Dismantling tool for guide copper bush of lifting hydraulic cylinder of supporting roller of medium plate rolling mill

Abstract

The utility model discloses a dismantling tool for a guide copper bush of a lifting hydraulic cylinder of a supporting roller of a medium plate mill, and belongs to the technical field of steel rolling machinery maintenance. The tool comprises a supporting plate, a lead screw, a guide seat, an adjusting bolt, a positioning clamping block and the like. The guide base is of a concentric circle structure formed by a circular bottom plate and an annular side plate, and after the guide base is inserted into the cylinder barrel, an arc-shaped positioning clamping block is transversely pushed through an adjusting bolt to clamp the inner wall of the copper sleeve. By means of the lead screw nut transmission principle, the nut at the upper end is screwed to generate axial tension, and the copper bush is pulled out stably. The tool adopts a concentric circle guide seat and arc-shaped clamping block design, so that the inner wall of the cylinder barrel is prevented from being scratched; and double lower end nuts are interlocked to prevent falling, so that the operation stability is ensured. Compared with a traditional electric welding cutting method, nondestructive dismantling is achieved, the single-time operation time is shortened, the overhaul efficiency is improved, and the damage risk and the maintenance cost of the cylinder barrel are remarkably reduced.

Description

Technical Field

[0001] This utility model belongs to the field of steel rolling machinery maintenance technology, specifically relating to a tool for removing the guide copper sleeve of the hydraulic cylinder for lifting the support roll of a medium plate rolling mill. It is used to solve the problems of difficulty in removing the guide copper sleeve inside the hydraulic cylinder and the easy damage to the cylinder by traditional methods. Background Technology

[0002] During the operation of the medium plate rolling mill, the guide copper sleeve of the hydraulic cylinder for lifting the support roll is prone to wear due to the long-term reciprocating friction of the plunger rod. This causes the fit clearance to exceed the allowable range, leading to plunger rod misalignment, seal damage, and oil leakage. In severe cases, it can even affect the normal operation of the hydraulic cylinder, requiring replacement during a major overhaul. Traditional removal methods rely on electric welding and cutting, which requires first locating the cutting point, then melting the copper sleeve at high temperature, and finally breaking and removing the fragments by hammering or prying, followed by cleaning up residual welding slag. This process takes 2-3 hours and has significant drawbacks: the high temperature of welding and cutting can easily cause annealing or deformation of the cylinder inner wall; hammering may cause the end to crack; and the quality of operation is highly dependent on the welder's skill. Previous attempts to improve the process, such as hydraulic jacking tools, are prone to causing indentations due to the need to set support points on the cylinder inner wall, while general-purpose pullers suffer from uneven force application and a success rate of less than 50% due to the lack of compatible positioning components. Therefore, there is an urgent need for a specialized tool that can achieve non-destructive removal, efficient operation, adaptability to different specifications of copper sleeves, and standardized operation to solve the problems of low efficiency, high risk of damage, and high technical dependence of traditional methods. Utility Model Content

[0003] This utility model addresses the above-mentioned problems by providing a tool for removing the guide copper sleeve of the hydraulic cylinder for lifting the support roll of a medium plate rolling mill.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a tool for removing the guide copper sleeve of a hydraulic cylinder for lifting support rolls in a medium plate rolling mill, comprising a support plate, a spacer at the lower end of the support plate, a through hole in the center of the support plate, a lead screw vertically passing through the through hole, an upper nut connected to the lead screw, the upper nut resting on the upper side of the support plate, a lower nut on the lead screw, a guide seat resting on the lower nut, the guide seat comprising a guide seat base plate and a guide seat side plate, multiple adjusting bolts horizontally passing through the guide seat side plate, the adjusting bolts passing outward from the lead screw as the center, and a positioning block connected to the end of the adjusting bolt.

[0005] Furthermore, the guide seat base plate is circular, the guide seat side plate has an annular cross-section, the circle formed by the guide seat base plate and the guide seat side plate is concentric, a lead screw is inserted at the center of the guide seat base plate, and the guide seat side plate is perpendicularly mounted on the guide seat base plate; by setting the guide seat base plate to be circular, the inner wall will not be damaged when the guide seat is inserted into the cylinder, and the guide seat side plate is set to an annular side plate, which can also more evenly set multiple positioning blocks.

