Luffing mechanism of crane

Abstract

The luffing mechanism of the crane comprises a base, a stand column is fixedly connected to the base, an engine compartment is fixedly installed on one side of the stand column, a first arm frame is rotationally connected to the other side of the stand column, and a second arm frame rotationally connected with the stand column is arranged above the first arm frame. The other end of the first arm frame is movably connected with the other end of the second arm frame through a support, the outer end of the support is movably connected with a lifting hook through a steel wire rope, a sliding rail is arranged on the lower side of the first arm frame, a movable counterweight assembly is slidably connected to the sliding rail, and an overweight prevention assembly is further fixedly connected to the outer end of the support. The movable counterweight assembly can adjust the gravity center position of the boom in the amplitude variation process to a certain extent, so that the stability is improved, the overweight prevention assembly adjusts the resistance of the sliding rod through the weight of goods, and the influence of overweight goods on the stability of the crane is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a luffing mechanism of a crane. Background Art

[0002] Crane is a kind of heavy machinery equipment widely used in construction, ports, mines and other fields for lifting and moving heavy objects; the luffing mechanism, as an important component of the crane, is responsible for adjusting the angle of the boom to change the working radius of the hook. The traditional luffing mechanism usually includes a hydraulic cylinder, wire rope and pulley system, and the angle change of the boom is achieved through the coordinated work of these components.

[0003] However, there are some problems with the existing crane luffing mechanism: in actual operation, the hook may be overloaded due to operator errors or inaccurate estimation of the cargo weight, which will not only cause damage to the crane structure but also may cause serious safety accidents.

[0004] During the luffing process of a floating crane, if the cargo on the hook is too light, the overall stability of the crane will decrease due to insufficient load, which increases the risk of the crane capsizing or losing control during operation, which may cause potential impact or damage to the hull. When the cargo is too heavy, the crane will exert greater pressure on the hull structure during the luffing process, causing deformation or damage to the hull structure. Summary of the invention

[0005] The main purpose of the present invention is to provide a luffing mechanism for a crane.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A luffing mechanism of a crane comprises a base 1, to which a column 2 is fixedly connected, an engine compartment 3 is fixedly installed on one side of the column 2, a first boom 4 is rotatably connected to the other side of the column 2, a second boom 5 rotatably connected to the column 2 is provided above the first boom 4, the other ends of the first boom 4 and the second boom 5 are movably connected via a bracket 7, and the outer end of the bracket 7 is movably connected to a hook 8 via a wire rope 6, a slide rail is provided at the lower side of the first boom 4, a movable counterweight assembly 9 is slidably connected to the slide rail, and an anti-overweight assembly is also fixedly connected to the outer end of the bracket 7.

[0008] Furthermore, the anti-overweight component includes a shell 16, a rope 15, a limit block 12, a tension spring 14 and a sliding rod resistor 13; the shell 16 is vertically fixedly installed at the end of the bracket 7, the rope 15 is fixedly connected to the limit block 12, the tension spring 14 is vertically installed below the limit block 12, and the sliding rod resistor 13 is vertically fixedly installed at one end of the rope 15 in the shell 16.

[0009] Furthermore, there are two limit blocks 12 , which are respectively connected to two ends of the tension spring 14 .

[0010] Furthermore, the sliding rod resistor 13 includes a slider 131, a guide rail 132 and a porcelain tube 133. The porcelain tube 133 is fixedly installed on the inner side of the housing 16. The slider 131 is provided on the guide rail 132 parallel to the porcelain tube 133. The slider 131 is connected to the limit block 12 below the tension spring 14.

[0011] Furthermore, the engine compartment 3 is also connected to the column 2 via a steel wire rope 6 .

[0012] Furthermore, a pulley is provided at the end of the bracket 7, and the rope 15 passes over the pulley and goes vertically downward.

[0013] Furthermore, a hydraulic cylinder 41 is fixedly mounted on the first arm 4 , and the other end of the hydraulic cylinder 41 is rotatably connected to a support frame 42 . A counterweight 11 is disposed at the end of the support frame 42 . A sensor is also disposed on the first arm 4 .

