Mailbox punching device

A mailbox punching device, comprising:

• a baseplate;
• two frames which are correspondingly arranged at two ends of the top of said baseplate;
• a box arranged between said two frames on the two ends through a lifting device, wherein two end faces of said baseplate are simultaneously provided with a fixing block, and said fixing block is provided with a fixing hole;
• wherein the inner bottom of said box is provided with a first steering cavity with an opening facing downward, and a second steering cavity extends vertically in said box above said first steering cavity;
• wherein a first sliding groove is connectedly set on one inner wall of the second steering cavity, and a steering platform, through bearings, is rotatably mounted in said first steering cavity, wherein a first steering shaft, which extends into said second steering cavity, is fixedly arranged on the top of said steering platform, and a first bevel gear is fixedly mounted on said first steering shaft in said second steering cavity;
• wherein said first sliding groove is provided with a first sliding block that can be up and down slidably connected, which is provided with a first screw hole, and a first screw bolt is cooperatively mounted in said first screw hole, and the bottom of said first screw bolt is rotatably set in the inner bottom wall of said first sliding groove, and the top of said first screw bolt is in power connection with a first motor which is fixedly set in the inner top wall of said first sliding groove;
• wherein a second motor, one side of which is in power connection with a second steering shaft extending to said second steering cavity, is set in one end face of said first sliding block, and said second steering shaft in said second steering cavity is fixedly provided with a second bevel gear cooperatively connected to said first bevel gear, and said box, above said second steering cavity, is provided with a third steering cavity which is rotatably provided with a toothed connecting gear through a third steering shaft, wherein a third bevel gear, which is cooperatively connected with said toothed connecting gear, is rotatably mounted on the inner bottom wall of said third steering cavity, and said third steering shaft extending into said second steering cavity is fixedly set at the bottom end face of said third bevel gear, wherein said third steering shaft in said second steering cavity is fixedly provided with a fourth bevel gear matched with said second bevel gear, wherein the inner top wall of said third steering cavity is provided with a sliding cavity which extends to and passes through two sides of said box, and a sliding arm is slidably mounted on said sliding cavity, and the top end face of said sliding arm is fixedly provided with a toothed connecting strip which is cooperatively connected with said toothed connecting gear.