An auxiliary device for disassembling the cylinder liner of a compressor used in EVA production.

Abstract

This utility model belongs to the field of compressor cylinder disassembly technology, specifically disclosing an auxiliary device for disassembling cylinder liners of compressors used in EVA production. It includes a fixing plate, screws, and a limiting unit. The fixing plate is fixed to the cylinder shaft sealing flange via through-hole bolts. Two screws pass through the fixing plate and are equipped with a nut and a gear. They are linked by a chain and a gear on a rotating shaft to achieve synchronous movement of the two screws. The limiting plate constrains the circumferential rotation of the screws, ensuring they only eject in a straight line. An arc-shaped plate with a rubber pad is provided at the end of the screws to increase the contact area and protect the cylinder liner surface. This invention addresses the problem of uneven force on the cylinder liner and scratches on the sealing surface caused by tilting with existing disassembly tools. In use, rotating the nut allows the two screws to synchronously and smoothly eject the cylinder liner without lateral force, avoiding damage to the sealing surface. It is suitable for non-destructive disassembly of compressor cylinder liners in EVA production.

Description

Technical Field

[0001] This utility model relates to the field of compressor cylinder disassembly technology, specifically to an auxiliary device for disassembling the cylinder liner of a compressor used in EVA production. Background Technology

[0002] In the production process of EVA products, the compressor starts from the start-up stage of the unit and continues throughout the entire continuous polymerization reaction. Its core function is to compress the raw material ethylene gas from a low-pressure state to the ultra-high pressure required for the polymerization reaction, continuously providing reaction raw materials for the high-pressure reactor. When the compressor cylinder experiences abnormal wear, scoring, severe abnormal noise, decreased sealing performance, or other system failures, or when periodic overhauls are required, the cylinder must be disassembled for inspection, repair, or replacement. The disassembly of the cylinder liner is a frequent and important operation. When disassembling the cylinder body, first remove the compressor cylinder shaft seal end cover (the shaft seal end cover is flanged to the compressor body), then remove the piston assembly inside the cylinder, and then remove the rear end cover of the compressor cylinder. After that, the cylinder liner itself can be easily removed.

[0003] However, sometimes cylinder liners cannot be easily removed. Specific reasons include: 1) aging and adhesion of the O-rings or sealant, causing the rubber ring to stick to the compressor's inner wall; 2) rust or corrosion on the metal surface, especially in humid or harsh environments, leading to electrochemical corrosion and seizing between different metals. The current method for disassembling cylinder liners involves the technician first soaking the liner in a penetrating loosening agent, then using a general-purpose tool, such as a rubber or plastic hammer, to tap the side of the end cover, slowly separating the liner from the cylinder, thus allowing the liner to be removed.

[0004] However, in actual operation, when disassembling the cylinder liners of some compressors with high precision requirements, the impact force of existing general tools is unevenly distributed. During the disassembly process, the cylinder liner may tilt, causing local jamming or damage to the sealing surface. As a result, the lateral force generated will scratch the precision surface of the cylinder liner, ultimately causing the entire cylinder assembly to fail to seal and become basically scrapped. Utility Model Content

[0005] The purpose of this utility model is to provide an auxiliary device for disassembling the cylinder liner of a compressor used in EVA production, so as to solve the problem that when using the existing general tools for pulling out cylinder liners, uneven force is easily generated, which causes the cylinder liner to tilt due to the lateral force, thereby scratching the cylinder liner sealing surface.

[0006] To achieve the above objectives, the basic solution provided by this utility model is as follows: A fixing plate is included, the fixing plate having a through hole for bolting a cylinder shaft sealing flange; two screws for ejecting the cylinder liner are movably inserted through the fixing plate; a nut is threaded onto each screw; each nut abuts against the outer side of the fixing plate; a gear is fixedly connected to each nut; a chain meshes between the two gears; a limiting unit for restricting the rotation of the screws is provided on the fixing plate; a rotating shaft is bearing-connected to the fixing plate; the rotating shaft is located between the two gears; a second gear is fixedly connected to the rotating shaft; and the second gear meshes with the chain.

[0007] The principle of this utility model is as follows: When it is necessary to disassemble the compressor cylinder liner, first remove the shaft seal end cover and take out the piston assembly inside the cylinder. Then, remove the rear end cover of the cylinder. Next, bolt the through hole of the fixing plate to the flange of the compressor cylinder shaft seal end. Then, the operator rotates the shaft, which drives the second gear to rotate. The second gear drives the two gears to rotate at the same speed through the drive chain, realizing the synchronous rotation of the two nuts. Since the two nuts abut against the fixing plate, and the circumferential rotation of the screw is constrained by the limiting unit, when the nuts rotate, the screw only... It can move linearly. As nut one continues to rotate, the two screws move towards the cylinder liner. The thrust is transmitted to the cylinder liner end face through the arc plate. Finally, the cylinder liner is pushed out. After the cylinder liner is completely removed, the shaft rotates in the opposite direction. The shaft drives gear two to rotate. Gear two drives two gears to rotate at the same speed through the drive chain. The two gears drive the two nuts one to rotate synchronously. Nut one rotates in its original position. The screws move linearly outward until the screws move outward to the appropriate position. Then, the bolts of the fixing plate and the compressor cylinder shaft sealing end are removed, and the fixing plate can be taken off.

