A pile pulling apparatus

Abstract

The utility model discloses a kind of pile pulling tools, with tool shell, sliding frame sliding in tool shell, two clamping blocks and hydraulic cylinder rotatingly connected in the lower end of sliding frame, one end of hydraulic cylinder is pivotally connected on sliding frame, the other end is pivotally connected on tool shell;The bottom surface of an activity seat is provided with two inverted U-shaped pivot joints respectively rotatingly connected two clamping blocks;Sliding frame is provided with vertical fixed plate connecting two vertical rods in the lower part of two vertical rods, and activity seat is provided with vertical side plate abutting to the side surface of vertical fixed plate, and vertical side plate is provided with two vertical long strip holes corresponding two bolt holes, and two bolts are respectively locked on two bolt holes through two vertical long strip holes;The pile pulling tool of the utility model provides clamping force to clamping block during pile pulling, and clamping structure is more stable, which can avoid loosening or slipping of clamping structure of clamping block and pile during pile pulling, and the pile pulling force is strong, so that the pile is more easily and quickly pulled out, and the pile pulling effect and efficiency are high.

Description

Technical Field

[0001] This invention relates to the field of construction machinery technology, and in particular to a pile extraction attachment. Background Technology

[0002] During construction, it is necessary to remove temporary piles that need to be set up within the construction plane according to the plan and measures, temporary piles set up in lakes and rivers for environmental protection, and piles in the soil after the demolition of old buildings to effectively utilize land resources in the process of urbanization. Existing hydraulic pile extractors are equipped with pile clamps for holding the piles and cranes for lifting and moving the pile clamps. The pile clamps are equipped with a clamping mechanism for holding the piles, a hydraulic cylinder for driving the clamping mechanism to hold the piles, and a hydraulic cylinder for lifting the clamping mechanism to pull the piles out of the soil section by section. Since the hydraulic cylinder for clamping the piles and the hydraulic cylinder for pulling the piles are two separate components that work independently, during the process of the hydraulic cylinder for pulling the piles and lifting the pile clamps to pull the piles upwards, the clamping structure of the hydraulic cylinder for clamping the piles may loosen or slip due to the loosening of the piles and upward movement. This results in the inability to apply force well to loosen the piles at the beginning of the extraction process, making the extraction difficult, slow, and inefficient.

[0003] In view of this, the inventors, in response to the numerous deficiencies and inconveniences caused by the imperfections in the structure of the aforementioned pile-pulling attachments, have deeply conceived, actively researched, and actively researched and tested improvements to develop and design this invention. Summary of the Invention

[0004] The purpose of this invention is to provide a pile extraction attachment. The hydraulic cylinder pushes the sliding frame to move upward to extract the pile, and at the same time, the vertical fixed plate drives the movable seat to move upward together. The pile clamping structure and the pile extraction structure are combined together, which can prevent the clamping block and the pile clamping structure from loosening or slipping during the pile extraction process. The pile extraction clamping force is strong, making the pile easier and faster to extract, and the pile extraction effect and efficiency are high.

[0005] To achieve the above objectives, the solution of the present invention is:

[0006] A pile extraction attachment includes an attachment housing, a sliding frame that slides up and down within the attachment housing, two clamping blocks pivotally connected to the lower end of the sliding frame, and a hydraulic cylinder. One end of the hydraulic cylinder is pivotally connected to the sliding frame, and the other end is pivotally connected to the attachment housing. The sliding frame has two vertical rods and a horizontal rod connected to the top of the two vertical rods. The bottom ends of the two vertical rods are pivotally connected to one end of two connecting rods, and the other ends of the two connecting rods are pivotally connected to the outer ends of two clamping blocks. The bottom surface of a movable seat is provided with two inverted U-shaped pivot parts, and the middle parts of the two clamping blocks are pivotally connected to the two inverted U-shaped pivot parts through pivot shafts. The sliding frame has a vertical fixing plate connecting the two vertical rods at the lower part of the two vertical rods, and the vertical fixing plate is provided with two bolt holes. The movable seat is provided with a vertical side plate that abuts against the side of the vertical fixing plate. The vertical side plate is provided with two vertical elongated holes corresponding to the two bolt holes, and the two bolts pass through the two vertical elongated holes and are locked in the two bolt holes. When the vertical fixing plate and the movable seat move relative to each other, the bolts slide in the vertical elongated holes.

