Counterweight lifting mechanism and crane with same

Abstract

A balance weight lifting mechanism is installed on the rear section of a rotary table of a crane and used for lifting balance weight, the balance weight lifting mechanism comprises a balance weight lifting support and a balance weight lifting oil cylinder, the balance weight lifting oil cylinder is fixed to the balance weight lifting support, and rolling assemblies are installed at the bottom and the top of the balance weight lifting support. The balance weight lifting support is installed on the rotary table rear section through a rolling assembly, and the rolling assembly rolls on the rotary table rear section so that the balance weight lifting support can slide in the direction close to or away from the rotation center of the rotary table. The rolling assemblies are arranged at the moving contact positions of the balance weight lifting support and the rear section of the rotary table, friction resistance is greatly reduced, when the position of the balance weight lifting oil cylinder needs to be changed, only the balance weight lifting support needs to be pushed manually, an additional driving mechanism does not need to be arranged to push the balance weight lifting support to move, and operation is convenient. And the working efficiency of switching different working conditions of the crane is greatly improved. The utility model further provides a crane with the counterweight lifting mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a counterweight lifting mechanism for a crane with variable-position counterweights and a crane with the counterweight lifting mechanism. Background Art

[0002] At present, truck cranes mainly obtain different counterweight center-of-gravity positions by increasing fixed counterweights and moving the positions of the counterweights, so as to obtain the required lifting performance, that is, the balance moment, in order to achieve the working performance of the crane adapted to various working sites.

[0003] The method of obtaining different lifting performances by increasing fixed counterweights usually adds counterweights at the rear of the whole vehicle to obtain a greater lifting capacity, that is, the balance moment. In this case, the center of gravity of the crane when it is unloaded is shifted backward, resulting in a larger difference in the front and rear axle loads of the crane, reducing the stability of the whole vehicle; and adding counterweights at the rear of the turntable will increase the total length of the crane, resulting in an increase in the working radius, which will limit the range of working sites suitable for the crane, and adding counterweights will increase the transportation cost, and auxiliary cranes are required for installation, and self-loading and unloading cannot be achieved, affecting the working efficiency.

[0004] For the method of obtaining different lifting performances by moving the position of the counterweight, at present, the counterweight lifting mechanisms for realizing counterweight displacement include a telescopic mechanism type and a connecting rod type, and different counterweight center-of-gravity positions are obtained by changing the position of the counterweight. Among them, the telescopic mechanism type has a large and redundant structure, including a telescopic oil cylinder, a main frame and a displacement frame, which affects the weight and axle load of the whole crane, occupies the space where the counterweight can be arranged under the turntable, resulting in an increase in the counterweight density and an increase in the counterweight cost. The connecting rod type structure is also large and redundant in structure, occupies the space where the counterweight can be arranged under the turntable, increases the counterweight density and increases the counterweight cost. At the same time, the stability of the connecting rod structure is poor and the safety during work cannot be ensured.

[0005] The counterweight lifting mechanism is a key component for a crane to change the position of the counterweight. It is applied to scenarios where the working site changes and the lifting performance requirements are different. The portability and stability of its structure directly affect the working efficiency of the crane when switching different working conditions. Therefore, it is necessary to improve the existing counterweight lifting mechanism. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a counterweight lifting mechanism and a crane, which can obtain the required lifting performance by changing the position of the counterweight without increasing the fixed counterweight, reduce the counterweight cost, and lift the counterweights at multiple positions by adjusting the position of the oil cylinder to meet the requirements of different working sites, without affecting the stability and normal operation of the equipment.

[0007] To achieve the above purpose, the technical solution of the utility model is realized as follows:

[0008] The utility model provides a counterweight lifting mechanism, which is installed at the rear section of the rotary table of a crane and used for lifting the counterweight. The counterweight lifting mechanism includes a counterweight lifting bracket and a counterweight lifting oil cylinder. The counterweight lifting oil cylinder is fixed on the counterweight lifting bracket. Rolling components are installed at both the bottom and the top of the counterweight lifting bracket. The counterweight lifting bracket is installed on the rear section of the rotary table through the rolling components, and the counterweight lifting bracket slides in a direction close to or away from the rotation center of the rotary table by rolling on the rear section of the rotary table through the rolling components.

[0009] Specifically, in this embodiment, the rolling components are roller shafts, rollers or balls.

