CN204569230U - A kind of hoisting crane and drawing cable mechanism thereof - Google Patents

Abstract

The utility model discloses a crane and a cable mechanism thereof, which can be matched with the transverse span of the boom frame of the crane so as to eliminate unbalanced loads. The cable mechanism includes a connecting plate, a pulley mounted on the connecting plate and a cable winding around the pulley, the pulleys include a first pulley and a second pulley respectively at two ends of the connecting plate, and both The transverse spacing between them matches the transverse span of the jib of the crane; the cable bypasses the first pulley and the second pulley, and is connected with the jib by its two extended ends. In the cable mechanism of the utility model, the force of the cable only generates component forces in the direction parallel to the boom and perpendicular to the boom, which eliminates the lateral partial load on the hinge point of the cable on the boom, and optimizes the tension of the cable. Use performance. At the same time, the contact area between the wire rope on the drag cable and the single pulley is reduced to prolong the service life of the wire rope; the drag force is borne by the two pulleys, so the stress of the single pulley is improved.

Description

A crane and its cable mechanism

technical field

The utility model relates to the technical field of cranes, in particular to a boom frame of a crane and a cable mechanism thereof.

Background technique

In construction machinery, the cable is the structure that transmits the pulling force, such as the cable used for the luffing of the small-tonnage crawler crane, the cable for auxiliary installation, etc. In actual work, its force can range from several tons to dozens of tons. , so the cable is an important part of construction machinery.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of the action form of the rear cable of the auxiliary arm of a crawler crane in the prior art.

Taking the crawler crane as an example, the cable mechanism of the crawler crane includes the main arm cable, the auxiliary arm cable and the tower arm cable. Further, the cable structure of the crawler crane will be described by taking the jib cable 100 as an example. The jib cable 100 is mainly used to connect the hinge point 200 of the main boom joint and the jib bracket 300, and is one of the main force-bearing components of the crawler crane. ,As shown in Figure 1. The traditional jib cable 100 mainly includes components such as a balance pulley 110 and a rope 120 wound around the balance pulley 110. The balance pulley 110 is connected to the jib bracket 300, and then connected to the hinge point 200 of the main jib joint at both ends of the rope 120. In order to realize the connection between the hinge point 200 of the main boom joint and the jib support 300 , the zipper force is transmitted.

Because in the process of force transmission, it is usually subjected to an eccentric load, so the structure that plays a role in balancing in the cable mechanism plays a crucial role, and the above-mentioned balance pulley belongs to the structure that plays a role in balancing.

Please further refer to FIG. 2 and FIG. 3 , FIG. 2 is a schematic structural diagram of a setting method of a balance beam in the prior art; FIG. 3 is a schematic structural view of a setting method of a balance pulley in the prior art.

In the crane, there are mainly two types of structures for balancing: the balance beam 400 and the balance pulley 500 .

As shown in Figure 2, the traditional balance beam 400 mainly includes components such as connecting plates, triangular plates, cables, and pulling plates, and the span is changed by adjusting the size of the connecting plates, triangular plates, and pulling plates to eliminate partial loads. role.

As shown in Figure 3, a traditional balance pulley 500 mainly includes a connecting plate 510, a pulley 520 and a dragline 530, and the dragline 530 is inserted into one end of the pulley 520 and stretched out from the other end of the pulley 520, so that the dragline 530 is slidably connected On the pulley 520 ; the pulley 520 can be connected with two connecting plates 510 through positioning pins, and the two connecting plates 510 are located on both sides of the pulley 520 so as to be connected with the jib bracket 300 and the like.

But above-mentioned two kinds of cable mechanisms all have certain drawbacks:

The balance beam 400 shown in Fig. 2 has a complex structure and high cost, and needs to be equipped with connecting plates, triangular plates, cables, pull plates and other structures; moreover, due to manufacturing precision problems, it is easy to cause uneven force on both sides of the balance beam 400 , leading to local stress concentration; at the same time, the required structural parts are heavy, which easily affects the lifting performance of the crane.

Although the balance pulley 500 shown in Figure 3 has a light structure, it is mainly stressed by the steel wire rope, and the force on both sides is uniform; however, since the pulling forces on the pulley 530 on both sides of the pulley 520 are at an angle to each other, so that the pulling force of the pulley 530 The two ends match the hinge point 200 of the main boom joint, and the cable 530 is slid and wound on the pulley 520. The radial width of the pulley 520 is limited, and it is impossible to match the horizontal span of the boom, so the cable force must be on the boom. The frame produces a lateral component force, that is, it is easy to generate a lateral force on the cable hinge point of the top section arm in the main arm (as shown in Figure 1), and then cause structural damage. At the same time, the pulley 530 surrounds a single pulley 520, and has a larger contact area with the pulley 520, thereby reducing the force limit of the pulley 530, and generally can only be used for small-tonnage products.

