Log grapple with adjustable hinge point position, working device and excavator

Abstract

The utility model discloses a log grapple with the hinge point position adjustable, a working device and an excavator. The log grapple comprises a middle connecting part, a left grapple, a right grapple, two telescopic components and a synchronous connecting rod arranged in the middle connecting part. The middle connecting part is provided with a plurality of hinge points; the left claw and the right claw are hinged to the two sides of the middle connecting part respectively; the two telescopic components are respectively hinged between the middle connecting part and the left claw and between the middle connecting part and the right claw and are used for realizing opening and closing actions of the left claw and the right claw; the two ends of the synchronous connecting rod are hinged to the left grabber and the right grabber respectively, the length of the synchronous connecting rod can be adjusted, and when the log grabber is assembled, the closing positions of grabber tips of the left grabber and the right grabber are adjusted by adjusting the length of the synchronous connecting rod. The log grabber connecting rod adopts a variable hinge point structure, the length of the connecting rod is adjusted according to actual conditions during assembly, the left grabber and the right grabber are closed at correct positions, operation is convenient, and hinge point positioning is accurate.

Description

Technical Field

[0001] The utility model relates to a wood grabber with adjustable hinge point position, belonging to the technical field of engineering machinery excavators. Background Art

[0002] As an auxiliary working device of the excavator, the wood grabber takes advantage of the excavator's greater lifting force, higher loading height and sensitive operability. It relies on hydraulic drive to open and close the wood grabber to the left and right to achieve the work of grabbing, transporting and stacking wood. The use of the wood grabber has changed the previous situation of transporting and loading wood by manual labor, elevators or cranes. The work is flexible and changeable, and it is convenient, efficient and highly reliable in the process of wood transportation.

[0003] Existing wood grabbers have the following disadvantages:

[0004] 1. The clamping area and clamping capacity of the wood grabber in the prior art are small, which is inconsistent with the market demand for high efficiency.

[0005] 2. The left and right gripping tips of the wood grabber are mostly welded plate structures. When grabbing irregular wood, the stress and impact are large, which can easily damage the wood. Long-term operation can easily damage the drive cylinder components.

[0006] 3. In the prior art, the length of the connecting rod of the wood grab is fixed and cannot be adjusted. Due to the influence of parts processing, assembly accuracy and wear during long-term use, it is difficult to close the left and right grabs, and there is a large deviation between the position of the grab tip after closing and the theoretical design position, resulting in the wood grab failing to close in the correct position, affecting the overall force and grabbing efficiency of the wood grab. Summary of the invention

[0007] In view of the shortcomings of the prior art, the utility model provides a wood grabber with an adjustable hinge point position to achieve the work of grabbing, transporting and stacking wood. The wood grabber of the utility model replaces manual labor, improves work efficiency and the accuracy and safety of wood transport.

[0008] The utility model is implemented according to the following technical solutions:

[0009] In a first aspect, the utility model provides a wood grab with adjustable hinge position, comprising:

[0010] An intermediate connecting portion having a plurality of hinge points;

[0011] A left gripper and a right gripper are respectively hinged on two sides of the middle connecting part;

[0012] Two telescopic parts are respectively hinged between the middle connecting part and the left grip and the right grip, and are used to realize the opening and closing actions of the left grip and the right grip;

[0013] The synchronous connecting rod arranged in the middle connecting part has its two ends hinged to the left grip and the right grip respectively. The length of the synchronous connecting rod is adjustable. When assembling the wood grabber, the closing position of the left and right gripping tips is adjusted by adjusting the length of the synchronous connecting rod.

[0014] In some embodiments, the synchronization link comprises:

[0015] Two connecting sleeves arranged in parallel, one of which is hinged to the end of the left grip through a pin, and the other connecting sleeve is hinged to the end of the right grip through a pin;

[0016] The adjustable component is connected between the two connecting sleeves. On the one hand, it connects the two connecting sleeves together, and on the other hand, it adjusts the distance between the two connecting sleeves.