[0010] Specifically, in this embodiment, the number of the counterweight lifting brackets is two, and the two counterweight lifting brackets are respectively arranged on opposite sides of the rear section of the rotary table.

[0011] Specifically, in this embodiment, a guiding mechanism is further provided on the rear section of the rotary table and the counterweight lifting bracket. The guiding mechanism includes a slide rail and a slide groove. The slide rail is arranged on one of the rear section of the rotary table and the counterweight lifting bracket, and the slide groove is arranged on the other of the rear section of the rotary table and the counterweight lifting bracket.

[0012] Specifically, in this embodiment, an upper extension plate and a lower extension plate are arranged at any one side position of opposite sides of the rear section of the rotary table. The upper extension plate extends outward from the top of the rear section of the rotary table, and the lower extension plate extends outward from the bottom of the rear section of the rotary table. The counterweight lifting bracket is installed between the upper extension plate and the lower extension plate of the rear section of the rotary table.

[0013] Specifically, in this embodiment, a baffle is protrudingly arranged on the lower surface of the upper extension plate towards the lower extension plate. The rolling component at the top of the counterweight lifting bracket contacts and rolls on the inner surface of the baffle.

[0014] A support plate is arranged on the upper surface of the lower extension plate. The rolling component at the bottom of the counterweight lifting bracket contacts and rolls on the upper surface of the support plate.

[0015] Specifically, in this embodiment, the support plate and the slide rail are integrally formed into an L-shaped structure, wherein the support plate is parallel to and stacked with the lower extension plate up and down, and the slide rail is perpendicular to the lower extension plate.

[0016] Specifically, in this embodiment, the axis of the rolling component at the bottom of the counterweight lifting bracket is in the horizontal direction, and the axis of the rolling component at the top of the counterweight lifting bracket is in the vertical direction, so that the rolling component at the bottom of the counterweight lifting bracket is perpendicular to the rolling component at the top of the counterweight lifting bracket.

[0017] Specifically, in this embodiment, the counterweight lifting mechanism further includes a first limiting mechanism disposed at the bottom of the counterweight lifting bracket. After the counterweight lifting bracket slides to a preset position on the rear section of the turntable, the first limiting mechanism is used to limit and lock the counterweight lifting bracket at this position;

[0018] The counterweight lifting mechanism further includes a second limiting mechanism disposed at the top of the counterweight lifting bracket. After the counterweight lifting bracket slides to a preset position on the rear section of the turntable, the second limiting mechanism is also used to limit and lock the counterweight lifting bracket at this position.

[0019] The present utility model also provides a crane, including a rear section of a turntable. The crane further includes the counterweight lifting mechanism described in this embodiment, and the counterweight lifting mechanism is installed on the rear section of the turntable.

[0020] The counterweight lifting mechanism provided by the present utility model includes a counterweight lifting bracket and a counterweight lifting oil cylinder. The counterweight lifting oil cylinder is fixed on the counterweight lifting bracket. Rolling components are installed at both the bottom and the top of the counterweight lifting bracket. The counterweight lifting bracket is slidably installed on the rear section of the turntable through the rolling components. When manually pushing the counterweight lifting bracket, the rolling components on the counterweight lifting bracket roll on the rear section of the turntable, causing the counterweight lifting bracket to slide on the rear section of the turntable and drive the counterweight lifting oil cylinder to move, so as to change the position of the counterweight lifting oil cylinder, enabling the counterweight lifting oil cylinder to lift the counterweight at different positions, realizing the function of lifting the counterweight at different positions. Thus, the crane can, through the counterweight lifting mechanism, complete obtaining different counterweight center-of-gravity positions by changing the counterweight position without increasing the fixed counterweight, so as to meet the requirements of different working sites, reducing the transportation cost. This counterweight lifting mechanism not only has a simple structure, but also rolling components are provided at the moving contact positions between the counterweight lifting bracket and the rear section of the turntable, greatly reducing the frictional resistance. When it is necessary to change the position of the counterweight lifting oil cylinder, only need to manually push the counterweight lifting bracket, then the counterweight lifting bracket can roll on the rear section of the turntable through the rolling components and drive the counterweight lifting oil cylinder to move synchronously, without the need to set up an additional driving mechanism to push the counterweight lifting bracket to move, greatly improving the working efficiency of the crane in switching different working conditions. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0022] Figure 1Schematic diagram of the overall structure of the counterweight lifting mechanism provided by an embodiment of the present utility model.

