Threaded sealing structure for rod head of oil cylinder of oversize pile driving barge

Abstract

The utility model discloses an oil cylinder rod head thread sealing structure of a super-huge pile driving barge, which adopts a combined sealing form that a piston rod and a rod head are in axial vertical thread connection, a transition plate is arranged in a gap at the joint, and a rod head sealing flange is vertically connected through a screw, so that good sealing of a connecting and matching surface of the rod head and the piston rod is realized. Welding is not needed, meanwhile, O-shaped ring sealing grooves are prevented from being machined in the oversized rod head and the piston rod of the oversized pile driving barge oil cylinder, manufacturing cost is reduced, the transition plate and the rod head sealing flange can be detached and replaced at any time, maintenance is convenient, and compared with a sealing mode that sealing grooves are directly machined in the rod head and the piston rod, maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinder sealing, and more specifically, to a thread sealing structure for an oil cylinder rod head of an extra-large pile-driving ship. Background Art

[0002] The axial connection between the piston rod and the rod head is mostly welded. The welded structure does not have a good anti-fatigue effect and is prone to fatigue failure and fracture. The threaded connection can effectively alleviate fatigue failure, but it cannot achieve a good sealing effect. Based on the advantages and disadvantages of the axial connection between the piston rod and the rod head, in the existing scheme, the axial vertical threaded connection of the piston rod of the rod head of the super-large oil cylinder is rarely used, and there is no mature application case for the sealing structure of the threaded connection. Specifically, there are the following disadvantages: ① The welded structure has poor anti-fatigue effect, and the weld is prone to cracking under various loads. ② The cost of using a welded structure at the rod head piston rod connection of a super-large oil cylinder is too high. Utility Model Content

[0003] The utility model aims to provide a threaded sealing structure for a rod head of an extra-large pile-driving ship oil cylinder, so as to solve the technical problem of poor sealing effect of the axial vertical connection between the rod head and the piston rod of the extra-large oil cylinder in the prior art.

[0004] In order to achieve these purposes and other advantages according to the utility model, a threaded sealing structure for the rod head of an oil cylinder of an extra-large pile-driving ship is provided, wherein the piston rod and the rod head are axially perpendicular and threadedly connected, and at the threaded connection, a plane groove is processed on the side of the rod head facing the piston rod, the plane groove is matched with the end face of the piston rod and is spaced to form a gap, and a transition plate is provided in the gap for transition connection, the transition plate is an annular plate structure and is sleeved on the corresponding position of the end of the piston rod, the outer diameter of the transition plate is larger than the outer diameter of the end of the piston rod and a connecting portion is formed at the exceeding part, a screw hole is provided on the side of the connecting portion facing the piston rod, a rod head sealing flange is fitted on the end of the piston rod on the side of the connecting portion facing away from the rod head, the rod head sealing flange and the connecting portion are fixedly connected by screws, a first sealing ring is provided between the rod head sealing flange and the end of the piston rod, a second sealing ring is provided between the rod head sealing flange and the connecting portion, and a third sealing ring is provided between the transition plate and the plane groove, so as to form sealed connections respectively.

[0005] Preferably, the outer diameter of the rod head sealing flange gradually increases along the axial direction from the piston rod to the rod head, and the outer diameters of the rod head sealing flange and the transition plate on the side in contact with each other are equal.

[0006] Preferably, the screw is a hexagon socket head screw.

[0007] Preferably, the screws and the screw holes are symmetrically arranged at equal intervals in the circumferential direction of the transition plate.

[0008] Preferably, a first sealing groove is provided on the inner side of the rod head sealing flange corresponding to the first sealing ring, a second sealing groove is provided on the side of the rod head sealing flange facing the transition plate corresponding to the second sealing ring, a third sealing groove is provided on the side of the transition plate facing the planar groove, the first sealing ring is installed in the first sealing groove, the second sealing ring is installed in the second sealing groove, and the third sealing ring is installed in the third sealing groove.

[0009] Preferably, the first sealing groove on the rod head sealing flange is arranged near the end facing away from the transition plate, the second sealing groove is arranged near one end of the piston rod, and the third sealing groove is arranged near the outer surface edge of the rod head.

[0010] The utility model at least includes the following beneficial effects: the utility model has an extra-large pile-driving ship oil cylinder rod head threaded sealing structure, adopts an axially vertical threaded connection form for the piston rod and the rod head, and a transition plate is arranged in the gap at the connection, and a combined sealing form of the rod head sealing flange is vertically connected by screws, so as to achieve a good seal of the connecting mating surface between the rod head and the piston rod without welding, and at the same time avoids processing O-ring sealing grooves on the extra-large rod head and the piston rod of the extra-large pile-driving ship oil cylinder, thereby reducing the manufacturing cost; the transition plate and the rod head sealing flange can be removed and replaced at any time, and the maintenance is convenient, and compared with the sealing method of directly processing the sealing groove on the rod head and the piston rod, the maintenance cost is reduced.

