Grab mechanism with an extended bucket and diaphragm wall trencher having the same

Abstract

The application belongs to the field of underground construction machinery and equipment, and particularly relates to a grab bucket mechanism with an extension bucket and a diaphragm wall trencher with the grab bucket mechanism; the grab bucket mechanism comprises a guide support, a linear loading mechanism, two grab buckets and two pushing rods; the grab bucket is connected to the lower end of the guide support through a first rotating shaft, and the linear loading mechanism is installed on the guide support in the middle relative to the two grab buckets; a second notch is formed on the opening side of the grab bucket, and an extension bucket is connected to each of the two grab buckets through a second rotating shaft on the opening side of the grab bucket; the extension bucket enlarges the grabbing range of the grab bucket on the outside of the second notch, and the opening and closing directions of the extension bucket and the grab bucket are the same; the diaphragm wall trencher comprises a chassis, a vehicle body, a winch, a supporting arm and the grab bucket mechanism; the single grabbing range is enlarged by adding the extension bucket on the grab bucket, and the use efficiency of the diaphragm wall trencher is higher.

Description

Technical Field

[0001] This invention belongs to the field of underground construction machinery and equipment, specifically relating to a grab bucket mechanism with an extended bucket and a continuous wall trenching machine having the grab bucket mechanism. Background Technology

[0002] A trenching machine, also known as a grooving machine, is a piece of machinery used to excavate trenches from the ground surface downwards during the construction of diaphragm walls. Its main trenching component is a hydraulic grab bucket. When the grab bucket excavates trenches downwards from the ground surface, the underground soil may mix with groundwater to form clay (soil with high viscosity) or rare earth elements (soil with high water content).

[0003] Because the trenching machine takes a long time to grab soil once, and the volume of soil that the grab bucket can hold is limited, the work efficiency within one work cycle is not high.

[0004] To address the aforementioned problems, this invention proposes a grab bucket mechanism with an extended bucket and a continuous wall trenching machine incorporating the grab bucket mechanism. Summary of the Invention

[0005] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0006] The present invention provides the following technical solution: a grab bucket mechanism with an extended bucket, comprising a guide bracket, a linear loading mechanism, two grab buckets and two push rods; The grab bucket is connected to the lower end of the guide bracket via the first rotating shaft. The linear loading mechanism is installed on the guide bracket in the center relative to the two grab buckets. The grab bucket has a second notch on its open side. Each of the two grab buckets is connected to an extension bucket via the second rotating shaft on its open side. The extension bucket expands the grab bucket's grabbing range outside the second notch. The extension bucket and the grab bucket it is attached to open and close in the same direction. The grab bucket is equipped with a handle parallel to the first rotating shaft. The handle is offset from the first rotating shaft and closer to the opening side of the grab bucket than the first rotating shaft. The grab bucket has a first notch above the handle. Each of the two grab buckets is connected to the drive end of the linear loading mechanism through a push rod. The upper end of the push rod is hinged to the drive end of the linear loading mechanism, and the lower end is movably connected to the handle through an elongated hole. A spring is installed in the elongated hole, and the spring pushes the handle downward. The extension bucket is equipped with an upward-facing push plate that expands outward relative to the grab bucket. A tension spring is connected between the push plate and the guide bracket, and the tension spring keeps the extension bucket in an opening tendency. A support rod is fixedly connected to the push rod above the elongated hole, and the support rod is in contact with the push plate. When the grab bucket mechanism is in the first state, the drive end of the linear loading mechanism lifts the two push rods. The handle is located at the bottom of the elongated hole of the push rod. The push rod lifts the two grab buckets to complete the opening action. The support rod contacts the top of the push plate. The potential energy of the tension spring causes the two extended buckets to open. When the grab mechanism is in the second state, the drive end of the linear loading mechanism pushes out the two push rods, the support rod contacts the bottom of the push plate, and the support rod pushes the two extended buckets to complete the closing action. The handle is located at the top of the elongated hole of the push rod, and the push rod pushes the two grabs to complete the closing action.

