Span self-adjusting amplitude-variable system and crane

Abstract

The application discloses a span self-adjusting luffing system and a crane in the technical field of cranes, and aims to solve the problem that in the prior art, when a luffing system is assembled and connected, it is usually necessary to stand on a boom to work, and the dismounting and mounting of the luffing system cannot be completed on the ground. The luffing system comprises a boom and a luffing mechanism arranged on the crane, and the boom is located at one side of the luffing mechanism. The luffing mechanism comprises a pull plate group, the pull plate group comprises two first pull plates, the two ends of each first pull plate are provided with an adapter pull plate, a telescopic mechanism is arranged between the two adapter pull plates, a balance mechanism is movably connected to the telescopic mechanism, one balance mechanism is movably connected to a mast, and the other balance mechanism is movably connected to a top section arm. The application is suitable for the dismounting and mounting of the luffing mechanism, the telescopic mechanism and the balance mechanism are matched, the luffing mechanism can be dismounted and mounted without standing on the boom, the stability of the luffing mechanism is not affected, and the safety and the practicability of the device are ensured.

Description

Technical Field

[0001] This invention relates to a pitch-adjustable luffing system and a crane, belonging to the field of crane technology. Background Technology

[0002] In recent years, the concept of intelligent manufacturing has permeated all walks of life. As an important lifting equipment, crawler cranes are increasingly emphasizing intelligent and automated production. The tie plate or cable, as a crucial luffing mechanism in crawler cranes, has traditionally required operators to stand on the boom to connect the tie plate and cable using auxiliary equipment during assembly and connection. This is considered high-altitude work, posing safety risks and is time-consuming and labor-intensive.

[0003] When assembling and connecting the luffing system of an existing crane, it is usually necessary to stand on the boom to work, making it impossible to complete the disassembly and assembly of the luffing system on the ground, resulting in poor safety and practicality of the device. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a luffing system and crane with self-adjusting pitch, which solves the problem that when assembling and connecting the luffing system, it is usually necessary to stand on the boom to work, and it is impossible to complete the assembly and disassembly of the luffing system on the ground.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0006] In a first aspect, the present invention provides a pitch self-adjusting luffing system, including a boom and a luffing mechanism mounted on a crane, wherein the boom is located on one side of the luffing mechanism;

[0007] The luffing mechanism includes a pull plate assembly, which includes two first pull plates. Each first pull plate has symmetrically arranged transition pull plates at both ends. A telescopic mechanism is provided between two adjacent transition pull plates. The telescopic mechanism is used to adjust the distance between the two first pull plates. A balancing mechanism is movably connected to the telescopic mechanism. One balancing mechanism is movably connected to the mast, and the other is movably connected to the top boom. When the two balancing mechanisms approach each other, the balancing mechanism is used to extend the telescopic mechanism. The length of the first pull plate is greater than the length of the boom, and the maximum length of the telescopic mechanism is at least greater than the width of the boom.

[0008] Furthermore, the telescopic mechanism includes a first core tube and a second core tube slidably connected to the first core tube. The first core tube has a first ear plate at the end away from the second core tube, and the second core tube has a second ear plate at the end away from the first core tube. The first ear plate is connected to one of the adapter plates located on the same side, and the second ear plate is connected to the other adapter plate located on the same side.

[0009] Furthermore, the first ear plate is connected to the adapter plate via a first pin, and the second ear plate is connected to the adapter plate via a second pin.

[0010] Furthermore, the first core tube is located outside the second core tube, the length of the first core tube is greater than the length of the second core tube, and the shortest length of the telescopic mechanism is equal to the length of the first core tube.

[0011] Furthermore, the balancing mechanism includes a second pull plate, with symmetrically arranged third pull plates at both ends of the second pull plate. One of the third pull plates is rotatably connected to the first pin at the end away from the second pull plate, and the other third pull plate is rotatably connected to the second pin at the end away from the second pull plate. The outer walls of the two second pull plates are symmetrically arranged with connecting groups on opposite sides. One connecting group is rotatably connected to the mast, and the other connecting group is rotatably connected to the top section arm. The length of the second pull plate is less than the length of the first core tube.

[0012] Furthermore, the connecting assembly includes two connecting rods, one end of which is rotatably connected to an adapter plate, and the adapter plate is connected to the second pull plate via a third pin.

[0013] Furthermore, the boom is provided with a guide mechanism, which includes guide blocks symmetrically arranged on the boom, and the guide blocks are rotatably connected to the boom.

[0014] Furthermore, the guiding mechanism consists of two sets, each located on the boom.

[0015] Furthermore, it also includes a lifting mechanism for driving the luffing mechanism to rise and fall.

