A heavy tower crane boom structure based on improved steel pipe

Abstract

The invention discloses a heavy tower crane boom structure based on an improved steel pipe, comprising a base, a conversion part and an extension part connected in sequence; the base part comprises a fixed plate, a first connecting plate, a first lower chord tube and a first upper chord tube connected in sequence, and a first belly tube and a second belly tube are arranged between the first lower chord tube and the first upper chord tube; the conversion part comprises a second connecting plate, a second lower chord tube, a second upper chord tube and a third connecting plate connected in sequence, and a third belly tube and a fourth belly tube are connected between the second upper chord tube and the second lower chord tube; the extension part comprises a fourth connecting plate, a third lower chord tube, a third upper chord tube and an end plate connected in sequence, and a fifth belly tube and a sixth belly tube are connected between the third lower chord tube and the third upper chord tube; the structure of the invention is reasonably designed, has high stability, and is suitable for popularization and use.

Description

Technical Field

[0001] The invention relates to the technical field of tower cranes, and in particular to a heavy tower crane boom structure based on an improved steel pipe. Background Art

[0002] Tower cranes are also called tower cranes, which originated in Western Europe. According to records, the first patent for tower cranes for construction was issued in 1900. In 1905, a crane with a fixed tower body and a boom was produced. In 1923, the prototype of a modern tower crane was made, and the first relatively complete modern tower crane appeared in the same year. In 1930, Germany began to mass-produce tower cranes and used them in construction. In 1941, the German industrial standard DIN8770 for tower cranes was announced. This standard stipulates that the lifting capacity of a tower crane is expressed by the product (tm) of the load (t) and the amplitude (m) together with the gravity moment.

[0003] my country's tower crane industry started in the 1950s. Compared with the downturn in the tower crane industry in Central and Western European countries due to the sluggish construction industry, my country's tower crane industry is in a period of rapid development. With the continuous development of the tower crane industry, although new products emerge in an endless stream, and new products have improved in production efficiency, ease of operation, easy maintenance and reliable operation, the technology of tower cranes has not changed fundamentally. The research on tower cranes is developing towards modularization. The so-called modularization is to take the tower structure as the core, decompose the tower body into several parts according to the structural and functional characteristics, and divide each part into several modules according to the requirements of serialization and generalization and the principle of modular system. According to the parameter requirements, appropriate modules are selected to form tower cranes with different technical performance characteristics to meet the specific needs of construction; the promotion of modular tower cranes will help speed up the development of tower crane products, save product development costs, and better serve customers.

[0004] However, in order to ensure the rigidity of the boom, the existing boom for combined tower cranes is overloaded during the manufacturing process, which not only increases the deadweight of the boom and wastes steel, but also limits the lifting capacity of the boom. Summary of the invention

[0005] In view of the above-mentioned technical problems, the present invention provides a heavy tower crane boom structure based on an improved steel pipe.

[0006] The technical solution of the present invention is: a heavy tower crane boom structure based on an improved steel pipe, comprising a base, a conversion portion and an extension portion; the base comprises a fixed plate, a first connecting plate, a first lower chord tube and a first upper chord tube; a connecting portion is movably provided on one side of the fixed plate, the fixed plate and the first connecting plate are horizontally arranged in parallel, two first lower chord tubes and two first upper chord tubes are provided, two ends of the two first lower chord tubes are respectively connected to the lower position of the side opposite to the fixed plate and the first connecting plate, two ends of the two first upper chord tubes are respectively connected to the upper position of the side opposite to the fixed plate and the first connecting plate, a plurality of first belly tubes are arranged in parallel between the two first lower chord tubes and between the two first upper chord tubes, and a plurality of second belly tubes are evenly distributed between the two groups of first lower chord tubes and first upper chord tubes corresponding to the upper and lower positions;

[0007] The conversion part includes a second connecting plate, a second lower chord tube, a second upper chord tube and a third connecting plate; the second connecting plate and the third connecting plate are arranged horizontally in parallel, the second connecting plate is fixed to the first connecting plate by bolts, two second lower chord tubes and two second upper chord tubes are arranged, two ends of the two second lower chord tubes are respectively connected to the lower position of the side opposite to the second connecting plate and the third connecting plate, and two ends of the two second upper chord tubes are respectively connected to the upper position of the side opposite to the second connecting plate and the third connecting plate; a plurality of third belly tubes are arranged in parallel between the two second lower chord tubes and between the two second upper chord tubes, and a plurality of fourth belly tubes are evenly distributed between the two groups of second lower chord tubes and second upper chord tubes corresponding to the upper and lower positions;

[0008] The extension part includes a fourth connecting plate, a third lower chord tube, a third upper chord tube and an end plate. The fourth connecting plate is fixed to the third connecting plate by bolts. The fourth connecting plate and the end plate are horizontally arranged in parallel. Two third lower chord tubes are provided. Both ends of the two third lower chord tubes are respectively connected to the lower position of the side opposite to the fourth connecting plate and the end plate. One third upper chord tube is provided. Both ends of the third upper chord tube are respectively connected to the upper position of the side opposite to the fourth connecting plate and the end plate. Several fifth abdominal tubes are arranged in parallel between the two third lower chord tubes. Several sixth abdominal tubes are evenly distributed between the third upper chord tube and the two third lower chord tubes. After the base, the conversion part and the extension part are connected, the end is connected to the guide rail by bolts.