In view of this, it is urgent to address the above technical problems, optimize the design of the cable mechanism in the prior art, solve the problems of large partial load and easy damage to structural parts, and improve the force limit, while having a simple structure and light weight The advantages.

Utility model content

The purpose of the utility model is to provide a crane and its cable mechanism, which can match the horizontal span of the boom frame of the crane, thereby eliminating the unbalanced load.

In order to solve the above technical problems, the utility model provides a cable mechanism of a crane, which includes a connecting plate, a pulley mounted on the connecting plate and a cable winding around the pulley, and the pulleys include The first pulley and the second pulley at both ends, and the transverse spacing between them matches the transverse span of the crane jib; the cable goes around the first pulley and the second pulley, The protruding end is connected with the boom.

In the cable mechanism of the present utility model, pulleys are respectively arranged at both ends of the connecting plate, and the transverse distance between the two pulleys matches the transverse span of the boom frame of the crane, and then the acting direction of the cable force is adjusted so that the cable The force only produces component force in the direction parallel to the jib and perpendicular to the jib, which eliminates the lateral partial load force on the hinge point of the cable on the jib and optimizes the performance of the cable. Simultaneously, because the stay cable goes around two pulleys, compared with the connection method in which the stay cable is wound on one pulley in the prior art, the contact area between the steel wire rope on the stay cable and a single pulley is reduced, thereby prolonging the length of the steel wire rope. service life; the cable force is borne by two pulleys, so the force of a single pulley is improved, and the performance of the pulley is obviously improved; compared with the balance beam in the prior art, the cable mechanism of the utility model contains There are fewer components, the structure is simpler, and the cables on both sides are flexibly connected by pulleys, so that the force is more uniform.

Optionally, the first pulley is the same as the second pulley.

Optionally, the connecting plate has a connecting hole for connecting the sub-arm support/main arm support/tower arm support.

Optionally, the protruding end is provided with a connecting head for connecting the boom.

Optionally, at least one pair of installation positions for installing the pulley is provided on the connecting plate, and the transverse distance between each pair of the installation positions is set according to the transverse span of the jib of the crane.

Optionally, the connecting plate is in the shape of an isosceles trapezoid, and each pair of installation positions is respectively arranged at two ends of its lower side; a through hole is formed in the middle of the connecting plate.

The utility model also provides a crane, including a main arm cable, a secondary arm cable and a tower arm cable, and the main arm cable, secondary arm cable and tower arm cable all adopt the Cable mechanism.

Optionally, the crane is specifically a crawler crane.

Since the crane of the present invention includes the cable mechanism described in any one of the above, the technical effects produced by any of the above cable mechanisms are applicable to the crane of the present utility model, and will not be repeated here.

Description of drawings

Fig. 1 is a schematic diagram of the action form of the rear cable of the jib of a crawler crane in the prior art;

Fig. 2 is a structural schematic diagram of a setting method of a balance beam in the prior art;

Fig. 3 is a structural schematic diagram of a setting method of a balance pulley in the prior art;

Fig. 4 is a schematic structural view of the cable mechanism of the present invention in a specific embodiment;

Fig. 5 is a partially enlarged schematic diagram of the connection plate part of the cable mechanism shown in Fig. 4 .

In Figure 1-3:

Jib cable 100, balance pulley 110, rope 120, main boom joint hinge point 200, jib bracket 300, balance beam 400, balance pulley 500, connecting plate 510, pulley 520, cable 530

In Figure 4-5:

Connecting plate 1, connecting hole 11, installation position 12, through hole 13, cable 2, extension end 21, connecting head 211, first pulley 3, second pulley 4

Detailed ways

The core of the utility model is to provide a crane and its cable mechanism, which can be matched with the horizontal span of the boom of the crane, thereby eliminating unbalanced loads.

In order to make those skilled in the art better understand the technical solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Fig. 4 and Fig. 5, the cable mechanism of the present utility model is used for cranes, especially for crawler cranes. The horizontal spans of the booms are matched to effectively eliminate unbalanced loads.