[0017] In some embodiments, the adjustable component comprises:

[0018] An outer connecting rod, one end of which is fixedly connected to the connecting sleeve I and the other end of which faces the connecting sleeve II;

[0019] An inner connecting rod, one end of which is fixedly connected to the connecting sleeve II and the other end of which faces the connecting sleeve I. The inner connecting rod and the outer connecting rod are assembled together through a stop structure;

[0020] The fastening component is used to fix the inner and outer connecting rods together after the positions are adjusted.

[0021] In some embodiments, the protrusion of the inner connecting rod is inserted into the groove of the outer connecting rod, and the two are clearance-matched, and the distance between the two connecting sleeves is adjusted by adjusting the insertion depth of the protrusion in the groove.

[0022] In some embodiments, the inner connecting rod is a protruding block II with an elongated circular hole at the position where it cooperates with the outer connecting rod, and the elongated circular hole is arranged from the top to the bottom of the protruding block II; the outer connecting rod is a protruding block I with a groove at the position where it cooperates with the inner connecting rod, and the groove is arranged from the left side to the right side of the protruding block I, the top plate at the groove is provided with at least one through hole I, and the bottom plate at the groove is provided with a through hole II or a threaded hole corresponding to the through hole I.

[0023] In some embodiments, when the bottom plate at the groove is provided with a threaded hole, the fastening component is a bolt, which is sequentially inserted into the through hole I, the elongated circle and the threaded hole, and by tightening the bolt, the upper plate and the lower plate at the groove clamp the protruding block II; when the bottom plate at the groove is provided with a through hole II, the fastening component is a bolt and a nut, which is sequentially inserted into the through hole I, the elongated circle and the through hole II and then fastened by the nut, and by tightening the bolt, the upper plate and the lower plate at the groove clamp the protruding block II.

[0024] In some embodiments, an anti-slip structure for increasing contact friction is provided between the contacting surfaces of the inner connecting rod and the outer connecting rod.

[0025] In some embodiments, the upper and lower inner surfaces of the outer connecting rod are processed with concave sawtooth patterns, and the upper and lower outer surfaces of the inner connecting rod are processed with opposite sawtooth projections.

[0026] In some embodiments, the inner connecting rod and the outer connecting rod are both circular rings at the parts connected to the connecting sleeve, and the circular rings are sleeved on the connecting sleeve, and the two are fixed by welding.

[0027] In some embodiments, the gripping tips of the left gripper and the right gripper are provided with a pulley structure for reducing the friction between the gripped object and the gripping object.

[0028] In some embodiments, the intermediate connection portion comprises:

[0029] A main box body is hinged with the left gripper and the right gripper through a pin shaft, and the synchronous connecting rod is arranged in the main box body;

[0030] An upper box body, on which a swing frame is mounted, and the swing frame is connected to the boom;

[0031] The slewing bearing and the slewing motor driving the slewing bearing to rotate are installed between the main housing and the upper housing, and the left gripper, the right gripper and the main housing can realize 360-degree rotation on the boom.

[0032] In some embodiments, at least one plate chain is hinged between the inner sides of the left gripper and the right gripper through a pin shaft, and during the process of grasping an object, the plate chain is used to compact and fix the grasped object.

[0033] In some embodiments, protective plates are installed on the inner sides of the left grip and the right grip.

[0034] In a second aspect, the utility model provides a working device, including a boom, on which the above-mentioned wood grabber with adjustable hinge position is installed.

[0035] In a third aspect, the utility model provides an excavator equipped with the above-mentioned wood grabber with adjustable hinge point position; or, equipped with the above-mentioned working device.

[0036] Beneficial effects of the utility model:

[0037] 1. This wood grabber has a large clamping area and a large one-time clamping capacity, which can greatly improve the transportation efficiency.

[0038] 2. The pulley structure is adopted at the left and right gripping tips of the wood grabber, which can significantly reduce the friction at the gripping tips, completely solve the problem of the gripping tips damaging the wood, and at the same time reduce the impact force on the hydraulic components during the grabbing process, so that the wood grabber is more stable in force and the service life of the mechanical and hydraulic structural parts is extended.

