Marine low-speed diesel engine bearing bush positioning clamp

Abstract

The utility model discloses a marine low-speed diesel engine bearing bush positioning clamp, and belongs to the field of machining. The clamp mainly comprises a positioning seat, a guide cover plate, a locking nut and a screw rod. The positioning base is provided with a positioning outer circle, a positioning inclined face and a positioning inner hole which are coaxially arranged, a bolt hole is formed in the bottom of the positioning base, and the positioning base can be fixed to machining equipment. The guide cover plate is provided with a guide part and a positioning inclined plane which are coaxially arranged. During use, the positioning seat is used for positioning the outer circle of the marine low-speed diesel engine bearing bush, the marine low-speed diesel engine bearing bush is clamped by the positioning seat and the two inclined surfaces of the guide cover plate, so that the non-circular marine low-speed diesel engine bearing bush is kept in a circular state in a natural state, and the outer circle is ground.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing tooling, in particular to a bearing bush positioning fixture for a low-speed marine diesel engine. Background Art

[0002] The bearing shell for a low-speed marine diesel engine is a relatively large, thin-walled, semicircular part, typically measuring 400-1000mm. The outer ring is typically made of low-carbon steel, while the inner ring is typically constructed of a relatively low-hardness alloy. Due to elasticity in their natural state, their outer shape is not a standard arc, making external cylindrical grinding extremely difficult. However, the requirements for the outer cylindrical surface of such bearing shells are very stringent, with roughness generally required to be within Ra0.8, a wall thickness difference of 0.015mm, and an outer cylindrical straightness of 0.02mm. Given these characteristics of bearing shells for low-speed marine diesel engines, the technical problem to be solved by this utility model is to provide a cylindrical grinding fixture for bearing shells for low-speed marine diesel engines. Utility Model Content

[0003] In response to the above situation, this solution provides a low-speed diesel engine marine low-speed diesel engine bearing positioning fixture, which is used to fix the semi-circular non-circular marine low-speed diesel engine bearing into a circle, thereby realizing the external cylindrical grinding of the marine low-speed diesel engine bearing.

[0004] The technical solution of the utility model is:

[0005] The present application provides a bearing bush positioning fixture for a low-speed marine diesel engine, comprising: a detachably connected positioning seat and a guide cover plate;

[0006] A positioning inner hole is formed on the end surface of the positioning seat facing the guide cover plate, and the guide portion of the guide cover plate is partially inserted into the positioning inner hole;

[0007] The positioning outer circle of the positioning seat is used to position the low-speed diesel engine bearing to be processed, and the positioning outer circle of the positioning seat is provided with a first positioning inclined surface that matches the positioning inclined surface at one end of the low-speed diesel engine bearing to be processed;

[0008] The end surface of the guide cover plate facing the positioning seat is provided with a second positioning inclined surface that matches the positioning inclined surface of the other end of the bearing shell of the low-speed diesel engine for marine use to be processed;

[0009] A clamping space for the bearing shell of a low-speed marine diesel engine to be processed is formed between the first positioning inclined surface and the second positioning inclined surface.

[0010] Preferably, the low-speed diesel engine marine low-speed diesel engine bearing bush positioning fixture further comprises: a bottom locking nut, a screw and a top locking nut;

[0011] One end of the screw passes through the guide cover and is inserted into the positioning seat;

[0012] The bottom locking nut and the top locking nut are respectively locked with the screw rod, so that the bearing shell of the low-speed diesel engine for marine use to be processed is clamped between the positioning seat and the guide cover plate.

[0013] Preferably, at least one bolt hole is provided at the bottom of the positioning seat.

[0014] Preferably, the size of the positioning outer circle of the positioning seat is larger than the size of the inner hole of the bearing shell of the low-speed marine diesel engine to be processed.

[0015] Preferably, a boss is protruding from the outer surface of the positioning outer circle, the first positioning inclined surface is formed by grooving on the boss, and the outer circle surface of the low-speed diesel engine bearing to be processed exceeds the outer wall of the boss.

