Adjustable balance arm structure of crane

Abstract

The adjustable balance arm structure of the crane comprises a balance arm, wedge-shaped connector assemblies are hinged to the two ends of the balance arm respectively, a buffer is arranged between the two wedge-shaped connector assemblies, and a steel wire rope bypasses the wedge-shaped connector assemblies and is fixed through a rope buckle; the middle of the balance arm is rotationally connected with the connecting base through a first pin shaft, and the connecting base is rotationally connected with the upper base through a second pin shaft. The wedge-shaped connector assembly comprises two lug plates, a positioning block and a fixed block are arranged between the two lug plates, the fixed block is provided with a channel, a spring is inserted into the channel, one end of the spring is connected with a movable block, the other end of the spring is connected with a pressing block, the movable block is pressed downwards when the steel wire rope is stressed, and the movable block enables the pressing block to press the steel wire rope on the positioning block through the spring. The problem that the rope end of the steel wire rope is folded due to height change is solved, operation stability is improved, vibration energy caused by sudden tension change or impact load of the steel wire rope can be absorbed, dynamic clamping of the steel wire rope is achieved, and connection reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cranes, in particular to an adjustable balance arm structure of a crane. BACKGROUND

[0002] In a bridge crane, a gantry crane and other hoisting equipment, the balance arm is an important component of the trolley running mechanism, mainly used for balancing the lifting load, stabilizing the hook position, and transmitting the wire rope tension, which plays a key role in the smoothness and safety of the whole machine operation. The traditional balance arm is mostly directly connected with the base, and the balance arm and the base are connected by a pin shaft. The hook is lifted from the bottom to the top, and the wire rope will change the angle with the balance arm with the change of height, causing the wire rope to have a crease phenomenon, and the bending moment is generated at the connection between the balance arm and the wire rope, which is not a pure tensile shear force. This phenomenon is not conducive to the stress of the wire rope and the balance arm, causing safety hazards. In addition, the existing connection mode of the balance arm and the wire rope usually relies on a fixed wedge connector or a rope buckle. This kind of structure is prone to slip after the wire rope is stressed, and the clamping reliability is insufficient. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the existing defects and provide an adjustable balance arm structure of a crane, which solves the problem of crease of the wire end of the wire rope due to change of height, improves the running smoothness, can absorb the vibration energy caused by sudden change of wire rope tension or impact load, realizes dynamic clamping of the wire rope, improves the connection reliability, and can effectively solve the problems in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an adjustable balance arm structure of a crane, comprising a balance arm, wedge connector assemblies are hinged at both ends of the balance arm, a buffer is arranged between the two wedge connector assemblies, and a wire rope passes through the wedge connector assemblies and is fixed by a rope buckle; the middle part of the balance arm is rotationally connected with a connecting seat through a pin shaft one, the connecting seat is rotationally connected with an upper seat through a pin shaft two, the pin shaft one and the pin shaft two are perpendicular to each other, and the upper seat is fixedly connected with a crane trolley through a lower seat. The wedge connector assembly comprises two ear plates, a positioning block and a fixed block are arranged between the two ear plates, the fixed block has an L-shaped channel, a spring is inserted into the channel, one end of the spring is connected with a movable block, the other end of the spring is connected with a pressing block, the wire rope passes through the movable block and the pressing block and the positioning block, the wire rope presses down the movable block when stressed, and the movable block makes the pressing block press the wire rope on the positioning block through the spring.

[0005] Preferably, the movable block has a semi-circular structure with an arc-shaped groove adapted to the wire rope, and the movable block is provided with a guide post that is adapted to one side opening of the channel; the pressure block has a columnar structure with a groove adapted to the wire rope, and the pressure block is adapted to the other side opening of the channel; the two ends of the spring are respectively sleeved with the guide post and the pressure block.

[0006] Preferably, the positioning block has a groove adapted to the wire rope.

[0007] Preferably, the two ear plates are fixedly connected by a plurality of bolt and nut assemblies, and the positioning block and the fixing block are both fixed between the two ear plates by bolt and nut assemblies, and the positioning block and the fixing block are both provided with through holes for the bolt and nut assemblies to pass through.