[0039] 3. The connecting rod of the wood grabber adopts a variable hinge point structure. During assembly, the length of the connecting rod can be adjusted according to actual conditions so that the left and right grabs can be closed in the correct position. The operation is convenient, the hinge point is accurately positioned, and the assembly efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0041] In the attached picture:

[0042] Figure 1 This is a schematic diagram of the overall structure of the wood grabber of the utility model;

[0043] Figure 2 This is a schematic diagram of the theoretical closed position of the wood grab;

[0044] Figure 3 It is a schematic diagram of the closed position of the wood grabber when the processing error exists;

[0045] Figure 4 It is a schematic diagram of assembling the synchronous connecting rod of the utility model;

[0046] Figure 5 It is a schematic diagram of the inner connecting rod slotting of the utility model.

[0047] Figure symbols: upper box body 1, slewing bearing 2, main box body 3, right grab 4, right protective plate 5, swing frame 6, slewing motor 7, cylinder 8, left grab 9, left protective plate 10, plate chain 11, pulley structure 12, synchronous connecting rod 13, connecting sleeve 131, outer connecting rod 132, bolt 133, inner connecting rod 134.

[0048] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0050] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] like Figure 1 As shown, a wood grab with adjustable hinge point position includes a middle connection part, a left grip 9, a right grip 4, two telescopic components and a synchronous connecting rod arranged in the middle connection part; the middle connection part has multiple hinge points; the left grip and the right grip are respectively hinged on both sides of the middle connection part; the two telescopic components are respectively hinged between the middle connection part and the left grip 9, the right grip 4, for realizing the opening and closing actions of the left and right grips 9, 4; the two ends of the synchronous connecting rod 13 are respectively hinged to the left grip 9, the right grip 4, the length of the synchronous connecting rod 13 is adjustable, and when assembling the wood grab, the closing position of the gripping tips of the left and right grips 9, 4 is adjusted by adjusting the length of the synchronous connecting rod 13.

[0053] The above-mentioned synchronous connecting rod is further explained below.

[0054] like Figure 4 As shown, the synchronous connecting rod 13 includes two parallel connected shaft sleeves 131 and an adjustable component; one of the connected shaft sleeves 131 is hinged to the end of the left grip 9 through a pin, and the other connected shaft sleeve 131 is hinged to the end of the right grip 4 through a pin; the adjustable component is connected between the two connected shaft sleeves 131, on the one hand, connecting the two connected shaft sleeves 131 together, on the other hand, adjusting the distance between the two connected shaft sleeves 131.

[0055] The above-mentioned adjustable components are further described below.

[0056] Continue to refer to Figure 4 As shown, the adjustable components include an outer connecting rod 132, an inner connecting rod 134 and a fastening component; one end of the outer connecting rod 132 is fixedly connected to the connecting sleeve I, and the other end faces the connecting sleeve II; one end of the inner connecting rod 134 is fixedly connected to the connecting sleeve II, and the other end faces the connecting sleeve I, and the inner connecting rod 134 and the outer connecting rod 132 are assembled together through a stop structure; the fastening component is used to fix the inner and outer connecting rods after position adjustment.

[0057] For further solutions, please refer to Figure 4 As shown, the protrusion of the inner connecting rod 134 is inserted into the groove of the outer connecting rod 132, and the two are clearance-matched. The distance between the two connecting sleeves 131 can be adjusted by adjusting the insertion depth of the protrusion in the groove.

[0058] For further solutions, please refer to Figure 4 As shown, the inner connecting rod 134 is a protruding block II with an elongated circular hole at the position cooperating with the outer connecting rod 132, and the elongated circular hole is arranged from the top to the bottom of the protruding block II; the outer connecting rod 132 is a protruding block I with a groove at the position cooperating with the inner connecting rod 134, and the groove is arranged from the left side to the right side of the protruding block I, the top plate at the groove is provided with at least one through hole I, and the bottom plate at the groove is provided with a through hole II or a threaded hole corresponding to the through hole I.

[0059] For further solutions, please refer to Figure 4 As shown, when the bottom plate at the groove is provided with a threaded hole, the fastening component is a bolt 133, and the bolt 133 is sequentially inserted into the through hole I, the elongated circle and the threaded hole, and by tightening the bolt 133, the upper plate and the lower plate at the groove clamp the protruding block II; when the bottom plate at the groove is provided with a through hole II, the fastening component is a bolt 133 and a nut, and the bolt 133 is sequentially inserted into the through hole I, the elongated circle and the through hole II and then fastened by the nut, and by tightening the bolt 133, the upper plate and the lower plate at the groove clamp the protruding block II.

