Fixed-center circle drawing tool
A technology of setting the center of a circle and drawing a circle, which is applied to roads, road repairs, roads, etc., can solve the problems of cutting circles not concentric with the wellbore, damage and cracking, etc., and achieve the effects of small deviation, high accuracy and low cost
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[0018] Such as figure 1 , figure 2 As shown, a tool for setting the center of a circle and drawing a circle includes a vertical rod 1, and also includes a conical platform 9 for determining the center of the wellbore and for carrying the vertical rod 1. The diameter of the top surface of the conical platform 9 is larger than the diameter of the wellbore 30-50mm, the diameter of the bottom surface of the conical platform 9 is 30-50mm smaller than the diameter of the shaft; the center of the conical platform 9 is provided with a vertical rod socket 10, which is the same The shaft is set; the bottom of the vertical rod 1 is detachably connected with the vertical rod bearing socket 10.
[0019] The vertical rod 1 is sleeved with a height adjustment ring 8 that can move up and down along the vertical rod 1. The height adjustment ring 8 is fixedly connected with the inner ring of the bearing 7; The shaft is hingedly connected with the connecting block 3; the telescopic rod 4 is p...
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