[0009] Furthermore, the first connecting plate, the second connecting plate, the third connecting plate and the fourth connecting plate are all penetrated by reinforcement sleeves. After the second connecting plate is connected to the first connecting plate, and the fourth connecting plate is connected to the third connecting plate, a reinforcement rod is inserted between two adjacent reinforcement sleeves. The reinforcement sleeves and the reinforcement rods are fixedly connected by bolts. By arranging the reinforcement sleeves and the reinforcement rods, the connection between the base, the conversion part and the extension part is more stable and reliable.

[0010] Furthermore, both ends of the first lower chord tube and the first upper chord tube are provided with docking joints, and the first lower chord tube and the first upper chord tube are respectively fixedly connected to the fixing plate and the first connecting plate through the docking joints; the inner sides of the ends of the first lower chord tube and the first upper chord tube are provided with positioning keys, and key slots are provided on the docking joints at positions corresponding to the positions of the positioning keys, and the key slots and the positioning keys match each other. By providing the docking joints, the positioning of the first lower chord tube and the first upper chord tube during construction and installation is more accurate, thereby improving the straightness of the base.

[0011] Furthermore, a cavity is provided on the side wall of the butt joint, a threaded block is movably provided inside the cavity, a compression spring is provided at the connection between the threaded block and the cavity, and tensioning screws are provided at the ends of the first lower chord tube and the first upper chord tube corresponding to the positions of the threaded blocks. By providing the threaded block and the tensioning screws, the first lower chord tube and the first upper chord tube can maintain a stable state after being docked with the butt joint, which is beneficial to the welding reinforcement of the first lower chord tube and the first upper chord tube.

[0012] Furthermore, reinforcing ribs are provided at the connections between the reinforcement sleeve and the first connecting plate, the second connecting plate, the third connecting plate and the fourth connecting plate. By providing the reinforcing ribs, the reliability of the connection between the reinforcement sleeve and the first connecting plate, the second connecting plate, the third connecting plate and the fourth connecting plate can be improved, thereby improving the stability of the crane arm during lateral swing.

[0013] Furthermore, the second abdominal tubes located at the front and rear ends of the base are parallel to each other and are arranged in an interlaced manner. The arrangement of the second abdominal tubes in an interlaced manner is beneficial to improving the shear resistance in all directions of the base.

[0014] Furthermore, the longitudinal sections of the fixed plate, the first connecting plate and the second connecting plate are all regular quadrilaterals, and the sizes of the fixed plate, the first connecting plate and the second connecting plate are the same; the longitudinal sections of the third connecting plate, the fourth connecting plate and the end plate are all regular triangles, and the sizes of the third connecting plate, the fourth connecting plate and the end plate decrease successively. Through the above design, the deadweight of the crane arm can be reduced and the lifting capacity of the crane arm can be increased.

[0015] Furthermore, folding plates are provided at the lower ends of the fixed plate, the first connecting plate, the second connecting plate, the third connecting plate, the fourth connecting plate and the end plate, and the guide rail is fixedly connected to each folding plate by bolts. By providing the folding plates, the connection between the guide rail and the lifting arm is more reliable.

[0016] Furthermore, a connecting part is movably provided on one side of the fixed plate, and a buffer assembly is provided at the connection part, the buffer assembly includes a plug-in sleeve and a plug-in rod, the plug-in sleeve is fixedly provided on the connecting part, sliding grooves are provided on the front and rear sides of the inner wall of the plug-in sleeve, the plug-in rod is fixedly provided on one side of the fixed plate, and buffer seats are provided on the front and rear sides of the outer wall of the plug-in rod, and the two buffer seats are movably clamped in the two sliding grooves respectively; inside the two sliding grooves, and on both sides of the two buffer seats, two engaging blocks are symmetrically provided, and the ends of the two engaging blocks away from each other are respectively abutted against the sliding grooves through a first buffer spring, and when the boom swings laterally, the buffer seat pressurizes the engaging blocks at the corresponding position, and uses the first buffer spring to buffer the lateral swing of the boom, so as to avoid damage to the tower base during the swing of the boom, which is beneficial to improving the safety of the heavy tower crane.

[0017] Furthermore, each engaging block is connected to a sliding sleeve on both sides through a pushing rod, and a sliding rod is provided at a position inside the sliding groove corresponding to the position of each sliding sleeve, and a movable sleeve of the sliding sleeve is provided on the sliding rod; a second buffer spring is provided on the sliding rod and on both sides of the sliding sleeve. When the engaging block moves, the sliding sleeve is pushed to move on the sliding rod, and the second buffer spring is used to perform secondary buffering on the lateral swing of the crane arm.

[0018] The installation method of the present invention comprises the following steps:

[0019] S1, respectively fix the first lower chord tube and the first upper chord tube by docking with the butt joints on the fixing plate and the first connecting plate, and then respectively fix the first lower chord tube and the first upper chord tube to the fixing plate and the first connecting plate by secondary welding; respectively weld and fix the first belly tube and the second belly tube between the first lower chord tube and the first upper chord tube;

[0020] S2, respectively welding and fixing the two ends of the second lower chord tube and the second upper chord tube to the second connecting plate and the third connecting plate, and then respectively welding and fixing the third belly tube and the fourth belly tube between the second lower chord tube and the second upper chord tube;

[0021] S3, respectively welding and fixing the two ends of the third lower chord tube and the third upper chord tube to the fourth connecting plate and the end plate, and then respectively welding and fixing the fifth belly tube and the sixth belly tube between the third lower chord tube and the third upper chord tube;

[0022] S4, first connect the first connecting plate, the second connecting plate, the third connecting plate and the fourth connecting plate through the reinforcement sleeve and the reinforcement rod, and then fix the first connecting plate and the second connecting plate, and the third connecting plate and the fourth connecting plate through bolts;

[0023] S5. movably connect the connecting part with the connecting rod on the fixed plate through the connecting sleeve, and finally fix the guide rail with the fixed plate, the first connecting plate, the second connecting plate, the third connecting plate, the fourth connecting plate, and the folding plate on the end plate respectively.