[0016] In a second aspect, the present invention provides a crane including the pitch self-adjusting luffing system described in any one of the first aspects.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0018] 1. This luffing system with self-adjusting pitch, through the cooperation of the telescopic mechanism and the balancing mechanism, when the luffing mechanism is in working state, the telescopic mechanism is in the telescopic state, and the pitch of the luffing mechanism is small, so as not to affect the stability of the luffing mechanism. When it is necessary to disassemble or assemble the luffing mechanism, the telescopic mechanism is in the extended state, the pitch of the luffing mechanism is increased, and the distance between the two first pull plates is greater than the width of the boom, so that the luffing mechanism can be lowered along the outside of the boom, so that the disassembly and assembly of the luffing mechanism can be completed on the ground. Without affecting the stability of the luffing mechanism, there is no need to stand on the boom to disassemble or assemble the luffing mechanism, thus ensuring the safety and practicality of the device.

[0019] 2. The present invention guides the first pull plate through the guide block, assists the two first pull plates to move closer or further apart, and limits the amplitude-changing mechanism, thus ensuring the stability of the device during operation. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a pitch self-adjusting amplitude system provided according to an embodiment of the present invention;

[0021] Figure 2 This is a three-dimensional structural schematic diagram of the boom provided according to an embodiment of the present invention;

[0022] Figure 3 This is a three-dimensional structural schematic diagram of the amplitude-changing mechanism provided according to an embodiment of the present invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the balancing mechanism and the telescopic mechanism provided according to an embodiment of the present invention;

[0024] Figure 5 This is a three-dimensional structural schematic diagram of the telescopic mechanism provided according to an embodiment of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the telescopic mechanism provided in the embodiment of the present invention in the extended state.

[0026] In the diagram: 1. Boom; 2. Luffing mechanism; 21. Pull plate assembly; 211. First pull plate; 212. Transfer pull plate; 22. Balancing mechanism; 221. Second pull plate; 222. Third pull plate; 3. First core tube; 4. Second core tube; 5. First ear plate; 6. Second ear plate; 7. Connecting rod; 8. Guide block; 9. Transfer plate. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Example 1:

[0031] like Figure 1-6 As shown, the present invention provides a luffing system with self-adjusting pitch, including a boom 1 and a luffing mechanism 2 mounted on a crane. The boom 1 is located on one side of the luffing mechanism 2. The luffing mechanism 2 includes a pull plate assembly 21, which includes two first pull plates 211. The two ends of the first pull plates 211 are symmetrically provided with transition pull plates 212. A telescopic mechanism is provided between two adjacent transition pull plates 212. The telescopic mechanism is used to adjust the distance between the two first pull plates 211. A balancing mechanism 22 is movably connected to the telescopic mechanism. One balancing mechanism 22 is movably connected to the mast, and the other balancing mechanism 22 is movably connected to the top boom. The length of the first pull plate 211 is greater than the length of the boom 1, and the maximum length of the telescopic mechanism is at least greater than the width of the boom 1. The system also includes a lifting mechanism for driving the luffing mechanism 2 to rise and fall.

[0032] Specifically, the two ends of boom 1 are connected to the top boom and bottom boom respectively. The bottom boom is located on the crane. The luffing mechanism 2 and the mast are both located on the crane. When the crane is working normally, the luffing mechanism 2 is located above boom 1, which plays a stabilizing role for the crane. When it is necessary to disassemble or assemble the luffing mechanism 2, the crane is controlled to place boom 1 flat on the ground. At this time, the mast is controlled to move so that the mast and the top boom are relatively close, thereby bringing the two balancing mechanisms 22 in the luffing mechanism 2 closer to each other. The balancing mechanisms 22 drive the telescopic mechanism to extend, so that the distance between the two first pull plates 211 in the pull plate assembly 21 is greater than the width of boom 1, and the length of the first pull plate 211 is greater than the length of boom 1. At this time, the entire luffing mechanism 2 is on the outside of boom 1, and one end of the luffing mechanism 2 can be detached from the mast and the top boom, so that the luffing mechanism 2 falls to the ground along the outside of boom 1, allowing the operator to operate the luffing machine from the ground. The luffing mechanism 2 can be disassembled and assembled without the need to stand on the boom 1, ensuring the safety and practicality of the device. Optionally, after the luffing mechanism 2 is disassembled from the mast and the top boom, a lifting mechanism can be installed on the ground. The lifting mechanism is located on one side of the boom 1, and the luffing mechanism 2 rests on the lifting mechanism. The lifting mechanism will drive the luffing mechanism 2 to descend or rise, which will buffer the descent of the luffing mechanism 2 and facilitate the lifting of the luffing mechanism 2 back to its original position after the work is completed, ensuring the convenience of the device. After the disassembly and assembly of the luffing mechanism 2 is completed, the luffing mechanism 2 is reinstalled, and the mast returns to its original position. At this time, the relative distance between the mast and the top boom is reduced, and the two balancing mechanisms 22 are also moved away from each other, causing the telescopic mechanism to shorten, which reduces the distance between the two first pull plates 211. The distance between the two is less than the width of the boom 1, thereby automatically adjusting the pitch of the luffing mechanism 2 and ensuring the stability of the luffing mechanism 2 during operation.

