DE2110841C3 - Safety shutdown device for eccentric presses, punches, scissors or similar working machines provided with a pressure fluid friction clutch and brake - Google Patents

Description

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2. Safety shutdown device according to Anspnich 1, characterized in that the switching element is a 2/2-way valve (8) located in the vent line (14) of the valve (4) for the pressure cylinder (S).

bevw out of the path with the Ex Snm rotating cam see the eccentric shaft in motion

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The present invention relates to a safety shutdown device according to the preamble of the preceding claim 1. B. as a result of a defect in the firing of the electrovalve, via which the clutch * and brake pressure chambers can be pressurized with pressure medium, during the "single stroke" mode of operation the machine ram is not stopped at top dead center of its stroke, but rather that it has one or more "Äe Afbeiöhfib | ^^^^^ S ^ * Nacfeseh1ageiw means but

_afaer a relatively cumbersome meden lever after the start-up penode

pUe, in which the nod occurs on ^ _{again ß} ^ _{the same}

kSSiwenkeii. The single items required for this are expensive to manufacture, and some are "no £ _ς" ; _a considerable wear and tear SfSS sufficient monitoring of the SnIlwig to disturbances in the work flow fuh-In addition a Sttllsetzvornchren K ^ ^^ ^ _p , ^ wewwgen die

tung ^ ^He _{possibilities screened} at de kk: ii - n machines

^sta ™; ' ^ng . . _another by the German Ge _rn, "u" _ÜSter 6,603,955 known Stillsetzvorrich- ^ aucnsmub _{tarnishing of the} eccentric shaft

tunghat ο ^ ^ ^ _angle jack, _{with roller}

gsgliedes from the motion _in motion ** ^^^ ^ _{erfolgeni which for} a Ge-X ^{e "a} D _rehwinke i of the eccentric shaft by means of a ^^. mechanism reversed to ma ^cn! V. ' _RBEI, however _{By J} h the oegebenen by the operator start pulse not the face ^ g ^ _{K Iung} b _{ver in} Dende

Je D ^ ckm.nei ^^ ^ _e ^ _sondem ^ _{νεη {} .,

the dth pressure medium supply to a reciprocating piston freely ^aa f ^u ' ^c _{only the} actuator swung out of the path ^' ^ "",. ^. Only after this of the N ° ^c "™ *. ^ _{0 before an} inevitable ^ ^ _1n opening of the PressenJKfL, ^ m engagement of the clutch delivered the required signal To change the approach of the cam to the actuator which is still in its trajectory and that the engagement of the press is not correct by J ^^ * g ^ Sl ££ Z

then
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_{also only a} slight delay of the ll bikt

manure

_uc «. _u is the task of Erfinuas for each revolution of the eccentric start of the same required return of the lever of the safety shutdown

before the eccentric shaft starts up

If a secure pressure medium is used,

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tlieses valve is over that

3 4

the switching element is built into the ventilation system after the solenoid valve 1 has been activated

2/2-way valve for the pressure cylinder located in the brake pressure chamber 2 pressure, which causes the release

valve is. the brake and the clutch engages. the

The crankshaft shown by the invention that can be achieved is now swiveling arrows of the lever out of the path of the cam in front of 5 direction 15 in motion. Meanwhile, that too When the eccentric shaft starts up, the individual valves 4 are opened in the brake pressure chamber 2 as a result of this Start-up of the eccentric shaft required switching pressure via the control cylinder 19 not so tightly packed in terms of time. It controls, blocks the cylinder space 13 from the pressure step a simplification of the device. Here- air source 12 from and instead connects it to mrt This results in an operationally safe way of working. OK of line 14.

The invention is explained in more detail below with reference to a After the eccentric shaft a certain rotation drawing, which has covered an embodiment at an eccentric angle and the cam 10 α already schematically represents the center press. has passed lever 11, actuates the cam

In the drawing, the brake pressure chamber 9a is the valve with 2, the line 14 being released

referred to, which is numbered 15 via the solenoid valve 1. The only purpose of valve 8 is to

Compressed air source 12 can be connected. Furthermore, due to its small mass, it swings in quickly

the brake pressure chamber 2 via a line 20 with the lever 11 in the path of the cam 10 a out-

a vent valve 3 in connection, which to hesitate. The air in the cylinder chamber 13 now flows

mechanically from one in its longitudinal direction via the valve 4 and the line 14 into the free air

sliding lever 11 is controlled. 20 atmosphere. The piston 6 is now under the action