[0007] Furthermore, a reinforcing plate is provided at the lower edge of the grab bucket opening. The reinforcing plate is blade-shaped with one end larger than the other. The smaller end of the reinforcing plate points towards the grab bucket's locking direction. The larger end of the reinforcing plate is hollow inside, and a torsion shaft passes through it. A torsion spring connects the torsion shaft to the inner wall of the reinforcing plate. Both ends of the torsion shaft extend from the grab bucket and connect to the cleaning frame. The cleaning frame includes two vertical rods and one horizontal rod. The two vertical rods of the cleaning frame are respectively connected to the two ends of the torsion shaft. The vertical rods are circumferentially fixed relative to the torsion shaft, and the cleaning frame maintains an upward tilted posture. The horizontal rod of the cleaning frame is in movable contact with the bottom plate of the extension bucket, and the vertical rod is in movable contact with the side wall of the extension bucket.

[0008] Furthermore, each push rod is connected to two support rods, which are connected to both sides of the push rod via support rods; a pressure plate is connected between the two support rods, and the pressure plate is located above the first notch of the grab bucket; the pressure plate is used to squeeze the material grabbed by the grab bucket through the first notch as the support rods move.

[0009] Furthermore, the guide bracket has a centrally located mounting slot relative to the two grabs, and the linear loading mechanism is installed in the mounting slot. The linear loading mechanism includes a hydraulic cylinder, a slider, and a guide rail. The guide rail is installed on the two side walls of the mounting slot, the hydraulic cylinder is installed on the top of the mounting slot, the slider is connected to the end of the cylinder rod of the hydraulic cylinder, the slider slides in cooperation with the guide rails on both sides, the hydraulic cylinder pushes the slider to slide up and down along the guide rail, the upper end of the push rod is hinged to the slider, and the guide bracket has a through slot below the mounting slot, the lower end of the push rod passes through the through slot and is connected to the handle.

[0010] Furthermore, the side of the push plate that contacts the support rod has raised strips, which are parallel to the transverse direction of the push plate and evenly arranged along the longitudinal direction of the push plate. The end of the support rod that contacts the push plate is rounded, and the support rod moves between the raised strips.

[0011] Furthermore, a support rib connects the push plate and the expansion bucket.

[0012] Furthermore, the blades of the extended buckets are covered with shovel teeth, and the shovel teeth on the two extended buckets are interlocked.

[0013] A continuous wall trenching machine includes a chassis, a vehicle body, a winch, a support arm, and a grab bucket mechanism. The chassis is a tracked chassis, and the vehicle body is mounted on the turntable of the chassis. The lower end of the support arm is hinged to the vehicle body, and the support arm is pushed up and down by a lifting cylinder on the vehicle body. The winch is mounted on the vehicle body, and the steel cable on the winch passes around the fixed pulley at the top of the support arm and is connected to the guide bracket of the grab bucket mechanism. The winch pulls the grab bucket mechanism to move up and down.

[0014] Compared with the prior art, the advantages of the present invention are: This invention provides a grab bucket mechanism with an extension bucket. An extension bucket is added to the grab bucket. When grabbing soil, the extension bucket first pushes the soil towards the grab bucket, and then the extension bucket and grab bucket close to grab the soil, expanding the grab bucket mechanism's grabbing range. The extension bucket and grab bucket are driven by a linear loading mechanism, resulting in a simple structure. Furthermore, the mechanical structure coordinates the movements of the extension bucket and grab bucket, ensuring structural reliability and a low failure rate. A cleaning frame is added to clean the inner wall of the extension bucket. The cleaning frame automatically cleans the soil adhering to the inner wall of the extension bucket as the extension bucket opens and closes, preventing it from affecting the volume of soil grabbed in subsequent grabbing operations. Attached Figure Description

[0015] Figure 1 A schematic diagram of a grab bucket mechanism with an extended bucket; Figure 2 A schematic diagram for reinforcing the tie plate and cleaning frame; Figure 3 A cross-sectional view of the grab bucket and the extended bucket; Figure 4 A schematic diagram showing the cooperation between the strut and the push plate; Figure 5 This is a schematic diagram of a continuous wall trenching machine.

