CN85200892U - Reversed scissor-type grabs - Google Patents

Abstract

The utility model discloses a reversed scissor-type grab which is a double-crushing plate grab. The start and the end positions of the scissors handles of the grab are opposite to the prior scissors grab, and a beam is fixed on the pivot shaft of the center hinge. A vertical reinforce pulley block controlled by a steel cable is composed by means of the scissors handles and the pulley wheels at the two ends of the beam. When the grab is closed, the two scissors handles swing downward near the horizontal direction. When the grab is opened, the two scissors handles swing upward near the vertical direction with each other. Adopting this structure can decrease the integral height of the grab, so the effective hoisting height of the crane can be increased. The grab can be made into single-hinged type structure or made into double-hinged type structure.

Description

Reversed scissor-type grabs

The present invention relates to a kind of two jaw plates grab buckets that thing is used of on hoisting crane, getting, particularly a kind of improved scissors grab.

(correlation technique has HOII P No. 6711272 to existing scissors grab, No. 1545591, British patent, No. 2924628, German patent with No. 3030472) compare advantage such as it is few to have a hinge-point, and bucket body is stable when being easy to obtain bigger aperture and work with traditional long strut grab bucket.But show that according to the practice in China in recent years it also exists following major defect:

1. scissors grab is in initial stage of gripping, because two cut near level, therefore formed shearing arm is very little, thereby the extracting performance when making the starting stage is very low;

2. the center hinge owing to most of scissors grabs all needs to solve the problem of hinging pin shaft transfer torque, thereby makes the structure of center hinge become complicated, and heaviness is made with being difficult to.Though there is the center hinge of minority scissors grab to adopt the not pivoting structure of transfer torque, can makes that like this aperture of scissors grab is restricted, so that be unfavorable for giving full play to of the ability that grasps;

3. scissors grab need use hanging beam could be connected with the hoist rope of hoisting crane with four hoist cables, this just not only makes the deadweight that the grab bucket structure is too loaded down with trivial details and the increase grab bucket can not utilize, and because hanging beam and hoist cable are around the top of bucket body and all around, when grab bucket work, hanging beam and hoist cable are easy to disturb with bucket body, and often cause the damage of hoist cable, cause work reliable inadequately.

The existence of above-mentioned shortcoming also is that existing scissors grab is still failed one of reason that is widely adopted so far.

The objective of the invention is to provide a kind of novel grab bucket that can overcome existing scissors grab shortcoming.

The objective of the invention is to reach: make the jaw connecting arm of grab bucket center on the cut handle of hinge work to the direction bending extension Cheng Nengyu jaw that deviates from bucket lip with side oscillation in the hinged place by following manner, cut and rely on level when closing bucket, being separated from each other to lower swing, opening the bucket back draws close in vertical direction, and can open the hanger of bucket operation with the hoist rope direct connection cutting the end is connected with, on the articulation pivot of two connecting arms, be equipped with one with cut being in conplane channel crossbar, two cut and pulley (one or several) respectively is equipped with at the channel crossbar two ends, it is twined by steel cable each other, and common composition can make the closed vertical reinforcement assembly pulley of grab bucket.Like this, when grab bucket is opened entirely, generally can be not more than 110 ° owing to cut the angle that is constituted between handle and channel crossbar, thereby just can make grab bucket when beginning to grasp, obtain bigger shearing arm, and in continuing the extracting process, remaining the trend that increases the shearing arm.And since grab bucket of the present invention cut and connecting arm all in the same side around the hinge swing, thereby under the situation that can guarantee to make grab bucket obtain big aperture, can adopt simply, do not need the pivoting articulated structure of transfer torque.In addition, because that work the time is cut a swaying direction is different with scissors grab, thereby crane hoisting wire rope need adopt hanging beam and four hoist cables with just no longer resembling existing scissors grab being connected of grab bucket, only needs directly and cuts a hanger of holding and be connected just.

According to the structural principle of grab bucket of the present invention, except the grab bucket that can manufacture single hinge formula structure, can also manufacture grab bucket with symmetrical pair of hinge formula structure.

The present invention is further elaborated referring now to following accompanying drawing.

In the accompanying drawings:

Fig. 1 is the front elevation of grab bucket of the present invention when opening entirely;

Fig. 2 is the cutaway view along the A-A of Fig. 1;

Front elevation when Fig. 3 is a grab bucket complete closure of the present invention;

Fig. 4 is the typical winding figure of the reinforcement assembly pulley of grab bucket of the present invention;

Fig. 5 is the grab bucket figure of the present invention that adopts two hinge formula structures.

The basic structure composition situation of grab bucket of the present invention is: two jaw (1) and (2) that hold material, and the bottom of connecting arm (3) is connected with jaw (1), and the bottom of connecting arm (4) is connected with jaw (2).Connecting arm is cut handle in being called with top of hinge, respectively to cut (5) and to cut (6) expression.Connecting arm with cut being one, the needs of visual manufacturing are taked the whole technology of making or making respectively.On cutting (5) and cutting, pulley (7) and pulley (8) are housed, and are connected with hanger (9) and hanger (10) in its end (6).Steel rope (11) and (12) are to cut joining with two by the bearing pin (13) and the bearing pin (14) that are enclosed within on the hanger.

