A grab for hoisting by a crane with high balance degree and a method for using the same

Abstract

The application discloses a grab bucket with high balance degree for crane hanging and a use method thereof, and belongs to the technical field of grab buckets of cranes. The grab bucket with high balance degree for crane hanging comprises a hydraulic grab bucket, the hydraulic grab bucket comprises a connecting beam connected with a steel wire rope, two bucket bodies connected through a hinge shaft, and a hydraulic oil cylinder for driving the two bucket bodies to open and close, and a pressure drainage mechanism is arranged in the hydraulic grab bucket, the pressure drainage mechanism comprises a water pressing assembly for pressing sludge and a drainage assembly for discharging water bodies; wherein the water pressing assembly comprises a screw pipe fixedly arranged on the connecting beam through a connecting plate, a screw rod in threaded connection with the screw pipe, and a pressure drainage piece movably arranged on the lower side of the screw rod; the drainage assembly and the water pressing assembly are integrated, so that subsequent operation steps are reduced, the discharging time of the excess water bodies in the mud tank of the dredger is shortened, and the overall dredging efficiency of the dredger is improved.

Description

Technical Field

[0001] This invention relates to the field of crane grab technology, and in particular to a crane lifting grab with high balance and its method of use. Background Technology

[0002] A hydraulic grab bucket is a grab bucket powered by a hydraulic system. Its hydraulic drive unit is integrated into the upper part of the grab bucket, and the opening and closing of the grab bucket is controlled by the extension and retraction of hydraulic cylinders. Compared to common mechanical grab buckets that are pulled by steel cables, hydraulic grab buckets are more efficient and powerful, and can be used for high-efficiency work in harsh environments. Common hydraulic grab buckets are suspended by steel cables and lowered to the working position to grab materials.

[0003] Hydraulic grab bucket opening and closing mechanisms often employ a symmetrical four-bar linkage, controlling the opening and closing of the grab bucket through the extension and retraction of the hydraulic cylinders. In actual operation, the two buckets often open at different degrees, causing the bucket to tilt, resulting in grab failure and the sludge falling out. At the same time, the grab bucket scoops up river water along with the sludge and puts it into the dredger, requiring the dredger to subsequently discharge the excess water. This operation is cumbersome, time-consuming, and does not improve construction efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a crane lifting grab bucket with high balance and its usage method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A crane lifting grab with high balance includes a hydraulic grab connected to the lifting equipment. The hydraulic grab includes a connecting beam connected to a wire rope, two buckets connected by a hinge shaft, and a hydraulic cylinder for driving the two buckets to open and close. The hydraulic grab bucket is equipped with a water pressure and drainage mechanism, which includes a water pressure component for squeezing sludge and a water drainage component for discharging water. The water pressure assembly includes: The spiral tube is fixedly mounted on the connecting beam via a connecting plate; The screw is threadedly connected to the solenoid. The pressure plate component is movably located on the lower side of the screw; The drive unit is disposed on the pressure plate and is connected to the screw drive.

[0006] Preferably, a synchronous connecting rod is provided between the two buckets to force the two buckets to close synchronously; One end of the synchronous connecting rod is coaxially rotatably connected to the hinge of one of the buckets and the hydraulic cylinder, and the other end is movably connected to another bucket via a pin.

[0007] Preferably, the driving unit includes: a support fixedly mounted on the pressure plate; a drive motor mounted on the support; a rotating rod coaxially connected to the output shaft of the drive motor; a main bevel gear fixedly mounted on the end of the rotating rod; and a secondary bevel gear mounted on the screw and meshing with the main bevel gear.

[0008] Preferably, the pressing component includes: a lifting plate connected to the screw and the support; an elastic telescopic rod vertically disposed at the bottom of the lifting plate; and a flexible metal pressure plate connected to the lifting plate via the elastic telescopic rod. The flexible metal pressure plate moves against the inner wall of the hopper, and the top wall of the flexible metal pressure plate has a guide surface inclined to one side.