[0011] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a front view of the structure of the utility model arranged between the piston rod and the rod head;

[0013] Figure 2 It is a cross-sectional structural diagram of the utility model without installing the transition plate and the rod head sealing flange;

[0014] Figure 3 This is a cross-sectional structural diagram of the gap-arranged transition plate and the rod head sealing flange of the utility model.

[0015] Explanation of the markings in the specification: 1. piston rod; 2. rod head; 3. plane groove; 4. gap; 5. transition plate; 6. rod head sealing flange; 7. screw; 8. first sealing ring; 9. second sealing ring; 10. third sealing ring; 11. first sealing groove; 12. second sealing groove; 13. second sealing groove. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0017] In the description of the present invention, terms such as "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0018] like Figure 1 , Figure 2 , Figure 3 As shown, the utility model is a threaded sealing structure of the rod head of the oil cylinder of an extra-large pile-driving ship, the piston rod 1 and the rod head 2 are axially perpendicular and threadedly connected, at the threaded connection, a plane groove 3 is processed on the side of the rod head 2 facing the piston rod 1, the plane groove 3 is matched with the end face of the piston rod 1 and is spaced to form a gap 4, a transition plate 5 is transitionally connected in the gap 4, the transition plate 5 is an annular plate structure and is sleeved at the corresponding position of the end of the piston rod 1, the outer diameter of the transition plate 5 is larger than the outer diameter of the end of the piston rod 1 and a connecting portion is formed at the exceeding part, a screw hole is opened on the side of the connecting portion facing the piston rod 1, a rod head sealing flange 6 is fitted and sleeved on the end of the piston rod 1 at the side of the connecting portion facing away from the rod head 2, the rod head sealing flange 6 and the connecting portion are fixedly connected by screws 7, a first sealing ring 8 is arranged between the rod head sealing flange 6 and the end of the piston rod 1, a second sealing ring 9 is arranged between the rod head sealing flange 6 and the connecting portion, and a third sealing ring 10 is arranged between the transition plate 5 and the plane groove 3, so as to form sealed connections respectively.

[0019] For illustration, Figure 1The left side is the side where the piston rod 1 is located, the right side is the side where the rod head 2 is located, and the inner side is the side of the annular structure close to the center of the circle. The rod head 2 and the piston rod 1 are axially vertically connected and adopt a threaded connection form. Due to the axial vertical connection, the cylindrical surface of the rod head 2 is tangent to the end face of the piston rod 1. After the plane groove 3 is processed at the rod head 2 and then the thread is processed, the plane of the groove of the rod head 2 can be matched with the end face of the piston rod 1. The gap 4 generated at the connection between the matching surfaces is added with a transition plate 5 to play a sealing transition role. The left and right sides of the transition plate 5 are respectively pressed by the end face of the piston rod 1 and the plane groove 3. The first sealing ring 8, the second sealing ring 9, and the third sealing ring 10 are respectively O-rings (O-type rubber sealing rings). By setting the transition plate 5, the sealing contact area of ​​the O-ring can be increased, the sealing area can be increased, and then the sealing of the rod head 2 side is achieved by the third sealing ring 10. The rod head sealing flange 6 on the left side of the transition plate 5 is fixed to the transition plate 5 by screws 7, which can not only fix the transition plate 5 but also increase the stability of the transition plate 5. The first sealing ring 8 and the second sealing ring 9 are respectively arranged on the two contact end faces inside the rod head sealing flange 6, which can also realize the axial sealing of the piston rod 1 and the right side sealing in contact with the transition plate 5, thereby realizing an all-round good sealing effect at the connection between the entire rod head 2 and the piston rod 1. If there is no transition plate 5, it is necessary to process sealing grooves on both the piston rod 1 and the rod head 2. For such an oversized piston rod 1 and the rod head 2, the processing difficulty is very large. In addition, when the transition plate 5 is not set, there is only one bonding surface between the rod head 2 and the piston rod 1. After adding the transition plate 5 and the rod head sealing flange 6, three bonding surfaces are generated, which enhances the structural sealing effect after the threaded connection between the rod head 2 and the piston rod 1.

[0020] The threaded sealing structure of the rod head 2 of the oil cylinder of the extra-large pile-driving ship of the utility model adopts an axially vertical threaded connection form for the piston rod 1 and the rod head 2, a transition plate 5 is arranged in the gap 4 at the connection, and a combined sealing form of a rod head sealing flange 6 is vertically connected by screws 7, so that a good seal of the connecting mating surface between the rod head 2 and the piston rod 1 is achieved without welding, and at the same time, it is avoided to process an O-ring sealing groove on the super-large rod head 2 and the piston rod 1 of the oil cylinder of the extra-large pile-driving ship, thereby reducing the manufacturing cost, and the transition plate 5 and the rod head sealing flange 6 can be removed and replaced at any time, and maintenance is convenient. Compared with the sealing method of directly processing the sealing groove on the rod head 2 and the piston rod 1, the maintenance cost is reduced.

