Replacing and jacking device for slewing bearing of offshore crane

Abstract

The utility model relates to the technical field of slewing bearings of offshore cranes, in particular to a replacing and jacking device for a slewing bearing of an offshore crane, which comprises a mounting frame, a hydraulic cylinder fixedly connected to the inner bottom wall of the mounting frame, and a slewing flange fixedly connected to the top end of the hydraulic cylinder; the limiting mechanism is arranged on the inner wall of the mounting frame; wherein the limiting mechanism comprises two limiting rods which are fixedly connected to the bottom of the rotary flange; according to the device, through a limiting rod, a hydraulic cylinder and a first ball, a rotary flange is limited in the lifting process, it is guaranteed that the rotary flange cannot deviate in the lifting process, the convenience of a jacking device for replacing a rotary bearing is improved, through a movable frame, a movable block and a sliding block, one-way limiting of upward movement of the limiting rod is achieved, and the lifting efficiency is improved. The sliding of the rotary flange caused by the failure of the hydraulic cylinder is prevented, and the safety of replacing the rotary support by the jacking device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of slewing bearings of offshore cranes, in particular to a jacking device for replacing slewing bearings of offshore cranes. Background Art

[0002] The slewing bearing of an offshore crane is a key connection between the rotating and fixed parts of the crane. It is responsible for withstanding the huge radial force, axial force and overturning moment generated when the crane is working. Due to the harsh working environment at sea, the slewing bearing needs to be regularly inspected and maintained, and sometimes even replaced. Replacing the slewing bearing of an offshore crane is a complex and technically demanding process, especially considering the large size and weight of the crane, and a jacking device is usually required to complete this task.

[0003] After searching, the Chinese patent "A jacking device for replacing the slewing bearing of an offshore crane" authorization announcement number "CN210620067 U" realizes the limiting of the slewing flange during jacking through vertical slides, adjusting bolts, threaded jacks, round nuts and jacking cylinders, thereby ensuring the stability of the slewing bearing replacement.

[0004] When the slewing flange is lifted for a certain distance, the adjusting bolt needs to be turned to limit the position, and the adjusting bolt needs to be turned several times. This method makes it inconvenient to replace the slewing bearing of the jacking device.

[0005] Therefore, a jacking device for replacing the slewing bearing of an offshore crane is proposed to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a jacking device for replacing the slewing bearing of an offshore crane in order to solve the above-mentioned problem, thereby improving the problem that it is inconvenient to replace the slewing bearing of the jacking device.

[0007] The utility model achieves the above-mentioned purpose through the following technical scheme: a jacking device for replacing a slewing bearing of an offshore crane, comprising: a mounting frame, an inner bottom wall of the mounting frame is fixedly connected to a hydraulic cylinder, and the top end of the hydraulic cylinder is fixedly connected to a slewing flange; a limiting mechanism, the limiting mechanism is arranged on the inner wall of the mounting frame; wherein the limiting mechanism comprises two limiting rods fixedly connected to the bottom of the slewing flange, two sliding blocks are fixedly connected to the lower end of the surface of the limiting rod, two movable frames are arranged inside the mounting frame, and movable blocks distributed in equal rows are fixedly connected to the opposite ends of the two movable frames, and a plurality of first balls are rollingly connected to the inner top wall of the mounting frame, wherein the surface of the first ball on one side is rollingly connected to the surface of the hydraulic cylinder, and the surface of the first ball on the other side is rollingly connected to the surface of the limiting rod. Through the limit rod, hydraulic cylinder and the first ball, the slewing flange is limited during lifting, ensuring that the slewing flange will not deviate during lifting, which improves the convenience of replacing the slewing bearing of the jacking device. Through the movable frame, movable block and slider, the one-way limit of the upward movement of the limit rod is achieved to prevent the slewing flange from sliding down due to failure of the hydraulic cylinder, thereby improving the safety of the rotating part of the jacking crane of the jacking device.

[0008] Preferably, the lower end of the interior of the installation frame is rotatably connected to a bidirectional screw, the inner wall of the movable frame is threadedly connected to the surface of the bidirectional screw, the surface of the movable frame is fixedly connected to a plurality of springs, and the other end of the spring is fixedly connected to the interior of the installation frame. Through the bidirectional screw and the spring, the stability of the one-way limit of the upward movement of the slider by the two groups of movable blocks is achieved, ensuring the safety of the slewing flange in the rotating part of the jacking crane.

