SU1530834A1 - Electric drive of hand-operated tool - Google Patents

Abstract

The invention relates to electrical engineering and, in particular, to electric drives of a hand tool, such as electric cutters, electric saws, electric files, electric shears, and the like. The purpose of the invention is to expand the functionality of the electric drive, reduce energy intensity and increase electrical safety. The electric drive contains a translational motor consisting of a fixed inductor and a mobile core. The inductor contains a magnetic core 1, in the groove of which a winding 2 is placed. Slide bearings 4, 5 are attached to the inductor case, which guide the movement of the core containing the magnetic core 6 and two short-circuited windings 7, 8. A bevel is mounted on the front part of the core, on which the roller is supported 10 of a mechanical transmission link comprising two levers 11, 12 connected by a spring 14. The free end of the lever 12 is connected to one end of the cable 16, the other end of which is connected to a plunger 24 moving in the housing 23 of the tool holder. The force from the engine is transmitted to the working tool through a lever transmission and a cable, which makes it possible to more fully utilize the capabilities of the engine, reduce the size and weight of the part of the tool that is directly in the working hand, and expand the range of application of the electric drive. 2 Il.

Description

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electric drive, reducing power consumption and improving electrical safety, 3neKtponpHBOA contains a translational motor consisting of a fixed inductor and a moving core. The inductor contains a magnetic core 1, in the groove of which a winding 2 is placed. Slide bearings 4, 5 are attached to the inductor case, guiding movements of the core containing magnetic core 6 and two short-circuited windings 7.8 "On the front part of the core there is a bevel on which the roller is supported 10 mechanical transmission link.

containing two levers P., 12 connected by a spring 14. The free end of the lever 12 is connected to one end of the cable 16, the other end of which is connected to the plunger 24 moving in the housing 23 of the tool holder. The force from the engine is transmitted to the working tool through a lever transmission and a cable, which makes it possible to more fully utilize the capabilities of the engine, reduce the size and weight of the part of the tool that is directly in the working hand, and expand the range of application of the electric drive. 2 yl

The invention relates to electrical engineering, in particular to electric drives of a hand tool, such as, for example, electric cutters, electric saws, electric saws, electric shears, and others, and can be used in various sectors of the national economy.

The aim of the invention is to extend the functionality of reducing power consumption and improving the electrical safety of the drive.

Figure 1 shows the principal design of the electric drive of a hand tool; Figure 2 shows the dependence of the magnitude of the displacement of the core on the forces acting on it.

The electric drive of the hand tool comprises a translational motor consisting of a stationary inductor and a movable core. The stationary inductor consists of a magnetic wire 1 in whose slot a winding 2 of excitation is placed. The bearings 4 and 5 of the slide (the latter has a window on the lateral surface) are attached to the inductor casing 3, which direct the movement of the motor core containing the magnetic core 6 and the short-circuited windings placed in the grooves 7 and the brake 8 are made of a material with high electrical conductivity. The position of the measles is located so that the accelerating short-closed winding 7 is located closer to the transverse axis a-a than the braking one. In the initial position, measles is held by the return

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springs 9. A bevel is made on the front part of the magnetism of the core, on which roller 10 of the mechanical transmission link rests. The link contains two levers, the first lever 11 being made in the form of a V-shaped plate enclosing the second lever 12. Each of the levers is attached to the body 3 at one end inductor by means of a hinge ring 13. In the initial position, the lever 12 rests on the lever 11 and is held in this position under the action of a preloaded spring 14, one end of which is supported (on the lever 11, and the second on the lever 12. Thus the levers are mechanically connected to each other via a spring 14o. The free end of the lever 11 rests on the roller 10. The free end of the lever 12 through the insulating sleeve 15 is connected to the end of the cable 16, the end of the braid 17 of which is fixed on the body 19 of the engine B The motor housing 19 is rigidly fixed to the motor through insulating gaskets 20 and 21. The opposite end of the braid 17 is rigidly connected to the plug 22 of the tool holder body 23. The second end of the cable 16 is rigidly fixed in the plunger 24, to which the movable part of the working tool can be fastened by means of a thread. In the initial position, the plunger 24 is held by the spring 25.

