Crane supporting leg turnover mechanism and crane

Abstract

The invention discloses a crane landing leg turnover mechanism and a crane, and particularly relates to the technical field of crane landing legs, the crane landing leg turnover mechanism comprises a fixing plate, an L-shaped connecting rod piece, a telescopic landing leg and a landing leg seat, one end of the L-shaped connecting rod piece is hinged to the free end of the telescopic landing leg to form a first hinge point, and the other end of the L-shaped connecting rod piece is hinged to the fixing plate to form a second hinge point; the fixed end of the telescopic supporting leg is connected with one end of the supporting leg seat, the other end of the supporting leg seat is hinged to the fixed plate to form a third hinge point, when the telescopic supporting leg is in a complete retraction state, the first hinge point, the second hinge point and the third hinge point are collinear, and the second hinge point is located between the first hinge point and the third hinge point. Linear telescopic motion of the supporting leg air cylinder is converted into supporting leg overturning motion, the overturning process is stable and reliable, the structure is simple, cost is low, and the requirements of various working environments are met.

Description

Technical Field

[0001] The present invention relates to the technical field of crane legs, in particular to a crane leg turning mechanism and a crane. Background Art

[0002] Currently, there are various types of crane outrigger tilting mechanisms. Some use a small hydraulic cylinder to pull a wire rope to achieve tilting, some use a movable pulley with a push rod to push the wire rope to achieve the action, and some use a crank-slide mechanism or rack-and-pinion transmission to achieve outrigger tilting.

[0003] While the aforementioned crane leg-flipping mechanisms offer a variety of options for engineering operations, they also have numerous drawbacks. Some, such as the small hydraulic cylinder pulling a steel wire rope, are susceptible to wear and breakage from prolonged tension. Furthermore, the hydraulic cylinder requires high sealing performance, and leakage can lead to insufficient power for flipping. The movable pulley mechanism with a push rod, due to its complex structure and multiple transmission components, is difficult to install and debug, and has high troubleshooting and repair costs. The crank-slide mechanism is prone to deformation or jamming of its rods under complex operating conditions, affecting the smoothness and reliability of the flip. Rack-and-pinion mechanisms require stringent manufacturing precision, and tooth wear can reduce transmission efficiency and even lead to safety hazards such as incomplete leg flipping. Furthermore, they are noisy, limiting their applicability in environments requiring high noise control. Summary of the Invention

[0004] The purpose of the present invention is to provide a crane leg flipping mechanism and a crane to solve the problems existing in the above-mentioned prior art. The linear telescopic motion of the leg cylinder is converted into a leg flipping action. The flipping process is smooth and reliable, the structure is simple, the cost is low, and it meets the requirements of various working environments.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a crane leg flipping mechanism, comprising a fixed plate, an L-shaped connecting rod, a telescopic leg and a leg seat, wherein one end of the L-shaped connecting rod is hinged to the free end of the telescopic leg to form a first hinge point, the other end of the L-shaped connecting rod is hinged to the fixed plate to form a second hinge point, the fixed end of the telescopic leg is connected to one end of the leg seat, and the other end of the leg seat is hinged to the fixed plate to form a third hinge point. When the telescopic leg is in a fully retracted state, the first hinge point, the second hinge point and the third hinge point are collinear, and the second hinge point is located between the first hinge point and the third hinge point.

[0007] Preferably, the free end of the telescopic leg is hinged to a first hinge shaft, and both ends of the first hinge shaft are symmetrically hinged to the L-shaped connecting rod.

[0008] Preferably, one end of the leg seat away from the telescopic leg is hinged to a third hinge shaft, and both ends of the third hinge shaft are symmetrically hinged to the fixing plate.

[0009] Preferably, the L-shaped connecting rod includes a telescopic rod and a rotating plate, one end of the telescopic rod is fixedly connected to the rotating plate, the other end of the telescopic rod is hinged to the free end of the telescopic leg, and the rotating plate is hinged to the fixed plate through a second hinge axis. A locking member for locking the length of the telescopic rod is provided on the telescopic rod, and the length of the telescopic rod is fixed when the telescopic leg is flipped.

[0010] Preferably, the telescopic rod includes a first rod and a second rod, the first rod is slidably sleeved on the second rod, and the locking member is installed at the sleeve joint of the first rod and the second rod.

