Modular excavator

A modular excavator, comprising a plurality of assembly modules that are detachably connected, the plurality of assembly modules comprising:

• a frame turntable base module;
• a track beam assembly module configured to be connected to the frame turntable base module;
• a track module configured to be connected to the track beam assembly module;
• a slewing drive module configured to be connected to the frame turntable base module;
• a power assembly module configured to be connected to the frame turntable base module;
• a counterweight module configured to be connected to the power assembly module;
• a cab module configured to be connected to the frame turntable base module;
• a fuel tank module configured to be connected to the frame turntable base module;
• a boom assembly module configured to be connected to the frame turntable base module;
• a bucket arm assembly module configured to be connected to the boom assembly module;
• and
• a work tool module configured to be connected to the bucket arm assembly module;
• wherein the modular excavator comprises two counterweight modules, the two counterweight modules comprising a lower counterweight module and an upper counterweight module, with guide posts being provided between connecting surfaces of the lower counterweight module and the upper counterweight module, the lower counterweight module and the upper counterweight module being locked by locking portions;
• and
• wherein the locking portion comprises:
• a chain;
• a hook provided on the lower counterweight module, a first end of the chain being hooked to the hook;
• an adjustment plate locked to the upper counterweight module in a position adjustable manner with respect to the upper counterweight module, and having a through hole, a second end of the chain passing through the through hole;
• and
• a stopper removably fixed to a side of the adjustment plate away from the hook, and configured to partially cover the through hole to restrict part of links of the chain between the hook and the stopper.