[0024] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0025] First, the structural design of the present invention is reasonable. By setting bases, conversion parts and extension parts of different shapes, the weight of the boom of the present invention is reduced to the maximum extent, the use of steel and production costs are saved, the lifting capacity of the boom is increased, and the working efficiency and production efficiency of the tower crane are improved;

[0026] Second, the base, the conversion part and the extension part of the present invention are firstly fixedly connected by the reinforcement sleeve and the reinforcement rod, and then connected in sequence by the first connection plate, the second connection plate, the third connection plate and the fourth connection plate, which not only improves the overall structural stability of the boom, but also reduces the difficulty of overall manufacturing of the boom;

[0027] Thirdly, a buffer assembly is arranged between the base and the connecting part of the present invention, which can buffer the lateral swing generated during the operation of the boom, avoiding damage to the tower base during the swing of the boom, thereby improving the stability and safety of the heavy tower crane; at the same time, during the installation of the base part of the present invention, the docking joint is used to achieve precise positioning of the first lower chord tube and the first upper chord tube, thereby improving the straightness and structural stability of the base structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of the present invention;

[0029] Figure 2 is a top view of the present invention;

[0030] Figure 3 It is a schematic diagram of the connection between the slide rail and the folding plate of the present invention;

[0031] Figure 4 is a connection schematic diagram of the first connection plate of the present invention;

[0032] Figure 5 It is a schematic diagram of the connection between the first lower chord tube, the first upper chord tube, the fixing plate and the first connecting plate of the present invention;

[0033] Figure 6 is a schematic diagram of the connection between the first lower chord tube and the butt joint of the present invention;

[0034] Figure 7 is a schematic structural diagram of a third connecting plate of the present invention;

[0035] Figure 8 is a schematic structural diagram of a buffer assembly of the present invention;

[0036] Fig. 9 It is a distribution diagram of the engaging blocks of the present invention in the plug sleeve;

[0037] Among them, 1-base, 10-fixed plate, 11-first connecting plate, 12-first lower chord tube, 13-first upper chord tube, 14-first abdominal tube, 15-second abdominal tube, 16-joint, 160-position key, 161-keyway, 162-cavity, 163-thread block, 1630-compression spring, 164-tensioning screw, 2-conversion part, 20-second connecting plate, 21-second lower chord tube, 22-second upper chord tube, 23-third connecting plate, 24-third abdominal tube, 25-fourth abdominal tube, 3-extension part, 30-fourth connecting plate, 31-third lower chord tube, 32-third upper chord tube, 33-end plate, 34-fifth abdominal tube, 35-sixth abdominal tube, 36-guide rail, 360-folding plate, 4-connecting part, 5-reinforcement sleeve, 50-reinforcement rod, 51 reinforcing rib plate, 6-buffer assembly, 60-plug sleeve, 600-sliding groove, 601-embracing block, 602-first buffer spring, 603-push rod, 604-sliding sleeve, 605-sliding rod, 606-second buffer spring, 61-plug rod, 610-buffer seat. DETAILED DESCRIPTION

[0038] Example 1

[0039] like Figure 1 , 2 , 3, a heavy tower crane boom structure based on an improved steel pipe, comprising a base 1, a conversion portion 2 and an extension portion 3; the base 1 comprises a fixed plate 10, a first connecting plate 11, a first lower chord tube 12 and a first upper chord tube 13; a connecting portion 4 is movably provided on one side of the fixed plate 10, the fixed plate 10 and the first connecting plate 11 are horizontally arranged in parallel, two first lower chord tubes 12 and two first upper chord tubes 13 are provided, two ends of the two first lower chord tubes 12 are respectively connected to the lower position of the side opposite to the fixed plate 10 and the first connecting plate 11, and two ends of the two first upper chord tubes 13 are respectively connected to the upper position of the side opposite to the fixed plate 10 and the first connecting plate 11, a plurality of first belly tubes 14 are parallelly provided between the two first lower chord tubes 12 and the two first upper chord tubes 13, and a plurality of second belly tubes 15 are evenly distributed between the two groups of first lower chord tubes 12 and first upper chord tubes 13 corresponding to the upper and lower positions;

[0040] like Figure 2 , 3As shown, the conversion part 2 includes a second connecting plate 20, a second lower chord tube 21, a second upper chord tube 22 and a third connecting plate 23; the second connecting plate 20 and the third connecting plate 23 are arranged horizontally in parallel, the second connecting plate 20 is fixed to the first connecting plate 11 by bolts, two second lower chord tubes 21 and two second upper chord tubes 22 are provided, two ends of the two second lower chord tubes 21 are respectively connected to the lower position of the side opposite to the second connecting plate 20 and the third connecting plate 23, and two ends of the two second upper chord tubes 22 are respectively connected to the upper position of the side opposite to the second connecting plate 20 and the third connecting plate 23; a plurality of third belly tubes 24 are arranged in parallel between the two second lower chord tubes 21 and the two second upper chord tubes 22, and a plurality of fourth belly tubes 25 are evenly distributed between the two groups of second lower chord tubes 21 and second upper chord tubes 22 corresponding to the upper and lower positions;

