SU1183253A1 - Apparatus for feeding sheet into working zone - Google Patents

Description

The invention relates to the field of cold metal forming and can be used to feed the sheet to the processing machine.

The purpose of the invention is to improve the reliability and accuracy of the feed.

FIG. 1 shows a sheet feeding device; in fig. 2 - the same, top view.

The device comprises a feeding carriage 1 with grippers 2, which feeds the sheet into the scissors at a predetermined step by an electric drive with a thyristor converter (a variable-speed DC motor).

The engine-carriage system includes chain 3, the ends of which are connected to the two sides of the carriage 1. The chain is the traction body of the carriage movement mechanism. The chain tensioning device, which is a pneumatic cylinder 4, connected to the tensioning sprocket 5 via a fork 6 and providing a constant tension of the chain during operation. Gearbox 7, necessary to increase the torque of the drive. Brake carriage device, which is an electromagnetic brake 8, mounted on the drive shaft 9 of the chain transmission.

The accuracy of the positioning of the carriage 1 is achieved by preventing the engine-carriage backlash from opening by means of an electromagnetic brake, which is activated simultaneously with the transition of the electric motor to the braking mode. The unit for measuring the movement of the carriage 1 from the measuring roller 10, on the axis of which is mounted a selsyn sensor 11, which is rotated through a step-up gearbox 12 by a flexible cable 13 fixed on both sides of the carriage 1. The measuring roller 10 must rotate without slippage that ensures

is controlled by the constant tension of the rope by the spring 14 and the greatest girth of the measuring roller by the rope with the help of blocks 15. The measuring roller 10 has

₅ diameter ring groove with the profile of the rope. The size of the diameter of the measuring roller 10 is selected on the basis of the required resolution of the step of feeding the carriage 1.

, _ Νί

YU '

where ά _ρ is the diameter of the measuring roller along the axis of the rope;

N — step from the series of the digital indication system (metering detector 15 ');

ί — The gear ratio of the gearbox is necessary to increase the rotational speed of the selsyn sensor;

Pm — the desired sampling resolution of the feed pitch.

For example, T> η = 0.1 mm. N = 20 and ί =

= 2.5, then άρ = 159.15 mm.

A steel cable with a diameter of about 3 mm can be selected as a flexible rope.

The device works as follows. 25 The electric chain drive moves the carriage 1 fixed to it by a rope 13, rotates the rotor of the selsyn-sensor 11 mounted on the axis of the measuring roller 10. Selsin-sensor 11 sends signals about the movement of the carriage into the device 16

30 (system) digital display (DRO). DRO controls the operation of the thyristor converter 17 outputs signals to increase or decrease the speed or changing the direction of motion and stop the motor 18 connected to Tiris ³⁵ Thorn transducer. At the same time, the DRO conversion unit provides information

1183253

four

on the amount of movement to the display panel. In this way, the carriage distance traversed is measured. As a converter of a digital display device, a DRO of type F 5134C can be used, and a sensor-selsyn type BS — 155A. In the zone of the initial position of the carriage 1 are placed the sensors of the braking 19 and absolute zero 20 (the initial position). From the absolute zero sensor 20 at a distance of 1000 mm are located the braking sensors 21, monitoring the accuracy of working out size 22 (feedback sensor monitoring - 4DOS). This sensor 22 is required to enter the operational correction in the control system with inaccurate manufacturing

or wear on the measuring roller. The correction value is determined by moving the carriage 1 for 1000 mm from the absolute zero sensor in the “DOS Control” mode. Then the actual measurement checks the size of the distance traveled by the carriage. Comparing the measurement with the readings in the DRO, you can determine the amount of correction to be introduced into the control system. The strip 23 is fed to the processing zone And

10 processing machine 24, such as a press or scissors.

The effect of using the device is to increase the reliability of work and the accuracy of the feed.

Claims (6)

1. A DEVICE FOR SUPPLYING THE SHEET TO THE TREATMENT AREA, comprising a feed carriage mounted on the base, driven by a drive through a chain transmission, a chain tensioning mechanism having at least one roller installed with the possibility of interaction with the chain, characterized in that the purpose of improving the reliability of operation and accuracy of supply, the drive is made in the form of a DC motor with adjustable speed of rotation from a thyristor converter connected with a digital display system, the device is equipped with evil measurement of the movement of the carriage associated with the digital display system, and the node correcting the magnitude of the movement of the carriage. FIG. one 1183253 2. Device by π. 1, characterized in that the unit for measuring the movement of the carriage is made in the form of a roller and a block mounted on both sides of the carriage and fitted with a tension mechanism, a cable thrown over the roller and the unit and connected to the carriage, a selsyn sensor connected to the drive and through a roller reducer. 3. Device by π. 1, characterized in that it is equipped with an electromagnetic brake connecting the drive with the chain transmission. 4. Device by π. 1, characterized in that the chain tensioning mechanism is made in the form of a power cylinder. 5. The device on π. 1, characterized in that the node correction of the magnitude of movement of the carriage is made in the form of sensors mounted on the base at a given distance from one another in the feed direction with the possibility of interaction with the carriage. 6. The device according to PP. 1 and 2, characterized in that the roller is made with a diameter O determined from the following relationship where N: is the indication system step; / - gear ratio; Όη-discreteness of the feed increment. one