[0023] Figure 2 For Figure 1 Another schematic diagram of the counterweight lifting mechanism shown.

[0024] Figure 3 For Figure 1 Another schematic diagram of the counterweight lifting mechanism shown from different perspectives.

[0025] Figure 4 For Figure 1 Exploded view of the counterweight lifting bracket and the counterweight lifting oil cylinder in the counterweight lifting mechanism shown.

[0026] Figure 5 For Figure 1 Side view of the overall structure of the counterweight lifting mechanism shown.

[0027] Figure 6 For Figure 1 Top view of the overall structure of the counterweight lifting mechanism shown.

[0028] Figure 7 For Figure 1 One of the schematic diagrams of the counterweight lifting mechanism when lifting the counterweight shown.

[0029] Figure 8 For Figure 1 Another schematic diagram of the counterweight lifting mechanism when lifting the counterweight shown.

[0030] In the figure: 1, turntable; 101, rear section of the turntable; 2, slide rail; 201, first limiting hole; 202, chute; 203, installation groove; 204, weight reduction hole; 3, counterweight lifting bracket; 301, first jack; 302, second jack; 303, fixing hole; 4, counterweight lifting oil cylinder; 401, piston rod; 402, fastening plate; 403, fixing block; 404, through hole; 405, cylinder barrel; 5, upper extension plate; 501, second limiting hole; 502, baffle; 6, lower extension plate; 601, support plate; 7, rolling component; 701, U-shaped stop block; 702, sealing plate; 703, installation hole; 8, first limiting mechanism; 9, second limiting mechanism; 10, pin; 11, limiting plate; 12, counterweight; 13, mounting part; 14, opening; 15, engaging groove. Detailed implementation manners

[0031] The specific embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the description of the present utility model without making creative efforts shall fall within the scope of protection of the present utility model.

[0032] In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "set", "installed", "connected", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model is usually placed during use. It is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0034] Terms such as "first", "second", "third", etc. are only used to distinguish elements with similar attributes, rather than indicating or implying relative importance or a specific order.

[0035] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to the elements listed, it may also include other elements not specifically listed.

[0036] Such as Figures 1 to 8As shown in the figure, a preferred embodiment of the present utility model provides a counterweight lifting mechanism, which is installed at the rear section 101 of the turntable of a crane and is used to lift the counterweight. The counterweight lifting mechanism includes a counterweight lifting bracket 3 and a counterweight lifting oil cylinder 4. The counterweight lifting oil cylinder 4 is fixed on the counterweight lifting bracket 3. Rolling components 7 are installed at both the bottom and the top of the counterweight lifting bracket 3. The counterweight lifting bracket 3 is slidably installed on the rear section 101 of the turntable through the rolling components 7. Rolling components 7 are installed at both the bottom and the top of the counterweight lifting bracket 3. The counterweight lifting bracket 3 is installed on the rear section 101 of the turntable through the rolling components 7, and the rolling components 7 are used to roll on the rear section 101 of the turntable to realize the sliding of the counterweight lifting bracket 3 in the direction close to or away from the rotation center of the turntable 1. When manually pushing the counterweight lifting bracket 3, the rolling components 7 on the counterweight lifting bracket 3 roll on the rear section 101 of the turntable, so that the counterweight lifting bracket 3 slides on the rear section 101 of the turntable and drives the counterweight lifting oil cylinder 4 to move, so as to change the position of the counterweight lifting oil cylinder 4, so that the counterweight lifting oil cylinder 4 can lift the counterweight at different positions, realizing the function of lifting the counterweight at different positions. Thus, the crane can complete, through the counterweight lifting mechanism, the operation of obtaining different counterweight center-of-gravity positions by changing the counterweight position without increasing the fixed counterweight, so as to meet the requirements of different working sites and reduce the transportation cost. This counterweight lifting mechanism not only has a simple structure, but also rolling components 7 are provided at the moving contact positions between the counterweight lifting bracket 3 and the rear section 101 of the turntable, greatly reducing the frictional resistance. When it is necessary to change the position of the counterweight lifting oil cylinder 4, only need to manually push the counterweight lifting bracket 3, then the counterweight lifting bracket 3 can roll on the rear section 101 of the turntable through the rolling components 7 and drive the counterweight lifting oil cylinder 4 to move synchronously, without setting up an additional driving mechanism to push the counterweight lifting bracket 3 to move, greatly improving the working efficiency of the crane in switching different working conditions.

