CN220811676U - Counterweight telescopic boom and crane - Google Patents

Abstract

The application relates to the technical field of engineering machinery and discloses a counterweight telescopic boom and a crane. Therefore, the counterweight telescopic boom provided by the application has the advantages that the secondary telescopic boom is provided, the primary telescopic bracket and the secondary telescopic bracket can extend under the cooperation of the first telescopic driving module and the second telescopic driving module, so that a larger extending range can be obtained, and the counterweight can be provided with a larger adjusting range in the first horizontal direction when being applied to a crane, so that the crane has a larger hoisting capacity.

Description

Counterweight telescopic boom and crane

Technical Field

The application relates to the technical field of cranes, in particular to a counterweight telescopic boom and a crane.

Background

With the development of large-tonnage automobile cranes, the weight requirements of the automobile cranes are also higher and higher. The greater the tonnage of the truck crane, the higher the weight requirement of the counterweight. Meanwhile, along with different working conditions, the balance weight needs to be driven to extend out of a certain distance through the telescopic boom so as to balance the crane.

The existing telescopic boom is generally only provided with one-stage telescopic boom, and the maximum extension distance is limited, so that the lifting capacity of the crane is limited.

Disclosure of utility model

The application aims to provide a counterweight telescopic boom and a crane, which are used for solving the problems that the telescopic boom in the prior art is limited in maximum extension distance and the lifting capacity of the crane is limited.

In order to achieve the above object, in a first aspect, the present application provides a counterweight telescopic boom, applied to a crane, the counterweight telescopic boom includes:

One end of the fixed bracket is used for being installed on a rotary table of the crane, and the other end of the fixed bracket extends along a first horizontal direction towards a direction away from the rotary table;

The first-stage telescopic bracket is movably arranged on the fixed bracket;

The first telescopic driving module is connected with the fixed support and the primary telescopic support and used for driving the primary telescopic support to extend or retract along the first horizontal direction relative to the fixed support;

The second-stage telescopic bracket is movably arranged on the first-stage telescopic bracket;

The second telescopic driving module is connected with the primary telescopic bracket and the secondary telescopic bracket and used for driving the secondary telescopic bracket to extend or retract along the first horizontal direction relative to the primary telescopic bracket; and

The counterweight lifting module is arranged at one end of the secondary telescopic bracket far away from the primary telescopic bracket.

As a further improvement of the above technical scheme:

in one possible embodiment, the fixing bracket includes:

An upper cover plate and a lower cover plate which are arranged in a vertically spaced and aligned manner;

two outer side sealing plates arranged at intervals along the second horizontal direction, wherein the two outer side sealing plates are arranged between the upper cover plate and the lower cover plate and are connected with the upper cover plate and the lower cover plate;

The two inner side sealing plates are arranged at intervals along the second horizontal direction, the two inner side sealing plates are arranged between the two outer side sealing plates, the inner side sealing plates are connected with the upper cover plate and the lower cover plate, and a sliding cavity for the first-stage telescopic bracket to move is formed among the adjacent outer side sealing plates, inner side sealing plates, the upper cover plate and the lower cover plate; and

The backboard is arranged at one end of the sliding cavity, which is far away from the primary telescopic bracket, and is connected with the upper cover plate and the lower cover plate.

In one possible embodiment, at least two sliding blocks are arranged between each side wall of the sliding cavity and the primary telescopic bracket.

In one possible implementation manner, the first telescopic driving module and the second telescopic driving module are uniformly distributed on a central line of the fixed support along the first horizontal direction, and the first telescopic driving module and the second telescopic driving module are vertically arranged.

In one possible implementation manner, the first telescopic driving module is a first oil cylinder, and the second telescopic driving module is a second oil cylinder;

The first piston rod of the first oil cylinder is connected with the fixed support, the first cylinder body of the first oil cylinder is arranged on the primary telescopic support, and the first piston rod is provided with a first oil port and a second oil port which are connected with a first oil inlet pipe and a first oil return pipe;

a second piston rod of the second oil cylinder is connected with the second-stage telescopic bracket, and a second cylinder body of the second oil cylinder is arranged on the first-stage telescopic bracket;

The rod cavity of the first cylinder body is communicated with the rod cavity of the second cylinder body through a first bypass oil pipe, and the rod-free cavity of the first cylinder body is communicated with the rod-free cavity of the second cylinder body through a second bypass oil pipe.

