Tool clamp and method for disassembling sealing and supporting plug pin threaded sleeve

Abstract

The invention belongs to the technical field of mechanical maintenance, and particularly relates to a tool clamp and a method for disassembling a sealing supporting bolt thread sleeve. Comprising a first clamping piece, a second clamping piece and a screw. One end of the screw rod is fixedly connected with an end head, and the other end of the screw rod sequentially penetrates through a first through hole formed in the first clamping piece and a second through hole formed in the second clamping piece; the first clamping piece and the second clamping piece are used for clamping the sealing supporting and bearing platform; a fastener is arranged at the end, away from the first clamping piece, of the second clamping piece and used for clamping and sealing the supporting and bearing platform. According to the method, on the basis that a bench drilling machine and manual operation are combined, on the basis that a tool clamp is used for fixing the sealing support to the bench drilling machine for drilling, the problems of non-concentricity, bolt breakage, thread damage and the like of the bolt and the thread sleeve are mainly solved through different working procedures, the maintenance quality and the working efficiency can be practically and effectively improved, and the working efficiency is improved. Loss of tools and parts is reduced, safety and reliability are achieved, and meanwhile the detaching success rate is greatly increased.

Description

Technical Field

[0001] The present application belongs to the field of mechanical maintenance technology, and specifically relates to a tooling fixture and a method for disassembling a sealing support latch screw sleeve. Background Art

[0002] The APU (Auxiliary Power Unit) is an aircraft's auxiliary power unit, and latch nuts are commonly used fasteners in the APU core. Therefore, during APU core disassembly, the condition of the latch nuts must be checked to determine whether the old latch nuts in the air static seal support (hereinafter referred to as the seal support) need to be removed and replaced with new ones. The seal support bolts are inserted through the flange holes in the seal, threaded through the combustion chamber flange holes, and then screwed into the latch nuts installed on the seal support to achieve the connection. Therefore, during disassembly, due to erosion, the connection is overtightened, and excessive force applied can cause the bolts to break, making them impossible to remove. Furthermore, as the APU's on-wing operation time increases, component erosion becomes more pronounced, leading to an increase in bolt breakage. According to statistical data from specific operations, latch nut failures generally fall into four categories: loss of self-locking force (50%), bolt breakage (25%), loosening of the screw (15%), and thread damage (10%).

[0003] In the prior art, the conventional method for replacing a latch screw sleeve is to drill it manually. First, select a suitable drill bit, manually secure the seal support to the table or use clamps. After drilling to a certain depth with an air drill, use a hammer and hook to knock down and remove the latch. Then, use a reverse tap to remove the screw sleeve. After removing the screw sleeve, clean the bottom hole with a cleaner, apply thread sealant, and use a special tool to screw the screw sleeve in. Finally, hammer the latch into the bottom hole.

[0004] In practice, due to the strength and centering limitations of hand drill bits, manually using an air drill makes it difficult to accurately control the rotational speed and force, often resulting in damage to the tool or the bottom hole, increasing repair costs. When encountering severe thread erosion, reverse taps often prevent the sleeve from being removed, resulting in low repair efficiency and success rates. When a bolt breaks off in the latch sleeve, the workload is even more demanding, and the removal success rate is even lower. Furthermore, a single seal support has six latch sleeves, which typically need to be replaced simultaneously, resulting in extremely demanding work and a high risk of operator fatigue and danger. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art, namely, the problem of high cost, low efficiency and low success rate in removing the latch screw sleeve by using a manual hand drill.

[0006] In view of this, a first aspect of the present invention provides a fixture specifically used for clamping a seal support to facilitate the removal of a latch screw sleeve using a bench drill press.

[0007] The second aspect of the present invention provides a method for disassembling a sealing support pin screw sleeve. The method is based on a benchtop drilling machine and the above-mentioned tooling fixture, which can effectively improve the maintenance quality and work efficiency, reduce the loss of tools and parts, and is safe and reliable while greatly improving the disassembly success rate.

