DE3025952A1 - Robot tool holder with weakened portion - has flanged connection between tool and its support arm, clamped by few clip members - Google Patents

Abstract

The weakened portion is intended to break on an impact, or collision. When this happens an emergency disconnection is actuated. Transverse to the normal load of the tool (7) is a flanged connection (3,6) between the latter and the tool carrying arm (1). The flanged connection is clamped together by the lowest possible number of clamping elements (5) with a limited force. At least in one flange is machined a passage (8), through which can flow a control medium. In the contact surface (13) of the respective flange, the passage opens into point ports (14), each pref. scaled by an O-ring. The ports may be uniformly distributed over the entire contact surface of the flange.

Description

Holder for a robot tool

The invention relates to a holder for a robot tool according to the preamble of claim 1.

There are brackets for attaching tools to machines or machines. Robots that are designed in such a way that in the event of a possible collision of the tool with another machine part or if the permissible load is exceeded same the tensioning elements provided with predetermined breaking points for the fastening of the tool and turn off the machine using a microswitch. Of the The firm seat of the tool must therefore be constantly monitored.

There are monitoring devices known for this that are used for sensitive Microswitches or initiators are designed.

However, these have the disadvantage that they are exposed to hard shock loads or if magnetic or inductive interference fields occur, such as B. for spot welding or inert gas welding systems, are not applicable.

The object of the invention is the known complicated, in structure to simplify partly voluminous and heavy monitoring devices or brackets and to make them universally applicable and functionally reliable.

This task is achieved by the characterizing features of the claim 1 solved.

With a tight fit of the two flanges and thus a tight contact area remains the pressure of the control medium, e.g. B.

Compressed air, constant at the channel inlet and outlet. Are the contact surfaces the two flanges, on the other hand, have become leaky due to the loosening of the clamping elements, so that control medium can flow out, then the pressure at the channel outlet and the connected pressure switch switches e.g.

the machine via an electrical contact. The sensitivity the monitoring can be arranged on the one hand at the channel entrance Adjust the pressure reducer and, on the other hand, the adjustable pressure switch that both stationary, d. H. separated from the robot tool, can be arranged. Through this are caused by a monitoring device, additional moving masses on Robot tools largely avoided. The compressed air circuit also monitors itself even, because if the air escapes due to leaks in the lines or screw connections ect. the pressure to the duct outlet drops.

In an advantageous embodiment of the invention, at the discharge point an O-ring is inserted into the branch bores to seal around the opening point be.

Finally, the branch holes can open out in several places, which are evenly distributed over the contact surface of the flange.

Based on an embodiment shown in the drawing the invention is to be explained in more detail.

The figure shows a perspective view of an inventive Holder for a tool on a robot with a loosened flange connection.

The holder shown in the figure for a robot tool consists from an arm carrying the tool, e.g.

B. from a working cylinder 1 with a piston rod 2 and a attached to this first flange 3, which thread 4 for clamping elements 5 for Has fastening a second flange 6. With the flange 6 is a tool z. B. a welding electrode 7 firmly connected. In the flange 3 is a channel 8 with a channel input 9 incorporated, which a pressure reducer 10 for a control medium is upstream. An adjustable pressure switch closes at the channel outlet 11 12 at. In the contact surface 13 of the flange 3, branch bores 14 are provided, which flow into channel 8. The branch bores 14 are with embedded O-rings 15 provided to the bores 14 against the flange 6 with tightened clamping elements 5 to seal well and to prevent unwanted leakage of the control medium.

How it works: The channel is created by a pressure source that is not shown 8 via the adjustable pressure reducer 1o with a control medium, e.g. B. with compressed air, applied. The one provided at the duct outlet 11, set to the same pressure Pressure switch 12 switches when the flanges 3, 6 are loosened, causing an outflow of control medium and causes a pressure reduction at the channel outlet 11 will, e.g. B. from the machine via an electrical contact. Blank page

Claims (3)

Claims X bracket for a robot tool with a collision yielding weak point as well as one triggered when the weak point yields Emergency shutdown, d a -d u r c h e k e n n n z e i c h n e t, that transverse to the normal load of the tool (7) a flange connection (3, 6) between the tool (7) and the the tool-carrying arm (1) is provided, the flange connection (3, 6) through the smallest possible number of clamping elements (5) with a defined, limited Clamping force is clamped together and that in at least one of the two flanges (3 or 6) incorporated a channel (8) that can be acted upon by a control medium is, the tap holes opening into the contact surface (13) of the flange (3 or 6) (14). 2. Holder according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that at the opening point of the branch bores (14) for sealing the outlet point is around / an O-ring (15) is embedded. 3. Holder according to claim 2, d a d u r c h g e k e n n -z e i c h n e t that the branch bores (14) open out at several points that are evenly are distributed over the contact surface (13) of the flange (3 or 6).