In one possible implementation manner, an assembly hole is formed in one end, far away from the primary telescopic support, of the secondary telescopic support in the vertical direction, and the counterweight lifting module is inserted into the assembly hole and is connected with the flange of the secondary telescopic support.

In a possible implementation manner, the counterweight lifting module is a third oil cylinder, and the third oil cylinder is connected with a second oil inlet pipe and a second oil return pipe;

the counterweight telescopic boom further comprises a drag chain mechanism, wherein the drag chain mechanism is arranged on the fixed support, and the second oil inlet pipe and the second oil return pipe are both arranged on the drag chain mechanism.

In one possible embodiment, the fixed support, the primary telescoping support and the secondary telescoping support are all frame structures.

In one possible implementation manner, the middle part of the fixing support is provided with a hollowed-out opening penetrating in the vertical direction, and the first telescopic driving module is arranged in the hollowed-out opening.

In one possible implementation manner, the two sides of the fixing support are provided with reinforcing rib structures, and the reinforcing rib structures extend from the back plate of the fixing support to the direction of the primary telescopic support.

In order to achieve the above object, in a second aspect, the present application further provides a crane, including the counterweight telescopic boom according to the first aspect.

Compared with the prior art, the application has the beneficial effects that:

The application provides a counterweight telescopic boom and a crane, wherein the counterweight telescopic boom is provided with a primary telescopic bracket on a fixed bracket, a secondary telescopic bracket is arranged on the primary telescopic bracket, the primary telescopic bracket is driven to extend or retract along a first horizontal direction relative to the fixed bracket by a first telescopic driving module, and the secondary telescopic bracket is driven to extend or retract along the first horizontal direction relative to the primary telescopic bracket by a second telescopic driving module. Therefore, the counterweight telescopic boom provided by the application has the advantages that the secondary telescopic boom is provided, the primary telescopic bracket and the secondary telescopic bracket can extend under the cooperation of the first telescopic driving module and the second telescopic driving module, so that a larger extending range can be obtained, and the counterweight can be provided with a larger adjusting range in the first horizontal direction when being applied to a crane, so that the crane has a larger hoisting capacity.

Additional features and advantages of the application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate only certain embodiments of the application and, therefore, should not be considered as limiting the scope, since it is possible to obtain other related drawings from the drawings without inventive step by those of ordinary skill in the art. In the drawings:

Fig. 1 shows a schematic perspective view of a counterweight telescopic boom according to an embodiment of the application;

FIG. 2 illustrates a top view of the counterweight telescoping boom shown in FIG. 1;

FIG. 3 is a schematic perspective view showing a fixing bracket in the counterweight telescopic boom shown in FIG. 1;

FIG. 4 is a schematic view showing the structure of the upper cover plate in the fixing bracket shown in FIG. 3;

FIG. 5 shows a cross-sectional view in the direction B-B in FIG. 2;

Fig. 6 shows a partially enlarged schematic view at a in fig. 1.

Reference numerals illustrate:

100. A fixed bracket; 101. a hollowed-out opening; 102. a reinforcing rib structure; 110. an upper cover plate; 111. a through port; 120. a lower cover plate; 130. an outer sealing plate; 140. an inner sealing plate; 150. a back plate; 160. a sliding chamber; 170. a first mount; 171. ear plates; 172. a pin shaft; 180. a slide block; 181. a bolt; 182. a threaded fixing plate;

200. a first-stage telescopic bracket;

300. A first telescopic driving module; 300a, a first oil cylinder; 310. a first piston rod; 320. a first cylinder; 330. a second mounting base; 340. a third mount;

400. A second-stage telescopic bracket;

500. The second telescopic driving module; 500a, a second oil cylinder; 510. a second piston rod; 520. a second cylinder; 530. a fourth mount; 540. a fifth mount; 550. a first bypass oil pipe; 560. a second bypass oil line;

600. a counterweight lifting module; 600a, a third oil cylinder; 610. a flange portion;

700. A drag chain mechanism; 710. a flexible tow chain;

X, a first horizontal direction; y, the second horizontal direction; z, vertical direction; m, center line.

