Diesel engine piston connecting rod dismounting guiding protection device

Abstract

The utility model discloses a diesel engine piston connecting rod dismounting guiding protection device which comprises a connecting part used for being connected with a water jacket of a diesel engine and a positioning part used for being installed on a cylinder sleeve of the diesel engine, and the positioning part is provided with a contact end making contact with the top end face of the cylinder sleeve and a free end arranged away from the contact end. The positioning part is provided with a through hole for a piston connecting rod mechanism of the diesel engine to penetrate through, and the through hole is sequentially provided with a chamfering section, a guiding section and a limiting section in the direction from the free end to the contact end. The guide protection device for disassembling the piston connecting rod of the diesel engine can safely guide the piston connecting rod mechanism to be hoisted out of a cylinder sleeve and a water sleeve, the piston connecting rod mechanism is prevented from colliding with the cylinder sleeve and the water sleeve, and the piston connecting rod mechanism can be smoothly hoisted out of the cylinder sleeve and the water sleeve through the guide supporting structure of the positioning part and the conical gradually-changed opening. Stress of the piston ring is gradually released, abrasion is reduced, guiding and protecting effects are achieved, and damage to equipment and personnel possibly caused when people hold the connecting rod is prevented.

Description

Technical Field

[0001] The utility model relates to the field of diesel engine maintenance in nuclear power plants, in particular to a diesel engine piston connecting rod disassembly guide protection device. Background Art

[0002] There are several PC2-6B diesel engines in the nuclear power plant. When the piston connecting rod needs to be removed for a full inspection or emergency repair of the diesel engine, there is a lack of a guide protection device for the piston connecting rod when it comes out of the cylinder sleeve. When the big end of the connecting rod is lifted to be removed from the cylinder sleeve, it is necessary to manually hold the connecting rod to prevent the big end of the connecting rod from colliding with the diesel engine water jacket through the pendulum effect under the action of gravity, causing damage to the water jacket sealing surface. There is also a risk of collision and personal injury when holding the connecting rod. More specifically, the diesel engine is a PC-type diesel engine structure. The main body of the diesel engine is tilted in a vertical direction to the ground. When the connecting rod is about to come out of the cylinder sleeve, there will be a pendulum effect, and the connecting rod will swing and collide with the water jacket sealing surface, which may easily cause damage to the water jacket. If you think that you should hold the connecting rod in advance, it may cause excessive force to damage the cylinder sleeve in advance. If you use too little force, you cannot hold the connecting rod and cause damage to the water jacket. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a disassembly guide protection device for a piston connecting rod of a diesel engine.

[0004] The technical solution adopted by the utility model to solve the technical problem is: construct a diesel engine piston connecting rod disassembly guide protection device, which includes a connecting part for connecting with the water jacket of the diesel engine and a positioning part for installing on the cylinder sleeve of the diesel engine, and the connecting part and the positioning part are integrally formed;

[0005] The positioning portion has a contact end in contact with the top end surface of the cylinder sleeve and a free end arranged away from the contact end. The positioning portion is provided with a through hole for the piston connecting rod mechanism of the diesel engine to pass through. The through hole is provided with a chamfered section, a guide section and a limit section in sequence from the free end toward the contact end.

[0006] The cross-sectional area of ​​the guide section gradually decreases in a direction from the free end toward the contact end, and the limiting section is perpendicular to the top end surface of the cylinder sleeve.

[0007] In some embodiments, the positioning portion includes a retaining block located on an end surface of the contact end thereof, and the retaining block is used to be installed in a positioning groove on the cylinder sleeve;

[0008] The axial length of the retaining block is 3 mm, and the wall thickness of the retaining block is 5 mm.

[0009] In some embodiments, a plurality of mounting holes are provided on the connecting portion, so that the diesel engine piston connecting rod disassembly guide protection device can be connected to the water jacket by fasteners passing through the mounting holes.

[0010] In some embodiments, a plurality of lifting holes are also provided on the connecting portion, so that the diesel engine piston connecting rod disassembly guide protection device can be lifted through the lifting holes.

[0011] In some embodiments, the number of the mounting holes is four, and the number of the lifting holes is two to eight.