[0037] In this embodiment, the rolling component 7 is a roller shaft, that is, roller shafts are installed at both the bottom and the top of the counterweight lifting bracket 3, but it is not limited thereto. In other embodiments, the rolling component 7 can also be a roller, a ball, and other rolling components, as long as it can drive the counterweight lifting bracket 3 to slide on the rear section 101 of the turntable in a rolling manner.

[0038] In this embodiment, the number of the counterweight lifting brackets 3 is two, and the two counterweight lifting brackets 3 are respectively arranged on the opposite sides of the rear section 101 of the turntable. By arranging two counterweight lifting brackets 3, and the two counterweight lifting brackets 3 only need to be arranged on both sides of the rear section 101 of the turntable, without occupying the counterweight layout space below the rear section 101 of the turntable, and the two counterweight lifting brackets 3 can be used to lift the counterweight at the same time, making the force more uniform and the stability better.

[0039] To achieve the sliding guiding effect on the counterweight lifting bracket 3 and the counterweight lifting oil cylinder 4, a guiding mechanism is also provided on the rear section 101 of the turntable and the counterweight lifting bracket 3. Specifically, the guiding mechanism includes a slide rail 2 and a chute 202. The slide rail 2 can be provided on one of the rear section 101 of the turntable and the counterweight lifting bracket 3, and the chute 202 can be provided on the other of the rear section 101 of the turntable and the counterweight lifting bracket 3. In this embodiment, the slide rail 2 is provided on the rear section 101 of the turntable, and the chute 202 is provided on the counterweight lifting bracket 3. Specifically, the slide rail 2 can be provided at the bottom position of the rear section 101 of the turntable, and the chute 202 can be correspondingly provided at the bottom position of the counterweight lifting bracket 3. When manually pushing the counterweight lifting bracket 3, the rolling components 7 on the counterweight lifting bracket 3 roll on the rear section 101 of the turntable. Under the guiding action of the slide rail 2 and the chute 202, the counterweight lifting bracket 3 slides more stably on the rear section 101 of the turntable, and the counterweight lifting bracket 3 drives the counterweight lifting oil cylinder 4 to move linearly.

[0040] In this embodiment, upper extension plates 5 and lower extension plates 6 are provided at any one side position on the opposite sides of the rear section 101 of the turntable. The upper extension plate 5 extends horizontally outward from the top of the rear section 101 of the turntable, and the lower extension plate 6 extends horizontally outward from the bottom of the rear section 101 of the turntable. The counterweight lifting bracket 3 is installed between the upper extension plate 5 and the lower extension plate 6 of the rear section 101 of the turntable.

[0041] Specifically, a baffle 502 protrudes from the lower surface of the upper extension plate 5 toward the lower extension plate 6. The rolling components 7 at the top of the counterweight lifting bracket 3 are in contact with the inner surface of the baffle 502. When manually pushing the counterweight lifting bracket 3, the rolling components 7 at the top of the counterweight lifting bracket 3 roll on the inner surface of the baffle 502.

[0042] Specifically, a support plate 601 is provided on the upper surface of the lower extension plate 6. The rolling components 7 at the bottom of the counterweight lifting bracket 3 are in contact with the upper surface of the support plate 601. When manually pushing the counterweight lifting bracket 3, the rolling components 7 at the bottom of the counterweight lifting bracket 3 roll on the upper surface of the support plate 601. In this embodiment, the support plate 601 and the slide rail 2 are integrally formed into an L-shaped structure, where the support plate 601 is parallel to and stacked with the lower extension plate 6 up and down, and the slide rail 2 is perpendicular to the lower extension plate 6. The support plate 601, the slide rail 2, and the baffle 502 can be made of wear-resistant materials to increase the wear resistance and service life when the counterweight lifting bracket 3 slides on the rear section 101 of the turntable.