[0009] Preferably, a plurality of corrugated soft sleeves are fixedly connected to the bottom of the swivel flange, and the bottom ends of the corrugated soft sleeves are fixedly connected to the top of the installation frame.

[0010] Preferably, both sides of the installation frame are provided with blocking plates. The corrugated soft sleeve and the blocking plates are used to block the sides and top of the installation frame, thereby preventing impurities from adhering to the surfaces of the balls, sliders, movable blocks and bidirectional screws, and reducing friction during the lifting of the rotary flange.

[0011] Preferably, one side of the blocking plate is threadedly connected with four bolts, the four bolts are arranged in a rectangular shape, and the surface of the bolts is threadedly connected to one side of the mounting frame. The blocking plate and the mounting frame can be installed or disassembled through the bolts, which is convenient for later maintenance of the hydraulic cylinder in the mounting frame.

[0012] Preferably, the inner bottom of the mounting frame is fixedly connected with a plurality of retaining rings, and the surface of the bidirectional screw rod penetrates and extends out of the inner side of the retaining rings. The retaining rings are used to limit the moving position of the movable frame, ensuring that the surface of the movable block can contact the surface of the slider.

[0013] Preferably, a second ball is rollingly connected to the bottom of the movable frame, and a surface of the second ball is rollingly connected to the inner bottom of the mounting frame.

[0014] Preferably, a slide bar is fixedly connected to the lower end of the mounting frame, and the inner wall of the movable frame is slidably connected to the surface of the slide bar. The slide bar is used to limit the movement of the movable frame and avoid deviation caused by the rotation of the two-way screw rod.

[0015] The beneficial effects of the utility model are:

[0016] 1. The limit rod, hydraulic cylinder and first ball are used to limit the slewing flange during lifting, ensuring that the slewing flange will not deviate during lifting, which improves the convenience of replacing the slewing bearing of the jacking device. The movable frame, movable block and slider are used to limit the upward movement of the limit rod in one direction, preventing the slewing flange from sliding down due to failure of the hydraulic cylinder, thereby improving the safety of the rotating part of the jacking device and the jacking crane;

[0017] 2. Through the bidirectional screw and spring, the two sets of movable blocks can stabilize the upward movement of the slider in one direction, ensuring the safety of the slewing flange in the rotating part of the jacking crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a cross-sectional view of the installation frame of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the limiting mechanism of the utility model;

[0021] Figure 4 for Figure 3 A is an enlarged view of the middle image.

[0022] In the figure: 1. mounting frame; 2. hydraulic cylinder; 3. slewing flange; 4. limiting mechanism; 41. limiting rod; 42. movable frame; 43. movable block; 44. sliding block; 45. bidirectional screw rod; 46. first ball; 47. spring; 48. retaining ring; 49. corrugated soft sleeve; 410. sealing plate; 411. second ball; 412. sliding rod. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] When implementing: Figure 1-4 As shown, a jacking device for replacing the slewing bearing of an offshore crane comprises: a mounting frame 1, the inner bottom wall of the mounting frame 1 is fixedly connected with a hydraulic cylinder 2, the top of the hydraulic cylinder 2 is fixedly connected with a slewing flange 3; a limiting mechanism 4, the limiting mechanism 4 is arranged on the inner wall of the mounting frame 1; wherein the limiting mechanism 4 comprises two limiting rods 41 fixedly connected to the bottom of the slewing flange 3, the lower end of the surface of the limiting rod 41 is fixedly connected with two sliding blocks 44, the interior of the mounting frame 1 is provided with two movable frames 42, the opposite ends of the two movable frames 42 are fixedly connected with movable blocks 43 distributed in equal rows, and the inner top wall of the mounting frame 1 is rollingly connected with a plurality of first balls 46, wherein the surface of the first balls 46 on one side is rollingly connected to the surface of the hydraulic cylinder 2, and the surface of the first balls 46 on the other side is rollingly connected to the surface of the limiting rod 41.

