SU1253776A1 - Positional drive of working member for wood-working machine - Google Patents

Description

And obrostis belongs to woodworking and can be used in positioning drives for the movement of workers, for example, saw supports.

The purpose of the invention is to increase the reliability and VTiponieHHe design of the actuator.

On the league, 1 shows a schematic hydraulic circuit; in fig. 2 is an electrical circuit diagram of the device.

The discrete adjusting movements of the working body (caliper) I are carried out by an actuator (hydraulic cylinder) 2, the rod cavity 3 of which with the effective area of the piston F is permanently connected to the pressure line 4 of the hydraulic system. The piston cavity 5 of the hydraulic cylinders with the effective area of the piston F is connected through a control check valve (hydraulic lock) 6 to the output cavities of the hydraulic cylinders-dispensers 7j8 and 9. The volumes of the dispensing cylinders are measured and constructed according to the law of a binary weighted code, i.e. the volume of the first one is V, the second is 2 V, m., artillery 4 V, etc.

The input cavities of each metering cylinder can be connected to the pressure 10 or drain 11 lines of the hydraulic system by means of corresponding two-way electric control valves 12, the piston of each ilindra-metering device can take one of two stable positions depending on which of the two hydrodistributor magnets (odd or odd) ) included. When electric cables with odd numbers (V, V., V,) are switched on, the input cavities of the dispensers are connected to the drain line 11 of the hydraulic system and the pistons are retracted, i.e. are in the leftmost position (Fig. 1). In this case, the piston of the hydraulic cylinder 2 is in the right extreme position (the rod is retracted). When the electromagnets with even numbers (V, 1 V) are turned on, the input cavities of the dispensers

4 b

they are connected to the pressure line 10 of the hydraulic system and their pistons are displaced to the right, pushing out measured doses of oil into the Porsche section of the hydraulic cylinder 2.

The magnitude of the piston movement of the actuator 2 and rigidly

the working body connected with it is determined by the amount of fluid that has entered the piston cavity from the metering devices, while the corresponding amount of oil is forced out of the rod chamber of the hydraulic cylinder and drained, because F F (usually F, 2F).

The total number of N-discrete piston positions of the hydrocephrine is determined by

h

N 2

where n is the number of metering cylinders.

So according to the scheme shown in figure 1. the piston can occupy {1 mat one of 8 (2 8) discrete positions with a step determined by the volume of the dispenser 7, i.e. younger bit

The controlled return valve 6 plays the role of a hydraulic one, which locks the piston cavity of the hydraulic cylinder 5 and thereby reliably fixes the position of the piston when the electromagnet V is de-energized, an additional two-position electro-controlled hydraulic distributor 13.

The hydraulic system is powered by a pump 14 of constant capacity. A check valve 15 and an adjustable throttle 16 installed in the drain line 1 supply the working cavities of the metering cylinders when their pistons occupy the left (figure 1)

initial position. In this case, the errors caused by the leakage of 1 liquid are compensated.

The control ;-( the value of the discrete movement of the working body is carried out using a diode array encoder connected to the rectifier 17 (Fig. 2). The encoder consists of input vertical 18 and output horizontal 19 buses connected

between themselves through semiconductor diodes 20. The encoder (FIG. 2) has eight buses (determined by the number of required discrete positions of the working element) and seven horizontal busbarsfftrx buses to which the coils of electromagnetic relays P1 – P7 are connected. The relay contacts are located in the power circuit 21 and commutate the electromagnets V, - V, corresponding to on-off distributors.

The input buses of the encoder are connected to the closing contacts of the buttons S I - S of the position assignment. Pressing each

DOY BUTTON corresponds to the inclusion of a certain combination of electromagnetic relays and the electromagnets V, V controlled by them of two-way control valves. The relay P7, the coil of which is connected to the additional output bus 22, commutes an electrimagnetic V, two-way valve 13, which controls the hydraulic lock.

The device works as follows.

In the initial position, all the electromagnets of the on-off valves are de-energized, and the inlet cavities of the metering cylinders are connected to the drain 11, and the piston of the hydraulic cylinder 2 is retracted, and the oil in the piston cavity 5 is locked with a controlled check valve 6.

Let the working body be moved to the eighth position. To do this, the operator simply press the S button. In this case, thanks to the encoder, potential signals arrive at the P2, PA, P6 and P7 relays. These relays are triggered and their closing contacts include

V and V

fi 7

electroelectromagnets V, corresponding to two-position hydrodistributors. In this case, the inlet cavities of all metering cylinders are connected to the pressure line 10 of the hydraulic

to

- five

 5 3Q

go

25

the systems, their workpieces are swept over to yniipa and displace the corresponding dose of oil (V I 2 V + A V,} into the piston chamber of the hydraulic cylinder 2 (the hydraulic lock 6 is open, as the electromagnet V hydrodistributors 13 simultaneously operate).

As a result of this, the piston of the hydraulic cylinder moves along the scheme to the left by seven discrete units, i.e. from position 1 to position 8 (the volume of oil V, the dispenser 7 corresponds to the displacement of the piston 1; or the second 2 by one step).

The device makes it possible to increase the reliability of discrete control systems for the position of working bodies requiring frequent installation movements, as well as to simplify the design and reduce the axial dimensions of the actuator.

The reliability of the device compared to the prototype is achieved by replacing the multi-organ hydraulic positioner with rigid limiters of the individual pistons with a set of metering cylinders with measured volumes.

Replacing a multi-piston hydraulic positioner with a 1m hydro cylinder, connected in a differential circuit, simplifies the actuator of the device and reduces its axial dimensions.

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Editor T, Mnteiko

Compiled by V.Kitaev Tehred V.Kadar

Order 4668/17 Circulation 501.Subscription

VNIIPI USSR State Committee

state of affairs of inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

FIG. 2

Proofreader A. Obruchar

Claims (2)

POSITIVE DRIVE OF THE WORKING BODY OF THE WOODWORKING MACHINE, containing a hydraulic system with pressure and drain lines, a piston actuator, two-position electrically-operated directional control valves and an electric circuit with an encoder, the input of which is used to set the position buttons, and the output of the relay of the solenoid valves so that increase reliability and simplify the design of the actuator, the drive is equipped with a set of metering cylinders, the volumes of which are one other than the power of number 2, with an additional two-position electrically controlled hydraulic distributor and a controlled non-return valve control cavity connected to it, the inlet cavities of the metering hydraulic cylinders are connected to the outputs of the two-position hydraulic distributors, and their output cavities are interconnected and connected on one side through a controlled non-return valve with a piston cavity - <g of an additional mechanism, which is made in the form of a hydraulic cylinder, and on the other hand, through a check valve and a throttle with a drain line, m additional relay-off control valve is connected to a further bus encoder connected through isolating diodes from the reference position buttons. SU „„ 1253776 2,537 16