A foldable crane A-frame

Abstract

The present invention discloses a foldable crane A-frame, wherein the ends of the folding arm upper arm and the folding arm lower arm are connected by a link pin, the folding arm upper arm is connected to the top of the non-folding arm by the non-folding arm upper pin shaft, the folding arm upper arm, the folding arm lower arm and the non-folding arm form an A-shaped bracket, and a hydraulic oil cylinder is provided on the folding arm upper arm and the folding arm lower arm, the hydraulic oil cylinder is straddled on the link pin, one end is fixedly connected to the folding arm lower arm, and the other end is movably connected to the folding arm upper arm. The device of the present invention forms an A-shaped bracket with the folding arm upper arm, the lower part and the non-folding arm, and the A-shaped bracket can be lowered and pulled up by folding the folding arm upper arm and the folding arm lower arm; a hydraulic oil cylinder is provided between the folding arm upper arm and the folding arm lower arm, and the folding control of the folding arm upper arm and the lower part is realized by the extension and retraction of the hydraulic oil cylinder, and the operation is convenient; the A-shaped bracket is automatically folded by the linkage use of the variable amplitude hoisting mechanism, the variable amplitude steel wire and the hydraulic oil cylinder.

Description

Technical Field

[0001] The present invention relates to the field of cranes, in particular to a foldable A-frame of a crane. Background Art

[0002] With the increase in bridges over waterways, height restrictions above waterways have led to an increasing number of large cranes adopting folding A-frames. However, the lowering and raising of folding A-frames mostly require manual labor and auxiliary mechanisms and cannot be automated. Folding and raising them take a long time. Summary of the Invention

[0003] The purpose of the present invention is to provide a foldable crane A-frame, which can be automatically folded down and pulled up, making the operation more convenient.

[0004] The technical solution adopted in the present invention is:

[0005] A foldable A-frame crane comprises a folding arm upper arm, a folding arm lower arm, a non-folding arm, a hydraulic cylinder, and a luffing winch mechanism. The ends of the folding arm upper arm and the folding arm lower arm are connected by a linking pin, and the folding arm upper arm is connected to the top of the non-folding arm by the upper pin shaft of the non-folding arm. The folding arm upper arm, the folding arm lower arm, and the non-folding arm form an A-shaped bracket. A hydraulic cylinder is provided on the folding arm upper arm and the folding arm lower arm. The hydraulic cylinder is straddled on the linking pin, one end of the hydraulic cylinder is fixedly connected to the folding arm lower arm, and the other end is movably connected to the folding arm upper arm. The outer end of the piston rod on the hydraulic cylinder is connected to a latch slider, and the latch slider is fixed in a fixing hole on the folding arm upper arm by a hydraulic latch.

[0006] Furthermore, two fixing holes are provided on the upper arm of the folding arm, the fixing hole I is close to the lower arm of the folding arm, and the fixing hole II is far away from the lower arm of the folding arm.

[0007] Furthermore, when the latch slider is fixed in the fixing hole II, the piston rod in the hydraulic cylinder is fully extended, and when the latch slider is fixed in the fixing hole I, the piston rod in the hydraulic cylinder is fully retracted.

[0008] Furthermore, a folding arm stopper is provided at the connection between the upper arm of the folding arm and the lower arm of the folding arm, which is arranged opposite to the hydraulic cylinder. It includes two stops respectively provided on the upper arm of the folding arm and the lower arm of the folding arm. When the upper arm of the folding arm and the lower arm of the folding arm are in the working state of the crane, the two stops are connected to maintain the rigidity of the folding arm, so that the A-frame meets the maximum rated lifting load requirements.

[0009] Furthermore, a luffing winch mechanism is fixed on the non-folding arm, and an A-frame pulley is provided on the top of the non-folding arm. The luffing steel wire released from the luffing winch mechanism passes through the A-frame pulley, bypasses the boom pulley on the top of the boom, and is connected and fixed to the upper fixed point of the non-folding arm.

[0010] Furthermore, the folding arm lower arm rotates around the folding arm lower arm pin at the bottom end, the non-folding arm rotates around the non-folding arm lower pin at the bottom end, and the lifting arm rotates around the lifting arm pin at the bottom end.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The device of the present invention comprises an A-shaped support formed by the upper and lower folding arms. By folding the upper and lower folding arms, the center of gravity of the A-shaped support is tilted backward when the folding arm is lowered and raised. When the boom passes through a height-restricted bridge, the A-shaped support can be quickly lowered and raised.

[0013] 2. The device of the present invention is provided with a hydraulic cylinder between the upper arm of the folding arm and the lower arm of the folding arm. The upper arm of the folding arm and the lower arm of the folding arm are folded and controlled by the extension and contraction of the hydraulic cylinder, which is convenient to operate.