[0060] For further solutions, please refer to Figure 4 As shown, an anti-slip structure for increasing contact friction is provided between the contacting surfaces of the inner connecting rod 134 and the outer connecting rod 132 .

[0061] Further solutions, such as Figure 5 As shown, the upper and lower inner surfaces of the outer connecting rod 132 are processed with concave sawtooth patterns, and the upper and lower outer surfaces of the inner connecting rod 134 are processed with opposite sawtooth projections. The material hardness of the outer connecting rod 132 should be lower than that of the inner connecting rod 134. When the bolts are tightened, the projections of the inner connecting rod 134 are embedded in the corresponding connection of the outer connecting rod 133 to achieve relative position fixation. This connection can achieve the transmission of a large bidirectional working force, and the connection is reliable.

[0062] For further solutions, please refer to Figure 4 As shown, the inner connecting rod 134 and the outer connecting rod 132 are both circular rings at the parts connected with the connecting sleeve 131. The circular rings are sleeved on the connecting sleeve 131 and the two are fixed by welding.

[0063] Continue to refer to Figure 1 As shown, the gripping tips of the left gripper 9 and the right gripper 4 are provided with a pulley structure 12 for reducing the friction between the gripped object and the gripped object. The use of the pulley structure 12 can significantly reduce the friction at the gripping tip, completely solving the problem of the gripping tip damaging the wood, while reducing the impact force on the hydraulic components during the gripping process, making the wood gripper more stable in force, and extending the service life of the mechanical and hydraulic structural parts.

[0064] The above-mentioned intermediate connecting portion is further described below.

[0065] Continue to refer to Figure 1 As shown, the middle connecting part includes a main box body 3, an upper box body 1, a slewing bearing 2 and a slewing motor 7 driving the rotation thereof; the main box body 3 is hinged with the left grip 9 and the right grip 4 through a pin shaft, and a synchronous connecting rod 13 is arranged in the main box body 3; a swing frame 6 is installed on the upper box body 1, and the swing frame 6 is connected to the boom; the slewing bearing 2 and the slewing motor 7 driving the rotation thereof are installed between the main box body 3 and the upper box body 1, and the left grip 9, the right grip 4 and the main box body 3 can realize a 360-degree rotation on the boom.

[0066] For further solutions, please refer to Figure 1 As shown, at least one plate chain 11 is hinged between the inner sides of the left gripper 9 and the right gripper 4 via a pin shaft. During the process of grabbing an object, the plate chain 11 is used to compact and fix the grasped object.

[0067] For further solutions, please refer to Figure 1 As shown, a left protective plate 10 is mounted on the inner side of the left grip 9, and a right protective plate 5 is mounted on the inner side of the right grip 4; at the same time, the clamping areas of the left grip 9 and the right grip 4 are increased, and the clamping capacity is large at one time, which can greatly improve the transfer efficiency.

[0068] When the log grapple is closed in the theoretical position Figure 2 Considering the machining accuracy of the machine tool, there are machining errors in the actual machining process of the wood grab parts (such as machining errors in one or more of the dimensions S1, S2, S3, S5, and S6), which results in the actual closed position of the wood grab after assembly (such as Figure 3 deviates from the theoretical closed position (as shown) Figure 2 At this time, if the connecting rod size S4 can be adjusted, the actual closing position of the wood grabber can be adjusted to be close to the theoretical closing position. This not only optimizes the grabbing efficiency and overall force of the wood grabber, but also further improves the overall aesthetics of the product.

[0069] During actual assembly, the assembly positions of the left and right grips are adjusted first, at which point the inner connecting rod 134 can slide freely in the outer connecting rod 132. When the assembly positions of the left and right grips are adjusted, the bolts 133 are tightened, and the outer connecting rod 132 and the inner connecting rod 134 are squeezed to complete the positioning connection.

