Crane counterweight mechanism

Abstract

The utility model discloses a counterweight mechanism of a crane. The counterweight mechanism comprises a stand column, a movable arm, a linear power device and a counterweight block, the movable arm consists of a first movable arm and a second movable arm and is connected with the stand column and the balancing weight through a hinge shaft; the linear power device drives the movable arm to unfold and fold, the gravity center position of the balancing weight is adjusted, the balancing weight torque is increased, and the stability of the crane is improved. The movable arms are symmetrically arranged on the two sides of the stand column, occupied space is reduced, and operation in narrow space is facilitated. The balancing weights are connected through the hinge shafts, gravity center stability is guaranteed, and tension change is reduced. The utility model has the advantages of flexible operation, small occupied space and low cost, and is suitable for various crane equipment.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and more specifically, to a crane counterweight mechanism. Background Technology

[0002] Crane stability is one of the key indicators affecting the lifting performance of cranes. Therefore, when designing cranes, the counterweight mass is often increased to the limit that the axle can bear in order to maximize the stability of the whole machine.

[0003] Patent application number 202320321191.6 discloses a variable amplitude counterweight support, which has a truss installed at the tail of the turntable. The center of gravity of the counterweight is changed by the movement of the pulley group and the pull plate group, thereby achieving the purpose of adjusting the center of gravity of the counterweight. This structure does not occupy the tail space, but the structure is not compact enough and the rotation occupies a large space.

[0004] Patent application number 202010365921.3 discloses a folding counterweight mechanism in which the counterweight block is rotatably mounted on the frame in the vertical direction. By rotating the counterweight block, the center of gravity of the counterweight is shifted, thereby adjusting the center of gravity of the counterweight. However, in actual operation, rotating the counterweight block requires overcoming the friction between the counterweight block and the frame. It is particularly difficult to rotate, easy to get stuck, and difficult to operate, and not flexible enough. Utility Model Content

[0005] This utility model provides a crane counterweight mechanism that, through the cooperation of a movable boom and a linear power device, enables flexible adjustment of the counterweight, thereby improving the stability of the crane, while reducing space occupation and simplifying operation.

[0006] To solve the above-mentioned technical problems, this utility model provides a crane counterweight mechanism, including a column and a counterweight block, characterized in that: one end of the movable arm is connected to the upper end of the column through a first connecting shaft, and the other end is connected to the counterweight block;

[0007] One end of the linear power unit is connected to the lower end of the column via connecting shaft A; the other end is connected to the end of the movable arm near the counterweight via connecting shaft B.

[0008] Its effect is that by extending and retracting the linear power device, the center of gravity of the counterweight can be moved away from or closer to the center of rotation. By moving the center of gravity of the counterweight away from the center of rotation, the center of gravity of the whole machine can be shifted backward, thereby increasing the torque generated by the counterweight relative to the center of rotation, and thus improving the stability of the crane. Compared with the combined counterweight, this method is not limited by the weight of the whole machine and the bridge load, and does not require additional vehicles to transport the combined counterweight, thus reducing the cost of use.

[0009] Furthermore, the movable arm includes a first movable arm and a second movable arm; the first movable arm is connected to the column via a first connecting shaft; the second movable arm is connected to the first movable arm via a second connecting shaft; and a counterweight is connected to the front end of the second movable arm.

[0010] The linear power unit includes a first linear power unit and a second linear power unit. One end of the first linear power unit is connected to the column via a connecting shaft A, and the other end is connected to the first movable arm via a connecting shaft B. One end of the second linear power unit is connected to the first movable arm via a connecting shaft C, and the other end is connected to the second movable arm via a connecting shaft D.

[0011] Its effect is that, through the coordinated extension and retraction of two sets of movable arms and two sets of linear power devices, the counterweight moves along a predetermined trajectory, further increasing the working radius of the counterweight and further improving the stability of the crane.

[0012] Furthermore, the first movable arm consists of two sets, symmetrically arranged on both sides of the column.

[0013] The effect is that by placing the boom on both sides of the column, the space occupied by the entire mechanism at the rear of the crane is reduced, making it more adaptable when operating in confined spaces.

[0014] Furthermore, the counterweight is connected to the second movable arm via a third connecting shaft.

[0015] The effect is that the counterweight, connected by a hinge, always has its center of gravity directly below the connecting shaft, which reduces the change in tension of the counterweight relative to the movable arm, making the entire mechanism more stable. Furthermore, when the counterweight is retracted, it can be smoothly placed at the tail end of the crane. Attached Figure Description

[0016] Figure 1 This is a front view of the unfolded state of the crane counterweight mechanism of this utility model;

[0017] Figure 2 This is a front view of the crane counterweight mechanism of this utility model in its folded state;

[0018] Figure 3 This is a top view of the crane counterweight mechanism of this utility model in its folded state;

[0019] Figure 4 This is a trajectory diagram of the movable arm of this utility model.

[0020] Figure label:

[0021] 1. Automobile chassis; 2. Crane; 3. Column; 4. First boom; 5. Second boom; 6. Counterweight;

[0022] 11, First connecting shaft; 12, Second connecting shaft; 13, Third connecting shaft;

[0023] 21, First linear power unit; 22, Second linear power unit;

[0024] 25. Connecting shaft A; 26. Connecting shaft B; 27. Connecting shaft C; 28. Connecting shaft D; Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0026] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0028] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of the present invention, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0029] like Figure 1 As shown, a crane 2 is installed at the rear of the automobile chassis 1, and a crane counterweight mechanism is provided on the crane 2; the crane counterweight mechanism includes a column 3 and a counterweight block 6, and the crane counterweight mechanism also includes a movable arm and a linear power device.

