positioning transmission guide sleeve 1, and the upper and lower end faces of the open cushion block 6 are respectively in close contact with the shell end face bearing 5 and the knurled nut 7, the flat mouth on the swelling sleeve 8 is clamped by the open cushion block 6 to stop the rotation of the swelling sleeve 8, the rotating knurled nut 7 makes the pull rod 9 go up to make the swelling sleeve 8 swell and tightly contact the valve sleeve hole wall, the upper end of the pull rod 9 is provided with a conical surface structure, the conical surface angle is matched with the swelling sleeve 8, and the swelling sleeve 8 can be made to swell in the movement process, wherein the structure of the puller for clamping the valve sleeve inner hole is formed by the knurled nut 7, the swelling sleeve 8 and the pull rod 9, the transmission structure is formed by the positioning transmission guide sleeve 1, the rotating nut 3, a cylindrical pin, the shell end face bearing 5 and the open cushion block 6, the clamping structure performs vertical upward linear motion under the transmission guidance of the transmission structure as a whole and does not rotate, the positioning transmission guide sleeve 1 mainly provides guidance and positioning for the swelling sleeve 8 and forms a transmission pair with the rotating nut 3, the positioning transmission guide sleeve 1 is matched with the concentric hole of the valve sleeve assembly hole of the shell to enable the swelling sleeve 8 and the valve sleeve to be vertically upward and not to be inclined in the movement process, and the valve sleeve is prevented from being scratched and extruded with the shell hole in the dismounting process, the shell end face bearing 5 is installed on the rotating nut 3, when the rotating nut 3 rotates, the upper end face of the bearing tightly contacts the open cushion block 6, the bearing rotates smoothly and has small resistance, and the open cushion block 6 can easily realize smooth vertical motion, the open cushion block 6 not only has the functions of tightly contacting the knurled nut 7 and the shell end face bearing 5, but also has the function of stopping the rotation of the swelling sleeve 8, the flat mouth on the swelling sleeve 8 is clamped in the process that the rotating knurled nut 7 makes the pull rod 9 go up to make the swelling sleeve 8 swell and tightly contact the valve sleeve hole, the open cushion block 6 has the function of an open wrench, the swelling sleeve 8 is stopped to rotate to facilitate the swelling of the swelling sleeve 8, the upward movement of the rotating nut 3 also makes the open cushion block 6 tightly contact the rotating nut 3 and the bearing end face, the open cushion block 6 is also stopped to rotate under the friction resistance of the two end faces, and the open cushion block 6 only performs vertical upward linear motion at this time, the swelling sleeve 8 adopts a straight circular and conical hole structure, which is similar to the umbrella rib structure, the structure can automatically center the valve sleeve inner hole when the swelling sleeve 8 swells, can generate a vertical diameter force and a vertical upward axial force, and can make the part swell more firmly.The pull rod 9 can be a high-hardness alloy steel material to ensure the strength and wear resistance of the device. The upper end of the pull rod 9 is a conical surface structure, and the conical surface angle is matched with the expansion sleeve 8 and is not self-locking, so as to ensure that the expansion sleeve 8 is uniformly expanded.

[0032] Further, the positioning transmission guide sleeve 1 further comprises a handle 2, which facilitates force application.

[0033] Further, the movement guiding coaxial error between the positioning transmission guide sleeve 1 and the expansion sleeve 8 is within the range of φ0.02-φ0.04.

[0034] Further, the positioning transmission guide sleeve 1 is provided with a stepped hole, and when the disassembled valve sleeve is stopped at the end face of the stepped hole, the upward movement is limited.

[0035] Further, the positioning transmission guide sleeve 1 is made of aluminum alloy, and the round corner part of the outer circle is polished.

[0036] Further, the expansion sleeve 8 is made of beryllium bronze alloy, which has the dual characteristics of wear resistance and elastic deformation, and the size recovers to the original state after rebound.

[0037] Further, the outer round part of the open pad block 6 and the knurled nut 7 is provided with an anti-slip mesh pattern knurling.

[0038] Further, the rotating nut 3 further comprises a rotating rod 4, which facilitates operation.