[0008] The specific technical solutions include the following:

[0009] According to the first aspect of an embodiment of the present application, a tooling fixture is provided, including a first clamping member, a second clamping member and a screw; one end of the screw is fixedly connected to an end head, and the other end passes through a first through hole opened on the first clamping member and a second through hole opened on the second clamping member in sequence; the first clamping member and the second clamping member are used to clamp a sealing support and a carrying platform; a fastener is provided on an end of the second clamping member away from the first clamping member, for clamping the sealing support and the carrying platform.

[0010] Furthermore, the first clamping member is arranged below the carrying platform; the second clamping member is arranged above the carrying platform, and the sealing support is clamped between the second clamping member and the carrying platform.

[0011] Furthermore, a groove is provided on one end of the first clamping member close to the carrying platform, and the shape of the groove is adapted to the shape of the supporting ribs on the bottom surface of the carrying platform.

[0012] Furthermore, a boss is provided at one end of the second clamping member close to the bearing platform, and the cross-sectional shape of the boss is adapted to the shape of the hollow portion of the sealing support.

[0013] Preferably, the fastener comprises a nut threaded onto the screw.

[0014] Furthermore, a gasket is provided between the end head and the first clamping member and between the fastener and the second clamping member.

[0015] According to the second aspect of the embodiment of the present application, a method for disassembling a sealing support pin screw sleeve is provided. During the process of disassembling the sealing support pin screw sleeve, the method uses a bench drill press and a fixture as described in any of the above technical solutions, and the supporting platform is the platform of the bench drill press. The method includes: passing the end of the screw away from the end through the first through hole, the through hole of the supporting platform, the hollow part of the sealing support and the second through hole in sequence; adjusting the fastener so that the first clamping member, the supporting platform, the sealing support and the second clamping member are tightly clamped; using the drill bit of the bench drill press to drill the pin screw sleeve on the sealing support; and removing the pin screw sleeve.

[0016] Furthermore, the step of passing the end of the screw away from the end through the first through hole, the through hole of the supporting platform, the hollow part of the sealing support and the second through hole in sequence also includes: clamping the groove of the first clamping member to the support ribs on the bottom surface of the supporting platform; and inserting the boss of the second clamping member into the hollow part.

[0017] Furthermore, before adjusting the fastener, the method further includes: adjusting the height and angle of the bearing platform so that the drill bit is aligned with the center point of the latch screw sleeve.

[0018] Furthermore, after drilling the latch screw sleeve on the sealing support using the drill bit of the bench drill press, the method further includes: grinding the latch portion and the sleeve body of the latch screw sleeve; and removing the latch screw sleeve includes removing the two halves of the sleeve body separately.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] The fixture and method of the present application are based on a method that combines a bench drill press and manual operation. On the basis of using the fixture to fix the sealing support on the bench drill press for drilling, different working procedures are used to focus on solving the problems faced by the pin screw sleeve such as eccentricity, bolt breakage and thread damage. It can effectively improve the maintenance quality and work efficiency, reduce the loss of tools and parts, and greatly improve the disassembly success rate while being safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiment below. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present application. In the accompanying drawings:

[0022] Figure 1 This is a process flow chart of an embodiment of the present application;

[0023] Figure 2 This is a schematic structural diagram of the fixture according to an embodiment of the present application;

[0024] Figure 3 This is a schematic cross-sectional view of the fixture according to an embodiment of the present application;

[0025] Figure 4 This is a structural diagram of the sealing support according to an embodiment of the present application;

[0026] Figure 5 This is a data comparison table of the embodiments of the present application and the prior art.

[0027] The reference numerals indicate:

[0028] 1-first clamping member; 11-first through hole; 12-groove; 2-second clamping member; 21-second through hole; 22-boss; 3-screw; 31-end; 32-nut; 4-gasket; 5-sealing support; 51-hollow part; 52-pin screw sleeve; 6-bearing platform. DETAILED DESCRIPTION

[0029] In order to better understand the above technical solution, the technical solution of the embodiment of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiment of the present application and the specific features in the embodiment are detailed descriptions of the technical solution of the embodiment of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiment of the present application and the technical features in the embodiment can be combined with each other.