[0008] Preferably, the upper seat is connected to the lower seat by a bolt and nut assembly. The part of the upper seat that protrudes from the lower seat has a downward-facing mounting groove. The connecting seat is installed in the mounting groove by a second pin. A baffle is provided at one end of the second pin that extends out of the side wall of the upper seat.

[0009] Preferably, the inner walls on both sides of the mounting groove are provided with wear-resistant bushings, and the second pin is adapted to the wear-resistant bushings.

[0010] Preferably, the lower part of the connecting seat has a through groove, and the balance arm is installed in the through groove by a pin. A baffle is provided at one end of the pin that extends out of the side wall of the connecting seat.

[0011] Preferably, the balance arm is provided with a wear-resistant bushing adapted to the pin, and a positioning sleeve is provided between the side wall of the balance arm and the inner wall of the connecting seat.

[0012] Preferably, the buffer is a spring, with its two ends hinged to two wedge-shaped joint assemblies respectively.

[0013] Compared with the prior art, the beneficial effects of the present invention are: (1) The balance arm is rotatably connected to the connecting seat through pin one, and the connecting seat is rotatably connected to the upper seat through pin two. The balance arm can achieve adaptive adjustment in multiple degrees of freedom. As the height changes, the balance arm will rotate. The rope end and the balance arm are only subjected to tensile and shear forces, which solves the problem of wire rope creases due to height changes. (2) A buffer is set between the two wedge joint assemblies to absorb the vibration energy caused by sudden changes in wire rope tension or impact load, thereby reducing the impact on the balance arm and the whole structure. (3) The wedge joint assembly is equipped with a linkage mechanism between a movable block and a pressure block driven by a spring. When the wire rope is under force, the movable block presses down and transmits the pressure through the spring, so that the pressure block firmly presses the wire rope onto the positioning block, thereby realizing dynamic clamping of the wire rope. This not only prevents the wire rope from slipping, but also automatically adjusts the clamping force according to the tension, thereby improving the reliability of the connection. Attached Figure Description

[0014] Figure 1 This is a side view of the present invention; Figure 2 This is a cross-sectional view (AA) of the present invention; Figure 3 This is a BB cross-sectional view of the present invention; Figure 4 This is a front view of the present invention; Figure 5 This is a schematic diagram of the wedge-shaped joint assembly structure of the present invention; Figure 6 for Figure 5 A magnified schematic diagram of a local structure; Figure 7 This is a schematic diagram of a traditional balance arm.

[0015] In the diagram: 1 Lower seat, 2 Upper seat, 3 Pin 2, 4 Connecting seat, 5 Balance arm, 6 Pin 1, 7 Buffer, 8 Wedge joint assembly, 8.1 Ear plate, 8.2 Positioning block, 8.3 Movable block, 8.4 Spring, 8.5 Channel, 8.6 Fixing block, 8.7 Pressure block, 8.8 Guide post. Detailed Implementation