[0039] According to another aspect of the embodiment of the present application, a method for disassembling a variable-diameter valve sleeve is provided, comprising:

[0040] Step S1: placing the clamping structure composed of the knurled nut 7, the pull rod 9 and the expansion sleeve 8 into the valve sleeve hole to be disassembled;

[0041] Step S2: clamping the expansion sleeve 8 with the open pad block 6 and tightening the knurled nut 7 to make the expansion sleeve 8 expand and tightly adhere to the inner wall of the valve sleeve hole to be disassembled;

[0042] Step S3: fixing the positioning transmission guide sleeve 1, rotating the rotating nut 3, making the rotating nut 3 move upward along the positioning transmission guide sleeve 1, continuing to move upward after tightly pressing the open pad block 6, and taking out the valve sleeve to be disassembled from the shell.

[0043] The present application realizes labor-saving, stable and non-damaging disassembly of the variable-diameter valve sleeve with a sealing ring by easily rotating the rotating nut with a shell end surface bearing and driving the expansion sleeve to move vertically in the positioning transmission guide sleeve, and solves the problems of labor-intensive operation, scratching and cutting of the sealing ring during disassembly of the traditional device.

[0044] This invention also has the advantage of being usable for assembly. After removing the opening pad and tightening the bushing, the bushings of different diameters can be inserted into the housing hole along the positioning transmission guide sleeve without causing scratches on the housing valve fitting hole or damage to the sealing ring.

[0045] Example 1

[0046] like Figures 1-10 As shown, the present invention provides a valve sleeve disassembly device with unequal diameter, which includes a positioning transmission guide sleeve 1, a handle 2, a rotating nut 3, a rotating rod 4, a shell end face bearing 5, an open pad 6, a knurled nut 7, a expansion sleeve 8, and a pull rod 9. The knurled nut 7, the expansion sleeve 8, and the pull rod 9 form a clamping structure that clamps the inner hole of the valve sleeve. The positioning transmission guide sleeve 1, the rotating nut 3, the shell end face bearing 5, the open pad 6, the handle 2, and the rotating rod 4 form a transmission structure. The clamping structure as a whole performs a vertical upward linear motion without rotation under the transmission guidance of the transmission structure.

[0047] The main function of the positioning and transmission guide sleeve 1 is to provide positioning, guidance, and transmission for the overall device. Its lower outer circle mates with the housing hole to ensure the device is within the concentric range of φ0.02 of the valve sleeve mounting hole. The inner hole of the positioning and transmission guide sleeve 1 slides with the expansion sleeve 8 of the clamping structure by 0.01-0.02, providing motion guidance for the expansion sleeve 8. The threaded portion of the positioning and transmission guide sleeve 1 forms a transmission pair with the rotating nut 3, allowing the expansion sleeve 8 of the clamping structure to move vertically upward under the guidance of the positioning and transmission guide sleeve 1. The coaxial error of the motion guidance between the positioning and transmission guide sleeve 1 and the expansion sleeve 8 is within the range of φ0.02-φ0.04, which allows for clearance-based movement within the housing hole during valve sleeve disassembly, preventing the valve sleeve from interfering with movement during operation. The housing bore is protected against scraping and squeezing, especially preventing the valve sleeve from scraping and squeezing at the empty groove on the housing, thus preventing damage to the sealing ring. The thread on the positioning transmission guide sleeve 1 allows the device to disassemble the valve sleeve until the sealing ring on the valve sleeve no longer contacts the housing bore. At the same time, the positioning transmission guide sleeve 1 is provided with a stepped hole. When the disassembled valve sleeve reaches the end face of the stepped hole, the upward movement is restricted, and the rotating rod 4 cannot rotate, indicating that the disassembly is in place, ensuring the device is safe and does not fall off, and will not damage the housing. The positioning transmission guide sleeve 1 is made of aluminum alloy with polished rounded corners on the outer circle to avoid scratching parts. It has sufficient strength and is relatively light in weight for easy use.

[0048] The expansion sleeve 8 is made of beryllium bronze alloy, which has the dual characteristics of wear resistance and elastic deformation. After springback, the dimensions return to the original state. The expansion sleeve 8 itself has high coaxiality requirements. It adopts a straight circle and tapered hole structure. When the expansion sleeve 8 is tightened, it will generate an automatic centering effect with the inner hole of the valve sleeve. It can also generate a radial force perpendicular to the inner hole of the valve sleeve and a vertical upward axial force, making the parts more firmly tightened and providing sufficient adhesion on the inner hole of the valve sleeve to ensure that it will not slip during disassembly.

