阅读说明：本技术 上侧轻载荷单焊缝起重臂 (Upper side light load single welding seam crane boom ) 是由 姚运文 姚婧辉 于 2019-11-19 设计创作，主要内容包括：本发明涉及一种上侧轻载荷单焊缝起重臂,它包括内臂(1)和外臂(2),内臂(1)沿外臂(2)中空腔体的沿伸方向套装在外臂(2)内,内臂(1)和外臂(2)分别是由钢板折成的对接边位于上侧面中间位置的中空筒形体,内臂(1)和外臂(2)分别在上侧面中间的对接边位置焊接成整体。它强度高,重量轻,不容易开焊,使用可靠性高。它强度高,重量轻,不容易开焊,使用可靠性高。它只在起重臂的上侧面中间位置设有一道焊缝,使起重臂形成在上侧面中间位置相焊接的整体结构,焊缝上的承载力大大减少,从而避免了因焊缝承载开焊的问题,直接提高了起重臂的安全可靠性。(The invention relates to upper side light load single weld seam crane booms, which comprise an inner boom (1) and an outer boom (2), wherein the inner boom (1) is sleeved in the outer boom (2) along the extension direction of a hollow cavity of the outer boom (2), the inner boom (1) and the outer boom (2) are hollow cylindrical bodies with butt joint edges formed by folding steel plates and positioned in the middle of the upper side, and the inner boom (1) and the outer boom (2) are respectively welded into a whole at the butt joint edge position in the middle of the upper side.)

1. Upside light load list welding seam jib loading boom, it includes inner boom (1) and outer boom (2), inner boom (1) is along the direction suit of stretching in outer boom (2) cavity in outer boom (2), two upper corner positions of inner boom (1) rear end portion are equipped with respectively with two interior angle position looks sliding fit's of outer boom (2) upside wear-resisting piece (3) that slide, be equipped with on the downside inner wall of outer boom (2) front end portion with the downside outer wall looks sliding fit's of inner boom (1) wear-resisting piece (4) that slide down, its characterized in that: the inner arm (1) and the outer arm (2) are hollow cylindrical bodies with butt joint edges formed by folding steel plates and located in the middle of the upper side surface, and the inner arm (1) and the outer arm (2) are welded into a whole in the butt joint edge position in the middle of the upper side surface.

2. The upper side light load single weld crane boom according to claim 1, characterized in that the butt edges of the inner boom (1) and the outer boom (2) are arranged in the middle of the upper sides of the inner boom (1) and the outer boom (2), respectively.

3. The upper side light load single weld crane boom according to claim 1, characterized in that the butt joint edge positions of the inner boom (1) and the outer boom (2) are respectively provided with a welding groove, and the transverse section of the part of the welding seam protruding out of the upper surfaces of the inner boom (1) and the outer boom (2) is a small semicircle.

4. The upper-side light-load single-weld crane boom according to claim 1, characterized in that the middle positions of the lower sides of the inner arm (1) and the outer arm (2) are planes (5) extending along the cavity direction of the inner arm (1), the positions of both sides of the planes (5) are respectively folded upwards to form a slope (6) which is connected with the planes (5) and has a low side and a high side , the edges of both slopes (6) far away from the planes (5) are folded upwards to form a left vertical surface (7) and a right vertical surface (7) which are perpendicular to the planes (5) and are parallel to each other, the opposite positions of the upper sides of both vertical surfaces (7) are oppositely bent to form a 90-degree circular arc, the edges are relatively welded, the surfaces of both upper sliding wear-resistant blocks (3) and both inner corners of the upper side of the outer arm (2) are 90-degree circular arcs, and the sides of both slopes (6) far away from the planes (5) on the inner walls of the front end.

5. The upper side light load single weld seam jib crane boom according to claim 1, characterized in that the lower side surfaces of the inner arm (1) and the outer arm (2) are 180 degree arc surfaces (8) axially extending along the extension direction of the cavity of the inner arm (1), the side parts at both sides of the 180 degree arc surfaces (8) are parallel and extended upwards to form a left vertical surface and a right vertical surface (7), the upper sides of the two vertical surfaces (7) are oppositely bent in 90 degree arc shape, the side parts are oppositely welded, the surfaces of the upper sliding wear-resistant blocks (3) matched with the two inner angles at the upper side of the outer arm (2) are 90 degree arc surfaces, the high points at both sides of the 180 degree arc surface (8) at the front end of the outer arm (2) are respectively provided with lower sliding wear-resistant blocks (4), or lower sliding wear-resistant blocks (4) with an integral structure are arranged on the 180 degree arc surface (8) at the front end of the outer.

