Precise-positioning discharging device of grab ship unloader

By using positioning motors and hydraulic presses to drive the torsional lifting beams and telescopic beams in the grab ship unloader, the precise positioning of the grab ship assembly is solved, and the problem of grab ship unloader occupying a large amount of dock area and positioning difficulties in the existing technology is improved, and the work efficiency and positioning accuracy are improved.

CN119873645APending Publication Date: 2025-04-25ZHANJIANG ZHONGYUE ENERGY CO LTD
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Patent Information

Application Number
CN202510090146.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-21
Publication Date
2025-04-25

AI Technical Summary

Technical Problem

Existing grab ship unloaders need to lay guide rails on the ground, occupying a large amount of dock area, and if the wire rope is too long, it is easy to cause difficulty in positioning the grab.

Method used

A precisely positioned grab unloading machine unloading device is designed. By driving the rotational positioning angle of the torsional lift beam by the positioning motor, the hydraulic press drives the telescopic beam to extend or shorten, so that the grab assembly can reach any position in the plane area above the hull.

Benefits of technology

It saves the dock area, reduces the floor area of ​​the device, and improves the positioning accuracy and working efficiency of the grab.

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Abstract

The invention is applicable to the field of unloading devices, and provides a precisely-positioned unloading device of a grab ship unloader, which comprises a vertical frame, a base station assembly is arranged at the bottom end of the vertical frame, a bearing frame and a reinforcing frame are arranged at the top end of the vertical frame, and a torsion cantilever beam is rotationally arranged on the front side of each shaft seat. The end of the torsion cantilever beam is connected to an output shaft of the positioning motor, a telescopic joint is arranged at the end, back to the vertical frame, of the torsion cantilever beam, and a grab bucket mechanism is arranged below the end of the telescopic joint. And a reinforcing mechanism is arranged below the torsion cantilever beam. When the grab bucket is used, the positioning motor drives the torsion cantilever beam to rotate by a positioning angle, meanwhile, the hydraulic machine drives the telescopic beam to extend or retract relative to the torsion cantilever beam, and then the grab bucket assembly at the end of the telescopic beam can reach any position of a plane area above a ship body. Therefore, more wharf area can be saved for the locomotive to run, and the function of saving the occupied area is achieved.
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Description

Technical Field

[0001] The invention belongs to the field of unloading devices, and in particular relates to a precisely positioned unloading device of a grab ship unloader. Background Art

[0002] With the development of industrial technology, modern unloading device technology has become more and more perfect. Grabbing equipment is needed in the process of unloading the dock hull. The previous grab ship unloader was set up on the track. The grab ship unloader can move horizontally on the track to any position in the plane above the hull to pick up materials. However, this grab ship unloader needs to lay rails on the ground; Just like the palletizer with a walking positioning device published in Patent No. 201721223732.2, it includes a guide rail, a palletizer body arranged on the guide rail through rollers, and a palletizer positioning device arranged on the side of the palletizer body, and the positioning device includes a driving cylinder arranged at the bottom end of the side of the palletizer body and a positioning pin connected to the driving cylinder; the palletizer body of the utility model is arranged on the guide rail through rollers, and the palletizer body can move freely on the guide rail, so that one palletizer can be matched with multiple curing kilns to provide mold platforms for multiple curing kilns. At the same time, a positioning device is added to the palletizer body. When the palletizer body needs to stop, the positioning device can realize the precise positioning of the palletizer body, so that the mold platform can smoothly enter the curing kiln; The device also has defects when in use. The device needs to provide a walking track, so the installation range of the device is relatively large and the occupied site area is relatively large; In the past, the grab bucket of a grab ship unloader needed to be hoisted up by a wire rope. However, if the wire rope was too long, the grab bucket at the bottom of the wire rope would swing, which would easily make it difficult to position the grab bucket. Summary of the invention

[0003] The purpose of the present invention is to provide a precise positioning grab ship unloader unloading device to address the deficiencies of the prior art. When the device is in use, the positioning motor drives the torsion beam to rotate the positioning angle, and at the same time the hydraulic press drives the telescopic beam to extend or shorten relative to the torsion beam, so that the grab assembly at the end of the telescopic beam can reach any position in the plane area above the hull. Compared with the grab ship unloaders of the prior art, the previous grab ship unloaders need to set up tracks on the ground, and the bottom tracks need to occupy a lot of dock area. The frame of the present invention will occupy very little area, which can save more dock area for locomotive driving, thereby solving the problems mentioned in the background technology.

