Marine diesel engine cylinder liner vertical lifting sling

Abstract

The application discloses a vertical lifting sling for a marine diesel engine cylinder liner, which comprises a hoop combination, a hoop combination opening and closing locking mechanism, a lifting beam and a pair of lifting arms, wherein the hoop combination comprises a fixed hoop and a movable hoop, one end of the fixed hoop is hinged to one end of the movable hoop, and the other end of the fixed hoop is connected to the other end of the movable hoop through the hoop combination opening and closing locking mechanism. Before the cylinder liner is vertically lifted, the fixed hoop and the movable hoop are closed and locked to enclose the cylinder liner, at this time, the upper side of the whole cylindrical surface formed by the inner arc surface of the fixed hoop and the inner arc surface of the movable hoop abuts against the connecting position of the transition convex arc surface and the outer cylindrical surface in the middle section of the cylinder liner, the lower ends of the lifting arms are symmetrically and vertically welded to the outer cylindrical surface of the fixed hoop, and the two ends of the lifting beam are respectively welded to the upper ends of the corresponding lifting arms. The application has the advantages of compact structure, convenient and fast use and low manufacturing cost. When the cylinder liner is lifted, no overturning moment is generated, and the lifting safety is ensured.

Description

Technical Field

[0001] This invention relates to a special lifting tool, particularly a special lifting tool for vertically lifting cylinder liners of marine diesel engines, belonging to the field of lifting tool technology. Background Technology

[0002] Cylinder liners are one of the key components of marine diesel engines, and their quality directly affects the overall performance and service life of the engine. A cylinder liner is a thin-walled cylinder with a wall thickness to outer diameter (D) ratio of less than 1:20. The machining of cylinder liners requires high precision and involves complex processes. Especially during transfer between critical processes such as honing the inner bore and surface treatment, vertical lifting operations are necessary to avoid damage to the important formed surfaces of the cylinder liner or deformation and out-of-roundness caused by other lifting methods. Lifting cylinder liners requires perpendicularity to the horizontal plane. When the center of gravity of the cylinder liner is located in the middle of the lifting plumb line, no overturning moment will be generated, allowing for safe and reliable stable lifting. Traditional vertical lifting methods for thin-walled cylinders vary, and while they can meet some requirements, most have certain drawbacks. Specifically, the lifting plumb line is difficult to pass through the center of gravity of the cylinder liner, easily generating an overturning moment and posing a safety hazard. Summary of the Invention

[0003] The purpose of this invention is to provide a vertical lifting device for marine diesel engine cylinder liners, which can quickly and accurately lock at the connection between the transition arc surface and the cooling outer arc surface in the middle section of the cylinder liner to ensure safe vertical lifting of the cylinder liner.

[0004] This invention is achieved through the following technical solution:

[0005] A vertical lifting device for marine diesel engine cylinder liners includes a clamp assembly, a clamp assembly opening and closing locking mechanism, a lifting beam, and a pair of booms. The clamp assembly includes a fixed clamp and a movable clamp. The inner arc of the fixed clamp and the inner arc of the movable clamp are concentric, and the arc angle α of the inner arc of the fixed clamp is greater than the arc angle β of the inner arc of the movable clamp. One end of the fixed clamp and one end of the movable clamp are hinged by a first hinge pin, and the other end of the fixed clamp and the other end of the movable clamp are locked together by the clamp assembly opening and closing locking mechanism. Before vertically lifting the cylinder liner, the fixed clamp and the movable clamp are closed and locked to enclose the cylinder liner. At this time, the upper side of the cylindrical surface formed by the inner arc surface of the fixed clamp and the inner arc surface of the movable clamp abuts against the connection between the transition convex arc surface and the outer cylindrical surface in the middle section of the cylinder liner. The diameter D of the cylindrical surface matches the outer diameter D1 of the outer cylindrical surface of the cylinder liner. The lower end of the boom is symmetrically and vertically welded and fixed to both sides of the outer cylindrical surface of the fixed clamp. The lifting beam has a lifting hole in the center, and the two ends of the lifting beam are welded to the corresponding upper ends of the boom.

[0006] The objectives of this invention can also be further achieved through the following technical measures.

[0007] Furthermore, the clamp combination opening and closing locking mechanism includes a hook, a compression spring, and a compression spring core. One end of the hook extends laterally towards the fixed clamp, and the middle of the hook is hinged to the other end of the movable clamp via a second hinge pin. One end of the compression spring is embedded in the compression spring countersunk hole at the other end of the movable clamp. One end of the compression spring core presses against the end of the compression spring and is screwed into the bottom screw hole of the compression spring countersunk hole. The other end of the compression spring abuts against the hook countersunk hole at the other end of the hook. When the fixed clamp and the movable clamp are closed and locked, the hook is embedded in the groove at the other end of the fixed clamp.

