CN217150402U

CN217150402U - Mechanical gripper for transporting precast pile in pile foundation construction site

Info

Publication number: CN217150402U
Application number: CN202220841144.XU
Authority: CN
Inventors: 陈洁; 陆海浪; 庄光明
Original assignee: Zhejiang Wanjian Construction Co ltd
Current assignee: Zhejiang Wanjian Construction Co ltd
Priority date: 2022-04-12
Filing date: 2022-04-12
Publication date: 2022-08-09
Anticipated expiration: 2032-04-12

Abstract

The utility model discloses a mechanical claw for transporting precast piles in pile foundation construction sites, which comprises a connecting frame detachably connected with a connector of an excavator arm, and a pair of arc-shaped clamping arms for embracing piles, which are hinged on the connecting frame and driven by a hydraulic cylinder, wherein the connecting frame is provided with reinforcing rods extending out of two sides of the connecting frame; the reinforcing rod is parallel to the axis of the precast pile, one end of the cable is fixedly connected with the precast pile, and the other end of the cable is detachably connected with the outer end of the reinforcing rod; the two ends of the reinforcing rods extending out of the connecting frame are provided with adjusting structures for adjusting the length of the reinforcing rods at each end; each arc-shaped clamping arm is composed of a group of arc-shaped clamping jaws which are arranged in parallel, the top of each arc-shaped clamping arm is hinged to the connecting frame through a hinge shaft, one end of the hydraulic cylinder is hinged to the middle arc-shaped clamping jaw, and the free end of the piston rod of the hydraulic cylinder is hinged to the connecting frame. The mechanical grab is convenient to operate, stable and safe in grabbing and clamping in the transportation process, and improves the construction efficiency.

Description

Mechanical gripper for transporting precast pile in pile foundation construction site

Technical Field

The utility model relates to a pile foundation construction equipment technical field specifically says a mechanical claw for transportation of pile foundation construction site precast pile.

Background

The pile foundation is called pile foundation for short, and is generally composed of pile and pile top bearing platform. The stake is including bored concrete pile and precast pile, and the precast pile includes tubular pile, bamboo joint stake and square pile, and tubular pile and bamboo joint stake are the stake commonly used in the precast pile. The part of the pile foundation mainly bearing the gravity is the precast pile part, so the precast pile is also called as the pile foundation in the industry. The length or height of each precast pile is generally 7-15 m, and more 7-12 m.

The precast pile is put the stake and is generally adopted the pile driver, and the ground of piling of precast pile on the pile foundation construction site generally all has one section distance from the pile driver, so though pile driver itself has hoist device, nevertheless owing to pile the ground distance and keep away from apart from the precast pile, the transportation problem of precast pile in the building site can not be solved to this hoist device. In the prior art, a large pile hoisting machine is generally adopted to transport precast piles in a construction site, but the prefabricated piles are large in size and slow in moving speed, and in addition, the piles are hoisted to swing back and forth in the transportation process, so that the construction efficiency is not high, and the personal safety of construction workers in the construction site is possibly difficult to guarantee. Some grab buckets adopting the excavator serve as precast pile transportation tools in the pile foundation construction site, the precast piles are transversely placed on the grab buckets of the excavator and are bound by ropes and the like. Compared with a large pile hoisting machine for transporting precast piles, the moving speed is accelerated, the shaking phenomenon of the precast piles in the transporting process is reduced, but the process of placing the precast piles in a grab bucket of an excavator is troublesome, the binding and unbinding processes are troublesome, the pile hoisting can be hoisted only by manual binding after the precast piles are transported to the pile pressing machine, and the operation is inconvenient; the construction efficiency is still not high; the pile body is easily abraded in the transportation process; and because there is no special clamping device, the stability and safety of the transportation process are still not ideal.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a convenient operation, transportation grab the machinery that is used for pile foundation construction site precast pile transportation of card stability, safety and improvement efficiency of construction and grab.