[0041] like Figure 2 , 3 As shown, the extension portion 3 includes a fourth connecting plate 30, a third lower chord tube 31, a third upper chord tube 32 and an end plate 33. The fourth connecting plate 30 is fixed to the third connecting plate 23 by bolts. The fourth connecting plate 30 and the end plate 33 are arranged horizontally in parallel. Two third lower chord tubes 31 are provided, and the two ends of the two third lower chord tubes 31 are respectively connected to the lower position of the side opposite to the fourth connecting plate 30 and the end plate 33. One third upper chord tube 32 is provided, and the two ends of the third upper chord tube 32 are respectively connected to the upper position of the side opposite to the fourth connecting plate 30 and the end plate 33. Several fifth abdominal tubes 34 are arranged in parallel between the two third lower chord tubes 31, and several sixth abdominal tubes 35 are evenly distributed between the third upper chord tube 32 and the two third lower chord tubes 31. After the base 1, the conversion portion 2 and the extension portion 3 are connected, the ends are connected to the guide rails 36 by bolts.

[0042] Example 2

[0043] like Figure 1 , 2, 3, 5, and 6 show a heavy tower crane boom structure based on an improved steel pipe, comprising a base 1, a conversion portion 2, and an extension portion 3; the base 1 comprises a fixed plate 10, a first connecting plate 11, a first lower chord tube 12, and a first upper chord tube 13; a connecting portion 4 is movably provided on one side of the fixed plate 10, the fixed plate 10 and the first connecting plate 11 are horizontally arranged in parallel, two first lower chord tubes 12 and two first upper chord tubes 13 are each provided, and the two ends of the two first lower chord tubes 12 are respectively opposite to the fixed plate 10 and the first connecting plate 11 The two ends of the two first upper chord tubes 13 are respectively connected to the upper position of the side opposite to the fixing plate 10 and the first connecting plate 11. Several first abdominal tubes 14 are arranged in parallel between the two first lower chord tubes 12 and the two first upper chord tubes 13. Several second abdominal tubes 15 are evenly distributed between the two groups of first lower chord tubes 12 and first upper chord tubes 13 corresponding to the upper and lower positions. Both ends of the first lower chord tube 12 and the first upper chord tube 13 are provided with a butt joint 16. 13 is fixedly connected to the fixing plate 10 and the first connecting plate 11 through the butt joint 16 respectively; the inner sides of the ends of the first lower chord tube 12 and the first upper chord tube 13 are both provided with a latching key 160, and the butt joint 16 is provided with a key groove 161 at the position corresponding to the latching key 160, and the key groove 161 matches the latching key 160. By providing the butt joint 16, the first lower chord tube 12 and the first upper chord tube 13 are positioned more accurately during construction and installation, thereby improving the straightness of the base 1; a cavity is provided on the side wall of the butt joint 16 162, a threaded block 163 is movably arranged inside the cavity 162, a compression spring 1630 is arranged at the connection between the threaded block 163 and the cavity 162, and a tensioning screw 164 is arranged at the ends of the first lower chord tube 12 and the first upper chord tube 13 corresponding to the position of the threaded block 163. By arranging the threaded block 163 and the tensioning screw 164, the first lower chord tube 12 and the first upper chord tube 13 can maintain a stable state after docking with the docking head 16, which is beneficial to the welding reinforcement of the first lower chord tube 12 and the first upper chord tube 13;

[0044] like Figure 2 , 3 As shown, the conversion part 2 includes a second connecting plate 20, a second lower chord tube 21, a second upper chord tube 22 and a third connecting plate 23; the second connecting plate 20 and the third connecting plate 23 are arranged horizontally in parallel, the second connecting plate 20 is fixed to the first connecting plate 11 by bolts, two second lower chord tubes 21 and two second upper chord tubes 22 are provided, two ends of the two second lower chord tubes 21 are respectively connected to the lower position of the side opposite to the second connecting plate 20 and the third connecting plate 23, and two ends of the two second upper chord tubes 22 are respectively connected to the upper position of the side opposite to the second connecting plate 20 and the third connecting plate 23; a plurality of third belly tubes 24 are arranged in parallel between the two second lower chord tubes 21 and the two second upper chord tubes 22, and a plurality of fourth belly tubes 25 are evenly distributed between the two groups of second lower chord tubes 21 and second upper chord tubes 22 corresponding to the upper and lower positions;

