SU119517A1 - The mechanism for moving the knife and girder of a single-blade paper cutter - Google Patents

Description

The mechanism for moving the knife and beam of a single-blade paper-cutting machine is known, made in the form of a system of levers receiving movement from the pistons of two hydraulic cylinders, one of which drives the knife and the other drives the beam, and both hydraulic cylinders are connected to the pump and oil tank by the oil pipe system , and for switching from idle to working and back, a three-position valve is used.

The described mechanism differs from the known fact that, in order to reduce the size of the machine and reduce the oil consumption, the pressure bar is equipped with a stop made, for example, in the form of a hinged roller, which interacts when the beam is lowered or when the knife is raised with the knife body, and the lower cylinder cavity The knife drive is connected directly to the oil tank by the oil pipe, which is equipped with a check valve.

To precisely stop the knife in the lower position on the oil line, which connects the upper cavity of the knife drive cylinder to the oil tank, the two-way valve with non-return valve is stopped. To reverse the movement of the knife, a hydraulic pressure switch is used, the inlet of which is connected to the lower cavity of the knife drive cylinder. The speed of movement of the knife is controlled by the choke, which is connected to the oil pipes, which drive the oil from the pump to the three-position spool and from the valve to the oil tank. The mechanism also uses a hydraulic shock absorber, the inlet of which is connected to the oil line between the pump and the three-position spool.

FIG. 1 shows a diagram of the mechanism for moving the knife and the clamp beam; in fig. 2 - diagram of the hydraulic drive.

The mechanism for moving the beam 1 includes a simple-action hydraulic cylinder 2, levers 3 supported at points 4

By iI95: 7-2 -

and connected at pinpoint g 5 with roll-com 6, interacting when lowering the clamp beam / or when raising the fire 7 with the knife body. The latter receives movement from the piston of a double-acting hydraulic cylinder 8 by means of levers 9 and tons of 10. The lower cavity of cylinder 2 is connected by an oil line to pump 11 and oil tank 2 by means of a three-position slide valve 13, which serves to switch the pistons of the cylinders from idle to working and back. Lower cylinder cavity. 5 is also connected to the three-position spool 13 via the pressure spool} 4 with a non-return valve, as well as directly to the oil tank 12 with another oil line equipped with a non-return valve 15. The upper cavity of the cylinder 8 is also connected with the oil spool 13 and the oil tank 12, two-position spool 16 and the pressure a spool 17 with a check valve serving to precisely stop the knife in the lower position.

For reversing the movement of the knife, a hydraulic pressure switch 18 is applied, connected to the lower cavity of the cylinder 5. The speed of movement of the knife is controlled by a throttle 19 with a regulator and a safety valve connected to the oil lines leading from the pump .// to the three-way slide valve 13 and from the valve to the oil tank 12 To dampen the blows, a damper 20 is mounted, connected to the oil pipe connecting pump 11 to the spool 13. A filter 21 is mounted in the oil line going to the oil tank 12. To switch the spool 13, electromagnet you are 22 and 23.

The operation of the mechanism is as follows. After turning on the motor of the pump 11, the oil sucked in by the pump from the oil tank 12 passes through the openings of the spool 13 and drains back into the tank, passing through the filter .27. Press the control button to turn on the electromagnet 22, which switches the valve / 5 to the right position. The oil from the spool through the oil pipe enters the lower cavity of cylinder 2 and lifts its piston with the rod, which rotates the levers 3 and lowers the clamp beam through the cables 5. Simultaneously with lowering the beam, the roller 6 presses on the knife body 7, which also drops down, and then through piston 10 and levers 9 the piston of the cylinder 8. The oil from the tank 12 through the check valve 15 begins to be sucked into the lower cavity of the cylinder 8. At the same time the upper cavity of the cylinder 8, the oil through the dual-inlet valve 16 enters the pressure valve 17, which creates a certain back pressure in the upper cavity of the cylinder 8, which prevents the spontaneous lowering of the knife, and further along the oil pipe through the valve 13 and the filter 21 is drained into AK-12.

After the beam / pressure is lowered onto the stack of paper, the pressure in the system begins to increase. When it reaches the value to which the pressure valve 14 is adjusted, the latter opens and the oil from the pump 11 starts to flow through the spools 13 and 14 into the lower cavity of the cylinder 8, and the check valve 15 closes at this moment. The knife stroke begins, during which the cutting of the foot takes place. When the knife reaches the lower position, the lever mechanism for driving the knife, pressing the valve head 16, will switch it; the spool 16 will shut off the oil outflow from the upper cavity of the cylinder 8. The piston of the cylinder and the knife stop. At the same time, the pressure in the cylinder and the system begins to increase. When the pressure reaches the value for which the pressure switch 18 is adjusted, the pressure switch of the pressure switch switches off the electromagnet 22 through the intermediate relay system and turns on the magnet 23. The spool 13 changes to the left position. Oil will begin to flow into the upper cavity of the cylinder 8, and the knife

rise up. At the same time, the oil from the lower cavity iuHJi.iHXpa 8 flows through the spools 14 and 13 into the tank 12. There also comes oil from the lower cavity of the cylinder 2. When the knife body 7, lift, reach the roller 6 of the clamp beam /, it will lift the clamp beam . A choke 19 with a regulator and a safety valve allows you to adjust the speed of movement of the knife, and a damper of 20 cm thickens shocks and shocks in the system when the spool is switched.

Item invented

Claims (5)

1.The mechanism for moving the knife and grip of a single-blade paper-cutting machine, made in the form of a system of levers receiving movement from two hydraulic cylinders, one of which drives the knife and the other drives the beam connected to the pump and the oil tank by an oil pipe system, switching the machine from idle to working and back, a three-position spool is used, characterized in that to reduce the size of the machine and reduce oil consumption, the pressure bar is equipped with a stop made, for example , A pivotally mounted roller interacting beams during lowering or lifting the blade from the blade housing, blade and the lower cavity of the cylinder actuator is coupled directly with the oil tank oil pipe provided with a check valve. 2. The mechanism according to claim 1, characterized in that to precisely stop the knife in its lower position on the oil line connecting the upper cavity of the knife drive cylinder to the oil tank, a two-position valve with a check valve is installed. 3.Mechanism popp. 1 and 2, characterized in that a hydraulic pressure switch is used to reverse the movement of the knife, the inlet of which is connected to the lower cavity of the fire actuator cylinder. 4. Mechanism on PP. 1.2 and 3, characterized in that a choke is used to control the speed of movement of the knife, which is connected to the oil lines leading from the pump to the three-position spool and from the valve to the oil tank. 5. The form of implementation of the mechanism of Popp. 1,2,3 and 4, characterized by the use of a hydraulic shock absorber, the inlet of which is connected to the oil line between the pump and the three-position spool. No. 1195