[0033] This invention utilizes a telescopic mechanism and a balancing mechanism 22. When the luffing mechanism 2 is in operation, the telescopic mechanism is in a telescopic state, resulting in a smaller span for the luffing mechanism 2, thus avoiding any impact on its stability. When the luffing mechanism 2 needs to be disassembled or assembled, the telescopic mechanism is in an extended state, increasing the span of the luffing mechanism 2. Furthermore, the distance between the two first pull plates 211 is greater than the width of the boom 1, allowing the luffing mechanism 2 to fall along the outer side of the boom 1. This facilitates the disassembly and assembly of the luffing mechanism 2 on the ground, without affecting its stability. Furthermore, it eliminates the need to stand on the boom 1 to disassemble or assemble the luffing mechanism 2, ensuring the safety and practicality of the device.

[0034] In one embodiment, the telescopic mechanism includes a first core tube 3 and a second core tube 4 slidably connected to the first core tube 3. The first core tube 3 is provided with a first ear plate 5 at the end away from the second core tube 4, and the second core tube 4 is provided with a second ear plate 6 at the end away from the first core tube 3. The first ear plate 5 is connected to one of the adapter pull plates 212 located on the same side, and the second ear plate 6 is connected to the other adapter pull plate 212 located on the same side.

[0035] Specifically, the first ear plate 5 is used to connect the first core tube 3 to one of the adapter pull plates 212, and the second ear plate 6 is used to connect the second core tube 4 to the corresponding other adapter pull plate 212. When the balancing mechanism 22 drives the telescopic mechanism to extend or shorten, the first core tube 3 and the second core tube 4 slide relative to each other, thereby adjusting the distance between the two first pull plates 211. Optionally, the first ear plate 5 is connected to the adapter pull plate 212 through the first pin, and the second ear plate 6 is connected to the adapter pull plate 212 through the second pin.

[0036] In one embodiment, the first core tube 3 is located outside the second core tube 4, and the length of the first core tube 3 is greater than the length of the second core tube 4. The shortest length of the telescopic mechanism is equal to the length of the first core tube 3. When the luffing mechanism 2 is in working state, the telescopic mechanism is in its shortest state, and the second core tube 4 is completely submerged inside the first core tube 3. Furthermore, the length of the first core tube 3 is greater than the length of the second pull plate 221. This ensures the stability of the luffing mechanism 2 during operation, with the first core tube 3 serving as a lateral pressure-bearing component.

[0037] In one embodiment, the balancing mechanism 22 includes a second pull plate 221, and two ends of the second pull plate 221 are symmetrically provided with rotatably connected third pull plates 222. One end of the third pull plate 222 away from the second pull plate 221 is rotatably connected to the first pin, and the other end of the third pull plate 222 away from the second pull plate 221 is rotatably connected to the second pin. The outer walls of the two second pull plates 221 are symmetrically provided with connecting groups on opposite sides. One connecting group is rotatably connected to the mast, and the other connecting group is rotatably connected to the top arm. The length of the second pull plate 221 is less than the length of the first core tube 3.

[0038] Specifically, the second pull plate 221, the third pull plate 222, and the telescopic mechanism form an isosceles trapezoid. When the mast and the top arm approach each other, the position of the connecting assembly pushes the two second pull plates 221 closer together, causing the second pull plates 221 to move closer towards the telescopic mechanism. The distance between the second pull plates 221 and the telescopic mechanism decreases, thereby causing the third pull plate 222 to rotate around one end of the second pull plate 221. The ends of the two third pull plates 222 that are away from the second pull plate 221 move away from each other, thereby causing the first core tube 3 and the second core tube 4 to move away from each other, causing the telescopic mechanism to extend, thus controlling... The distance between the two first pull plates 211 is increased to facilitate the disassembly and assembly of the luffing mechanism 2. When the mast and the top arm move away from each other, the two second pull plates 221 move away from each other, causing the ends of the two third pull plates 222 that are away from the second pull plates 221 to move closer to each other. This causes the telescopic mechanism to retract, which in turn moves the two first pull plates 211 closer together, thereby adjusting the pitch of the luffing mechanism 2 and ensuring the stability of the device during operation. Optionally, the connecting group includes two connecting rods 7, one end of which is rotatably connected to a transition plate 9. The transition plate 9 is connected to the second pull plate 221 through a third pin.