[0070] The utility model is specifically implemented as follows Figure 1 As shown, the left gripper 9 and the right gripper 4 are connected to the main housing 3 through a pin, the main housing 3 and the upper housing 1 are connected through a slewing bearing 2, the upper housing 1 and the swing frame 6 are connected through a pin, the swing frame 6 is connected to the excavator boom, and the plate chain 11 is connected to the left gripper 9 and the right gripper 4 through a pin. When working, the left gripper 9 and the right gripper 4 are driven by the oil cylinder 8 to open and close. The left gripper 9, the right gripper 4 and the main housing 3 drive the slewing bearing 2 through the slewing motor 7 to achieve a 360-degree rotation. When grabbing wood, first fix the excavator in a suitable position, and through the opening and closing operations of the left and right grippers 9 and 4, the wood is grabbed and stacked, and the stacking angle and position are adjusted by rotating the main housing 3. In addition, during the process of grabbing wood, the flexible rotation between the chain plates of the plate chain 11 can ensure the contact area between the plate chain 11 and the wood, and the two plate chains 11 can be used to compact and fix the wood by their own weight, thereby improving the stability of the wood transportation process and effectively solving the problems of wood deviation and scattering. The right guard plate 5 and the left guard plate 10 are respectively fixed to the inner side of the left gripper 9 and the right gripper 4 by bolts, and can be replaced after wear and failure, thereby extending the service life of the left gripper 9 and the right gripper 4 of the wood grabber. During operation, the pulley is in rolling contact with the wood.

[0071] In summary, compared with the existing wood grabbers, the wood grabber provided by the utility model has the following advantages:

[0072] (1) The clamping area and clamping capacity of the wood grabber in the prior art are small, and the grabbing efficiency is low. The wood grabber of the utility model has a larger clamping area and a large one-time clamping capacity, which can greatly improve the transportation efficiency;

[0073] (2) The left and right gripping tips of the wood grabber are mostly plate welded structures, which have a large impact force when grabbing irregular wood, easily damaging the wood and the drive cylinder components, and reducing the working stability and service life of the wood grabber. The utility model adopts a pulley structure at the left and right gripping tips of the wood grabber, which can significantly reduce the friction at the gripping tips, completely solving the problem of the gripping tips damaging the wood, and at the same time reducing the impact force on the hydraulic components during the grabbing process, making the wood grabber more stable in force and extending the service life of the mechanical and hydraulic structural parts;

[0074] (3) In the prior art, the length of the connecting rod of the wood grabber is fixed and cannot be adjusted. Due to the influence of the processing and assembly accuracy of the parts and the wear during long-term use, it is difficult to assemble the left and right grabbers closed, and there is a large deviation between the position of the grab tip after closing and the theoretical design position, causing the wood grabber to fail to close in the correct position, affecting the overall force and grabbing efficiency of the wood grabber. The connecting rod of the wood grabber of the utility model adopts a variable hinge point structure. During assembly, the length of the connecting rod is adjusted according to the actual situation, so that the left and right grabbers are closed in the correct position, which is convenient to operate and the hinge point is accurately positioned.

[0075] The utility model also provides a working device, comprising a bucket rod, on which the above-mentioned wood grabber with adjustable hinge point position is installed.

[0076] The utility model also provides an excavator, which is equipped with the above-mentioned wood grabber with adjustable hinge point position; or is equipped with the above-mentioned working device.

[0077] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0078] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present utility model and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0079] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A wood grabber with adjustable hinge position, characterized in that: include: An intermediate connecting portion having a plurality of hinge points; A left gripper and a right gripper are respectively hinged on two sides of the middle connecting part; Two telescopic parts are respectively hinged between the middle connecting part and the left grip and the right grip, and are used to realize the opening and closing actions of the left grip and the right grip; The synchronous connecting rod arranged in the middle connecting part has its two ends hinged to the left grip and the right grip respectively. The length of the synchronous connecting rod is adjustable. When assembling the wood grabber, the closing position of the left and right gripping tips is adjusted by adjusting the length of the synchronous connecting rod.

2. A wood grab with adjustable hinge position according to claim 1, characterized in that: The synchronous connecting rod comprises: Two connecting sleeves arranged in parallel, one of which is hinged to the end of the left grip through a pin, and the other connecting sleeve is hinged to the end of the right grip through a pin; The adjustable component is connected between the two connecting sleeves. On the one hand, it connects the two connecting sleeves together, and on the other hand, it adjusts the distance between the two connecting sleeves.

