Lock plate removal tool and method

Abstract

This invention discloses a lock plate disassembly tool and method, comprising a left clamp handle, a right clamp handle, a left clamp block, a right clamp block, a first pin, a second pin, a third pin, a fourth pin, and a fifth pin. The right clamp block is connected to both the left and right clamp handles, and its end has a cylindrical section. The left clamp block is connected to both the left and right clamp handles, and its end has a flat section with a straight cutting edge. When the left and right clamp handles are brought close together, the straight cutting edge of the flat section and the cylinder simultaneously move closer together. To disassemble the lock plate, simply insert the cylinder into the cylindrical hole on the bolt end face or into the V-shaped groove on the bolt surface, then insert the straight cutting edge of the flat section into the lock plate gap, and finally close the left and right clamp blocks to pull out the lock plate. This invention provides a simple and convenient lock plate disassembly method, reducing disassembly time and maintenance costs.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine assembly and testing technology, specifically a tool and method for disassembling locking plates during engine assembly and maintenance. Background Technology

[0002] During engine assembly and maintenance, parts often need to be disassembled and reassembled. Among these, the locking structure consisting of bolts, locking washers, and locking plates is one of the most common disassembly mechanisms. Removing the locking plate usually involves using a flat chisel and a hammer. The flat chisel is inserted between the locking plate and the locking washer... Figure 2 As shown, the lock plate is removed by tapping with a flat chisel. This method often damages surrounding parts during disassembly, and in severe cases, it can render parts unusable. The removed locking washers are also all rendered unusable. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention aims to provide a lock plate disassembly tool and method that allows for simple and convenient disassembly of the lock plate without slipping or damaging other parts, thereby reducing disassembly time and maintenance costs.

[0004] The present invention adopts the following technical solution:

[0005] A lock plate removal tool, comprising,

[0006] The left and right jaws are hinged by a first pin. The left jaw is also provided with a third and a fourth pin, and the right jaw is also provided with a second and a fifth pin. The first, second, third, fourth and fifth pins are parallel. The line connecting the second and fifth pins intersects the line connecting the third and fourth pins at the first pin. The distance from the first pin to the second, third, fourth and fifth pins is equal.

[0007] The left clamp block includes a flat section with a straight cutting edge at one end. The left clamp block also has a first straight groove. The left clamp block is rotatably connected to the right clamp handle through a second pin and is also slidably connected to a fourth pin through the first straight groove. A left clamp block clamping working surface is provided on the left clamp block and between the second pin and the flat section.

[0008] The right clamp block has a cylindrical section at one end and a second straight groove on it. The right clamp block is rotatably connected to the left clamp handle through the third pin and is also slidably connected to the fifth pin through the second straight groove.

[0009] When the left and right jaws rotate around the first pin and move closer to each other, the straight cutting edge of the flat part and the cylinder move closer to each other in sync.

[0010] Furthermore, both the left and right clamp handles have slots at one end and form a forked structure, with the left and right clamp blocks placed inside the slots.

[0011] Furthermore, the axis of the cylinder is parallel to the line connecting the third pin and the fifth pin.

[0012] Furthermore, the flat portion at one end of the left clamp block is curved.

[0013] Furthermore, the left clamp block has a tapered cross-section structure, and the tapering direction points from the connection point between the left clamp block and the second pin to the flat portion. The right clamp blocks all have tapered cross-section structures, and the tapering direction points from the connection point between the right clamp block and the third pin to the cylinder.

[0014] If the bolt end face used with the locking plate has a hole, the following method can be used for disassembly:

[0015] A method for removing a lock plate, using the aforementioned lock plate removal tool, includes the following steps:

[0016] Step 1: Insert the cylinder at one end of the right clamp into the end hole of the bolt;

[0017] Step 2: Insert the straight cutting edge of the flat part at one end of the left clamp into the gap between the locking plate and the part;

[0018] Step 3: Grip the left and right handles tightly at the ends away from the left and right jaw blocks, bringing them closer together. Use the straight cutting edge of the flat part to pry up the locking plate and insert it between the left and right jaw blocks, where it will be clamped by the working surfaces of the left and right jaw blocks.

[0019] Step 4: Pull out the locking piece along the end face of the cylinder that is detached from the bolt.