[0016] The beneficial effects of the utility model are:

[0017] 1) The positioning seat and the guide cover are connected through an intermediate guide, ensuring that the upper and lower inclined surfaces of the positioning seat and the guide cover are coaxially arranged and stable;

[0018] 2) The non-circular marine low-speed diesel engine bearing is fixed into a circular shape through the positioning outer circle of the positioning seat, the first positioning inclined surface and the second positioning inclined surface of the guide cover, and the structure is stable and reliable;

[0019] 3) Solved the problem that the non-circular marine low-speed diesel engine bearings could not be ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a bearing positioning fixture for a low-speed marine diesel engine in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A magnified schematic diagram of point A;

[0022] Description of reference numerals:

[0023] 1-positioning seat; 2-bottom locking nut; 3-screw; 4-guide cover plate; 5-marine low-speed diesel engine bearing; 6-top locking nut; 11-positioning inner hole; 12-bolt hole; 13-first positioning inclined surface; 14-positioning outer circle; 41-guide portion; 141-boss. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] Reference Figure 1 and Figure 2 The embodiment of the present application provides a bearing positioning fixture for a low-speed marine diesel engine, comprising: a positioning seat 1, a bottom locking nut 2, a screw 3 and a guide cover plate 4.

[0026] The positioning seat 1 is provided with a positioning inner hole 11 on the end surface facing the guide cover plate 4, and the guide portion 41 of the guide cover plate 4 is partially inserted into the positioning inner hole 11;

[0027] The positioning outer circle 14 of the positioning seat 1 is used to position the low-speed diesel engine, marine low-speed diesel engine bearing 5 to be processed, and the positioning outer circle 14 of the positioning seat 1 is provided with a first positioning inclined surface 13 that matches the positioning inclined surface at one end of the low-speed diesel engine, marine low-speed diesel engine bearing 5 to be processed; the guide cover plate 4 is provided with a second positioning inclined surface on the end face facing the positioning seat 1 that matches the positioning inclined surface at the other end of the low-speed diesel engine, marine low-speed diesel engine bearing 5 to be processed; a clamping space for the low-speed diesel engine, marine low-speed diesel engine bearing 5 to be processed is formed between the first positioning inclined surface 13 and the second positioning inclined surface.

[0028] The guide cover plate 4 is designed with the same positioning inclined surface as the positioning seat 1 and is also designed with a guide portion 41 . The guide portion 41 plays a guiding role to ensure that the guide cover plate 4 has the freedom to move up and down.

[0029] The positioning inner hole 11 of the positioning seat 1 is assembled with the guide portion 41 of the guide cover plate 4 to ensure that the positioning seat 1 and the guide cover plate 4 are coaxially arranged.

[0030] Reference Figure 1 The low-speed diesel engine and marine low-speed diesel engine bearing positioning fixture also includes: a bottom locking nut 2, a screw 3 and a top locking nut 6; one end of the screw 3 passes through the guide cover plate 4 and is inserted into the positioning seat 1; the bottom locking nut 2 and the top locking nut 6 are respectively locked with the screw 3, and the low-speed diesel engine and marine low-speed diesel engine bearing 5 to be processed is clamped between the positioning seat 1 and the guide cover plate 4.

[0031] The bottom of the positioning seat 1 is designed with four bolt holes 12 for fixing the marine low-speed diesel engine bearing bush positioning fixture in this embodiment on the equipment workbench.

[0032] The positioning outer circle 14 of the positioning seat 1 is designed according to the inner hole of the marine low-speed diesel engine bearing 5 of the marine low-speed engine. The outer circle diameter of the positioning outer circle 14 is slightly larger than the inner hole size of the marine low-speed diesel engine bearing 5, so that the marine low-speed diesel engine bearing 5 can fit tightly; the first positioning inclined surface 13 of the positioning seat 1 and the first positioning inclined surface of the guide cover plate 4 are both designed according to the wall thickness of the marine low-speed diesel engine bearing. The outer sides of the first positioning inclined surface 13 of the positioning seat 1 and the second positioning inclined surface of the guide cover plate 4 do not exceed the outer circle of the marine low-speed diesel engine bearing 5, which is convenient for the outer circle grinding of the marine low-speed diesel engine bearing 5; the angle of the first positioning inclined surface 13 and the angle of the second positioning inclined surface both match the inclined surfaces on both sides of the marine low-speed diesel engine bearing 5.

[0033] By utilizing the first positioning bevel 13 of the positioning seat 1 and the second positioning bevel of the guide cover plate 4, the positioning seat 1 and the guide cover plate 4 can make the inner hole of the non-circular marine low-speed diesel engine bearing 5 tightly attached to the positioning outer circle 14 of the positioning seat 1 in a natural state. The positioning outer circle 14 and the two positioning bevels fix the lower end of the non-circular marine low-speed diesel engine bearing into a circular shape. After the bottom locking nut 2 and the screw 3 lock and clamp the marine low-speed diesel engine bearing, the outer cylindrical grinding process can be performed.

