Marine large connecting rod cover expansion lifting appliance

Abstract

The invention relates to the technical field of marine diesel engine assembly, and provides a marine large connecting rod cover expansion lifting appliance which comprises a frame body, and the frame body is provided with at least one set of inner supporting assemblies used for being inserted into assembly holes in a connecting rod cover and expanding and expanding to achieve connection with the connecting rod cover. The expansion lifting appliance further comprises a holding and clamping assembly used for holding and clamping the front end cover in an embedded mode. When a large connecting rod cover is lifted, the inner supporting assembly is inserted into an assembly hole in the connecting rod cover and expanded to be opened, the lifting appliance and the connecting rod cover are connected by tightly abutting against the hole wall of the assembly hole, meanwhile, the connecting rod cover is clamped in an embedded mode through the clamping assembly, and the connecting stability of the lifting appliance and the connecting rod cover is guaranteed; the lifting operation safety of the large connecting rod cover is guaranteed, the large connecting rod cover can be safely and stably lifted without auxiliary tools, operation is easy, use is convenient, and the assembling efficiency of the marine diesel engine can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of marine diesel engine assembly, in particular to a large marine connecting rod cover expansion hanger. Background Art

[0002] During the assembly process of high-power marine diesel engines, the large connecting rod cover, as one of the core components of the crank-connecting rod mechanism, usually weighs more than 20 kg and needs to be lifted and assembled to the matching position between the connecting rod body and the crankshaft journal by a hoist. Traditional lifting processes mostly use hook-shaped hoists or universal clamps. Due to the special structural design of the connecting rod cover of a marine diesel engine, its surface usually lacks standardized hanging points that can be directly adapted to traditional hoists. Operators need to use temporary fixing devices such as ropes and straps to bundle or wrap the connecting rod cover, and then connect it to the hoist hook for lifting operations. After the large connecting rod cover is lifted to the designated position, the temporary fixing device needs to be removed. The entire lifting process is very troublesome and time-consuming, which seriously affects the assembly efficiency of the marine diesel engine.

[0003] Therefore, the present invention proposes a large-scale connecting rod cover expansion hanger for ships to solve the above problems. Summary of the Invention

[0004] The embodiment of the present invention aims to provide a large-scale connecting rod cover expansion hanger for ships to solve the above-mentioned problems.

[0005] To achieve the above object, the present invention provides the following technical solutions: A large-scale marine connecting rod cover expansion spreader includes a frame body provided with at least one set of internal support components for inserting into assembly holes on the connecting rod cover and expanding to connect with the connecting rod cover. The expansion spreader also includes a clamping component for internally clamping the front end cover. The clamping assembly includes two mounting plates that are arranged in parallel and can move toward or away from each other. Push rods are densely arranged in a lattice pattern on the mounting plates, and the push rods slide through the mounting plates.

[0006] In an optional scheme: the internal support assembly includes a main cylinder body with closed ends and multiple rows of sub-cylinder bodies circumferentially arranged around the central axis of the main cylinder body, the sub-cylinder bodies are connected to the main cylinder body, and one end of the sub-cylinder body away from the main cylinder body is open, and the side of the main cylinder body is provided with a resistance piece corresponding to the multiple rows of sub-cylinder bodies one by one, the sub-cylinder body is provided with a first sealing piston and a first boss and a second boss for limiting the moving range of the first sealing piston, a first connecting rod is provided between the first sealing piston and the corresponding resistance piece, and the expansion hanger also includes a pressure control assembly for controlling the internal air pressure of the main cylinder body to realize the outward expansion / contraction and reset of multiple resistance pieces.

[0007] In an optional solution: a rubber pad is provided on the side of the resistance member that is in contact with the wall of the assembly hole on the front end cover, and adsorption holes are evenly distributed on the rubber pad.

[0008] In an optional solution: the clamping assembly also includes two telescopic parts for respectively driving the two mounting plates to move toward / away from each other, and a piezoelectric sensing plate is provided on the side of the two mounting plates away from each other, and a limiting cap is provided at one end of the push rod close to the piezoelectric sensing plate, and an elastic part is sleeved on the rod section of the push rod between the mounting plate and the limiting cap, and the two ends of the elastic part are respectively connected to the mounting plate and the limiting cap.

[0009] In an optional solution: the pressure control assembly includes an air control cylinder arranged on the frame and two second sealing pistons arranged in the air control cylinder, the air control cylinder is located between two mounting plates, the two second sealing pistons correspond to the two mounting plates respectively, and a second connecting rod is provided between the second sealing pistons and the corresponding mounting plates, a connecting air guide pipe is provided between the air control cylinder and the main cylinder body, and the air control cylinder is also provided with a two-way pressure valve for maintaining the internal air pressure of the air control cylinder within a set range.