The technical solution of the utility model is, a mechanical claw for transportation of pile foundation construction site precast pile is provided, include with the link of the connector detachable connection of the arm of excavator, articulate on the link and by a pair of arc arm lock for embracing the pile of pneumatic cylinder driven, have the anchor strut that stretches out the link both sides on the link, there is the hawser that fixed precast pile used in the transportation in two outer ends of anchor strut.

After the structure above the adoption, the utility model relates to a mechanical claw for transportation of pile foundation construction site precast pile has following advantage: the defects that in the prior art, a large-scale pile hoisting machine is adopted to transport precast piles in a construction site, the size is large, the moving speed is low, the piles are hoisted to shake back and forth in the transportation process, the construction efficiency is low, and potential safety hazards exist are overcome, and the defects that the loading and unloading processes are troublesome and the transportation process stability and safety are insufficient when an excavator bucket is adopted to transport precast piles are overcome. Will the utility model discloses a machinery is grabbed and is connected with the excavator like crawler excavator's arm is the connector of excavator arm promptly, utilize the excavator to transport the precast pile to pile driver department from the pile in pile foundation construction work ground, the excavator adopts machinery to grab from the pile department directly snatch roughly in the middle of precast pile length, the workman sets up the hawser and the corresponding section of precast pile at anchor strut both ends, the excavator transports the precast pile to pile driver department after, the workman removes the hawser, the excavator opens machinery and grabs and leave, the workman articulates the hawser to the lifting hook of pressing the pile driver on, alright get into and press a stake operation. The excavator adopts the mechanical grab to transport the precast pile, the loading and unloading are convenient, the walking is flexible and rapid, the transport speed of the precast pile is greatly improved, and the pile foundation construction efficiency is greatly improved. And in the transportation process of the precast pile, because the mechanical grab is firmly grabbed and the cables at the two ends of the reinforcing rod are further reinforced, the mechanical grab is fixed, and the two cables are fixed, so that double insurance is realized, the precast pile is firmly and stably connected in the transportation process, and the personal safety of construction workers is ensured.

Furthermore, the stiffening rod is parallel with the axis of the precast pile, and the cable is detachably connected with the outer end of the stiffening rod. After the structure is adopted, a worker can detachably connect one end of the cable with the outer end of the reinforcing rod by mechanically grabbing the precast pile before transportation, such as sleeving or hooping the cable and the precast pile, and such as fixing by adopting a cable clamp, and then hanging the cable on a hook of the reinforcing rod; after the pile is transported to the pile press, the mechanical grab is loosened, the connector of the excavator arm is slightly moved downwards, the detachable connection is loosened, such as the cable is separated from the hook, and then the cable is hung on the lifting hook of the pile press, so that the pile press operation can be carried out. The precast pile can be assembled and disassembled more conveniently and quickly, the construction efficiency is further improved, and the safety is better.

Furthermore, the two ends of the reinforcing rods extending out of the connecting frame are provided with adjusting structures for adjusting the length of the reinforcing rods at each end. After the structure more than adopting, can satisfy the precast pile of different length and utilize anchor strut and hawser to the reinforced demand of precast pile in the transportation, shorten length in order to reduce shared space and reduce transportation and storage cost when being convenient for again machinery is grabbed not time self transportation or is placed.

Furthermore, each arc-shaped clamping arm is composed of a group of arc-shaped clamping jaws which are arranged in parallel, the top of each arc-shaped clamping arm is hinged to the connecting frame through a hinge shaft, one end of a hydraulic cylinder which drives each arc-shaped clamping arm to open and close is hinged to the arc-shaped clamping jaw in the middle of the group of arc-shaped clamping jaws, and the free end of a piston rod of the hydraulic cylinder is hinged to the connecting frame. After the structure more than adopting, every arc arm lock becomes holistic splint and is a plurality of parallel arrangement's along width evenly distributed clamping jaw, and the same material, the face of involving snatching is multiplied increase, and a plurality of clamping jaws are better than the elasticity of whole arm lock, and the grip is stronger promptly, and the firm point of the firm more, more balanced, the card to the precast pile is better.