[0009] Preferably, it further includes: a recessed hole formed on the upper surface of the flexible metal pressure plate; and a water collection tank disposed at the top of the recessed hole and communicating with the recessed hole.

[0010] Preferably, the rotating rod includes: a first shaft body, keyed to the output shaft of the drive motor; a second shaft body, fixedly connected to the main bevel gear; an eccentric shaft, connecting the first shaft body and the second shaft body; and further includes: a first swing member, sleeved on the outer wall of the eccentric shaft, and connected to the flexible metal pressure plate via a connecting rod.

[0011] Preferably, the drainage assembly includes: a drainage cylinder fixedly mounted on the lifting plate; a piston body slidably mounted in the inner cavity of the drainage cylinder; and a second swing member connecting the piston body and the eccentric shaft; wherein the drainage cylinder is provided with an inlet valve and an outlet valve, the drainage cylinder is connected to a drainage pipe through the outlet valve, and the drainage cylinder is connected to an inlet assembly through the inlet valve.

[0012] Preferably, the liquid inlet assembly includes: a liquid inlet hose, one end of which is connected to a liquid inlet valve, and the other end of which is connected to a movable pipe placed in a water collection tank; an abutment plate, disposed on the lower side of the movable pipe, for contacting the sludge in the water collection tank; a float, fixed on the upper side of the abutment plate, which drives the abutment plate to move upward under the action of buoyancy; a liquid inlet cone-shaped port, opened on the lower side of the abutment plate and connected to the movable pipe; and an air groove, inclined upward on the abutment plate and connected to the liquid inlet cone-shaped port. A guide rod is slidably connected between the movable pipe and the water collection tank.

[0013] Preferably, the lifting equipment includes a hydraulic winch, which suspends a hydraulic grab bucket via a wire rope, and the hydraulic winch is mounted on the hull via a support base.

[0014] This invention also discloses a method for using a crane lifting grab bucket with high balance, comprising the following steps: S1: Start the hydraulic winch and lower the hydraulic grab bucket to the designated dredging position via the wire rope; S2: Control the operation of the hydraulic cylinder to stretch the piston rod of the hydraulic cylinder. The two buckets rotate around the hinge position with the connecting beam as the axis. The two buckets separate and continue to be lowered with the wire rope. The silt is placed on the upper side of the two buckets. The hydraulic cylinder retracts its piston rod, causing the two buckets to approach and close, thus completing the grabbing of silt. S3: Lift the hydraulic grab bucket off the water surface using a steel wire rope; S4: Start the drive motor. The output shaft of the drive motor drives the main bevel gear to mesh with the secondary bevel gear on the screw through the rotating rod. The screw rotates and moves downward relative to the solenoid. The screw drives the pressing component to move downwards, and the pressing component presses down the silt it grabs through the flexible metal pressure plate at the bottom, squeezing the water in the silt into the water collection tank. The eccentric shaft drives the flexible metal pressure plate to move up and down reciprocally through the first swinging component, which breaks the colloidal structure of the sludge and enhances the solid-liquid separation efficiency. The eccentric shaft simultaneously drives the piston body to reciprocate within the drain cylinder via the second swing component. The drain cylinder draws water from the water collection tank and discharges it to the outside of the hydraulic grab bucket through the drain pipe. S5: After the drainage work is completed, transfer the hydraulic grab bucket to the designated position, control the hydraulic cylinder to separate the two buckets, and let the sludge fall under its own gravity. S6: The drive motor continues to control the screw to rotate, and the flexible metal pressure plate moves down between the two buckets to scrape off the silt in the buckets that is not easy to slide down due to the reduced water content. S7: Controls the output shaft of the drive motor to rotate in the opposite direction, and the screw drives the flexible metal pressure plate to reset for subsequent pressure drainage.

