CN211665826U

CN211665826U - Grab bucket deviation correcting device, grooving machine grab bucket and grooving machine

Info

Publication number: CN211665826U
Application number: CN201922339432.6U
Authority: CN
Inventors: 安贵平; 张福鹏; 陈兆鲁
Original assignee: Beijing Sany Intelligent Technology Co Ltd
Current assignee: Beijing Sany Intelligent Technology Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-10-13
Anticipated expiration: 2029-12-23

Abstract

The utility model relates to a grooving machine technical field especially relates to a grab bucket deviation correcting device, grooving machine grab bucket and grooving machine. The grab bucket deviation correcting device comprises a deviation correcting body, a first driving mechanism and a second driving mechanism, wherein the first driving mechanism and the second driving mechanism are respectively connected between the deviation correcting body and a supporting frame; the first driving mechanism and the second driving mechanism can drive the two ends of the deviation rectifying body to move in the same amplitude or different amplitudes along the opening and closing direction of the grab bucket, so that the deviation rectifying body and the advancing direction of the grab bucket are parallel to each other or form an included angle. The grab bucket of the grooving machine comprises the grab bucket deviation correcting device. The grooving machine comprises the grab bucket of the grooving machine. This grab bucket deviation correcting device, this trenching machine grab bucket and this trenching machine can drive the both ends of body of rectifying remove the same range or not range along the direction of opening and shutting of grab bucket, improve the flexibility and the variety of the body turned angle of rectifying, make the body of rectifying coincide with the support wall body constantly to improve the support area, improve the straightness that hangs down of the stability, the precision and the trenching of rectifying the operation.

Description

Grab bucket deviation correcting device, grooving machine grab bucket and grooving machine

Technical Field

The utility model relates to a grooving machine technical field especially relates to a grab bucket deviation correcting device, grooving machine grab bucket and grooving machine.

Background

At present, a continuous wall grab bucket is one of main devices for underground grooving, and in the grooving operation process, due to the fact that the underground condition is complex, a grabbed wall body is prone to have certain deflection, construction quality is affected, and therefore the grab bucket needs to be guaranteed to be in a vertical state to avoid the grabbed wall body from deflecting.

In the related art, as shown in fig. 1, a double-push-plate combination mode is usually adopted to correct the left and right of the grab bucket, however, the left-right deviation rectifying mode adopts a parallelogram mechanism, as shown in fig. 2, the working principle of the left-right deviation rectifying mechanism is that two connecting rods 1 'are hinged with a push plate 2', a power source 3 'can extend or shorten, the two connecting rods 1', the push plate 2 'and a frame body 4' form the parallelogram mechanism, when the power source 3 ' is pushed out and retracted, the plate surface of the push plate 2 ' is always kept parallel to the frame body 4 ', the angle between the frame body 4 ' and the push plate 2 ' cannot be adjusted, under the condition that the frame body 4 'is ensured to be vertical, the push plate 2' for supporting the supporting wall body is also kept in the vertical state, when the supporting wall body is inclined, the push plate 2' cannot be matched with the supporting wall body, so that the supporting area is too small, and the verticality of the subsequently grabbed wall body is adversely affected.

SUMMERY OF THE UTILITY MODEL

A first object of the utility model is to provide a grab bucket deviation correcting device to solve among the prior art because the push pedal remains parallel with the support body throughout, when the support wall body deflection appears, the push pedal can not coincide with the support wall body and cause the technical problem of supporting area undersize.

A second object of the utility model is to provide a grooving machine grab bucket to solve among the prior art because grab bucket deviation correcting device's push pedal and support body remain parallel throughout, when the support wall body incline appears, the push pedal can not coincide with the support wall body, thereby causes the technical problem of support area undersize.

A third object of the present invention is to provide a trenching machine to solve the technical problem of the prior art that the support wall cannot be matched with the push plate because the push plate of the grab deviation correcting device is always parallel to the support body, when the support wall is inclined, the support area is too small.