In detail, the cable mechanism may include a connecting plate 1, a pulley and a cable 2, the connecting plate 1 is used to connect with the sub-arm support or the main arm support or the tower arm support; the pulley is installed on the connecting plate 1, and then the pulling The cable 2 is wound on the pulley, and the two ends of the cable 2 are connected with the jib to transmit the force of the cable. In the present utility model, the pulley can include a first pulley 3 and a second pulley 4, both of which are respectively installed on the two ends of the connecting plate 1, and the transverse spacing between the two can match the transverse span of the crane jib; The stay cable 2 can go around the first pulley 3 and the second pulley 4, and stretch out with its two ends to form two protruding ends 21 on one side of the first pulley 3 and one side of the second pulley 4 , and then connected with the boom with its extended end 21. When the connecting plate 1 is connected with the corresponding jib bracket/main jib bracket/tower jib bracket, as the jib bracket/main jib bracket/tower jib bracket rises and falls, the cable 2 is tensioned or relaxed to lift or release the jib frame, and then assist the crane to work through the adjustment of the zipper force.

Wherein, words such as first and second described herein are only used to distinguish different components with the same or similar structure, and do not represent any special restriction on the order. Matching the lateral spacing between the first pulley 3 and the second pulley 4 with the lateral span of the crane means that the lateral spacing between the two pulleys is equal to the lateral span of the crane; or, when the lateral spacing between the two pulleys In a certain range, after the two protruding ends 21 of the cable 2 are connected to the jib, the force of the cable will basically not generate an eccentric load force in the transverse direction of the connection point, that is, the force of the cable is in the plane where the connection point is located. Of course, when the cable mechanism is applied to different jibs, the transverse span is the transverse span of the corresponding jib.

The transverse direction mentioned herein refers to the width direction of the boom, or in other words, the direction perpendicular to the extension direction of the boom in the plane where the boom is located.

Further, when the transverse spacing between the first pulley 3 and the second pulley 4 matches the transverse span of the jib, the contact area between the cable 2 and the first pulley 3 is usually equal to the area of the ring of the first pulley 3 1/4; Similarly, the contact area of dragline 2 and the second pulley 4 can also be equal to 1/4 of the area of the second pulley 4 rings, as shown in Figure 5; wherein said first pulley 3 and The annular area of the second pulley 4 refers to the area of the annular groove of the steel wire rope used for installing the stay cable 2 .

With the above structure, on the one hand, the first pulley 3 and the second pulley 4 can effectively guide the cable 2, so that the cable 2 can match the lateral span of the jib, and eliminate the partial load force on the jib; Simultaneously, the first pulley 3 and the second pulley 4 can effectively support the dragline 2 and bear the dragline force, so that the force of a single pulley is significantly reduced, which improves the stress situation of the pulley; since the dragline 2 and the first pulley 3 The contact area with the second pulley 4 is small, which reduces the friction between the pulley 2 and the pulley, thereby prolonging the service life of the pulley 2 .

Furthermore, the first pulley 3 and the second pulley 4 can adopt the same structure, and can also be different, for example, the radius of the two, the area of the ring, etc. can be set differently, and different materials can also be used, so that the two Adjust accordingly to the strength of the patient. Of course, in order to ensure that the force on both sides of the boom is balanced, it is necessary to use the flexible direction of the cable 2 to keep the force on both sides of the boom always equal. Therefore, in order to cooperate with the cable 2, the stress angle Adjustment, the first pulley 3 and the second pulley 4 can be the same, also can be slightly different in size and so on.

In detail, as shown in Figure 5, a connecting hole 11 can be provided on the connecting plate 1 for connecting the sub-arm support/main arm support/tower arm support, so as to realize the installation of the cable mechanism and apply the cable force to the boom , to realize the connection between the main arm, the auxiliary arm and the tower arm.

At the same time, a connector 211 can also be provided at the extended end 21 of the drag cable 2 for connecting with the jib, specifically with the auxiliary arm/main arm/tower arm, as shown in Figure 4; wherein, the connection method It can be hinged so as to adjust the direction and size of the cable force. The connecting head 211 can be specifically arranged as a U-shaped structure, and through holes are set on both side walls, and hinge holes can also be set on the arm frame, and then the through holes and hinge holes are passed through connecting parts such as pin shafts, and then the The connecting head 211 is hinged with the boom.

On the basis of the above, at least one pair of installation positions 12 for installing pulleys can also be provided on the connecting plate 1, and the transverse spacing of each pair of installation positions 12 is set according to the transverse span of the jib of the crane. Obviously, when the applicable jibs are different or the models of the cranes are different, the transverse span should be adjusted accordingly. horizontal span.