[0016] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0017] Please see Figures 1-7 The present invention provides the following technical solutions: Example 1: An adjustable counterweight boom structure for a crane includes a counterweight boom 5. Both ends of the counterweight boom 5 are hinged with wedge-shaped joint assemblies 8. A buffer 7, which is a spring, is provided between the two wedge-shaped joint assemblies 8. The two ends of the spring are respectively hinged to the two wedge-shaped joint assemblies 8. A wire rope passes around the wedge-shaped joint assemblies 8 and is fixed by a rope buckle. The buffer 7 between the two wedge-shaped joint assemblies 8 can absorb the vibration energy caused by sudden changes in wire rope tension or impact loads, reducing the impact on the counterweight boom 5 and the overall structure. The middle part of the counterweight boom 5 is rotatably connected to a connecting seat 4 via a pin 6. Connector 4 is rotatably connected to upper seat 2 via pin 2 3. Pin 1 6 and pin 2 3 are perpendicular to each other. Upper seat 2 is fixedly connected to crane trolley via lower seat 1. Balance arm 5 is rotatably connected to connecting seat 4 via pin 1 6. Connector 4 is rotatably connected to upper seat 2 via pin 2 3. Balance arm 5 can rotate left and right as well as forward and backward, with multiple degrees of freedom. It adaptively adjusts according to the position of wire rope. That is, as the height of the connection end of wire rope and wedge joint assembly 8 changes, balance arm 5 will rotate. The rope end and balance arm 5 are only subjected to tensile and shear forces, which solves the problem of wire rope creases due to height changes. Specifically, the wedge joint assembly 8 includes two ear plates 8.1, with a positioning block 8.2 and a fixing block 8.6 between the two ear plates 8.1. The fixing block 8.6 has an L-shaped channel 8.5, in which a spring 8.4 is inserted. One end of the spring 8.4 is connected to a movable block 8.3, and the other end of the spring 8.4 is connected to a pressure block 8.7. The wire rope passes around the movable block 8.3 and through the pressure block 8.7 and the positioning block 8.2. When the wire rope is under force, it presses down on the movable block 8.3. The movable block 8.3, through the spring 8.4, causes the pressure block 8.7 to press the wire rope onto the positioning block 8.2. The positioning block 8.2 has a groove that fits the wire rope, allowing it to contact the wire rope well. Anti-slip textures can be provided in the groove. It is understandable that the wedge joint assembly 8 has a linkage mechanism between the movable block 8.3 driven by the spring 8.4 and the pressure block 8.7. When the wire rope is under force, the movable block 8.3 presses down and transmits the pressure through the spring 8.4, so that the pressure block 8.7 presses the wire rope tightly onto the positioning block 8.2, realizing dynamic clamping of the wire rope. This not only prevents the wire rope from slipping, but also automatically adjusts the clamping force according to the tension, further improving the reliability of the connection.

[0018] Example 2: Unlike Example 1, the movable block 8.3 has a semi-circular structure with an arc-shaped groove adapted to the wire rope, increasing the contact area with the wire rope. The movable block 8.3 is equipped with a guide post 8.8, which is adapted to one side opening of the channel 8.5. The pressure block 8.7 has a columnar structure with a groove adapted to the wire rope, making good contact with the wire rope. Anti-slip texture can be set in the groove. The pressure block 8.7 is adapted to the other side opening of the channel 8.5. The two ends of the spring 8.4 are respectively sleeved with the guide post 8.8 and the pressure block 8.7. The movable block 8.3 presses down on the spring 8.4 through the guide post 8.8, and the spring 8.4 then transmits the pressure to the pressure block 8.7, which becomes the fastening force between the pressure block 8.7 and the wire rope. As the wire rope bears the weight, the greater the tension of the wire rope, the better the fastening effect.

[0019] Example 3: Unlike Example 1, the two ear plates 8.1 are fixedly connected by multiple bolt and nut sets. The positioning block 8.2 and the fixing block 8.6 are both fixed between the two ear plates 8.1 by bolt and nut sets. The positioning block 8.2 and the fixing block 8.6 are provided with through holes for the bolt and nut sets to pass through. The two ear plates 8.1, the positioning block 8.2 and the fixing block 8.6 are connected by bolt and nut sets, which facilitates disassembly and installation.

[0020] Example 4: Unlike Example 1, the upper seat 2 is connected to the lower seat 1 by a bolt and nut assembly. The part of the upper seat 2 that protrudes from the lower seat 1 has a downward-facing mounting groove. The connecting seat 4 is installed in the mounting groove by a second pin 3. The connecting seat 4 and the second pin 3 form a vertical hinge pair, allowing the balance arm 5 to rotate freely vertically around the second pin 3. A baffle is provided at one end of the second pin 3 that protrudes from the side wall of the upper seat 2 to prevent the second pin 3 from coming out. Wear-resistant bushings are provided on both sides of the mounting groove. The second pin 3 is adapted to the wear-resistant bushings, which greatly reduces friction and wear during rotation, reduces maintenance frequency, and improves the stability and durability of the equipment during long-term operation.

[0021] Example 5: Unlike Example 1, the lower part of the connecting seat 4 has a through groove. The balance arm 5 is installed in the through groove through a pin 6. The through groove and the pin 6 form a horizontal hinge pair, allowing the balance arm 5 to rotate freely around the pin 6 in the horizontal plane. A baffle is provided at the end of the pin 6 that extends out of the side wall of the connecting seat 4 to prevent the pin 6 from coming out. The balance arm 5 is provided with a wear-resistant bushing that matches the pin 6. A positioning sleeve is provided between the side wall of the balance arm 5 and the inner wall of the connecting seat 4, which greatly reduces friction and wear during rotation, reduces maintenance frequency, and improves the stability and durability of the equipment during long-term operation.

