WO2021259170A1

WO2021259170A1 - Counterweight displacement mechanism and crane

Info

Publication number: WO2021259170A1
Application number: PCT/CN2021/101017
Authority: WO
Inventors: 张敏; 关文文; 李博
Original assignee: 三一汽车起重机械有限公司
Priority date: 2020-06-24
Filing date: 2021-06-18
Publication date: 2021-12-30
Also published as: CN111689411A; CN111689411B

Abstract

A counterweight displacement mechanism and a crane. The counterweight displacement mechanism is used for driving a counterweight to move and comprises a main frame (2), a displacement frame (3), a retractable mechanism, a first positioning mechanism (4); the main frame (2) is used for being connected to a rotary platform (1); the displacement frame (3) is provided on the main frame (2) by means of the first positioning mechanism (4); the retractable mechanism has one end connected to the displacement frame (3), and the other end connected to the rotary platform (1); the retractable mechanism is used for driving the displacement frame (3) to perform linear movement in the direction moving close to or away from the rotary platform (1). By means of extension and retraction of the retractable mechanism, the displacement frame is driven to move on the main frame to achieve movement of the counterweight; the displacement frame is positioned and limited by means of the first positioning mechanism, thereby improving the stability of the displacement frame and ensuring the hoisting stability of the whole machine.

Description

Counterweight displacement mechanism and crane

Technical field

The invention relates to the technical field of crane accessories, and in particular to a counterweight displacement mechanism and a crane.

Background technique

As the current lightweight development is relatively rapid, the layout of the vehicle is becoming more and more compact, and customers are paying more and more attention to the performance and stability of the vehicle, and the small and medium tonnage products are limited by the weight of the vehicle and the bridge load, and the fixed counterweight The design of the counterweight is subject to certain restrictions, and the quality of the on-board counterweight severely restricts the stability of the whole machine, and the cost of using the combined counterweight for additional vehicle transportation is too high, so increasing the distance between the center of gravity of the counterweight and the center of rotation is to ensure The stable performance of the whole machine is very important.

There are two existing methods for improving the stability of the whole machine through counterweight action, which are combined counterweight and mobile counterweight.

Without the external counterweight, the combined counterweight cannot increase the weight of the counterweight, and thus the hoisting stability of the whole machine cannot be guaranteed.

There are two ways to realize the mobile counterweight, which are the guide rail type and the connecting rod type.

However, the guide rail type has a relatively large sliding friction force during the counterweight process, so the external force required is relatively large, and the guide rail needs to be greased regularly for maintenance; while the working principle of the linkage type counterweight is four-bar linkage The structure, the relative stability of its supporting force is insufficient, and the hoisting stability of the whole machine cannot be guaranteed.

Summary of the invention

The purpose of the present invention is to provide a counterweight displacement mechanism and a crane, which can drive the displacement frame to move on the main frame through the expansion and contraction of the telescopic mechanism to realize the movement of the counterweight, and perform the displacement frame by the first positioning mechanism. Positioning improves the stability of the displacement frame and ensures the hoisting stability of the whole machine.

The embodiment of the present invention is implemented as follows:

In the first aspect, embodiments of the present invention provide a counterweight displacement mechanism for driving the counterweight to move, including a main frame, a displacement frame, a telescopic mechanism, and a first positioning mechanism;

The main frame is used to connect with the turntable, and the displacement frame is set on the main frame through the first positioning mechanism;

One end of the telescopic mechanism is connected with the displacement frame, and the other end is connected with the turntable;

The telescopic mechanism is used to drive the displacement frame to move closer to or away from the turntable.

In an alternative embodiment, the first positioning mechanism includes a first shaft body, the first shaft body is rotatably arranged on the main frame, the displacement frame is placed on the first shaft body, and when the displacement frame moves The first shafts are connected by rolling friction.

In an alternative embodiment, the first positioning mechanism further includes a positioning frame, a bearing is arranged on the positioning frame, and the first shaft body is connected to the positioning frame through the bearing.