[0016] In the diagram: 1-Guide bracket; 1.1-Mounting slot; 1.2-Through slot; 2-Grab bucket; 2.1-First notch; 2.2-Second notch; 3-Push rod; 3.1-Elongated hole; 4-First rotating shaft; 5-Second rotating shaft; 6-Extended bucket; 6.1-Scoop teeth; 7-Handle; 8-Hydraulic cylinder; 9-Spring; 10-Push plate; 10.1-Protruding strip; 11-Tension spring; 12-Support rod; 13-Reinforcing pull plate; 14-Torsion shaft; 15-Cleaning frame; 16-Support rod; 17-Pressure plate; 18-Slider; 19-Guide rail; 20-Support rib; 21-Chassis; 22-Vehicle body; 23-Winch; 24-Support arm. Detailed Implementation

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Example 1 like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown: A grab bucket mechanism with an extended bucket includes a guide bracket 1, a linear loading mechanism, two grab buckets 2 and two push rods 3.

[0019] The grab bucket 2 is connected to the lower end of the guide bracket 1 via the first rotating shaft 4. The guide bracket 1 is provided with a notch that allows the grab bucket 2 to flip. The linear loading mechanism is installed on the guide bracket 1 with the two grab buckets 2 in the center. The grab bucket 2 has a second notch 2.2 on its opening side, which penetrates the lower edge of the opening side of the grab bucket 2. Each of the two grab buckets 2 is connected to an extension bucket 6 via a second rotating shaft 5 on its opening side. The extension bucket 6 expands the grab range of the grab bucket 2 outside the second notch 2.2. The opening and closing direction of the extension bucket 6 is the same as that of the grab bucket 2, that is, the extension bucket 6 increases the opening angle of the grab bucket 2.

[0020] The grab bucket 2 is equipped with a handle 7 parallel to the first rotating shaft 4. The handle 7 is cylindrical and is offset from the first rotating shaft 4, closer to the opening side of the grab bucket than the first rotating shaft 4. The grab bucket 2 has a first notch 2.1 above the handle 7. The push rod 3 extends into the grab bucket 2 through the first notch 2.1. Each of the two grab buckets 2 is connected to the drive end of the linear loading mechanism through a push rod 3. The upper end of the push rod 3 is hinged to the drive end of the linear loading mechanism, and the lower end is movably connected to the handle 7 through the elongated hole 3.1. A spring 9 is installed in the elongated hole 3.1, and the spring 9 pushes the handle 7 downward. The extension bucket 6 is equipped with an upward-facing push plate 10 that expands outward relative to the grab bucket 2. A tension spring 11 is connected between the push plate 10 and the guide bracket 1, and the tension spring 11 keeps the extension bucket 6 in an opening trend. A support rod 12 is fixedly connected to the push rod 3 above the elongated hole 3.1, and the support rod 12 is in contact with the push plate 10.

[0021] When the two grabs 2 are closed, the handle 7 is at the same height as the first rotating shaft 4 or the handle 7 is higher than the first rotating shaft 4. In this way, the vertical component of the force of the push rod 3 acts on the handle 7, pushing the handle 7 to make the grab 2 rotate around the first rotating shaft 4, and the two grabs 2 are closed. The horizontal component of the force of the push rod 3 is resisted by the first rotating shaft 4 and the guide bracket 1.