Furtherly, an arc arm lock comprises three parallel arrangement's arc clamping jaw, and another arc arm lock comprises four parallel arrangement's arc clamping jaw, and two arc arm locks can interlock each other: three arc-shaped clamping jaws of one arc-shaped clamping arm can be deeply inserted into the gaps between the adjacent clamping jaws of the four arc-shaped clamping jaws of the other arc-shaped clamping arm. After the structure more than adopting, existing grip, the bottom of clamping jaw still forms the holding power, and a pair of arc arm lock can constitute the annular arm of embracing, has further guaranteed firm stability and the security that precast pile transportation connects. Still make this machinery grab the needs that adapts to different diameter piles and different cross-section piles to snatch the transportation, accommodation is wider.

Furthermore, the tops of the three arc-shaped clamping jaws are hinged to the connecting frame through a hinge shaft, and one end of the hydraulic cylinder is hinged to one arc-shaped clamping jaw in the middle of the three arc-shaped clamping jaws; the tops of two arc-shaped clamping jaws in the middle of the four arc-shaped clamping jaws are hinged to the connecting frame through a hinge shaft, one end of the hydraulic cylinder is hinged to the two arc-shaped clamping jaws in the middle of the four arc-shaped clamping jaws, and a plurality of connecting rods for connecting the four arc-shaped clamping jaws are arranged at the tops of the four arc-shaped clamping jaws. After structure more than adopting, the clamping jaw group of the three arc clamping jaw in a pair of arc arm lock and the clamping jaw group of four arc clamping jaws with the articulated flexibility and the pneumatic cylinder driven flexibility and the reliability of connecting seat better, the structure of a pair of arc arm lock is more firm, the stability of precast pile transportation is better.

Furthermore, an inward concave arc-shaped steel plate for buffering is connected to the inward concave surface of each arc-shaped clamping jaw through a plurality of compression springs. After the structure is adopted, the mechanical grab can be firmly and stably held in the transportation process after grasping the precast pile, and a certain buffer effect can be achieved in the grasping process during the grasping process and the transportation process, so that the precast pile or the mechanical grab can be prevented from being damaged possibly.

Furthermore, a rubber plate for protection is attached to the inner concave surface of the inner concave arc-shaped steel plate. After the structure is adopted, the contact surface of the mechanical gripper and the peripheral surface of the precast pile is made of flexible materials, so that gripping is facilitated, gripping stability is stable, and scraping injury to the peripheral surface of the precast pile, such as the outer peripheral surface of a tubular pile, caused by the concave surface of the clamping jaw forming the clamping arm in the gripping process is avoided.

Furthermore, the connecting frame is divided into an upper connecting frame and a lower connecting frame, and a hydraulic drive turntable is fixedly connected between the upper connecting frame and the lower connecting frame; the upper connecting frame is provided with two lug plates which are symmetrically arranged and are used for being connected with a connector of an arm of the excavator, and each lug plate is provided with two through holes for penetrating and connecting bolts; the two arc-shaped clamping arms are hinged on the lower connecting frame; the reinforcing rod is fixedly connected to the lower connecting frame; the free end of the piston rod of each hydraulic cylinder is hinged to the lower connecting frame, and the bottom end of each hydraulic cylinder is hinged to the arc-shaped clamping arm for the pile embracing. After the structure above is adopted, the turntable or the rotating device can rotate for 360 degrees under the operation of an excavator operator, so that the lower connecting frame is driven to rotate, the mechanical grabbing and grabbing of the precast pile and the placing of the precast pile are more convenient and rapid, and the construction efficiency is further improved.

Drawings

Fig. 1 is a first schematic structural diagram of the mechanical grab of the present invention (the rope is schematically connected, and the hook is not shown).

Fig. 2 is a second schematic structural diagram of the mechanical grab of the present invention (the rope is schematically connected, and the hook is not shown).

Fig. 3 is a third schematic structural diagram of the mechanical grab of the present invention (the rope is schematically connected, and the hook is not shown).

Fig. 4 is a structural schematic diagram of the mechanical grab of the present invention (the rope is schematically connected, the hook is not shown, and the reinforcing rod adjusting structure is shown).