In order to achieve the above object, the present invention provides the following technical solutions;

based on the first purpose, the utility model provides a grab bucket deviation correcting device, which comprises a deviation correcting body, a first driving mechanism and a second driving mechanism, wherein the first driving mechanism and the second driving mechanism are respectively connected between the deviation correcting body and a supporting frame;

the first driving mechanism and the second driving mechanism can drive the two ends of the deviation rectifying body to move in the opening and closing direction of the grab bucket by the same amplitude or different amplitudes, so that the deviation rectifying body and the advancing direction of the grab bucket are parallel to each other or form an included angle.

In any of the above technical solutions, optionally, the first driving mechanism includes a first telescopic member that can be extended or shortened along an opening and closing direction of the grapple, and the second driving mechanism includes a second telescopic member that can be extended or shortened along the opening and closing direction of the grapple;

the two ends of the first telescopic member and the second telescopic member are respectively movably connected with the grab bucket and the deviation rectifying body.

In any of the above technical solutions, optionally, the first driving mechanism further includes a first linkage rod, and the second driving mechanism further includes a second linkage rod;

the two ends of the first linkage rod and the second linkage rod are respectively movably connected with the grab bucket and the deviation rectifying body.

In any of the above technical solutions, optionally, the deviation rectification device further includes a support frame for connecting to a side of the grab bucket;

two ends of the first telescopic member are respectively hinged with the support frame and the deviation correcting body;

the two ends of the first linkage rod are respectively hinged with the support frame and the deviation rectifying body, and a hinged shaft between the first linkage rod and the deviation rectifying body is a hinged shaft between the first telescopic component and the deviation rectifying body.

In any of the above technical solutions, optionally, two ends of the second telescopic member are respectively hinged to the support frame and the deviation rectifying body, the second driving mechanism further includes a sliding member, two ends of the second linkage rod are respectively hinged to the sliding member and the support frame, and the sliding member is slidably connected to the deviation rectifying body.

In any of the above technical solutions, optionally, an articulated shaft between the second telescopic member and the deviation rectifying body is an articulated shaft between the second linkage rod and the sliding member.

In any of the above technical solutions, optionally, the sliding member moves between a first position and a second position relative to the deviation rectifying body;

the distance between the first telescopic member and the hinged position of the second telescopic member and the support frame is a first distance, the distance between the joint of the first telescopic member and the deviation correcting body and the first position is a second distance, and the distance between the joint of the first telescopic member and the deviation correcting body and the second position is a third distance;

the second distance is less than the first distance, and the first distance is less than the third distance.

Based on above-mentioned second purpose, the utility model provides a grooving machine grab bucket, the grab bucket deviation correcting device that provides including above-mentioned arbitrary technical scheme.

In any one of the above technical solutions, optionally, the grab bucket of the trenching machine further includes a support frame and a grab bucket, and the grab bucket can reciprocate along the length direction of the support frame;

a first driving mechanism and a second driving mechanism of the grab bucket deviation correcting device are respectively connected to the supporting frame;

along the opening and closing direction of the grab bucket, the deviation rectifying body is abutted with the supporting wall body.

Based on the third purpose, the utility model provides a grooving machine, including the grooving machine grab bucket that any technical scheme provided above provided.

Adopt above-mentioned technical scheme, the beneficial effects of the utility model are that:

the utility model provides a grab bucket deviation correcting device is including rectifying body, first actuating mechanism and second actuating mechanism. The first driving mechanism and the second driving mechanism can drive the two ends of the deviation rectifying body to move in the same amplitude or different amplitudes along the opening and closing direction of the grab bucket, so that the deviation rectifying body is parallel to the advancing direction of the grab bucket or an included angle is formed, and the flexibility and diversity of angles formed by the deviation rectifying body relative to the grab bucket are improved. No matter the support wall extends along the vertical direction or deviates from the vertical direction, the deviation rectifying body can be matched with the support wall constantly so as to improve the support area, and further improve the stability and the precision of deviation rectifying operation and the verticality of grooving.

The utility model provides a grooving machine grab bucket includes this grab bucket deviation correcting device, therefore can realize all beneficial effects that this grab bucket deviation correcting device realized.