[0022] When the grab mechanism is in the first state, the drive end of the linear loading mechanism lifts the two push rods 3. The handle 7 is located at the bottom of the elongated hole 3.1 of the push rod 3. The push rod 3 lifts the two grab buckets 2 to complete the opening action. The support rod 12 contacts the top of the push plate 10. The potential energy of the tension spring 11 causes the two extended buckets 6 to open. When the grab mechanism is in the second state, the drive end of the linear loading mechanism pushes out the two push rods 3, the support rod 12 contacts the bottom of the push plate 10, the support rod 12 pushes the two extended buckets 6 to complete the closing action, the handle 7 is located at the top of the elongated hole of the push rod 3, and the push rod 3 pushes the two grab buckets 2 to complete the closing action.

[0023] During the soil-grabbing process of the grab bucket mechanism, which is the process of the grab bucket mechanism transitioning from the first state to the second state, the extended bucket 6 first cuts into the soil. As the driving end of the linear loading mechanism pushes out the two push rods 3, the thrust of the push rods 3 acts directly on the push plate 10 through the support rod 12, causing the extended bucket 6 to close towards the grab bucket 2. In the first stage, only the extended bucket 6 moves. The grab bucket 2 is resisted by the soil, causing the handle 7 on the grab bucket 2 to move upward in the elongated hole 3.1 of the push rod 3 when it is pushed out (overcoming the elastic force of the spring 9). When the handle 7 moves to the top of the elongated hole 3.1 (the spring 9 can no longer be compressed), in the second stage, the thrust of the push rod 3 causes the extended bucket 6 and the grab bucket 2 to close together. The design of the extended bucket 6 moving first and the grab bucket 2 moving after a period of rest ensures that when only the extended bucket 6 moves, it pushes the surrounding soil towards the grab bucket 2. Finally, the grab bucket 2 and the extended bucket 6 grab the soil together, resulting in a large grabbing range.

[0024] During the process of the grab bucket mechanism releasing soil, which is the process of the grab bucket mechanism transitioning from the second state to the first state, the drive end of the linear loading mechanism lifts the two push rods 3. After the support rod 12 releases the force, the potential energy of the tension spring 11 causes the two extended buckets 6 to open. The elastic force of the spring 9 causes the handle 7 to move towards the bottom of the elongated hole 3.1 of the push rod 3, and the two grab buckets 2 open. The push rod 3 continues to lift the two grab buckets 2 to complete the opening action. During the process of the grab bucket mechanism releasing soil, the opening sequence of the grab buckets 2 and the extended buckets 6 does not affect the release of soil.

[0025] The guide bracket 1 is a rectangular frame welded from steel sections. A rectangular mounting groove 1.1 is centrally located on the guide bracket 1, opposite the two grabs 2. A linear loading mechanism is installed within the mounting groove 1.1. The linear loading mechanism includes a hydraulic cylinder 8, a slider 18, and guide rails 19. Guide rails 19 are mounted on the two side walls of the mounting groove 1.1. The hydraulic cylinder 8 is mounted on the top of the mounting groove 1.1. The slider 18 is connected to the end of the cylinder rod of the hydraulic cylinder 8. The slider 18 slides along the guide rails 19 on both sides. The hydraulic cylinder 8 pushes the slider 18 to slide up and down along the guide rails 19. The upper end of the push rod 3 is hinged to the slider 18. A through groove 1.2 is opened below the mounting groove 1.1 on the guide bracket 1. The lower end of the push rod 3 passes through the through groove 1.2 and connects to the handle 7.

[0026] Specifically, the hydraulic cylinder 8 is centrally installed in the mounting groove 1.1 of the guide bracket 1, and the two push rods 3, the two grab buckets 2 and the two extension buckets 6 are symmetrically arranged with the hydraulic cylinder 8 as the axis of symmetry.