[0015] Compared with the prior art, the present invention provides a crane lifting grab bucket with high balance and its method of use, which has the following beneficial effects: 1. The crane grab bucket with high balance and its usage method reduce subsequent operation steps by integrating drainage and water pressure mechanisms, shorten the discharge time of excess water in the mud tank of the dredger, and thus improve the overall dredging efficiency of the dredger.

[0016] 2. This highly balanced crane grab bucket and its usage method involve setting a synchronous connecting rod at one end of the drive cylinder and a point on the other side of the passive bucket. The left end of the synchronous connecting rod rotates together with the drive cylinder around the left hinge point of the grab bucket, while the right end of the synchronous connecting rod is connected to the right side of the bucket and rotates around the right hinge point. When the load on the left side is greater than that on the right side, the synchronous connecting rod is compressed, transmitting the power from the right side to the left side to provide supplementary torque. When the load on the left side is less than that on the right side, the synchronous connecting rod is stretched, transmitting the power from the left side to the right side to provide supplementary torque. This balances the resistance on both sides within a certain range, increasing the reliability of the grab bucket's gripping action, greatly improving its efficiency, and preventing bucket deformation and damage caused by uneven force distribution.

[0017] 3. The crane grab bucket with high balance and its usage method, when the rotating rod rotates, the eccentric shaft drives the flexible metal pressure plate to move up and down reciprocally through the first swinging component. The mechanical vibration breaks down the colloidal structure of the sludge, making it easier to squeeze out the bound water wrapped inside the floc, accelerating the rearrangement of sludge particles of different sizes, and enhancing the solid-liquid separation efficiency. Moreover, when the flexible metal pressure plate moves down to scrape off the sludge that is not easy to fall off the inner wall of the bucket, it is still in a shaking state, so that the sludge adhering to the bottom side of the flexible metal pressure plate is shaken off, increasing the amount of sludge that the hydraulic grab bucket can grab and release in a single operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the hydraulic grab bucket of the present invention; Figure 2 This is a schematic diagram of the structure of the hydraulic grab bucket of the present invention when equipped with a synchronous connecting rod; Figure 3 This is a schematic diagram of the hydraulic grab bucket of the present invention without a synchronizing link; Figure 4 for Figure 2 Simplified structural diagram; Figure 5 This is a schematic diagram of the force distribution on the synchronous link of the present invention; Figure 6 This is a schematic diagram of the working structure of the pressure drainage mechanism of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram of section A in the middle; Figure 8 For the present invention Figure 6 Enlarged structural diagram of section B; Figure 9 This is a schematic diagram of the structure of the flexible metal pressure plate of the present invention; Figure 10 This is a schematic diagram of the drive unit of the present invention; Figure 11 This is a cross-sectional structural diagram of the drainage cylinder of the present invention; Figure 12 This is a schematic diagram of the overall structure of the present invention.