[0043] Please refer to Figure 4, in this embodiment, the axis of the rolling component 7 at the bottom of the counterweight lifting bracket 3 is in the horizontal direction, and the axis of the rolling component 7 at the top of the counterweight lifting bracket 3 is in the vertical direction, so that the rolling component 7 at the bottom of the counterweight lifting bracket 3 is perpendicular to the rolling component 7 at the top of the counterweight lifting bracket 3. In this way, the rolling component 7 at the bottom of the counterweight lifting bracket 3 can be in good contact with the upper surface of the support plate 601, and at the same time, the rolling component 7 at the top of the counterweight lifting bracket 3 can be in good contact with the inner surface of the baffle 502. If the rolling component 7 at the top of the counterweight lifting bracket 3 is set in the horizontal direction and rolls in contact with the lower surface of the upper extension plate 5, due to the gravitational action of the counterweight lifting bracket 3 and the counterweight lifting oil cylinder 4 and the existence of assembly errors, there will often be a gap between the rolling component 7 at the top of the counterweight lifting bracket 3 and the lower surface of the upper extension plate 5. Therefore, it cannot be ensured that the rolling component 7 at the top of the counterweight lifting bracket 3 is in good contact with the lower surface of the upper extension plate 5. By setting the axis of the rolling component 7 at the top of the counterweight lifting bracket 3 in the vertical direction and making the rolling component 7 at the top of the counterweight lifting bracket 3 contact the inner surface of the baffle 502, it can be ensured that the rolling component 7 at the top of the counterweight lifting bracket 3 is in good contact with the inner surface of the baffle 502.

[0044] Specifically, the turntable 1 is a prior art, carrying various structures and components of the upper part of the crane, and capable of rotating around the vertical axis of the crane. The rear section 101 of the turntable is the rear section part of the turntable 1.

[0045] As Figures 1 to 6 shown, the counterweight lifting mechanism further includes a first limiting mechanism 8 arranged at the bottom of the counterweight lifting bracket 3. A plurality of first limiting holes 201 are formed in the slide rail 2, and the plurality of first limiting holes 201 correspond to a plurality of preset counterweight lifting positions. A first jack 301 is formed at the bottom of the counterweight lifting bracket 3, and the first limiting mechanism 8 is installed in the first jack 301; the first limiting mechanism 8 is used for inserting into the coincident first jack 301 and first limiting hole 201 to limit and lock the counterweight lifting bracket 3 at this position when the counterweight lifting bracket 3 moves to make the first jack 301 coincide with a corresponding first limiting hole 201.

[0046] Specifically, in this embodiment, there is one first jack 301 and it is arranged at the bottom of the counterweight lifting bracket 3. The first limiting mechanism 8 is installed in the first jack 301. The first limiting holes 201 are formed in the slide rail 2 and there are no less than two of them. The position of each first limiting hole 201 corresponds to a preset counterweight lifting position. When the counterweight lifting bracket 3 moves to a corresponding counterweight lifting position and it is necessary to limit the counterweight lifting bracket 3, the first limiting mechanism 8 is inserted into the coincident first jack 301 and first limiting hole 201 to limit and lock the counterweight lifting bracket 3 at this position. The first limiting mechanism 8 can specifically be, but is not limited to, a bolt.

[0047] Specifically, a plurality of second limiting holes 501 are formed in the upper extension plate 5, and the plurality of second limiting holes 501 correspond to a plurality of preset counterweight lifting positions. A second jack 302 is formed at the top of the counterweight lifting bracket 3. The counterweight lifting mechanism further includes a second limiting mechanism 9 disposed at the top of the counterweight lifting bracket 3. The second limiting mechanism 9 is configured to insert into the coincident second limiting hole 501 and the second jack 302 to limit and lock the counterweight lifting bracket 3 at this position when the counterweight lifting bracket 3 moves to make the second jack 302 coincide with a corresponding second limiting hole 501.

[0048] Specifically, in this embodiment, there is one second jack 302 and it is disposed at the top of the counterweight lifting bracket 3. There are at least two second limiting holes 501 formed in the upper extension plate 5, and the position of each second limiting hole 501 corresponds to a preset counterweight lifting position. When the counterweight lifting bracket 3 moves to a corresponding counterweight lifting position and it is necessary to limit the counterweight lifting bracket 3, the second limiting mechanism 9 inserts into the coincident second limiting hole 501 and the second jack 302 to limit and lock the counterweight lifting bracket 3 at this position. The second limiting mechanism 9 can specifically be, but is not limited to, a bolt.