In addition, the lever 11 is pivotally loaded with I-edern7 moved into its lower end position, whereby gert and can over the piston rod 16 of one of the levers 11 into the Baku of the cam 10a. Piston 6 into or out of the path of the cam 10 α . The correct function of the Stillsetzvorrichder cam disk 10 is to be pivoted. This device is ensured even when all Fe-cam disks 10 are broken for the sake of simplicity 35 to 7, which, however, should be driven by the eccentric shaft in practice, not shown in the manner not shown. In this case, the lever 11 is ben and therefore also rotates like the cams, namely by its own weight and that of the piston disk 9, synchronously with it. The cylinder chamber bens6 pivoted into the path of the cam 10 a. 13 of the pressure cylinder 5 in front of the by a set The press ram now performs a working stroke. Springs 7 in cylinder space 17 loaded piston 6 30. During the return stroke , for example, an impulse is emitted via a further valve 4 depending on its on by a limit switch, which is controlled via a valve 8 in line 14, wel- the electric valve 1 should change course. Normally, this layer is mechanically controlled by the cam disk 9, and the brake cylinder is vented with the free atmosphere or via a duct.

device 18 with the compressed air source 12 in direct 35 The brake is applied and brakes the eccentric connection. The control of the valve 4 takes place pneumatically. At the same time, the valve 4 sets the connection, therefore a second outlet for venting from the compressed air source 12 to the cylinder space processing valve 3 with its control cylinder in connection 13 of the pressure cylinder 5 again, whereby the Lever 11 in the starting position for a new work

This shutdown cycle is used to describe the mode of operation, since in the meantime also and

device is assumed to have a work cycle at approximately the same time as the control pulse

the end of which the response of the stopping device of the solenoid valve 1, the cam-controlled valve 8

is necessary in order to look up the press joint line 14 has shut off.

to prevent ßels. Should the ram even hit the top dead center

Before engaging the eccentric press, pass through a small angle, for example at

Switching the solenoid valve ;; 1 is the brake pressure- worn brake pads, so that's for

Room 2 is depressurized and therefore the brake is applied. the functioning of the shutdown device without

Because the shutdown device lasted long. In such cases, a per se unnecessary

Stroke has not responded, the control cylinder stops responding to the stopping device,

that of the valve 4 via the vent valve 3 to 50, which often leads to production stoppages when

the brake pressure chamber 2 and is consequently the brakes cannot be readjusted immediately

at the same time also depressurized. In this position of the vein.

tils 4 is the connection line 18 from the pressure. Works the solenoid valve 1 or its control

air source 12 to the cylinder space 13 of the pressure cylinder but not working properly, the eccentric shaft runs

ders5 free, and the piston 6 continues unabated against the we- 55. The cam 10 a meets the

action of the springs 7 in its drawn upper lever Yi and moves it in the longitudinal direction. There-

End position held. At the same time, the lever 11 is reversed by the vent valve 3, the

the path of the cam 10 a pivoted out. Since air from the brake pressure chamber 2 can enter the atmosphere

When the press ram is braked at top dead center, the sphere escapes and the brake is applied. This one

the position of the cams 9 a and 10 a with respect to the 60 for the sake of simplicity, not shown Mittet hold that

Lifts 11 and the feeler roller of valve 8 and vent valve 3 now in the newly occupied

As shown in the drawing, the line 14 is fixed in position so that no new working stroke takes place

Valve 8 shut off. can.

1 sheet of drawings

Claims (1)

2 UQ 8.41 I. Safety Smisetzvorrichtung for with one Pressure medium friction clutch «nd -brake ver eccentric presses, punches, scissors or Similar machines in which the eccentric shaft is stopped again after each rotation, with an in or out of the Path of a cam of a * grstei * ^ oqkqöscbeibe ^ ¥ fn | b ^ which revolves with the eccentric shaft ren LeverWe se & w pivoting stitches by running up the cam on him for the normal shutdown of the eccentric shaft, there is a vent valve for the clutch and brero-pressure spaces against spring force opens and which lever for this pivoting movement articulated against a piston rod of a valve-controlled Draclczylinder Spring force r-movable piston attached ^^^^ and can be brought out of its pivoted-in position by the pressure medium, with a second Cam disk through which the eccentric shaft starts rotating after a certain angle of rotation via a feeler roller attached to this second cam disk and one actuated by it Switching element of the pressure cylinder of the piston hinged to the lever is vented, characterized due to the commonality of the features:. a) The valve (4) for the pressure cylinder (5) is controlled by pressure medium; b) the control line (20) for this valve 4 is via the additional ventilation valve (3)