Detailed Description

The following describes the detailed implementation of the embodiments of the present application with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.

It should be noted that, unless otherwise indicated, terms of orientation such as "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer", "circumferential", and the like are used in the embodiments of the present application to indicate orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The application will be described in detail below with reference to the drawings in connection with exemplary embodiments.

Examples

Referring to fig. 1 and 2, the present embodiment provides a counterweight telescopic boom, which can be applied to a crane for adjusting a counterweight extension distance.

In this embodiment, the counterweight telescopic boom includes a fixed bracket 100, a primary telescopic bracket 200, a first telescopic driving module 300, a secondary telescopic bracket 400, a second telescopic driving module 500, and a counterweight lifting module 600.

Wherein, fixed bolster 100 one end is used for installing on the revolving platform of hoist, and the other end extends along first horizontal direction X in the direction of keeping away from the revolving platform. Thus, the fixed bracket 100 can be rotated with the turntable of the crane.

The primary telescopic bracket 200 is movably disposed on the fixed bracket 100. In this embodiment, the primary telescopic bracket 200 is slidable along the first horizontal direction X relative to the fixed bracket 100.

The first telescopic driving module 300 connects the fixed bracket 100 and the first stage telescopic bracket 200. The first telescopic driving module 300 is used for driving the first-stage telescopic bracket 200 to extend or retract along the first horizontal direction X relative to the fixed bracket 100.

The secondary telescopic bracket 400 is movably arranged on the primary telescopic bracket 200; in this embodiment, the secondary telescopic bracket 400 is slidable along the first horizontal direction X relative to the fixed bracket 100.

The second telescopic driving module 500 is connected to the first telescopic bracket 200 and the second telescopic bracket 400, and the second telescopic driving module 500 is used for driving the second telescopic bracket 400 to extend or retract along the first horizontal direction X relative to the first telescopic bracket 200.

The counterweight lifting module 600 is disposed at one end of the secondary telescopic bracket 400 away from the primary telescopic bracket 200, and the counterweight lifting module 600 is used for connecting and lifting the counterweight. The weight lifting module 600 lifts the weight by lifting the weight so as to facilitate the installation and removal of the weight.

In this embodiment, the fixing bracket 100, the primary telescopic bracket 200 and the secondary telescopic bracket 400 all adopt a frame structure, so as to realize a lightweight design, and simultaneously, the whole structural strength and rigidity are enhanced.

The middle part of the fixed support 100 is provided with a hollow opening 101 penetrating along the vertical direction Z, and the first telescopic driving module 300 is arranged in the hollow opening 101. The hollow opening 101 reduces the weight of the fixing bracket 100 on one hand, and facilitates the installation of the first telescopic driving module 300 on the other hand.

Referring to fig. 3 and 4, specifically, the fixing bracket 100 includes an upper cover plate 110 and a lower cover plate 120 that are aligned at intervals along a vertical direction Z, two outer sealing plates 130 that are spaced along a second horizontal direction Y, two inner sealing plates 140 that are spaced along the second horizontal direction Y, and a back plate 150. Wherein, two outside seal plates 130 are interposed between the upper cover plate 110 and the lower cover plate 120, and the outside seal plates 130 connect the upper cover plate 110 and the lower cover plate 120, thereby sealing openings at both sides between the upper cover plate 110 and the lower cover plate 120. Two inner seal plates 140 are interposed between the two outer seal plates 130, and the inner seal plates 140 connect the upper cover plate 110 and the lower cover plate 120.

It will be appreciated that the adjacent outer and inner seal plates 130, 140 define sliding chambers 160 between the upper and lower cover plates 110, 120 for movement of the primary telescoping support 200. Thus, in the present embodiment, two sliding chambers 160 are formed in the fixed bracket 100. The back plate 150 is disposed at an end of the sliding chamber 160 remote from the primary telescopic bracket 200, and is connected to the upper cover plate 110 and the lower cover plate 120.

Wherein the second horizontal direction Y is perpendicular to the first horizontal direction X. The vertical direction Z is perpendicular to the second horizontal direction Y and the first horizontal direction X.