[0021] In another technical solution, Figure 3 As shown, the outer diameter of the rod head sealing flange 6 gradually increases along the axial direction from the piston rod 1 to the rod head 2, and the outer diameters of the rod head sealing flange 6 and the transition plate 5 that are in contact with each other are equal, so that the connecting parts of the rod head sealing flange 6 and the transition plate 5 are aligned and in uniform contact, which is convenient for installation operation, and the screw holes are aligned with the screws 7 to fix them into one.

[0022] In another technical solution, Figure 3As shown, the screw 7 is a hexagon socket head screw 7, which is easy to install and disassemble, and can withstand a large load when used on the oil cylinder of a super-large pile-driving ship.

[0023] In another technical solution, Figure 3 As shown, the screws 7 and the screw holes are symmetrically arranged at equal intervals in the circumferential direction of the transition plate 5 to improve the connection and fastening effect between the transition plate 5 and the rod head sealing flange 6 and maintain the connection force balance.

[0024] In another technical solution, Figure 3 As shown, the inner side of the rod head sealing flange 6 is provided with a first sealing groove 11 corresponding to the first sealing ring 8, the side of the rod head sealing flange 6 facing the transition plate 5 is provided with a second sealing groove 12 corresponding to the second sealing ring 9, the side of the transition plate 5 facing the plane groove 3 is provided with a third sealing groove 13, the first sealing ring 8 is installed in the first sealing groove 11, the second sealing ring 9 is installed in the second sealing groove 12, and the third sealing ring 10 is installed in the third sealing groove 13. The corresponding sealing grooves are provided on the transition plate 5 and the rod head sealing flange 6, the production and processing cost is lower, and the installation of the sealing ring is more convenient, which is equivalent to having sealing effects in three directions respectively and setting directions to restrain each other, thereby enhancing the sealing effect of the joint surface.

[0025] In another technical solution, Figure 3 As shown, the first sealing groove 11 on the rod head sealing flange 6 is arranged near the end facing away from the transition plate 5, the second sealing groove 12 is arranged near the end of the piston rod 1, and the third sealing groove 13 is arranged near the outer surface edge of the rod head 2. While strengthening the sealing effect, it is beneficial to maintain the connection and fastening between the transition plate 5 and the rod head sealing flange 6, and the close fitting effect between the piston rod 1 and the rod head 2.

[0026] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the drawings shown and described herein.

Claims

1. A thread sealing structure for the oil cylinder rod head of an extra-large pile-driving ship, characterized in that: The piston rod and the rod head are axially perpendicular and threadedly connected. At the threaded connection, a flat groove is processed on one side of the rod head facing the piston rod. The flat groove is matched with the end face of the piston rod and is spaced to form a gap. A transition plate is provided in the gap for transition connection. The transition plate is an annular plate structure and is sleeved on the corresponding position of the end of the piston rod. The outer diameter of the transition plate is larger than the outer diameter of the end of the piston rod and a connecting portion is formed in the exceeding part. A screw hole is provided on the side of the connecting portion facing the piston rod. A rod head sealing flange is fitted on the end of the piston rod on the side of the connecting portion facing away from the rod head. The rod head sealing flange and the connecting portion are fixedly connected by screws. A first sealing ring is provided between the rod head sealing flange and the end of the piston rod, a second sealing ring is provided between the rod head sealing flange and the connecting portion, and a third sealing ring is provided between the transition plate and the flat groove to form sealed connections respectively.

2. The thread seal structure for the cylinder rod head of a super-large pile-driving ship according to claim 1, characterized in that: The outer diameter of the rod head sealing flange gradually increases along the axial direction from the piston rod to the rod head, and the outer diameters of the rod head sealing flange and the transition plate on the side that fits with each other are equal.

3. The thread seal structure of the cylinder rod head of a super-large pile-driving ship according to claim 1, characterized in that: The screw is a hexagon socket head screw.

4. The thread sealing structure for the cylinder rod head of a super-large pile-driving ship according to claim 1, characterized in that: The screws and the screw holes are symmetrically arranged at equal intervals in the circumferential direction of the transition plate.

5. The thread sealing structure for the cylinder rod head of a super-large pile-driving ship according to claim 1, characterized in that: A first sealing groove is formed on the inner side of the rod head sealing flange corresponding to the first sealing ring, a second sealing groove is formed on the side of the rod head sealing flange facing the transition plate corresponding to the second sealing ring, a third sealing groove is formed on the side of the transition plate facing the planar groove, the first sealing ring is installed in the first sealing groove, the second sealing ring is installed in the second sealing groove, and the third sealing ring is installed in the third sealing groove.

6. The thread seal structure for the cylinder rod head of a super-large pile-driving ship according to claim 5, characterized in that: The first sealing groove on the rod head sealing flange is arranged near the end facing away from the transition plate, the second sealing groove is arranged near one end of the piston rod, and the third sealing groove is arranged near the outer surface edge of the rod head.

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