[0019] In the diagram: 1. Hull; 2. Support base; 3. Hydraulic winch; 4. Hydraulic grab; 401. Connecting beam; 402. Hinge shaft; 403. Bucket body; 404. Hydraulic cylinder; 405. Synchronous connecting rod; 5. Screw; 501. Screw; 502. Pressure plate; 5021. Lifting plate; 5022. Elastic telescopic rod; 5023. Flexible metal pressure plate; 6. Support; 601. Drive motor; 602. Rotating rod; 6021. First Shaft body; 6022, Second shaft body; 6023, Eccentric shaft; 603, Main bevel gear; 604, Secondary bevel gear; 7, Concave hole; 701, Water collection tank; 8, First swinging component; 9, Drain cylinder; 901, Piston body; 902, Second swinging component; 10, Drain pipe; 11, Liquid inlet hose; 111, Moving pipe; 112, Abutment plate; 1121, Liquid inlet conical port; 1122, Air groove; 113, Float; 12, Guide rod. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 9 and Figure 12 As shown, this embodiment proposes a crane lifting grab with high balance, belonging to the field of crane grab technology. It includes a hydraulic grab 4 connected to a lifting device, which includes a hydraulic winch 3. The hydraulic winch 3 suspends the hydraulic grab 4 through a steel wire rope and is mounted on the hull 1 through a support seat 2. The hydraulic grab 4 has a symmetrical double-bucket structure and realizes the opening and closing action through a hinge shaft 402. It integrates a pressure and drainage mechanism inside, which can simultaneously complete solid-liquid separation and water discharge when grabbing silt. The water-pressing assembly includes a helical tube 5 fixed to the connecting plate of the connecting beam 401, vertically welded to the connecting plate of the connecting beam 401, with trapezoidal threads machined on the inner wall and a thread helix angle designed to be 10°-15° to ensure self-locking; the screw 501 is threadedly engaged with the helical tube 5, and the bottom is connected to the pressing component 502 through a ball joint, allowing for slight sway; the pressing component 502 includes a lifting plate 5021, multiple sets of evenly distributed elastic telescopic rods 5022, and a nickel-titanium alloy flexible metal pressure plate 5023; the drive unit drives the screw 501 to rotate and move downward, pushing the pressing component 502 to squeeze the sludge at a speed of 5-8mm / s. A pressure sensor should be installed to monitor in real time and provide feedback to the PLC control system; during the return phase, the drive unit reverses and lifts the screw 501, and the elastic telescopic rods 5022 reset, causing the pressing component 502 to move upward; through the mechanical gain generated by the threaded transmission, the motor torque is converted into high-pressure extrusion force, which significantly reduces the water content of the sludge; By integrating drainage and pressure mechanisms, subsequent operational steps are reduced, shortening the time for discharging excess water from the dredger's mud chamber and thus improving the overall dredging efficiency of the dredger.

[0023] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in a preferred embodiment, based on the above method, a fixed-length synchronous connecting rod 405 is further provided between one end of the hydraulic cylinder 404 and a point on the other side of the passive bucket 403. This rod transmits unbalanced force, forcing the two buckets to maintain symmetrical posture, which can balance the resistance on both sides within a certain range, ensuring the correct grabbing posture and achieving effective grabbing. After adding the synchronous connecting rod 405, the active end and passive end of the two buckets 403 are connected, balancing the resistance on both sides during the grabbing process, forcing the two buckets to be in the correct position at all times, and ensuring the smooth opening and closing of the buckets. After designing the synchronous connecting rod 405 according to the maximum possible unbalanced force, it can be ensured that the opening and closing posture of the grab bucket is always correct. Grab mechanism such as Figures 2-5 The system employs a symmetrical four-bar linkage mechanism. BC is a hydraulic cylinder 404, T1 and T2 are the tips of the bucket teeth, triangle BAT1 is the left grab bucket, and triangle CDT2 is the right grab bucket. Points A and D are the hinge points between the connecting beam 401 and the two buckets 403. The two buckets 403 rotate around points A and D respectively. The opening and closing of the grab buckets are controlled by the extension and retraction of the hydraulic cylinder BC. However, due to the unbalanced resistance between the left and right buckets during operation, the two buckets move asynchronously, causing the buckets 403 to tilt and the center of gravity to deviate. Therefore, a fixed-length synchronous connecting rod 405 BE is required. E is a fixed point on the right grab bucket, which is located on both sides of the connecting beam 401 AD, along with B. The rigid connection of the connecting rod ensures that the movements of the two grab buckets are synchronized. Synchronous connecting rod 405 is located at one end of hydraulic cylinder 404 and one point on the other side of the passive bucket. The left end of the connecting rod rotates together with hydraulic cylinder 404 around the left hinge point of the grab bucket, while the right end of the connecting rod is fixed to the right side of the bucket body 403 and rotates around the right hinge point. Figure 5 Analysis shows that when the load on the left side is greater than that on the right side, the power on the right side is transmitted to the left side through the compression of the connecting rod to provide supplementary torque; when the load on the left side is less than that on the right side, the power on the left side is transmitted to the right side through the tension of the connecting rod to provide supplementary torque. This can balance the resistance on both sides within a certain range, increasing the reliability of the grab bucket, greatly improving the efficiency of the grab bucket, and also avoiding deformation and damage to the bucket body 403 caused by uneven force on the grab bucket.