[0030] In view of this, according to a first aspect of an embodiment of the present application, a fixture is provided, such as Figure 2 、 Figure 3 As shown, it includes a first clamping member 1, a second clamping member 2 and a screw 3; one end of the screw 3 is fixedly connected to an end head 31, and the other end passes through a first through hole 11 opened on the first clamping member 1 and a second through hole 21 opened on the second clamping member 2; the first clamping member 1 and the second clamping member 2 are used to clamp the sealing support 5 and the supporting platform 6; a fastener is provided on the end of the second clamping member 2 away from the first clamping member 1, which is used to clamp the sealing support 5 and the supporting platform 6.

[0031] Furthermore, in one embodiment, Figure 3 As shown, the first clamping member 1 is arranged below the carrying platform 6; the second clamping member 2 is arranged above the carrying platform 6, and the sealing support 5 is clamped between the second clamping member 2 and the carrying platform 6.

[0032] Specifically, compared with a hand drill, a bench drill has the characteristics of stable rotation speed, high verticality, and fast feed rate. Faced with various problems of the latch screw sleeves that need to be disassembled, including bolt breakage, a bench drill can be used to complete the initial drilling work. In order to ensure that the sealing support can be reliably fixed on the bench drill, it is necessary to design a special fixture to position the sealing support. Therefore, the fixture of the present application is specifically designed in combination with the structure and size of the bench drill and the sealing support. The method of using a bench drill and a fixture can save the effort of a hand drill, make the work easier, and is more suitable for batch replacement of latch screw sleeves. In a specific embodiment, the bench drill is generally composed of a motor, a spindle box, a spindle, a base, a feed handle and a work platform, and the carrying platform 6 is the working platform of the bench drill.

[0033] Furthermore, in one embodiment, Figure 2 As shown, a groove 12 is provided on one end of the first clamping member 1 close to the carrying platform 6 , and the shape of the groove 12 is adapted to the shape of the supporting ribs on the bottom surface of the carrying platform 6 .

[0034] Specifically, two intersecting support ribs are provided at the bottom of the carrying platform 6 to support the carrying platform 6. The grooves 12 provided on the first clamping member 1 are used to engage the support ribs, which not only allows the first clamping member 1 to fit more closely with the carrying platform 6 but also prevents the first clamping member 1 from shifting horizontally, thereby fixing the position of the first clamping member 1.

[0035] Furthermore, in one embodiment, Figure 2 、 Figure 4 As shown, a boss 22 is provided at one end of the second clamping member 2 close to the carrying platform 6 , and the cross-sectional shape of the boss 22 is adapted to the shape of the hollow portion 51 of the sealing support 5 .

[0036] Specifically, the hollow portion 51 of the sealing support 5 is much larger than the screw 3. Therefore, even when the sealing support 5 is clamped vertically, it is difficult to prevent the sealing support 5 from shifting horizontally. The shape and size of the boss 22 allow it to be inserted into the hollow portion 51 and completely fit around the peripheral sidewalls of the hollow portion 51, thereby preventing the sealing support 5 from shifting horizontally.

[0037] Preferably, in a specific embodiment, Figure 2 、 Figure 3 As shown, the fastener includes a nut 32 threaded onto the screw rod 3 .

[0038] Specifically, when the first clamping member 1 and the second clamping member 2 clamp the sealing support 5 and the bearing platform 6, rotating the nut 32 exerts a downward pressure on the second clamping member 2, while the end head 31 exerts an upward pressure on the first clamping member 1, so that the sealing support 5 and the bearing platform 6 are clamped firmly. It should be noted that other fasteners capable of achieving the same effect, such as buckles, are also within the protection scope of the present application.