The utility model provides a grooving machine includes this grooving machine grab bucket, therefore can realize all beneficial effects that this grooving machine grab bucket can realize.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a deviation rectifying device for a grab bucket in the related art;

FIG. 2 is a schematic diagram of the deviation rectification apparatus of the grab of FIG. 1;

fig. 3 is a schematic view of a first structure of a deviation correcting device for a grab bucket according to an embodiment of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is an enlarged view of the portion B of FIG. 3;

fig. 6 is a second schematic structural diagram of the grab bucket deviation correcting device according to the first embodiment of the present invention;

fig. 7 is a schematic structural diagram of a deviation correcting device for a grab bucket according to a first embodiment of the present invention;

fig. 8 is a schematic view of a first state of the grab bucket deviation correcting device according to the first embodiment of the present invention;

fig. 9 is a schematic diagram of a second state of the grab bucket deviation correcting device according to the first embodiment of the present invention;

fig. 10 is a schematic diagram of a third state of the grab bucket deviation correcting device according to the first embodiment of the present invention;

fig. 11 is a schematic view of a grab bucket of a trenching machine according to a second embodiment of the present invention in a first state;

fig. 12 is a schematic view of a grab bucket of a trenching machine according to a second embodiment of the present invention.

The icons of fig. 1 and 2: 1' -a connecting rod; 2' -push plate; 3' -a power source; 4' -a frame body.

The icons of fig. 3 to 12: 1-a grab bucket deviation rectifying device; 10-correcting the error body; 12-a first drive mechanism; 120-a first telescoping member; 121-a first linkage rod; 13-a second drive mechanism; 130-a second telescoping member; 131-a second trace; 132-a slide; 2-grab bucket of grooving machine; 20-grab bucket; 3-supporting the wall; 4-a support frame.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

The grab bucket deviation correcting device that this embodiment provided is used for the grooving machine grab bucket of grooving machine.

Referring to fig. 3 to 10 in combination with fig. 11 and 12, the deviation rectification device 1 for a grab bucket according to the present embodiment includes a deviation rectification body 10, a first driving mechanism 12, and a second driving mechanism 13.

As shown in fig. 3 and 6, the first driving mechanism 12 and the second driving mechanism 13 are respectively used for being connected between the rectifying body 10 and the grab bucket 20.

Optionally, the first driving mechanism 12 and the second driving mechanism 13 are respectively connected to two ends of the deviation rectifying body 10.

The first driving mechanism 12 and the second driving mechanism 13 can drive the two ends of the deviation rectifying body 10 to move in the opening and closing direction of the grab bucket 20 by the same amplitude or different amplitudes, so that the advancing directions of the deviation rectifying body 10 and the grab bucket 20 are parallel to each other or form an included angle.

It is worth explaining that the advancing direction of the grapple 20 is the vertical direction, as in the a direction in fig. 11 and 12. The opening and closing direction of the grapple 20 is a direction perpendicular to both the pivoting direction and the vertical direction of the grapple 20, such as the b direction in fig. 11 and 12.

Optionally, the grapple rectifying device further comprises a support frame 4, and the support frame 4 is used for being connected to the side of the grapple. Specifically, under the grooving construction state, it is necessary to keep the support frame 4 in a vertical state to drive the grab bucket 20 through the support frame 4 to be kept in a vertical posture, thereby ensuring that the grooving direction is a vertical direction. As shown in fig. 8 and 11, if the supporting wall 3 extends in the vertical direction, the first driving mechanism 12 and the second driving mechanism 13 drive the two ends of the deviation rectifying body 10 to move in the opening and closing direction of the grab bucket 20 by the same amplitude, so that the deviation rectifying body 10 is parallel to the supporting frame 4, that is, the deviation rectifying body 10 is parallel to the supporting wall 3, and the deviation rectifying body 10 can be completely matched with the supporting wall 3; as shown in fig. 12, if the supporting wall 3 deviates from the vertical direction, the first driving mechanism 12 and the second driving mechanism 13 drive the two ends of the deviation rectifying body 10 to move in the opening and closing direction of the grab 20 by different magnitudes, so that the deviation rectifying body 10 forms an angle with the supporting frame 4 until the deviation rectifying body 10 moves to be parallel to the supporting wall 3, so as to ensure that the deviation rectifying body 10 is completely matched with the supporting wall 3.