[0024] like Figure 6 , Figure 7 and Figure 10 As shown, in a preferred embodiment, based on the above method, the drive unit further includes a support 6, which is rigidly connected to the pressure-discharging component 502 by high-strength bolts. The drive motor 601 is coaxially positioned with the support 6 via a flange. The drive motor 601 should be a waterproof motor. When the drive motor 601 is running, it drives the rotating rod 602 to rotate, causing the main bevel gear 603 on the rotating rod 602 to mesh with the secondary bevel gear 604 on the screw 501, thereby causing the water-pressing component to operate and press down to drain the silt grabbed in the bucket 403. It should be noted that in actual use, a protective shell (not shown in the figure) should be installed at the gear meshing point and on the outside of the waterproof motor for protection.

[0025] like Figure 6 and Figure 10 As shown, in a preferred embodiment, based on the above method, the flexible metal pressure plate 5023 further abuts against the inner wall of the bucket 403. The side of the flexible metal pressure plate 5023 is set as an arc surface, which facilitates the scraping of sludge with poor sliding properties on the inner wall of the bucket 403 due to the squeezing out of water when it moves down with the screw 501, thus avoiding the presence of a lot of sludge inside the bucket 403 when unloading. The top wall of the flexible metal pressure plate 5023 is provided with a guide surface that is inclined to one side, which facilitates the smooth sliding of water or sludge moving onto the flexible metal pressure plate 5023.

[0026] like Figure 10 As shown, in a preferred embodiment, based on the above method, in order to facilitate the collection of water squeezed by silt in the bucket 403, a concave hole 7 is opened on the flexible metal pressure plate 5023, and the water is intercepted and collected by the water collection trough 701.

[0027] like Figure 7 and Figure 10As shown, in a preferred embodiment, based on the above method, the rotating rod 602 further includes a first shaft 6021 connected to the drive motor 601, a second shaft 6022 connected to the main bevel gear 603, and an eccentric shaft 6023 disposed between the first shaft 6021 and the second shaft 6022; a first swing member 8 is sleeved on the outer side of the eccentric shaft 6023, and one end of the first swing member 8 away from the eccentric shaft 6023 is connected to the top of the flexible metal pressure plate 5023 through a connecting rod; when the rotating rod 602 rotates, it drives the eccentric shaft 6023 to rotate, and the eccentric shaft 6023 drives the first swing member 8 to move, so that the first swing member 8 drives the flexible metal pressure plate 5023. The 023 reciprocates up and down, and when pressing down on the sludge, it uses mechanical vibration to break down the colloidal structure of the sludge, making it easier to squeeze out the bound water inside the flocs, accelerating the rearrangement of sludge particles of different sizes, and enhancing the solid-liquid separation efficiency. After the bucket 403 lowers the sludge, the output shaft of the drive motor 601 continues to rotate, and the side wall of the flexible metal pressure plate 5023 abuts against the inner wall of the bucket 403, which can scrape off the sludge that is not easy to slide down in the bucket 403 due to the reduction of water content. During this period, the flexible metal pressure plate 5023 is still in a shaking state, so that the sludge adhering to the bottom side of the flexible metal pressure plate 5023 is shaken off, increasing the amount of sludge that the hydraulic grab bucket 4 can grab and lower in a single operation.