[0011] Preferably, the telescopic leg includes a telescopic hydraulic cylinder and a support plate, the telescopic hydraulic cylinder includes a piston rod and a cylinder barrel, the cylinder barrel is fixedly connected to the leg seat, and the end of the piston rod away from the cylinder barrel is vertically fixedly connected to the support plate.

[0012] The present invention also provides a crane, comprising the crane leg turning mechanism.

[0013] Compared with the prior art, the present invention has achieved the following technical effects:

[0014] The present invention provides a crane leg flipping mechanism and a crane, wherein the leg seat is hinged to a fixed third hinge point, and when the telescopic leg is extended or retracted, the L-shaped connecting rod can transmit the thrust or pulling force of the telescopic leg to the telescopic leg, driving the telescopic leg to rotate around the third hinge point, thereby converting the telescopic linear motion of the telescopic leg into a flipping motion of the telescopic leg; and the L-shaped connecting rod is hinged to a fixed second hinge point, which can constrain the first hinge point to only perform circular motion along a circle with the second hinge point as the center and the distance between the second hinge point and the first hinge point as the radius, thereby ensuring the stability of the flipping motion; the first hinge point, the telescopic leg, the leg seat and the third hinge point form a dynamic triangle mechanism, and as the telescopic leg is extended or retracted, the first hinge point is hinged to the third hinge point. The position of the point changes, which causes the shape and size of the dynamic triangle mechanism to change, and the first hinge point, the L-shaped connecting rod and the second hinge point constitute a static triangle mechanism. The dynamic triangle mechanism and the static triangle mechanism form a double triangle mechanism, which avoids the telescopic legs from shaking or offsetting during the flipping process, further ensures the stability of the structural load and the flipping process, and can also disperse the force to protect the service life of the telescopic legs; at the same time, the telescopic legs serve as the only power source of the leg flipping mechanism, and do not use an additional flipping mechanism, so the structure is simple, the number of moving parts is reduced, the complexity of the mechanism is reduced, the manufacturing cost, assembly difficulty and maintenance workload are reduced, and the failure rate is reduced, thereby improving the reliability of the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a structural diagram of the crane leg flipping mechanism;

[0017] Figure 2 This is a structural diagram of the crane leg flipping mechanism from another perspective;

[0018] Figure 3 Schematic diagram of the crane's outrigger tilting mechanism without an L-shaped connecting rod;

[0019] Figure 4 A structural diagram of the crane leg tilting mechanism from another perspective without an L-shaped connecting rod;

[0020] Figure 5 It is a line diagram of the flipping process of the crane leg flipping mechanism;

[0021] Figure 6 A schematic diagram of a crane leg tilting mechanism with the tilting leg at the highest point;

[0022] Figure 7 A schematic diagram of a crane leg tilting mechanism with the tilting leg located at the middle node;

[0023] Figure 8 This is a schematic diagram of the crane leg tilting mechanism with the tilting leg at the lowest point.

