SU983798A1

SU983798A1 - Pressing device of self-resetting limit switch

Info

Publication number: SU983798A1
Application number: SU813309320A
Authority: SU
Inventors: Виктор Георгиевич Абрамов; Александр Александрович Волков; Сергей Владимирович Осокин; Владимир Сергеевич Ромашов
Original assignee: Предприятие П/Я А-7731
Priority date: 1981-07-03
Filing date: 1981-07-03
Publication date: 1982-12-23

Description

(54) НАЖИМНОЕ УСТРОЙСТВО ДЛЯ КОНЕЧНОГО ВЫКЛЮ ГАТЕЛЯ С САМОВОЗВРАТОМ(54) PUSH DEVICE FOR THE END SWITCH OF THE GATEL WITH SELF RETURN

Изобретение относитс к электро-: технике и может быть использовано дл управлени работой конечных выключателей с самовозвратом, установленных в цеп х управлени , при микроперемещени х рабочего органа механизма со скорост ми от 1 мм/ч и менее .The invention relates to electrical engineering and can be used to control the operation of self-return limit switches installed in control circuits during micro-movements of the mechanism at speeds of 1 mm / h or less.

Известен магнитный выключатель, содержащий корпус, нажимной элемент с демпфирующей пружиной и ,посто нным магнитом, магнитоуправл емый контакт, возвратную пружину.A magnetic switch is known, comprising a housing, a pressure element with a damping spring and, a permanent magnet, a magnetically controlled contact, a return spring.

При нажатии рабочего органа на нажимной.элемент последний приближает посто нный магнит к выводу магнитоуправл емого контакта и под действием магнитного импульса контакты замыкаютс 13.When the actuator is pressed on the pressure element, the latter brings the permanent magnet closer to the output of the magnetically controlled contact and, under the influence of a magnetic pulse, the contacts are closed 13.

Недостатком данного выключател вл етс зависимость скорости . приближени подвижного магнита к выводу магнитоуправл емого контакта, от скорости перемещени упора рабочего Органа механизма на кнопку выключател , вследствии чего возникает вибраци контактов и, как следствие , ненадежное контактирование, особенно при очень медленной скорости изменени управл ющего магнитногоThe disadvantage of this switch is speed dependence. moving magnet to the output of the magnetically controlled contact, from the speed of movement of the stop of the working Body of the mechanism to the switch button, as a result of which the contacts vibrate and, as a result, unreliable contact, especially at a very slow rate of change of the control magnetic

потока. Возникает также нестабильность контактного давлени от величины управл ющего магнит.ного потока и резкое снижение срока службы контактов .flow. The instability of the contact pressure on the magnitude of the control magnetic flux and a sharp decrease in the service life of the contacts also occurs.

Известно также нажимное устройстве дл управлени работой конечного выключател , состо щее из корпуса,в котором размещены контакты источника It is also known to use a pressure device for controlling the operation of a limit switch consisting of a housing in which the source contacts are located.

10 МДС в виде посто нного магнита, предназначенного дл управлени переключателем посредствен магнитного импУльса , катушки возбуждени , на фланце которой приварен фиксирующий эле15 мент в виде тонкой стальной пластины , посто нного магнита, свободно скольз щего в полом сердечнике.10 MDS in the form of a permanent magnet, intended to control a switch of a mediocre magnetic impulse, an excitation coil, on the flange of which a fixing element is welded in the form of a thin steel plate, a permanent magnet, freely sliding in the hollow core.

При взаимодействии одноименных полюсов источника МДС и подвижного In the interaction of like poles of the source of the MDS and the rolling

20 магнита, возникает отталкивание подвижного магнита. При этом он отходит от стальной пластины, входит внутрь полого сердечника и упираетс в основание . Подвижна контактнэ пластин 20 magnet, there is a repulsion of the moving magnet. In doing so, it moves away from the steel plate, enters inside the hollow core and abuts the base. Moving contact plates

25 с закрепленным на ней стальным эпементом прит гиваетс к основанию и замыкает нормальноразомкнутый контакт 23.25 with a steel element fixed to it, is attracted to the base and closes the normally open contact 23.

Недостатком известного нажиМного The disadvantage of the well-known

Claims

30 of the device is that the closure occurs due to the repulsion impulse of the single-pole magnets, which leads to an unstable contact triggering, when the working body with a permanently moving magnet moves very slowly when it comes to the source MDS. The speed of movement of the moving magnet depends on the speed of movement of the source of the GVA. There is a phenomenon of bounce contacts with all the disadvantages arising from this phenomenon. These drawbacks reduce the reliability of the known device during the very slow movements of the working member under the conditions of reciprocating motion and vibrations. The aim of the invention is to increase reliability. This goal is achieved by the fact that the pushing device for a self-return limit switch, comprising a housing, a movable working member rigidly mounted on the housing, in which the movable permanent magnet and its fixing element are located, the MDS source intended to act on the movable permanent magnet, is provided with an emphasis , an additional permanent magnet is used as the fixing element of the permanent magnet, which is rigidly fixed on the movable working member, and the stop is connected to the movable constant magnet, so that it has the ability to act on the limit switch. Source MDS can be made in the form of an electromagnet. Figure 1 shows a schematic of a pressure device for controlling the operation of the final switching off of the bodies; FIG. 2 shows a pressure device at the moment of cracking. The device consists of a locking element in the form of a magnet 1, a movable permanent magnet 2, an emphasis 3, an MDS source in the form of a permanent magnet 4, the housing 5, a limit switch b and a working body 7 of the mechanism on which the housing 5 is rigidly fixed the magnet 4 can be applied to the electromagnet 8. A movable permanent magnet 2 with a stop 3 fixed on it are located in the housing 5, the device operates in the following way. When the working device 7 comes close to the end of the body 5 with the movable magnet 2 and the stop 3 to the magnet 4, interaction forces arise between them and the moving magnet begins to move in the direction of the impactor with a speed opposite to the square of the distance between them. The movable magnet 2, moving from its initial position, with its abutment 3 acts on the push rod of the limit switch b at a speed that ensures operation without chattering. When this happens, the contacts of the limit switch will close. If it is necessary to return the stop to its original position, at the extreme position of the working member, the magnet 4 can be replaced by an electromagnet 8, when the polarity of which is changed, the movable magnet 2 with the abutment 3 returns to its original position and is fixed by the magnet 1. Using the attraction of two magnets of the opposite field rity allowed us to separate the speeds of movement of the movable magnet from the speed of movement of the working body, and to inform the mobile magnet of a speed at which the steady actuation of the end switch is practically at any microdisplacement of the working organ. The design of the proposed pushing device for controlling the operation of the limit switch provides the displacement of the stops with a higher speed, independent of the speed of movement of the working member, when it acts on the pushrod of the limit switch, thus ensuring stable operation of the limit switch with virtually any microdisplacement of the end of the actuator. Claim 1. A clamping device for a self-return limit switch comprising a housing, a movable working member rigidly fixed on the housing in which the movable permanent magnet and its fixing element are located, the source MDS intended to act on the movable permanent magnet, characterized in that , in order to increase reliability, it is equipped with an emphasis, an additional permanent magnet is used as the fixed element of the permanent magnet / which is rigidly fixed on the movable working The auxiliary device is connected to a permanent magnet, so that it can act on the limit switch. 2. Device POP.1, characterized in that the source of the MDS is made in the form of an electromagnet. Sources of information taken into account in the examination 1. German patent 1916438, cl. 21 C 40/01, 1969.

2. The patent of France No. 2386121, cl. H 01 H 36/00, 1978.

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