[0014] Furthermore, the lower end of the second arm 5 is connected to the column 2 via a damper 10 .

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention is provided with a movable counterweight assembly on the lower side of the first boom, and a slide rail is provided on the inner side of the first boom. The movable counterweight assembly is automatically adjusted along the slide rail through a sensor and a control system. The movement of the movable counterweight assembly can offset part of the unbalanced torque generated by the amplitude change of the first boom, which helps to reduce the shaking and vibration of the first boom.

[0017] 2. The lower end of the second boom is connected to the column through a damper. The damper is arranged on the second boom on the left side of the column, which can effectively absorb and reduce the impact generated by the second boom during the movement, extend the service life of the second boom, and enhance the smooth operation of the second boom, so that it can function in a more stable environment. At the same time, the damper cooperates with the second boom and the control system to more accurately control the position and speed of the hoisting weight and improve working efficiency.

[0018] 3. When the items are lifted, the rope will be pulled downward by the goods. The limit block at the lower end of the tension spring is fixedly connected to the slider of the sliding rod resistor. When the weight of the goods exceeds a certain limit, the slider of the sliding rod resistor slides downward. When the resistance value reaches the threshold, the control system will control the crane to suspend operation. When the resistance value is within a reasonable range, that is, it has not reached the threshold, the crane will operate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the crane luffing mechanism;

[0020] Figure 2 It is a schematic diagram of the local A structure;

[0021] Figure 3 It is a schematic diagram of the local B structure.

[0022] Reference numerals

[0023] 1. Base; 2. Column; 3. Engine compartment; 4. First boom; 5. Second boom; 6. Wire rope; 7. Bracket; 8. Hook; 9. Movable counterweight assembly; 10. Damper; 11. Counterweight block; 12. Limit block; 13. Sliding rod resistor; 14. Tension spring; 15. Rope; 16. Housing; 131. Slider; 132. Guide rail; 133. Porcelain tube; 41. Hydraulic cylinder; 42. Support frame. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] Example

[0026] A luffing mechanism of a crane comprises a base 1, to which a column 2 is fixedly connected, an engine compartment 3 is fixedly installed on one side of the column 2, a first boom 4 is rotatably connected to the other side of the column 2, a second boom 5 rotatably connected to the column 2 is provided above the first boom 4, the other ends of the first boom 4 and the second boom 5 are movably connected via a bracket 7, and the outer end of the bracket 7 is movably connected to a hook 8 via a wire rope 6, a slide rail is provided at the lower side of the first boom 4, a movable counterweight assembly 9 is slidably connected to the slide rail, and an anti-overweight assembly is also fixedly connected to the outer end of the bracket 7.

[0027] Furthermore, the anti-overweight component includes a shell 16, a rope 15, a limit block 12, a tension spring 14 and a sliding rod resistor 13; the shell 16 is vertically fixedly installed at the end of the bracket 7, the rope 15 is fixedly connected to the limit block 12, the tension spring 14 is vertically installed below the limit block 12, and the sliding rod resistor 13 is vertically fixedly installed at one end of the rope 15 in the shell 16.

[0028] Furthermore, there are two limit blocks 12 , which are respectively connected to two ends of the tension spring 14 .

[0029] Furthermore, the sliding rod resistor 13 includes a slider 131, a guide rail 132 and a porcelain tube 133. The porcelain tube 133 is fixedly installed on the inner side of the housing 16. The slider 131 is provided on the guide rail 132 parallel to the porcelain tube 133. The slider 131 is connected to the limit block 12 below the tension spring.

[0030] Furthermore, the engine compartment 3 is connected to the column 2 via a steel wire rope 6 .

[0031] Furthermore, a pulley is provided at the end of the bracket 7, and the rope 15 passes over the pulley and goes vertically downward.

[0032] Furthermore, a hydraulic cylinder 41 is fixedly mounted on the first arm 4 , and the other end of the hydraulic cylinder 41 is rotatably connected to a support frame 42 . A counterweight 11 is disposed at the end of the support frame 42 . A sensor is also disposed on the first arm 4 .

