MOBILE COUNTERWEIGHT MECHANISM OF A HOISTING MACHINE AS WELL AS A HOISTING MACHINE

Abstract

The present application relates to a mobile counterweight mechanism of a hoisting machine, comprising a support portion, a drive portion and a counterweight which is articulated to said support portion by means of a first articulation portion, said drive portion connected between said support portion and the counterweight so that said counterweight turns over outwards about said first articulation portion relative to a center of rotation of said hoisting machine, so as to increase a distance between a center of gravity of said counterweight and a center of rotation of said hoisting machine. The present application also relates to a hoisting machine. The present application raises a movement distance of a mobile counterweight and improves the overall stability of a hoisting machine in a turnover manner.

Claims

1. A mobile counterweight mechanism of a hoisting machine, comprising a support portion (2), a drive portion and a counterweight (1) which is articulated to said support portion (2) by means of a first articulation portion (3), said drive portion being connected between said support portion (2) and the counterweight (1), so that said counterweight (1) turns over outwards about said first articulation portion (3) relative to a center of rotation of said hoisting machine, so as to increase a distance between a center of gravity of said counterweight (1) and a center of rotation of said hoisting machine.

2. The mobile counterweight mechanism of a hoisting machine according to claim 1, wherein said drive portion comprises a drive cylinder (4), a cylinder block end of which is articulated to said support portion (2) by means of a second articulation portion (4′), a piston rod end of said drive cylinder (4) being articulated to said counterweight (1), such that said counterweight (1) is capable of turning over outwards about said first articulation portion (3) relative to a center of rotation of said hoisting machine, so as to increase a distance between a center of gravity of said counterweight (1) and a center of rotation of said hoisting machine.

3. The mobile counterweight mechanism of a hoisting machine according to claim 2, wherein said drive portion further comprises a slave cylinder (5), by means of which a piston rod end of said cylinder (4) is articulated to said counterweight (1), said follower cylinder (5) being capable of locking said counterweight (1) at an initial position and a post-turnover position of said counterweight (1).

4. The mobile counterweight mechanism of a hoisting machine according to claim 3, wherein a cylinder block end of said slave cylinder (5) is articulated to said support portion (2) by means of a third articulation portion, a piston rod end of said slave cylinder (5) being articulated to said counterweight (1) by means of a fourth articulation portion (7); a piston rod end of said drive cylinder (4) is articulated to a cylinder block of said salve cylinder (5) by means of a fifth articulation portion (6).

5. The mobile counterweight mechanism of a hoisting machine according to claim 4, wherein hydraulic control systems of said drive cylinder (4) and said slave cylinder (5) are independent from each other.

6. The mobile counterweight mechanism of a hoisting machine according to claim 5, wherein a hydraulic control system of said slave cylinder (5) comprises an oil tank (T), a first hydraulic control check valve (V1), a second hydraulic control check valve (V2) and an electromagnetic switch valve (S), a rod cavity of said slave cylinder (5) communicating with said oil tank (T) through said first hydraulic control check valve (V1), a rod-free cavity of said salve cylinder (5) communicating with said oil tank (T) through said second hydraulic control check valve (V2); said electromagnetic switch valve (S) is connected in parallel between said oil tank (T) and the rod cavity of said slave cylinder (5); said first hydraulic control check valve (V1) and said electromagnetic switch valve (S) are capable of effectuating locking said slave cylinder (5).

7. The mobile counterweight mechanism of a hoisting machine according to claim 1, wherein said support portion (2) is a winch box of said hoisting machine.

8. The mobile counterweight mechanism of a hoisting machine according to claim 1, wherein a center of gravity of said counterweight (1) at a post-turnover position is higher than that at its initial position.

9. The mobile counterweight mechanism of a hoisting machine according to claim 1, wherein said support portion (2) has an exterior vertical face, at a bottom end of which said first articulation portion (3) is located so that said counterweight (1) is capable of turning over 180° horizontally about said first articulation portion (3).

10. A hoisting machine, comprising the mobile counterweight mechanism of a hoisting machine according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is a schematic view of a counterweight movement manner of the prior art.

[0024] FIG. 2 is a schematic view of another counterweight movement manner of the prior art.

[0025] FIG. 3 is a schematic view of an embodiment of the mobile counterweight mechanism according to the present application.

[0026] FIG. 4 is a schematic view of a counterweight of an embodiment of the mobile counterweight mechanism after horizontal turnover according to the present application.

[0027] FIG. 5 is a view of hydraulic principles of a slave cylinder of an embodiment of the mobile counterweight mechanism according to the present application.

EMBODIMENTS

[0028] Next, the technical solution of the present application is further described in detail by means of the drawings and embodiments.