[0028] like Figure 6 , Figure 7 , Figure 8 and Figure 11 As shown, in a preferred embodiment, based on the above method, the drainage assembly further includes a drainage cylinder 9 fixed on the lifting plate 5021, an inlet valve and an outlet valve disposed on the drainage cylinder 9, an inlet assembly connected to the inlet valve, a drainage pipe 10 connected to the outlet valve, a piston body 901 slidably connected inside the drainage cylinder 9, and a second swing member 902 movably disposed between the piston body 901 and the eccentric shaft 6023. The second swing member 902 is sleeved on the eccentric shaft 6023; when the eccentric shaft 6023 rotates, it drives the drainage assembly to move, and the eccentric shaft 6023 rotates to move. The spindle 6023 drives the piston body 901 to reciprocate within the drainage cylinder 9 via the second swing component 902. The water collected in the water collection tank 701 is drawn in through the liquid inlet assembly, and the water drawn in through the drainage pipe 10 is discharged from the drainage cylinder 9. It should be noted that the drainage end of the drainage pipe 10 should be located on the outside of the hydraulic grab bucket 4 to prevent the discharged water from falling back into the silt in the bucket body 403. The integrated drainage and water pressure mechanism reduces subsequent operation steps and shortens the time for discharging excess water from the mud chamber of the dredger, thereby improving the overall dredging efficiency of the dredger.

[0029] like Figure 6 , Figure 8 and Figure 11As shown, in a preferred embodiment, based on the above method, the liquid inlet assembly further includes a liquid inlet hose 11 connected to the liquid inlet valve, a movable pipe 111 connected to the end of the liquid inlet hose 11 away from the drain cylinder 9, an abutment plate 112 connected to the lower end of the movable pipe 111, and a float 113 disposed on the upper side of the abutment plate 112. The bottom of the abutment plate 112 has a liquid inlet cone-shaped opening 1121, and the abutment plate 112 is also provided with an air groove 1122 that is inclined upward and communicates with the liquid inlet cone-shaped opening 1121. The abutment plate 112 is placed in the water collection tank 701, and a guide rod 12 is provided between the movable pipe 111 and the water collection tank 701. The movable pipe 111 and the guide rod 12 form a sliding fit and realize vertical movement. The float 113 is made of closed-cell foam aluminum, which provides buoyancy to ensure that the abutment plate 112 always adheres to the sludge liquid surface. As the flexible metal pressure plate 5023 presses down on the sludge below, some of the sludge is carried away by the water. The sludge enters the inlet cone 1121, and the contact plate 112 is pushed upward by the sludge. As the water accumulates, the float 113 drives the contact plate 112 to float to the surface of the sludge, ensuring that the suction port is always at the optimal depth. When the piston body 901 of the drainage assembly performs the suction action, the inlet valve opens to create negative pressure. The sludge water enters the drainage cylinder 9 through the inlet cone 1121, the moving pipe 111, and the inlet hose 11. It can enter the drainage cylinder 9 inside the inlet cone 1121. A filter screen is set up to trap large particles of impurities. When the water in the collection tank 701 is almost completely drained, the float 113 loses its buoyancy, and the abutment plate 112 moves down and comes into contact with the silt in the collection tank 701. At this time, the lower side of the liquid inlet cone 1121 is sealed by the silt. When the piston body 901 continues to move back and forth in the drain cylinder 9, the liquid inlet cone 1121 can draw air through the air groove 1122 to match the reciprocating motion of the piston body 901.