[0024] In the figure: 1-fixed plate; 2-L-shaped connecting rod; 3-telescopic leg; 4-leg seat; 5-first hinge point; 6-second hinge point; 7-third hinge point; 8-first hinge axis; 9-second hinge axis; 10-third hinge axis; 11-telescopic rod; 12-rotating plate; 13-locking member; 14-first rod; 15-second rod; 16-support plate; 17-telescopic hydraulic cylinder. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a crane leg flipping mechanism and a crane to solve the problems existing in the above-mentioned prior art. The linear telescopic motion of the leg cylinder is converted into a leg flipping action. The flipping process is smooth and reliable, the structure is simple, the cost is low, and it meets the requirements of various working environments.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] This embodiment provides a crane leg flipping mechanism, such as Figures 1-4 As shown, it includes a fixed plate 1, an L-shaped connecting rod 2, a telescopic leg 3 and a leg seat 4. One end of the L-shaped connecting rod 2 is hinged to the free end of the telescopic leg 3 to form a first hinge point 5, and the other end of the L-shaped connecting rod 2 is hinged to the fixed plate 1 to form a second hinge point 6. The fixed end of the telescopic leg 3 is connected to one end of the leg seat 4, and the other end of the leg seat 4 is hinged to the fixed plate 1 to form a third hinge point 7. When the telescopic leg 3 is in a fully retracted state, the first hinge point 5, the second hinge point 6 and the third hinge point 7 are collinear, and the second hinge point 6 is located between the first hinge point 5 and the third hinge point 7. The leg seat 4 is hinged to the fixed third hinge point 7. When the telescopic leg 3 is extended or retracted, the L-shaped connecting rod 2 can transmit the thrust or pulling force of the telescopic leg 3 to the telescopic leg 3, driving the telescopic leg 3 to rotate around the third hinge point 7, thereby converting the telescopic linear motion of the telescopic leg 3 into a flipping motion of the telescopic leg 3; and the L-shaped connecting rod 2 is hinged to the fixed second hinge point 6, which can constrain the first hinge point 5 to only make circular motion along a circle with the second hinge point 6 as the center and the distance between the second hinge point 6 and the first hinge point 5 as the radius, thereby ensuring the stability of the flipping motion; the first hinge point 5, the telescopic leg 3, the leg seat 4 and the third hinge point 7 constitute a dynamic triangle mechanism. As the telescopic leg 3 is extended or retracted, the position of the first hinge point 5 changes, resulting in the shape and size of the dynamic triangle mechanism. The first hinge point 5, the L-shaped connecting rod 2 and the second hinge point 6 form a static triangle mechanism, and the dynamic triangle mechanism and the static triangle mechanism form a double triangle mechanism. The static triangle is rigidly connected to the L-shaped connecting rod 2 to constrain the motion trajectory of the first hinge point, so that the telescopic leg 3 maintains a smooth transition during the telescopic and flipping process, reduces jitter and offset, further ensures the stability of the structural load and flipping process, and can also disperse the force to protect the service life of the telescopic leg 3; at the same time, the telescopic leg 3 serves as the only power source of the leg flipping mechanism, and does not use an additional flipping mechanism, has a simple structure, reduces the number of moving parts, reduces the complexity of the mechanism, reduces manufacturing costs, assembly difficulty and maintenance workload, and at the same time reduces the failure rate and improves the reliability of the mechanism.

[0030] like Figure 5 As shown, point A is set as the second hinge point 6, point B is the third hinge point 7, and point C is the first hinge point 5. Among them, point A and point B are both fixed hinge points (that is, the hinge position is fixed and cannot be moved), the connecting rod CD is the telescopic leg 3, the rod BD represents the leg seat 4, and point B is the rotation center of the leg seat BD (that is, the leg seat 4 can only rotate around point B). AEC is an L-shaped connecting rod, in which AE is the telescopic rod, and the rotation center of AEC is located at point A. In terms of geometric relationship, the small circle defined by point B as the center and the length of line segment BC as the radius is inscribed in the large circle defined by point A as the center and the length of line segment AC as the radius, and points A, B, and C are collinear (that is, the three points are on the same straight line). As Figure 6-Figure 8 As shown, when the telescopic leg 3 is in a fully retracted state, the telescopic rod AE is perpendicular to the horizontal ground (i.e., the telescopic rod is vertically upward), and the telescopic leg 3 is at the highest point. As the telescopic leg CD gradually extends, since the length of the L-shaped connecting rod AEC is fixed (i.e., the total length of the L-shaped connecting rod 2 cannot be changed), the movement of point C is constrained by the length of the AEC connecting rod. At this time, point C can only perform circular motion along the large circle trajectory with point A as the center, thereby driving the telescopic leg 3CD to perform a flipping action. During the flipping process of the telescopic leg CD, the leg base BD rotates around its fixed rotation center B, and the length of the line segment BC changes dynamically with the position of point C. This dynamic change process ensures that the leg always maintains geometric constraints during the coordinated movement of extension and flipping, thereby achieving a stable and controllable motion trajectory.

[0031] It is further preferred in the implementation manner of this embodiment that the free end of the telescopic leg 3 is hinged to the first hinge shaft 8, and the two ends of the first hinge shaft 8 are symmetrically hinged to the L-shaped connecting rods 2, and the two L-shaped connecting rods 2 further ensure the stability of the flipping process.

[0032] It is further preferred in the implementation manner of this embodiment that one end of the leg seat 4 away from the telescopic leg 3 is hinged to the third hinge shaft 10 , and both ends of the third hinge shaft 10 are symmetrically hinged to the fixed plate 1 .

