SU707778A1

SU707778A1 - Apparatus for controlling the oscillation of abrasive belt

Info

Publication number: SU707778A1
Application number: SU772532048A
Authority: SU
Inventors: Моисей Соломонович Наерман; Виктор Владимирович Силушкин; Петр Михайлович Ивочкин; Евгений Иванович Хитров
Original assignee: Московский Автомобильный Завод Им. И.А.Лихачева (Производственное Объединение Зил)
Priority date: 1977-09-30
Filing date: 1977-09-30
Publication date: 1980-01-05

Description

1one

Изобретение относитс к шлифовальным станкам с абразивными лентами.The invention relates to grinding machines with abrasive belts.

Известны устройства дл осцилл ции абразивной ленты, включающие поворотный ролик и датчики, расположенные по бокам ленты. При шлифовании абразивна лента перемещаетс вдоль . оси поворотного ролика от одного датчика к другому посредством изменени угла наклона поворотного ролика исполнительным механизмом по сигналу от датчиков 1. Однако надежность поперечных перемещений ленты в таких устройствах невысока .Devices for oscillation of the abrasive belt are known, including a rotary roller and sensors located on the sides of the belt. When grinding, the abrasive belt moves along. the axis of the swivel roller from one sensor to another by changing the angle of inclination of the swivel roller by the actuator according to the signal from sensors 1. However, the reliability of the transverse movements of the tape in such devices is low.

Наиболее близким по технической сущности к предложенному вл етс ленточно-шлифовальный станок с поворотным роликом, содержащий приводной , нат жной и поворотный ролики, управл ющий золотник с контактным элементом, установленным на боку одной из ветвей ленты. Изменение углов наклона поворотного ролика в этом устройстве достигаетс смещением плунжера золотникового распределител боковой поверхностью абразивной ленты при ее движении вдоль оси наклоненного ролика. Плунжер золотникового распределител реверсируетThe closest in technical essence to the proposed is a belt grinder with a swivel roller, containing drive, tension and swivel rollers, controlling the spool with a contact element mounted on the side of one of the branches of the tape. A change in the angles of inclination of the swivel roller in this device is achieved by displacing the plunger of the spool distributor by the side surface of the abrasive belt as it moves along the axis of the inclined roller. Plunger spool valve reverses

поток рабочей жидкости в полости гидроцилиндра, а шток гидроцилиндра при перемещении воздействует через механизм качани , выполненный в виде системы рычагов, на поворотный ролик и измен ет угол его наклона относительно горизонтальной оси 2.The flow of working fluid in the cavity of the hydraulic cylinder, and the hydraulic cylinder rod, when moving, acts through the swing mechanism, made in the form of a system of levers, on the swivel roller and changes its angle of inclination relative to the horizontal axis 2.

Основным недостатком этого устройства вл етс низка его надеж0 ность в работе при высоких частотах осцилл ционных движений ленты. Кинематическа св зь между импульсом датчика от крайнего бокового положени ленты и наклонами ролика не позво5 л ет увеличить частоту осцилл ции без изменени амплитуды колебаний ленты. При повышении скорости поперечных перемещений ленты вследствие инерционности гидравлической системы The main disadvantage of this device is its low reliability in operation at high frequencies of oscillation movements of the tape. The kinematic connection between the sensor pulse from the extreme lateral position of the belt and the inclinations of the roller does not allow an increase in the oscillation frequency without changing the amplitude of the belt oscillations. When increasing the speed of transverse movements of the tape due to the inertia of the hydraulic system

0 . увеличиваютс перебеги ленты за установленные пределы осцилл ции и возрастает возможность сбега ленты с. роликов.0 the run of the tape increases beyond the set oscillation limits and the possibility of running the tape increases. commercials.

Целью изобретени вл етс повы5 шение надежности осцилл ции абразивной ленты.The aim of the invention is to increase the reliability of oscillation of the abrasive belt.

