Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (10): 2785-2794.doi: 10.13229/j.cnki.jdxbgxb.20211337

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Calculation method of anti-backward-tilting buffer force of luffing jib tower crane

Yang LIU()   

  1. College of Engineering and Design，Hunan Normal University，Changsha 410081，China
  • Received:2021-12-06 Online:2023-10-01 Published:2023-12-13

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Abstract:

To address accurately calculate the buffer force of anti-backward-tilting device （ABTD） of luffing jib tower crane， considering the influence of tower body elastic vibration and boom rigid body rotation on the dynamics of ABTD， a mathematical model describing the relative movement of buffer is established. Combined with the buffer characteristic model of ABTD， the mathematical relationship between the buffer force of ABTD and dynamic characteristics of luffing jib tower crane is established. Taking a luffing jib tower crane equipped with hydraulic ABTD as the research object， multiple parameters of the buffer force calculation model are identified， and the buffer force calculation model is verified by a series of anti-backward-tilting test. According to the experimental value of buffer force of ABTD， the dynamic load factor of unloading load is calculated， and the relevant requirements of dynamic load factor under sudden unloading condition in Design Rules for Cranes are corrected， which provides a reference for the revision of relevant national standards for the design of luffing jib tower crane.

Key words: mechanical design and theory, luffing jib tower crane, buffer force, non-parametric model, dynamic load factor

CLC Number: 

  • TH212

Fig.1

Model of luffing jib tower crane"

Fig.2

Dynamic model of buffer"

Fig.3

Boom tilt back model during unloading"

Fig.4

Test device for unloader"

Fig.5

Tension response and shock spectrum of unloader"

Fig.6

Prototype of ABTD"

Fig.7

Test device for hydraulic buffer characteristics"

Fig.8

Series actuation motion and force response"

Fig.9

Relationship between series operating speed andoperating force"

Fig.10

Prototype of luffing jib tower crane"

Fig.11

Bending vibration mode of luffing jib tower crane"

Fig.12

Structure deformation of luffing jib tower crane under loading"

Table 1

Deformation of tower body in series test"

吊重臂根横向变形门架横向变形缓冲杆与缓冲缸的相对位移
54%额定载荷173821
60%额定载荷183921
67%额定载荷204222
73%额定载荷184729
100%额定载荷296536

Fig.13

Dynamic response of ABTD in unloading test"

Fig.14

Hydraulic pressure of series unloading test"

Table 2

Peak value of damping force under series unloading test conditions"

卸载载荷阻尼力 实验值/kN阻尼力 计算值/kN误差/%
54%额定载荷24.022.17.9
60%额定载荷28.024.711.8
67%额定载荷28.526.47.4
73%额定载荷30.532.04.9

Table 3

Dynamic load factor in series test"

卸载载荷动载系数实验值1动载系数实验值2动载系数计算值误差/%
54%额定载荷0.410.420.402.4
60%额定载荷0.400.410.385.0
67%额定载荷0.360.370.352.8
73%额定载荷0.340.340.352.9
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