Melt valve guide sleeve removal tool

Abstract

This utility model belongs to the field of chemical equipment technology, specifically relating to a tool for disassembling a melt valve guide sleeve. It includes a bracket, a threaded screw, a support base, and sliding blocks. The threaded screw passes through a through hole at the center of the top of the bracket and is axially fixed to the bracket by a locking nut. The bottom end of the threaded screw has a tapered end, and the support base is fitted around the tapered end. The support base has a two-layer structure, with sliding blocks symmetrically arranged along the axis of the tapered end between the two layers. Each sliding block has a movable through hole through which a fixing nut passes, detachably fixing the sliding block to the lower layer of the support base. The sliding block design allows for adaptation to guide sleeve grooves of different widths; it also replaces point contact with surface contact hard support, eliminating the risk of scratches on the inner wall of the guide sleeve; furthermore, by constructing a dynamic centering mechanism, it controls the axial deviation of the pulling force, preventing the risk of breakage caused by off-center loading.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a tool for disassembling the guide sleeve of a melt valve. Background Technology

[0002] As core equipment in fields such as chemical fiber and engineering plastics processing, melt valves have guide sleeves that are subjected to high temperatures (300-400℃), high pressures (20-40MPa), and corrosive melt environments (such as nylon 66 melt) for extended periods. Under extreme conditions, the guide sleeve and valve body form a high-strength bonding interface due to thermal adhesion, requiring overcoming multiple challenges during disassembly, including thermal stress adhesion and surface bonding caused by media corrosion. However, traditional disassembly methods often employ three-jaw hook-like tools, using the jaws to hook into the grooves on the inner wall of the guide sleeve and apply force to pull it out. This method has the following significant drawbacks: First, the soft connection structure between the jaws and the handle leads to uneven force application, making it difficult to stably hold the guide sleeve, and slippage easily occurs when the jaw size does not match the groove. Second, the jaws directly contact the inner wall of the guide sleeve, easily causing surface scratches during operation and compromising the melt flow sealing. Third, existing tools are mostly non-standard designs with poor versatility, unable to adapt to different specifications of guide sleeves, resulting in low maintenance efficiency and high costs. Therefore, there is an urgent need to develop a specialized disassembly tool that is compact, easy to operate, and can avoid damaging the guide sleeve, in order to overcome the above problems. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a melt valve guide sleeve disassembly tool. The sliding block design can adapt to guide sleeve grooves of different widths. At the same time, the surface contact hard support replaces the point contact form of the traditional claw, eliminating the risk of scratching the inner wall of the guide sleeve. In addition, by constructing a dynamic centering mechanism, the axial deviation of the pulling force is controlled, eliminating the risk of breakage caused by off-center loading.

[0004] This utility model is achieved using the following technical solution:

[0005] The aforementioned melt valve guide sleeve disassembly tool includes a bracket, a threaded screw, a support base, and a sliding block. The bracket is a frame structure with an open bottom. The threaded screw passes through a through hole at the center of the top of the bracket and is axially fixed to the bracket by a locking nut. The top of the threaded screw is provided with a wrench clamping part. The bottom of the threaded screw is provided with an annular step and a conical end in sequence. The support base is sleeved around the conical end. The support base has an upper and lower two-layer structure. Between the two layers of the support base, there is a sliding block symmetrically arranged along the axis of the conical end. The sliding block has a movable through hole. A fixing nut passes through the movable through hole to detachably fix the sliding block to the lower layer of the support base. The top of the support base is flush with the lower end face of the annular step. A shaft retaining ring is sleeved around the annular step to axially limit the support base.

[0006] The wrench clamping part has a square head structure, which is used to adapt to the wrench clamping force.

[0007] The outer diameter of the annular step is smaller than the outer diameter of the main body section of the threaded screw.

[0008] The number of sliding blocks is two.

[0009] The bracket is a U-shaped frame, including a top horizontal plate and vertical plates symmetrically connected to both sides of the top horizontal plate.

[0010] The lower end of the vertical plate forms an opening structure.

[0011] The working principle of the melt valve guide sleeve disassembly tool is as follows:

[0012] In its initial state, the sliding block is secured to the lower structure of the support chassis by a fixing nut, retracting laterally. During use, the support chassis is inserted into the guide sleeve, with the open end of the bracket positioned on the molten valve flange surface, providing stable support. After loosening the fixing nut, a tool (such as a screwdriver) is used to apply lateral force along the sliding block's movable through-hole, causing the block to expand outwards and abut against the concave mating surface of the guide sleeve. The fixing nut is then tightened to lock the block's position. Subsequently, a wrench is used to grip the square-headed structure at the top of the threaded screw, rotating the screw clockwise. The tapered end of the screw simultaneously presses down on the support chassis, causing the guide sleeve to move synchronously via the sliding block on the support chassis, ultimately separating the guide sleeve from the valve body. During this process, the shaft retaining ring restricts the axial movement of the support chassis through an annular step, ensuring effective transmission of disassembly force; the symmetrical structure of the U-shaped bracket, through the contact between the vertical plate and the flange, balances the lateral force generated during screw rotation, preventing overall device misalignment.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] The melt valve guide sleeve disassembly tool of this utility model consists of a laterally adjustable clamping assembly formed by a sliding block and a fixed nut. Utilizing the lateral adjustment margin of the movable through hole, it adapts to guide sleeve grooves with a width of 3-8mm. Simultaneously, it replaces the point contact form of traditional claws with a surface-contact hard support, avoiding slippage under force and eliminating the risk of scratches on the inner wall of the guide sleeve through the uniform distribution of contact stress. Furthermore, a dynamic centering mechanism is constructed through the coaxial layout of the threaded screw, bracket, and support chassis, controlling the axial deviation of the pulling force within ±0.1mm, ensuring balanced force on the guide sleeve and eliminating the risk of breakage caused by uneven loading. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the initial state of the melt valve guide sleeve disassembly tool described in this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the melt valve guide sleeve disassembly tool described in this utility model during use;