[0025] When the slewing bearing of the offshore crane needs to be replaced, all power supplies of the offshore crane are turned off to ensure safe operation. Multiple installation frames 1 are sequentially installed at corresponding positions below the rotating part of the crane by bolts, and the contact surface of the slewing flange 3 and the rotating part of the crane is fixed by bolts. The total power supply of multiple hydraulic cylinders 2 is manually turned on, and the top of the hydraulic cylinder 2 moves up on the surface of the first ball 46 on one side to drive the slewing flange 3 to move up. The upward movement of the slewing flange 3 drives the limit rod 41 to move up, so that the limit rod 41 moves up on the surface of the first ball 46 on the other side, so that the slewing flange 3 moves stably to lift the rotating part of the crane from the slewing bearing. Until the rotating part is completely separated from the slewing bearing, the slewing bearing installation plane has been disengaged, use a special tool to pull it out and replace it, place the new slewing bearing on the installation surface of the fixed part, use a positioning tool to ensure that it is correctly aligned and installed, then the top of the hydraulic cylinder 2 moves down to drive the crane rotating part to slowly descend until the new slewing bearing contacts the rotating part, use bolts and other fasteners to fix the new slewing bearing between the rotating part and the fixed part, and the offshore crane slewing bearing can be replaced. At this time, close the hydraulic cylinder 2 and remove the mounting frame 1 at the corresponding position on the crane and store it for use next time it is replaced.

[0026] like Figure 4As shown, the inner lower end of the mounting frame 1 is rotatably connected with a bidirectional screw rod 45, the inner wall of the movable frame 42 is threadedly connected to the surface of the bidirectional screw rod 45, the surface of the movable frame 42 is fixedly connected with a plurality of spring plates 47, the other end of the spring plates 47 is fixedly connected to the inside of the mounting frame 1, the inner bottom of the mounting frame 1 is fixedly connected with a plurality of retaining rings 48, the surface of the bidirectional screw rod 45 penetrates and extends out of the inner side of the retaining ring 48, the bottom of the movable frame 42 is rollingly connected with a second ball 411, the surface of the second ball 411 is rollingly connected to the inner bottom of the mounting frame 1, the inner lower end of the mounting frame 1 is fixedly connected with a slide rod 412, and the inner wall of the movable frame 42 is slidably connected to the surface of the slide rod 412.

[0027] When the jacking device is needed, the bidirectional screw rod 45 is rotated, and the bidirectional screw rod 45 rotates to drive the two movable frames 42 to approach each other. When the movable frame 42 moves and hits one end of one of the retaining rings 48, the rotation of the bidirectional screw rod 45 is stopped, and the movable frame 42 moves to drive multiple movable blocks 43 to move, so that the slider 44 contacts the movable block 43 and moves up. Because the slider 44 and the movable block 43 are both in the shape of a right-angled triangle as a whole, the limit rod 41 moves up to drive the slider 44 to move up, so that the inclined surface of the slider 44 moves on the inclined surface of the movable block 43. When the hydraulic cylinder 2 fails, the slewing flange 3 moves downward to drive the limit rod 41 and the slider 44 downward. Because the straight surface of the slider 44 hits the straight surface of the movable block 43, the slider 44, the slewing flange 3 and the rotating part are prevented from moving downward suddenly, making it safer for the slewing flange 3 to drive the rotating part to move upward.

[0028] like Figure 2 As shown, a plurality of corrugated soft sleeves 49 are fixedly connected to the bottom of the swivel flange 3, and the bottom end of the corrugated soft sleeve 49 is fixedly connected to the top of the mounting frame 1. Sealing plates 410 are provided on both sides of the mounting frame 1, and one side of the sealing plate 410 is threadedly connected with four bolts, and the four bolts are distributed in a rectangular shape, and the surface of the bolts is threadedly connected to one side of the mounting frame 1.

