CN220120045U - Floating mechanism for pneumatically measuring outer diameter of crankshaft - Google Patents

Abstract

The utility model relates to a floating mechanism for pneumatically measuring the outer diameter of a crankshaft, which is an important step for ensuring the precision of the crankshaft of an engine, wherein the journals at the two ends of the crankshaft deform after heat treatment, measurement errors can occur, and a measuring part is not easy to control in the horizontal direction and is more difficult to slightly adjust. The utility model comprises a workbench and a base plate, wherein floating isolation plates are arranged at the upper part and the lower part of a connecting block, so that the connecting block is not contacted with the base plate and a pressing plate, and the movement is realized through steel balls; the unbalanced moment in the horizontal plane caused by the dead weight of the crankshaft is utilized, and the moment can enable the connecting block to drive the steel balls to roll in the horizontal plane direction, so that different axial errors are reduced, and the measurement accuracy is improved.

Description

Floating mechanism for pneumatically measuring outer diameter of crankshaft

Technical Field

The utility model belongs to the field of measurement, and particularly relates to a floating mechanism for pneumatically measuring the outer diameter of a crankshaft.

Background

The engine crankshaft is one of the core components of the engine power take off, with the main journal directly linked to the connecting rod, their dimensional fit directly related to the power take off stability. The crankshaft has high machining precision, complex shape and more measured parameters. In the measuring equipment, the universal measuring instrument and the three-coordinate measuring machine cannot meet the requirements of high-beat and mass production. The electric measurement is convenient for data processing, storage and control, so that the crankshaft multi-parameter measurement device commonly adopts electric measurement, but has the defects of complex structure, high cost, high failure rate and the like, and the pneumatic measurement has the advantages of simple structure, low cost, non-contact and the like. However, when the crankshaft is pneumatically measured, particularly when the crankshaft is heat treated, the crankshaft is deformed, which may cause a measurement error. For example, CN2646656Y can realize pneumatic measurement, the crankshaft is deformed under the heat treatment, and the measurement cannot eliminate errors; CN210440835U can measure the shaft diameters of crankshafts with different lengths by adjusting the position of the positioning seat, but the measurement still cannot eliminate the coaxial error, and the measurement part is not easy to control due to the existence of the coaxial error, so that the measurement is more difficult to be adjusted slightly. The present utility model has been made to solve the above-mentioned problems.

Disclosure of Invention

In view of the above, the present utility model is directed to a floating mechanism for pneumatically measuring the outer diameter of a crankshaft, so as to solve the above-mentioned problems.

A floating mechanism for pneumatically measuring the outer diameter of a crankshaft comprises a workbench, wherein a base plate is fixedly connected to the workbench, baffle plates are fixedly connected to the left side and the right side of the base plate, middle blocks are fixedly connected to the front side and the rear side of the base plate, a cover plate is fixedly arranged above the middle blocks, connecting blocks are arranged between the middle blocks on the front side and the rear side, and the connecting blocks are arranged above the base plate;

the connecting block, the workbench and the substrate are fixed through a longitudinal shaft, a separation plate is arranged at the lower part of the connecting block, and the separation plate is not contacted with the connecting block; meanwhile, the isolation plate is arranged on the upper part of the base plate and is not contacted with the base plate, a hole is formed in the isolation plate, steel balls are embedded in one side, close to the baffle plate, of the isolation plate, the steel balls in the isolation plate are in linear arrangement and are not contacted with each other, and the diameter of each steel ball is slightly larger than that of the hole in the isolation plate; the connecting block compresses the steel balls in the isolation plate, and the lower ends of the steel balls in the isolation plate are contacted with the base plate; the part of the connecting block, which is close to the baffle, is provided with a bulge, a separation plate is arranged between the bulge and the baffle, steel balls are embedded in the separation plate, the steel balls in the separation plate are in linear arrangement and are not contacted with each other, and gaps exist among the separation plate, the baffle and the bulge; the cover plate is arranged above the steel balls in the isolation plate and compresses the steel balls in the isolation plate; the isolation plate, the isolation plate and the steel balls can move freely in the horizontal plane.