In an alternative embodiment, the number of positioning frames is at least two, and the number of first shaft bodies is at least one;

The first shaft body is set through all positioning frames;

When there are multiple first shafts, the multiple first shafts are arranged in parallel.

In an alternative embodiment, the counterweight displacement mechanism further includes a second positioning mechanism, and the second positioning mechanism is arranged above the displacement frame.

In an alternative embodiment, the second positioning mechanism includes a runner and a second shaft body;

The second shaft body is arranged on the main frame, the runner is rotatably arranged on the second shaft body, and the displacement frame abuts against the circumferential side wall of the runner.

In an alternative embodiment, the second positioning machine pair is arranged on opposite sides of the main frame.

In an optional embodiment, the counterweight displacement mechanism further includes a third positioning mechanism arranged on the turntable or on the main frame;

The third positioning mechanism cooperates with the first positioning mechanism, the second positioning mechanism and the main frame, and is used for positioning the radial direction of the displacement frame.

In an alternative embodiment, the telescopic mechanism is an oil cylinder or an air cylinder.

In a second aspect, an embodiment of the present invention provides a crane including a turntable, a counterweight, and the counterweight displacement mechanism of any one of the foregoing embodiments, and the counterweight is connected to the turntable through the counterweight displacement mechanism.

The beneficial effects of the embodiments of the present invention are:

Through the expansion and contraction of the telescopic mechanism, the displacement frame is driven to move on the main frame to realize the movement of the counterweight. The positioning and limitation of the displacement frame are carried out by the first positioning mechanism, which improves the stability of the displacement frame and ensures the hoisting stability of the whole machine. sex.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative work.

Figure 1 is a schematic structural diagram of a counterweight displacement mechanism provided by an embodiment of the present invention;

2 is a schematic diagram of the three-dimensional structure of the counterweight displacement mechanism provided by the embodiment of the present invention after being extended;

3 is a schematic diagram of the three-dimensional structure of the counterweight displacement mechanism provided by the embodiment of the present invention after being retracted;

4 is another perspective view of the three-dimensional structure diagram of the counterweight displacement mechanism provided by the embodiment of the present invention after being retracted (with the counterweight removed);

Fig. 5 is a schematic structural diagram of a displacement frame of a counterweight displacement mechanism provided by an embodiment of the present invention;

6 is a schematic structural diagram of a connecting plate of a counterweight displacement mechanism provided by an embodiment of the present invention;

7 is a schematic structural diagram of a second positioning mechanism of a counterweight displacement mechanism provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a third positioning mechanism of a counterweight displacement mechanism provided by an embodiment of the present invention.

Icon: 1-Turntable; 2-Main frame; 3-Displacement frame; 4-First positioning mechanism; 5-Second positioning mechanism; 6-third positioning mechanism; 7-connecting plate; 8-counterweight; 9 -Oil cylinder; 10-positioning frame; 11-first shaft body; 12-longitudinal frame; 13-transverse frame; 14-connecting lug; 15-welding hole; 16-first fixing hole; 17-second shaft body; 18 -Runner; 19- fixed plate; 20- support plate; 21- limit plate; 22- second fixing hole; 23- reinforcement plate.

detailed description

In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the present invention generally described and illustrated in the drawings herein may be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated position or position relationship is based on the position or position relationship shown in the drawings, or the position or position relationship usually placed when the product of the invention is used. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying. The referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical", "overhanging" and other terms do not mean that the component is required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, “horizontal” only means that its direction is more horizontal than “vertical”, and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that the terms "set", "installation", "connected", and "connected" should be understood in a broad sense unless otherwise clearly specified and limited. For example, they may be fixed connections. It can also be detachably connected or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present invention can be understood in specific situations.