[0008] Furthermore, a flange extends radially from one end of the compression spring core, and a screw extends axially from the center of the flange near the bottom of the compression spring countersunk hole. The screw is screwed into the bottom screw hole of the compression spring countersunk hole, so that the flange presses against the bottom ring of the compression spring.

[0009] Furthermore, the grooves at the other end of the hook and the fixing clamp are both right-angled triangles, and the hook and the grooves match each other.

[0010] Furthermore, when the fixed clamp and the movable clamp are closed and locked, the difference between the diameter D of the inner cylindrical surface of the hole and the outer diameter D1 of the outer cylindrical surface of the cylinder liner is: D - D1 = 1.5~2.5mm.

[0011] This invention features a compact structure, convenient and quick use, and low manufacturing cost. It employs a structure where a fixed clamp and a movable clamp are hinged at one end and locked at the other end by a clamp combination opening and closing locking mechanism. This ensures that the locked fixed and movable clamps are positioned at the junction of the transition convex arc surface and the outer cylindrical surface in the middle section of the cylinder liner, and that the center of gravity of the cylinder liner is located within the lifting line of this invention. During lifting, the cylinder liner will not generate an overturning moment, ensuring safe lifting.

[0012] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a top view of the present invention;

[0014] Figure 2 yes Figure 1 AA section view;

[0015] Figure 3 yes Figure 1 Enlarged view of Part I. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and an embodiment of a vertical lifting device for marine medium-speed diesel engine cylinder liners with a rotation speed of 600-1000 r / min.

[0017] In the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" that indicate orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and do not indicate or imply that the device referred to must have a specific orientation.

[0018] like Figure 1 and Figure 2 As shown, this embodiment includes a clamp assembly 1, a clamp assembly opening and closing locking mechanism 2, a lifting beam 3, and a pair of booms 4. The clamp assembly 1 includes a fixed clamp 11 and a movable clamp 12. The inner arc of the fixed clamp 11 and the inner arc of the movable clamp 12 are concentric, and the arc angle α of the inner arc of the fixed clamp 11 is greater than the arc angle β of the inner arc of the movable clamp 12. Figure 1 The left end of the fixed clamp 11 and the left end of the movable clamp 12 are hinged by the first hinge pin 13, allowing the movable clamp 12 to be opened by rotating clockwise around the first hinge pin 13 and closed by rotating counterclockwise, which is very convenient to use. The right end of the fixed clamp 11 and the right end of the movable clamp 12 are locked together by the clamp combination opening and closing locking mechanism 2. Before the cylinder liner 10 is lifted vertically, the fixed clamp 11 and the movable clamp 12 are closed and locked to surround the cylinder liner 10. At this time, the upper side of the cylindrical surface 110 formed by the inner arc surface of the fixed clamp 11 and the inner arc surface of the movable clamp 12 abuts against the connection between the middle transition convex arc surface 101 and the outer cylindrical surface 102 of the cylinder liner 10. The diameter D of the cylindrical surface matches the outer diameter D1 of the outer cylindrical surface of the cylinder liner. The lower end of the boom 4 is symmetrically and vertically welded and fixed on both sides of the outer cylindrical surface of the fixing clamp 11. The lifting beam 3 has a lifting hole 31 in the center, and the two ends of the lifting beam 3 are respectively welded to the upper end of the corresponding boom 4.

[0019] like Figure 3 As shown, the clamp combination opening and closing locking mechanism 2 includes a hook 21, a compression spring 22, and a compression spring core 23. One end of the hook 21 extends laterally into a hook head 211 towards the fixed clamp 11. The middle part of the hook 21 is hinged to the right end of the movable clamp 12 via a second hinge pin 24. The left end of the compression spring 22 is embedded in the countersunk hole 121 at the right end of the movable clamp 12, and the right end of the compression spring 22 abuts against the hook countersunk hole 211 at the other end of the hook 21.

[0020] A flange 231 extends radially from the right end of the compression spring core 23. A screw 232 extends axially from the center of the flange 231 near the bottom of the compression spring countersunk hole 121. The screw 232 is screwed into the screw hole 122 at the bottom of the compression spring countersunk hole 121, so that the flange 231 presses against the compression spring bottom ring 221, fixing the left end of the compression spring 22 in the compression spring countersunk hole 121 to prevent the compression spring 22 from falling off.