[0007] The movable seat has a transverse side plate extending outward from the bottom end of the vertical side plate. The vertical fixed plate is provided with two winglets arranged parallel to the transverse side plate. A spring is provided between each winglet and the transverse side plate. The winglet is locked with a spring positioning bolt extending out of the bottom surface of the winglet. The upper end of the spring is sleeved on the spring positioning bolt and fixed to the bottom surface of the winglet. The lower end of the spring is abutted and fixed to the top surface of the transverse side plate.

[0008] When the bolt abuts against the bottom end of the vertical elongated hole, there is a gap between the bottom end of the spring positioning bolt and the top surface of the transverse side plate.

[0009] The attachment housing has a base plate that rests against the ground, and the base plate has a first slot for the top or side of the pile to be inserted; the transverse side plate has a second slot corresponding to the first slot; the piston seat of the hydraulic cylinder is pivotally connected to the base plate, and the end of the piston rod of the hydraulic cylinder is pivotally connected to the side of the transverse rod.

[0010] The bottom surface of the transverse side plate is provided with a downwardly extending lower limit plate that can abut against the bottom plate.

[0011] In the vertical direction, the pivot position of both the clamping block and the connecting rod is higher than the pivot position of both the clamping block and the inverted U-shaped pivot.

[0012] With the above structure, when the pile extraction tool of the present invention is used to extract a pile, the tool is aligned with the pile, and the pile is clamped between the two clamping blocks. The hydraulic cylinder is driven to push the sliding frame upward. First, the upward movement of the sliding frame drives the clamping block to rotate around the pivot axis to clamp the pile. Then, when the clamping block can no longer rotate and remains clamped, the upward movement of the sliding frame drives the clamping block to clamp the pile and extract it. Finally, the mechanical arm is used to completely extract the pile and lay it flat. During the upward movement of the sliding frame, the sliding frame also drives the vertical fixing plate to move upward. The bolt moves from the bottom end of the vertical elongated hole to the top end of the vertical elongated hole. When the vertical fixing plate moves upward, it drives the movable seat to move upward together, combining the pile clamping structure and the pile extraction structure. When the vertical fixing plate and the movable seat move relative to each other, the bolt moves vertically. The bolt slides within the elongated vertical hole. When the bolt abuts against the top of the hole, the relative positions of the vertical fixed plate and the movable seat are fixed, and they automatically lock together and move synchronously. The bolt and the structure of the elongated vertical hole restrict the downward movement of the movable seat, thereby restricting the clamping block from rotating outward to release the pile. The clamping block can firmly clamp the pile and quickly pull it out. When the bolt moves away from the top of the hole, the position between the movable seat and the vertical fixed plate is not fixed, and the movable seat and the vertical fixed plate can move independently, making it more flexible to use. Moreover, during the pile extraction process, the upward movement of the sliding frame continuously provides the clamping block with a clamping force, making the pile clamping structure more stable. This can prevent the clamping block and the pile clamping structure from loosening or slipping during the pile extraction process. The strong clamping force makes it easier and faster to pull out the pile, resulting in high pile extraction effect and efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the pile-pulling attachment of the present invention in use;

[0014] Figure 2 This is a schematic diagram of the pile-pulling attachment of the present invention aligning with the pile;

[0015] Figure 3 This is a frontal view of the pile-pulling attachment of the present invention aligned with the pile.

[0016] Figure 4 This is a side view of the pile-pulling attachment of the present invention aligned with the pile;

[0017] Figure 5 This is a front view schematic diagram of the pile clamping device of the present invention;

[0018] Figure 6 for Figure 3 Enlarged view of point A in the middle;

[0019] Figure 7 for Figure 5 Enlarged view of point B in the middle;

[0020] Figure 8This is a schematic diagram of the structure of the pile-pulling attachment of the present invention, showing the removal of the attachment housing;

[0021] Figure 9 This is a schematic diagram of the structure of the pile-pulling attachment of the present invention, showing the removal of the attachment housing from another direction;

[0022] Figure 10 This is an exploded view of the sliding frame and movable seat in the pile-pulling attachment of the present invention;

[0023] Figure 11 This is a schematic diagram of the structure of the attachment housing of the pile extractor of the present invention;

[0024] Figure 12 This is a schematic diagram of the attachment housing of the pile extractor of the present invention from another direction;

[0025] Figure 13 This is a top view of the housing of the attachments of the pile extractor of the present invention;

[0026] Figure 14 This is a bottom view of the housing of the attachment of the pile extractor of the present invention.