[0033] Furthermore, the lower end of the second arm 5 is connected to the column 2 via a damper 10 .

[0034] like Figure 1 As shown, a movable counterweight assembly 9 is provided on the lower side of the first boom 4, and a slide rail is provided on the inner side of the first boom 4. The movable counterweight assembly 9 is automatically adjusted along the slide rail through a sensor and a control system. The movement of the movable counterweight assembly 9 can offset part of the unbalanced torque generated by the amplitude change of the first boom 4, which helps to reduce the shaking and vibration of the first boom 4.

[0035] like Figure 2 As shown, the lower end of the second boom 5 is connected to the column 2 through a damper 10. The damper 10 is arranged on the second boom 5 on the left side of the column 2, which can effectively absorb and reduce the impact generated by the second boom 5 during the movement, thereby extending the service life of the second boom 5 and enhancing the smooth operation of the second boom 5, so that it can function in a more stable environment. At the same time, the damper 10 cooperates with the second boom 5 and the control system to more accurately control the position and speed of the hoisted weight and improve working efficiency.

[0036] like Figure 3 As shown, when the goods are hoisted, the rope 15 will be pulled downward by the goods, and the limit block 12 at the lower end of the tension spring 14 is fixedly connected with the slider 131 of the slide resistor 13. When the weight of the goods exceeds a certain limit, the slider 131 of the slide resistor 13 slides downward. When the resistance value reaches the threshold, the control system will control the crane to suspend operation. When the resistance value is within a reasonable range, that is, when it does not reach the threshold, the crane operates normally.

[0037] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A luffing mechanism of a crane, characterized in that: The invention comprises a base (1), a column (2) is fixedly connected to the base (1), an engine compartment (3) is fixedly installed on one side of the column (2), a first arm (4) is rotatably connected to the other side of the column (2), a second arm (5) is rotatably connected to the column (2) above the first arm (4), the other ends of the first arm (4) and the second arm (5) are movably connected via a bracket (7), and the outer end of the bracket (7) is movably connected to a hook (8) via a wire rope (6), a slide rail is provided on the lower side of the first arm (4), a movable counterweight assembly (9) is slidably connected to the slide rail, and an anti-overweight assembly is also fixedly connected to the outer end of the bracket (7).

2. The luffing mechanism of a crane according to claim 1, characterized in that: The anti-overweight component comprises a shell (16), a rope (15), a limit block (12), a tension spring (14) and a sliding rod resistor (13); the shell (16) is vertically fixedly installed at the end of the bracket (7), the rope (15) is fixedly connected to the limit block (12), a tension spring (14) is vertically installed below the limit block (12), and a sliding rod resistor (13) is vertically fixedly installed at one end of the inner side of the shell (16).

3. The luffing mechanism of a crane according to claim 2, characterized in that: There are two limit blocks (12), which are respectively connected to the two ends of the tension spring (14).

4. The luffing mechanism of a crane according to claim 2, characterized in that: The slide resistor (13) comprises a slider (131), a guide rail (132) and a porcelain tube (133); the porcelain tube (133) is fixedly mounted on the inner side of the housing (16); a slider (131) is arranged on the guide rail (132) parallel to the porcelain tube (133); and the slider (131) is connected to a limit block (12) below the tension spring (14).

5. The luffing mechanism of a crane according to claim 1, characterized in that: The engine compartment (3) is also connected to the column (2) via a steel wire rope (6).

6. The luffing mechanism of a crane according to claim 1, characterized in that: A pulley is also provided at the end of the bracket (7), and the rope (15) passes around the pulley and moves vertically downward.

7. The luffing mechanism of a crane according to claim 1, characterized in that: A hydraulic cylinder (41) is fixedly mounted on the first arm (4), the other end of the hydraulic cylinder (41) is rotatably connected to a support frame (42), a counterweight (11) is provided at the end of the support frame (42), and a sensor is also provided on the first arm (4).

8. The luffing mechanism of a crane according to claim 1, characterized in that: The lower end of the second arm (5) is connected to the column (2) via a damper (10).

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