Hereinafter, some embodiments of the present invention will be described in detail with reference to FIGS. 1 to 8. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

In the first aspect, as shown in Fig. 1, an embodiment of the present invention provides a counterweight displacement mechanism installed on the turntable 1 for driving the counterweight to move on the turntable 1, including a main frame 2, a displacement frame 3, The telescopic mechanism and the first positioning mechanism 4; the main frame 2 is used to connect with the turntable 1, and the displacement frame 3 is set on the main frame 2 through the first positioning mechanism 4; one end of the telescopic mechanism is connected with the displacement frame 3, and the other end is connected with the displacement frame 3 The turntable 1 is connected; the telescopic mechanism is used to drive the displacement frame 3 to move in a linear direction toward or away from the turntable 1.

In the present invention, the counterweight displacement mechanism is installed on the turntable 1, and when the operator performs operations, it faces away from the counterweight displacement mechanism. Therefore, in the present invention, the front of the worker is defined as the front, and the back direction of the worker is defined as the rear.

In this embodiment, one end of the main frame 2 is fixedly connected to the turntable 1, the first positioning mechanism 4 and the telescopic mechanism are arranged under the main frame 2, and at the same time, the displacement frame 3 is also arranged under the main frame 2. The counterweight 8 is fixedly connected to the rear section below the displacement frame 3 through the connecting plate 7.

The lower side of the displacement frame 3 is connected with the first positioning mechanism 4 and can slide on the first positioning mechanism 4. The first positioning mechanism 4 is fixedly connected with the main frame 2 to ensure the stability of the displacement frame 3 when it moves on the first positioning mechanism 4.

Specifically, as shown in Figures 1 and 2, when operations are required, the extension of the telescopic mechanism drives the displacement frame 3 to move backwards on the first positioning mechanism 4, and further drives the counterweight 8 to move backwards. In turn, the center of gravity of the whole machine is moved back, which improves the stability of the whole vehicle during operation; as shown in Figure 3 and Figure 4, when no work is required, such as when driving, the displacement frame 3 is driven by the contraction of the telescopic mechanism. The first positioning mechanism 4 moves forward to further drive the counterweight 8 to move forward, thereby realizing the forward movement of the center of gravity of the whole machine, reducing the overall volume and improving the passability of the whole machine.

In this embodiment, under the drive of the telescopic mechanism, the counterweight 8 follows the displacement frame 3 to move only in the forward and backward direction, so that the telescopic mechanism does not need to be supported in the vertical direction, which ensures the stability of the telescopic mechanism. , To ensure the reliability of the counterweight 8 when it moves.

Specifically, as shown in FIG. 5, in this embodiment, the displacement frame 3 includes a vertical frame 12 and a horizontal frame 13, wherein there are two vertical frames 12, two vertical frames 12 are arranged in parallel, and the horizontal frame 13 is also A plurality of horizontal frames 13 are arranged in parallel between the two vertical frames 12, and both ends of the horizontal frame 13 are fixedly connected with the vertical frames 12, respectively. Among them, the vertical frame 12 and the horizontal frame 13 are arranged perpendicular to each other.

More specifically, in this embodiment, the length of the horizontal frame 13 is greater than or equal to the width of the main frame 2, so that the vertical frame 12 is arranged below the left and right sides of the main frame 2.

Specifically, in this embodiment, as shown in FIG. 6, the connecting plate 7 has an L-shaped plate structure, and its vertical plate surface is provided with welding holes 15 through which the connecting plate 7 and the vertical frame 12 are connected. Welding, and the positions on the connecting plate 7 that are convenient for welding with the vertical frame 12 are all welded to increase the strength of the connection between the connecting plate 7 and the vertical frame 12; A fixing hole 16 through which the fixing bolt passes through the first fixing hole 16 and then connected to the counterweight 8 to realize the fixed connection between the connecting plate 7 and the counterweight 8, and finally realize the fixed connection of the counterweight 8 to the displacement frame 3 .

More specifically, in this embodiment, the vertical board surface is connected to the outer side surface of the vertical frame 12, that is, connected to the side surface of the vertical frame 12 away from the other vertical frame 12; the other board surface is set on the vertical board surface. The outer side of the vertical plate, that is, the side of the vertical plate away from the vertical frame 12, can facilitate the connection of the connecting plate 7 with the counterweight 8.