[0020] For bolts used with locking plates that have no holes on their end faces but have grooves on the circumferential surface of their heads, the following method can be used for disassembly:

[0021] A method for removing a lock plate, using the aforementioned lock plate removal tool, includes the following steps:

[0022] Step 1: Press the cylindrical surface of the right clamp block against the V-shaped groove on the outer circumferential surface of the bolt.

[0023] Step 2: Insert the straight cutting edge of the flat part at one end of the left clamp into the gap between the locking plate and the part;

[0024] Step 3: Grip the left and right handles tightly at the ends away from the left and right jaw blocks, bringing them closer together. Use the straight cutting edge of the flat part to pry up the locking plate and insert it between the left and right jaw blocks, where it will be clamped by the working surfaces of the left and right jaw blocks.

[0025] Step 4: Pull out the locking piece along the V-shaped groove on the outer surface of the cylinder detached from the bolt.

[0026] Compared with the prior art, the disassembly tool and disassembly method of the present invention have the following characteristics:

[0027] (1) The disassembly tool and disassembly method of the present invention will not damage the surrounding parts when disassembling the lock plate;

[0028] (2) The locking gasket removed by the present invention is intact and can continue to be used as an original component;

[0029] (3) The disassembly tool and disassembly method of the present invention can remove the lock plate efficiently and quickly (in three seconds);

[0030] (4) When the disassembly tool of the present invention is used, the left clamping block and the right clamping block always remain relatively parallel, thereby increasing the contact area between the clamping working surface of the left clamping block and the clamping working surface of the right clamping block and the clamping lock piece, improving the clamping friction, and making it less likely to slip when the lock piece is pulled out.

[0031] (5) The flat part is used in conjunction with the cylinder. With the cylinder positioned and used as a fulcrum, the flat part with a straight cutting edge (similar to a knife blade) is easy to insert into the gap of the locking piece. When the locking piece is pulled out, the cylinder slides along the hole or V-shaped groove at the end of the bolt to play a guiding role. It is especially suitable for operation in small spaces to avoid accidentally damaging other parts during the pulling process.

[0032] (6) The disassembly tool and disassembly method of the present invention are highly practical and convenient to operate on site.

[0033] The locking plate removal tool and method of this invention can remove the locking plate in just three seconds, leaving the locking washer and surrounding parts intact. The disassembly principle of this invention is simple and can be used to disassemble similar locking devices in various engines. Attached Figure Description

[0034] Figure 1 This is a schematic diagram showing the positions of the locking shims and locking plates in the engine;

[0035] Figure 2 This is a schematic diagram illustrating the principle of disassembling locking washers and locking plates using traditional methods and tools.

[0036] Figure 3 This is a schematic diagram of the bolt structure used in conjunction with locking washers and locking plates;

[0037] Figure 4 This is a partial schematic diagram of the lock plate disassembly tool in this invention;

[0038] Figure 5 This is an overall schematic diagram of the locking plate disassembly tool in this invention;

[0039] Figure 6 This is a schematic diagram illustrating the principle that the left and right clamping blocks in the lock plate disassembly tool of this invention always remain parallel during relative movement;

[0040] In the diagram, 1-left jaw; 2-right jaw; 3-left jaw block; 4-right jaw block; 5-flat part; 6-cylinder; 7-first pin; 8-second pin; 9-third pin; 10-fourth pin; 11-fifth pin. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0042] like Figure 1 As shown, this is a locking device commonly used in engines, including locking washers, bolts, and locking plates.

[0043] like Figure 2 As shown, the traditional method of removing the lock plate usually involves using a flat chisel and a hammer to knock it off. When removing the lock plate in the narrow operating space of the turbine support, it is easy to damage the graphite sealing assembly and other surrounding parts if you are not careful. In severe cases, the parts will be scrapped. The removed locking washer cannot be used due to the damage caused by the knocking and must be scrapped and replaced with a new locking washer.

[0044] like Figure 3 As shown, Figure 1 The bolt commonly used in the locking device shown has a round hole on the head end face and multiple V-shaped grooves on the circumferential surface of the head with axes parallel to the bolt axis.