That is to say, no matter the support wall 3 extends along the vertical direction or deviates from the vertical direction, the deviation rectifying body 10 can be driven by the first driving mechanism 12 and the second driving mechanism 13 together, so that the deviation rectifying body 10 can move to be parallel to the propelling direction of the grab bucket 20 or to be in an included angle state, so as to ensure that the deviation rectifying body 10 is completely attached to the support wall 3. As shown in fig. 8 to 10, the deviation rectifying body 10 can be constantly fitted to the supporting wall 3 to increase the supporting area on the premise of ensuring that the grab bucket 20 is in the vertical posture.

In the embodiment of the deviation correcting device 1 for the grab bucket, on one hand, the first driving mechanism 12 and the second driving mechanism 13 drive the deviation correcting body 10 together, so that the driving direction and the driving amplitude of each driving mechanism can be controlled independently, and the control difficulty of the deviation correcting mechanism for the grab bucket 20 can be reduced by cooperation of the two driving mechanisms. On the other hand, because first actuating mechanism 12 and second actuating mechanism 13 can drive the both ends of the body 10 of rectifying and move the same range or different ranges along the direction of opening and shutting of grab bucket 20, improve the flexibility and the variety that the body 10 of rectifying and become for support frame 4 and become angled, both can guarantee that grab bucket 20 is in vertical gesture, can make the body 10 of rectifying coincide with support wall 3 constantly again, in order to improve the support area, and then not only can improve the stability and the precision of the operation of rectifying, but also can improve the straightness that hangs down in grooving.

In an alternative of the present embodiment, as shown in fig. 4, the first driving mechanism 12 includes a first telescopic member 120 that can be extended or shortened in the opening and closing direction of the grapple 20, and as shown in fig. 5, the second driving mechanism 13 includes a second telescopic member 130 that can be extended or shortened in the opening and closing direction of the grapple 20; the two ends of the first telescopic member 120 and the second telescopic member 130 are movably connected with the support frame 4 and the deviation rectifying body 10 respectively.

Specifically, when the extension and retraction amplitudes and the extension and retraction directions of the first extension member 120 and the second extension member 130 are the same, the deviation rectifying body 10 is parallel to the support frame 4; by adjusting the difference between the extension and retraction range and the extension and retraction direction of the first extension member 120 and the second extension member 130, the support frame 4 can be always attached to the support wall 3 while the correction body 10 is kept in a vertical state.

In an alternative of this embodiment, as shown in fig. 4 and 5, the first driving mechanism 12 further includes a first linkage rod 121, and the second driving mechanism 13 further includes a second linkage rod 131; two ends of the first linkage rod 121 and the second linkage rod 131 are respectively movably connected with the support frame 4 and the deviation rectifying body 10.

By arranging the first linkage rod 121 and the second linkage rod 131, on one hand, the first linkage rod 121 and the second linkage rod 131 are supported between the support frame 4 and the deviation rectifying body 10, so that the overall structural strength of the grab bucket deviation rectifying device 1 can be improved; on the other hand, by limiting the lengths of the first linkage rod 121 and the second linkage rod 131 and the connection positions between the deviation rectifying body 10 and the support frame 4, the movement stroke of the deviation rectifying body 10 relative to the support frame 4 can be limited, and the controllability of the grab bucket deviation rectifying device 1 is improved.

In an alternative of this embodiment, as shown in fig. 7, two ends of the first telescopic member 120 are respectively hinged with the supporting frame 4 and the deviation rectifying body 10; two ends of the first linkage rod 121 are respectively hinged with the support frame 4 and the deviation rectifying body 10, and a hinge shaft between the first linkage rod 121 and the deviation rectifying body 10 is a hinge shaft between the first telescopic member 120 and the deviation rectifying body 10.

The first telescopic member 120 and the first linkage rod 121 are hinged to the deviation rectifying body 10 through the same hinge shaft, and in the process that the first telescopic member 120 is telescopic and rotates, the first telescopic member 120, the support frame 4 and the first linkage rod 121 form a triangle all the time, so that the deviation rectifying body 10 can be stably supported at any time.

