SU880683A1 - Machine tool for press-fitting bearings onto a shaft - Google Patents

Description

(54) MACHINE FOR NLPRESSING BEARINGS

one

The invention relates to mechanical engineering, in particular, to machines for assembly by pressing, and can be applied in all areas of the national economy, where parts such as shaft-bushing are assembled.

A known machine for pressing bearings onto a shaft, comprising a shaft support mounted on a frame, as well as located power cylinders symmetrically with respect to the support along the axis of the assembly, connected to their support plan shafts; with centering bearing housings. The guide racks for placing the faceplate and mounted on the faceplates of electromagnetic exciters of mechanical oscillations, the windings of which are connected through rectifying valves with an alternating current source, are made in the form of parallel rods located on both sides of each electromagnetic exciter of mechanical oscillations and fixed on the uprights, and faceplates mounted on the rods G1.

The main disadvantage of the machine is low efficiency: due to the presence of frictional force in the guide rods, which are moved in the process

press-on electromagnetic exciters of mechanical vibrations, in addition, it occupies a significant production area and has a complex structure.

The purpose of the invention is to increase the efficiency of the machine;

This goal is achieved by the fact that the machine for pressing the sub 10 hips onto the shaft containing the power cylinder mounted on the frame, the electromagnetic exciter of mechanical vibrations, the winding of which is connected to the AC source, while supporting with centering sockets coaxially aligned and connected an electromagnetic exciter, .when one of the supports is connected to the rod of the power cylinder, a load is mounted on the rod of the power cylinder in front of the support connected to it The ent on which the support is fixed is connected with the eye of the cylinder, while the latter is located above the electromagnetic exciter and cooci Q him.

Claims (2)

In order to adjust the frequency of mechanical oscillations, the rates are supplied with a power thyristor and a control device, while the excitation winding of the electromagnetic exciter of mechanical oscillations is connected through the thyristor to the terminals of an AC network to which the inputs of the control device are connected, and the outputs of the latter thyristor. Figure 1 shows the machine, a general view; Fig. 2 illustrates a circuit diagram for switching on the excitation winding of the electromagnetic exciter of mechanical oscillations. The machine for pressing the bearings onto the shaft contains an electromagnetic exciter 2 mechanical oscillations with core 3 mounted on frame 1, elastic elements 4 in the form of springs, which are fastened to stand 1 by means of racks 5. The anchor 7 of the electromagnetic exciter is a mechanical vibration oscillator attached to the elastic elements 4 by means of bolts on the housing 8 below. A support 9 is mounted on the upper part of the case 8 with a centering nest 10 under the press-fit bearing 11. A power cylinder 12 is mounted on the stern electromagnetic connected to the load element 13, on which another support 9 with centering is attached. a nest 14 for another press-fit bearing 11. When installed on the studs in the slots 10 and 14, the supports 9 for the studs are located along the axis of the assembled rotor shaft 15. The excitation winding b of the mechanical vibration exciter 2 is connected to the terminals of the alternating current network 16 through the power thyristor 17, which is controlled from the control device 18, the device inputs being connected to the terminals of the alternating current network 16, and the electrodes of the power thyristor 17. The machine for pressing the bearing onto the shaft works as follows. Before the start of operation, the cargo element 13 with the support 9 and the seat 14 under the press-fit bearing 11 is in the maximum up position by means of the power cylinder 12. In the lower slot 10 of the support 9, another rotated bearing 11 is mounted with a rotor with a shaft 15 with a preload. 14 rolling bearings, fitted on both ends of the shaft. Then, including the power cylinder 12, the cargo element 13 with the support 9 is lowered onto the upper bearing 11. After this, the electromagnetic exciter 2 is mechanically oscillated and simultaneously the rolling bearings 11 are pressed on both ends of the rotor shaft 15. After pressing the bearings 11, the electromagnetic exciter 2 of the mechanical oscillations is turned off, and the cargo element 13 with the support 9 is retracted by means of the power cylinder 12. For adjusting the amplitude and frequency of mechanical vibrations at different tension of the connection, a control device 18 is provided which controls the opening angle of the power thyristor. Due to the fact that the machine contains one mechanical vibration exciter, one power cylinder with additional load, a power thyristor and a control device, the machine design is simplified, the production area decreases, the amplitude and frequency of mechanical vibrations are adjusted, technological intensities are greatly intensified the process, the time for the technological process is reduced dramatically and, accordingly, the total energy 3 times. Claim 1. Machines for pressing bearings onto a shaft containing a power cylinder mounted on a frame, an electromagnetic mechanical vibration exciter, the winding of which is connected to an alternating current source, while bearing with centering sockets for pressed bearings that are coaxially aligned and connected to an electromagnetic exciter, wherein one of the supports is connected to the rod of the power cylinder, characterized in that, —WE, in order to increase the efficiency of the machine, on the rod of the power cylinder, before the support, connected with him, set freight element, which is fixed support, the connection with the rod of the cylinder, the latter is located above the electromagnetic exciter and coaxially with it. 2. The machine according to claim 1, characterized in that, in order to adjust the frequency of mechanical oscillations, it is equipped with a power thyristor and a control device, while the excitation winding of the electromagnetic exciter of mechanical oscillations is connected through the thyristor to the AC mains, the inputs of the control device are connected, and the outputs of the latter are connected to the control electrodes of the power thyristor. Sources of information taken into account during the examination 1. USSR author's certificate No. 707757, cl. In 23 R 19/02, 1977. FIG. 2