[0045] like Figure 4 and Figure 5As shown, the lock plate removal tool includes a left clamp handle 1 and a right clamp handle 2 hinged together by a first pin 7. A third pin 9 and a fourth pin 10 are also provided on the left clamp handle 1, and a second pin 8 and a fifth pin 11 are also provided on the right clamp handle 2. The first pin 7, second pin 8, third pin 9, fourth pin 10, and fifth pin 11 are parallel. The line connecting the second pin 8 and the fifth pin 11 intersects the line connecting the third pin 9 and the fourth pin 10 at the first pin 7. The distances from the first pin 7 to the second pin 8, third pin 9, fourth pin 10, and fifth pin 11 are equal. One end of the left clamp block 3 includes a flat portion 5 with a straight cutting edge. The left clamp block 3 also has a first straight groove. The clamp block 3 is rotatably connected to the right clamp handle 2 via the second pin 8 and slidably connected to the fourth pin 10 via the first straight groove. A left clamp block clamping working surface is provided on the left clamp block 3 between the second pin 8 and the flat part 5. One end of the right clamp block 4 has a cylindrical body 6. A second straight groove is also provided on the right clamp block 4. The right clamp block 4 is rotatably connected to the left clamp handle 1 via the third pin 9 and slidably connected to the fifth pin 11 via the second straight groove. A right clamp block clamping working surface is provided on the right clamp block 4 between the third pin 9 and the cylindrical body 6. When the left clamp handle 1 and the right clamp handle 2 rotate around the first pin 7 and move closer to each other, the straight cutting edge of the flat part 5 and the cylindrical body 6 move closer to each other synchronously.

[0046] like Figure 5 The left clamp handle 1 and the right clamp handle 2 each have a slot and form a forked structure, with the left clamp block 3 and the right clamp block 4 placed inside the slot.

[0047] like Figure 4 The axis of cylinder 6 is parallel to the line connecting the third pin 9 and the fifth pin 11. The flat portion 5 at one end of the left clamp block 3 is curved. The shape of the flat portion 5 can be understood as a shovel, with a straight cutting edge at the end used to insert into the gap between the locking plate and the part and pry up the locking plate.

[0048] like Figure 4 As shown, the clamping force and lever arm of the lock plate removal tool can be adjusted by changing the positional relationship between the first pin 7, the second pin 8, the third pin 9, the fourth pin 10, and the fifth pin 11.

[0049] Both the left clamp block 3 and the right clamp block 4 are machined with a straight groove for sliding connection with the fourth pin 10 and the fifth pin 11, such as... Figure 6This diagram illustrates the principle that the left clamping block 3 and the right clamping block 4 remain parallel during the clamping process of the locking plate. In the diagram, A1, A2, A3, and A4 represent the positions of the second pin 8, the fourth pin 10, the third pin 9, and the fifth pin 11 at a certain moment, respectively. B1, B2, B3, and B4 represent the positions of the second pin 8, the fourth pin 10, the third pin 9, and the fifth pin 11 at the next moment (when the left clamping block 3 and the right clamping block 4 move closer to each other). Point O represents the first pin 7, OA1, OA... 2. OA3, OA4, OB1, OB2, OB3, and OB4 are all equal. A1A2, A3A4, B1B2, and B3B4 are parallel to each other. That is, the working surfaces of the left and right clamping blocks are always parallel and parallel to the bolt, maximizing the contact area when clamping the locking plate. The first and second straight grooves on the left clamping block 3 and the right clamping block 4 serve as sliding grooves for the pin, extending A1A2 to B1B2 and A3A4 to B3B4, thus maintaining parallelism. The left clamping block 3 and the second pin 8 have a clearance rotational fit, and the right clamping block 4 and the third pin 9 have a clearance rotational fit.

[0050] The flat portion 5 and the cylindrical body 6 at the ends of the left clamp block 3 and the right clamp block 4 cooperate with each other. The cylindrical body 6 serves as a fulcrum and a fixed end, while the flat portion 5 serves as a movable insertion end, resulting in a good effect of prying up the locking plate.

[0051] When disassembly is required, such as Figure 1 When removing the locking plate and locking washer as shown, use the 4.5mm diameter cylindrical hole on the bolt head end face. Insert one end of the locking plate removal tool with a 4mm diameter cylinder 6 into the cylindrical hole on the bolt end face. This prevents slippage when applying force. Insert the straight cutting edge of the flat part 5 at the other end into the gap between the locking plate and the part. Finally, clamp the left clamp 3 and right clamp 4 and pull out (along the direction away from the bolt's cylindrical hole) to open the locking plate. The whole process is convenient, quick, and versatile. When removing a locking plate that does not have a cylindrical hole on the bolt end face, use the V-shaped groove on the cylindrical surface of the cylinder 6 to position it against the circumferential surface of the bolt. Insert the straight cutting edge of the flat part 5 at the other end into the gap between the locking plate and the part. Finally, clamp and pull out (along the length of the V-shaped groove) to open the locking plate.