[0045] like Figure 2 , 3 As shown in 4, the extension part 3 includes a fourth connecting plate 30, a third lower chord tube 31, a third upper chord tube 32 and an end plate 33, the fourth connecting plate 30 is fixed to the third connecting plate 23 by bolts, the fourth connecting plate 30 and the end plate 33 are arranged horizontally in parallel, two third lower chord tubes 31 are provided, and the two ends of the two third lower chord tubes 31 are respectively connected to the lower position of the side opposite to the fourth connecting plate 30 and the end plate 33, and one third upper chord tube 32 is provided, and the two ends of the third upper chord tube 32 are respectively connected to the upper position of the side opposite to the fourth connecting plate 30 and the end plate 33, and several fifth abdominal tubes 34 are arranged in parallel between the two third lower chord tubes 31, and several sixth abdominal tubes 35 are evenly distributed between the third upper chord tube 32 and the two third lower chord tubes 31; after the base 1, the conversion part 2 and the extension part 3 are connected, the end is connected to the guide rail 36 by bolts; the first connecting plate 11. The second connecting plate 20, the third connecting plate 23 and the fourth connecting plate 30 are all penetrated by a reinforcement sleeve 5. After the second connecting plate 20 is connected to the first connecting plate 11, and the fourth connecting plate 30 is connected to the third connecting plate 23, a reinforcement rod 50 is inserted between two adjacent reinforcement sleeves 5, and the reinforcement sleeve 5 and the reinforcement rod 50 are fixedly connected by bolts. By arranging the reinforcement sleeve 5 and the reinforcement rod 50, the connection between the base 1, the conversion part 2 and the extension part 3 is made more stable and reliable; the connection between the reinforcement sleeve 5 and the first connecting plate 11, the second connecting plate 20, the third connecting plate 23 and the fourth connecting plate 30 is provided with a reinforcing rib plate 51. By arranging the reinforcing rib 51, the reliability of the connection between the reinforcement sleeve 5 and the first connecting plate 11, the second connecting plate 20, the third connecting plate 23 and the fourth connecting plate 30 can be improved, thereby improving the stability of the crane arm during lateral swing.

[0046] Example 3

[0047] like Figure 1 , 2, 3, a heavy tower crane boom structure based on an improved steel pipe, comprising a base 1, a conversion portion 2 and an extension portion 3; the base 1 comprises a fixed plate 10, a first connecting plate 11, a first lower chord tube 12 and a first upper chord tube 13; a connecting portion 4 is movably provided on one side of the fixed plate 10, the fixed plate 10 and the first connecting plate 11 are horizontally arranged in parallel, two first lower chord tubes 12 and two first upper chord tubes 13 are each provided with, the two ends of the two first lower chord tubes 12 are respectively connected to the lower position of the side opposite to the fixed plate 10 and the first connecting plate 11, and the two first upper chord tubes 13 are respectively connected to the lower position of the side opposite to the fixed plate 10 and the first connecting plate 11, and the two first upper chord tubes 13 are respectively connected to the fixed plate 10 and the first connecting plate 11. The two ends of the tube 13 are respectively connected to the upper position of the side opposite to the fixing plate 10 and the first connecting plate 11. Several first abdominal tubes 14 are arranged in parallel between the two first lower chord tubes 12 and the two first upper chord tubes 13. Several second abdominal tubes 15 are evenly distributed between the two groups of first lower chord tubes 12 and first upper chord tubes 13 corresponding to the upper and lower positions. The second abdominal tubes 15 located at the front and rear ends of the base 1 are parallel to each other and staggered. By arranging the staggered second abdominal tubes 15, it is beneficial to improve the shear resistance in all directions of the base 1.

[0048] like Figure 2 , 3 As shown in , 4, the conversion part 2 includes a second connecting plate 20, a second lower chord tube 21, a second upper chord tube 22 and a third connecting plate 23; the second connecting plate 20 and the third connecting plate 23 are arranged horizontally in parallel, the second connecting plate 20 is fixed to the first connecting plate 11 by bolts, and two second lower chord tubes 21 and two second upper chord tubes 22 are each provided with two, and the two ends of the two second lower chord tubes 21 are respectively connected to the lower position of the side opposite to the second connecting plate 20 and the third connecting plate 23, and the two ends of the two second upper chord tubes 22 are respectively connected to the upper position of the side opposite to the second connecting plate 20 and the third connecting plate 23; a plurality of third abdominal tubes 24 are arranged in parallel between the two second lower chord tubes 21 and the two second upper chord tubes 22, and a plurality of fourth abdominal tubes 25 are evenly distributed between the two groups of second lower chord tubes 21 and the second upper chord tubes 22 corresponding to the upper and lower positions; the longitudinal sections of the fixing plate 10, the first connecting plate 11 and the second connecting plate 20 are all regular quadrilaterals, and the sizes of the fixing plate 10, the first connecting plate 11 and the second connecting plate 20 are the same;

[0049] like Figure 2 , 3As shown in , 4 and 7, the extension portion 3 includes a fourth connecting plate 30, a third lower chord tube 31, a third upper chord tube 32 and an end plate 33. The fourth connecting plate 30 is fixed to the third connecting plate 23 by bolts. The fourth connecting plate 30 and the end plate 33 are arranged horizontally in parallel. Two third lower chord tubes 31 are provided. The two ends of the two third lower chord tubes 31 are respectively connected to the lower position of the side opposite to the fourth connecting plate 30 and the end plate 33. One third upper chord tube 32 is provided. The two ends of the third upper chord tube 32 are respectively connected to the upper position of the side opposite to the fourth connecting plate 30 and the end plate 33. Several fifth abdominal tubes 34 are arranged in parallel between the two third lower chord tubes 31. The third upper chord tube 32 is connected to Several sixth belly tubes 35 are evenly distributed between the two third lower chord tubes 31; after the base 1, the conversion part 2 and the extension part 3 are connected, the ends are connected with guide rails 36 by bolts; the longitudinal sections of the third connecting plate 23, the fourth connecting plate 30 and the end plate 33 are all regular triangles, and the sizes of the third connecting plate 23, the fourth connecting plate 30 and the end plate 33 are successively reduced, and the lower ends of the fixed plate 10, the first connecting plate 11, the second connecting plate 20, the third connecting plate 23, the fourth connecting plate 30 and the end plate 33 are all provided with folding plates 360, and the guide rails 36 are fixedly connected to each folding plate 360 ​​by bolts. By providing the folding plates 360, the connection between the guide rails 36 and the boom is more reliable;