[0010] In an optional solution: the internal support assembly is set into two groups, and the distance between the two groups of internal support assemblies is adjustable to adapt to the spacing of the assembly holes set on both sides of the front end cover of different specifications. The expansion sling also includes a distance adjustment assembly for adjusting the distance between the two groups of internal support assemblies.

[0011] In an optional solution: the distance adjustment component includes two slide grooves provided on the frame and two slide seats respectively slidably clamped in the two slide grooves, the two groups of internal support components are respectively provided on the two slide seats, and the frame is also rotatably provided with a bidirectional threaded rod, and the two rod sections of the bidirectional threaded rod with opposite thread directions respectively pass through the two slide seats in a threaded matching manner.

[0012] In an optional solution: a handwheel is provided at one end of the bidirectional threaded rod, and a locking knob for positioning the bidirectional threaded rod is also provided on the frame.

[0013] In an optional solution, the frame is cross-shaped as a whole, and the connection line between the two groups of inner support components and the connection line between the two mounting plates are perpendicular to each other.

[0014] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: When lifting a large connecting rod cover, the inner support assembly is inserted into the assembly hole on the connecting rod cover and expands, and the lifting device is connected to the connecting rod cover by tightly abutting against the wall of the assembly hole. At the same time, the connecting rod cover is embedded in the clamping assembly to ensure the stability of the connection between the lifting device and the connecting rod cover, thereby ensuring the safety of the lifting operation of the large connecting rod cover. The large connecting rod cover can be lifted safely and smoothly without the help of auxiliary tools. It is simple to operate and easy to use, and can effectively improve the assembly efficiency of marine diesel engines.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are incorporated into and constitute a part of the specification to illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. These drawings and the accompanying description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

[0017] Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the structure of the inner support assembly in an embodiment of the present invention.

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0020] Figure 4 Schematic diagram of the structure of the clamping assembly in an embodiment of the present invention.

[0021] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0022] Figure 6 FIG. 1 is a top view of a frame according to an embodiment of the present invention.

[0023] Notes on figure numbers: 1-frame, 2-inner support assembly, 201-main cylinder, 202-resistance member, 203-rubber pad, 204-sub-cylinder, 205-first sealing piston, 206-first connecting rod, 207-first boss, 208-second boss, 3-clamping assembly, 301-mounting plate, 302-piezoelectric sensing plate, 303-telescopic member, 304-push rod, 305-limiting cap, 306-elastic member, 4-distance adjustment assembly, 401-slide groove, 402-slide seat, 403-bidirectional threaded rod, 404-handwheel, 405-locking knob, 5-pressure control assembly, 501-air control cylinder, 502-bidirectional pressure valve, 503-second sealing piston, 504-second connecting rod, 505-air guide tube. DETAILED DESCRIPTION

[0024] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0025] See also Figure 1 A large connecting rod cover expansion spreader for ships, comprising a frame 1, on which is provided at least one set of inner support components 2 for inserting into assembly holes on the connecting rod cover (i.e., bolt holes for passing bolts to connect the connecting rod cover to the connecting rod body) and expanding and expanding to achieve connection with the connecting rod cover. The expansion spreader also comprises a clamping component 3 for an embedded clamping front end cover.

[0026] When lifting a large connecting rod cover, the inner support component 2 is inserted into the assembly hole on the connecting rod cover and expands, and the lifting device and the connecting rod cover are connected by tightly abutting against the wall of the assembly hole. At the same time, the connecting rod cover is embedded in the clamping component 3 to ensure the stability of the connection between the lifting device and the connecting rod cover, thereby ensuring the safety of the lifting operation of the large connecting rod cover. The large connecting rod cover can be lifted safely and smoothly without the help of auxiliary tools. It is simple to operate and easy to use, and can effectively improve the assembly efficiency of marine diesel engines.

[0027] See also Figure 2 and Figure 3In one embodiment of the present invention, the inner support assembly 2 includes a main cylinder 201 with closed ends and multiple rows of sub-cylinders 204 circumferentially arranged around the central axis of the main cylinder 201, the sub-cylinders 204 are connected to the main cylinder 201, and one end of the sub-cylinders 204 away from the main cylinder 201 is open, and the side of the main cylinder 201 is provided with a resistance member 202 corresponding to the multiple rows of sub-cylinders 204 one by one, and the sub-cylinders 204 are provided with a first sealing piston 205 and a first boss 207 and a second boss 208 for limiting the moving range of the first sealing piston 205, a first connecting rod 206 is provided between the first sealing piston 205 and the corresponding resistance member 202, and the expansion hanger also includes a pressure control assembly 5 for controlling the internal air pressure of the main cylinder 201 to realize the outward expansion / contraction and reset of the multiple resistance members 202.