[0049] The rotating nut 3 is provided with a shell end face bearing 5. When the rotating nut 3 rotates upward along the positioning transmission guide sleeve 1, the upper and lower end faces of the open cushion block 6 will be in contact with the shell end face bearing 5 and the knurled nut 7 respectively and be pressed tightly. Since the friction force of the steel ball of the shell end face bearing 5 is far less than the friction force of the two end faces of the open cushion block 6, the steel ball of the shell end face bearing 5 rolls, while the open cushion block 6 does not rotate by itself under the friction resistance of the two end faces. At this time, the screw thread lifting force of the rotating nut 3 can be converted into the vertical upward pressing force of the open cushion block 6 on the upper end face of the shell end face bearing 5. Since the steel ball of the shell end face bearing 5 rotates smoothly and has small resistance, the open cushion block 6 can easily realize smooth and labor-saving vertical movement under the action of the torque of the handle 2. At this time, the steel ball of the shell end face bearing 5 rolls, and the open cushion block 6 only makes linear vertical movement, thereby driving the knurled nut 7 and the whole clamping structure to make linear vertical movement under the positioning and guidance of the positioning transmission guide sleeve 1. The smooth rotating action of the rotating nut 3 also allows the sealing ring on the valve sleeve to smoothly pass through the edge part of the empty slot of the shell hole, preventing the sealing ring on the valve sleeve from being cut.

[0050] The open cushion block 6 not only plays the role of pressing the knurled nut 7 and tightly contacting the end face of the shell end face bearing 5, but also plays the role of stopping the rotation of the expansion sleeve 8 when the expansion sleeve 8 tightens the valve sleeve, making the expansion sleeve 8 tighten the valve sleeve more easily.

[0051] The pull rod 9 is made of high-hardness alloy steel material, which ensures the strength and wear resistance of the pull rod 9. The upper end of the pull rod 9 is a conical surface structure, and the conical surface angle cooperates with the expansion sleeve 8 without self-locking, which can uniformly expand the expansion sleeve 8. At the same time, the conical surface part of the pull rod 9 provides radial support force for the expansion sleeve 8, ensuring that the expansion sleeve 8 tightly contacts the valve sleeve hole.

[0052] The handle 2 and the rotating rod 4 play an auxiliary role. When the rotating nut 3 moves on the positioning transmission guide sleeve 1, the handle 2 and the rotating rod 4 can realize torque to make the rotating nut 3 rotate easily. The rotating nut 3 has the characteristics of self-locking and transmission function when the screw thread is subjected to axial force. The design of fixed pitch and specific thread type ensures that one rotation of the rotating nut 3 moves the expansion sleeve upward by a specific displacement. The auxiliary function of the handle 2 ensures that the positioning transmission guide sleeve 1 does not rotate on the shell, thereby preventing friction damage to the shell.

[0053] The device does not need additional fixation, the shell and the device itself is in a state of force balance, the device realizes the conversion of the rotating force of the rotating rod 4 of the transmission system into the friction force of the open pad 6 and the bearing and knurled nut, and the vertical upward lifting force of the rotating nut 3, wherein the shell is subjected to a vertical downward pressure which is the same size and opposite direction to the vertical lifting force of the nut, and the auxiliary handle 2 helps the whole device not to rotate on the shell.

[0054] The device replaces the laborious and uncontrollable speed pulling action with a simple labor-saving and controllable speed rotating action, realizes the vertical upward, labor-saving and non-destructive disassembly method of the unequal diameter valve sleeve, solves the problem of cutting damage of the sealing ring caused by the disassembly of the unequal diameter valve sleeve, the damage of the shell hole causing the shell to be scrapped, and safely realizes the labor-saving and non-destructive disassembly of the unequal diameter valve sleeve of the aviation fuel pump.