[0014] 3. The A-shaped bracket of the device of the present invention is used in conjunction with the luffing winch mechanism, the luffing wire, and the hydraulic cylinder. The laying down and pulling up operations do not require the assistance of manual labor and auxiliary mechanisms, and automatic folding is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a usage state diagram of the present invention;

[0017] Figure 2 A diagram showing the position of the crane arm being lowered according to the present invention;

[0018] Figure 3 This is a structural diagram of the A-shaped frame of the present invention when it is folded down to the middle position;

[0019] Figure 4 This is a structural diagram of the A-shaped frame of the present invention being completely folded down;

[0020] Figure 5 This is a structural diagram of the folding arm latch slider of the present invention being fixed to the fixing hole I;

[0021] Figure 6 This is a structural diagram of the folding arm latch slider of the present invention being fixed to the fixing hole II;

[0022] Figure 7 is a schematic diagram of the folding process of the folding arm of the present invention;

[0023] Figure 8 This is a schematic diagram of the folding arm of the present invention after folding.

[0024] Among them: 1. Folding arm lower arm pin; 2. Non-folding arm lower pin; 3. Lifting arm pin; 4. Lifting arm; 5. Lifting arm pulley; 6. A-frame pulley; 7. Fixing point; 8. Non-folding arm upper pin; 9. Luffing winch mechanism; 10. Folding arm upper arm; 11. Folding arm lower arm; 12. Non-folding arm; 13. Luffing wire; 14. Hydraulic cylinder; 15. Fixing hole I; 16. Fixing hole II; 17. Piston rod; 18. Hydraulic latch; 19. Folding arm stopper; 20. Latch slider; 21. Connecting pin. DETAILED DESCRIPTION

[0025] like Figure 1-8 As shown, a foldable crane A-frame includes a folding arm upper arm 10, a folding arm lower arm 11, a non-folding arm 12, a hydraulic cylinder 14, and a luffing winch mechanism 9. The ends of the folding arm upper arm 10 and the folding arm lower arm 11 are connected by a link pin 21, and the folding arm upper arm 10 and the top of the non-folding arm 12 are connected by the non-folding arm upper pin 8. The folding arm upper arm 10, the folding arm lower arm 11 and the non-folding arm 12 form an A-shaped bracket and form a stable triangle with the bottom crane turntable. A hydraulic cylinder 14 is provided on the folding arm upper arm 10 and the folding arm lower arm 11. The hydraulic cylinder 14 is straddled on the link pin 21, one end is fixedly connected to the folding arm lower arm 11, and the other end is movably connected to the folding arm upper arm 10, and a piston rod 17 is connected to the hydraulic cylinder 14. The outer end of the piston rod 17 is connected to the latch slider 20, and the latch slider 20 is fixed in the fixing hole on the folding arm upper arm 10 by the hydraulic latch 18. The upper part of the folding arm, the lower part of the folding arm and the non-folding arm of the device of the present invention form an A-shaped bracket. Through the folding operation of the upper part and the lower part of the folding arm, the center of gravity of the A-shaped bracket is tilted backward when lowering and pulling up. When the lifting arm passes through a height-restricted bridge, the A-shaped bracket can be quickly lowered and pulled up; a hydraulic cylinder is arranged between the upper arm of the folding arm and the lower arm of the folding arm, and the upper arm of the folding arm and the lower arm of the folding arm are folded and controlled by the extension and retraction of the hydraulic cylinder, which is convenient to operate.

[0026] Folding arm upper arm 10 is provided with two fixing holes: fixing hole I 15 located near folding arm lower arm 11 and fixing hole II 16 located further away from folding arm lower arm 11. When latch slider 20 is secured in fixing hole II 16, piston rod 17 in hydraulic cylinder 14 is fully extended. When latch slider 20 is secured in fixing hole I 15, piston rod 17 in hydraulic cylinder 14 is fully retracted.

[0027] A folding arm stopper 19 is provided at the connection between the folding arm upper arm 10 and the folding arm lower arm 11, which is arranged opposite to the hydraulic cylinder 14, and includes two stops respectively provided on the folding arm upper arm 10 and the folding arm lower arm 11. When the folding arm upper arm 10 and the folding arm lower arm 11 are in the working state of the crane, the two stops are connected, and the folding arm upper arm 10 and the folding arm lower arm 11 act together through the hydraulic cylinder 14 and the folding arm stopper 19 on the opposite folding arm to ensure that the rigidity of the folding arm in the working state will not rotate around the pin shaft thereon, so that the A-frame meets the maximum rated lifting load requirements.