[0004] In order to solve the above problems, the present invention provides the following technical solutions: a precisely positioned grab ship unloader unloading device, comprising a vertical frame, a base assembly is arranged at the bottom end of the vertical frame, a load-bearing frame and a reinforcement frame are arranged at the top end of the vertical frame, and the load-bearing frame is located above the reinforcement frame; two axle seats are arranged on the side walls of the load-bearing frame, and a torsion beam is rotatably arranged on the front sides of the axle seats, and the end of the torsion beam is connected to the output shaft of the positioning motor, and a telescopic joint is arranged at the end of the torsion beam facing away from the vertical frame, and a grab mechanism is arranged below the end of the telescopic joint; a reinforcement mechanism is arranged below the torsion beam.

[0005] Furthermore, the base assembly includes a base at the bottom of the frame, and the frame is detachably connected to the base via expansion screws.

[0006] Furthermore, the reinforcement mechanism includes two curved blocks on the front side wall of the reinforcement frame, the axis centers of the two curved blocks and the axis centers of the two axle seats correspond to each other in the vertical direction, a torsion vertical rod is provided at the bottom of the torsion cantilever beam, a rotating wheel is rotatably provided at the bottom of the torsion vertical rod, and the two rotating wheels are respectively attached to the side walls of the curved blocks.

[0007] Furthermore, a supporting diagonal rod is provided on the side wall of the torsion vertical rod, the top end of the supporting diagonal rod is fixedly connected to the bottom surface of the torsion cantilever beam, and the supporting diagonal rod and the torsion vertical rod form an angle of forty-five degrees.

[0008] Furthermore, the telescopic joint includes a telescopic cantilever beam, a sliding channel matching the cross-section of the telescopic cantilever beam is arranged inside the torsion cantilever beam, a translation frame is arranged at the end of the telescopic cantilever beam facing away from the torsion cantilever beam, the side walls of the top surface of the translation frame are respectively rotatably connected to the end of the telescopic cantilever beam, and lifting components connected to the grab mechanism are arranged at both ends of the translation frame, and the telescopic rod of the hydraulic press is connected to the top surface of the telescopic cantilever beam.

[0009] Furthermore, the lifting assembly includes lifting motors at both ends of the bottom surface of the translation frame, and a winding roller is arranged on the output shaft of the lifting motor. The outer side of the winding roller pulls out the lifting rope, and the grab mechanism is connected to the bottom ends of the two lifting ropes.

[0010] Furthermore, the grab bucket mechanism includes a shoveling frame, both ends of the shoveling frame are provided with a forked frame, and two shoveling shoes are rotatably provided in the middle of the forked frame, and the two shoveling shoes are respectively connected to the torsion shaft of the digging motor.

[0011] Furthermore, the torsion amplitude of the digging motor is one hundred and eighty degrees, and the torsion amplitude limit of the digging motor is the opening facing upward or the opening facing downward.

[0012] Compared with the prior art, the embodiments of the present application have the following beneficial effects: Firstly, when the device is in use, the positioning motor drives the torsion beam to rotate to a positioning angle, and at the same time the hydraulic press drives the telescopic beam to extend or shorten relative to the torsion beam, so that the grab assembly at the end of the telescopic beam can reach any position in the plane area above the hull. Compared with the grab ship unloader in the prior art, the previous grab ship unloader needs to set up tracks on the ground, and the bottom track needs to occupy a lot of dock area. The frame of the present invention will occupy very little area, which can save more dock area for locomotive driving.

[0013] Secondly, during the rotation and positioning process of the torsion cantilever beam, the torsion upright at the bottom of the torsion cantilever beam will also rotate along with it, and the rotating wheel at the bottom of the torsion upright will always be in contact with the surface of the curved block, thereby increasing the supporting strength of the torsion cantilever beam.

[0014] Thirdly, the lifting motor drives the shovel frame to rise and fall through the lifting rope to dig materials. The two steel ropes can reduce the swing of the shovel frame and the shovel shoe, and then during the rotation of the twisted cantilever beam, the steel rope and the shovel frame at its bottom can quickly stabilize, thereby increasing the positioning efficiency of the bucket. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the front view of the present invention.

[0016] Figure 2 It is a schematic diagram of the shovel frame of the present invention.

[0017] Figure 3 It is a schematic diagram of a second viewing angle of the present invention.

[0018] Figure 4 Schematic diagram of the curved surface block of the present invention.

[0019] Figure 5 It is a schematic diagram of the third viewing angle of the present invention.

[0020] Figure 6 It is a schematic diagram of the supporting diagonal rod of the present invention.