[0027] A reinforcing plate 13 is provided at the lower edge of the opening of the grab bucket 2. The reinforcing plate 13 is blade-shaped with one end larger than the other. The smaller end of the reinforcing plate 13 points towards the snapping direction of the grab bucket 2. The larger end of the reinforcing plate 13 is hollow inside. A torsion shaft 14 passes through the larger end of the reinforcing plate 13. A torsion spring is connected between the torsion shaft 14 and the inner wall of the reinforcing plate 13. The two ends of the torsion shaft 14 pass through the grab bucket 2 and are connected to the cleaning frame 15. The cleaning frame 15 includes two vertical rods and one horizontal rod. The two vertical rods of the cleaning frame 15 are respectively connected to the two ends of the torsion shaft 14. The vertical rods are circumferentially fixed relative to the torsion shaft 14. The cleaning frame 15 maintains an upward tilted posture. The horizontal rod of the cleaning frame 15 is in movable contact with the bottom plate of the extension bucket 6, and the vertical rod is in movable contact with the side wall of the extension bucket 6.

[0028] Both grab bucket 2 and extender bucket 6 are in their pre-excavation positions. After the guide support 1 is lowered to the bottom of the excavation trench, extender bucket 6 cuts into the soil before grab bucket 2. As extender bucket 6 cuts into the soil and pushes the soil towards the bottom of grab bucket 2, extender bucket 6 and grab bucket 2 gradually move closer together. Consequently, the cleaning frame 15, initially located at the bottom of extender bucket 6, is compressed and moves to the top of extender bucket 6. The reinforcing plate 13 has a triangular cross-section, which facilitates smooth cutting into the soil. Moreover, the simultaneous cutting of the soil by extender bucket 6 and reinforcing plate 13 helps to separate the soil at the bottom of the trench into multiple pieces. By cutting the soil pieces, it is easier to lift them. When grab bucket 2 closes, the bottom of extender bucket 6 also closes to prevent soil leakage during lifting. After the soil is grabbed from the trough, and the grab bucket 2 is moved to the soil lowering position by the troughing machine, the grab bucket 2 and the extension bucket 6 open under the drive of the hydraulic cylinder 61, and the soil falls from the grab bucket 2. At the same time, the cleaning frame 15 resets under the action of the torsion spring. During the reset process, the cleaning frame 15 can clean the inner wall of the extension bucket 6, scraping off the soil adhering to the inner wall of the extension bucket 6. In the prior art, there is only one grab bucket 2, and it is difficult to clean the soil adhering to the inner wall of the grab bucket 2. In this embodiment, a second notch 2.2 is opened at the lower part of the grab bucket 2, and the extension bucket 6 and the cleaning frame 15 on the inner side of the extension bucket 6 are provided outside the second notch 2.2. This not only allows more soil to be grabbed at once, but also automatically cleans the soil adhering to the inner wall of the extension bucket 6 when the soil is lowered, so as to avoid affecting the volume of soil grabbed next time.

[0029] Each push rod 3 is connected to two support rods 12, and the two support rods 12 are connected to both sides of the push rod 3 by support rods 16; a pressure plate 17 is connected between the two support rods 12, and the pressure plate 17 is located above the first notch 2.1 of the grab bucket 2; the pressure plate 17 is used to move with the support rods 12 and squeeze the material grabbed by the grab bucket 2 through the first notch 2.1.

[0030] The side of the push plate 10 that contacts the support rod 12 has protruding ribs 10.1. These ribs 10.1 are parallel to the transverse direction of the push plate 10 and are evenly distributed along its longitudinal direction. The end of the support rod 12 that contacts the push plate 10 is rounded, and the support rod 12 moves between the protruding ribs 10.1. Because of the protruding ribs 10.1 on the push plate 10, combined with the elastic force of the tension spring 11, the support rod 12 slides over the push plate 10, causing the push plate 10 to oscillate slightly. This oscillation directly acts on the expanding bucket 6, creating a vibration effect as the expanding bucket 6 cuts into the soil, making it easier for the expanding bucket 6 to cut into the soil. During the opening of the expanding bucket 6, the elastic force of the tension spring 11 and the combination of the protruding ribs 10.1 and the support rod 12 again cause the push plate 10 to oscillate slightly, creating a vibration effect as the expanding bucket 6 opens, which helps to shake off the soil inside the expanding bucket 6.

[0031] A supporting rib 20 is connected between the push plate 10 and the extension bucket 6 to increase the connection strength between the push plate 10 and the extension bucket 6.