Various tools (nozzles) can be attached to the actuator, for example, side cutters (fig. 1). The fixed part of side cutters 26 are

Pits to the body 23 of the tool holder with the help of a cap nut 28, and the movable part of the side cutters 27 to the plunger 24,

The drive works as follows.

When a current pulse is applied to the excitation winding 2, the magnetic flux created by the current, the passage through the magnetic conductor 1 of the inductor and the magnetic conductor 6 cor, induces an emf in the short-circuited winding 7. According to Lenz's law

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The flux linkage of the core and inductor winding creates a current in the short-circuited winding 7, the direction of which is opposite to the direction of the current in the winding 2 of the inductor. An electromagnetic force appears between the circuits with a current having the opposite direction, accelerating to the measles (FIG. 1 to the left side), which is added to the force arising from the interaction of the winding 2 and the magnetic circuit 6 of the core. The anchor begins to move. At the same time, if the magnitude of the opposing force (load) at all values of the movement of the cortex X (Fig 2, curve) is less than the electromagnetic force (Fig 2, curve 11), and less than the preload force of the spring 14, then the elastic elements of the mechanical the transmissions work as hard (t, e, not constricted) and the plunger 24 begins to move at the moment of touching the core, t, e, the drive performs useful work during the entire movement of the core. If the initial opposing force is greater than the initial electromagnetic force (FIG. 2, curve III) or the force of preloading the spring 14, then at the beginning of the core stroke the movement of the core is transmitted through roller 10 and lever II to spring 14, which is compressed until its force is compressed does not reach the value of the opposing force (load) (, point X), the further movement of the core is converted into movement by the plunger 24 (and, accordingly, the moving parts of the working tool), i.e. the drive begins to perform useful work from

When the plunger suddenly stops due to a sharp increase in the opposing load force (fig2,

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curve IV) measles continues to move, and its increasing force compresses the spring 14, which helps prevent the cable from breaking,

In case of insufficient load, when the measles has a residual kinetic energy after moving by the amount of 11 Hz of the working gap, it continues to move in the same direction, but the rotation of levers II and 12 stops as the roller moves from the bevel of the core to its cylindrical surface. The residual kinetic energy of the core is quenched due to the presence of a short-circuited winding 8, which upon further movement of the core enters the zone of action of the magnetic flux of the inductor, an EMF is induced in it and a braking force appears, damping the speed of movement of the core

The movement of the core to the initial position is provided by the action of the return spring 9.

Thus, the drive design allows to significantly expand the range of loads that can be operated by the actuator, made on the basis of the electromagnetic translational motor, and consequently, the range of the working tool connected to the same actuator, t, e, the actuator can serve as a drive universal hand tools.

In addition, the design of the drive will significantly reduce labor costs when working with hand tools due to a significant reduction in weight and dimensions of that part of the hand tool that is directly in the hands of the worker.

Claims (1)

Invention Formula Electric drive of the hand tool, contents of the translational motor, including a stationary inductor and movable measles located in the motor housing, mechanical transmission and working tool holder consisting of the housing with its spring-loaded plunger mechanically connected to the engine core, while the tool holder is mechanically connected to the engine casing, distinguishing with the fact that, in order to extending the functionality, reducing energy consumption and improving electrical safety, a bevel is made on the front part of the core, the mechanical transmission is made in the form of two hinges connected and spring-loaded relative to each other levers fixed at one end on the inductor, and the free foot of one lever rests through the roller ABOUT X; HK Phie.g on the bevel of the core, the mechanical connection between the holder and the engine body is made in the form of a cable, one end of which is connected to the free end of the second lever, and the other is fixed in the plunger, the cable braid is fixed at one end through the insulating sleeve to the engine body, and the other end - to the body of the holder.