[0008] The beneficial effects of this utility model are as follows: by bolting the fixing plate to the cylinder shaft sealing flange, the overall stable positioning of the device is achieved. At the same time, the double screw synchronous ejection structure is adopted, and with the linkage transmission of gear one, chain and gear two, the rotating shaft drives the two screws to rotate synchronously, ensuring that the cylinder liner is subjected to uniform force, without lateral force, preventing the cylinder liner from tilting, and avoiding scratches on the precision sealing surface of the cylinder liner.

[0009] Option 2, which is a preferred embodiment of the basic option, includes two limiting plates, both of which are fixedly connected to a fixed plate. Each of the two screws has a sliding groove on an adjacent side, and the two limiting plates are slidably connected to the two sliding grooves respectively. By setting the limiting plates, the two screws can be limited to prevent them from rotating during the rotation of nut one.

[0010] Option 3, which is a preferred option of Option 2, has an insertion hole at one end of the two screws located inside the cylinder. A connecting rod is slidably connected in each insertion hole, and an arc-shaped plate is provided at one end of each connecting rod. The arc-shaped plate can fit against the cylinder liner to increase the contact area with the cylinder liner, so that the ejection force is more evenly distributed.

[0011] Option 4, which is a preferred option of Option 3, includes screws in both of the sliding grooves for limiting the connecting rods; the screws can limit and fix the connecting rods to prevent the arc plate from falling off.

[0012] Option 5, which is a preferred option of Option 3, has a rubber pad at one end of the two arc-shaped plates that contacts the cylinder liner; the rubber pad is made of a flexible material, which can prevent the arc-shaped plates from rigidly contacting the inner wall of the cylinder liner and prevent scratching the surface of the cylinder liner.

[0013] Option 6, which is a preferred option of the basic option, has a nut 2 fixedly connected to the rotating shaft; the nut 2 makes it easier for the operator to rotate the rotating shaft. Attached Figure Description

[0014] Figure 1 This is a perspective view of the installation of an auxiliary device for disassembling the cylinder liner of a compressor used in EVA production, according to this utility model.

[0015] Figure 2 for Figure 1 A 3D view from another angle;

[0016] Figure 3 This is a perspective view of an auxiliary device for disassembling the cylinder liner of a compressor used in EVA production, according to this utility model.

[0017] Figure 4 for Figure 3 A 3D view from another angle.

[0018] The reference numerals in the accompanying drawings of the instruction manual include: 1. Fixing plate; 2. Through hole; 3. Screw; 4. Nut 1; 5. Gear 1; 6. Chain; 7. Shaft; 8. Gear 2; 9. Slide groove; 10. Limiting plate; 11. Connecting rod; 12. Arc plate; 13. Screw; 14. Nut 2. Detailed Implementation

[0019] The present invention will be further described in detail below through specific embodiments:

[0020] like Figures 1 to 4 As shown: An auxiliary device for disassembling the cylinder liner of a compressor used in EVA production includes a fixing plate 1. The fixing plate 1 has a through hole 2 for bolting the cylinder shaft sealing end flange. Since the compressor cylinder shaft sealing end flange itself is provided with bolts, the fixing plate 1 can be fixed to the cylinder shaft sealing end flange through the through hole 2.

[0021] Two screws 3 for ejecting the cylinder liner are movably threaded through the fixed plate 1. Each screw 3 is threaded with a nut 4, one side of which abuts against the outer side of the fixed plate 1. A gear 5 is fixedly connected to each nut 4, and a chain 6 meshes between the two gears 5. The fixed plate 1 is provided with a limiting unit for restricting the rotation of the screws 3. The limiting unit includes two limiting plates 10, both of which are fixedly connected to the fixed plate 1. The two limiting plates 10 are L-shaped, and each adjacent side of the two screws 3 has a sliding groove 9. 0 is slidably connected to two slide grooves 9 respectively; in order to reduce the friction during the sliding process, a ball can be embedded in one end of the limiting plate 10 located in the slide groove 9 so that the ball is slidably connected to the slide groove 9; or a ball can be embedded in the slide groove 9 so that the limiting plate 10 is slidably connected to the ball; a rotating shaft 7 is connected to the bearing on the fixed plate 1, the fixed plate 1 is fixedly connected to the outer ring of the bearing, and the rotating shaft 7 is fixedly connected to the inner ring of the bearing. The rotating shaft 7 is located between two gears 5, and a gear 8 is fixedly connected to the rotating shaft 7. The gear 8 meshes with the chain 6, and a nut 14 is provided on the rotating shaft 7.

