A demolition robot , comprising a robot arm with a saw tool with an exchangeable saw blade , wherein the saw tool comprises a rotatable spindle with an end portion (4.1) and the saw blade, comprises a hub , wherein the saw blade hub is arranged on the end portion (4.1) of the spindle with a torque-transmitting connection , characterized in that a release mechanism for automatic exchange of the saw blade is arranged on the robot arm , wherein the release mechanism comprises a remote-controllable hydraulic cylinder arranged on the robot arm and a manoeuvring sleeve coupled to the hydraulic cylinder via a displaceable manoeuvring means arranged in the spindle , and the torque-transmitting connection is configured as a conical connection, comprising an outer conical envelope surface (9.1) associated with the hub and an inner conical clamping surface (4.10) associated with the spindle, wherein the manoeuvring sleeve is arranged to cooperate with a blocking element integrated in the spindle , wherein the blocking element , has a first end with a plurality of radially outwardly directed pawls arranged around the circumference, and which are resilient and manoeuvrable in radially outward direction and configured to engage with and capture an inner conical engagement surface (9.5) of the hub, wherein in a locking state the manoeuvring sleeve is arranged to operate the blocking element under the influence of a tension force along the manoeuvring means wherein the blocking element in a locking state is arranged to releasably retain the saw blade hub , by pressing the pawls radially outwards for engagement with the engagement surface (9.5) of the hub, wherein in a release state, the hydraulic cylinder is activated, and the manoeuvring sleeve is caused to be displaced or pressed forward through the blocking element and the saw blade hub towards the saw blade , under the influence of the hydraulic cylinder, wherein the blocking element is caused to release the hub under the influence of the manoeuvring sleeve, and the saw blade hub is caused to be released from the end portion (4.1) of the spindle, wherein the saw blade comes loose from the spindle . wherein the manoeuvring sleeve is arranged to cooperate with a blocking element integrated in the spindle , wherein the blocking element , has a first end with a plurality of radially outwardly directed pawls arranged around the circumference, and which are resilient and manoeuvrable in radially outward direction and configured to engage with and capture an inner conical engagement surface (9.5) of the hub, wherein in a locking state the manoeuvring sleeve is arranged to operate the blocking element under the influence of a tension force along the manoeuvring means wherein the blocking element in a locking state is arranged to releasably retain the saw blade hub , by pressing the pawls radially outwards for engagement with the engagement surface (9.5) of the hub, wherein in a release state, the hydraulic cylinder is activated, and the manoeuvring sleeve is caused to be displaced or pressed forward through the blocking element and the saw blade hub towards the saw blade , under the influence of the hydraulic cylinder, wherein the blocking element is caused to release the hub under the influence of the manoeuvring sleeve, and the saw blade hub is caused to be released from the end portion (4.1) of the spindle, wherein the saw blade comes loose from the spindle . <EOS>