Gaps exist between the connecting blocks and the baffles at the front side and the rear side;

the connecting block and the isolation plate at the lower part of the connecting block are fixedly penetrated with the workbench and the base plate through a longitudinal shaft;

at least 1 column of steel balls is arranged in the isolation plate; the protrusions on the connecting block are not in contact with the cover plate.

The technical effects are as follows: through the floating isolation plates arranged at the upper part and the lower part of the connecting block, the connecting block is not contacted with the base plate and the pressing plate, when the crankshaft is measured, the axle journals at the two ends of the crankshaft are deformed after heat treatment to enable the measurement to be in a different axial condition, the moment on the horizontal direction enables the crankshaft to be unbalanced in stress, the connecting block can drive the steel balls to roll in the horizontal plane direction under the driving of the moment on the horizontal plane, so that the effect of eliminating unbalanced moment is achieved, the crankshaft can be restored to the coaxial measurement state until the unbalanced moment gradually disappears, and the coaxial error of the crankshaft measurement is further reduced; meanwhile, as the steel ball is adopted, the steel ball is in rolling friction with the upper surface and the lower surface during movement, so that the friction force of movement in a horizontal plane can be greatly reduced, and the movement resistance is smaller; lubricating oil can be arranged in the cavity where the steel ball moves, so that the resistance of horizontal plane movement can be further reduced; the coaxial error is eliminated, the unbalanced moment in the horizontal direction of the crankshaft is utilized, balance is finally realized under the drive of the dead weight of the crankshaft, extra energy consumption is not needed, the setting is simple, the original measuring equipment is not needed to be changed in a large scale, and the coaxial error measuring device has great application value in industry.

Drawings

FIG. 1 is a front view of a floating mechanism of the present utility model;

FIG. 2 is a side elevational view of the floating mechanism of the present utility model;

FIG. 3 is a partial view of a spacer plate of the floating mechanism of the present utility model.

Reference numerals in the drawings: a work table 1; a substrate 2; a baffle 3; a middle block 4; a first separator 5; a second partition plate 6; a cover plate 7; a connecting block 8; a steel ball 9; a protrusion 10.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-3, the utility model provides a floating mechanism for pneumatically measuring the outer diameter of a crankshaft, which comprises a workbench 1, wherein a base plate 2 is fixedly connected to the workbench 1, baffles 3 are fixedly connected to two sides of the base plate, a middle block 4 is fixedly connected to the base plate 2, a cover plate 7 is fixed above the middle block 4, a connecting block 8 is arranged between the middle blocks 4 at the front side and the rear side, and the connecting block 8 is arranged above the base plate 2;

the connecting block 8 is fixedly penetrated with the workbench and the substrate through a longitudinal shaft, the second isolation plate 6 is arranged at the lower part of the connecting block 8, and the second isolation plate 6 is not contacted with the connecting block 8; meanwhile, the second isolation plate 6 is arranged at the upper part of the base plate 2 and is not contacted with the base plate 2, steel balls 9 are embedded in one side, close to the baffle plate 3, of the second isolation plate 6, the steel balls 9 in the second isolation plate 6 are linearly arranged and are not contacted with each other, the steel balls 9 in the second isolation plate 6 are tightly pressed by the connecting blocks 8, lubricating oil can be arranged between the lower ends of the steel balls 9 in the second isolation plate 6 and the base plate 2 and between the connecting blocks 8 and the base plate, and the resistance of the movement of the steel balls is reduced; the part of the connecting block 8, which is close to the baffle plate 3, is provided with a bulge 10, a first isolation plate 5 is arranged between the bulge 10 and the baffle plate 3, steel balls 9 are embedded in the first isolation plate 5, the steel balls 9 in the first isolation plate 5 are in linear arrangement and are not contacted with each other, and gaps exist between the first isolation plate 5 and the baffle plate 3 and between the first isolation plate 5 and the bulge 10; the cover plate 7 is arranged above the steel balls 9 in the first isolation plate 5 and compresses the steel balls 9 in the first isolation plate 5; the first and second spacers 5, 6 and the steel balls 9 are movable in a horizontal plane.