[0021] Description of reference numerals: Vertical frame 1, base 2, load-bearing frame 3, reinforcement frame 4, curved block 401, torsion cantilever beam 5, telescopic cantilever beam 501, supporting diagonal rod 502, torsion vertical rod 503, rotating wheel 504, hydraulic press 505, shoveling frame 6, shoveling tile 601, digging motor 602, translation frame 7, lifting motor 701, winding rod 702, pulling rope 703, axle seat 8, positioning motor 801. DETAILED DESCRIPTION

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] The present invention provides a precise positioning grab ship unloader unloading device, such as Figure 1-6 As shown, it includes a stand 1, a base assembly is provided at the bottom end of the stand 1, a load-bearing frame 3 and a reinforcement frame 4 are provided at the top end of the stand 1, and the load-bearing frame 3 is located above the reinforcement frame 4; two axle seats 8 are provided on the side walls of the load-bearing frame 3, and a torsion beam 5 is rotatably provided on the front sides of the axle seats 8, and the end of the torsion beam 5 is connected to the output shaft of the positioning motor 801, and a telescopic joint is provided at the end of the torsion beam 5 facing away from the stand 1, and a grab mechanism is provided below the end of the telescopic joint; a reinforcement mechanism is provided below the torsion beam 5.

[0025] In this embodiment, the positioning motor 801 drives the torsion beam 5 to rotate the positioning angle, and at the same time the telescopic joint is extended or shortened relative to the torsion beam 5, so that the grab assembly at the end of the telescopic joint can reach any position of the plane area above the hull. Compared with the grab ship unloader in the prior art, the previous grab ship unloader needs to set up tracks on the ground, and the bottom track needs to occupy a lot of dock area. The area of ​​the bottom track can be used for vehicles to pass. Vehicles need to take detours back and forth at the dock, which reduces the unloading efficiency. The frame 1 of the present invention will occupy a very small area, which can save more dock area for locomotives to travel, and the loaded vehicles can directly travel under the device to reach the unloading position.

[0026] In a further embodiment of the present invention, Figure 1-5 As shown, the base assembly includes a base 2 at the bottom of a stand 1, and the stand 1 is detachably connected to the base 2 via expansion screws.

[0027] In this embodiment, the stand 1 can be disassembled from the base 2, and then the device can be transported to other locations for reassembly.

[0028] In a further embodiment of the present invention, Figure 1-6 As shown, the reinforcing mechanism includes two curved blocks 401 on the front side wall of the reinforcing frame 4, the axis centers of the two curved blocks 401 and the axis centers of the two axle seats 8 correspond to each other in the vertical direction, a torsion vertical rod 503 is provided at the bottom of the torsion cantilever beam 5, a rotating wheel 504 is rotatably provided at the bottom of the torsion vertical rod 503, and the two rotating wheels 504 are respectively attached to the side walls of the curved blocks 401.

[0029] In this embodiment, during the process of rotation and positioning of the torsion beam 5, the torsion upright 503 at the bottom of the torsion beam 5 will also rotate together, and the rotating wheel 504 at the bottom of the torsion upright 503 is always in contact with the surface of the curved block 401, thereby increasing the supporting strength of the torsion beam. Compared with the beam device in the prior art, the previous beams are easily damaged or even broken when lifting heavy goods. The torsion upright 503 of the present invention can be replaced with different lengths. If the torsion beam 5 needs to carry heavier goods, a torsion upright 503 with a longer length can be replaced.

[0030] In a further embodiment of the present invention, Figure 1-6 As shown, a supporting diagonal rod 502 is provided on the side wall of the torsion vertical rod 503, and the top end of the supporting diagonal rod 502 is fixedly connected to the bottom surface of the torsion cantilever beam 5, and the supporting diagonal rod 502 and the torsion vertical rod 503 form an angle of forty-five degrees.

[0031] In this embodiment, the supporting diagonal rod 502 increases the load-bearing strength of the torsion cantilever beam 5, and the torsion pressure of the torsion cantilever beam 5 is transmitted to the torsion vertical rod 50 and the rotating wheel 504 at its bottom end.

[0032] In a further embodiment of the present invention, Figure 1-6 As shown, the telescopic section includes a telescopic cantilever beam 501, the interior of the torsion cantilever beam 5 is provided with a sliding channel matching the cross-section of the telescopic cantilever beam 501, the end of the telescopic cantilever beam 501 facing away from the torsion cantilever beam 5 is provided with a translation frame 7, the side walls of the top surface of the translation frame 7 are respectively rotatably connected to the ends of the telescopic cantilever beam 501, and lifting components connected to a grab mechanism are provided at both ends of the translation frame 7, and the torsion cantilever beam 5 is provided with a hydraulic press 505, and the telescopic rod of the hydraulic press 505 is connected to the top surface of the telescopic cantilever beam 501.