In other words, the installation positions 12 can be paired in pairs, that is, a pair of installation positions 12 can include two installation positions 12 for respectively installing the first pulley 3 and the second pulley 4; it can be the first pulley 3 and the second pulley 4. Set two or more installation positions 12 to change the installation positions 12 of the two, and then can match different types of cranes or jibs of different structures, expanding the scope of application of the cable mechanism of the present utility model.

In addition, the structure of the connecting plate 1 is not limited, it can be an isosceles trapezoid or other symmetrical structures, and can also be other asymmetrical structures, as long as the installation positions 12 of the first pulley 3 and the second pulley 4 can be formed. Specifically, when the connecting plate 1 is arranged as an isosceles trapezoid, installation positions 12 for installing the first pulley 3/second pulley 4 can be set at the two ends of its lower side, so that the first pulley 3 and the second pulley 4 are about The center line of the isosceles trapezoid is symmetrical, so that the forces acting on the lateral sides of the jib remain balanced. Apparently, the installation positions 12 of the first pulley 3 and the second pulley 4 can also be arranged asymmetrically, and specifically can be adjusted according to the lateral span of the jib.

A through hole 13 can also be set in the middle of the connecting plate 1, so as to reduce its weight and reduce the load of the crane.

When the connecting plate 1 is set to an isosceles trapezoidal structure, the connecting hole 11 can also be arranged on it for connecting with the auxiliary arm bracket/main arm bracket/tower arm bracket; the number of connecting holes 11 can be adjusted according to needs Setting, in the embodiment shown in Fig. 5, two connecting holes 11 can be set, and the two connecting holes 11 are respectively located at the two ends of the upper side of the connecting plate 1, so as to connect with the two ends of the auxiliary arm bracket/main arm bracket/tower arm bracket hinged.

In addition, the first pulley 3 and the second pulley 4 can be rotatably connected to the connecting plate 1 through a connecting piece such as a pin shaft, so that the first pulley 3 and the second pulley 4 can rotate around the hinge axis, and then adjust the cable 2, As shown in Figure 5.

The utility model further provides a crane, specifically a crawler crane, including a jib cable, a main arm cable and a tower arm cable; wherein, the secondary arm cable, the main arm cable and the tower arm cable The above-mentioned cable mechanism can be used to eliminate the eccentric load exerted by the cable force on the connection point of the cable 2 on the jib, so as to optimize the performance of the crane.

It should be noted that the crane contains many parts, and the structure of each part is relatively complicated, and the connection mode of the jib and the function form of the cable 2 are set differently according to the needs, so they will not be described here one by one. Please refer to the prior art for details.

The crane and its cable mechanism provided by the utility model have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present utility model, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made to the utility model, and these improvements and modifications also fall into the protection of the claims of the utility model. within range.

Claims (8)

1. the drawing cable mechanism of a hoisting crane, comprise connecting panel (1), be arranged on pulley on described connecting panel (1) and be wound around the drag-line (2) of described pulley, it is characterized in that, described pulley comprises the first pulley (3) and the second pulley (4) that are in described connecting panel (1) two ends respectively, and transverse pitch between the two mates with the horizontal span of crane arm support; Described drag-line (2) walks around described first pulley (3) and described second pulley (4), and is connected with jib with its two external part (21).

2. drawing cable mechanism as claimed in claim 1, it is characterized in that, described first pulley (3) is identical with described second pulley (4).

3. drawing cable mechanism as claimed in claim 1, it is characterized in that, described connecting panel (1) has the connecting bore (11) for auxiliary connection arm support or principal arm support or tower arm support.

4. drawing cable mechanism as claimed in claim 1, it is characterized in that, described external part (21) is provided with the connector (211) for connecting jib.

5. the drawing cable mechanism as described in any one of claim 1-4, it is characterized in that, described connecting panel (1) is provided with at least one pair of for installing the installation position (12) of described pulley, and each transverse pitch to described installation position (12) is arranged according to the horizontal span of crane arm support.

6. drawing cable mechanism as claimed in claim 5, is characterized in that, described connecting panel (1), in isosceles trapezoid, is respectively separately positioned on its following two ends to described installation position (12); The centre of described connecting panel (1) has through hole (13).

7. a hoisting crane, comprises principal arm drag-line, auxiliary drag-line and tower arm drag-line, it is characterized in that, described principal arm drag-line, auxiliary drag-line and tower arm drag-line all adopt the drawing cable mechanism described in any one of the claims 1-6.

8. hoisting crane as claimed in claim 7, it is characterized in that, described hoisting crane is specially crawler crane.