The connecting block 8 has gaps with the front and rear baffles 3; the connecting block 8, the workbench 1 and the base plate 2 are fixed through a longitudinal axis; the protrusions 10 on the connection block 8 do not contact the cover plate 7.

Working principle: when the crankshaft is placed in the measuring part, when the crankshaft is different, the moment of the crankshaft in the horizontal direction can freely move on the horizontal plane through the steel balls on the isolating plate under the action of the connecting block, and when the steel balls and the isolating plate are not freely moved on the horizontal plane, the crankshaft can reach the coaxial state on the horizontal plane, so that the error of different axes is reduced, and the measuring precision and accuracy are improved.

Although the present utility model has been described with reference to the foregoing embodiments, it should be understood that modifications, equivalents, improvements and modifications of the technical solution described in the foregoing embodiments may occur to those skilled in the art, and all modifications, equivalents, and alternatives falling within the spirit and principles of the present utility model are intended to be included within the scope of the present utility model.

Claims (3)

1. A floating mechanism for crank external diameter pneumatic measurement, includes workstation and base plate, its characterized in that: a floating mechanism for pneumatically measuring the outer diameter of a crankshaft comprises a workbench (1), wherein a base plate (2) is fixedly connected to the workbench (1), baffle plates (3) are fixedly connected to the left side and the right side of the base plate (2), middle blocks (4) are fixedly connected to the front side and the rear side of the base plate (2), a cover plate (7) is fixedly arranged above the middle blocks (4), a connecting block (8) is arranged in the middle of the middle blocks (4) on the front side and the rear side, and the connecting block (8) is arranged above the base plate (2);

the connecting block (8) is fixedly penetrated with the workbench and the base plate through the longitudinal shaft, a second isolation plate (6) is arranged at the lower part of the connecting block (8), and the second isolation plate (6) is not contacted with the connecting block (8); meanwhile, the second isolation plate (6) is arranged on the upper portion of the base plate (2) and is not in contact with the base plate (2), steel balls (9) are embedded in one side, close to the baffle plate (3), of the second isolation plate (6), the steel balls (9) in the second isolation plate (6) are in linear arrangement and are not in contact with each other, the connecting block (8) tightly presses the steel balls (9) in the second isolation plate (6), and the lower end of the steel balls (9) in the second isolation plate (6) are in contact with the base plate (2); the part of the connecting block (8) close to the baffle plate (3) is provided with a bulge (10), a first isolation plate (5) is arranged between the bulge (10) and the baffle plate (3), steel balls (9) are embedded in the first isolation plate (5), the steel balls (9) in the first isolation plate (5) are in linear arrangement and are not contacted with each other, and gaps exist among the first isolation plate (5), the baffle plate (3) and the bulge (10); the cover plate (7) is arranged above the steel balls (9) in the first isolation plate (5) and compresses the steel balls (9) in the first isolation plate (5); the first isolation plate (5), the second isolation plate (6) and the steel balls (9) can move freely in the horizontal plane.

2. A floating mechanism for pneumatic measurement of outer diameter of crankshaft according to claim 1, wherein the connecting block (8) and the baffle (3) on front and rear sides are provided with gaps, and the connecting block (8), the first isolation plate (5) on the lower part of the connecting block (8), the workbench (1) and the base plate (2) are fixed by threaded shaft penetration.

3. A floating mechanism for pneumatic measurement of outer diameter of crankshafts as claimed in claim 1, characterized in that the projections (10) on the connecting block (8) are not in contact with the cover plate (7), the second separator plate (6) has at least 2 columns of steel balls, and the first separator plate (5) has at least 1 column of steel balls.