[0022] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to encompass all changes falling within the meaning and scope of equivalents in the content of this invention.

Claims

1. An adjustable counterweight boom structure for a crane, comprising a counterweight boom (5), characterized in that: Both ends of the balance arm (5) are hinged with wedge joint assemblies (8), and a buffer (7) is provided between the two wedge joint assemblies (8). The wire rope passes around the wedge joint assembly (8) and is fixed by a rope buckle. The middle part of the balance arm (5) is rotatably connected to the connecting seat (4) through a first pin (6). The connecting seat (4) is rotatably connected to the upper seat (2) through a second pin (3). The axes of the first pin (6) and the second pin (3) are perpendicular to each other. The upper seat (2) is fixedly connected to the crane trolley through the lower seat (1). The wedge-shaped joint assembly (8) includes two ear plates (8.1), with a positioning block (8.2) and a fixing block (8.6) between the two ear plates (8.1). The fixing block (8.6) has an L-shaped channel (8.5), in which a spring (8.4) is inserted. One end of the spring (8.4) is connected to a movable block (8.3), and the other end of the spring (8.4) is connected to a pressure block (8.7). The wire rope passes around the movable block (8.3) and through the pressure block (8.7) and the positioning block (8.2). When the wire rope is under force, it presses down on the movable block (8.3). The movable block (8.3) uses the spring (8.4) to make the pressure block (8.7) press the wire rope onto the positioning block (8.2).

2. The adjustable counterweight boom structure for a crane according to claim 1, characterized in that: The movable block (8.3) has a semi-circular structure and an arc-shaped groove adapted to the wire rope. The movable block (8.3) is provided with a guide post (8.8), which is adapted to one side opening of the channel (8.5). The pressure block (8.7) has a columnar structure and a groove adapted to the wire rope. The pressure block (8.7) is adapted to the other side opening of the channel (8.5). The two ends of the spring (8.4) are respectively sleeved with the guide post (8.8) and the pressure block (8.7).

3. The adjustable counterweight boom structure for a crane according to claim 1, characterized in that: The positioning block (8.2) has a groove adapted to the wire rope.

4. The adjustable counterweight boom structure for a crane according to claim 1, characterized in that: The two ear plates (8.1) are fixedly connected by a plurality of bolt and nut groups. The positioning block (8.2) and the fixing block (8.6) are both fixed between the two ear plates (8.1) by bolt and nut groups. The positioning block (8.2) and the fixing block (8.6) are both provided with through holes for the bolt and nut groups to pass through.

5. The adjustable counterweight boom structure for a crane according to claim 1, characterized in that: The upper seat (2) is connected to the lower seat (1) by a bolt and nut assembly. The part of the upper seat (2) that protrudes from the lower seat (1) has a downward-facing mounting groove. The connecting seat (4) is installed in the mounting groove by a pin (3). A baffle is provided at one end of the pin (3) that extends out of the side wall of the upper seat (2).

6. The adjustable counterweight boom structure for a crane according to claim 5, characterized in that: The inner walls on both sides of the mounting groove are provided with wear-resistant bushings, and the pin shaft 2 (3) is adapted to the wear-resistant bushings.

7. The adjustable counterweight boom structure for a crane according to claim 1, characterized in that: The lower part of the connecting seat (4) has a through groove, and the balance arm (5) is installed in the through groove by a pin (6). A baffle is provided at one end of the pin (6) that extends out of the side wall of the connecting seat (4).

8. The adjustable counterweight boom structure for a crane according to claim 7, characterized in that: The balance arm (5) is provided with a wear-resistant bushing that is adapted to the pin (6), and a positioning sleeve is provided between the side wall of the balance arm (5) and the inner wall of the connecting seat (4).

9. The adjustable counterweight boom structure for a crane according to claim 1, characterized in that: The buffer (7) is a spring, and the two ends of the spring are respectively hinged to two wedge joint assemblies (8).

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