[0032] The blade of the extended bucket 6 is provided with shovel teeth 6.1, and the shovel teeth 6.1 on the two extended buckets 6 are interlocked. The shovel teeth 6.1 on the blade of the extended bucket 6 facilitate the extended bucket 6 to cut smoothly into the soil. Moreover, when the two grab buckets 2 are closed, the shovel teeth 6.1 on the two extended buckets 6 also interlock, preventing the soil from spilling out during the movement.

[0033] Example 2 like Figure 5 As shown: A continuous wall trenching machine includes a chassis 21, a vehicle body 22, a winch 23, a support arm 24, and a grab bucket mechanism. The chassis 21, vehicle body 22, winch 23, and support arm 24 are all basic structures of existing continuous wall trenching machines, and this embodiment does not innovate on this part of the existing technology. The chassis 21 is a tracked chassis, the vehicle body 22 is mounted on the turntable of the chassis 21, the lower end of the support arm 24 is hinged to the vehicle body 22, and the support arm 24 is pushed up and down by the lifting cylinder on the vehicle body 22. The winch 23 is mounted on the vehicle body 22, and the steel cable on the winch 23 passes around the fixed pulley at the top of the support arm 24 and is connected to the guide bracket 1 of the grab bucket mechanism. The winch 23 pulls the grab bucket mechanism to move up and down.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grab bucket mechanism with an extended bucket, characterized in that: It includes a guide bracket (1), a linear loading mechanism, two grabs (2) and two push rods (3); The grab bucket (2) is connected to the lower end of the guide bracket (1) via the first rotating shaft (4). The linear loading mechanism is installed on the guide bracket (1) with the two grab buckets (2) in the middle. The grab bucket (2) has a second notch (2.2) on its open side. Each of the two grab buckets (2) is connected to an extension bucket (6) via the second rotating shaft (5) on its open side. The extension bucket (6) expands the grab range of the grab bucket (2) outside the second notch (2.2). The opening and closing directions of the extension bucket (6) and the grab bucket (2) are the same. A handle (7) parallel to the first rotating shaft (4) is provided inside the grab (2). The handle (7) is offset from the first rotating shaft (4) and closer to the open side of the grab than the first rotating shaft (4). A first notch (2.1) is opened on the grab (2) above the handle (7). Each of the two grabs (2) is connected to the drive end of the linear loading mechanism through a push rod (3). The upper end of the push rod (3) is hinged to the drive end of the linear loading mechanism, and the lower end is movable to the handle (7) through the elongated hole (3.1). A spring (9) is installed inside the elongated hole (3.1), and the spring (9) pushes the handle (7) downward; an upward-expanding push plate (10) is installed on the extended bucket (6) and expands outward relative to the grab bucket (2), and a tension spring (11) is connected between the push plate (10) and the guide bracket (1), and the tension spring (11) keeps the extended bucket (6) in an opening trend; a support rod (12) is fixedly connected to the push rod (3) above the elongated hole (3.1), and the support rod (12) keeps in contact with the push plate (10); The grab bucket mechanism is in the first state. The driving end of the linear loading mechanism lifts the two push rods (3). The handle (7) is located at the bottom of the long hole (3.1) of the push rod (3). The push rod (3) lifts the two grab buckets (2) to complete the opening action. The support rod (12) contacts the top of the push plate (10). The potential energy of the tension spring (11) causes the two extended buckets (6) to open. The grab bucket mechanism is in the second state. The driving end of the linear loading mechanism pushes out the two push rods (3). The support rod (12) contacts the bottom of the push plate (10). The support rod (12) pushes the two extended buckets (6) to complete the closing action. The handle (7) is located at the top of the long hole of the push rod (3). The push rod (3) pushes the two grab buckets (2) to complete the closing action.