Further, the upper cover plate 110 and the lower cover plate 120 are provided with a through hole 111, and the width of the through hole 111 is smaller than or equal to the interval between the two inner side sealing plates 140. Through the through holes 111 arranged on the upper cover plate 110 and the lower cover plate 120, the hollow-out opening 101 is formed on the fixing support 100, and the weight of the fixing support 100 is reduced. In addition, in the embodiment, the upper cover plate 110 and the lower cover plate 120 are formed by processing a whole plate, and are of an integral structure, compared with the prior art that the cover plate is divided into two independent plate structures, the fixing support provided by the embodiment is better in rigidity and higher in structural strength.

Referring to fig. 1, 2 and 3, the counterweight telescopic boom further includes a plurality of first mounting seats 170 for connecting with the turntable, where the first mounting seats 170 have two ear plates 171 arranged opposite to each other and a pin 172 disposed on the two ear plates 171. When the first mounting seat 170 is disposed near the upper side of the back plate 150 along the vertical direction Z, the two ear plates 171 of the first mounting seat 170 are respectively welded with the back plate 150 and the upper cover plate 110; when the first mount 170 is disposed near the lower side of the back plate 150 in the vertical direction Z, the two ear plates 171 of the first mount 170 are welded to the back plate 150 and the lower cover plate 120, respectively. Therefore, the stress of the first mounting seat 170 can be dispersed on the back plate 150 and the upper cover plate 110 or the lower cover plate 120, so that the structural strength is improved, and the service life is prolonged.

Further, the four first installation seats 170 are arranged, and each first installation seat 170 is installed on the rotary table through the corresponding pin shaft 172, so that the rotary table is connected through the four short pin shafts 172.

The two sides of the fixed support 100 are respectively provided with a reinforcing rib structure 102, and the reinforcing rib structures 102 extend from the back plate 150 of the fixed support 100 to the direction of the primary telescopic support 200. In this embodiment, the stiffener structure 102 is formed by four stiffeners around a square frame, and is respectively connected to the upper cover plate 110, the lower cover plate 120, the outer sealing plate 130, and the back plate 150. The stiffener structure 102 serves to increase the rigidity and strength of the structure of the mounting bracket 100.

In this embodiment, the primary telescopic bracket 200 has a "冂" shape so that the primary telescopic bracket 200 is installed in the two sliding chambers 160 of the two fixed brackets 100. In some embodiments, the secondary telescoping support 400 is "冂" shaped. Thus, two sliding chambers 160 for the movement of the secondary telescopic bracket 400 are also provided in the primary telescopic bracket 200.

In some embodiments, the cover plates of the primary 200 and secondary 400 telescoping supports may also be of unitary construction to increase structural strength and rigidity.

Referring to fig. 2 and 3, further, the sliding cavity 160 is a prismatic cavity having four sidewalls, wherein at least two sliding blocks 180 are disposed between each sidewall and the primary telescopic bracket 200. In the prior art, the fixing bracket 100 is generally provided with a sliding block 180 at each of four corners of the end surface, the contact area between the sliding block 180 and the telescopic bracket is limited, and the telescopic bracket is easy to deform and damage when receiving a large bending moment. The sliding block 180 arranged in the sliding cavity 160 can increase the contact area between the first-stage telescopic bracket 200 and the corresponding sliding block 180 and between the second-stage telescopic bracket 400 and the corresponding sliding block 180, reduce the pressure born by the sliding block 180, ensure that the first-stage telescopic bracket 200 and the second-stage telescopic bracket 400 are more stable in telescopic, and further prolong the service lives of the sliding block 180, the first-stage telescopic bracket 200 and the second-stage telescopic bracket 400.

In the present embodiment, a slider 180 is mounted on the fixed bracket 100 between the fixed bracket 100 and the primary telescopic bracket 200 through a bolt 181 and a screw fixing plate 182; between the primary telescopic bracket 200 and the secondary telescopic bracket 400, a slider 180 is mounted on the primary telescopic bracket 200 through a bolt 181 and a screw fixing plate 182.