In this embodiment, the welding holes 15 provided on the connecting plate 7 are strip-shaped holes, which can increase the welding length, thereby increasing the connection strength between the connecting plate 7 and the vertical frame 12.

In this embodiment, the first fixing hole 16 is a waist hole, and the waist hole is provided so that the connecting plate 7 can be matched with different weights 8 and the adaptability of the connecting plate 7 is improved.

In this embodiment, the numbers of the welding holes 15 and the first fixing holes 16 are both multiple to ensure the connection stability and connection strength between the connecting plate 7 and the counterweight 8 and the connecting plate 7 and the vertical frame 12.

More specifically, in this embodiment, there are two connecting plates 7, which are respectively arranged on the outer sides of the two vertical frames 12, so that the arrangement of the counterweight 8 on the displacement frame 3 is more balanced.

It should be pointed out that in this embodiment, the connection plate 7 and the vertical frame 12 are welded, but it is not limited to welding, it can also be other fixed connection methods, such as bolt connection, or It may be a pin connection or the like, as long as it can achieve a fixed connection between the connecting plate 7 and the vertical frame 12.

In an alternative embodiment, the first positioning mechanism 4 includes a first shaft body 11, the first shaft body 11 is rotatably arranged on the main frame 2, and the displacement frame 3 is placed on the first shaft body 11. When the displacement frame 3 moves, it is connected with the first shaft body 11 in a rolling friction manner.

The displacement frame 3 and the first shaft body 11 are connected by rolling friction. When the displacement frame 3 moves on the first shaft body 11, the friction between the displacement frame 3 and the first shaft body 11 The force drives the first shaft 11 to rotate, so that the first shaft 11 does not generate resistance to the displacement frame 3.

Specifically, in this embodiment, the first positioning mechanism 4 further includes a positioning frame 10.

Specifically, in this embodiment, the upper end of the positioning frame 10 is fixedly connected to the lower side of the main frame 2, a rotation hole is provided on the positioning frame 10, and the first shaft body 11 is rotatably connected to the positioning frame 10 through the rotation hole.

More specifically, in this embodiment, the positioning frame 10 is plate-shaped, and the first shaft 11 is perpendicular to the plate surface of the positioning frame 10 to ensure that the first shaft 11 will not move from the rotation hole under the action of gravity. Break away.

When in use, the vertical frame 12 of the displacement frame 3 is arranged on the first shaft body 11, and the displacement frame 3 is moved forward and backward in a straight line under the action of the telescopic mechanism, under the action of friction, it will drive The first shaft body 11 rotates. In other words, the first shaft 11 can support the displacement frame 3 and at the same time can ensure the normal front and rear movement of the displacement frame 3.

More specifically, in this embodiment, the axial direction of the first shaft 11 is the left and right direction, and the smooth rotation of the first shaft 11 can be ensured when the displacement frame 3 moves back and forth.

Specifically, in this embodiment, the fixed connection between the positioning frame 10 and the main frame 2 is welding.

It should be pointed out that the fixed connection between the positioning frame 10 and the main frame 2 can be welding, but it is not limited to the welding connection, it can also be other connection methods, such as bolt connection or riveting. As long as it can realize the fixed connection between the positioning frame 10 and the main frame 2 and ensure the stability of the positioning frame 10 on the main frame 2.

In an alternative embodiment, the positioning frame 10 is provided with a bearing, and the first shaft body 11 is connected to the positioning frame 10 through the bearing.

After the bearing is installed in the rotating hole, the outer ring of the bearing and the inner wall of the rotating hole can be interference fit, which can ensure that the bearing will not be separated from the rotating hole, and then the first shaft body 11 and the inner ring of the bearing are interference fit or transitioned Matching, so that the first shaft body 11 will not be separated from the inner ring of the bearing. After this arrangement, the rotation resistance between the first shaft body 11 and the positioning frame 10 is reduced, so that the displacement frame 3 moves forward and backward more smoothly.