2. The grab bucket mechanism with an extended bucket according to claim 1, characterized in that: A reinforcing plate (13) is provided at the lower edge of the opening of the grab bucket (2). The reinforcing plate (13) is blade-shaped with one end larger than the other. The smaller end of the reinforcing plate (13) points towards the snapping direction of the grab bucket (2). The larger end of the reinforcing plate (13) is hollow inside. A torsion shaft (14) passes through the larger end of the reinforcing plate (13). A torsion spring connects the torsion shaft (14) and the inner wall of the reinforcing plate (13). The two ends of the cleaning frame (15) extend from the grab bucket (2) and are connected to the cleaning frame (15). The cleaning frame (15) includes two vertical rods and one horizontal rod. The two vertical rods of the cleaning frame (15) are respectively connected to the two ends of the torsion shaft (14). The vertical rods are fixed circumferentially relative to the torsion shaft (14). The cleaning frame (15) maintains an upward tilt posture. The horizontal rod of the cleaning frame (15) is in movable contact with the bottom plate of the extension bucket (6), and the vertical rod is in movable contact with the side wall of the extension bucket (6).

3. A grab bucket mechanism with an extended bucket according to claim 2, characterized in that: Each of the aforementioned push rods (3) is connected to two support rods (12), and the two support rods (12) are connected to both sides of the push rod (3) via support rods (16); a pressure plate (17) is connected between the two support rods (12), and the pressure plate (17) is located above the first notch (2.1) of the grab bucket (2); the pressure plate (17) is used to move with the support rods (12) and squeeze the material grabbed by the grab bucket (2) through the first notch (2.1).

4. A grab bucket mechanism with an extended bucket according to claim 3, characterized in that: The guide bracket (1) is provided with an installation groove (1.1) in the center of the two grabs (2). The linear loading mechanism is installed in the installation groove (1.1). The linear loading mechanism includes a hydraulic cylinder (8), a slider (18) and a guide rail (19). The guide rail (19) is installed on the two side walls of the installation groove (1.1). The hydraulic cylinder (8) is installed on the top of the installation groove (1.1). The slider (18) is connected to the cylinder rod end of the hydraulic cylinder (8). The slider (18) is slidably engaged with the guide rails (19) on both sides. The hydraulic cylinder (8) pushes the slider (18) to slide up and down along the guide rails (19). The upper end of the push rod (3) is hinged to the slider (18). The guide bracket (1) has a through groove (1.2) below the installation groove (1.1). The lower end of the push rod (3) passes through the through groove (1.2) and is connected to the handle (7).

5. A grab bucket mechanism with an extended bucket according to claim 1, characterized in that: The push plate (10) has protrusions (10.1) distributed on the side that contacts the support rod (12). The protrusions (10.1) are parallel to the push plate (10) in the transverse direction and are evenly arranged along the longitudinal direction of the push plate (10). The end of the support rod (12) that contacts the push plate (10) is set to a round head. The support rod (12) moves between the protrusions (10.1).

6. A grab bucket mechanism with an extended bucket according to claim 5, characterized in that: A supporting rib (20) is connected between the push plate (10) and the expansion bucket (6).

7. A grab bucket mechanism with an extended bucket according to claim 1, characterized in that: The blade of the extended bucket (6) is provided with shovel teeth (6.1), and the shovel teeth (6.1) on the two extended buckets (6) are interlocked.

8. A continuous wall trenching machine, characterized in that: The system includes a chassis (21), a vehicle body (22), a winch (23), a support arm (24), and a grab bucket mechanism as described in any one of claims 1 to 7. The chassis (21) is a tracked chassis, the vehicle body (22) is mounted on the turntable of the chassis (21), the lower end of the support arm (24) is hinged to the vehicle body (22), and the support arm (24) is pushed up and down by the lifting cylinder on the vehicle body (22). The winch (23) is mounted on the vehicle body (22), and the steel cable on the winch (23) passes around the fixed pulley at the top of the support arm (24) and connects to the guide bracket (1) of the grab bucket mechanism. The winch (23) pulls the grab bucket mechanism up and down.

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