In an alternative embodiment, as shown in fig. 7, the two ends of the second telescopic member 130 are hinged to the supporting frame 4 and the correcting body 10, respectively, and the second driving mechanism 13 further includes a sliding member 132. The two ends of the second linking rod 131 are respectively hinged to the sliding member 132 and the supporting frame 4, and the sliding member 132 is slidably connected to the deviation rectifying body 10. Through setting up slider 132, make second trace 131 and first trace 121 respectively and the articulated shaft between the body 10 of rectifying a deviation between the distance can change to when the body 10 of rectifying a deviation forms the contained angle for support frame 4, also can play the supporting role through first trace 121 and second trace 131, can avoid first trace 121 and second trace 131 to be parallel all the time, and then avoid rectifying a deviation the body 10 and only can remove with the mode that is parallel with support frame 4.

Optionally, the sliding member 132 is a sliding block, and a sliding groove is formed on the surface of the deviation rectifying body 10 facing the support frame 4, and the sliding block is slidably embedded in the sliding groove.

Optionally, the rectification body 10 is a rectification plate.

In an alternative of this embodiment, the hinge shaft between the second telescopic member 130 and the deviation rectifying body 10 is the hinge shaft between the second linking rod 131 and the sliding member 132. That is, the second telescopic member 130 and the second linking rod 131 are hinged to the sliding member 132 through the same hinge shaft, and are connected to the deviation rectifying body 10 through the sliding member 132. Not only is the structure simplified, but also the controllability of the grab bucket deviation rectifying device 1 can be improved.

Specifically, the joint of the support frame 4 and the sliding member 132 forms a first hinge point between the deviation rectifying body 10 and the grab bucket 20, and the hinge shafts of the support frame 4, the first link rod 121 and the first telescopic member 120 form a second hinge point between the deviation rectifying body 10 and the grab bucket 20. As shown in fig. 9, when the second telescopic member 130 does not operate, the supporting frame 4, the second telescopic member 130 and the second linking rod 131 form a stable triangle, the first hinge point forms a stable fulcrum, and the deviation rectifying body 10 can be controlled to rotate around the stable fulcrum by controlling the first telescopic member 120 to extend and retract. Similarly, as shown in fig. 10, when the first telescopic member 120 does not operate, the supporting frame 4, the first linkage rod 121 and the first telescopic member 120 form a stable triangle, the second hinge point forms a stable pivot, and the deviation rectifying body 10 can be controlled to rotate around the stable pivot by controlling the second telescopic member 130 to extend and retract. It is understood that the first telescoping member 120 and the second telescoping member 130 can be controlled to telescope simultaneously according to specific motion requirements.

In an alternative of this embodiment, the slide 132 moves between a first position and a second position relative to the corrective body 10. The distance between the hinged parts of the first telescopic member 120 and the second telescopic member 130 and the support frame 4 is a first distance, the distance between the joint of the first telescopic member 120 and the rectification body 10 and the first position is a second distance, and the distance between the joint of the first telescopic member 120 and the rectification body 10 and the second position is a third distance; the second distance is less than the first distance, and the first distance is less than the third distance.

In other words, a quadrangle formed by the first telescopic member 120, the support frame 4, the second telescopic member 130 and the deviation rectifying body 10 is defined as a deviation rectifying quadrangle, and the side length of the deviation rectifying quadrangle corresponding to the support frame 4 may be larger than the side length of the deviation rectifying quadrangle corresponding to the deviation rectifying body 10, so that the deviation rectifying body 10 moves forward relative to the support frame 4, specifically, the deviation rectifying body 10 moves forward along the opening and closing direction of the grab bucket 20 and the length direction of the support frame 4. And the side length of the deviation-correcting quadrangle corresponding to the support frame 4 can be smaller than the side length of the deviation-correcting quadrangle corresponding to the deviation-correcting body 10, so that the deviation-correcting body 10 moves reversely relative to the support frame 4, specifically, the deviation-correcting body 10 moves reversely along the opening and closing direction of the grab bucket 20 and the length direction of the support frame 4. Thereby through injecing first position and second position, can guarantee to rectify the body 10 and can also can rectify to reverse to rectifying to the forward, and then improve this grab bucket deviation correcting device 1's the nimble degree of rectifying.