[0030] One end of the movable arm is hinged to the upper end of the column 3 via the first connecting shaft 11, and the other end of the movable arm is also connected to a counterweight 6.

[0031] One end of the linear power unit is hinged to the end of the movable arm near the counterweight via connecting shaft B 26, and the other end is connected to the column via connecting shaft A 25.

[0032] During operation, the extension of the linear power unit moves the center of gravity of counterweight 6 away from the center of rotation, thus shifting the overall center of gravity of the crane backward. As the counterweight 6 moves away from the center of rotation, it moves upward relative to the ground, increasing the torque generated by the counterweight 6 relative to the center of rotation, thereby improving the stability of the crane. This method, compared to combined counterweights, is not limited by the overall weight of the crane or the bridge load. When not in use, the linear power unit retracts, and the counterweight retracts to the rear of the crane, reducing the space occupied on the crane.

[0033] like Figure 1-2 As shown, the movable arm includes a first movable arm 4 and a second movable arm 5; the first movable arm 4 is connected to the column 3 via a first connecting shaft 11; the second movable arm 5 is connected to the first movable arm 4 via a second connecting shaft 12; and a counterweight 6 is connected to the front end of the second movable arm 5.

[0034] The linear power unit includes a first linear power unit 21 and a second linear power unit 22. One end of the first linear power unit 21 is connected to the column 3 via a connecting shaft A 25, and the other end is connected to the first movable arm 4 via a connecting shaft B 26. One end of the second linear power unit 22 is connected to the first movable arm 4 via a connecting shaft C 27, and the other end is connected to the second movable arm 5 via a connecting shaft D 28.

[0035] By coordinating the extension and retraction actions of two sets of movable arms and two sets of linear power devices, the counterweight 6 moves along a predetermined trajectory, further increasing the radius of motion of the counterweight 6 and further improving the stability of the crane.

[0036] like Figure 4 As shown, the first movable arm 5 rotates relative to the column 3 around the first connecting shaft 11, with a maximum opening angle of 90 degrees; the second movable arm 6 rotates relative to the first movable arm 4 around the second connecting shaft 12, with a maximum opening angle of 150 degrees. The linear power device enables the first movable arm 4 and the second movable arm 5 to move along a fixed trajectory through extension and retraction actions.

[0037] like Figure 3 As shown, the first movable boom 4 is grouped and symmetrically arranged on both sides of the column, reducing the space occupied by the entire mechanism at the rear of the crane. This makes it more adaptable when operating in confined spaces.

[0038] The counterweight 6 is connected to the second movable arm 5 via the third connecting shaft 13. Because the counterweight 6 is hinged, its center of gravity is always directly below the third connecting shaft 13, which reduces the tension variation of the counterweight relative to the movable arm, making the entire mechanism more stable. Furthermore, when the counterweight is retracted, it can be smoothly placed at the tail end of the crane.

[0039] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions based on this utility model using techniques known in the art all fall within the protection scope of this utility model and should be defined by the claims.

Claims

1. A counterweight mechanism for a crane, comprising a column (3) and a counterweight block (6), characterized in that: The crane counterweight mechanism also includes a movable boom and a linear power unit; One end of the movable arm is connected to the upper end of the column (3) via the first connecting shaft (11), and the other end is connected to the counterweight (6). The linear power device is hinged to one end of the movable arm near the counterweight (6) via connecting shaft B (26), and the other end is connected to the column (3) via connecting shaft A (25).

2. The crane counterweight mechanism according to claim 1, characterized in that: The movable arm includes a first movable arm (4) and a second movable arm (5); the first movable arm (4) is connected to the column (3) via a first connecting shaft (11); the second movable arm (5) is connected to the first movable arm (4) via a second connecting shaft (12); and a counterweight (6) is connected to the front end of the second movable arm (5). The linear power device includes a first linear power device (21) and a second linear power device (22), wherein one end of the first linear power device (21) is connected to the column via a connecting shaft A (25), and the other end is connected to the first movable arm (4) via a connecting shaft B (26); One end of the second linear power unit is connected to the first movable arm (4) via connecting shaft C (27), and the other end is connected to the second movable arm (5) via connecting shaft D (28).

3. The crane counterweight mechanism according to claim 2, characterized in that: The first movable arm (4) has a maximum opening angle of 90 degrees, and the second movable arm (5) has a maximum opening angle of 150 degrees relative to the first movable arm (4).

4. The crane counterweight mechanism according to any one of claims 1-2, characterized in that: The linear power device is a hydraulic cylinder.

5. The crane counterweight mechanism according to claim 2, characterized in that: The first movable arm (4) consists of two sets, symmetrically arranged on both sides of the column (3).

6. The crane counterweight mechanism according to claim 2, characterized in that: The counterweight (6) is connected to the second movable arm (5) via the third connecting shaft (13).

7. The crane counterweight mechanism according to claim 1, characterized in that: The counterweight (6) is retracted to the tail of the crane in a folded state.

Images