Fig. 5 is a schematic view of the mechanical grab of the present invention when installed on a crawler excavator (showing the hooks, not showing the reinforcement bar adjustment structure).

Fig. 6 is a schematic view of the cable of fig. 5 being hooked to a steel slide bar of a reinforcing bar.

Shown in the figure: 1. the hydraulic excavator comprises a cable, 2, a hinge shaft, 3, a free end of a piston rod, 4, a connecting frame, 5, an arc-shaped steel plate, 6, a reinforcing rod, 7, an arc-shaped clamping arm, 8, a rubber plate, 9, a hydraulic cylinder, 10, a hydraulic driving turntable, 11, an ear plate, 12, a through hole, 13, an arc-shaped clamping jaw, 14, a pressure spring, 15, a circular plate of a lower connecting frame, 16, a worm and gear driving disc, 17, a circular plate of an upper connecting frame, 18, a fixed circular plate, 19, an upper connecting frame, 20, a hydraulic rotating motor, 21, a lower connecting frame, 22, a connecting rod, 23, a steel sliding rod, 24, a fastening screw, 25, a steel sleeve, 26, a gap, 27, a flat steel plate, 28, an excavator, 29, an excavator arm, 30, a connecting head, 31 and a hook.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding the present invention, but the present invention is not limited thereto. Furthermore, the technical features mentioned in the following embodiments of the present invention may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, the utility model is used for mechanical claw of pile foundation construction site precast pile transportation, include with the arm of excavator 28 promptly excavator arm 29's connector 30 detachable connection's link 4, articulate on link 4 and by a pair of arc arm lock 7 for the pile of embracing of pneumatic cylinder 9 driven. Excavator 28 is such as a crawler excavator. The hydraulic cylinder 9 is also called as oil cylinder. The detachable connection, for example, by using a pin or a bolt and a nut fixed on the connecting head 30, is connected with the through holes 12 of the two ear plates 11 of the connecting frame 4.

As shown in fig. 1, 2, 3, 4, 5 and 6, the connecting frame 4 is provided with reinforcing rods 6 extending out of both ends of the connecting frame 4, and both outer ends of the reinforcing rods 6 are provided with cables 1 for fixing the precast piles during transportation. The reinforcing rods 6 are parallel to the axis of the precast pile (not shown in the drawings). The cable 1 is connected with the precast pile, and the cable and the outer end of the reinforcing rod 6 can be detachably connected, as shown in fig. 5 and 6, one embodiment can be: the cable 1 may be formed as a loop of a set of tight or hooped bars over the precast pile, the top end of which may be hooked to a hook 31 welded to the outer end of the reinforcing bar 6, e.g. the outer end of a steel slide bar 23 described below. If the cable 1 is made of steel wire rope, the steel wire rope can be welded or made into a ring which is fastened or hooped on the precast pile by using a rope clamp.

As shown in fig. 4, the reinforcing rods 6 are provided with an adjusting structure for adjusting the length of the reinforcing rods 6 at each end at both ends extending out of the connecting frame 4. Specifically, the fixing section of the reinforcing rod 6 and the connecting frame 4 may be a steel sleeve 25, two ends of the steel sleeve 25 are respectively provided with a steel sliding rod 23 axially slidably fitted in the steel sleeve 25, two ends of the steel sleeve 25 are respectively provided with a radial threaded hole, and when the steel sliding rod 23 is adjusted to a required length position, the steel sliding rod 23 is tightly abutted by a fastening screw 24 screwed in the threaded hole to fix the relative position of the steel sliding rod 23 and the steel sleeve 25.

As shown in fig. 1, 2, 3 and 4, each of the arc-shaped clamping arms 7 is composed of a set of arc-shaped clamping jaws 13 arranged in parallel, the top of each of the arc-shaped clamping arms 7 is hinged to the connecting frame 4 through a hinge shaft 2, one end of a hydraulic cylinder 9 driving each of the arc-shaped clamping arms 7 to open and close is hinged to the arc-shaped clamping jaw 13 in the middle of each of the arc-shaped clamping arms 7, namely the set of arc-shaped clamping jaws 13, and the free end 3 of a piston rod of the hydraulic cylinder 9 is hinged to the connecting frame 4. It will be understood that the two cylinders 9 act in synchronism.

