Method for determining pretightening force of adjacent main limb bolts of tower crane by utilizing locus characteristics of top end of tower crane and application thereof
A technology of bolt pre-tightening force and pre-tightening force, which is applied to cranes and other directions, can solve problems such as failure to achieve real-time monitoring, easy loosening of connecting bolts in standard joints, and no report of connecting parts, so as to achieve the effect of improving accuracy
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Embodiment 1
[0043] A method for determining the pretightening force of bolts on adjacent main limbs of a tower crane by using the trajectory characteristics of the top of the tower body, comprising the following steps:
[0044] (1) if figure 1 As shown, establish the fixed coordinate system and the dynamic coordinate system of the 3D model:
[0045] In the fixed coordinate system oxyz, the connection point between the tower body and the ground is taken as the coordinate origin o, and the fixed coordinate system oxyz origin o is the center point of the fixed section of the tower body on the ground; the positive direction of the coordinate axis x is the north direction of the ground; the coordinate axis The positive direction of y is the west direction of the ground; the positive direction of the coordinate axis z is vertical to the ground and coincides with the center line of the tower crane body;
[0046]In the moving coordinate system O'X'Y'Z', take the intersection point O' of the slew...
Embodiment 2
[0068] Such as image 3 , Figure 4 shown.
[0069] An application for judging the looseness of the adjacent main limb bolts of the tower crane by using the method described in embodiment 1, comprising the following steps:
[0070] (11) Set the early warning value Y of the pre-tightening force of the adjacent main limb bolts of the tower crane, the early warning value Y=K / a, where K is the factory design value of the pre-tightening force of the adjacent main limb bolts of the standard section, and the unit is Newton; the a=2;
[0071] (12) When the pretightening force Ka≥K / 2 of the adjacent main limb bolts of the tower crane found in the step (10), it is determined that the adjacent main limb bolts of the tower crane are in a safe loosening range; Ka
Embodiment 3
[0073] As described in Example 1, a method for judging the pretightening force of the bolts of the adjacent main limbs of the tower crane by using the trajectory characteristics of the top of the tower body. A collection of projected points in the O'X'Y' plane in the moving coordinate system O'X'Y'Z'.
[0074] As described in step (7), when drawing the top trajectory diagram of the tower body: as the pre-tightening force continues to decrease, the top trajectory diagram of the tower body first changes from a point to an approximate circle, and then gradually becomes an approximate circle with an inner concave area. circle, eventually gradually becoming an approximate circle with a concave circle.
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