[0012] In some embodiments, the peripheral side end surface of the positioning portion is perpendicular to the top end surface of the cylinder sleeve, and the diameter of the peripheral side end surface of the positioning portion is smaller than the inner diameter of the water jacket.

[0013] In some embodiments, the cross-sectional end face diameter of the guide section near the free end is 425 mm, the cross-sectional end face diameter of the guide section near the contact end is 400 mm, and the diameter of the limiting section is consistent with the diameter of the guide section near the contact end;

[0014] The axial length of the limiting section is 20 mm.

[0015] In some embodiments, the chamfered section has a size of 15 x 15°.

[0016] In some embodiments, the axial length of the positioning portion is not less than 200 mm.

[0017] In some embodiments, the roughness of the through hole is less than or equal to 0.4.

[0018] The implementation of the utility model has the following beneficial effects: the diesel engine piston connecting rod disassembly guide protection device can safely guide the piston connecting rod mechanism to be lifted out of the cylinder liner and the water jacket, avoid the piston connecting rod mechanism from colliding with the cylinder liner and the water jacket, and utilize the guide support structure of the positioning part and the tapered gradual opening to allow the piston connecting rod mechanism to be smoothly lifted out of the cylinder liner and the water jacket, and gradually release the stress of the piston ring, reduce wear, play a guiding and protective role, prevent the big end of the connecting rod, the cylinder liner and the water jacket from being damaged in sealing, and at the same time prevent equipment and personnel damage that may be caused by people holding the connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0020] Figure 1 It is an application schematic diagram of the diesel engine piston connecting rod disassembly guide protection device of the utility model;

[0021] Figure 2 It is a front view cross-sectional schematic diagram of a diesel engine piston connecting rod disassembly guide protection device of the utility model;

[0022] Figure 3 The utility model is a top view of the diesel engine piston connecting rod disassembly guide protection device. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0024] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0025] Reference Figures 1 to 3 , is a diesel engine piston connecting rod disassembly guide protection device in some embodiments of the utility model. In this embodiment, Figure 1As shown, the diesel engine includes a water jacket 11, a cylinder sleeve 12, and a piston connecting rod mechanism 13. The water jacket 11 is installed at the peripheral side of the cylinder sleeve 12, and the piston connecting rod mechanism 13 is installed on the inner wall of the cylinder sleeve 12. The piston connecting rod mechanism 13 includes a piston and a connecting rod. The piston and the connecting rod are connected by a connecting rod pin. A number of piston rings are also installed on the piston. The connection structure of the diesel engine is a prior art and will not be repeated here. The main body of the diesel engine is tilted in the vertical direction of the ground. When the piston connecting rod needs to be disassembled for a full inspection or emergency repair of the diesel engine, when the large end 14 of the connecting rod is hoisted to be removed from the cylinder sleeve 12, the connecting rod will have a pendulum effect under the action of gravity. The connecting rod will swing and collide with the sealing surface of the water jacket 11, and it is also easy to cause damage to the cylinder sleeve 12. Therefore, the diesel engine piston connecting rod disassembly guide protection device is set to solve the above problem.

[0026] Specifically, Figure 2 As shown, the diesel engine piston connecting rod disassembly guide protection device includes a connecting portion 2 for connecting to the water jacket 11 of the diesel engine and a positioning portion 3 for mounting on the cylinder liner 12. The connecting portion 2 and the positioning portion 3 are integrally formed. It can be understood that there is an installation space between the water jacket 11 and the piston connecting rod mechanism 13 for accommodating the positioning portion 3. Figure 3 As shown, a plurality of mounting holes 21 are provided on the connecting portion 2, so that the diesel engine piston connecting rod disassembly guide protection device can be connected to the water jacket 11 through fasteners passing through the mounting holes 21. In this embodiment, the number of the connecting portions 2 is four, and the four connecting portions 2 are evenly arranged along the circumferential direction of the positioning portion 3. The diesel engine piston connecting rod disassembly guide protection device can be installed as a whole on the water jacket 11 by using fasteners, thereby realizing the connection between the diesel engine piston connecting rod disassembly guide protection device and the diesel engine.

[0027] Preferably, the roughness of the through hole 33 is less than or equal to 0.4, which can prevent the positioning portion 3 from scratching the piston and the piston ring when the piston-connecting rod mechanism 13 is disassembled.