[0034] Reference Figure 1 A boss 141 is protrudingly provided on the outer surface of the positioning outer circle 14 , and the first positioning inclined surface 13 is formed by grooving on the boss 141 , and the outer circle surface of the low-speed diesel engine marine low-speed diesel engine bearing 5 to be processed exceeds the outer wall of the boss 141 .

[0035] Reference Figure 1 and Figure 2 Before processing the marine low-speed diesel engine bearing bush positioning fixture in the embodiment of the present application, it is necessary to first process the two ends of the marine low-speed diesel engine bearing bush 5 into outer circular inclined surfaces with the same angles as the first positioning inclined surface 13 and the second positioning inclined surface of the fixture.

[0036] Reference Figure 1 and Figure 2 The assembly process of the bearing positioning fixture for a low-speed marine diesel engine in the embodiment of the present application includes:

[0037] S1. Install the bearing positioning fixture for marine low-speed diesel engines on the equipment workbench.

[0038] The step S1 specifically includes: first aligning the positioning outer circle 14 of the positioning seat 1 to determine the position; then installing the positioning seat 1 on the equipment workbench through the four bolt holes 12 on the outer ring of the bottom of the positioning seat 1; finally, inserting the screw 3 into the assembly hole of the positioning seat 1, and then tightening the screw 3 and the bottom locking nut 2.

[0039] S2. Install two marine low-speed diesel engine bearing shells 5 onto the fixture.

[0040] Step S2 specifically includes: first aligning the inner hole of the marine low-speed diesel engine bearing 5 with the positioning outer circle 14 of the positioning seat 1, so that the outer circle bevel 51 at the lower end of the marine low-speed diesel engine bearing 5 is engaged with the first positioning bevel 13 of the positioning seat 1; then inserting the guide portion 41 of the guide cover plate 4 into the positioning inner hole 11 of the positioning seat 1, so that the second positioning bevel of the guide cover plate 4 contacts the outer circle bevel at the upper end of the marine low-speed diesel engine bearing 5. Finally, tightening the top locking nut 6 and the screw 3.

[0041] S3. Turn on the equipment to perform external cylindrical grinding.

[0042] S4. After the processing is completed, loosen the top locking nut 6, remove the guide cover 4, and then remove the marine low-speed diesel engine bearing 5.

Claims

1. A bearing positioning fixture for a low-speed marine diesel engine, characterized in that: include: A detachably connected positioning seat (1) and a guide cover plate (4); A positioning inner hole (11) is provided on the end surface of the positioning seat (1) facing the guide cover plate (4), and the guide portion (41) of the guide cover plate (4) is partially inserted into the positioning inner hole (11); The positioning outer circle (14) of the positioning seat (1) is used to position the low-speed diesel engine bearing (5) to be processed, and a first positioning inclined surface (13) matching the positioning inclined surface at one end of the low-speed diesel engine bearing (5) to be processed is provided on the positioning outer circle (14) of the positioning seat (1); The guide cover plate (4) is provided with a second positioning inclined surface on the end surface facing the positioning seat (1) that matches the positioning inclined surface on the other end of the low-speed diesel engine marine low-speed diesel engine bearing bush (5) to be processed; A clamping space for a low-speed diesel engine bearing bush (5) for a marine low-speed diesel engine to be processed is formed between the first positioning inclined surface (13) and the second positioning inclined surface.

2. The bearing bush positioning fixture for a low-speed marine diesel engine according to claim 1, characterized in that: The low-speed diesel engine bearing bush positioning fixture for a low-speed diesel engine for a ship further comprises: a bottom locking nut (2), a screw (3) and a top locking nut (6); One end of the screw rod (3) passes through the guide cover plate (4) and is inserted into the positioning seat (1); The bottom locking nut (2) and the top locking nut (6) are respectively locked with the screw (3), so that the low-speed diesel engine bearing shell (5) to be processed is clamped between the positioning seat (1) and the guide cover plate (4).

3. The bearing bush positioning fixture for a low-speed marine diesel engine according to claim 1, characterized in that: At least one bolt hole (12) is provided at the bottom of the positioning seat (1).

4. The bearing bush positioning fixture for a low-speed marine diesel engine according to claim 1, characterized in that: The size of the positioning outer circle (14) of the positioning seat (1) is larger than the size of the inner hole of the low-speed diesel engine bearing bush (5) to be processed.

5. The bearing bush positioning fixture for a low-speed marine diesel engine according to claim 1, characterized in that: A boss (141) is protrudingly provided on the outer surface of the positioning outer circle (14), the first positioning inclined surface (13) is formed by grooving the boss (141), and the outer circle surface of the low-speed diesel engine bearing shell (5) to be processed exceeds the outer wall of the boss (141).

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