[0028] In this embodiment, the pressure control component 5 realizes the pressure control function by injecting gas into the main cylinder 201 and extracting gas from the main cylinder 201. Specifically, when the pressure control component 5 injects gas into the main cylinder 201, the internal air pressure will increase, and the air pressure will push the first sealing piston 205 in the sub-cylinder 204 to move away from the main cylinder 201, thereby driving the resistance member 202 to expand outward and tightly abut against the wall of the assembly hole on the connecting rod cover; when the pressure control component 5 extracts air from the main cylinder 201, the internal air pressure will decrease. Under the action of external air pressure, the first sealing piston 205 in the sub-cylinder 204 moves toward the main cylinder 201 to shrink and reset, thereby disconnecting the connection between the inner support component 2 and the connecting rod cover.

[0029] Furthermore, in this embodiment, a rubber pad 203 is provided on the side of the resistance member 202 for contacting the wall of the assembly hole on the front end cover, and adsorption holes are evenly distributed on the rubber pad 203. Preferably, the rubber pad 203 is a rubber pad. By providing the rubber pad 203, the resistance member 202 is not in direct contact with the wall of the assembly hole on the connecting rod cover when it abuts against the wall, thereby playing a protective role and avoiding damage such as pits and indentations on the wall of the assembly hole. In addition, since the rubber pad 203 has a certain elasticity and adsorption holes are distributed on the rubber pad 203, when the rubber pad 203 is squeezed, it will be adsorbed on the wall of the assembly hole under negative pressure, thereby improving the resistance stability between the resistance member 202 and the wall of the assembly hole, that is, improving the internal support stability of the internal support component 2.

[0030] See also Figure 1 、 Figure 4 and Figure 5In one embodiment of the present invention, the clamping assembly 3 includes two parallel mounting plates 301 and two telescopic members 303 for respectively driving the two mounting plates 301 to move toward / away from each other (the telescopic members 303 are electric telescopic rods, hydraulic lifting rods, etc. in the prior art). Push rods 304 are densely arranged in a lattice pattern on the mounting plates 301, and the push rods 304 slide through the mounting plates 301. A piezoelectric sensing plate 302 is provided on the side of the two mounting plates 301 away from each other, and a limiting cap 305 is provided at one end of the push rod 304 close to the piezoelectric sensing plate 302, and an elastic member 306 is sleeved on the rod section of the push rod 304 between the mounting plate 301 and the limiting cap 305, and the two ends of the elastic member 306 are respectively connected to the mounting plate 301 and the limiting cap 305. Preferably, the elastic member 306 is a spring.

[0031] In this embodiment, when lifting, the connecting rod cover is located between the two mounting plates 301, and the two mounting plates 301 are driven to move toward each other by the two telescopic members 303. As the mounting plates 301 approach the connecting rod cover, part of the push rod 304 on the mounting plate 301 comes into contact with the connecting rod and is pushed toward the corresponding piezoelectric sensing plate 302 until it comes into contact with the piezoelectric sensing plate 302, indicating that the contact is in place, and the corresponding telescopic member 303 stops moving. After both mounting plates 301 have completed the contact, it means that the connecting rod cover is clamped in place (the telescopic members 303 corresponding to the two mounting plates 301 work independently, and the limit position at the end of the push rod 304 is adjusted). After the cap 305 contacts the corresponding piezoelectric sensing plate 302, a voltage signal is generated, which is then converted and processed to obtain a command signal to control the corresponding telescopic part 303 to stop moving. The corresponding control technology is existing technology, so the software and hardware and the corresponding logic and connection relationship for realizing the above-mentioned control function are not described here). The push rod 304 in contact with the connecting rod cover moves toward the corresponding piezoelectric sensing plate 302 to form a depression that is compatible with the side contour (part) of the connecting rod cover. The two sides of the connecting rod cover are embedded in the depression, thereby realizing the clamping protection of the connecting rod cover, ensuring the stability of the connection between the lifting device and the connecting rod cover, and then ensuring the safety of the lifting operation of large connecting rod covers.