[0027] Symbol Explanation

[0028] 10 hoisting equipment; 20 robotic arms; 100 piles; 2 pile extraction attachments; 1 attachment housing; 21 sliding frame; 22 clamping block; 23 hydraulic cylinder; 211 vertical rod; 212 horizontal rod; 213 connecting rod; 24 movable seat; 244 inverted U-shaped pivot; 245 pivot shaft; 214 vertical fixing plate; 2141 bolt holes; 241 vertical side plate; 2411 vertical elongated hole; 2412 bolt; 242 horizontal side plate; 2413 wing; 25 spring; 2414 spring positioning bolt; 11 base plate; 111 first slot. Second slot 2421; lower limit plate 243; extension rod 2111; front side plate 12; rear side plate 13; side plate 14; L-shaped vertical plate 15; sliding groove 16; reinforcing plate 151; square slot 153; notch 146; heat dissipation hole 154; window 131; cover plate 132; through hole 133; inclined plate 112; trumpet-shaped slot 113; cracked stone block 114; pivot seat 3; flat plate 134; first vertical plate 31; second vertical plate 32; connecting plate 33; pivot part 321; assembly groove 221; top stop block 222. Detailed Implementation

[0029] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0030] Please see Figures 1 to 14This invention discloses a pile extraction attachment 2, which includes an attachment housing 1, a sliding frame 21 that slides up and down within the attachment housing 1, two clamping blocks 22 pivotally connected to the lower end of the sliding frame 21, and a hydraulic cylinder 23. One end of the hydraulic cylinder 23 is pivotally connected to the sliding frame 21, and the other end is pivotally connected to the attachment housing 1. The sliding frame 21 has two vertical rods 211 and a horizontal rod 212 connected to the top ends of the two vertical rods 211. The bottom ends of the two vertical rods 211 are pivotally connected to one end of two connecting rods 213, and the other ends of the two connecting rods 213 are pivotally connected to the outer ends of the two clamping blocks 22. The bottom surface of a movable seat 24 is provided with two inverted U-shaped pivot portions 244, and the middle portion of the two clamping blocks 22... The sliding frame 21 is pivotally connected to the two inverted U-shaped pivot parts 244 via the pivot shaft 245; the sliding frame 21 has a vertical fixing plate 214 connecting the two vertical rods 211 at the lower part of the two vertical rods 211, and the vertical fixing plate 214 has two bolt holes 2141; the movable seat 24 has a vertical side plate 241 that abuts against the side of the vertical fixing plate 214, and the vertical side plate 241 has two vertical elongated holes 2411 corresponding to the two bolt holes 2141, and two bolts 2412 pass through the two vertical elongated holes 2411 and are locked in the two bolt holes 2141 respectively; when the vertical fixing plate 214 and the movable seat 24 move relative to each other, the bolts 2412 slide in the vertical elongated holes 2411.