[0033] In the embodiment of this invention, the L-shaped connecting rod 2 preferably includes a telescopic rod 11 and a rotating plate 12. One end of the telescopic rod 11 is welded to the rotating plate 12, and the other end of the telescopic rod 11 is hinged to the free end of the telescopic leg 3. The rotating plate 12 is hinged to the fixed plate 1 via a second hinge axis 9. The telescopic rod 11 is provided with a locking member 13 for locking the length of the telescopic rod 11. During the tilting process of the telescopic leg 3, the length of the telescopic rod 11 is fixed, ensuring that the telescopic leg 3 always moves along a predetermined trajectory, thereby achieving precise positioning and stability control of the tilting movement of the telescopic leg 3. When the telescopic leg 3 completes its tilting and reaches a vertical downward position (i.e., at a 90° angle to the horizontal ground), the telescopic leg 3 no longer needs to be tilted. The operator can manually release the constraint of the locking member 13, switching the telescopic rod 11 from the rigidly constrained state to a freely retractable mode. The telescopic leg 3 continues to extend downward to support the ground, which in turn drives the telescopic rod 11 to extend, thereby supporting the vehicle body. At this point, the tilting movement of the leg has met the initial positioning requirements, and no further rotation adjustment is required. At this point, the operator can manually release the lock 13 (e.g., loosen the lock) to switch the telescopic rod 11 from a rigidly constrained state to a freely retractable mode. Subsequently, the telescopic rod 11 can extend along with the telescopic legs 3 as they continue to extend downward until they contact the ground and support the vehicle body, thereby bearing the equipment load and enhancing overall stability.

[0034] In the implementation of this embodiment, it is further preferred that the telescopic rod 11 includes a first rod 14 and a second rod 15 , the first rod 14 is slidably sleeved on the second rod 15 , and the locking member 13 is installed at the sleeve joint of the first rod 14 and the second rod 15 .

[0035] It is further preferred in the implementation manner of this embodiment that the telescopic leg 3 includes a telescopic hydraulic cylinder 17 and a support plate 16, the telescopic hydraulic cylinder 17 includes a piston rod and a cylinder barrel, the cylinder barrel is fixedly connected to the leg seat 4, and the end of the piston rod away from the cylinder barrel is vertically fixedly connected to the support plate 16.

[0036] Example 2

[0037] This embodiment provides a crane, comprising the crane leg flipping mechanism of embodiment 1. The crane has a simple structure, can reduce failure points, save energy, and is easy to maintain.

[0038] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A crane leg flipping mechanism, characterized in that: It includes a fixed plate, an L-shaped connecting rod, a telescopic leg and a leg seat, one end of the L-shaped connecting rod is hinged to the free end of the telescopic leg to form a first hinge point, the other end of the L-shaped connecting rod is hinged to the fixed plate to form a second hinge point, the fixed end of the telescopic leg is connected to one end of the leg seat, and the other end of the leg seat is hinged to the fixed plate to form a third hinge point. When the telescopic leg is in a fully retracted state, the first hinge point, the second hinge point and the third hinge point are collinear, and the second hinge point is located between the first hinge point and the third hinge point.

2. The crane leg flipping mechanism according to claim 1, characterized in that: The free end of the telescopic leg is hinged to the first hinge shaft, and the two ends of the first hinge shaft are symmetrically hinged to the L-shaped connecting rod.

3. The crane leg flipping mechanism according to claim 2, characterized in that: One end of the leg seat away from the telescopic leg is hinged to the third hinge shaft, and two ends of the third hinge shaft are symmetrically hinged to the fixing plate.

4. The crane leg flipping mechanism according to claim 2, characterized in that: The L-shaped connecting rod includes a telescopic rod and a rotating plate, one end of the telescopic rod is fixedly connected to the rotating plate, the other end of the telescopic rod is hinged to the free end of the telescopic leg, and the rotating plate is hinged to the fixed plate through a second hinge axis. A locking piece for locking the length of the telescopic rod is provided on the telescopic rod. When the telescopic leg is flipped, the length of the telescopic rod is fixed.

5. The crane leg flipping mechanism according to claim 4, characterized in that: The telescopic rod comprises a first rod and a second rod, the first rod is slidably sleeved on the second rod, and the locking member is installed at the sleeve joint of the first rod and the second rod.

6. The crane leg flipping mechanism according to claim 1, characterized in that: The telescopic support leg includes a telescopic hydraulic cylinder and a support plate. The telescopic hydraulic cylinder includes a piston rod and a cylinder barrel. The cylinder barrel is fixedly connected to the support leg seat. The end of the piston rod away from the cylinder barrel is vertically fixedly connected to the support plate.

7. A crane, characterized in that: The invention comprises the crane leg flipping mechanism according to any one of claims 1 to 6.

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