[0049] In this embodiment, each rolling component 7 located at the bottom of the counterweight lifting bracket 3 is detachably installed in a U-shaped block 701. An installation hole 703 penetrates through a side wall of one side of the U-shaped block 701. The rolling component 7 is loaded into the U-shaped block 701 from one side of the installation hole 703, and then a sealing plate 702 is used to press against the rolling component 7 from one side of the installation hole 703 to prevent the rolling component 7 from detaching from the U-shaped block 701. In addition, an installation groove 203 is provided at the bottom of the counterweight lifting bracket 3, and the installation groove 203 is adjacent to the sliding groove 202. The U-shaped block 701 is fixedly installed in the installation groove 203. The rolling component 7 is assembled into the U-shaped block 701, which is easy to install and disassemble. If the structure rusts or deforms after long-term use, resulting in unsmooth sliding, it can also be disassembled and replaced conveniently and quickly, facilitating later maintenance. Similarly, each rolling component 7 located at the top of the counterweight lifting bracket 3 is also detachably installed in a U-shaped block 701, and a sealing plate 702 is fixed on the U-shaped block 701.

[0050] In this embodiment, the counterweight lifting bracket 3 as a whole adopts a welded box structure and can be conveniently installed between the upper extension plate 5 and the lower extension plate 6 at the rear section 101 of the turntable. In addition, a weight-reducing hole 204 is provided at the position between the top and the bottom of the counterweight lifting bracket 3 to reduce the overall weight of the counterweight lifting bracket 3 and achieve the light weight of the counterweight lifting bracket 3 while ensuring the structural strength.

[0051] Such as Figure 4As shown, specifically, the counterweight lifting oil cylinder 4 includes a cylinder barrel 405, a piston rod 401 telescopically installed in the cylinder barrel 405, and a fastening plate 402 connected to one end of the piston rod 401.

[0052] In this embodiment, the piston rod 401 can perform extension and retraction movements driven by the counterweight lifting oil cylinder 4. The telescopic movement direction of the piston rod 401 is parallel to the central axis of the turntable 1. The fastening plate 402 is used for detachably connecting with the counterweight 12. The counterweight lifting oil cylinder 4 is fixedly installed on the counterweight lifting bracket 3 and is used to move along with the counterweight lifting bracket 3 on the rear section 101 of the turntable, so as to change the position of the counterweight through the counterweight lifting mechanism, thereby achieving the required counterweight performance by changing the position of the counterweight without increasing the fixed counterweight.

[0053] In this embodiment, a fastening plate 402 is provided at one end of the piston rod 401 away from the counterweight lifting oil cylinder 4. When the counterweight lifting oil cylinder 4 needs to lift the counterweight 12, the counterweight lifting oil cylinder 4 pushes the piston rod 401 to extend downward, and the fastening plate 402 follows the piston rod 401 to extend downward. The fastening plate 402 is snap-fitted with the counterweight 12, thereby connecting with the counterweight 12. Among them, the fastening plate 402 is a circular fastening plate, and the diameter of the fastening plate 402 is larger than the diameter of the piston rod 401.

[0054] In this embodiment, a fixing block 403 is provided on one side of the counterweight lifting oil cylinder 4. A through hole 404 is opened on the fixing block 403, and a fixing hole 303 corresponding to the through hole 404 is opened on the counterweight lifting bracket 3. The counterweight lifting oil cylinder 4 is fixed on the counterweight lifting bracket 3 through a pin 10 and a limiting plate 11. Specifically, the pin 10 is inserted into the fixing hole 303 and the through hole 404, and then the limiting plate 11 is fixed on the counterweight lifting bracket 3 to prevent the pin 10 from slipping out of the hole.

[0055] As Figure 7 and Figure 8As shown, another embodiment of the utility model provides a crane, including the counterweight lifting mechanism described in the above embodiment and a counterweight 12 installed on the crane, and a mounting part 13 is provided on the counterweight 12. Specifically, there can be multiple counterweights 12, and multiple counterweights 12 are stacked up and down. The mounting part 13 can be formed on the bottom counterweight 12 and pass through each counterweight 12 upward. The top of the mounting part 13 is hollow and has a snap-fitting groove 15 for snapping with the snap-fitting plate 402 to detachably connect the counterweight 12 to the piston rod 401 of the counterweight lifting cylinder 4. The top diameter of the snap-fitting groove 15 is small to form a neck portion. The diameter of the neck portion of the snap-fitting groove 15 is larger than the diameter of the piston rod 401 but smaller than the diameter of the snap-fitting plate 402, so that the snap-fitting plate 402 cannot fall out of the neck portion. An opening 14 is also provided on one side of the top of the mounting member 13 to connect the engaging groove 15 with the outside. The opening 14 is used for the piston rod 401 and the buckle plate 402 to be embedded in the engaging groove 15 and connected to the counterweight 12 .