[0031] The pile extraction attachment of this invention is assembled on the robotic arm 20 of the hoisting equipment 10. When using it for pile extraction, the attachment is aligned with the pile 100, so that the pile 100 is positioned between the two clamping blocks 22. The hydraulic cylinder 23 is driven to push the sliding frame 21 upwards. First, the upward movement of the sliding frame 21 drives the clamping blocks 22 to rotate around the pivot shaft 245, clamping the pile 100. Then, when the clamping blocks 22 can no longer rotate and remain clamped to the pile 100, the upward movement of the sliding frame 21 drives the clamping blocks 22 to clamp the pile 100 and pull it out. Finally, the robotic arm 20 completely pulls out the pile 100 and lays it flat. During the upward movement of the sliding frame 21, the sliding frame 21 also drives the vertical fixation... When plate 214 moves upward, bolt 2412 moves from the bottom end of vertical elongated hole 2411 to the top end of vertical elongated hole 2411. As vertical fixed plate 214 moves upward, it drives movable seat 24 upward as well, combining the pile clamping structure and the pile extraction structure. When vertical fixed plate 214 and movable seat 24 move relative to each other, bolt 2412 slides within vertical elongated hole 2411. When bolt 2412 abuts against the top end of vertical elongated hole 2411, the relative position between vertical fixed plate 214 and movable seat 24 is fixed, and they automatically lock together and move synchronously. Furthermore, the mating structure of bolt 2412 and vertical elongated hole 2411 restricts the downward movement of movable seat 24, thereby limiting clamping. When block 22 rotates outward to loosen pile 100, clamping block 22 can firmly clamp pile 100 and quickly pull out pile 100; when bolt 2412 is away from the top of vertical elongated hole 2411, the position between movable seat 24 and vertical fixed plate 214 is not fixed, and movable seat 24 and vertical fixed plate 214 can move independently, making it more flexible to use; moreover, this pile pulling attachment uses a hydraulic cylinder 23 to perform pile clamping and pulling work. During the pile pulling process, while the hydraulic cylinder 23 pushes the sliding frame 21 to move upward to pull the pile, it continuously provides clamping force to clamping block 22 to clamp pile 100, making the pile clamping structure more stable and preventing the clamping structure of clamping block 22 and pile 100 from loosening or slipping during the pile pulling process, thus ensuring the pile is clamped tightly. The hydraulic cylinder 23 provides strong force, making it easier and faster to pull out the pile, resulting in high pile extraction effect and efficiency. Furthermore, it reduces the number of hydraulic cylinders 23 required, lowering the equipment cost of the pile extractor, and making the extraction method simpler and safer. During the pile extraction process, because the pile is firmly buried underground, a large force is needed initially to loosen it, followed by a smaller force to pull it out completely. Therefore, the pile extraction attachment first uses the hydraulic cylinder 23 to loosen the pile 100 and pull it out to a certain depth, then uses the robotic arm 20 to completely extract the pile 100. The short stroke of the hydraulic cylinder 23 driving the pile extraction mechanism allows for rapid pile extraction, improving efficiency and avoiding energy consumption. It also reduces the size of the pile extraction attachment, resulting in a simpler structure.

[0032] The movable seat 24 of the present invention has a transverse side plate 242 extending outward from the bottom end of the vertical side plate 241. The vertical fixed plate 214 is provided with two winglets 2413 arranged parallel to the transverse side plate 242. A spring 25 is provided between each winglet 2413 and the transverse side plate 242. The winglet 2413 is locked with a spring positioning bolt 2414 extending out of the bottom surface of the winglet 2413. The upper end of the spring 25 is sleeved on the spring positioning bolt 2414 and fixed to the bottom surface of the winglet 2413, and the lower end of the spring 25 is abutted and fixed to the top surface of the transverse side plate 242. When the hydraulic cylinder 23 pushes the sliding frame 21 to move upward to pull the pile, the sliding frame 21 drives the vertical fixed plate 214 to move upward. The bolt 2412 moves from the bottom end of the vertical elongated hole 2411 to the top end of the vertical elongated hole 2411. The distance between 413 and the transverse side plate 242 increases, and the vertical fixed plate moves upward with the force of the tension spring 25. When the vertical fixed plate 214 moves upward, it drives the movable seat 24 to move upward together to pull out the pile, resulting in a fast pile pulling speed. When the hydraulic cylinder 23 stops pushing the sliding frame 21 to move upward, the vertical fixed plate 214 is in a stationary state. The vertical fixed plate 214 does not have the force of the tension spring 25. The restoring force of the spring 25 pushes the movable seat 24 to move downward relative to the vertical fixed plate 214. The bolt 2412 moves from the top of the vertical elongated hole 2411 to the bottom of the vertical elongated hole 2411. The distance between the wing 2413 and the transverse side plate 242 decreases, and the movable seat 24 pushes the clamping block 22 to rotate outward around the pivot shaft 245 to release the pile 100. The pile is automatically released, making the operation more convenient.

[0033] When the bolt 2412 abuts against the bottom end of the vertical elongated hole 2411, there is a gap between the bottom end of the spring positioning bolt 2414 and the top surface of the transverse side plate 242; this prevents the spring positioning bolt 2414 from colliding with the transverse side plate 242 when the spring is reset.