[0033] In this embodiment, the hydraulic press 505 drives the telescopic beam 501 to extend or shorten relative to the torsion beam 5, so that the grab assembly at the end of the telescopic beam 501 can reach any position in the plane area above the hull. The two sets of torsion beams 5 and the telescopic beam 501 can remain parallel during the torsion process, so that the grab assembly at the end of the telescopic beam 501 can avoid angular twisting during movement, thereby increasing the angular stability of the grab assembly.

[0034] In a further embodiment of the present invention, Figure 1-2 As shown, the lifting assembly includes a lifting motor 701 at both ends of the bottom surface of the translation frame 7, and a winding roller 702 is provided on the output shaft of the lifting motor 701. The outer side of the winding roller 702 pulls out a lifting rope 703, and the grab mechanism is connected to the bottom ends of the two lifting ropes 703.

[0035] In this embodiment, the lifting motor 701 drives the bucket assembly to rise and fall through the lifting rope 703 to dig materials. The two lifting ropes 703 can reduce the swing of the bucket assembly, and then the lifting rope 703 and the bucket assembly at the bottom of the twisted beam 5 can quickly stabilize during the rotation process, thereby increasing the positioning efficiency of the bucket assembly. Compared with the bucket hoisted by wire rope in the prior art, it takes a long time for the too long wire rope to stabilize during the activity, which takes a long time to position the bucket, reducing work efficiency.

[0036] In a further embodiment of the present invention, Figure 1-2 As shown, the grab mechanism includes a shoveling frame 6, both ends of which are provided with a forked frame, and two shoveling tiles 601 are rotatably provided in the middle of the forked frame, and the two shoveling tiles 601 are respectively connected to the torsion shaft of the digging motor 602.

[0037] In this embodiment, the digging motor 602 drives the digging shoe 601 to rotate back and forth to dig materials in the cabin.

[0038] In a further embodiment of the present invention, Figure 1-2 As shown, the torsion amplitude of the digging motor 602 is one hundred and eighty degrees, and the torsion amplitude limit of the digging motor 602 is the opening facing upward or the opening facing downward.

[0039] In this embodiment, the digging motor 602 drives the shovel shoe 601 to rotate until the opening is completely facing downward, and the debris hanging on the inner wall of the shovel shoe 601 will fall off more easily. Compared with the grab ship unloader in the prior art, the previous grab ship unloader cannot be twisted to a state where the opening is completely facing downward, which makes it easy for debris to hang on the inner wall of the shovel shoe 601. The debris hanging on the wall of the shovel shoe 601 affects the capacity of the shovel shoe 601.

[0040] Working principle: the positioning motor 801 drives the torsion beam 5 to rotate the positioning angle, and at the same time the telescopic joint is extended or shortened relative to the torsion beam 5, so that the grab assembly at the end of the telescopic joint can reach any position of the plane area above the hull. Compared with the grab ship unloader in the prior art, the previous grab ship unloader needs to set up tracks on the ground, and the bottom track needs to occupy a lot of dock area. The area of ​​the bottom track can be used for vehicles to pass. Vehicles need to take detours back and forth at the dock, which reduces the unloading efficiency. The frame 1 of the present invention will occupy a very small area, which can save more dock area for locomotives to travel, and the loaded vehicles can directly travel under the device to reach the unloading position.

[0041] In a further embodiment of the present invention, Figure 1-5 As shown, the base assembly includes a base 2 at the bottom of a stand 1, and the stand 1 is detachably connected to the base 2 via expansion screws.

[0042] In this embodiment, the frame 1 can be disassembled from the base 2, and then the device can be transported to other locations for reassembly. During the rotation and positioning of the torsion beam 5, the torsion upright 503 at the bottom of the torsion beam 5 will also rotate together, and the rotating wheel 504 at the bottom of the torsion upright 503 is always in contact with the surface of the curved block 401, thereby increasing the supporting strength of the torsion beam. Compared with the beam device of the prior art, the beam is easily damaged or even broken when lifting heavy goods. The rotating upright 503 can be replaced with different lengths. If the torsion beam 5 needs to carry heavier cargo, the torsion upright 503 with a longer length is replaced. The supporting diagonal rod 502 increases the load-bearing strength of the torsion beam 5. The torsional pressure of the torsion beam 5 is transmitted to the torsion upright 50 and the rotating wheel 504 at its bottom. The hydraulic press 505 drives the telescopic beam 501 to extend or shorten relative to the torsion beam 5, so that the grab assembly at the end of the telescopic beam 501 can reach any position in the plane area above the hull. The two sets of torsion beams 5 and the telescopic beam 501 can be kept in the torsion process. The lifting rope 703 is used to lift the bucket assembly to the left and right sides of the telescopic beam 501, and the lifting rope 703 is used to lift the bucket assembly to the left and right sides of the telescopic beam 501. It takes a long time to position the bucket, which reduces work efficiency. The digging motor 602 drives the shovel shoe 601 to twist back and forth to dig materials in the cabin. The digging motor 602 drives the shovel shoe 601 to rotate until the opening is completely facing downward, and the debris hanging on the inner wall of the shovel shoe 601 will fall off more easily. Compared with the grab ship unloader in the prior art, the previous grab ship unloader cannot be twisted to a state where the opening is completely facing downward, which makes it easy for debris to hang on the inner wall of the shovel shoe 601, and the debris hanging on the wall of the shovel shoe 601 affects the capacity of the shovel shoe 601.