In an alternative embodiment of the present invention, the number of positioning frames 10 is at least two, and the number of first shaft bodies 11 is at least two; the first shaft body 11 is disposed through all positioning frames 10, and multiple first shafts The bodies 11 are arranged in parallel.

Specifically, the plate surfaces of the two positioning frames 10 are arranged in parallel, the axial directions of the rotating holes on the positioning frame 10 are parallel, and the rotating holes on the two positioning frames 10 are arranged coaxially one by one, so that the first shaft body 11 can Pass through the rotation holes on the two positioning frames 10 respectively.

The first shaft body 11 is supported and positioned by the two positioning frames 10, which can ensure the balance and stability of the first shaft body 11, thereby ensuring the balance and stability of the displacement frame 3 when moving forward and backward; The arrangement of the two first shaft bodies 11 can make the displacement frame 3 move more smoothly on the first shaft body 11.

Since the counterweight 8 is arranged at the rear section below the displacement frame 3, and the first shaft body 11 is also arranged under the displacement frame 3, when the counterweight 8 moves to the rear of the first shaft body 11, according to According to the principle of leverage, the first shaft body 11 is equivalent to the fulcrum in the lever at this time, and the displacement frame 3 is equivalent to the lever, and the counterweight 8 is equivalent to the rotating power of the lever, so that the displacement frame 3 is affected by the lever action, and The front end of the displacement frame 3 is lifted up, thereby affecting the stability of the displacement frame 3.

In order to solve the above problem, in an alternative embodiment of the present invention, a second positioning mechanism 5 is provided above the displacement frame 3, and the second positioning mechanism 5 abuts against the upper side of the vertical frame 12 of the displacement frame 3.

Specifically, the second positioning mechanism 5 is arranged in front of the first shaft 11 and above the displacement frame 3. When the counterweight 8 moves to the rear of the first shaft 11, at this time, the first shaft The body 11 is equivalent to the fulcrum of the lever, the displacement frame 3 is equivalent to the lever, the counterweight 8 is equivalent to the power of the lever, and the second positioning mechanism 5 is equivalent to the resistance of the lever.

At this time, the front of the displacement frame 3 is lifted up under the action of the lever to abut against the second positioning mechanism 5, and the second positioning mechanism 5 is fixedly arranged on the main frame 2 to generate resistance to the displacement frame 3, making the displacement The front end of the position frame 3 cannot be upward, thereby ensuring the balance and stability of the position frame 3.

Specifically, in this embodiment, the second positioning mechanism 5 abuts on the upper side surface of the vertical frame 12 of the displacement frame 3, so that when the displacement frame 3 moves forward and backward, it can ensure that the second positioning mechanism 5 is always in contact with the displacement. The frame 3 abuts against each other.

Since the displacement frame 3 will move back and forth, and the second positioning mechanism 5 abuts the upper side of the vertical frame 12, friction will be generated between the second positioning mechanism 5 and the displacement frame 3, which will increase the displacement frame. 3 The resistance when moving forward and backward will further increase the power required for the telescopic mechanism to perform telescopic actions and increase the consumption of resources.

In order to solve the above problems, in an alternative embodiment of the present invention, the second positioning mechanism 5 is configured as a rotating structure to reduce the friction between the second positioning mechanism 5 and the displacement frame 3.

Specifically, in this embodiment, as shown in FIG. 7, the second positioning mechanism 5 includes a runner 18 and a second shaft body 17; the second shaft body 17 is arranged on the main frame 2, and the runner 18 is rotatably arranged on the On the biaxial body 17, the displacement frame 3 abuts against the circumferential side wall of the runner 18.

More specifically, in this embodiment, the circumferential side wall of the runner 18 abuts against the vertical frame 12. When the displacement frame 3 moves back and forth, the runner 18 moves around the second shaft under the action of friction. 17 is rotated to eliminate the friction between the vertical frame 12 and the runner 18, and at the same time, it can ensure that the runner 18 produces vertical resistance to the vertical frame 12, so as to ensure that the front section of the displacement frame 3 will not lift up. .