[0034] The attachment housing 1 of the present invention has a base plate 11 that rests against the ground. The base plate 11 is provided with a first slot 111 for the top or side of the pile 100 to be inserted. The transverse side plate 242 is provided with a second slot 2421 corresponding to the first slot 111. Two clamping blocks 22 are located below the sides of the second slot. The piston seat of the hydraulic cylinder 23 is pivotally connected to the base plate 11, and the piston rod end of the hydraulic cylinder 23 is pivotally connected to the side of the transverse rod 212. When the pile is pulled out and aligned, the base plate 11 of the attachment housing 1 rests against the ground, and the pile 100 is inserted into the first slot 111 and the second slot 2421. Then, the hydraulic cylinder 23 is driven to push the sliding frame 21 to move upward, thereby driving the clamping blocks 22 to clamp the pile and pull out the pile, making the pile pulling operation simpler.

[0035] The bottom surface of the transverse side plate 242 of the present invention is provided with a lower limiting plate 243 that extends downward and can abut against the bottom plate 11; when the sliding frame 21 moves downward, the lower limiting plate 243 can limit the minimum distance between the movable seat 24 and the bottom plate 11, so as to prevent the clamping block 22 below the movable seat 24 from colliding with or abutting against the bottom plate 11, affecting the rotation of the clamping block 22 to clamp or release the pile.

[0036] In the vertical direction, the pivot position of the clamping block 22 and the connecting rod 213 is higher than the pivot position of the clamping block 22 and the inverted U-shaped pivot 244. The upward movement of the connecting rod causes the upper part of the clamping block 22 to rotate from the outside to the inside to clamp the pile 100. The clamping force of the clamping block 22 is downward, which can firmly clamp the pile 100 and prevent the clamping block 22 and the pile 100 from separating.

[0037] The two vertical rods 211 of the present invention are hollow rods, and the bottom ends of the two vertical rods 211 are respectively provided with extension rods 2111, and one end of the connecting rod 213 is pivotally connected to the extension rods 2111.

[0038] The attachment housing 1 of the present invention further includes a front side plate 12, a rear side plate 13, and two side plates 14. The front side plate 12 is connected to the upper front side of the two side plates 14 on both sides, and the rear side plate 13 is connected to the rear side of the two side plates 14 on both sides. An L-shaped vertical plate 15 is respectively provided on the inner side of the two side plates 14. One side of the L-shaped vertical plate 15 is connected to the side plate 14, the other side is connected to the rear side plate 13, and the bottom end is connected to the bottom plate 11. The two L-shaped vertical plates 15 and the front side plate 12 form two sliding grooves 16 on the two side plates 14 for the vertical rod 211 to move up and down. The sliding grooves 16 can restrict the vertical movement direction of the sliding frame 21, which is more conducive to the vertical extraction of the pile by the pile extraction attachment. The lower front side of the two side plates 14 has no obstruction structure, allowing the pile clamping structure to be exposed, making it convenient to check whether the pile is clamped and the pile extraction situation.

[0039] A reinforcing plate 151 is connected between the lower parts of the two L-shaped vertical plates 15 of the present invention. The reinforcing plate 151 extends and abuts against the base plate 11. Both the L-shaped vertical plates 15 and the reinforcing plate 151 can enhance the structural strength of the accessory housing 1. The reinforcing plate 151 is provided with a pivot groove for pivoting the piston seat. The pivot groove facilitates the pivoting of the piston seat of the hydraulic cylinder 23.

[0040] The lower part of the side where the L-shaped vertical plate 15 and the side plate 14 are connected is provided with a square slot 153, and the side plate 14 is provided with a notch 146 corresponding to the square slot 153. The square slot 153 and the notch 146 provide clearance space for the operation of the pile clamping structure; and the side where the L-shaped vertical plate 15 and the rear side plate 14 are connected is provided with a plurality of heat dissipation holes 154.

[0041] The rear side plate 13 of the present invention has a window 131, which is covered by a cover plate 132. The cover plate 132 has a through hole 133 for the oil pipe of the hydraulic cylinder 23 to pass through.

[0042] The base plate 11 of the present invention has inclined plates 112 extending outward on both sides of the first slot 111, and the two inclined plates 112 are spaced apart by a funnel-shaped slot 113 that gradually expands outward from the first slot 111, so as to facilitate the alignment and insertion of the pile 100 into the first slot 111.

[0043] The bottom surface of the base plate 11 of the attachment housing 1 of the present invention is provided with three circumferentially circumferentially distributed cracked stone blocks 114 on the outer periphery of the first slot 111. The cross-section of the cracked stone blocks 114 is an inverted triangular structure. The cracked stone blocks 114 facilitate the application of force by the pile-pulling attachment to pull the pile.