[0029] When the utility model is in use, all power supplies of the offshore crane are turned off to ensure safe operation, multiple installation frames 1 are sequentially installed at corresponding positions below the rotating part of the crane by bolts, and the contact surface of the slewing flange 3 and the rotating part of the crane is fixed by bolts, and the total power supply of multiple hydraulic cylinders 2 is manually turned on, and the top of the hydraulic cylinder 2 moves up on the surface of the first ball 46 on one side to drive the slewing flange 3 to move up, and the upward movement of the slewing flange 3 drives the limit rod 41 and the slider 44 to move up, so that the limit rod 41 moves up on the surface of the first ball 46 on the other side, and the slider 44 moves up on the surface of the movable block 43, so that the slewing flange 3 moves stably to lift the rotating part of the crane from the slewing support until the rotating part is completely separated from the slewing support. The mounting plane of the slewing bearing has been disengaged. Use special tools to pull it out and replace it. Place the new slewing bearing on the mounting surface of the fixed part. Use positioning tools to ensure that it is correctly aligned and installed. At this time, turn the bidirectional screw rod 45. The bidirectional screw rod 45 moves to drive the two movable frames 42 away from each other, so that the movable block 43 is away from the slider 44. The top of the hydraulic cylinder 2 moves downward to drive the rotating part of the crane to slowly descend until the new slewing bearing contacts the rotating part. Use bolts and other fasteners to fix the new slewing bearing between the rotating part and the fixed part. The slewing bearing of the offshore crane can be replaced. At this time, turn off the hydraulic cylinder 2 and remove the mounting frame 1 at the corresponding position on the crane and store it for use next time it is replaced.

[0030] It should be noted that the mounting frame 1, hydraulic cylinder 2, slewing flange 3, bidirectional screw 45, first ball 46 and corrugated soft sleeve 49 in the above description are all relatively mature devices in the existing technology. The specific models can be selected according to actual needs. At the same time, the hydraulic cylinder 2 can be powered by a built-in power supply or by AC power. The specific power supply method is selected according to the situation and will not be elaborated here.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A jacking device for replacing the slewing bearing of an offshore crane, characterized in that: include: An installation frame (1), wherein the inner bottom wall of the installation frame (1) is fixedly connected to a hydraulic cylinder (2), and the top end of the hydraulic cylinder (2) is fixedly connected to a swivel flange (3); A limiting mechanism (4), wherein the limiting mechanism (4) is arranged on an inner wall of the installation frame (1); The limiting mechanism (4) comprises two limiting rods (41) fixedly connected to the bottom of the slewing flange (3); two sliders (44) are fixedly connected to the lower end of the surface of the limiting rod (41); two movable frames (42) are arranged inside the installation frame (1); the opposite ends of the two movable frames (42) are fixedly connected to movable blocks (43) distributed in equal rows; the inner top wall of the installation frame (1) is rollingly connected to a plurality of first balls (46); the surface of the first balls (46) on one side is rollingly connected to the surface of the hydraulic cylinder (2); and the surface of the first balls (46) on the other side is rollingly connected to the surface of the limiting rod (41).

2. The jacking device for replacing the slewing bearing of an offshore crane according to claim 1, characterized in that: The lower end of the interior of the installation frame (1) is rotatably connected to a bidirectional screw rod (45); the inner wall of the movable frame (42) is threadedly connected to the surface of the bidirectional screw rod (45); a plurality of spring plates (47) are fixedly connected to the surface of the movable frame (42); and the other end of the spring plate (47) is fixedly connected to the interior of the installation frame (1).

3. The jacking device for replacing the slewing bearing of an offshore crane according to claim 1, characterized in that: A plurality of corrugated soft sleeves (49) are fixedly connected to the bottom of the swivel flange (3), and the bottom ends of the corrugated soft sleeves (49) are fixedly connected to the top of the installation frame (1).

4. The jacking device for replacing the slewing bearing of an offshore crane according to claim 1, characterized in that: Sealing plates (410) are provided on both sides of the installation frame (1).

5. The jacking device for replacing the slewing bearing of an offshore crane according to claim 4, characterized in that: One side of the blocking plate (410) is threadedly connected to four bolts, the four bolts are distributed in a rectangular shape, and the surfaces of the bolts are threadedly connected to one side of the installation frame (1).

6. The jacking device for replacing the slewing bearing of an offshore crane according to claim 2, characterized in that: A plurality of retaining rings (48) are fixedly connected to the inner bottom of the installation frame (1), and the surface of the bidirectional screw rod (45) penetrates and extends out of the inner side of the retaining ring (48).

7. The jacking device for replacing the slewing bearing of an offshore crane according to claim 1, characterized in that: The bottom of the movable frame (42) is rollingly connected to a second ball (411), and the surface of the second ball (411) is rollingly connected to the inner bottom of the installation frame (1).

8. The jacking device for replacing the slewing bearing of an offshore crane according to claim 1, characterized in that: A sliding rod (412) is fixedly connected to the inner lower end of the installation frame (1), and the inner wall of the movable frame (42) is slidably connected to the surface of the sliding rod (412).

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