[0028] In addition, if Figure 3 As shown, the connecting portion 2 is also provided with a plurality of hoisting holes 22, so that the diesel engine piston connecting rod disassembly guide protection device can be hoisted through the hoisting holes 22, and the number of the hoisting holes 22 is two to eight. In this embodiment, the number of the hoisting holes 22 is four.

[0029] like Figure 1As shown, the peripheral side end surface of the positioning portion 3 is perpendicular to the top end surface of the cylinder sleeve 12, and the diameter of the peripheral side end surface of the positioning portion 3 is smaller than the inner diameter of the water jacket 11. In this embodiment, the inner diameter of the water jacket 11 is 515mm, and the diameter of the peripheral side end surface of the positioning portion 3 is 0.03-0.1mm smaller than the inner diameter of the water jacket 11, so as to facilitate the installation and removal of the diesel engine piston connecting rod disassembly guide protection device. And the axial length of the positioning portion 3 is not less than 200mm, which can ensure that the connecting rod big end 14 can be smoothly moved out of the cylinder sleeve 12.

[0030] The diesel engine piston connecting rod disassembly guide protection device as a whole can be cast by molten iron or forged, and then machined and turned before being polished. In addition, the diesel engine piston connecting rod disassembly guide protection device as a whole can be made of a material with a hardness lower than that of the cylinder liner 12 to avoid damage to the cylinder liner 12 when the diesel engine piston connecting rod disassembly guide protection device contacts the cylinder liner 12. The material can be an aluminum material.

[0031] For example Figure 1 As shown, the positioning part 3 has a contact end 31 that contacts the top surface of the cylinder sleeve 12 and a free end 32 that is arranged away from the contact end 31. The positioning part 3 is provided with a through hole 33 for the piston connecting rod mechanism 13 of the diesel engine to pass through. The piston connecting rod mechanism 13 can pass through the through hole 33 to move out of the cylinder sleeve 12. The through hole 33 is provided with a chamfered section 331, a guide section 332 and a limit section 333 in sequence from the free end 32 to the contact end 31. The cross-sectional area of ​​the guide section 332 gradually decreases along the direction from the free end 32 to the contact end 31, and the limit section 333 is perpendicular to the top surface of the cylinder sleeve 12. It can be understood that the guide section 332 is a tapered gradual opening as a whole, which allows the piston connecting rod to be smoothly lifted out of the cylinder sleeve 12 and the water jacket 11, and gradually releases the stress of the piston ring, reduces wear, plays a guiding and protective role, prevents the sealing of the connecting rod big end 14, the cylinder sleeve 12 and the water jacket 11 from being damaged, and prevents equipment and personnel damage that may be caused by people holding the connecting rod. Specifically, the cross-sectional end face diameter of the guide section 332 close to the free end 32 is 425 mm, the cross-sectional end face diameter of the guide section 332 close to the contact end 31 is 400 mm, and the cross-sectional end face diameter of the guide section 332 close to the contact end 31 is the same size as the inner diameter of the cylinder sleeve 12 .

[0032] There is a smooth transition between the limiting section 333 and the guiding section 332. The limiting section 333 is used to be installed on the positioning groove 121 on the cylinder sleeve 12 for positioning the positioning part 3. The diameter of the limiting section 333 is consistent with the diameter of the guiding section 332 close to the contact end 31, which is also 400 mm. The axial length of the limiting section 333 is 20 mm. The axial length of the limiting section 333 can provide a certain positioning and limiting effect for the positioning part 3.

[0033] Furthermore, the positioning portion 3 includes a retaining block 34 located on the end face of its contact end 31, and the retaining block 34 is used to be installed in the positioning groove 121 on the cylinder liner 12. It can be understood that since there is a positioning groove 121 on the cylinder liner 12, the positioning portion 3 can be installed in the positioning groove 121 using the retaining block 34 to achieve positioning. A part of the above-mentioned limiting section 333 is located on the inner wall surface of the retaining block 34. In this embodiment, the axial length of the retaining block 34 is 3mm, the wall thickness of the retaining block 34 is 5mm, the roughness of the circumferential end face of the retaining block 34 is less than or equal to 3.2, the plane verticality is less than or equal to 0.02mm, and the positioning accuracy is less than or equal to 0.02mm. The retaining block 34 as a whole plays a guiding and positioning role.

