BG709Y1 - Device for repairs of bearing journals of large-sized shafts and axles without their disassembly - Google Patents

Abstract

The device can find application in repair works in opencast coal mining of the mining industry, as well as in the briquette factories for the repair of the shafts of the drying drums. Placing of the device to the front of the shaft/axle is made in such a way so that the sole journal for treatment remains free. There is a possibility for attaining alignment between the device and the shaft/axle journal, as well as stepless adjustment of the revolutions of the opening cylinder, carrying the knife blade with the cutting tool by means of the pneumatic motor which has fair characteristics. The manual feeding of the cutting tool by means of a nut-threading mechanism ensures its uneven feeding, depending on the deformations of the machined surface, by means of which optimum mode of cutting is effected. There is no need for oil lubrication and no sealing is required. The device comprises a housing in the form of a hollow cylindrical body (4), fitted on a shaft (1) subject to machining, on which body (4) an operating cylinder (3) is mounted, supporting a knife head (13) with a cutting tool, driven in rotative and translational motion, the translational revolving of which is effected by themean of nut threading mechanism (11 and 12). The operating cylinder (3) is mounted coaxially over body (4) by means of bearings (7), resting on shafts (8) mounted between bushings (9 and 10) in bearing bodies (2) fitted symmetrically at 120 degree over the cylindrical surface of the operating cylinder (3). The connection between the hollow cylindrical body (4) and shaft (1) is made by bolts (5), and for the rotative driving of cylinder (3) a pneumatic motor (6) is envisaged.

Description

Technical field

The utility model relates to a device for repairing camshafts of large shafts and axles without dismantling them, which can be used in the repair work of the opencast mining of the mining industry, as well as in briquette factories for the repair of the axis of the drying drums.

BACKGROUND OF THE INVENTION

The removal and repair of shafts and axles of long length and diameter are associated with some difficulties, so it is preferable to have them repaired on site without dismantling.

A device for cutting the necks of large shafts is known, including a housing comprising a hollow cylindrical body, on the inner surface of which base elements are formed, and a knife head mounted on a working cylinder enclosing a coaxially hollow cylindrical body and its bearing. Through the working cylinder, the knife head is connected to a drive mechanism for rotational motion and to a nut of a screw-nut mechanism for carrying out a linear translational movement, the screw of which is fixedly connected to the cylinder, and its nut to a second drive /.

The base of the known device is performed on existing working necks of the upcoming shaft, which do not require machining. This does not allow the device to be aligned with the shaft / axis. In addition, the speed of the working cylinder and the feed of the cutting tool are unregulated and do not allow the choice of the optimum cutting mode, and the lubrication of the worm gearboxes is carried out by means of an oil bath requiring good compaction.

The technical nature of the utility model

The task of the utility model is to provide a device for repairing the camshafts of large shafts and axles of unlimited length and up to 600 mm in diameter, allowing a single shaft of the shaft to be based beyond alignment and adjusting and alignment between the device and the neck. on the shaft / axle, as well as adjusting the rotary and gradual movement of the blade head with the cutting tool.

The task has been solved by creating a device for repairing large-sized shafts and axles without dismantling them, including a housing comprising a hollow cylindrical body based on the shaft to be machined, on which a working cylinder is mounted, with a rotary driven and progressive blade. with a cutting tool, the progressive actuation of which is carried out by a screw-nut mechanism. According to a useful model, the working cylinder is coaxially mounted on the hollow cylindrical body by means of bearings mounted on axles mounted between a sleeve in the bearing bodies and arranged symmetrically 120 ° on the cylindrical surface of the working cylinder. The connection between the hollow cylindrical body and the shaft to be machined is made by bolts, and a pneumatic motor is provided for the rotary drive of the working cylinder.

The benefits of the utility model are the following.

The arrangement of the device to the shaft / axle head is made so that the only neck to be machined remains free. Aligns the device with the shaft / shaft neck.

Stepless adjustment of the speed of the working cylinder bearing the cutter head with the cutting tool is achieved by means of a pneumatic motor having good characteristic.

The manual feed of the cutting tool by means of a screw-nut mechanism ensures its uneven feed depending on the deformations of the machined surface. This allows for optimum cutting mode.

There is no need for oil lubrication and no compaction is required.

Explanation of the annexed figures

An exemplary embodiment of the device is shown in the accompanying figures, of which:

Figure 1 is a cross-sectional view of an equipment whose shaft / axis is to be machined with two devices mounted;

FIG. 2 is a cross-sectional view of the end of the shaft (node E of FIG. 1) together with the device mounted thereto; FIG.

Figure 3 is a cross-sectional view of the device transversely to its axis in the plane AB of Figure 2;

FIG. 4 is a sectional view of the device according to FIG.

An example of a utility model

The device consists of a housing comprising a hollow cylindrical body 4 based on the shaft 1 to be machined, coaxially mounted on a working cylinder 3 by means of bearings 7 mounted on axles 8 mounted between bushes 9 and 10 in bearing bodies 2 arranged symmetrically 120 ° on the cylindrical surface of the cylinder 3. A knife head 13 is attached to the working cylinder 3 with a cutting tool, rotatably and gradually driven. The progressive actuation is accomplished by a screw-nut mechanism 11 and 12. The connection between the hollow cylindrical body 4 and the shaft 1 to be machined is made by bolts 5. A pneumatic motor 6 is provided for the rotary actuation of the working cylinder 3.

Using the utility model

The shaft 1, which is to be repaired, is released from the elements mounted on it, the damaged neck is welded and the hollow cylindrical body 4 is mounted at the end of the shaft 1. The working cylinder 3 is mounted on the hollow cylindrical body 4 together with the bearing bodies 2 and the parts: bearings 7, axles 8 and bushings 9 and 10, which achieve alignment and minimum clearance between the two cylinders 4 and 3. By means of the bolted connection 5 of the cylindrical body 4 to the end of the shaft 1, by manually rotating and feeding the working cylinder 3 with measuring meter mounted on it e is achieved alignment between the device and the neck of the shaft 1. Mounted successively screw 11 of the wrench-screw mechanism, the pneumatic motor 6, the nut 12 and the cutting head 13 with the cutting tool.

Receiving rotary and adjustable movement from the pneumatic motor 6 and gradually, manually, by means of the screw-nut mechanism 11 and 12, the knife head 13 with the cutting tool carried by the working cylinder 3 bypasses the neck of the shaft 1 in the deformed surface intended to be recovered until reaching the prescribed dimensions. The device is dismantled in reverse order.

Claims (1)

Claims 1. A device for repairing large-sized shafts and axles without dismantling them, including a housing comprising a hollow cylindrical body based on the shaft to be machined, on which a working cylinder is mounted, having a rotatable actuator and a progressive blade head with a cutting tool, actuation of which is carried out by means of a screw-nut mechanism, characterized in that the working cylinder (3) is coaxially mounted on the hollow cylindrical body (4) by means of bearings (7) mounted on axles (8) mounted between lugs (9 and 10) in bearing bodies (2) arranged symmetrically 120 ° on the cylindrical surface of the working cylinder (3), and the connection between the hollow cylindrical body (4) and the shaft to be machined (1) is made by bolts ( 5), a pneumatic motor (6) is provided for the rotary drive of the working cylinder (3). Attachment: 4 figures Literature 1. BG 44922.