[0006] Furthermore, the radius of the outer circle of the guide seat side plate is smaller than the radius of the guide seat base plate, and the edge of the guide seat base plate extends out of the guide seat side plate to form the bottom edge of the guide seat. The lower side of the positioning block abuts against the bottom edge of the guide seat. By setting the bottom edge of the guide seat to abut against the positioning block, the adjusting bolt and the positioning block will not shift or break due to excessive force when the copper sleeve is pulled out.

[0007] Furthermore, the upper end of the guide seat side plate is provided with a guide seat top edge, which extends outward from the lead screw as the center. The edge of the guide seat top edge is flush with the edge of the guide seat bottom edge in the vertical direction. The guide seat top edge, the guide seat side plate, and the guide seat bottom edge form a guide seat side groove, and the positioning block is slidably connected in the guide seat side groove. By setting the guide seat side groove, the position of the positioning block is limited, preventing the positioning block from shifting vertically when the copper sleeve is removed.

[0008] Furthermore, the end face of the positioning block away from the lead screw is arc-shaped, and the arc of the end face is the same as the arc of the bottom edge of the guide seat. By limiting the arc of the end face of the positioning block, the guide seat is inserted into the cylinder so that the end face of the positioning block is flush with the bottom edge of the guide seat, preventing damage to the inner wall of the cylinder. At the same time, the arc surface can fit more closely to the lower edge of the copper sleeve, and the force-bearing area is larger when the copper sleeve is removed.

[0009] Furthermore, the spacer has an annular cross-section, and its lower end abuts against the upper end of the cylinder.

[0010] Furthermore, there are two lower end nuts; by providing two lower end nuts, the two nuts are locked together when under force, preventing them from falling off the lead screw during disassembly.

[0011] Furthermore, the multiple adjusting bolts are evenly distributed around the lead screw; by evenly distributing the adjusting bolts, the force applied when removing the copper sleeve is more uniform.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. Non-destructive disassembly, ensuring cylinder integrity: The concentric circle design of the guide seat (circular base plate and annular side plate) ensures that the tool does not make hard contact with the inner wall when inserted into the cylinder, avoiding scratches; the end face of the positioning block adopts an arc structure consistent with the bottom edge of the guide seat, increasing the contact area with the copper sleeve, evenly distributing the tensile force, and preventing local stress concentration from damaging the copper sleeve or the inner wall of the cylinder.

[0014] 2. Efficient operation and shortened maintenance time: Utilizing the screw and nut transmission principle, continuous axial tension can be generated by tightening the upper nut. The single disassembly time is shortened from the traditional 2-3 hours to 20-30 minutes. It can quickly adapt to copper bushings of different diameters, reducing tool adjustment time.

[0015] 3. Standardized operation and reduced reliance on technology: The tool assembly process is clear (insert guide seat → adjust the clip → install the spacer → tighten the nut), which does not require welders or special skills. Ordinary maintenance personnel can complete the operation after simple training; the mechanical transmission process is controllable, the success rate is improved, and the risk of cylinder scrapping due to operational errors is significantly reduced. Attached Figure Description

[0016] Figure 1 This is a front sectional view of the present invention:

[0017] Figure 2 This is a top view of the cross-section at point AA of this utility model;

[0018] Figure 3 This is a top view of the present invention:

[0019] Figure 4 This is a schematic diagram illustrating the use of this utility model;

[0020] In the diagram, 1-support plate, 2-lead screw, 3-upper nut, 4-lower nut, 5-guide seat, 501-guide seat base plate, 502-guide seat bottom edge, 503-guide seat side plate, 504-guide seat top edge, 505-guide seat side groove, 6-adjusting bolt, 7-positioning block, 8-spacer, 9-cylinder, 10-copper sleeve. Detailed Implementation