[0050] like Figure 2 , 8 As shown in Figures 9 and 10, a connection portion 4 is movably provided on one side of the fixed plate 10, and a buffer assembly 6 is provided at the connection portion. The buffer assembly 6 includes a plug sleeve 60 and a plug rod 61. The plug sleeve 60 is fixedly provided on the connection portion 4. Sliding grooves 600 are provided on both the front and rear sides of the inner wall of the plug sleeve 60. The plug rod 61 is fixedly provided on one side of the fixed plate 10. Buffer seats 610 are provided on both the front and rear sides of the outer wall of the plug rod 61. The two buffer seats 610 are respectively movably connected to the inside of the two sliding grooves 600; inside the two sliding grooves 600 and on both sides of the two buffer seats 610, two engaging blocks 601 are symmetrically provided. The ends of the two engaging blocks 601 that are away from each other are respectively abutted against the sliding groove 600 through the first buffer spring 602. When the boom swings laterally, the buffer seat 61 0 pressurizes the engaging blocks 601 at the corresponding positions, and uses the first buffer spring 602 to buffer the lateral swing of the boom, so as to avoid damage to the tower base during the swing of the boom, which is beneficial to improving the safety of the heavy tower crane; the upper and lower sides of each engaging block 601 are connected with a sliding sleeve 604 through a pushing rod 603, and a sliding rod 605 is arranged inside the sliding groove 600 at the corresponding position of each sliding sleeve 604, and the sliding sleeve 604 is movably sleeved on the sliding rod 605; the sliding rod 605 and the two sides of the sliding sleeve 604 are provided with a second buffer spring 606, when the engaging block 601 moves, the sliding sleeve 604 is pushed to move on the sliding rod 605, and the second buffer spring 606 is used to perform secondary buffering on the lateral swing of the boom.

[0051] Example 4

[0052] like Figure 1 , 2 , 3, 5, and 6 show a heavy tower crane boom structure based on an improved steel pipe, comprising a base 1, a conversion portion 2, and an extension portion 3; the base 1 comprises a fixed plate 10, a first connecting plate 11, a first lower chord tube 12, and a first upper chord tube 13; a connecting portion 4 is movably provided on one side of the fixed plate 10, the fixed plate 10 and the first connecting plate 11 are horizontally arranged in parallel, two first lower chord tubes 12 and two first upper chord tubes 13 are each provided, the two ends of the two first lower chord tubes 12 are respectively connected to the lower position of the side opposite to the fixed plate 10 and the first connecting plate 11, and the two first upper chord tubes 1 The two ends of the base 1 are respectively connected to the upper position of the side opposite to the fixing plate 10 and the first connecting plate 11, and a plurality of first ventral tubes 14 are arranged in parallel between the two first lower chord tubes 12 and the two first upper chord tubes 13. A plurality of second ventral tubes 15 are evenly distributed between the first lower chord tubes 12 and the first upper chord tubes 13 corresponding to the two groups of upper and lower positions. The second ventral tubes 15 located at the front and rear ends of the base 1 are parallel to each other and staggered. By arranging the staggered second ventral tubes 15, it is beneficial to improve the shear resistance in all directions of the base 1; the first lower chord tubes 12 Both ends of the first upper chord tube 13 are provided with docking joints 16, and the first lower chord tube 12 and the first upper chord tube 13 are fixedly connected to the fixing plate 10 and the first connecting plate 11 through the docking joints 16 respectively; the inner sides of the ends of the first lower chord tube 12 and the first upper chord tube 13 are provided with a positioning key 160, and the docking joint 16 is provided with a key groove 161 at the position corresponding to the position of the positioning key 160, and the key groove 161 matches the positioning key 160. By providing the docking joint 16, the first lower chord tube 12 and the first upper chord tube 13 are more accurately positioned during construction and installation, thereby improving the base 1 Straightness; a cavity 162 is provided on the side wall of the joint 16, a threaded block 163 is movably provided inside the cavity 162, a compression spring 1630 is provided at the connection between the threaded block 163 and the cavity 162, and a tightening screw 164 is provided at the ends of the first lower chord tube 12 and the first upper chord tube 13 corresponding to the position of the threaded block 163. By providing the threaded block 163 and the tightening screw 164, the first lower chord tube 12 and the first upper chord tube 13 can maintain a stable state after being docked with the joint 16, which is beneficial to the welding reinforcement of the first lower chord tube 12 and the first upper chord tube 13;