Это достигаетс тем, что в предложенном устройстве механизм качани поворотного ролика выполнен в видеThis is achieved by the fact that in the proposed device the swing roller mechanism is made in the form of

Claims

0 a cone having a cross-sectional shape of an ellipse installed with the possibility of vrscetsen on the rod of a power cylinder and in contact with one of the shoulders of a double-arm lever inserted into the machine, installed and in contact with a swivel roller. FIG. 1 shows the device, the overall appearance; FIG. 2 is the same. The section A-A in FIG. one; FIG. 3 section bb in fig. 1. In the bores of the housing 1, a power cylinder 2 and a shaft 3 are placed. On the stem 4 of the power cylinder 2 there is rotatably mounted a cone 5 having an ellipse shape in cross section. Cone 5 is coupled to a rotational drive (not shown) through gear b and the drive gear 7 meshed with it. The ring 8 mounted on the stem 4 eliminates the axial movement of the cone 5 and gear b on the stem 4. On the shaft 3 located parallel to the rod 4 of the hydraulic cylinder 2, a double-arm lever 9 is fixed, on which a rotary roller 10 is mounted with the possibility of rotation. The axis of rotation of the rotary roller 10 is located perpendicular to the axis of the shaft 3. One arm of the double-arm lever 9 contacts the outer surface of the cone 5, and the other arm by jato spring 11. Endless abrasive tape 12 is mounted on drive pulley 13, tension roller 14 and swivel roller 10. On one of the branches of endless abrasive tape 12 a contact element is installed, made in the form of a plug 15 connected to plunger 16 of a hydraulic follow spool valve 17. The fork 15 has two sides of inclined protrusions, between which an abrasive belt 12 passes with a gap of the amount of transverse displacements. A hydraulic pump 18, a safety valve 19, a pressure valve 20 and pipelines 21, 22 provide vayut supply pressurized hydraulic fluid to the hydraulic cylinder 2 and the spool valve 17. The abrasive linen 12 that is in contact with the workpiece 23 (e.g. crankpin of the crankshaft). The device works as follows. When the drive gear 7 rotates, the spring-loaded lever 9, which is in contact with the outer surface of the cone 5, oscillates in the vertical plane relative to the axis of the shaft 3. The change in the angles of the rotary roller 10 causes lateral displacement of the abrasive belt 12. In the case of lateral displacement the established oscillation limits of the tape 12 interacts with the inclined protrusion of the plug 15 and moves the plunger 16 of the follow spool valve 17. Depending on the direction displacing the plunger 16 working fluid from the hydraulic pump 18 under pressure through pipelines 21, .22 enters the front or rear cavity of the hydraulic cylinder 2 and moves the rod 4 and the cone 5 in the axial direction, changing the position of the axis of rotation of the rotary roller by means of a spring-loaded lever 9 and shaft 3 10. The endless abrasive belt 12 is moved to the operating position, and the plunger 16 of the follow spool valve 17 returns to the neutral position. Thus, the swing roller swivel mechanism, made in the form of a cone, having an ellipse shape in cross section, performs the main oscillation of the abrasive belt, and the spool device with the TAKTBnvi element and the hydraulic cylinder with axial movements of the cone eliminates the belt displacement beyond acceptable oscillation limits. This makes it possible to increase the reliability of the device:: tva in operation at high frequencies of oscillation of the tape and eliminate runaway from the rollers. Increasing the oscillation frequency of the abrasive belt helps to remove grinding products from the working surface of the belt, increases the removal of metal, i.e. increases grinding performance. For example, increasing the oscillation frequency of an abrasive belt to 50-70 Hz, compared with fluctuations of 5-10 Hz, increases grinding productivity by about three times. Apparatus of the Invention A device for controlling the oscillation of an abrasive belt, comprising drive, tension and swivel rollers, a power cylinder with a rod for oscillation and a swing roller swing mechanism, characterized in that, in order to increase the reliability of oscillation of the abrasive tape, the swing swing mechanism the roller is made in the form of a cone, having in shape a cross section of an ellipse mounted rotatably on the rod of the power cylinder and in contact with one of the arms introduced into the machine two arms set by the condition of interaction with the swivel roller. Sources of information taken into account during the examination 1. USSR author's certificate No. 219156, cl. at 24 V 21/18, 1968.

2. The patent of Germany 1129859, cl. 67 a, 29, 1962 (prototype).