Referring to fig. 1, 2 and 5, the first and second telescopic driving modules 300 and 500 are uniformly disposed on a center line M of the fixing bracket 100 along the first horizontal direction X. And the first and second telescopic driving modules 300 and 500 are disposed up and down in the vertical direction Z. That is, the first and second telescopic driving modules 300 and 500 are located in a vertical plane passing through the center line M. In this example, the fixing support 100, the primary telescopic support 200 and the secondary telescopic support 400 are symmetrical about the central line M, so that the arrangement mode of the first telescopic driving module 300 and the second telescopic driving module 500 can ensure that the gravity center of the whole counterweight telescopic boom is stable during working, and the gravity center of the counterweight telescopic boom is prevented from shifting to two sides to generate lateral tilting torque, so that the working stability of the counterweight telescopic boom is improved, and the service life is prolonged.

In this embodiment, the first telescopic driving module 300 is a first cylinder 300a, and the second telescopic driving module 500 is a second cylinder 500a. Of course, in some embodiments, the first telescopic driving module 300 and the second telescopic driving module 500 may also use an air cylinder, an electric cylinder, a linear motor, an electric push rod, or a screw motor to implement telescopic driving.

The first cylinder 300a and the second cylinder 500a are illustrated below, specifically as follows:

The first piston rod 310 of the first cylinder 300a is connected with the fixed bracket 100 through a second mounting seat 330, the first cylinder body 320 of the first cylinder 300a is mounted on the first-stage telescopic bracket 200 through a third mounting seat 340, and a first oil port and a second oil port connected with a first oil inlet pipe and a first oil return pipe are arranged on the first piston rod 310. That is, the first piston rod 310 of the first cylinder 300a is provided with a hydraulic oil channel, so that hydraulic oil can enter and exit the rod cavity and the rodless cavity of the first cylinder 320 to push the first piston rod 310 to extend and retract relative to the first cylinder 320.

It will be appreciated that since the first piston rod 310 is coupled to the fixed bracket 100, the first cylinder 320 will move in the first horizontal direction X relative to the primary telescopic bracket 200, and the first piston rod 310 will be stationary relative to the fixed bracket 100. The first oil inlet pipe and the first oil return pipe are connected with the corresponding first oil port and second oil port on the first piston rod 310, so that the first oil inlet pipe and the first oil return pipe are also static relative to the first piston rod 310. Therefore, on one hand, the first oil inlet pipe and the first oil return pipe are convenient to arrange, and the length required by pipeline arrangement is reduced; on the other hand, the first oil inlet pipe and the first oil return pipe do not stretch and retract along with the first oil cylinder 300a, so that the risk of hydraulic oil leakage at the interface is reduced.

The second piston rod 510 of the second cylinder 500a is connected to the second telescopic bracket 400 through the fourth mount 530, and the second cylinder body 520 of the second cylinder 500a is mounted on the first telescopic bracket 200 through the fifth mount 540.

Whereby both the first cylinder body 320 of the first cylinder 300a and the second cylinder body 520 of the second cylinder 500a are positioned on the first-stage telescopic bracket 200. Wherein the rod cavity of the first cylinder 320 is communicated with the rod cavity of the second cylinder 520 through the first bypass oil pipe 550, and the rod-free cavity of the first cylinder 320 is communicated with the rod-free cavity of the second cylinder 520 through the second bypass oil pipe 560. Thus, it can be understood that the first and second cylinders 300a and 500a can be simultaneously extended and retracted, thereby simultaneously extending and retracting the first and second telescopic supports 200 and 200. Furthermore, the first oil cylinder 300a is used for directly supplying oil to the second oil cylinder 500a, the second oil cylinder 500a is not required to be separately connected with an oil inlet pipe and an oil outlet pipe, the oil path layout is simplified, meanwhile, the first cylinder body 320 and the second cylinder body 520 are both positioned on the first-stage telescopic bracket 200, so that the first cylinder body 320 and the second cylinder body 520 can synchronously move along with the first-stage telescopic bracket 200, the first bypass oil pipe 550 and the second bypass oil pipe 560 are static relative to the first cylinder body 320 and the second cylinder body 520, and the risk of hydraulic oil leakage at an interface is reduced.

Referring to fig. 1, 2 and 6, in the present embodiment, two counterweight lifting modules 600 are provided. One end of the secondary telescopic bracket 400, which is far from the primary telescopic bracket 200, is provided with two assembly holes along the vertical direction Z. The weight lifting module 600 is inserted into the corresponding assembly hole and flange-connected with the secondary telescopic bracket 400. The balance weight is connected to lift through two balance weight lifting modules 600, so that stability is better.