Example two

The second embodiment provides a grab bucket of a trenching machine, the second embodiment comprises the grab bucket deviation correcting device in the first embodiment, the technical characteristics of the grab bucket deviation correcting device disclosed in the first embodiment are also applicable to the first embodiment, and the technical characteristics of the grab bucket deviation correcting device disclosed in the first embodiment are not described repeatedly.

Referring to fig. 11 and 12 in combination with fig. 3 to 10, the grab bucket 2 of the trenching machine provided by the embodiment includes a grab bucket and a grab bucket deviation rectifying device 1 provided by the first embodiment. Wherein the grab 20 can be pushed in the vertical direction deep into the ground for grabbing and trenching by the grab 20. The deviation rectifying body 10 of the grab bucket deviation rectifying device 1 is always abutted against the supporting wall 3, so that the supporting area of the supporting wall 3 can be increased.

In the alternative of this embodiment, the quantity of grab bucket deviation correcting device 1 is two, and two grab bucket deviation correcting device 1 connect respectively in the both sides of grab bucket, can further improve the support area to improve the precision of rectifying.

The grab bucket of the trenching machine in the embodiment has the advantages of the grab bucket deviation correcting device in the first embodiment, and the advantages of the grab bucket deviation correcting device disclosed in the first embodiment are not described repeatedly.

EXAMPLE III

The third embodiment provides a trenching machine, the grab bucket of the trenching machine in the second embodiment is included, the technical characteristics of the grab bucket of the trenching machine disclosed in the second embodiment are also applicable to the third embodiment, and the technical characteristics of the grab bucket of the trenching machine disclosed in the second embodiment are not described repeatedly.

The trenching machine provided by the embodiment comprises the grab bucket of the trenching machine in the second embodiment.

The grab bucket of the trenching machine in the embodiment has the advantages of the grab bucket of the trenching machine in the second embodiment, and the advantages of the grab bucket of the trenching machine disclosed in the second embodiment are not described repeatedly.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Claims

1. A grab bucket deviation correcting device is characterized by comprising a deviation correcting body, a first driving mechanism and a second driving mechanism, wherein the first driving mechanism and the second driving mechanism are respectively connected between the deviation correcting body and a grab bucket;

2. The device according to claim 1, wherein the first driving mechanism comprises a first telescopic member capable of extending or shortening along an opening and closing direction of the grab bucket, and the second driving mechanism comprises a second telescopic member capable of extending or shortening along the opening and closing direction of the grab bucket;

3. The apparatus as claimed in claim 2, wherein the first driving mechanism further comprises a first linkage rod, and the second driving mechanism further comprises a second linkage rod;

4. The grab correcting device of claim 3, further comprising a support frame for connecting to the side of the grab;

5. The grab bucket deviation correcting device of claim 4, wherein two ends of the second telescopic member are respectively hinged to the supporting frame and the deviation correcting body, the second driving mechanism further comprises a sliding member, two ends of the second linkage rod are respectively hinged to the sliding member and the supporting frame, and the sliding member is slidably connected to the deviation correcting body.

6. The grapple rectifying device according to claim 5,

and the articulated shaft between the second telescopic component and the deviation rectifying body is the articulated shaft between the second linkage rod and the sliding piece.

7. The grapple rectifying device of claim 6,

the sliding piece moves between a first position and a second position relative to the deviation rectifying body;

8. Grab bucket for a trenching machine, characterized in that it comprises a grab bucket and a deviation rectifying device for a grab bucket according to any of claims 1 to 7.

9. The grab bucket of a trenching machine as claimed in claim 8, wherein the number of the grab bucket deviation correcting devices is two;

the two grab bucket deviation rectifying devices are respectively connected to two sides of the grab bucket.

10. A trenching machine comprising a grab as claimed in claim 8 or 9.