[0043] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0044] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of the above-mentioned units. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

[0045] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A precise positioning grab ship unloader unloading device, characterized in that: It comprises a stand (1), wherein a base assembly is arranged at the bottom end of the stand (1), and a load-bearing frame (3) and a reinforcing frame (4) are arranged at the top end of the stand (1), wherein the load-bearing frame (3) is located above the reinforcing frame (4); Two axle seats (8) are arranged on the side walls of the load-bearing frame (3), and a torsion beam (5) is rotatably arranged on the front side of each axle seat (8), and the end of the torsion beam (5) is connected to the output shaft of the positioning motor (801), and a telescopic joint is arranged at one end of the torsion beam (5) facing away from the vertical frame (1), and a grab mechanism is arranged below the end of the telescopic joint; A reinforcement mechanism is provided below the torsion cantilever beam (5).

2. The precise positioning grab ship unloader unloading device according to claim 1 is characterized by: The base assembly comprises a base (2) at the bottom of a stand (1); the stand (1) is detachably connected to the base (2) via expansion screws.

3. The precise positioning grab ship unloader unloading device according to claim 1 is characterized by: The reinforcing mechanism comprises two curved blocks (401) on the front side wall of the reinforcing frame (4); the axis centers of the two curved blocks (401) and the axis centers of the two axle seats (8) correspond to each other in the vertical direction; a torsion vertical rod (503) is arranged at the bottom of the torsion cantilever beam (5); a rotating wheel (504) is rotatably arranged at the bottom of the torsion vertical rod (503); and the two rotating wheels (504) are respectively attached to the side walls of the curved blocks (401).

4. The precise positioning grab ship unloader unloading device according to claim 3 is characterized by: A supporting diagonal rod (502) is provided on the side wall of the torsion vertical rod (503); the top end of the supporting diagonal rod (502) is fixedly connected to the bottom surface of the torsion cantilever beam (5); and the supporting diagonal rod (502) and the torsion vertical rod (503) form an angle of 45 degrees.

5. The precise positioning grab ship unloader unloading device according to claim 1, characterized in that: The telescopic section comprises a telescopic beam (501), a sliding channel matching the cross section of the telescopic beam (501) is arranged inside the torsion beam (5), a translation frame (7) is arranged at the end of the telescopic beam (501) facing away from the torsion beam (5), the side walls of the top surface of the translation frame (7) are respectively rotatably connected to the end of the telescopic beam (501), lifting components connected to a grab mechanism are arranged at both ends of the translation frame (7), and the torsion beam (5) is provided with a hydraulic press (505), and the telescopic rod of the hydraulic press (505) is connected to the top surface of the telescopic beam (501).

6. The precise positioning grab ship unloader unloading device according to claim 5, characterized in that: The lifting assembly comprises a lifting motor (701) at both ends of the bottom surface of the translation frame (7), a winding roller (702) is arranged on the output shaft of the lifting motor (701), a lifting rope (703) is pulled out from the outer side of the winding roller (702), and a grab mechanism is connected to the bottom ends of the two lifting ropes (703).

7. The precise positioning grab ship unloader unloading device according to claim 1, characterized in that: The grab mechanism comprises a shoveling frame (6), both ends of which are provided with forked frames, and two shoveling tiles (601) are rotatably provided in the middle of the forked frame, and the two shoveling tiles (601) are respectively connected to the torsion shaft of the digging motor (602).

8. The precise positioning grab ship unloader unloading device according to claim 7, characterized in that: The torsion amplitude of the digging motor (602) is one hundred and eighty degrees, and the torsion amplitude limit of the digging motor (602) is the opening facing upward or the opening facing downward.

Citation Information

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