[0039] Further, in one embodiment, as shown in Figure 2 、 Figure 3 a gasket 4 is arranged between the end head 31 and the first clamping member 1 and between the fastener and the second clamping member 2.

[0040] According to a second aspect of the present application, a method for disassembling a sealing support pin sleeve is provided. In the process of disassembling the sealing support pin sleeve, a bench drill and the tooling fixture according to any of the above technical solutions are used, and the bearing platform 6 is the platform of the bench drill. The method comprises the following steps: sequentially passing an end of the screw rod 3 away from the end head 31 through the first through hole 11, the through hole of the bearing platform 6, the hollow part 51 of the sealing support 5, and the second through hole 21; adjusting the fastener to clamp the first clamping member 1, the bearing platform 6, the sealing support 5, and the second clamping member 2 tightly; using a drill bit of the bench drill to drill the pin sleeve 52 on the sealing support 5; and taking out the pin sleeve 52.

[0041] Further, in one embodiment, the step of sequentially passing the end of the screw rod 3 away from the end head 31 through the first through hole 11, the through hole of the bearing platform 6, the hollow part 51 of the sealing support 5, and the second through hole 21 further comprises the following steps: clamping the support rib plate on the bottom surface of the bearing platform 6 with the groove 12 of the first clamping member 1; and inserting the boss 22 of the second clamping member 2 into the hollow part 51.

[0042] Further, in one embodiment, before the step of adjusting the fastener, the method further comprises the following step: adjusting the height and angle of the bearing platform 6 so that the drill bit is aligned with the center point of the pin sleeve 52.

[0043] Specifically, the steps of the method according to the present solution are as follows:

[0044] S1: clamping the support rib plate on the bottom surface of the bearing platform 6 with the groove 12 of the first clamping member 1;

[0045] S2: Put the gasket 4 on the screw 3, then pass the screw 3 through the first through hole 11, the through hole of the carrying platform 6, the hollow part 51 of the sealing support 5 and the second through hole 21, and insert the boss 22 into the hollow part 51;

[0046] S3: Insert another washer 4 into the screw 3, and then screw the nut 32 onto the screw 3;

[0047] S4: Adjust the height and angle of the carrying platform 6 so that the drill bit is aligned with the center point of the latch screw sleeve 52;

[0048] S5: Tighten the nut 32;

[0049] S6: Drilling the pin nut 52 with the drill bit;

[0050] S7: Take out the latch screw sleeve 52.

[0051] Furthermore, in one embodiment, when it is necessary to remove other latch screw sleeves (hereinafter referred to as subsequent latch screw sleeves) of the same sealing support 5, after step S7, the following steps are repeated:

[0052] S8: Loosen the nut 32;

[0053] S9: Adjust the angle of the carrying platform 6 so that the drill bit is aligned with the center point of the subsequent plug screw sleeve;

[0054] S10: Tighten the nut 32;

[0055] S11: drilling the subsequent pin nut with the drill bit;

[0056] S12: Take out the subsequent latch screw sleeve.

[0057] In a specific embodiment, in view of the specific situation of the sealing support, in order to ensure that sufficient cutting force is generated, the minimum rotation speed of the bench-top drilling machine is set to 365 r / min.

[0058] Furthermore, in one embodiment, after drilling the latch screw sleeve 52 on the sealing support 5 using the drill bit of the bench drill press, the method further includes: grinding the latch portion and the screw sleeve body of the latch screw sleeve 52; and removing the latch screw sleeve 52 includes removing the two halves of the screw sleeve body separately.

[0059] Specifically, if the latch screw sleeve 52 has uneven leakage of the latch portion after drilling, a milling cutter can be used to grind the latch portion so that it can be removed. This is called the grinding method. Furthermore, the screw sleeve body of the latch screw sleeve 52 after drilling naturally splits into two halves. Therefore, if the latch screw sleeve 52 has thread damage, the screw sleeve body can be ground and the two halves can be destructively removed without damaging the bottom hole of the screw sleeve. This is called the split-half method. Furthermore, if the screw sleeve body is still difficult to remove, this method can also grind the screw sleeve body into multiple fragments and remove them one by one.