Further, the counterweight lifting module 600 is a third cylinder 600a, and a flange portion 610 connected to the secondary telescopic bracket 400 is provided on the third cylinder 600 a. The third cylinder 600a is further connected with a second oil inlet pipe and a second oil return pipe.

The two-stage telescopic bracket 400 is further provided with a plurality of locking seats at one end close to the counterweight lifting module 600, and the locking seats are used for being connected with the counterweight through locking pins so as to fix the counterweight on the two-stage telescopic bracket 400, thereby realizing mechanical fixation of the counterweight.

The counterweight telescopic boom further comprises a drag chain mechanism 700, wherein the drag chain mechanism 700 is arranged on the fixed support 100, and the second oil inlet pipe and the second oil return pipe are both arranged on a flexible drag chain 710 of the drag chain mechanism 700.

It can be appreciated that when the primary telescopic bracket 200 and the secondary telescopic bracket 400 are telescopic, the flexible drag chain 710 of the drag chain mechanism 700 can protect and pull the built-in second oil inlet pipe and second oil return pipe, so that the second oil inlet pipe and the second oil return pipe can move orderly, thereby preventing the second oil inlet pipe and the second oil return pipe from contacting and wearing, bending, winding, knotting or interfering with the movement of the whole counterweight telescopic boom with the primary telescopic bracket 200 and the secondary telescopic bracket 400, and further prolonging the service life. The adoption of the drag chain mechanism 700 can further enable the oil circuit arrangement of the whole counterweight telescopic boom to be simpler, and the later maintenance, overhaul and cleaning are facilitated.

The embodiment also provides a crane. The crane comprises the counterweight telescopic boom provided by the invention. Wherein, the crane can be selected as an automobile crane or a crawler crane.

Compared with the prior art, the counterweight telescopic boom provided by the embodiment is characterized in that the first-stage telescopic bracket 200 is arranged on the fixed bracket 100, the second-stage telescopic bracket 400 is arranged on the first-stage telescopic bracket 200, the first-stage telescopic bracket 200 is driven to extend or retract along the first horizontal direction X relative to the fixed bracket 100 by the first telescopic driving module 300, and the second-stage telescopic bracket 400 is driven to extend or retract along the first horizontal direction X relative to the first-stage telescopic bracket 200 by the second telescopic driving module 500. Therefore, the counterweight telescopic boom provided in this embodiment has two-stage telescopic, under the cooperation of the first telescopic driving module 300 and the second telescopic driving module 500, the first-stage telescopic bracket 200 and the second-stage telescopic bracket 400 can be extended, so that a larger extension range can be obtained, and the counterweight can be applied to a crane to obtain a larger adjustment range in the first horizontal direction X, so that the crane has a larger lifting capacity.

Furthermore, the counterweight telescopic boom has secondary telescopic, if the maximum stroke of the counterweight telescopic boom is fixed with the maximum stroke of the primary telescopic boom 200 and the secondary telescopic boom 400 in the prior art, the whole crane is smaller in size after the primary telescopic boom is contracted, so that the crane can conveniently pass through narrow road conditions, and the flexibility is improved.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (11)

1. The utility model provides a balanced telescopic boom, is applied to in the hoist, its characterized in that, balanced telescopic boom includes:

a fixed bracket (100) with one end for being mounted on a turntable of the crane and the other end extending in a first horizontal direction (X) in a direction away from the turntable;

the first-stage telescopic bracket (200) is movably arranged on the fixed bracket (100);

The first telescopic driving module (300) is connected with the fixed bracket (100) and the primary telescopic bracket (200) and is used for driving the primary telescopic bracket (200) to extend or retract along the first horizontal direction (X) relative to the fixed bracket (100);

the second-stage telescopic bracket (400) is movably arranged on the first-stage telescopic bracket (200);

The second telescopic driving module (500) is connected with the primary telescopic bracket (200) and the secondary telescopic bracket (400) and is used for driving the secondary telescopic bracket (400) to extend or retract along the first horizontal direction (X) relative to the primary telescopic bracket (200); and

The counterweight lifting module (600) is arranged at one end of the secondary telescopic bracket (400) far away from the primary telescopic bracket (200).