[0021] Both the hook 211 and the groove 111 at the other end of the fixed clamp 11 are right-angled triangles, and the hook 211 and the groove 111 match each other. When the fixed clamp 11 and the movable clamp 12 are closed and locked, under the return elastic force of the compression spring 22, the hook 211 is firmly embedded in the groove 111 at the right end of the fixed clamp 11, so that it will not loosen during the vertical lifting of the cylinder liner 10, ensuring the safety of the vertical lifting of the cylinder liner 10. When it is necessary to open the movable clamp 12, simply press... Figure 3 The lower end of the middle hook 21 compresses the compression spring 22, and the hook head 211 at the upper end of the hook 21 disengages from the slot 111, thereby unlocking the movable clamp 12. This allows the movable clamp 12 to be opened and the invention to be removed, making it very convenient to use.

[0022] When the fixed clamp 11 and the movable clamp 12 are closed and locked, the difference between the diameter D of the inner cylindrical surface 110 and the outer diameter D1 of the outer cylindrical surface 102 of the cylinder liner 10 is: D - D1 = 1.5~2.5mm. This facilitates the clamping of the cylinder liner 10 after the fixed clamp 11 and the movable clamp 12 are closed. The sling at the lower end of the crane is connected to the crane via a lifting shackle. Figure 3 After the lifting hole 31 at the center of the middle lifting beam 3 is connected, it can be pressed... Figure 2 The cylinder liner 10 is lifted vertically in the direction indicated by the arrow, at which point the center of gravity G of the cylinder liner is located in the lifting vertical line.

[0023] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A vertical lifting device for marine diesel engine cylinder liners, characterized in that, The system includes a clamp assembly, a clamp assembly opening and closing locking mechanism, a lifting beam, and a pair of booms. The clamp assembly includes a fixed clamp and a movable clamp. The inner arcs of the fixed clamp and the movable clamp are concentric, and the arc angle α of the inner arc of the fixed clamp is greater than the arc angle β of the inner arc of the movable clamp. One end of the fixed clamp and one end of the movable clamp are hinged together by a first hinge pin, and the other end of the fixed clamp and the other end of the movable clamp are locked together by the clamp assembly opening and closing locking mechanism. Before the cylinder liner is vertically lifted... First, close and lock the fixed clamp and the movable clamp to surround the cylinder liner. At this time, the upper side of the whole cylindrical surface formed by the inner arc surface of the fixed clamp and the inner arc surface of the movable clamp abuts against the connection between the transition convex arc surface and the outer cylindrical surface in the middle section of the cylinder liner. The diameter D of the whole cylindrical surface matches the outer diameter D1 of the outer cylindrical surface of the cylinder liner. The lower end of the boom is symmetrically and vertically welded and fixed on both sides of the outer cylindrical surface of the fixed clamp. The center of the lifting beam is provided with a lifting hole, and the two ends of the lifting beam are respectively welded to the upper end of the corresponding boom. The clamp combination opening and closing locking mechanism includes a hook, a compression spring, and a compression spring core. One end of the hook extends laterally towards the fixed clamp, and the middle of the hook is hinged to the other end of the movable clamp via a second hinge pin. One end of the compression spring is embedded in the compression spring countersunk hole at the other end of the movable clamp. One end of the compression spring core presses against the end of the compression spring and is screwed into the bottom screw hole of the compression spring countersunk hole. The other end of the compression spring abuts against the hook countersunk hole at the other end of the hook. When the fixed clamp and the movable clamp are closed and locked, the hook is embedded in the groove at the other end of the fixed clamp.

2. The marine diesel engine cylinder liner vertical lifting device as described in claim 1, characterized in that, A flange extends radially from one end of the compression spring core, and a screw extends axially from the center of the flange near the bottom of the compression spring countersunk hole. The screw is screwed into the bottom screw hole of the compression spring countersunk hole, so that the flange presses against the bottom ring of the compression spring.

3. The marine diesel engine cylinder liner vertical lifting device as described in claim 1, characterized in that, The hook and the groove at the other end of the fixing clamp are both right-angled triangles, and the hook and the groove match each other.

4. The marine diesel engine cylinder liner vertical lifting device as described in claim 1, characterized in that, When the fixed clamp and the movable clamp are closed and locked, the difference between the diameter D of the inner cylindrical surface of the hole and the outer diameter D1 of the outer cylindrical surface of the cylinder liner is: D - D1 = 1.5 ~ 2.5 mm.

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