[0029] FIG. 3 is a schematic view of an embodiment of the mobile counterweight mechanism of a hoisting machine according to the present application, which comprises a support portion 2, a drive portion and a counterweight 1. The support portion here may be at a proper position of the hoisting machine, as long as bearing of the counterweight can be realized. The counterweight 1 is articulated to the support portion 2 by means of a first articulation portion 3, the drive portion is connected between the support portion 2 and the counterweight 1 so that the counterweight 1 turns over outwards about the first articulation portion 3 relative to a center of rotation of the hoisting machine, so as to increase a distance between a center of gravity of the counterweight 1 and a center of rotation of the hoisting machine. The technical means of current mobile counterweights are all present with the defect of a short movement distance, for example a movement distance of a guide rail type counterweight is restricted by rigidity of the guide rail, while the connection rod type solution is restricted by the stability of an action in the movement process. If the movement distance is short, it is not prominent for the effect of promoting the overall stability, and it is impossible to possess an actual value in use with respect to the cost increased by a mobile counterweight. Considering from the perspective of movement of a center of gravity, the present application uses a turnover counterweight solution, which presents the advantage of a great movement distance.

[0030] The drive portion is explained as follows. As shown in FIGS. 3 and 4, the drive portion comprises a drive cylinder 4, a cylinder block end of which is articulated to the support portion 2 by means of a second articulation portion 4′, a piston rod end of the drive cylinder 4 being articulated to the counterweight 1, such that the counterweight 1 is capable of turning over outwards about the first articulation portion 3 relative to a center of rotation of the hoisting machine, so as to increase a distance between a center of gravity of the counterweight 1 and a center of rotation of the hoisting machine. Certainly, as the drive portion is not only limited to a form of an cylinder, any drive structure capable of effectuating outward turnover of the counterweight may be used.

[0031] In order to ensure the stability, the drive portion further comprises a slave cylinder 5, by means of which a piston rod end of the drive cylinder 4 is articulated to the counterweight 1, and the slave cylinder 5 is capable of locking the counterweight 1 at an initial position and a post-turnover position of the counterweight 1. In this way, the follower cylinder is controlled to ensure that, at an initial position and a post-turnover position, the counterweight has a very stable support, thereby improving the stability of the system.

[0032] Specifically, a cylinder block end of the slave cylinder 5 is articulated to the support portion 2 by means of a third articulation portion 5′, a piston rod end of the slave cylinder 5 is articulated to the counterweight 1 by means of a fourth articulation portion 7; a piston rod end of the drive cylinder 4 is articulated to a cylinder block of the slave cylinder 5 by means of a fifth articulation portion 6. In the process of turning over the counterweight, the slave cylinder rotates about the third articulation portion 5′, and in such process, an extreme point of the piston thereof extends from a length of R1 to a length of R2, so as to adapt to a turnover action of the counterweight.

[0033] In order to facilitate better control, hydraulic control systems of the drive cylinder 4 and the slave cylinder 5 are independent from each other. Next, explanations are mainly made to a hydraulic system of the slave cylinder 5.

[0034] Specifically, as shown in FIG. 5, a hydraulic control system of the slave cylinder 5 comprises an oil tank T, a first hydraulic control check valve V1, a second hydraulic control check valve V2 and an electromagnetic switch valve S, a rod cavity of the slave cylinder 5 communicating with the oil tank T through the first hydraulic control check valve V1, a rod-free cavity of the slave cylinder 5 communicating with the oil tank T through the second hydraulic control check valve V2; the electromagnetic switch valve S is connected in parallel between the oil tank T and the rod cavity of the slave cylinder 5; the first hydraulic control check valve V1 and the electromagnetic switch valve S are capable of effectuating locking the slave cylinder 5. Thus, when a piston of the slave cylinder 5 extends, the electromagnetic switch valve S is opened so that hydraulic oil from the rod cavity flows back to the oil tank via the electromagnetic switch valve S; when the counterweight turns over to a designated position, the electromagnetic switch valve S is closed so that the electromagnetic switch valve S and the check valve prevent backflow of an oil path from the rod cavity to the oil tank so as to effectuate position locking; in the process of counterweight resetting, pressure oil flows back from the rod-free cavity to the oil tank T via a second hydraulic control check valve V2, and pressure oil enters the rod cavity from the oil tank via the first hydraulic control check valve V2, so as to effectuate contracting the piston rod of the slave cylinder.

[0035] For the aforementioned support portion 2, in one embodiment of the present application, the support portion 2 is a winch box of the hoisting machine.

[0036] In order to prevent interference caused by the counterweight to the bottom structure in the operation process, accordingly, in an embodiment, at a post-turnover position of the counterweight 1 relative to its initial position, a center of gravity of the counterweight 1 is raised.

[0037] At the same time, in order to ensure that the counterweight presents a favorable stability at a post-turnover position, the support portion 2 has an exterior vertical face, at a bottom end of which the first articulation portion 3 is located so that the counterweight 1 is capable of turning over 180° horizontally about the first articulation portion 3.

[0038] The present application also provides a hoisting machine, which comprises the aforementioned mobile counterweight mechanism.

[0039] Finally, it should be explained that: the aforementioned embodiments are only used to describe the technical solution of the present application rather than limiting the same; although detailed explanations are made to the present application by referring to preferred embodiments, a common technical person in the art should understand that: it is still possible to make amendments to the embodiments of the present application or make equivalent replacements to part of the technical features; without departing from the spirit and scope of the present application, they should all be covered in the scope of the technical solution for which protection is sought in the present application.