A combined electric tool coordination system includes a main tool (4) and an auxiliary tool (1). The main tool (4) and the auxiliary tool (1) coordinate for working. A load detection module (E1) is used to detect a load parameter that is generated when the main tool (4) operates, and send the load parameter to a central control module (E2). The central control module (E2) adjusts output power of the auxiliary tool (1). The central control module (E2) controls power of the auxiliary tool (1) to increase as the load parameter of the main tool (4) increases and decrease as the load parameter decreases. An automatic adjustment function of the auxiliary tool (1) is applied to a dust collector (1). When power of the main tool (4) increases, more dust and scraps are generated, suction of the dust collector (1) is automatically adjusted to be higher, and the demand of a large quantity of dust is satisfied; and when the power of the main tool (4) decreases, less dust and scraps are generated, power of the dust collector (1) automatically decreases, the suction is reduced, and the demand of a small quantity of dust is satisfied.

A dust box is provided that is configured to be removably mounted to a belt sander having a housing, and a discharge nozzle and a suction nozzle that are connected to the housing. The dust box has a first nozzle configured to be connected to the discharge nozzle, a second nozzle configured to be connected to the suction nozzle, a container part formed of synthetic resin and connected to the first and second nozzles, and a filter. The filter is configured to separate dust from air. The filter is provided within the container part to partition an inside space of the container part into a first space that communicates with the first nozzle and a second space that communicates with the second nozzle.

A belt grinding apparatus for grinding the tips of rotor blades supported on a rotating rotor. A casing contains the rotatable rotor. An opening in the casing permits access of a grinding belt into the casing where the belt grinds the tips of the blades rotating past. The belt grinding apparatus being attached at the opening at a parting line in the casing.

An abrasive article comprising an attachment layer and an abrasive layer. The attachment layer comprises a porous backing having a first major surface, an opposed second major surface, and a first plurality of voids extending from the first major surface to the second major surface. The abrasive layer has a third major surface and an opposed fourth major surface and comprises a cured composition, abrasive particles at least partially embedded in the cured composition, and a second plurality of voids extending from the third major surface to the fourth major surface. The first major surface of the attachment layer is adjacent the third major surface of the abrasive layer, and the pattern of the second plurality of voids is independent of the pattern of the first plurality of voids.

A belt grinding apparatus for grinding the tips of rotor blades is supported on a rotating rotor. A casing contains the rotatable rotor. An opening in the casing permits access of a grinding belt into the casing where the belt grinds the tips of the blades rotating past. The belt grinding apparatus is attached at the opening at a parting line in the casing.

A belt grinding apparatus for grinding the tips of rotor blades is supported on a rotating rotor. A casing contains the rotatable rotor. An opening in the casing permits access of a grinding belt into the casing where the belt grinds the tips of the blades rotating past. The belt grinding apparatus is attached at the opening at a parting line in the casing.

A combined electric tool coordination system includes a main tool (4) and an auxiliary tool (1). The main tool (4) and the auxiliary tool (1) coordinate for working. A load detection module (E1) is used to detect a load parameter that is generated when the main tool (4) operates, and send the load parameter to a central control module (E2). The central control module (E2) adjusts output power of the auxiliary tool (1). The central control module (E2) controls power of the auxiliary tool (1) to increase as the load parameter of the main tool (4) increases and decrease as the load parameter decreases. An automatic adjustment function of the auxiliary tool (1) is applied to a dust collector (1). When power of the main tool (4) increases, more dust and scraps are generated, suction of the dust collector (1) is automatically adjusted to be higher, and the demand of a large quantity of dust is satisfied; and when the power of the main tool (4) decreases, less dust and scraps are generated, power of the dust collector (1) automatically decreases, the suction is reduced, and the demand of a small quantity of dust is satisfied.

A dust collection container includes a hollow member having a storage space, a tubular member fixed to the hollow member and defining a passage communicating with the storage space of the hollow member, and a biasing member. The tubular member includes at least one tubular wall, a protrusion, and a wall part. The at least one tubular wall extends along a first axis extending in a first direction. The protrusion protrudes from a first one of an inner peripheral surface and an outer peripheral surface of the at least one tubular wall in a direction orthogonal to the first axis. The wall part protrudes from the first one of the inner peripheral surface and the outer peripheral surface on which the protrusion is disposed. The biasing member is adjacent to the wall part of the tubular member, and between the protrusion and the wall part in the first direction.

A belt grinding apparatus for grinding the tips of rotor blades supported on a rotating rotor. A casing contains the rotatable rotor. An opening in the casing permits access of a grinding belt into the casing where the belt grinds the tips of the blades rotating past. The belt grinding apparatus being attached at the opening at a parting line in the casing.

A method for shortening one or more rotor blade(s) (2) of a turbomachine (3) by removal of material at the blade tip, and apparatus (1; 19) for carrying out the method: a belt grinding apparatus (1; 19) shortens the rotor blades (2) and a contour of the blade tip is generated by a relative movement of the blade tip along the static belt grinding apparatus.