[0022] Two screws 3 are provided with an insertion hole at one end inside the cylinder. A connecting rod 11 is slidably connected in each insertion hole. An arc plate 12 is provided at one end of each connecting rod 11. A rubber pad is provided at the end of the two arc plates 12 that contacts the cylinder liner. Screws 13 for limiting the connecting rod 11 are provided in both sliding grooves 9. More specifically, a threaded hole 1 is provided between the insertion hole and the sliding groove 9, and a threaded hole 2 is provided on the connecting rod. First, the threaded hole 1 and the threaded hole 2 are aligned, and then fixed by the screws 13.

[0023] The implementation method of this embodiment is as follows: When it is necessary to disassemble the compressor cylinder liner, first remove the shaft seal end cover (such as...). Figure 1 ), and remove the piston assembly inside the cylinder, then remove the cylinder rear end cover (such as Figure 2 Then, the through hole 2 of the fixing plate 1 is bolted to the flange of the compressor cylinder shaft seal end;

[0024] Next, the operator rotates nut 14 with a wrench, which in turn drives shaft 7 to rotate (when a manual wrench is too difficult, an electric wrench can also be used; model: Bosch electric wrench GDS18V-400). Shaft 7 drives gear 8 to rotate, and gear 8 drives two gears 5 to rotate at the same speed via drive chain 6, achieving synchronous rotation of the two nuts 4. Since the two nuts 4 abut against the fixing plate 1, and the circumferential rotation of screw 3 is constrained by the limiting plate 10, when nut 4 rotates, screw 3 only rotates... It can move in a straight line. As the nut 14 continues to rotate, the two screws 3 move towards the cylinder liner. The thrust is transmitted to the cylinder liner end face through the arc plate 12. The nut 24 is rotated at a constant speed. The arc plate 12 pushes out part of the cylinder liner. When the cylinder liner is disassembled to 80% of its length, the cylinder liner is protected by hoisting equipment. Then the nut 24 is rotated to remove the cylinder liner from the compressor body. The disassembled cylinder liner is placed stably in a safe position for subsequent maintenance and repair work.

[0025] After the cylinder liner is completely removed, the reverse rotation of nut 14 drives the shaft 7 to rotate. The shaft 7 drives gear 8 to rotate. Gear 8 drives two gears 5 to rotate at the same speed through the drive chain 6. The two gears 5 drive the two nuts 4 to rotate synchronously. Since the limit plate 10 limits the nut 4, when the reverse rotation of nut 14 is performed, the nut 4 can only rotate in its original position. The screw 3 moves outward in a straight line until the screw 3 moves outward to the appropriate position. Then, the connecting bolts between the fixing plate 1 and the compressor cylinder shaft end flange are removed, and the fixing plate 1 can be removed.

[0026] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A device for assisting in disassembling a cylinder liner of a compressor used in EVA production, characterized in that, The device includes a fixed plate (1), which has a through hole (2) for bolting the cylinder shaft sealing flange. Two screws (3) for ejecting the cylinder liner are movably inserted through the fixed plate (1). Each screw (3) is threaded with a nut (4). Each nut (4) abuts against the outside of the fixed plate (1). Each nut (4) is fixedly connected with a gear (5). A chain (6) meshes between the two gears (5). The fixed plate (1) has a limiting unit for restricting the rotation of the screws (3). A rotating shaft (7) is connected to the fixed plate (1) by a bearing. The rotating shaft (7) is located between the two gears (5). A gear (8) is fixedly connected to the rotating shaft (7). The gear (8) meshes with the chain (6).

2. A device according to claim 1, characterized in that, The limiting unit includes two limiting plates (10), both of which are fixedly connected to the fixing plate (1). Each of the two screws (3) has a sliding groove (9) on one side adjacent to each other, and the two limiting plates (10) are slidably connected to the two sliding grooves (9) respectively.

3. The auxiliary device for disassembling the cylinder liner of the compressor used in EVA production according to claim 2, characterized in that, The two screws (3) are provided with an embedding hole at one end in the cylinder, and a connecting rod (11) is slidably connected in each embedding hole. An arc plate (12) is provided at one end of each connecting rod (11).

4. The auxiliary device for disassembling the cylinder liner of the compressor used in EVA production according to claim 3, characterized in that, Both of the grooves (9) are provided with screws (13) for limiting the connecting rod (11).

5. The auxiliary device for disassembling the cylinder liner of the compressor used in EVA production according to claim 3, characterized in that, A rubber pad is provided at the end of the two arc-shaped plates (12) that are in contact with the cylinder liner.

6. A device according to claim 1, characterized in that, Nut 2 (14) is fixedly connected to the rotating shaft (7).

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