[0053] like Figure 2 , 34, the conversion portion 2 includes a second connecting plate 20, a second lower chord tube 21, a second upper chord tube 22 and a third connecting plate 23; the longitudinal sections of the fixed plate 10, the first connecting plate 11 and the second connecting plate 20 are all regular quadrilaterals, and the fixed plate 10, the first connecting plate 11 and the second connecting plate 20 have the same size; the second connecting plate 20 and the third connecting plate 23 are arranged horizontally in parallel, the second connecting plate 20 is fixed to the first connecting plate 11 by bolts, and two second lower chord tubes 21 and two second upper chord tubes 22 are each provided with two, the two ends of the two second lower chord tubes 21 are respectively connected to the lower position of the side opposite to the second connecting plate 20 and the third connecting plate 23, and the two ends of the two second upper chord tubes 22 are respectively connected to the upper position of the side opposite to the second connecting plate 20 and the third connecting plate 23; a plurality of third abdominal tubes 24 are arranged in parallel between the two second lower chord tubes 21 and between the two second upper chord tubes 22, and the two groups of second lower chord tubes 21 corresponding to the upper and lower positions are provided. Several fourth belly tubes 25 are evenly distributed between the first connecting plate 11, the second connecting plate 20, the third connecting plate 23 and the fourth connecting plate 30; a reinforcement sleeve 5 is penetrated through the first connecting plate 11, the second connecting plate 20, the third connecting plate 23 and the fourth connecting plate 30. After the second connecting plate 20 is connected to the first connecting plate 11, and the fourth connecting plate 30 is connected to the third connecting plate 23, a reinforcement rod 50 is inserted between two adjacent reinforcement sleeves 5, and the reinforcement sleeve 5 and the reinforcement rod 50 are fixedly connected by bolts. By arranging the reinforcement sleeve 5 and the reinforcement rod 50, the connection between the base 1, the conversion part 2 and the extension part 3 is more stable and reliable; reinforcing rib plates 51 are arranged at the connection between the reinforcement sleeve 5 and the first connecting plate 11, the second connecting plate 20, the third connecting plate 23 and the fourth connecting plate 30. By arranging the reinforcement ribs 51, the reliability of the connection between the reinforcement sleeve 5 and the first connecting plate 11, the second connecting plate 20, the third connecting plate 23 and the fourth connecting plate 30 can be improved, thereby improving the stability of the crane arm during lateral swing;

[0054] like Figure 2 , 3As shown in , 4 and 7, the extension portion 3 includes a fourth connecting plate 30, a third lower chord tube 31, a third upper chord tube 32 and an end plate 33. The longitudinal sections of the third connecting plate 23, the fourth connecting plate 30 and the end plate 33 are all equilateral triangles. The sizes of the third connecting plate 23, the fourth connecting plate 30 and the end plate 33 are successively reduced. The fourth connecting plate 30 is fixed to the third connecting plate 23 by bolts. The fourth connecting plate 30 and the end plate 33 are horizontally arranged in parallel. Two third lower chord tubes 31 are provided. The two ends of the two third lower chord tubes 31 are respectively connected to the lower position of the side opposite to the fourth connecting plate 30 and the end plate 33. One third upper chord tube 32 is provided. The two ends of the third upper chord tube 32 are respectively connected to the lower position of the side opposite to the fourth connecting plate 30 and the end plate 33. The first connecting plate 10, the second connecting plate 20, the third connecting plate 23, the fourth connecting plate 30 and the end plate 33 are connected to the upper position of the side opposite to the fourth connecting plate 30 and the end plate 33, several fifth belly tubes 34 are arranged in parallel between the two third lower chord tubes 31, and several sixth belly tubes 35 are evenly distributed between the third upper chord tube 32 and the two third lower chord tubes 31; after the base 1, the conversion part 2 and the extension part 3 are connected, the end is connected with a guide rail 36 by bolts; the lower ends of the fixing plate 10, the first connecting plate 11, the second connecting plate 20, the third connecting plate 23, the fourth connecting plate 30 and the end plate 33 are all provided with folding plates 360, and the guide rail 36 is fixedly connected to each folding plate 360 ​​by bolts. By providing the folding plate 360, the connection between the guide rail 36 and the crane arm is more reliable.

[0055] like Figure 2 , 8 As shown in Figures 9 and 10, a connection portion 4 is movably provided on one side of the fixed plate 10, and a buffer assembly 6 is provided at the connection portion. The buffer assembly 6 includes a plug sleeve 60 and a plug rod 61. The plug sleeve 60 is fixedly provided on the connection portion 4. Sliding grooves 600 are provided on both the front and rear sides of the inner wall of the plug sleeve 60. The plug rod 61 is fixedly provided on one side of the fixed plate 10. Buffer seats 610 are provided on both the front and rear sides of the outer wall of the plug rod 61. The two buffer seats 610 are respectively movably connected to the inside of the two sliding grooves 600; inside the two sliding grooves 600 and on both sides of the two buffer seats 610, two engaging blocks 601 are symmetrically provided. The ends of the two engaging blocks 601 that are away from each other are respectively abutted against the sliding groove 600 through the first buffer spring 602. When the boom swings laterally, the buffer seat 61 0 pressurizes the engaging blocks 601 at the corresponding positions, and uses the first buffer spring 602 to buffer the lateral swing of the boom, so as to avoid damage to the tower base during the swing of the boom, which is beneficial to improving the safety of the heavy tower crane; the upper and lower sides of each engaging block 601 are connected with a sliding sleeve 604 through a pushing rod 603, and a sliding rod 605 is arranged inside the sliding groove 600 at the corresponding position of each sliding sleeve 604, and the sliding sleeve 604 is movably sleeved on the sliding rod 605; the sliding rod 605 and the two sides of the sliding sleeve 604 are provided with a second buffer spring 606, when the engaging block 601 moves, the sliding sleeve 604 is pushed to move on the sliding rod 605, and the second buffer spring 606 is used to perform secondary buffering on the lateral swing of the boom.

