The steel structure workshop cranes the most tire cranes, crawler cranes and some truck crane and a dedicated mobile cranes are mounted lattice boom and top pulley block lifting device to change the position of the wire rope liter, in order to achieve the weights lift; longer be changed by changing the the truss arm's length and tilt angle to promote height and radius. Therefore, maintaining the integrity of the lattice boom is very important. These can cause varying degrees of lattice boom crane lifting heavy objects operating content diversity and a wide range of operating environments, as well as the level of the driver of the crane operation, and other reasons (and some illegal operations), injury, and even folding arm or casualties. 1 crack
The tube truss arm steel pipe is welded at very prone to crack; carefully view the magnifying glass to carefully observe the necessary application. Based on our years of experience in the weld cracks at the very hour, it is necessary to conduct regular follow-up checks, pay close attention to the development and changes of the crack, in order to take timely measures. When the width of the crack is large enough to more than 1mm, it shall promptly repair welding. The specific method is to first crack at the original weld grinding, remove the number, as the case may be; then repair welding; the last renovation can.
Lattice boom pipe surface pit when the pit depth of the steel pipe of the arm thickness dimensions, and the deformation of the pits to reach 25mm in diameter (diameter of 2 ~ 5mm), and a ruler, if the position of the pit on the lattice boom steel surface can be measured in accordance with the method shown in Figure 1, the depth of the pit, the upcoming selecting steel balls into the pit, if the steel ball on the upper vertex just in contact with the lower edge of the rectangular, then we can depending Ball the diameter of the depth of the pit. If the position of the pit in the side surface of the steel pipe or below, can be first with butter sticking to the ball and then measured. Damage of such maintenance, available welded steel pipe of the same general material as the original steel reinforcement (see Figure 2), i.e. divided into two halves take a period of pipe along the centerline of its ends bevelled Stock weld perpendicular to the arm of the trussin the longitudinal direction of the steel pipe. Above the original lattice boom pipe to be welded at must be painted before welding polished clean, good preparation before welding single serious injury of steel pipe truss arm
When the the lattice boom steel structure workshop root steel surface damage is more serious, should be taken to remove the serious injury section of steel pipe, re-weld on a section of steel pipe processing, but must be coupled with a period of strengthening steel pipe inside the steel pipe. Section of the truss arm steel pipe has been removed so that before welding to strengthen steel pipe insertion to strengthen the steel pipe should be made of the same length of two sections (see Figure 3a and Figure 3b), and has threaded and welded two ways to connect . Strengthen the pipe L1 and L2 of the length to be removed than the lattice boom pipe section of short 20mm, and its outer diameter than lattice boom steel pipe inner diameter 20 to 40μm, to the reinforcing pipe in both can move within the lattice boom pipe is no longer loose. First strengthen steel pipe L1 and L2 respectively inserted into the the lattice boom steel pipe, and threaded connections to get up, and then tighten the two shaft shoulder by Yan, held pinpoint to strengthen steel pipe location, respectively the screw in position after, respectively, at the screw and two weld it either. The truss arm steel pipe weld to be made slant, its steel tube axis perpendicular angle between 10 ° ~ 30 °, such as damage to the tubes, should choose 10 °. At this point, and then carefully measuring the lattice boom pipe welding after the actual gap size, and with reference to the shape shown in Figure 2, the next section of steel pipe material, ends made 30 slant, sectioned along the middle of welding, in the notch of the lattice boom pipe; finishing, paint can
Often detect the steel structure workshop arm section pin pin is also connected at the top of the arm section (hook block group), middle arm section (fixed) telescopic cylinders, the basis of arm section (turntable, luffing cylinder block rope pulley shaft), etc. should always check.When the wear amount of 5% of the original size, shall be promptly replaced. Check, also the tube lattice boom on a supporting point, remove a check one, and then install a by root check until the check is comple
The tube truss arm steel pipe is welded at very prone to crack; carefully view the magnifying glass to carefully observe the necessary application. Based on our years of experience in the weld cracks at the very hour, it is necessary to conduct regular follow-up checks, pay close attention to the development and changes of the crack, in order to take timely measures. When the width of the crack is large enough to more than 1mm, it shall promptly repair welding. The specific method is to first crack at the original weld grinding, remove the number, as the case may be; then repair welding; the last renovation can.
Lattice boom pipe surface pit when the pit depth of the steel pipe of the arm thickness dimensions, and the deformation of the pits to reach 25mm in diameter (diameter of 2 ~ 5mm), and a ruler, if the position of the pit on the lattice boom steel surface can be measured in accordance with the method shown in Figure 1, the depth of the pit, the upcoming selecting steel balls into the pit, if the steel ball on the upper vertex just in contact with the lower edge of the rectangular, then we can depending Ball the diameter of the depth of the pit. If the position of the pit in the side surface of the steel pipe or below, can be first with butter sticking to the ball and then measured. Damage of such maintenance, available welded steel pipe of the same general material as the original steel reinforcement (see Figure 2), i.e. divided into two halves take a period of pipe along the centerline of its ends bevelled Stock weld perpendicular to the arm of the trussin the longitudinal direction of the steel pipe. Above the original lattice boom pipe to be welded at must be painted before welding polished clean, good preparation before welding single serious injury of steel pipe truss arm
When the the lattice boom steel structure workshop root steel surface damage is more serious, should be taken to remove the serious injury section of steel pipe, re-weld on a section of steel pipe processing, but must be coupled with a period of strengthening steel pipe inside the steel pipe. Section of the truss arm steel pipe has been removed so that before welding to strengthen steel pipe insertion to strengthen the steel pipe should be made of the same length of two sections (see Figure 3a and Figure 3b), and has threaded and welded two ways to connect . Strengthen the pipe L1 and L2 of the length to be removed than the lattice boom pipe section of short 20mm, and its outer diameter than lattice boom steel pipe inner diameter 20 to 40μm, to the reinforcing pipe in both can move within the lattice boom pipe is no longer loose. First strengthen steel pipe L1 and L2 respectively inserted into the the lattice boom steel pipe, and threaded connections to get up, and then tighten the two shaft shoulder by Yan, held pinpoint to strengthen steel pipe location, respectively the screw in position after, respectively, at the screw and two weld it either. The truss arm steel pipe weld to be made slant, its steel tube axis perpendicular angle between 10 ° ~ 30 °, such as damage to the tubes, should choose 10 °. At this point, and then carefully measuring the lattice boom pipe welding after the actual gap size, and with reference to the shape shown in Figure 2, the next section of steel pipe material, ends made 30 slant, sectioned along the middle of welding, in the notch of the lattice boom pipe; finishing, paint can
Often detect the steel structure workshop arm section pin pin is also connected at the top of the arm section (hook block group), middle arm section (fixed) telescopic cylinders, the basis of arm section (turntable, luffing cylinder block rope pulley shaft), etc. should always check.When the wear amount of 5% of the original size, shall be promptly replaced. Check, also the tube lattice boom on a supporting point, remove a check one, and then install a by root check until the check is comple
Great blog,I read your article and giving useful information by you...a lot of thanks.. Truck crane servicing.
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