A puller includes a first claw and a second claw arranged opposite to each other. The first claw includes a first pulling part, a first limiting part and a first connecting part. The first limiting part includes a first body part, a first notch part and a second notch part. The second claw includes a second pulling part, a second limiting part and a second connecting part. The second limiting part includes a second body part, a third notch part and a fourth notch part. A size of the second pulling part is smaller than or equal to a size of the second notch part.

A puller includes a first claw and a second claw arranged opposite to each other. The first claw includes a first pulling part, a first limiting part and a first connecting part. The first limiting part includes a first body part, a first notch part and a second notch part. The second claw includes a second pulling part, a second limiting part and a second connecting part. The second limiting part includes a second body part, a third notch part and a fourth notch part. A size of the second pulling part is smaller than or equal to a size of the second notch part.

A system for removing and replacing fire-tubes. The system can include a powered system, a fire-tube puller coupled to said powered system. The fire-tube puller has a puller back which is coupled to a plug rest. A plug rest is approximately perpendicular to the puller back, and the fire-tube will rest upon the plug rest when the fire-tube is being removed or installed. The system can also include a stack adjuster which is coupled to the plug rest. The stack adjuster can couple to a stack so as to reposition the stack.

A system for removing and replacing fire-tubes. The system can include a powered system, a fire-tube puller coupled to said powered system. The fire-tube puller has a puller back which is coupled to a plug rest. A plug rest is approximately perpendicular to the puller back, and the fire-tube will rest upon the plug rest when the fire-tube is being removed or installed. The system can also include a stack adjuster which is coupled to the plug rest. The stack adjuster can couple to a stack so as to reposition the stack.

An automated system for assembling a framed article including a plurality of canvases and a plurality of assembled frames to be combined with the plurality of canvases to form the framed articles. Each assembled frame is formed of a rear panel and a frame member that are detachably attached to one another with one canvas being stretched across a front face of the frame member. The automated system includes an assembly station including a movable presser head that is configured to detach and lift the rear panel from the frame member and a plurality of movable side guide fingers that are configured to fold side edges of the canvas over sides of the frame member to permit the presser head to press the rear panel down over the folded side edges of the canvas into engagement with the frame member with the canvas being captured between the frame member and the rear panel.

An automated system for assembling a framed article including a plurality of canvases and a plurality of assembled frames to be combined with the plurality of canvases to form the framed articles. Each assembled frame is formed of a rear panel and a frame member that are detachably attached to one another with one canvas being stretched across a front face of the frame member. The automated system includes an assembly station including a movable presser head that is configured to detach and lift the rear panel from the frame member and a plurality of movable side guide fingers that are configured to fold side edges of the canvas over sides of the frame member to permit the presser head to press the rear panel down over the folded side edges of the canvas into engagement with the frame member with the canvas being captured between the frame member and the rear panel.

The present application provides a pin shaft dismounting and mounting device, a frame body connecting structure and work machine. The pin shaft dismounting and mounting device for dismounting and mounting a pin shaft on a connecting seat, the pin shaft is provided with a through hole along the axial direction, and the device includes: a linear drive mechanism, including telescopic rods; and a pull rod configured to pass through the through hole, a first end of the pull rod being provided with an end cap structure, a connecting structure is disposed between a second end of the pull rod and an end portion of each telescopic rod. By the pin shaft dismounting and mounting device, a frame body connecting structure and work machine, the pin shaft may be dismounted and mounted conveniently and the problems of wear and deformation of the piston rod are solved.

The present application provides a pin shaft dismounting and mounting device, a frame body connecting structure and work machine. The pin shaft dismounting and mounting device for dismounting and mounting a pin shaft on a connecting seat, the pin shaft is provided with a through hole along the axial direction, and the device includes: a linear drive mechanism, including telescopic rods; and a pull rod configured to pass through the through hole, a first end of the pull rod being provided with an end cap structure, a connecting structure is disposed between a second end of the pull rod and an end portion of each telescopic rod. By the pin shaft dismounting and mounting device, a frame body connecting structure and work machine, the pin shaft may be dismounted and mounted conveniently and the problems of wear and deformation of the piston rod are solved.

An apparatus is selectively controlled to insert a check pin into a fastener hole in a workpiece surface and remove the check pin from the fastener hole. The apparatus is a pneumatically actuated apparatus having a pair of press actuators that are selectively operated to press the check pin attached to a check pin holder of the apparatus into a fastener hole in a workpiece, and a pair of remove actuators that are selectively operated to push against the workpiece surface and move the apparatus away from the workpiece surface to remove the check pin attached to the check pin holder from the fastener hole in the workpiece.

An apparatus is selectively controlled to insert a check pin into a fastener hole in a workpiece surface and remove the check pin from the fastener hole. The apparatus is a pneumatically actuated apparatus having a pair of press actuators that are selectively operated to press the check pin attached to a check pin holder of the apparatus into a fastener hole in a workpiece, and a pair of remove actuators that are selectively operated to push against the workpiece surface and move the apparatus away from the workpiece surface to remove the check pin attached to the check pin holder from the fastener hole in the workpiece.