Claims

1. A heavy tower crane boom structure based on improved steel pipe, characterized in that: It comprises a base, a conversion part and an extension part; the base comprises a fixing plate, a first connecting plate, a first lower chord tube and a first upper chord tube; a connecting part is movably arranged on one side of the fixing plate, the fixing plate and the first connecting plate are arranged horizontally in parallel, two of the first lower chord tube and two of the first upper chord tube are arranged, two ends of the two first lower chord tubes are respectively connected to the lower position of the side opposite to the fixing plate and the first connecting plate, two ends of the two first upper chord tubes are respectively connected to the upper position of the side opposite to the fixing plate and the first connecting plate, several first belly tubes are arranged in parallel between the two first lower chord tubes and between the two first upper chord tubes, and several second belly tubes are evenly distributed between the two groups of first lower chord tubes and first upper chord tubes corresponding to the upper and lower positions; Both ends of the first lower chord tube and the first upper chord tube are provided with docking joints, and the first lower chord tube and the first upper chord tube are respectively fixedly connected to the fixing plate and the first connecting plate through the docking joints; the inner sides of the ends of the first lower chord tube and the first upper chord tube are provided with positioning keys, and key grooves are provided on the docking joints at positions corresponding to the positioning keys, and the key grooves match the positioning keys; A cavity is provided on the side wall of the butt joint, a threaded block is movably provided inside the cavity, a compression spring is provided at the connection between the threaded block and the cavity, and tightening screws are provided at the ends of the first lower chord tube and the first upper chord tube at positions corresponding to the threaded block; A connecting part is movably provided on one side of the fixed plate, and a buffer assembly is provided at the connection part, the buffer assembly includes a plug-in sleeve and a plug-in rod, the plug-in sleeve is fixedly provided on the connecting part, and sliding grooves are provided on the front and rear sides of the inner wall of the plug-in sleeve, the plug-in rod is fixedly provided on one side of the fixed plate, and buffer seats are provided on the front and rear sides of the outer wall of the plug-in rod, and the two buffer seats are movably clamped in the two sliding grooves respectively; inside the two sliding grooves, and on both sides of the two buffer seats, two engaging blocks are symmetrically provided, and the ends of the two engaging blocks away from each other are respectively abutted against the sliding grooves through first buffer springs.

2. A heavy tower crane boom structure based on improved steel pipe according to claim 1, characterized in that: The conversion part includes a second connecting plate, a second lower chord tube, a second upper chord tube and a third connecting plate; the second connecting plate and the third connecting plate are arranged horizontally in parallel, the second connecting plate is fixed to the first connecting plate by bolts, two second lower chord tubes and two second upper chord tubes are each provided with, two ends of the two second lower chord tubes are respectively connected to the lower position of the side opposite to the second connecting plate and the third connecting plate, and two ends of the two second upper chord tubes are respectively connected to the upper position of the side opposite to the second connecting plate and the third connecting plate; several third belly tubes are arranged in parallel between the two second lower chord tubes and between the two second upper chord tubes, and several fourth belly tubes are evenly distributed between the two groups of second lower chord tubes and second upper chord tubes corresponding to the upper and lower positions.

3. A heavy tower crane boom structure based on improved steel pipe according to claim 2, characterized in that: The extension portion includes a fourth connecting plate, a third lower chord tube, a third upper chord tube and an end plate. The fourth connecting plate is fixed to the third connecting plate by bolts. The fourth connecting plate and the end plate are horizontally arranged in parallel. Two third lower chord tubes are provided. Two ends of the two third lower chord tubes are respectively connected to the lower position of the side opposite to the fourth connecting plate and the end plate. One third upper chord tube is provided. Two ends of the third upper chord tube are respectively connected to the upper position of the side opposite to the fourth connecting plate and the end plate. Several fifth abdominal tubes are arranged in parallel between the two third lower chord tubes. Several sixth abdominal tubes are evenly distributed between the third upper chord tube and the two third lower chord tubes. After the base, the conversion portion and the extension portion are connected, the end portion is connected to a guide rail by bolts.

4. A heavy tower crane boom structure based on improved steel pipe according to claim 3, characterized in that: The first connecting plate, the second connecting plate, the third connecting plate and the fourth connecting plate are all penetrated by a reinforcement sleeve. After the second connecting plate is connected to the first connecting plate and the fourth connecting plate is connected to the third connecting plate, a reinforcement rod is inserted between two adjacent reinforcement sleeves, and the reinforcement sleeve and the reinforcement rod are fixedly connected by bolts.

5. The heavy tower crane boom structure based on improved steel pipe according to claim 4 is characterized in that: Reinforcing ribs are provided at the connection points between the reinforcement sleeve and the first connection plate, the second connection plate, the third connection plate and the fourth connection plate.

6. The heavy tower crane boom structure based on improved steel pipe according to claim 1 is characterized in that: The second abdominal tubes located at the front and rear ends of the base are parallel to each other and staggered.

7. The heavy tower crane boom structure based on improved steel pipe according to claim 3 is characterized in that: The longitudinal sections of the fixed plate, the first connecting plate and the second connecting plate are all regular quadrilaterals, and the sizes of the fixed plate, the first connecting plate and the second connecting plate are the same; the longitudinal sections of the third connecting plate, the fourth connecting plate and the end plate are all regular triangles, and the sizes of the third connecting plate, the fourth connecting plate and the end plate decrease successively.

8. The heavy tower crane boom structure based on improved steel pipe according to claim 3 is characterized in that: The fixing plate, the first connecting plate, the second connecting plate, the third connecting plate, the fourth connecting plate and the lower ends of the end plate are all provided with folding plates, and the guide rails are fixedly connected to each folding plate by bolts.

9. The heavy tower crane boom structure based on improved steel pipe according to claim 4, characterized in that: The reinforcement sleeve is provided with a reinforcing rib plate.

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