[0030] This invention also discloses a method for using a crane lifting grab bucket with high balance, comprising the following steps: S1: Start the hydraulic winch 3 and lower the hydraulic grab bucket 4 to the designated dredging position via the wire rope; S2: Control the operation of hydraulic cylinder 404 to stretch the piston rod of hydraulic cylinder 404, and rotate the two buckets 403 around the hinge position with the connecting beam 401 as the axis. The two buckets 403 separate and continue to be lowered with the wire rope, and the silt is placed on the upper side of the two buckets 403. The hydraulic cylinder 404 retracts its piston rod, causing the two buckets 403 to approach and close, thus completing the grabbing of silt. S3: Lift the hydraulic grab bucket 4 off the water surface using a steel wire rope; S4: Start the drive motor 601. The output shaft of the drive motor 601 drives the main bevel gear 603 to mesh with the secondary bevel gear 604 on the screw 501 through the rotating rod 602. The screw 501 rotates and moves downward relative to the solenoid 5. The screw 501 drives the pressing component 502 to move downward. The pressing component 502 presses down the silt it grabs through the flexible metal pressure plate 5023 at the bottom, and the water in the silt is squeezed into the water collection tank 701. The eccentric shaft 6023 drives the flexible metal pressure plate 5023 to move up and down reciprocally through the first swinging component 8, thereby breaking the colloidal structure of the sludge and enhancing the solid-liquid separation efficiency. The eccentric shaft 6023 simultaneously drives the piston body 901 to reciprocate within the drain cylinder 9 via the second swing member 902. The drain cylinder 9 draws out the water collected in the water collection tank 701 and discharges it to the outside of the hydraulic grab bucket 4 through the drain pipe 10. S5: After the drainage work is completed, transfer the hydraulic grab bucket 4 to the designated position, control the hydraulic cylinder 404 to separate the two buckets 403 from each other, and let the sludge fall under its own gravity. S6: Drive motor 601 continues to control screw 501 to rotate, flexible metal pressure plate 5023 moves down between two buckets 403, scraping off the silt in buckets 403 that is not easy to slide down due to reduced water content; S7: Control the output shaft of the drive motor 601 to rotate in the opposite direction, and the screw 501 drives the flexible metal pressure plate 5023 to reset so that it can be used for subsequent pressure drainage.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A crane lifting grab with high balance, comprising a hydraulic grab (4) connected to the lifting equipment, characterized in that, The hydraulic grab (4) includes a connecting beam (401) connected to a wire rope, two buckets (403) connected by a hinge shaft (402), and a hydraulic cylinder (404) for driving the two buckets (403) to open and close. The hydraulic grab bucket (4) is equipped with a water pressure and drainage mechanism, which includes a water pressure component for squeezing sludge and a water discharge component for discharging water. The water pressure assembly includes: The spiral tube (5) is fixedly mounted on the connecting beam (401) by a connecting plate; The screw (501) is threadedly connected to the solenoid (5); The pressure plate component (502) is movably disposed on the lower side of the screw (501); The drive unit is disposed on the pressure plate (502) and is connected to the screw (501) for transmission; A synchronous connecting rod (405) is provided between the two buckets (403) to force the two buckets (403) to close synchronously; One end of the synchronous connecting rod (405) is coaxially rotatably connected to the hinge of one of the bucket bodies (403) and the hydraulic cylinder (404), and the other end is movably connected to another bucket body (403) through a pin. The drive unit includes: The support (6) is fixedly mounted on the pressure plate (502); A drive motor (601) is mounted on the support (6); The rotating rod (602) is coaxially connected to the output shaft of the drive motor (601); The main bevel gear (603) is fixedly mounted on the end of the rotating rod (602); A secondary bevel gear (604) is mounted on the screw (501) and meshes with the main bevel gear (603); The press-up component (502) includes: The lifting plate (5021) is connected to the screw (501) and the support (6); An elastic telescopic rod (5022) is vertically installed at the bottom of the lifting plate (5021); The flexible metal pressure plate (5023) is connected to the lifting plate (5021) via the elastic telescopic rod (5022); The flexible metal pressure plate (5023) moves against the inner wall of the bucket body (403), and the top wall of the flexible metal pressure plate (5023) is provided with a guide surface that is inclined to one side; Also includes: A recessed hole (7) is formed on the upper surface of the flexible metal pressure plate (5023); A water collection tank (701) is located at the top of the recess (7) and communicates with the recess (7).

2. The crane lifting grab bucket with high balance according to claim 1, characterized in that, The rotating rod (602) includes: The first shaft (6021) is keyed to the output shaft of the drive motor (601); The second shaft (6022) is fixedly connected to the main bevel gear (603); An eccentric shaft (6023) connects the first shaft (6021) and the second shaft (6022). Also includes: The first swing member (8) is sleeved on the outer wall of the eccentric shaft (6023) and is connected to the flexible metal pressure plate (5023) by a connecting rod.