[0028] A luffing winch mechanism 9 is fixed to the non-folding arm 12, and an A-frame pulley 6 is installed at the top of the non-folding arm 12. The luffing wire 13 released from the luffing winch mechanism 9 passes through the A-frame pulley 6, bypasses the boom pulley 5 at the top of the boom 4, and is connected and fixed to the upper fixing point 7 of the non-folding arm 12. The A-shaped bracket is used in conjunction with the luffing winch mechanism 9, the luffing wire 13, and the hydraulic cylinder 14. The lowering and raising operations do not require manual assistance or auxiliary mechanisms, and the folding is achieved automatically.

[0029] The folding arm lower arm 11 rotates around the folding arm lower arm pin 1 at the bottom end, the non-folding arm 12 rotates around the non-folding arm lower pin 2 at the bottom end, and the lifting arm 4 rotates around the lifting arm pin 3 at the bottom end.

[0030] When the device is used and needs to be folded, the boom 4 is lowered (eg, Figure 2 As shown), pull out the hydraulic latch 18 on the latch slider 20 at the end of the piston rod 17 of the hydraulic cylinder 14 from the fixing hole Ⅰ 15, push the latch slider 20 to the fixing hole Ⅱ 16 under the action of hydraulic pressure, and insert the hydraulic latch 18 into the fixing hole Ⅱ 16 (as shown). Figure 5-6 Continue to start the luffing winch mechanism 9 to release the luffing wire 13, and the A-frame non-folding arm 12 rotates counterclockwise around the lower pin 2 of the non-folding arm and falls down (as shown). Figure 3 As shown in FIG), during the process of the non-folding arm 12 being folded down and raised, the hydraulic cylinder 14 on the folding arm only bears the load of folding and unfolding the folding arm, and the load of folding and lifting the non-folding arm 12 together with the folding arm is completely borne by the crane luffing mechanism; at the same time, the folding arm is folded around the non-folding arm upper arm pin 8, the folding arm lower arm pin 1 and the connecting pin 21 under the action of the hydraulic cylinder 14 until it is placed in the designed position (as shown in FIG). Figure 4 、 7, 8). When lifting is required, the luffing wire 13 is retracted via the luffing winch mechanism 9, causing the A-frame to rise under the action of the luffing wire 13. Once the A-frame is in place, the hydraulic latch 18 on the latch slide 20 at the end of the piston rod 17 of the hydraulic cylinder 14 is pulled out of the fixing hole II 16 and moved to the fixing hole I 15. The luffing winch mechanism 9 is activated to continue retracting the luffing wire 13, raising the boom 4, and the crane is in the working position. The folding and unfolding of the crane's A-frame are both completed sequentially by the control system, achieving a high degree of automation.

[0031] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should be included in the scope of protection determined by the claims of the present invention.

Claims

1. A foldable A-frame crane, comprising a folding upper arm, a folding lower arm, a non-folding arm, a hydraulic cylinder, and a luffing winch mechanism, characterized in that: The ends of the folding arm upper arm and the folding arm lower arm are connected by a linking pin, and the folding arm upper arm is connected to the top of the non-folding arm by the upper pin shaft of the non-folding arm. The folding arm upper arm, the folding arm lower arm and the non-folding arm form an A-shaped bracket. A hydraulic cylinder is provided on the folding arm upper arm and the folding arm lower arm. The hydraulic cylinder is straddled on the linking pin, one end is fixedly connected to the folding arm lower arm, and the other end is movably connected to the folding arm upper arm. The outer end of the piston rod on the hydraulic cylinder is connected to the latch slider, and the latch slider is fixed in the fixing hole on the folding arm upper arm through the hydraulic latch. Two fixing holes are provided on the folding arm upper arm, the fixing hole I is close to the folding arm lower arm, and the fixing hole II is away from the folding arm lower arm. When the latch slider is fixed to the fixing hole II, the piston rod in the hydraulic cylinder is fully extended. When the latch slider is fixed to the fixing hole I, the piston rod in the hydraulic cylinder is fully retracted.

2. The foldable A-frame crane according to claim 1, characterized in that: A folding arm stopper is provided at the connection between the folding arm upper arm and the folding arm lower arm, which is arranged opposite to the hydraulic cylinder. The folding arm stopper includes two stops respectively provided on the folding arm upper arm and the folding arm lower arm. When the folding arm upper arm and the folding arm lower arm are in the crane working state, the two stops are connected.

3. The foldable A-frame crane according to claim 1, characterized in that: A luffing winch mechanism is fixed on the non-folding arm, and an A-frame pulley is provided on the top of the non-folding arm. The luffing steel wire released from the luffing winch mechanism passes through the A-frame pulley, bypasses the boom pulley on the top of the boom, and is connected and fixed to the upper fixed point of the non-folding arm.

4. The foldable A-frame crane according to claim 1, characterized in that: The folding arm lower arm rotates around the folding arm lower arm pin at the bottom end, the non-folding arm rotates around the non-folding arm lower pin at the bottom end, and the lifting arm rotates around the lifting arm pin at the bottom end.

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