3. A wood grab with adjustable hinge position according to claim 2, characterized in that: The adjustable components include: An outer connecting rod, one end of which is fixedly connected to the connecting sleeve I and the other end of which faces the connecting sleeve II; An inner connecting rod, one end of which is fixedly connected to the connecting sleeve II and the other end of which faces the connecting sleeve I. The inner connecting rod and the outer connecting rod are assembled together through a stop structure; The fastening component is used to fix the inner and outer connecting rods together after the positions are adjusted.

4. A wood grab with adjustable hinge position according to claim 3, characterized in that: The protrusion of the inner connecting rod is inserted into the groove of the outer connecting rod, and the two are clearance-matched. The distance between the two connecting sleeves can be adjusted by adjusting the insertion depth of the protrusion in the groove.

5. A wood grab with adjustable hinge position according to claim 4, characterized in that: The inner connecting rod has a protruding block II with an elongated circular hole at the position where it matches the outer connecting rod, and the elongated circular hole is arranged from the upper side to the lower side of the protruding block II; The outer connecting rod is provided with a protruding block I with a groove at the position matching with the inner connecting rod, and the groove is arranged from the left side to the right side of the protruding block I. The top plate at the groove is provided with at least one through hole I, and the bottom plate at the groove is provided with a through hole II or a threaded hole corresponding to the through hole I.

6. A wood grab with adjustable hinge position according to claim 5, characterized in that: When the bottom plate at the groove is provided with a threaded hole, the fastening member is a bolt, which is inserted into the through hole I, the elongated circular hole and the threaded hole in sequence, and by tightening the bolt, the upper plate and the lower plate at the groove clamp the protruding block II; When the bottom plate at the groove is provided with a through hole II, the fastening components are bolts and nuts, and the bolts are sequentially inserted into the through hole I, the elongated circle and the through hole II and then fastened by the nuts. By tightening the bolts, the upper plate and the lower plate at the groove clamp the protruding block II.

7. The wood grab with adjustable hinge position according to claim 3, characterized in that: An anti-slip structure for increasing contact friction is provided between the contacting surfaces of the inner connecting rod and the outer connecting rod.

8. A wood grab with adjustable hinge position according to claim 7, characterized in that: The upper and lower inner surfaces of the outer connecting rod are processed with concave sawtooth patterns, and the upper and lower outer surfaces of the inner connecting rod are processed with opposite sawtooth projections.

9. The wood grab with adjustable hinge position according to claim 3, characterized in that: The inner connecting rod and the outer connecting rod are both circular rings at the positions where they are connected to the connecting sleeve. The circular rings are sleeved on the connecting sleeve and the two are fixed by welding.

10. The wood grab with adjustable hinge position according to claim 1, characterized in that: The gripping tips of the left gripper and the right gripper are provided with pulley structures for reducing the friction between the gripped object and the gripping object.

11. A wood grab with adjustable hinge position according to claim 1, characterized in that: The intermediate connecting portion comprises: A main box body is hinged with the left gripper and the right gripper through a pin shaft, and the synchronous connecting rod is arranged in the main box body; An upper box body, on which a swing frame is mounted, and the swing frame is connected to the boom; The slewing bearing and the slewing motor driving the slewing bearing to rotate are installed between the main housing and the upper housing, and the left gripper, the right gripper and the main housing can realize 360-degree rotation on the boom.

12. The wood grab with adjustable hinge position according to claim 1, characterized in that: At least one plate chain is hinged between the inner sides of the left gripper and the right gripper through a pin shaft. During the process of grabbing an object, the plate chain is used to compact and fix the grasped object.

13. The wood grab with adjustable hinge position according to claim 1, characterized in that: The inner sides of the left grip and the right grip are both equipped with protective plates.

14. A working device, comprising a dipper arm, characterized in that: The dipper arm is equipped with a wood grabber with an adjustable hinge point position as described in any one of claims 1 to 13.

15. An excavator, characterized in that: A wood grabber with an adjustable hinge position as claimed in any one of claims 1 to 13; or a working device as claimed in claim 14.

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