Attachment coupling device for heavy industrial equipment

An attachment coupling device for heavy industrial equipment comprising:

• a coupler body coupled to operation links of the heavy industrial equipment;
• a fixed hook fixedly mounted to the coupler body, to lock a first pin provided at an attachment;
• a movable hook spaced apart from the fixed hook, to lock a second pin provided at the attachment while being spaced apart from the first pin, the movable hook being rotatably coupled to the coupler body via a hook rotating shaft;
• an actuator connected, at one side thereof, to the movable hook via an actuator connecting pin while being rotatably connected, at the other side thereof, to the coupler body via a drive support shaft spaced apart from the hook rotating shaft such that the actuator is rotatable about the hook rotating shaft;
• and
• a pin locking unit coupled to the drive support shaft such that the pin locking unit is rotatable about the drive support shaft in accordance with an operation of the actuator, to lock not only the first pin coupled to the fixed hook, but also the movable hook, to which the second pin is coupled,
• wherein the pin locking unit comprises
• a pivot body rotatably coupled to the drive support shaft while being connected to the actuator,
• a hook support extending from one side of the pivot body in a normal direction of the drive support shaft, for locking of the movable hook, to which the second pin is coupled,
• a pin support extending from at least one of the pivot body and the hook support in a direction crossing the normal direction of the drive support shaft, for locking of the first pin coupled to the fixed hook, and
• a locking elastic member extending from the other side of the pivot body in a direction opposite to the extension direction of the pin support,
• wherein the pin support has an inclined support surface formed at a portion of the pin support facing the first pin coupled to the fixed hook, to press the first pin into a retaining groove provided at the fixed hook in accordance with rotation of the pivot body,
• wherein the inclined support surface is formed with a protruding surface in a direction in which the first pin is constrained so that the first pin is constrained by being in close contact with an inner surface of the retaining groove.