3. A crane lifting grab bucket with high balance according to claim 2, characterized in that, The drainage assembly includes: A drainage cylinder (9) is fixedly mounted on the lifting plate (5021); The piston body (901) is slidably disposed in the inner cavity of the drain cylinder (9); The second swing member (902) connects the piston body (901) and the eccentric shaft (6023). The drain cylinder (9) is equipped with an inlet valve and an outlet valve. The drain cylinder (9) is connected to a drain pipe (10) through the outlet valve. The drain cylinder (9) is connected to an inlet assembly through the inlet valve.

4. A crane lifting grab bucket with high balance according to claim 3, characterized in that, The liquid inlet assembly includes: The inlet hose (11) is connected to the inlet valve at one end and to a movable tube (111) placed in the water collection tank (701) at the other end. A contact plate (112) is provided on the lower side of the moving pipe (111) for contacting the silt in the water collection tank (701); The float (113) is fixed on the upper side of the abutment plate (112) and moves the abutment plate (112) upward under the action of buoyancy; The liquid inlet cone-shaped port (1121) is located on the lower side of the abutment plate (112) and is connected to the moving tube (111); An air trough (1122) is inclined upward on the abutment plate (112) and connected to the liquid inlet cone (1121); A guide rod (12) is slidably connected between the moving pipe (111) and the water collection tank (701).

5. A crane grab bucket with high balance according to claim 4, wherein the lifting equipment includes a hydraulic winch (3), the hydraulic winch (3) suspends the hydraulic grab bucket (4) by a wire rope, and the hydraulic winch (3) is installed on the hull (1) by a support seat (2).

6. A method of using a crane lifting grab bucket with high balance as described in claim 5, characterized in that, Includes the following steps: S1: Start the hydraulic winch (3) and lower the hydraulic grab bucket (4) to the designated dredging position via the wire rope; S2: Control the operation of the hydraulic cylinder (404) to stretch the piston rod of the hydraulic cylinder (404), and rotate the two buckets (403) around the hinge position with the connecting beam (401) as the axis. The two buckets (403) separate and continue to be lowered with the wire rope, and the silt is placed on the upper side of the two buckets (403). Control the hydraulic cylinder (404) to retract the piston rod, and the two buckets (403) move closer to each other and close, completing the grabbing of silt; S3: Lift the hydraulic grab bucket (4) off the water surface by using a steel wire rope; S4: Start the drive motor (601). The output shaft of the drive motor (601) drives the main bevel gear (603) to mesh with the secondary bevel gear (604) on the screw (501) through the rotating rod (602). The screw (501) rotates and moves downward relative to the solenoid (5). The screw (501) drives the pressing component (502) to move down. The pressing component (502) presses down the silt it grabs through the flexible metal pressure plate (5023) at the bottom, and the water in the silt is squeezed into the water collection tank (701). The eccentric shaft (6023) drives the flexible metal pressure plate (5023) to move up and down repeatedly through the first swinging component (8), thereby destroying the colloidal structure of the sludge and enhancing the solid-liquid separation efficiency. The eccentric shaft (6023) simultaneously drives the piston body (901) to reciprocate within the drain cylinder (9) via the second swing component (902). The drain cylinder (9) draws out the water collected in the water collection tank (701) and discharges it to the outside of the hydraulic grab bucket (4) through the drain pipe (10). S5: After the drainage work is completed, transfer the hydraulic grab (4) to the designated position, control the hydraulic cylinder (404) to separate the two buckets (403) from each other, and let the sludge fall under its own gravity; S6: The drive motor (601) continues to control the screw (501) to rotate, and the flexible metal pressure plate (5023) moves down between the two buckets (403) to scrape off the silt in the buckets (403) that is not easy to slide down due to the reduced water content; S7: Control the output shaft of the drive motor (601) to rotate in the opposite direction, and the screw (501) drives the flexible metal pressure plate (5023) to reset so that it can be used for subsequent pressure drainage.

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