More specifically, in this embodiment, a bearing is also provided on the runner 18, and the outer ring of the bearing is connected to the runner 18, and the inner ring of the bearing is connected to the second shaft body 17, further reducing the change of the runner 18 The effect when the bit frame 3 moves back and forth.

In order to ensure the balance and stability of the displacement frame 3 when moving forward and backward, in an alternative embodiment of the present invention, the second positioning mechanism 5 is provided in pairs on opposite sides of the main frame 2.

Specifically, in this embodiment, there are two second positioning mechanisms 5 for each pair, and the two second positioning mechanisms 5 are respectively arranged on the left and right sides of the main frame 2 and respectively abut the upper sides of the two vertical frames 12 catch.

More specifically, in this embodiment, the second positioning mechanism 5 is in two pairs, of which one pair is arranged at the front section of the main frame 2, and the other pair is arranged at the rear section of the main frame 2, and both are arranged on the first shaft. The front of the body 11 or the front and rear of the first shaft body 11 are respectively arranged to ensure the stability of the displacement frame 3.

In an alternative embodiment, the counterweight displacement mechanism further includes a third positioning mechanism 6 arranged on the turntable 1 or on the main frame 2; the third positioning mechanism 6 and the first positioning mechanism 4 and the second positioning mechanism 6 The second positioning mechanism 5 cooperates with the main frame 2 for positioning the displacement frame 3 in the radial direction.

Specifically, in this embodiment, the third positioning mechanism 6 is arranged on the left and right sides of the front section of the main frame 2, and is respectively arranged on the outside of the vertical frame 12 to prevent the vertical frame 12 from going outward, that is, away from the main frame 2. Move in the direction of, thereby ensuring the stability of the displacement frame 3 on the main frame 2.

Specifically, in this embodiment, as shown in FIG. 8, the third positioning mechanism 6 includes a fixing plate 19, a supporting plate 20, and a limiting plate 21. The upper end of the fixing plate 19 is connected to one end of the supporting plate 20, and the limiting plate 21 The lower end is connected to the other end of the support plate 20, the fixing plate 19 is parallel to the limiting plate 21, and both the fixing plate 19 and the limiting plate 21 are perpendicular to the supporting plate 20.

More specifically, a second fixing hole 22 is provided on the fixing plate 19, and the fixing plate 19 is fixed to one side of the turntable 1 by arranging bolts in the second fixing hole 22, or the fixing plate 19 is fixed to the main frame. On the side of 2, the vertical frame 12 is arranged on the upper side of the supporting plate 20, and the limiting plate 21 is arranged on the outer side of the vertical frame 12.

At this time, the inner side of the vertical frame 12 is the turntable 1 or the main frame 2, the outer side is the limit plate 21, the lower side is the support plate 20, and the upper side is the runner 18, thereby realizing the complete positioning of the vertical frame 12, so that the vertical frame 12 is completely positioned. The frame 12 can only move back and forth.

In this embodiment, the third positioning mechanism 6 is an open-top assembly structure, which can facilitate the installation of the displacement frame 3.

In this embodiment, in order to further ensure the supporting strength of the supporting plate 20, a reinforcing plate 23 is provided between the fixing plate 19 and the supporting plate 20, and the reinforcing plate 23 is connected to the lower side of the supporting plate 20 and the outer side of the fixing plate 19 Fixed connection. Among them, the fixed connection method can be welding, riveting, bolting, and so on.

In this embodiment, there are two third positioning mechanisms 6, which are respectively arranged symmetrically on the left and right sides of the main frame 2.

In an alternative embodiment, the telescopic mechanism is an oil cylinder 9 or an air cylinder.

A connecting lug 14 is provided on one of the horizontal frames 13 of the displacement frame 3, and a connecting lug 14 is also provided on the turntable 1. The two ends of the oil cylinder 9 are respectively connected with the two connecting lugs 14 to drive the displacement frame 3 Move forward and backward.