Hinged and the basic comprising crossbeam position is: connecting arm (3) and connecting arm (4) are formed articulated structure with pivot (15) and antifriction-bearing box (or plain bearing) (17), the connecting arm (3) that wherein is positioned at the outside can be without the bearing support, but directly and pivot be fixed together, middle part in pivot (15), sky is overlapping channel crossbar (18), and by plain bearing (19) Steel cable pulley (20) is propped up simultaneously and hold.Pulley (21) and (22) are equipped with in the end of channel crossbar (18).Use steel rope (23), the pulley that will cut on handle and the crossbeam by assembly pulley winding shown in Figure 4 winds up to constitute the reinforcement assembly pulley.By means of snap ring (16) steel rope (11) is connected with the hoist rope of hoisting crane with (12) simultaneously, use snap ring (24) that the closed steel rope of two fag ends of steel rope (23) and hoisting crane is connected together again, just might realize the opening and closing operations of grabbing bucket.

When needs make grab bucket closed, can loosen the hoist rope of hoisting crane, steel rope (11) and (12) are loosened, then the closed steel rope (23) of hoisting crane is rolled, at this moment, two cut just can be opposing separately around center hinge to lower swing, and draw close, till the bucket lip mouth on two jaws contacts towards crossbeam (18).Again when grab bucket can lived the braking of the hoist rope reel on the hoisting crane or the rolled-up while when closure state becomes open configuration, closed steel rope is loosened, at this moment, because the deadweight effect of grab bucket, two jaws just separate voluntarily, two cut also just upwards swing is also close mutually around center hinge, till the final position is blocked by check plate (27).

Adopt the grab bucket of the present invention of two-hinged structure, its structural principle is identical with the principle of single hinge structure. Difference is, single hinge structure is that two jaw linking arms only connect with a pivot with crossbeam, two-hinged structure then is with two pivots two jaw linking arms to be connected with crossbeam respectively, the outside linking arm that this moment, former list cut with scissors, also need to be equipped with the parts such as bearing, carrying roller, two pivotally connected positions in former central point bilateral symmetry separately link together with crossbeam as interior linking arm. In addition, when opening and closing, only have single-degree-of-freedom for making grab bucket, fixed a pair of intermeshing sector gear (25) and (26) take pin joint as pivot. To the grab bucket of two-hinged structure, because two linking arms about it are identical, this is to making and using more convenient.

Can find out that from above-mentioned grab bucket of the present invention is to overcome the shortcoming of existing scissors grab. In addition, it also has following three advantages:

Since this grab bucket after closing bucket, it cuts handle is near level, and does not have hanging beam, therefore, its bucket body height after closing bucket is more much smaller than the bucket body height of existing scissors grab; And when need increasing when cutting the length of handle, the bucket body size of this grab bucket mainly is to increase in the horizontal direction, rather than directly increase is in vertical direction to resemble existing scissors grab. Therefore, when using this grab bucket, can make crane obtain bigger effective hoisting depth;

This grab bucket to open bucket moment be from big to small, therefore opening bucket and being easy to realize, and when opening bucket and finish, also can not resemble existing scissors grab is to produce from small to large big impact because holding bucket moment, so that often makes out the check plate damage that struggles against;

Since this grab bucket in the extracting process, it is cut to the bottom, the potential energy that the weight of therefore cutting is obtained when holding bucket just can discharge, and changes the power of extracting into, this just can reduce the deadweight degree of utilization that power waste and raising are grabbed bucket.

Therefore this grab bucket all is better than existing scissors grab at several major technology aspect of performances, so it will be more more advanced and practical than existing scissors grab.

It is worthy of note,, can obtain multiple concrete structure under the situation of the principle of the invention.For example: the reinforcement assembly pulley can adopt different multiplying powers, adopts different steel ropes to twine method; A connecting arm and the single plate structure cut also can apparent intensity need and increase reinforcement or replace with the thin-walled box-structure.In addition, can find out obviously that this grab bucket both can be used on the duplex type hoisting crane, can on four rope hoisting cranes, use too.

Claims (4)

1, a kind of by jaw [1] and [2], connecting arm [3] and [4], cut the inverted scissor type that thing uses of on hoisting crane, getting that [5] and [6], hanger [9] and [10], articulation pivot [15], channel crossbar [18], Steel cable pulley [20] and pulley [7], [8], [21], [22] are formed and grab bucket.

Feature of the present invention is:

The connecting arm [3] of the jaw of A, grab bucket [1] and [2] and [4] are done cutting [5] and [6] with side oscillation to the direction bending extension Cheng Nengyu jaw that deviates from bucket lip around hinge-point in the hinged place;

B, cut the end of [5] and [6] is had hanger [9] and [10] that are used to be connected hoist rope;

Be equipped with on [15] one or two of the articulation pivot of C, connecting arm [3] and [4] one with cut being in conplane channel crossbar [18], the channel crossbar two ends be equipped with pulley [21] and [22] one or several, they with cut that one or several one are reinstated steel rope [23] and twine last pulley [7] and [8], constitute and be positioned at the grab bucket vertical reinforcement assembly pulleys of closure of making jointly of two symmetry ends;

2, inverted scissor type grab bucket according to claim 1, the horizontal section that it is characterized in that channel crossbar (18) is a flute profile, and is vertically curved slightly, and the middle part of two flange plates is provided with the seat hole of energy device articulation pivot (15), and two symmetry ends are provided with pulley axle bed hole;

3, inverted scissor type grab bucket according to claim 1 is characterized in that connecting arm (3) and (4) and pivot (15) are hinged, is fixed with to make correct quadrant gear (25) and (26) that open and close of grab bucket on the circumference at hinged center;

4, inverted scissor type grab bucket according to claim 1 is characterized in that being equipped with on the articulation pivot (15) Steel cable pulley of being supported by plain bearing (20).

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