6. The upper side light load single-weld crane boom according to claim 1, characterized in that the lower side surfaces of the inner arm (1) and the outer arm (2) are 180-degree arc surfaces (8) axially extending along the cavity of the inner arm (1), the edges of both sides of the 180-degree arc surfaces (8) extend upwards in parallel to form two left and right vertical surfaces (7) of the inner arm (1), the opposite positions of the upper sides of the two vertical surfaces (7) are bent towards a right angle, the edges are welded to each other, the surfaces of the upper sliding wear-resistant blocks (3) matched with the two inner angles of the upper side of the outer arm (2) are right-angle surfaces, lower sliding wear-resistant blocks (4) are respectively arranged at the high points of both sides of the 180-degree arc surface (8) at the front end of the outer arm (2), or lower sliding wear-resistant blocks (4) of an integral structure are arranged on the 180-degree arc surface (8) at the front end of.

7. The upper-side light-load single-weld crane boom as claimed in claim 1, wherein the middle positions of the lower side surfaces of the inner boom (1) and the outer boom (2) are folded downwards, two sides form slopes (6) with low folded positions and high opposite side positions, the high sides of the two slopes (6) are respectively extended upwards in parallel to form a left vertical surface and a right vertical surface (7), the opposite positions of the upper sides of the two vertical surfaces (7) are bent in 90-degree circular arc shape, the sides are welded and connected oppositely, the surfaces of the upper sliding wear-resistant blocks (3) and the two inner corners of the upper side of the outer boom (2) are 90-degree circular arc surfaces, and lower sliding wear-resistant blocks (4) are respectively arranged at the high positions of the two slopes (6) on the inner wall of the front end of the outer boom (.

8. The upper-side light-load single-weld crane boom as claimed in claim 1, wherein the middle positions of the lower sides of the inner boom (1) and the outer boom (2) are folded downwards, two sides of the lower sides form slopes (6) with low folded positions and high opposite side positions, the high sides of the two slopes (6) are respectively extended upwards in parallel to form a left vertical surface and a right vertical surface (7), the opposite positions of the upper sides of the two vertical surfaces (7) are bent towards a right angle, the sides are welded and connected oppositely, the surfaces of the upper sliding wear-resistant blocks (3) matched with the two inner angles of the upper side of the outer boom (2) are right-angled surfaces, and lower sliding wear-resistant blocks (4) are respectively arranged at the high positions of the two slopes (6) on the inner wall of the front end of.

Technical Field

The invention relates to a hoisting device, in particular to an crane arm.

Background

The crane boom is a key part of the crane, in order to improve the lifting capacity, a crane manufacturer needs to adopt various methods to reduce the weight of the crane boom, but the strength of the crane boom cannot be reduced on the premise of reducing the weight of the crane boom, so practical and reasonable improvement needs to be carried out on the crane boom structure. Most of crane booms of the existing cranes are processed by adopting a corner welding mode, the welding seams of the crane booms are mostly arranged at the corner positions of the crane booms, the stress of the welding seams is large, the tensile strength and the compressive strength are both smaller than those of other non-welding positions of the crane booms, and the strength of the crane booms is seriously influenced. Therefore, the crane arm with multiple welding seams is easy to open and weld in the using process to cause accidents, and is not safe and reliable enough to use.

Disclosure of Invention

The invention aims to provide crane arms with high strength, light weight, difficult welding and safe and reliable use and with light load on the upper side and single welding seam.

The technical solution of the invention is as follows: the inner arm is sleeved in the outer arm along the extending direction of the cavity of the outer arm, two upper corner positions of the rear end part of the inner arm are respectively provided with an upper sliding wear-resistant block in sliding fit with two inner corner positions of the upper side of the outer arm, a lower sliding wear-resistant block in sliding fit with the outer wall of the lower side of the inner arm is arranged on the inner wall of the lower side of the front end part of the outer arm, the inner arm and the outer arm are respectively hollow cylindrical bodies with butt joint edges folded by steel plates located at the middle positions of the upper side, and the inner arm and the outer arm are respectively welded into a whole at the butt joint edge positions in the middle of the upper side.

The invention has the technical effects that the strength is high, the weight is light, the welding is not easy to open, the use reliability is high, only welding seams are arranged at the middle position of the upper side surface of the crane boom, so that the crane boom forms an integral structure welded at the middle position of the upper side surface, the bearing capacity on the welding seams is greatly reduced, the problem of opening welding caused by bearing of the welding seams is avoided, and the safety and the reliability of the crane boom are directly improved.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a third embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of an embodiment of the present invention;

fig. 5 is a schematic cross-sectional structure diagram of an embodiment of the invention.

Detailed Description