RU2510332C2 - Electrical press - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming equipment, particularly, to presses with electromagnetic transfer of pressure to plunger or plate. Electric press comprises bed, stator with excitation winding, slide, rod and reverse stroke system. Stator consists of transverse rod carrying excitation winding and two lengthwise round-section rods. Armature winding is arranged on lengthwise rods. Slider is composed by two parts embracing lengthwise rods and interconnected by crossbar. Said parts feature external envelope with its coordinate in polar system of coordinates satisfies the enclosed relationship. Stator can comprise two guide rods from nonmagnetic material. Slider is equipped with guide bushes embracing guide rods. Bearing plate is made of nonmagnetic material.

EFFECT: decreased magnetic resistance of magnetic circuit, higher pull.

5 cl, 2 dwg

Description

FIELD OF THE INVENTION

The invention relates to the section of various technological processes, namely to pressing with pressure transmission to a plunger or plate by electromagnetic means.

The level of technology.

Closest to the invention in technical essence is an electric press containing a bed, a stator with a field winding, a slider, a rod and a reverse system (RU 2026792 C1, B30B 1/42, 01/20/1995) / 1 /.

In the known press, the air gap in the magnetic circuit is equal to twice the stroke. This leads to a large magnetic resistance and leads to a limitation of traction and the need to increase magnetomotive force, and consequently, an increase in the number of turns of the field winding and the overspending of the winding wire. In addition, different windings are used for forward and reverse operation, which leads to inefficient use of the winding and additional over-expenditure of the winding wire. Not all sections of the slider have a cross section whose area is equal to the ratio of the calculated value of the magnetic flux in this section to the calculated value of magnetic induction, which leads to either oversaturation of the sections, or to excessive consumption of ferromagnetic material and weighting of the press.

Disclosure of invention

The problem to which the invention is directed, is to increase the efficiency of using ferromagnetic material, windings and reducing the consumption of winding wire.

The technical result consists in reducing the magnetic resistance of the magnetic circuit, using the same winding for direct and reverse travel, increasing traction and reducing the number of turns of the winding, as well as uniform magnetic saturation of all sections of the slider.

The technical result is provided by the following set of features. An electric press containing a bed, a stator with a field winding, a slider, a rod and a reverse system, the stator consists of a transverse rod on which the field winding is placed, and two longitudinal rods of circular cross section on which the armature winding is placed, and the slider is made in in the form of two covering longitudinal rods and connected by a jumper parts made with an external envelope, the coordinate ρ of which in the polar coordinate system satisfies the relation

ρ = R + δ + lφ / 2 · 180,

Where

R is the radius of the longitudinal rod;

δ is the value of the working air gap;

l is the width of the jumper;

φ is the angle of the arc of the inner circle of the covering part of the slider in the appropriate place, deg.

In addition, in particular cases, the stator contains two guide rods, the guide rods are made of non-magnetic material, the slider is equipped with guide sleeves covering the guide rods, and the bed is made with a base plate of non-magnetic material.

The problem to which the invention is directed, and the technical result are interconnected as follows.

Reducing the magnetic resistance of the magnetic circuit, using the same winding for direct and reverse travel, increasing traction and reducing the number of turns of the winding, as well as uniform magnetic saturation of all sections of the slider, increase the efficiency of use of ferromagnetic material, windings and reduce the consumption of winding wire.

Brief Description of the Drawings

In Fig.1 shows an electric press, in Fig.2 - half of the slider.

The implementation of the invention

The invention can be implemented as follows.

For an electric press containing a bed, a stator with an excitation winding, a slider, a rod and a reverse system, the stator consists of a transverse rod on which the excitation winding is placed, and two longitudinal rods of circular cross section, on which the anchor winding is placed, and the slider is made in the form two covering longitudinal rods and connected by a jumper of parts made with an external envelope, the coordinate ρ of which in the polar coordinate system satisfies the relation

ρ = R + δ + lφ / 2 · 180 (see drawings).

Thus, the purpose of the invention — its use as an electric press — is realized.

Information confirming the possibility of obtaining a technical result during the implementation of the invention (a causal relationship of the essential features with the specified technical result) is as follows.

The stator is made up of a transverse rod, on which the field winding is placed, and two longitudinal rods of circular cross section, on which the anchor winding is placed, a slider in the form of two spanning longitudinal rods and connected by a jumper parts made with an external envelope whose coordinate ρ is in the polar coordinate system satisfies the relation ρ = R + δ + lφ / 2 · 180, leads to a decrease in the magnetic resistance of the coil, an increase in traction and a decrease in the number of turns of the winding, as well as a uniform magnetic scheniyu all slide areas.

Therefore, the set of essential features is sufficient to achieve the technical result provided by the invention.

Description of device design

In an electric press containing a bed 1, a stator with a field winding 2, a slider 3, a rod 4 and a reverse system, the stator consists of a transverse rod 5, on which the field winding 2 is placed, and two longitudinal rods 6 of circular cross section, on which the anchor the winding, and the slider 3 is made in the form of two parts 7, covering the longitudinal rods 6 and connected by a jumper 8. Parts 7 are made with an external envelope, the coordinate ρ of which in the polar coordinate system satisfies the relation ρ = R + δ + lφ / 2 · 180. The stator contains two rod guides. Guide rods are made of non-magnetic material. The slider 3 is provided with guide bushings 9 covering the guide rods. The bed 1 is made with a base plate 10 of non-magnetic material.

Press works as follows. The field winding 2 creates a magnetic flux that is localized in the transverse rod 5, the first longitudinal rod 6, the slider 3 and the second longitudinal rod. The magnetic flux in the working air gaps interacts with the current of the armature winding, as a result of which, in accordance with Ampere’s law, traction is generated. The magnetic flux in the working gaps is evenly distributed along the circumference of the longitudinal rods, therefore, all sections of the anchor winding located under the poles of the slide are used to create traction.

Thus, the proposed electric press, unlike the prototype, increases the efficiency of using ferromagnetic material, windings and reduces the consumption of winding wires.

The effectiveness of the proposed electric press is due to its improved design.

Claims (5)

1. An electric press comprising a bed, a stator with an excitation winding, a slider, a rod and a reverse system, characterized in that the stator consists of a transverse rod on which the excitation winding is placed, and two longitudinal rods of circular cross section on which the anchor winding is placed, and the slider is made in the form of two covering longitudinal rods and connected by a jumper parts made with an external envelope, the coordinate ρ of which in the polar coordinate system satisfies the relation
ρ = R + δ + lφ / 2 · 180,
Where
R is the radius of the longitudinal rod;
δ is the value of the working air gap;
l is the width of the jumper;
φ is the angle of the arc of the inner circle of the covering part of the slider in the appropriate place, deg. 2. The press according to claim 1, characterized in that the stator contains two rod guides. 3. Press according to claim 1 or 2, characterized in that the guide rods are made of non-magnetic material. 4. The press according to claim 1, characterized in that the slider is equipped with guide bushings covering the guide rods. 5. The press according to claim 1, characterized in that the bed is made with a base plate of non-magnetic material.

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