[0060] In summary, based on the method of this solution, the maintenance process of the sealing support bolt sleeve is as follows: Figure 1 As shown. The process flow of this solution is compared with the various indicators of the existing technology. Figure 5 As shown, it can be seen that the method of this solution greatly improves work efficiency, greatly reduces maintenance costs, and can achieve a 100% disassembly success rate.

[0061] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fixture, characterized in that: It comprises a first clamping member (1), a second clamping member (2) and a screw (3); One end of the screw rod (3) is fixedly connected to an end head (31), and the other end passes through a first through hole (11) provided on the first clamping member (1) and a second through hole (21) provided on the second clamping member (2) in sequence; The first clamping member (1) and the second clamping member (2) are used to clamp the sealing support (5) and the bearing platform (6); A fastener is provided on one end of the second clamping member (2) away from the first clamping member (1) for clamping the sealing support (5) and the bearing platform (6).

2. The fixture according to claim 1, characterized in that: The first clamping member (1) is arranged below the carrying platform (6); The second clamping member (2) is arranged above the bearing platform (6), and the sealing support (5) is clamped between the second clamping member (2) and the bearing platform (6).

3. The fixture according to claim 2, characterized in that: A groove (12) is provided on one end of the first clamping member (1) close to the carrying platform (6), and the shape of the groove (12) is adapted to the shape of the supporting ribs on the bottom surface of the carrying platform (6).

4. The fixture according to claim 2, characterized in that: A boss (22) is provided at one end of the second clamping member (2) close to the bearing platform (6), and the cross-sectional shape of the boss (22) is adapted to the shape of the hollow portion (51) of the sealing support (5).

5. The fixture according to claim 1, characterized in that: The fastener comprises a nut (32) threaded onto the screw rod (3).

6. The fixture according to claim 1, characterized in that: Gaskets (4) are provided between the end head (31) and the first clamping member (1), and between the fastener and the second clamping member (2).

7. A method for disassembling a seal support latch screw sleeve, characterized in that: During the process of disassembling the sealing support latch screw sleeve, a benchtop drilling machine and the fixture according to any one of claims 1 to 6 are used, and the carrying platform (6) is the platform of the benchtop drilling machine, and the method comprises: Passing the end of the screw rod (3) away from the end head (31) through the first through hole (11), the through hole of the carrying platform (6), the hollow portion (51) of the sealing support (5), and the second through hole (21) in sequence; Adjusting the fasteners to ensure that the first clamping member (1), the carrying platform (6), the sealing support (5) and the second clamping member (2) are tightly clamped; Drilling the latch screw sleeve (52) on the sealing support (5) using the drill bit of the bench-type drilling machine; Take out the latch screw sleeve (52).

8. The method for disassembling the seal support latch screw sleeve according to claim 7, characterized in that: The step of sequentially passing the end of the screw (3) away from the end head (31) through the first through hole (11), the through hole of the carrying platform (6), the hollow portion (51) of the sealing support (5), and the second through hole (21) further comprises: The groove (12) of the first clamping member (1) is clamped onto the supporting ribs on the bottom surface of the carrying platform (6); Insert the boss (22) of the second clamping member (2) into the hollow portion (51).

9. The method for disassembling the seal support latch screw sleeve according to claim 7, characterized in that: Before adjusting the fastener, the method further comprises: adjusting the height and angle of the bearing platform (6) so that the drill bit is aligned with the center point of the latch screw sleeve (52).

10. The method for disassembling the seal support latch screw sleeve according to claim 7, characterized in that: After drilling the latch screw sleeve (52) on the sealing support (5) using the drill bit of the bench-type drilling machine, the method further comprises: grinding the latch portion and the screw sleeve body of the latch screw sleeve (52); The process of removing the latch screw sleeve (52) comprises removing the two halves of the screw sleeve body respectively.

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