[0044] The attachment housing 1 of the present invention is provided with a pivot seat 3 on its side wall, which is pivotally connected to the robotic arm 20. The rear side plate 13 is locked with a flat plate 134 extending out of one of the side plates 14. The pivot seat 3 is locked on the flat plate 134 and closely abuts against one side of the side plate 14. The pivot seat 3 has a first vertical plate 31 that abuts against and is locked on the side of the flat plate 134, two parallel and spaced second vertical plates 32 that are perpendicular to the first vertical plate 31, and a connecting plate 33 that is perpendicular to the two second vertical plates 32 and extends to the first vertical plate 31 on one side. The second vertical plate 32 is triangular, and pivot parts 321 that are pivotally connected to the robotic arm 20 are respectively provided at both ends of the upper side of the second vertical plate 32. The slot of the first slot 11 faces the cab of the hoisting equipment 10. When the operator operates the pile extraction attachment to extract the pile, the positional relationship between the pile extraction attachment and the pile can be observed from the cab, which facilitates the operation of the pile extraction work.

[0045] The clamping block 22 of the present invention has an assembly groove 221 on the side facing the pile. The assembly groove 221 is used to assemble the top clamping block 222 that clamps the pile by locking bolts. The top clamping block 222 is locked onto the clamping block 22 to clamp the pile. The top clamping block 222 and the clamping block 22 are separate structures. Different top clamping blocks can be selected according to the outer circumference of different piles, which can facilitate the extraction of different piles and has a wide range of applications.

[0046] The above embodiments and accompanying drawings are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A pile-pulling attachment, characterized in that: The pile extraction tool includes a tool housing, a sliding frame that slides up and down within the tool housing, two clamping blocks pivotally connected to the lower end of the sliding frame, and a hydraulic cylinder. One end of the hydraulic cylinder is pivotally connected to the sliding frame, and the other end is pivotally connected to the tool housing. The sliding frame has two vertical rods and a horizontal rod connected to the top of the two vertical rods. The bottom ends of the two vertical rods are pivotally connected to one end of two connecting rods, and the other ends of the two connecting rods are pivotally connected to the outer ends of the two clamping blocks. The bottom surface of a movable seat is provided with two inverted U-shaped pivot parts, and the middle parts of the two clamping blocks are pivotally connected to the two inverted U-shaped pivot parts via pivot shafts. The sliding frame has a vertical fixing plate connecting the two vertical rods at the lower part of the two vertical rods, and the vertical fixing plate has two bolt holes. The movable seat has a vertical support that abuts against the side of the vertical fixing plate. The side plate has two vertical elongated holes corresponding to the two bolt holes. The two bolts pass through the two vertical elongated holes and are locked onto the two bolt holes. When the vertical fixed plate and the movable seat move relative to each other, the bolts slide within the vertical elongated holes. The movable seat has a transverse side plate extending outward from the bottom end of the vertical side plate. The vertical fixed plate has two winglets arranged parallel to the transverse side plate. A spring is arranged between each winglet and the transverse side plate. The winglet is locked with a spring positioning bolt extending out of the bottom surface of the winglet. The upper end of the spring is sleeved on the spring positioning bolt and fixed to the bottom surface of the winglet. The lower end of the spring abuts and is fixed to the top surface of the transverse side plate.

2. The pile-pulling attachment as described in claim 1, characterized in that: When the bolt abuts against the bottom end of the vertical elongated hole, there is a gap between the bottom end of the spring positioning bolt and the top surface of the transverse side plate.

3. The pile-pulling attachment as described in claim 1, characterized in that: The attachment housing has a base plate that rests against the ground, and the base plate has a first slot for the top or side of the pile to be inserted; the transverse side plate has a second slot corresponding to the first slot; the piston seat of the hydraulic cylinder is pivotally connected to the base plate, and the end of the piston rod of the hydraulic cylinder is pivotally connected to the side of the transverse rod.

4. The pile extraction attachment as described in claim 1, characterized in that: The bottom surface of the transverse side plate is provided with a downwardly extending lower limit plate that can abut against the bottom plate.

5. The pile-pulling attachment as described in claim 1, characterized in that: In the vertical direction, the pivot position of both the clamping block and the connecting rod is higher than the pivot position of both the clamping block and the inverted U-shaped pivot.

Images