2. The counterweight telescopic boom according to claim 1, wherein the fixed bracket (100) comprises:

An upper cover plate (110) and a lower cover plate (120) which are arranged in an aligned manner at intervals along the vertical direction (Z);

Two outer side sealing plates (130) arranged at intervals along a second horizontal direction (Y), wherein the two outer side sealing plates (130) are arranged between the upper cover plate (110) and the lower cover plate (120), and the outer side sealing plates (130) are connected with the upper cover plate (110) and the lower cover plate (120);

two inner side sealing plates (140) arranged at intervals along a second horizontal direction (Y), wherein the two inner side sealing plates (140) are arranged between the two outer side sealing plates (130), the inner side sealing plates (140) are connected with the upper cover plate (110) and the lower cover plate (120), and a sliding cavity (160) for the first-stage telescopic bracket (200) to move is formed between the adjacent outer side sealing plates (130), the inner side sealing plates (140), the upper cover plate (110) and the lower cover plate (120); and

And the back plate (150) is arranged at one end of the sliding cavity (160) far away from the primary telescopic bracket (200) and is connected with the upper cover plate (110) and the lower cover plate (120).

3. The counterweight telescopic boom according to claim 2, characterized in that at least two sliders (180) are arranged between each side wall of the sliding chamber (160) and the primary telescopic bracket (200).

4. The counterweight telescopic boom according to claim 1, wherein the first telescopic driving module (300) and the second telescopic driving module (500) are uniformly arranged on a center line (M) of the fixed bracket (100) along the first horizontal direction (X), and the first telescopic driving module (300) and the second telescopic driving module (500) are arranged up and down along a vertical direction (Z).

5. The counterweight telescopic boom according to claim 4, wherein the first telescopic drive module (300) is a first cylinder (300 a) and the second telescopic drive module (500) is a second cylinder (500 a);

A first piston rod (310) of the first oil cylinder (300 a) is connected with the fixed support (100), a first cylinder body (320) of the first oil cylinder (300 a) is arranged on the first-stage telescopic support (200), and a first oil port and a second oil port which are connected with a first oil inlet pipe and a first oil return pipe are arranged on the first piston rod (310);

A second piston rod (510) of the second oil cylinder (500 a) is connected with the second-stage telescopic bracket (400), and a second cylinder body (520) of the second oil cylinder (500 a) is arranged on the first-stage telescopic bracket (200);

The rod cavity of the first cylinder body (320) is communicated with the rod cavity of the second cylinder body (520) through a first bypass oil pipe (550), and the rod-free cavity of the first cylinder body (320) is communicated with the rod-free cavity of the second cylinder body (520) through a second bypass oil pipe (560).

6. The counterweight telescopic boom according to claim 1, wherein an end of the secondary telescopic bracket (400) away from the primary telescopic bracket (200) is provided with an assembly hole along a vertical direction (Z), and the counterweight lifting module (600) is inserted into the assembly hole and is in flange connection with the secondary telescopic bracket (400).

7. The counterweight telescopic boom according to claim 1 or 6, wherein the counterweight lifting module (600) is a third cylinder (600 a), and the third cylinder (600 a) is connected with a second oil inlet pipe and a second oil return pipe;

The counterweight telescopic boom further comprises a drag chain mechanism (700), the drag chain mechanism (700) is arranged on the fixed support (100), and the second oil inlet pipe and the second oil return pipe are both arranged on the drag chain mechanism (700).

8. The counterweight telescopic boom according to claim 1, wherein the fixed support (100), the primary telescopic support (200) and the secondary telescopic support (400) are all frame structures.

9. The counterweight telescopic boom according to claim 1, characterized in that a hollowed-out opening (101) penetrating in the vertical direction (Z) is formed in the middle of the fixed support (100), and the first telescopic driving module (300) is arranged in the hollowed-out opening (101).

10. The counterweight telescopic boom according to claim 1, wherein both sides of the fixed support (100) are provided with a reinforcing rib structure (102), and the reinforcing rib structure (102) extends from a back plate (150) of the fixed support (100) to the direction of the primary telescopic support (200).

11. Crane, characterized by comprising a counterweight telescopic boom according to any of claims 1-10.