[0017] Figure 3 A top view of the structure supporting the chassis, sliding block, and fixing nut assembly;

[0018] Figure 4 A schematic diagram of the structure supporting the chassis;

[0019] Figure 5 This is a schematic diagram of the structure of a threaded lead screw;

[0020] In the diagram: 1. Bracket; 2. Lead screw; 3. Support base; 4. Sliding block; 5. Locking nut; 6. Wrench clamp; 7. Annular step; 8. Conical end; 9. Movable through hole; 10. Fixing nut; 11. Shaft retaining ring. Detailed Implementation

[0021] To make the objectives and technical solutions of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0022] Example 1

[0023] like Figure 1-5 As shown, the melt valve guide sleeve disassembly tool includes a bracket 1, a threaded screw 2, a support base 3, and a sliding block 4. The bracket 1 is a frame structure with an open bottom. The threaded screw 2 passes through a through hole at the center of the top of the bracket 1 and is axially fixed to the bracket 1 by a locking nut 5. The top of the threaded screw 2 is provided with a wrench clamping part 6. The bottom of the threaded screw 2 is provided with an annular step 7 and a conical end 8 in sequence. The support base 3 is sleeved around the conical end 8. The support base 3 is a two-layer structure. The two layers of the support base 3 are provided with sliding blocks 4 symmetrically arranged along the axis of the conical end 8. The sliding block 4 is provided with a movable through hole 9. The fixing nut 10 passes through the movable through hole 9 to detachably fix the sliding block 4 to the lower layer of the support base 3. The top of the support base 3 is flush with the lower end face of the annular step 7. The annular step 7 is sleeved around the shaft retaining ring 11.

[0024] The wrench clamping part 6 is a square head structure.

[0025] The outer diameter of the annular step 7 is smaller than the outer diameter of the main body section of the threaded screw 2.

[0026] The number of sliding blocks 4 is two.

[0027] The bracket 1 is a U-shaped frame, including a top horizontal plate and vertical plates symmetrically connected to both sides of the top horizontal plate.

[0028] The lower end of the vertical plate forms an opening structure.

[0029] The specific steps for using it are as follows:

[0030] Insert the support base 3 vertically into the guide sleeve. The vertical plate at the open end of the bracket 1 is placed stably on the surface of the molten metal valve flange, forming multi-point support. Loosen the fixing nut 10, insert a screwdriver into the movable through hole 9 of the sliding block 4, and pry the sliding block 4 outward so that its end presses against the concave mating surface of the guide sleeve. Tighten the fixing nut 10 to lock the block in position. Then, use a wrench to hold the square head structure of the wrench clamping part 6 at the top of the threaded screw 2 and rotate the wrench clockwise. As the screw moves downward, the tapered end 8 pushes the support base 3 downward in sync, pulling the guide sleeve out until it is completely detached from the valve body. After the guide sleeve is disassembled, loosen the fixing nut 10, return the sliding block 4 to its initial position, and clean the residual molten metal from the surfaces of all components for future use.

Claims

1. A melt valve guide sleeve disassembly tool characterized by, The system includes a bracket (1), a threaded screw (2), a support base (3), and a sliding block (4). The bracket (1) is a frame structure with an open bottom. The threaded screw (2) passes through a through hole at the center of the top of the bracket (1) and is axially fixed to the bracket (1) by a locking nut (5). The top of the threaded screw (2) is provided with a wrench clamping part (6). The bottom of the threaded screw (2) is provided with an annular step (7) and a tapered end (8). The support base (3) is sleeved around the tapered end (8). The support base (3) has a two-layer structure. Between the two layers of the support base (3) is a sliding block (4) symmetrically arranged along the axis of the conical end (8). The sliding block (4) has a movable through hole (9). The fixing nut (10) passes through the movable through hole (9) to detachably fix the sliding block (4) to the lower layer of the support base (3). The top of the support base (3) is flush with the lower end face of the annular step (7). The annular step (7) is fitted with a shaft retaining ring (11) around its perimeter.

2. The melt valve guide sleeve removal tool of claim 1 wherein, The wrench clamping part (6) is a square head structure.

3. The melt valve guide sleeve removal tool of claim 1 wherein, The outer diameter of the annular step (7) is smaller than the outer diameter of the main body section of the threaded screw (2).

4. The melt valve guide sleeve removal tool of claim 1 wherein, The number of sliding blocks (4) is two.

5. The melt valve guide sleeve removal tool of claim 1 wherein, The bracket (1) is a U-shaped frame, including a top horizontal plate and vertical plates symmetrically connected to both sides of the top horizontal plate.

6. The melt valve guide sleeve removal tool of claim 5 wherein, The lower end of the vertical plate forms an opening structure.

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