[0034] In addition, the size of the chamfered section 331 is preferably 15×15°. The chamfered section 331 is provided to facilitate the slow movement of the connecting rod big end 14, and plays a role in transition and preventing scratches.

[0035] In general, the diesel engine piston connecting rod disassembly guide protection device can safely guide the piston connecting rod mechanism 13 to be lifted out of the cylinder liner 12 and the water jacket 11, avoid the piston connecting rod mechanism 13 from colliding with the cylinder liner 12 and the water jacket 11, and utilize the guiding support structure of the positioning part 3 and the tapered gradual opening to allow the piston connecting rod mechanism 13 to be smoothly lifted out of the cylinder liner 12 and the water jacket 11, and gradually release the stress of the piston ring, reduce wear, play a guiding and protective role, prevent the connecting rod big end 14, cylinder liner 12 and water jacket 11 from being damaged in sealing, and prevent equipment and personnel damage that may be caused by people holding the connecting rod.

[0036] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and multiple deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A diesel engine piston connecting rod disassembly guide protection device, characterized in that: It comprises a connecting portion (2) for connecting to a water jacket (11) of a diesel engine and a positioning portion (3) for being mounted on a cylinder liner (12) of the diesel engine, wherein the connecting portion (2) and the positioning portion (3) are integrally formed; The positioning portion (3) comprises a contact end (31) in contact with the top end surface of the cylinder sleeve (12) and a free end (32) arranged away from the contact end (31); a through hole (33) for a piston connecting rod mechanism (13) of the diesel engine to pass through is provided on the positioning portion (3); and the through hole (33) is provided with a chamfered section (331), a guide section (332) and a limit section (333) in sequence from the free end (32) toward the contact end (31); The cross-sectional area of ​​the guide section (332) gradually decreases in a direction from the free end (32) toward the contact end (31), and the limiting section (333) is perpendicular to the top end surface of the cylinder sleeve (12).

2. The diesel engine piston connecting rod disassembly guide protection device according to claim 1, characterized in that: The positioning portion (3) comprises a retaining block (34) located on the end surface of the contact end (31) thereof, and the retaining block (34) is used to be installed in the positioning groove (121) on the cylinder sleeve (12); The axial length of the retaining block (34) is 3 mm, and the wall thickness of the retaining block (34) is 5 mm.

3. The diesel engine piston connecting rod disassembly guide protection device according to claim 1, characterized in that: The connecting portion (2) is provided with a plurality of mounting holes (21), so that the diesel engine piston connecting rod disassembly guide protection device can be connected to the water jacket (11) by fasteners passing through the mounting holes (21).

4. The diesel engine piston connecting rod disassembly guide protection device according to claim 3, characterized in that: The connecting portion (2) is also provided with a plurality of lifting holes (22), so that the diesel engine piston connecting rod disassembly guide protection device can be lifted through the lifting holes (22).

5. The diesel engine piston connecting rod disassembly guide protection device according to claim 4, characterized in that: The number of the mounting holes (21) is four, and the number of the hoisting holes (22) is two to eight.

6. The diesel engine piston connecting rod disassembly guide protection device according to claim 1, characterized in that: The peripheral end surface of the positioning portion (3) is arranged perpendicularly to the top end surface of the cylinder sleeve (12), and the diameter of the peripheral end surface of the positioning portion (3) is smaller than the inner diameter of the water jacket (11).

7. The diesel engine piston connecting rod disassembly guide protection device according to claim 1, characterized in that: The cross-sectional end face diameter of the guide section (332) close to the free end (32) is 425 mm, the cross-sectional end face diameter of the guide section (332) close to the contact end (31) is 400 mm, and the diameter of the limiting section (333) is consistent with the diameter of the guide section (332) close to the contact end (31); The axial length of the limiting section (333) is 20 mm.

8. The diesel engine piston connecting rod disassembly guide protection device according to claim 1, characterized in that: The size of the chamfered section (331) is 15×15°.

9. The diesel engine piston connecting rod disassembly guide protection device according to claim 1, characterized in that: The axial length of the positioning portion (3) is not less than 200 mm.

10. The diesel engine piston connecting rod disassembly guide protection device according to claim 1, characterized in that: The roughness of the through hole (33) is less than or equal to 0.4.

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