It should be pointed out that in this embodiment, the telescopic mechanism can use the cylinder 9 or the cylinder, but it is not limited to the cylinder 9 or the cylinder, it can also be other telescopic mechanisms, such as The scissor type telescopic mechanism only needs to be able to realize the linear movement of the displacement frame 3 through telescoping.

It should also be pointed out that the mechanism that drives the displacement frame 3 to move linearly can be a telescopic mechanism, but it is not limited to a telescopic mechanism, it can also be other linear displacement mechanisms, such as a threaded screw structure or a gear. The rack structure and the like, as long as the structure can drive the displacement frame 3 to move linearly in the front and rear directions.

In the second aspect, an embodiment of the present invention provides a crane including a turntable 1, a counterweight 8 and the counterweight displacement mechanism according to any one of the foregoing embodiments, and the counterweight 8 is displaced by the counterweight The mechanism is connected to the turntable 1.

When in use, the cab is on the turntable 1, and the boom and the counterweight displacement mechanism are respectively arranged at the front and rear of the turntable 1. The position of the counterweight 8 in the counterweight displacement mechanism is changed to achieve hoisting. The stability.

The beneficial effects of the embodiments of the present invention are:

Through the expansion and contraction of the telescopic mechanism, the displacement frame 3 is driven to move on the main frame 2 to realize the movement of the counterweight. The positioning and limitation of the displacement frame 3 by the first positioning mechanism 4 improve the stability of the displacement frame 3 and ensure The hoisting stability of the whole machine.

The above descriptions are only preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

A counterweight displacement mechanism for driving the counterweight to move, characterized in that it comprises a main frame, a displacement frame, a telescopic mechanism and a first positioning mechanism;

The main frame is used for connecting with a turntable, and the displacement frame is arranged on the main frame through the first positioning mechanism;

One end of the telescopic mechanism is connected with the displacement frame, and the other end is connected with the turntable;

The telescopic mechanism is used to drive the displacement frame to move closer to or away from the turntable.
The counterweight displacement mechanism according to claim 1, wherein the first positioning mechanism comprises a first shaft body;

The first shaft body is rotatably arranged on the main frame, the displacement frame is placed on the first shaft body, and the displacement frame is moved between the displacement frame and the first shaft body. Connected by rolling friction.
The counterweight displacement mechanism according to claim 2, wherein the first positioning mechanism further comprises a positioning frame, the positioning frame is provided with a bearing, and the first shaft body passes through the bearing and the Positioning frame connection.
The counterweight displacement mechanism according to claim 3, wherein the number of the positioning frame is at least two, and the number of the first shaft body is at least one;

The first shaft body is set through all the positioning frames;

When there are multiple first shafts, the multiple first shafts are arranged in parallel.
The counterweight displacement mechanism according to claim 1, further comprising a second positioning mechanism, and the second positioning mechanism is arranged above the displacement frame.
The counterweight displacement mechanism according to claim 5, wherein the second positioning mechanism comprises a runner and a second shaft body;

The second shaft body is arranged on the main frame, the runner is rotatably arranged on the second shaft body, and the displacement frame abuts against the circumferential side wall of the runner.
The counterweight displacement mechanism according to claim 5, wherein the second positioning machine is formed in pairs on opposite sides of the main frame.
The counterweight displacement mechanism according to claim 5, further comprising a third positioning mechanism arranged on the turntable or on the main frame;

The third positioning mechanism cooperates with the first positioning mechanism, the second positioning mechanism and the main frame for positioning the displacement frame in the radial direction.
The counterweight displacement mechanism according to claim 1, wherein the telescopic mechanism is an oil cylinder or an air cylinder.
A crane, characterized by comprising a turntable, a counterweight and the counterweight displacement mechanism according to any one of claims 1-9, and the counterweight is connected to the turntable through the counterweight displacement mechanism .