[0056] The counterweight 12 is also provided with an avoidance hole 16 near the mounting part 13. When the counterweight lifting cylinder 4 needs to be connected with the counterweight 12, the piston rod 401 extends downward, and the buckle plate 402 extends downward along with the piston rod 401. The buckle plate 402 and the piston rod 401 extend into the avoidance hole 16 of the counterweight 12, and then the turntable 1 drives the counterweight lifting cylinder 4 to rotate slightly, so that the piston rod 401 and the buckle plate 402 enter the engaging groove 15 from the opening 14, and then The counterweight lifting cylinder 4 retracts the piston rod 401. Since the diameter of the neck portion of the snap-fit ​​groove 15 is smaller than the diameter of the snap-fit ​​plate 402, the snap-fit ​​plate 402 cannot be separated from the snap-fit ​​groove 15 at the neck portion. The snap-fit ​​plate 402 is connected to the mounting part 13, so that the counterweight lifting cylinder 4 is connected to the counterweight 12. The counterweight 12 can be lifted by the counterweight lifting cylinder 4, and then the counterweight 12 can be moved to the desired working position by rotating the turntable 1.

[0057] Specifically, the counterweight 12 is installed on the chassis of the crane. The crane can adjust the position of the counterweight 12 by moving the chassis so that the counterweight lifting cylinder 4 follows the counterweight lifting bracket 3. No matter which counterweight lifting position it moves to, the crane can make the counterweight 12 and the counterweight lifting cylinder 4 face each other by moving the chassis, thereby utilizing the counterweight lifting cylinder 4 to extend and connect with the counterweight 12.

[0058] Specifically, in this embodiment, the crane further includes a boom, and the counterweight lifting mechanism and the boom are respectively installed on opposite sides of the turntable 1 .

[0059] The specific working process of the above-mentioned counterweight lifting mechanism includes the following operations:

[0060] Step 1: Manually push the counterweight lifting bracket 3. The rolling components 7 on the counterweight lifting bracket 3 roll on the rear section 101 of the turntable. Under the guiding action of the slide rail 2 and the chute 202, the counterweight lifting bracket 3 slides on the rear section 101 of the turntable and drives the counterweight lifting oil cylinder 4 to move, moving the counterweight lifting oil cylinder 4 to the position where the counterweight needs to be lifted. Then, use the first limiting mechanism 8 and the second limiting mechanism 9 to limit and fix the counterweight lifting bracket 3.

[0061] Step 2: The counterweight 12 is installed on the chassis of the crane. The crane moves its chassis to move the position of the hanging member 13 in the counterweight 12 to the rotation path of the piston rod 401.

[0062] Step 3: The turntable 1 rotates, driving the counterweight lifting oil cylinder 4 to move above the counterweight 12.

[0063] Step 4: The piston rod 401 in the counterweight lifting oil cylinder 4 extends downward, driving the fastening plate 402 to also extend downward, so that the piston rod 401 and the fastening plate 402 extend into the avoidance hole 16 of the counterweight 12.

[0064] Step 5: The turntable 1 rotates, so that the piston rod 401 and the fastening plate 402 enter the engaging groove 15 from the opening 14.

[0065] Step 6: The counterweight lifting oil cylinder 4 drives the piston rod 401 to retract upward. The fastening plate 402 and the engaging groove 15 are engaged with each other, connecting the counterweight 12 to the piston rod 401 of the counterweight lifting oil cylinder 4. The counterweight lifting oil cylinder 4 lifts the counterweight 12.

[0066] Step 7: The counterweight 12 is fixed to the rear section 101 of the turntable through the counterweight lifting oil cylinder 4. Rotate the turntable 1 to separate the counterweight 12 from the chassis. One end of the turntable 1 away from the counterweight 12 is the boom. When the boom lifts a heavy object, lower the counterweight 12 to the working position to balance the tipping moment generated by the boom and the lifted heavy object, preventing the crane from tipping over during operation.

[0067] Step 8: After the lifting work is completed, the turntable 1 drives the counterweight 12 to move onto the crane chassis, and the counterweight lifting oil cylinder 4 disengages from the counterweight 12 and retracts.

[0068] Step 9: When it is necessary to re-change the position of the counterweight, first pull out the first limiting mechanism 8 and the second limiting mechanism 9, manually push the counterweight lifting bracket 3 to the new counterweight lifting position, then insert the first limiting mechanism 8 and the second limiting mechanism 9. Rotate the turntable 1 to drive the counterweight lifting mechanism to move, and repeat Steps 2 to 8 to complete changing the position of the counterweight without adding fixed counterweights to obtain the required counterweight performance.