[0021] A tool for removing the guide copper sleeve of a hydraulic cylinder for lifting support rolls in a medium plate rolling mill includes a support plate 1. A spacer 8 is provided at the lower end of the support plate 1. The spacer 8 has an annular cross-section and its lower end abuts against the upper end of a cylinder 9. A through hole is provided in the center of the support plate 1, and a lead screw 2 is vertically inserted through the through hole. An upper nut 3 is screwed onto the lead screw 2 and rests on the upper side of the support plate 1. A lower nut 4 is provided on the lead screw 2 and is screwed onto the lead screw 2 near its lower end. There are two lower nuts 4, so that the two nuts lock together when under force to prevent them from falling off the lead screw 2 during disassembly.

[0022] A guide seat 5 is mounted on the lower end nut 4. The guide seat 5 includes a guide seat base plate 501 and a guide seat side plate 503. The guide seat base plate 501 is circular to prevent damage to the inner wall when the guide seat 5 is inserted into the cylinder 9. The guide seat side plate 503 has an annular cross-section, allowing for more even placement of multiple positioning blocks 7. The circles formed by the guide seat base plate 501 and the guide seat side plate 503 are concentric. The radius of the outer circle of the guide seat side plate 503 is smaller than the radius of the guide seat base plate 501. The guide seat side plate 503 is perpendicular to the guide seat base plate 501. The edge of the guide seat base plate 501 extends beyond the guide seat side plate 503 to form the guide seat bottom edge 502. The lower side of the positioning block 7 abuts against the guide seat bottom edge. 502, so that the adjusting bolt 6 and the positioning block 7 will not shift or break due to excessive force when the copper sleeve 10 is pulled out. The upper end of the guide seat side plate 503 is provided with a guide seat top edge 504. The guide seat top edge 504 extends outward with the lead screw 2 as the center. The edge of the guide seat top edge 504 is flush with the edge of the guide seat bottom edge 502 in the vertical direction. The guide seat top edge 504, the guide seat side plate 503 and the guide seat bottom edge 502 form a guide seat side groove 505. The positioning block 7 is slidably connected in the guide seat side groove 505. By setting the guide seat side groove 505, the position of the positioning block 7 is limited to prevent the positioning block 7 from shifting in the vertical direction when the copper sleeve 10 is removed.

[0023] A lead screw 2 is inserted through the center of the guide seat base plate 501. Four adjusting bolts 6 are horizontally inserted through the guide seat side plate 503. The four adjusting bolts 6 are evenly distributed around the lead screw 2 to make the force applied when removing the copper sleeve 10 more even. The adjusting bolts 6 extend outward from the lead screw 2, and the ends of the adjusting bolts 6 are connected to positioning blocks 7. The length of the positioning blocks 7 extending out of the guide seat side groove 505 can be changed by rotating the adjusting bolts 6. The end face of the positioning blocks 7 away from the lead screw 2 is arc-shaped, and the arc of the end face is the same as the arc of the bottom edge of the guide seat 502. By limiting the arc of the end face of the positioning blocks 7, the guide seat 5 is inserted into the cylinder 9 so that the end face of the positioning blocks 7 is flush with the bottom edge of the guide seat 502, preventing damage to the inner wall of the cylinder 9. At the same time, the arc surface can fit more closely to the lower edge of the copper sleeve 10, and the force-bearing area is larger when removing the copper sleeve 10.

[0024] In use, insert the guide seat 5 vertically into the hydraulic cylinder barrel 9, and move it downwards until the top edge 504 of the guide seat is lower than the lower end face of the copper sleeve 10. Simultaneously ensure that the guide seat 5 and the cylinder barrel 9 are aligned to avoid uneven force on the locking block due to misalignment. Simultaneously rotate the four adjusting bolts 6 to push the positioning locking block 7 outwards horizontally until its arc-shaped end face approaches but does not contact the inner wall of the copper sleeve 10. Limit the vertical displacement of the locking block through the side groove 505 of the guide seat to ensure that the locking block only extends and retracts horizontally. Place the spacer 8 at the top of the cylinder barrel 9, with the lower end of the spacer 8 abutting against the cylinder barrel 9, and tighten the nut 3 at the upper end of the screw 2. Use a wrench to continuously rotate the nut, generating axial tension through the threaded transmission between the screw 2 and the nut. First, make the upper part of the positioning locking block 7 abut against the lower end of the copper sleeve 10, and then gradually and smoothly pull out the guide copper sleeve 10. During operation, observe the force on the screw 2. If the resistance increases suddenly, fine-tune the nut in the opposite direction to release stress before continuing to tighten. After removing the copper sleeve 10, rotate the adjusting bolt 6 in the opposite direction to retract the positioning block 7, and remove the entire tool from the cylinder 9. Check the inner wall of the cylinder 9 for damage, confirming that there are no scratches or deformations.