As shown in fig. 1, one of the arc-shaped clamping arms 7 can be composed of three arc-shaped clamping jaws 13 arranged in parallel, and as shown in fig. 2, the other arc-shaped clamping arm 7 can be composed of four arc-shaped clamping jaws 13 arranged in parallel. As shown in fig. 4, the two arc-shaped clipping arms 7 can be engaged with each other: the three arc-shaped clamping jaws 13 of one arc-shaped clamping arm 7 can penetrate into the gaps 26 between the adjacent arc-shaped clamping jaws of the four arc-shaped clamping jaws 13 of the other arc-shaped clamping arm 7.

As shown in fig. 1, 2 and 3, the tops of the three arc-shaped clamping jaws 13 are hinged to the connecting frame 4 through a hinge shaft 2, and one end of the hydraulic cylinder 9 is hinged to one arc-shaped clamping jaw 13 in the middle of the three arc-shaped clamping jaws 13; the tops of two arc-shaped clamping jaws 13 in the middle of the four arc-shaped clamping jaws 13 are hinged to the connecting frame 4 through a hinge shaft 2, one end of the hydraulic cylinder 9 is hinged to the two arc-shaped clamping jaws 13 in the middle of the four arc-shaped clamping jaws 13, and the tops of the four arc-shaped clamping jaws 13 are provided with a plurality of connecting rods 22 for connecting the four arc-shaped clamping jaws like three.

As shown in fig. 1 and 2, an inward concave arc steel plate 5 for buffering is connected to an inward concave surface of each arc-shaped clamping jaw 13 through a plurality of, for example, two compression springs 14. The connection is as follows: one end of each pressure spring 14 is welded with the outer convex surface of the arc-shaped steel plate 5, and the other end of each pressure spring 14 is welded with the inner concave surface of the arc-shaped clamping jaw 13.

As shown in fig. 1, the inner concave surface of the concave arc-shaped steel plate 5 is attached with a rubber plate 8 for protection by using a strong adhesive, or the rubber plate is provided with a plurality of counter bores, the inner concave surface of the concave arc-shaped steel plate is provided with a plurality of threaded holes, and the rubber plate is fastened on the inner concave surface of the concave arc-shaped steel plate by using the counter screws in one-to-one correspondence (not shown in the structure diagram).

As shown in fig. 2, 3 and 4, the connecting frame 4 is preferably divided into an upper connecting frame 19 and a lower connecting frame 21, and the upper connecting frame 19 and the lower connecting frame 21 are fixedly connected, for example, welded with the hydraulic drive turntable 10. The hydraulically driven rotary disk 10 may be a commercially available product. For example, Xuzhou City, Jiangsu province: the type SE3-62-h-16R hydraulic rotary disc of a worm gear high-altitude operation vehicle rotation speed reducer sold by Jiangsu Shuangzheng machinery Limited company is driven to rotate, is simply called as a hydraulic drive rotary disc 10 herein, and comprises a hydraulic rotary motor 20 or a rotary hydraulic cylinder and a worm gear drive disc 16. The circular plate 17 of the upper link may be fixedly connected, e.g., welded or screwed, to the fixed circular plate 18 at the top of the hydraulic drive turret 10, and the circular plate 15 of the lower link may be fixedly connected, e.g., welded, to the bottom of the circular housing of the rotatable worm drive plate 16 of the hydraulic drive turret 10. Of course, if the hydraulic driving rotary table is not provided, the position of the hydraulic driving rotary table can be a fixed frame which is connected with the upper connecting frame and the lower connecting frame.