[0069] The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claimed rights.

Claims

1. A counterweight lifting mechanism, mounted on the rear section (101) of a turntable of a crane and used to lift a counterweight (12), characterized in that: The counterweight lifting mechanism comprises a counterweight lifting bracket (3) and a counterweight lifting cylinder (4); the counterweight lifting cylinder (4) is fixed to the counterweight lifting bracket (3); rolling assemblies (7) are installed at the bottom and top of the counterweight lifting bracket (3); the counterweight lifting bracket (3) is installed on the rear section (101) of the turntable via the rolling assembly (7); and the rolling assembly (7) rolls on the rear section (101) of the turntable to achieve sliding of the counterweight lifting bracket (3) in a direction close to or away from the rotation center of the turntable (1).

2. The counterweight lifting mechanism according to claim 1, characterized in that: The rolling component (7) is a roller, a roller or a ball.

3. The counterweight lifting mechanism according to claim 1, characterized in that: The number of the counterweight lifting brackets (3) is two, and the two counterweight lifting brackets (3) are respectively arranged on opposite sides of the rear section (101) of the turntable.

4. The counterweight lifting mechanism according to claim 1, characterized in that: A guiding mechanism is also provided on the rear section (101) of the turntable and the counterweight lifting bracket (3), and the guiding mechanism comprises a slide rail (2) and a slide groove (202), wherein the slide rail (2) is arranged on one of the rear section (101) of the turntable and the counterweight lifting bracket (3), and the slide groove (202) is arranged on the other of the rear section (101) of the turntable and the counterweight lifting bracket (3).

5. The counterweight lifting mechanism according to claim 4, characterized in that: An upper extension plate (5) and a lower extension plate (6) are provided on either side of the opposite sides of the rear section (101) of the turntable. The upper extension plate (5) extends outward from the top of the rear section (101) of the turntable, and the lower extension plate (6) extends outward from the bottom of the rear section (101) of the turntable. The counterweight lifting bracket (3) is installed between the upper extension plate (5) and the lower extension plate (6) of the rear section (101) of the turntable.

6. The counterweight lifting mechanism according to claim 5, characterized in that: A baffle (502) is provided on the lower surface of the upper extension plate (5) protruding toward the lower extension plate (6), and a rolling assembly (7) on the top of the counterweight lifting bracket (3) contacts and rolls with the inner surface of the baffle (502); A support plate (601) is provided on the upper surface of the lower extension plate (6), and a rolling assembly (7) at the bottom of the counterweight lifting bracket (3) contacts and rolls on the upper surface of the support plate (601).

7. The counterweight lifting mechanism according to claim 6, characterized in that: The support plate (601) and the slide rail (2) are connected as a whole to form an L-shaped structure, wherein the support plate (601) and the lower extension plate (6) are parallel to each other and stacked up and down, and the slide rail (2) is arranged perpendicular to the lower extension plate (6).

8. The counterweight lifting mechanism according to claim 1, characterized in that: The axis of the rolling assembly (7) at the bottom of the counterweight lifting bracket (3) is in the horizontal direction, and the axis of the rolling assembly (7) at the top of the counterweight lifting bracket (3) is in the vertical direction, so that the rolling assembly (7) at the bottom of the counterweight lifting bracket (3) is arranged perpendicular to the rolling assembly (7) at the top of the counterweight lifting bracket (3).

9. The counterweight lifting mechanism according to claim 1, characterized in that: The counterweight lifting mechanism further comprises a first limiting mechanism (8) arranged at the bottom of the counterweight lifting bracket (3); after the counterweight lifting bracket (3) slides on the rear section (101) of the turntable to a preset position, the first limiting mechanism (8) is used to limit and lock the counterweight lifting bracket (3) at the position; The counterweight lifting mechanism also includes a second limiting mechanism (9) arranged on the top of the counterweight lifting bracket (3); after the counterweight lifting bracket (3) slides to a preset position on the rear section (101) of the turntable, the second limiting mechanism (9) is used to limit and lock the counterweight lifting bracket (3) at this position.

10. A crane, comprising a turntable rear section (101), characterized in that: The crane further comprises a counterweight lifting mechanism as claimed in any one of claims 1 to 9, wherein the counterweight lifting mechanism is mounted on the rear section (101) of the turntable.

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