Claims

1. A tool for removing the guide copper sleeve of a hydraulic cylinder for lifting support rolls in a medium plate rolling mill, characterized in that, Includes a support plate (1), a spacer (8) at the lower end of the support plate (1), a through hole in the center of the support plate (1), a screw rod (2) vertically passing through the through hole, an upper nut (3) connected to the screw rod (2), the upper nut (3) resting on the upper side of the support plate (1), a lower nut (4) on the screw rod (2), a guide seat (5) resting on the lower nut (4), the guide seat (5) includes a guide seat base plate (501) and a guide seat side plate (503), multiple adjusting bolts (6) horizontally passing through the guide seat side plate (503), the adjusting bolts (6) passing outward with the screw rod (2) as the center, and a positioning block (7) connected to the end of the adjusting bolts (6).

2. The tool for removing the guide copper sleeve of the hydraulic cylinder for lifting the support roll of a medium plate rolling mill according to claim 1, characterized in that, The guide seat base plate (501) is circular, the guide seat side plate (503) has an annular cross-section, the circle formed by the guide seat base plate (501) and the guide seat side plate (503) is concentric, a lead screw (2) is inserted at the center of the guide seat base plate (501), and the guide seat side plate (503) is vertically mounted on the guide seat base plate (501).

3. The tool for removing the guide copper sleeve of the hydraulic cylinder for lifting the support roll of a medium plate rolling mill according to claim 2, characterized in that, The radius of the outer circle of the guide seat side plate (503) is smaller than the radius of the guide seat bottom plate (501). The edge of the guide seat bottom plate (501) extends out of the guide seat side plate (503) to form the bottom edge (502) of the guide seat. The lower side of the positioning block (7) abuts against the bottom edge (502) of the guide seat.

4. The tool for removing the guide copper sleeve of the hydraulic cylinder for lifting the support roll of a medium plate rolling mill according to claim 3, characterized in that, The upper end of the guide seat side plate (503) is provided with a guide seat top edge (504). The guide seat top edge (504) extends outward with the lead screw (2) as the center. The edge of the guide seat top edge (504) is flush with the edge of the guide seat bottom edge (502) in the vertical direction. The guide seat top edge (504), the guide seat side plate (503) and the guide seat bottom edge (502) form a guide seat side groove (505). The positioning block (7) is slidably connected in the guide seat side groove (505).

5. The tool for removing the guide copper sleeve of the hydraulic cylinder for lifting the support roll of a medium plate rolling mill according to claim 4, characterized in that, The end face of the positioning block (7) away from the lead screw (2) is arc-shaped, and the arc of the end face is the same as the arc of the bottom edge (502) of the guide seat.

6. The tool for removing the guide copper sleeve of the hydraulic cylinder for lifting the support roll of a medium plate rolling mill according to claim 5, characterized in that, The spacer (8) has an annular cross-section, and the lower end of the spacer (8) abuts against the upper end of the cylinder (9).

7. The tool for removing the guide copper sleeve of the hydraulic cylinder for lifting the support roll of a medium plate rolling mill according to claim 6, characterized in that, The lower end nut (4) is provided in two parts.

8. The tool for removing the guide copper sleeve of the hydraulic cylinder for lifting the support roll of a medium plate rolling mill according to claim 6, characterized in that, The multiple adjusting bolts (6) are evenly distributed around the lead screw (2).

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