[0052] The locking washers removed using the above tools and methods are intact and can be reused as original parts, eliminating the need to replace them with new ones and thus reducing maintenance costs.

[0053] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A lock plate disassembly tool, characterized in that: include, The left clamp handle (1) and the right clamp handle (2) are hinged by the first pin (7). The left clamp handle (1) is also provided with the third pin (9) and the fourth pin (10). The right clamp handle (2) is also provided with the second pin (8) and the fifth pin (11). The first pin (7), the second pin (8), the third pin (9), the fourth pin (10) and the fifth pin (11) are parallel. The line connecting the second pin (8) and the fifth pin (11) intersects the line connecting the third pin (9) and the fourth pin (10) at the first pin (7). The distance from the first pin (7) to the second pin (8), the third pin (9), the fourth pin (10) and the fifth pin (11) is equal. The left clamp block (3) includes a flat part (5) with a straight cutting edge at one end. The left clamp block (3) also has a first straight groove. The left clamp block (3) is rotatably connected to the right clamp handle (2) through the second pin (8) and slidably connected to the fourth pin (10) through the first straight groove. The left clamp block (3) has a left clamp clamping working surface between the second pin (8) and the flat part (5). The right clamp block (4) has a cylindrical section (6) at one end and a second straight groove on the right clamp block (4). The right clamp block (4) is rotatably connected to the left clamp handle (1) through the third pin (9) and slidably connected to the fifth pin (11) through the second straight groove. The right clamp block (4) has a clamping working surface on the right clamp block (4) and between the third pin (9) and the cylindrical section (6). When the left clamp handle (1) and the right clamp handle (2) rotate around the first pin (7) and move closer to each other, the straight cutting edge of the flat part (5) and the cylinder (6) move closer to each other in sync. The left clamping block clamping working surface and the right clamping block clamping working surface are always parallel; The axis of the cylinder (6) is parallel to the line connecting the third pin (9) and the fifth pin (11); The left clamp (3) has a tapered cross section, and the tapering direction is from the connection point between the left clamp (3) and the second pin (8) to the flat part (5). The right clamp (4) also has a tapered cross section, and the tapering direction is from the connection point between the right clamp (4) and the third pin (9) to the cylinder (6).

2. The lock plate disassembly tool according to claim 1, characterized in that: The left clamp handle (1) and the right clamp handle (2) are both slotted and forked, with the left clamp block (3) and the right clamp block (4) placed inside the slots.

3. The lock plate disassembly tool according to claim 1, characterized in that: The flat portion (5) at one end of the left clamp (3) is curved.

4. A method for disassembling a locking plate, characterized in that: Using the lock plate disassembly tool as described in claim 1, the disassembly method includes the following steps: Step 1: Insert the cylinder (6) at one end of the right clamp block (4) into the end hole of the bolt; Step 2: Insert the straight cutting edge of the flat part (5) at one end of the left clamp block (3) into the gap between the lock plate and the part; Step 3: Hold the left handle (1) and the right handle (2) away from the left clamp block (3) and the right clamp block (4) so ​​that they are relatively close to each other. Use the straight cutting edge of the flat part (5) to pry up the locking piece and enter between the left clamp block (3) and the right clamp block (4) and be clamped by the working surface of the left clamp block and the working surface of the right clamp block. Step 4: Pull out the locking piece along the end face of the cylinder (6) that is detached from the bolt.

5. A method for disassembling a locking plate, characterized in that: Using the lock plate disassembly tool as described in claim 1, the disassembly method includes the following steps: Step 1: Place the cylindrical surface of the cylinder (6) at one end of the right clamp block (4) tightly against the V-shaped groove on the outer circumferential surface of the bolt; Step 2: Insert the straight cutting edge of the flat part (5) at one end of the left clamp block (3) into the gap between the lock plate and the part; Step 3: Hold the left handle (1) and the right handle (2) away from the left clamp block (3) and the right clamp block (4) so ​​that they are relatively close to each other. Use the straight cutting edge of the flat part (5) to pry up the locking piece and enter between the left clamp block (3) and the right clamp block (4) and be clamped by the working surface of the left clamp block and the working surface of the right clamp block. Step 4: Pull out the locking piece along the V-shaped groove on the outer surface of the cylinder (6) circumferentially away from the bolt.

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