[0032] See also Figure 1 and Figure 4In one embodiment of the present invention, the pressure control assembly 5 includes an air control cylinder 501 provided on the frame 1 and two second sealing pistons 503 provided in the air control cylinder 501. The air control cylinder 501 is located between the two mounting plates 301. The two second sealing pistons 503 correspond to the two mounting plates 301 respectively, and a second connecting rod 504 is provided between the second sealing pistons 503 and the corresponding mounting plates 301. A communicating air guide pipe 505 is provided between the air control cylinder 501 and the main cylinder body 201. The air control cylinder 501 is also provided with a two-way pressure valve 502 (centrally arranged) for maintaining the internal air pressure of the air control cylinder 501 within a set range. The two-way pressure valve 502 can be either electronic or mechanical, which is not limited in this embodiment.

[0033] When the two mounting plates 301 move in opposite directions to clamp the connecting rod cover, the two second sealing pistons 503 are pushed toward the center of the air control cylinder 501, thereby injecting air into the main cylinder 201, so that the expansion and expansion action of the inner support assembly 2 is completed synchronously during the clamping process. On the contrary, when the two mounting plates 301 move in opposite directions to loosen the connecting rod cover, the two second sealing pistons 503 are pulled toward the square away from the center of the air control cylinder 501, thereby extracting air from the cylinder 201, so that the contraction and reset action of the inner support assembly 2 is completed synchronously during the loosening process. It should be noted that the diameter of the air control cylinder 501 is large, and the amount of air injected and extracted fully meets the expansion, expansion / contraction and reset requirements of the inner support assembly 2, so that it is suitable for connecting rod covers of different specifications. There is no situation where the inner support assembly 2 is not fully expanded and expanded after the clamping assembly 3 clamps the connecting rod cover in place (fully expanded and expanded means that the contact member 202 reaches a state of close contact with the wall of the assembly hole). By setting a two-way pressure valve 5 02 maintains the internal air pressure of the air control cylinder 501 within a certain range. During air injection, when the inner support assembly 2 is fully expanded and stretched, the internal air pressure of the air control cylinder 501 will continue to increase. When the air pressure reaches the upper limit threshold of the two-way pressure valve 502 (the upper limit threshold represents the contact strength between the inner support assembly 2 and the wall of the assembly hole after it is fully expanded and stretched. The larger the upper limit threshold, the tighter the contact between the inner support assembly 2 and the assembly hole, and the higher the firmness. The upper limit threshold fully meets the requirements for lifting the connecting rod cover), the two-way pressure valve 502 opens to release the pressure and maintain the internal air pressure of the air control cylinder 501 within the upper limit air pressure range. Similarly, when air is extracted from the cylinder body 201, the inner support assembly 2 shrinks and resets. As the two second sealing pistons 503 move toward the square away from the center of the air control cylinder 501, the air pressure in the air control cylinder 501 continues to decrease. When the air pressure drops to the lower limit threshold of the two-way pressure valve 502, the two-way pressure valve 502 opens to allow external air to enter to maintain the internal air pressure of the air control cylinder 501 within the lower limit air pressure range.

[0034] See also Figure 1 and Figure 6In one embodiment of the present invention, the inner support assembly 2 is provided in two groups, and the distance between the two groups of inner support assemblies 2 is adjustable to adapt to the spacing of the assembly holes provided on both sides of the front end cover of different specifications. The expansion spreader further includes a distance adjustment assembly 4 for adjusting the distance between the two groups of inner support assemblies 2; The distance adjustment component 4 includes two slide grooves 401 provided on the frame 1 and two slide seats 402 that are respectively slidably clamped in the two slide grooves 401. The two groups of the internal support components 2 are respectively provided on the two slide seats 402. The frame 1 is also provided with a two-way threaded rod 403 for rotation. The two rod sections of the two-way threaded rod 403 with opposite thread directions respectively pass through the two slide seats 402 in a threaded matching manner; it should be noted that: generally speaking, there is at least one group of symmetrical assembly holes on a large connecting rod cover, that is, one is provided on each side of the connecting rod cover. By providing two groups of internal support components 2 that are symmetrically inserted into the assembly holes on both sides of the connecting rod cover and expanded and expanded, symmetrical lifting is performed to improve the lifting stability of the connecting rod cover. By rotating the two-way threaded rod 403 to drive the two slide seats 402 to slide toward / away from each other, the spacing between the two groups of internal support components 2 can be adjusted to match the spacing of the assembly holes provided on both sides of the lifted front end cover.

[0035] Furthermore, in this embodiment, a handwheel 404 is provided at one end of the bidirectional threaded rod 403, and a locking knob 405 for positioning the bidirectional threaded rod 403 is also provided on the frame 1. The bidirectional threaded rod 403 is rotated by the handwheel 404, and after being adjusted into position, the locking knob 405 is tightened to press the bidirectional threaded rod 403 into position.