[0039] In one embodiment, the boom 1 is provided with a guide mechanism, the guide mechanism including guide blocks 8 symmetrically arranged on the boom 1, and the guide blocks 8 are rotatably connected to the boom 1.

[0040] In use, when the mast and top boom approach each other, the balancing mechanism 22 drives the two first pull plates 211 to move away from each other, thereby adjusting the pitch of the luffing mechanism 2. At the same time, both first pull plates 211 are in contact with the guide block 8, which guides the first pull plates 211 and helps them move away from each other. When the mast returns to its original position, the guide block 8 also guides the first pull plates 211, helping them move closer together, and limits the luffing mechanism 2, ensuring the stability of the device during operation. The guide block 8 is rotatably connected to the boom 1. When the guide block 8 is not needed, it can be folded and erected when needed. Optionally, the guiding mechanism consists of two sets, which are respectively installed on the boom 1, and guide the first pull plates 211 through multiple guide blocks 8.

[0041] Example 2:

[0042] The present invention provides a crane, including the pitch self-adjusting luffing system described in any one of the embodiments.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pitch-adjustable variable amplitude system, characterized in that, It includes a boom (1) and a luffing mechanism (2) mounted on a crane, wherein the boom (1) is located on one side of the luffing mechanism (2); The luffing mechanism (2) includes a pull plate assembly (21), which includes two first pull plates (211). The two ends of the first pull plates (211) are symmetrically provided with transition pull plates (212). A telescopic mechanism is provided between two adjacent transition pull plates (212). The telescopic mechanism is used to adjust the distance between the two first pull plates (211). A balancing mechanism (22) is movably connected to the telescopic mechanism. One of the balancing mechanisms (22) is movably connected to the mast, and the other balancing mechanism (22) is movably connected to the top section of the boom (1). When the two balancing mechanisms (22) approach each other, the balancing mechanism (22) is used to drive the telescopic mechanism to extend. The length of the first pull plate (211) is greater than the length of the boom (1), and the maximum length of the telescopic mechanism is at least greater than the width of the boom (1), so that the luffing mechanism (2) can fall along the outside of the boom (1) to facilitate the assembly and disassembly of the luffing mechanism (2) on the ground. The telescopic mechanism includes a first core tube (3) and a second core tube (4) slidably connected to the first core tube (3). The first core tube (3) is provided with a first ear plate (5) at the end away from the second core tube (4), and the second core tube (4) is provided with a second ear plate (6) at the end away from the first core tube (3). The first ear plate (5) is connected to one of the adapter plates (212) located on the same side, and the second ear plate (6) is connected to the other adapter plate (212) located on the same side. The first ear plate (5) is connected to the adapter plate (212) via a first pin, and the second ear plate (6) is connected to the adapter plate (212) via a second pin; The first core tube (3) is located outside the second core tube (4), the length of the first core tube (3) is greater than the length of the second core tube (4), and the shortest length of the telescopic mechanism is equal to the length of the first core tube (3); The balancing mechanism (22) includes a second pull plate (221), and the two ends of the second pull plate (221) are symmetrically provided with a third pull plate (222) rotatably connected. One of the third pull plates (222) is rotatably connected to the first pin at the end away from the second pull plate (221), and the other third pull plate (222) is rotatably connected to the second pin at the end away from the second pull plate (221). The outer walls of the two second pull plates (221) are symmetrically provided with connecting groups on opposite sides. One of the connecting groups is rotatably connected to the mast, and the other connecting group is rotatably connected to the top arm. The length of the second pull plate (221) is less than the length of the first core tube (3).

2. The self-adjusting luffing system according to claim 1, characterized in that, The connecting group includes two connecting rods (7), one end of which is rotatably connected to a transition plate (9), and the transition plate (9) is connected to the second pull plate (221) through a third pin.

3. The self-adjusting luffing system according to claim 1, characterized in that, The boom (1) is provided with a guide mechanism, which includes guide blocks (8) symmetrically arranged on the boom (1) and the guide blocks (8) are rotatably connected to the boom (1).

4. The self-adjusting amplitude conversion system according to claim 3, characterized in that, The guiding mechanism consists of two sets, which are respectively installed on the boom (1).

5. The self-adjusting luffing system according to claim 1, characterized in that, It also includes a lifting mechanism for driving the luffing mechanism (2) to rise and fall.

6. A crane, characterized in that, Includes the automatic pitch adjustment variable amplitude system as described in any one of claims 1-5.

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