Crankshaft angular positioning mechanism capable of automatically centering

Abstract

The utility model discloses a crankshaft angular positioning mechanism capable of automatically centering, which comprises an angular positioning body and a swing claw clamping mechanism, a rack shaft is mounted at the center of the angular positioning body, gear shafts are mounted on two sides of the interior of the positioning body, a piston is mounted at the bottom of the interior of the angular positioning body through a guide sleeve, and the swing claw clamping mechanism is mounted on the piston. An oil cylinder plug is arranged at the bottom of the piston, and a protective cover is installed on the outer wall of the angular positioning body. The swing claw grabbing mechanism comprises a swing claw, and the swing claw is connected with the gear shaft. A swing claw pad is fixedly connected to the swing claw. When oil enters the oil port A, the piston and the rack move downwards, the rack shaft drives the two same gear shafts to synchronously rotate inwards till the two swing claws clamp the connecting rod neck, and angular positioning of the crankshaft is completed. When oil enters the oil port B, the motion directions of the oil port B are opposite, and the swing claw is opened. The automatic centering angular positioning clamp is high in positioning precision and good in flexibility, and the machining precision of the crankshaft is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshaft processing, in particular to an angular positioning mechanism of a crankshaft which can be automatically centered. Background Art

[0002] When machining a crankshaft, the workpiece must be positioned and clamped first. Most of the time, the workpiece needs to be angularly positioned. When machining the crankshaft connecting rod neck, oil hole, and balance iron side, the workpiece needs to be angularly positioned. Due to the complex shape and various specifications of the crankshaft, it is difficult to angularly position the crankshaft. The traditional angular positioning method has poor positioning accuracy, and it is troublesome, time-consuming and labor-intensive to change the crankshaft type. Even crankshafts of the same type and specification will be affected by dimensional tolerances and lead to inaccurate positioning. Utility Model Content

[0003] The purpose of the utility model is to provide a method to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an angular positioning mechanism for a crankshaft that can be automatically centered, comprising an angular positioning body and a swing claw clamping mechanism, wherein a rack shaft is installed at the center of the angular positioning body, gear shafts are installed on both sides of the positioning body, a piston is installed at the bottom of the angular positioning body through a guide sleeve, a cylinder seal is provided at the bottom of the piston, and a protective cover is installed on the outer wall of the angular positioning body. The swing claw grabbing mechanism comprises a swing claw, which is connected to the gear shaft. A swing claw pad is fixedly connected to the swing claw.

[0005] Compared with the prior art, the utility model has the following beneficial effects: when oil enters the oil port A, the piston and the rack move downward, and the rack shaft drives two identical gear shafts to rotate synchronously inward until the two swing claws clamp the connecting rod neck, completing the angular positioning of the crankshaft. When oil enters the oil port B, the movement direction is opposite, and the swing claw opens. This automatic centering angular positioning fixture has high positioning accuracy and good flexibility, and improves the machining accuracy of the crankshaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A schematic diagram of the interior of the utility model;

[0007] Figure 2 It is a cross-sectional view of the utility model.

[0008] In the figure: (1) angular positioning body, (2) rack shaft, (3) gear shaft, (4) piston, (5) guide sleeve, (6) cylinder plug, (7) protective cover, (8) copper sleeve 1, (9) copper sleeve 2, (10) pressure cover, (11) cover plate, (12) swing claw, (13) swing claw pad. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0010] See also Figure 1-2 The utility model provides an angular positioning mechanism that can be automatically aligned and is fixed on the bed of a special lathe for crankshaft processing. The crankshaft to be processed is in a state where both ends of the journal have been centered and axially positioned. When the swing claw of the angular positioning mechanism is closed to clamp a crankshaft connecting rod neck, the crankshaft can be slightly swung around the center of the journal to a centered state under the action of the swing claw. At this time, the connecting rod neck to be processed should be coaxial with the rotation center of the spindle to achieve angular positioning of the crankshaft clamping. After the above-mentioned links are completed, the journals at both ends of the crankshaft are clamped by the clamp, the swing claw of the angular positioning mechanism opens, and the machine tool spindle starts to enter the cutting program. The action of the swing arm of the automatic centering angular positioning mechanism is hydraulically driven. The angular positioning body itself is both a cylinder body and bears the role of the rack shaft guide and the gear shaft support (see attached Figure 1 ), the rack (2) is connected to the piston (4) and reciprocates under hydraulic drive. The double-sided rack (2) is meshed with two symmetrically arranged gear shafts (3) at the same time, driving the swing claw to swing synchronously in the opposite direction to achieve angular positioning of the crankshaft.

[0011] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crankshaft angular positioning mechanism capable of automatic centering, characterized in that: The invention comprises an angular positioning body (1) and a swing claw clamping mechanism, wherein a rack shaft (2) is installed at the center of the angular positioning body (1), gear shafts (3) are installed on both sides of the interior of the positioning body (1), a piston (4) is installed at the bottom of the interior of the angular positioning body (1) through a guide sleeve (5), a cylinder seal (6) is provided at the bottom of the piston (4), and a protective cover (7) is installed on the outer wall of the angular positioning body (1).

2. The crankshaft angular positioning mechanism capable of automatic centering according to claim 1, characterized in that: The swing claw grabbing mechanism comprises a swing claw (12), and the swing claw (12) is connected to the gear shaft (3).

3. The crankshaft angular positioning mechanism capable of automatic centering according to claim 1, characterized in that: A swing claw pad (13) is fixedly connected to the swing claw (12).

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