[0036] Furthermore, in this embodiment, the frame 1 is cross-shaped as a whole, and the line connecting the two groups of the inner support components 2 and the line connecting the two mounting plates 301 are perpendicular to each other.

[0037] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A large connecting rod cover expansion hanger for ships, comprising a frame (1), characterized in that: The frame (1) is provided with at least one set of inner support components (2) for inserting into the assembly hole on the connecting rod cover and expanding and expanding to achieve connection with the connecting rod cover. The expansion sling also includes a clamping component (3) for the embedded clamping front end cover. The clamping assembly (3) comprises two mounting plates (301) arranged in parallel and capable of moving toward or away from each other, wherein push rods (304) are densely arranged in a lattice pattern on the mounting plates (301), and the push rods (304) slide through the mounting plates (301).

2. The large connecting rod cover expansion hanger for ships according to claim 1, characterized in that: The inner support assembly (2) comprises a main cylinder (201) with closed ends and multiple rows of sub-cylinders (204) circumferentially arranged around the central axis of the main cylinder (201), the sub-cylinders (204) being connected to the main cylinder (201), and one end of the sub-cylinders (204) away from the main cylinder (201) being open, and a resistance member (202) corresponding to the multiple rows of sub-cylinders (204) is provided on the side of the main cylinder (201), a first sealing piston (205) and a first boss (207) and a second boss (208) for limiting the moving range of the first sealing piston (205) are provided in the sub-cylinders (204), a first connecting rod (206) is provided between the first sealing piston (205) and the corresponding resistance member (202), and the expansion sling further comprises a pressure control assembly (5) for controlling the internal air pressure of the main cylinder (201) to realize the outward expansion, expansion / contraction and reset of the multiple resistance members (202).

3. The large connecting rod cover expansion hanger for ships according to claim 2, characterized in that: A rubber pad (203) is provided on the side of the resisting member (202) that is used to contact the wall of the assembly hole on the front end cover, and adsorption holes are evenly distributed on the rubber pad (203).

4. The large connecting rod cover expansion hanger for ships according to claim 1, characterized in that: The clamping assembly (3) further comprises two telescopic members (303) for respectively driving the two mounting plates (301) to move toward / away from each other, a piezoelectric sensing plate (302) being provided on each side of the two mounting plates (301) away from each other, a limiting cap (305) being provided on one end of the push rod (304) close to the piezoelectric sensing plate (302), and an elastic member (306) being sleeved on the rod section of the push rod (304) located between the mounting plate (301) and the limiting cap (305), the two ends of the elastic member (306) being respectively connected to the mounting plate (301) and the limiting cap (305).

5. The large connecting rod cover expansion hanger for ships according to claim 2, characterized in that: The pressure control assembly (5) comprises an air control cylinder (501) arranged on a frame (1) and two second sealing pistons (503) arranged in the air control cylinder (501); the air control cylinder (501) is located between two mounting plates (301); the two second sealing pistons (503) correspond to the two mounting plates (301), respectively; a second connecting rod (504) is provided between the second sealing pistons (503) and the corresponding mounting plates (301); an air guide tube (505) is provided between the air control cylinder (501) and the main cylinder body (201); and a two-way pressure valve (502) is further provided on the air control cylinder (501) for maintaining the internal air pressure of the air control cylinder (501) within a set range.

6. The large connecting rod cover expansion hanger for ships according to claim 1, characterized in that: The inner support assembly (2) is provided in two groups, and the spacing between the two groups of inner support assemblies (2) is adjustable to adapt to the spacing of the assembly holes provided on both sides of the front end cover of different specifications. The expansion hanger also includes a spacing adjustment assembly (4) for achieving the spacing adjustment of the two groups of inner support assemblies (2).

7. The large connecting rod cover expansion hanger for ships according to claim 6, characterized in that: The distance adjustment component (4) includes two slide grooves (401) provided on the frame (1) and two slide seats (402) respectively slidably clamped in the two slide grooves (401). The two groups of the inner support components (2) are respectively provided on the two slide seats (402). A bidirectional threaded rod (403) is also rotatably provided on the frame (1). The two rod sections of the bidirectional threaded rod (403) with opposite thread directions respectively penetrate the two slide seats (402) in a threaded matching manner.

8. The large connecting rod cover expansion hanger for ships according to claim 7, characterized in that: A hand wheel (404) is provided at one end of the bidirectional threaded rod (403), and a locking knob (405) for positioning the bidirectional threaded rod (403) is also provided on the frame (1). The large connecting rod cover expansion hanger for ships according to claim 6 is characterized in that: The frame (1) is cross-shaped as a whole, and the connection line between the two groups of inner support components (2) and the connection line between the two mounting plates (301) are perpendicular to each other.

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