[0055] The operation process of the disassembly includes the following steps:

[0056] Step one, assemble the positioning transmission guide sleeve with handle, the rotating nut with end face bearing and rotating rod on the hole concentric with the shell valve sleeve assembly hole for positioning;

[0057] Step two, put the knurled nut, pull rod and expansion sleeve into the hole of the valve sleeve to be disassembled in the shell;

[0058] Step three, use the open pad to block the expansion sleeve, tighten the knurled nut to make the expansion sleeve expand and tightly adhere to the inner wall of the valve sleeve hole;

[0059] Step four, hold the handle and rotate the rotating rod to make the rotating nut go up along the positioning transmission guide sleeve, and continue to go up after the open pad is tightly pressed, until the rotating rod is limited in rotation;

[0060] Step five, after the above disassembly action is completed, hold the device and take it out from the shell along the vertical direction.

[0061] The above is only a specific embodiment of the present application, which is described in detail, and the part not described is a conventional technology. However, the protection scope of the present application is not limited to this, any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A device for dismounting a valve sleeve of unequal diameter, characterized in that, The device comprises a positioning transmission guide sleeve (1), a rotating nut (3), a canned end face bearing (5), an open gasket (6), a knurled nut (7), a swelling sleeve (8) and a pull rod (9), wherein the swelling sleeve (8) and the pull rod (9) form a clamping structure, the positioning transmission guide sleeve (1), the rotating nut (3), the canned end face bearing (5) and the open gasket (6) form a transmission structure, and the clamping structure moves vertically upward without rotation under the transmission of the transmission structure. The lower end of the positioning transmission guide sleeve (1) is matched with the hole of the shell to ensure that the device is concentric with the valve sleeve installation hole; the positioning transmission guide sleeve (1) is threadedly connected with the rotating nut (3), the inner hole of the positioning transmission guide sleeve (1) is matched with the swelling sleeve (8) to provide movement guidance for the swelling sleeve (8); and the threaded part of the positioning transmission guide sleeve (1) forms a transmission pair with the rotating nut (3) to enable the swelling sleeve (8) to move vertically upward under the guidance of the positioning transmission guide sleeve (1). The rotating nut (3) is provided with the canned end face bearing (5), and the rotating nut (3) rotates upward along the positioning transmission guide sleeve (1) to make the upper and lower end faces of the open gasket (6) respectively abut against and tightly abut against the canned end face bearing (5) and the knurled nut (7). The open gasket (6) is used to clamp the flat opening of the swelling sleeve (8) to stop the rotation of the swelling sleeve (8), and the knurled nut (7) is rotated to make the pull rod (9) move upward to make the swelling sleeve (8) swell and tightly abut against the valve sleeve hole wall. The upper end of the pull rod (9) is a conical surface structure, the conical surface angle is matched with the swelling sleeve (8), and the swelling sleeve (8) can be made to swell during movement. The positioning transmission guide sleeve (1) further comprises a handle (2).

2. The apparatus of claim 1, wherein, The coaxial error of the movement guidance between the positioning transmission guide sleeve (1) and the swelling sleeve (8) is within the range of φ0.02-φ0.

04.

3. The apparatus of claim 1, wherein, A stepped hole is arranged on the positioning transmission guide sleeve (1), and when the disassembled valve sleeve abuts against the end face of the stepped hole, the upward movement is limited.

4. The apparatus of claim 1, wherein, The positioning transmission guide sleeve (1) is made of aluminum alloy, and the round corner part of the outer circle is polished.

5. The apparatus of claim 1, wherein, The swelling sleeve (8) is made of beryllium bronze alloy.

6. The apparatus of claim 1, wherein, The outer circle part of the open gasket (6) and the knurled nut (7) is provided with an anti-skid mesh pattern knurling.

7. The apparatus of claim 1, wherein, The rotating nut (3) further comprises a rotating rod (4).

8. The apparatus of claim 1, wherein, The device is used, and the device comprises the following steps:

9. A method for disassembling a variable diameter valve sleeve, characterized in that, S1: the clamping structure composed of the knurled nut (7), the pull rod (9) and the swelling sleeve (8) is placed into the valve sleeve hole to be disassembled; S2: the swelling sleeve (8) is clamped by the open gasket (6), the knurled nut (7) is tightened to make the swelling sleeve (8) swell and tightly abut against the inner wall of the valve sleeve hole to be disassembled; S3: the positioning transmission guide sleeve (1) is fixed, the rotating nut (3) is rotated, the rotating nut (3) moves upward along the positioning transmission guide sleeve (1), the open gasket (6) is tightly abutted against and then the rotating nut (3) continues to move upward, and the disassembled valve sleeve is taken out from the shell. ​

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