As shown in fig. 2, 3 and 4, two symmetrically arranged ear plates 11 for connecting with a connector 30 of an excavator arm 29 are welded on the circular plate 17 of the upper connecting frame 19, and each ear plate 11 is provided with two through holes 12 for penetrating pin shafts or bolts. The two arc-shaped clamping arms 7 are hinged on the lower connecting frame 21, for example, the tops of the arc-shaped clamping jaws 13 of each arc-shaped clamping arm 7 are hinged on the lower connecting frame 21 through a hinge shaft 2. The reinforcing rod 6 is fixedly connected to the lower connecting frame 21, and the steel sleeve 25 passes through the holes of the two vertical plates of the lower connecting frame 21 and is welded with the two vertical plates (not marked in the figure). The free end 3 of the piston rod of each hydraulic cylinder 9 is hinged on the lower connecting frame 21, and the bottom end of each hydraulic cylinder 9 is hinged on one pile-embracing arc-shaped clamping arm 7, such as one or two arc-shaped clamping jaws 13 in the middle of the group of arc-shaped clamping jaws 13. The articulation of the hydraulic cylinder 9 and the articulation of the free end 3 of the piston rod can both adopt a structure that two holes of two lug plates are articulated with one hole of a middle connecting plate through an articulation shaft (not marked in the structural diagram). The arc-shaped clamping jaw 13 can be welded with a flat steel plate 27, and the two lug plates are welded on the flat steel plate 27.

The mechanical gripper is also called a mechanical claw or a mechanical hand. The connecting frame 4 is also called a fixing frame. The compression spring 14 is also called a stay spring. The hinge is also called pivot or rotation connection. The hinge shaft 2 is also called a pin shaft.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a machinery that is used for pile foundation construction site precast pile to transport is grabbed which characterized in that: the pile-embracing connecting device comprises a connecting frame detachably connected with a connector of an arm of an excavator, a pair of arc-shaped clamping arms which are hinged on the connecting frame and driven by a hydraulic cylinder and used for embracing piles, reinforcing rods extending out of two sides of the connecting frame are arranged on the connecting frame, and two outer ends of each reinforcing rod are provided with mooring ropes used for fixing precast piles in the transportation process.

2. The mechanical grab for precast pile transportation at a pile foundation construction site as claimed in claim 1, wherein: the anchor rod is parallel with the axis of the precast pile, and the cable is detachably connected with the outer end of the anchor rod.

3. The mechanical grab for precast pile transportation at a pile foundation construction site as claimed in claim 1, wherein: the two ends of the reinforcing rods extending out of the connecting frame are provided with adjusting structures for adjusting the length of the reinforcing rods at each end.

4. The mechanical grab for precast pile transportation at a pile foundation construction site as claimed in claim 1, wherein: each arc-shaped clamping arm is composed of a group of arc-shaped clamping jaws which are arranged in parallel, the top of each arc-shaped clamping arm is hinged to the connecting frame through a hinge shaft, one end of a hydraulic cylinder which drives each arc-shaped clamping arm to open and close is hinged to the arc-shaped clamping jaw in the middle of the group of arc-shaped clamping jaws, and the free end of a piston rod of the hydraulic cylinder is hinged to the connecting frame.

5. The mechanical grab for precast pile transportation at a pile foundation construction site as claimed in claim 4, wherein: an arc arm lock comprises three parallel arrangement's arc clamping jaw, and another arc arm lock comprises four parallel arrangement's arc clamping jaw, and two arc arm locks can interlock each other: three arc-shaped clamping jaws of one arc-shaped clamping arm can be deeply inserted into the gaps between the adjacent arc-shaped clamping jaws of the four arc-shaped clamping jaws of the other arc-shaped clamping arm.

6. The mechanical grab for precast pile transportation at a pile foundation construction site as claimed in claim 5, wherein: the tops of the three arc-shaped clamping jaws are hinged to the connecting frame through a hinge shaft, and one end of the hydraulic cylinder is hinged to one arc-shaped clamping jaw in the middle of the three arc-shaped clamping jaws; the tops of two arc-shaped clamping jaws in the middle of the four arc-shaped clamping jaws are hinged to the connecting frame through a hinge shaft, one end of the hydraulic cylinder is hinged to the two arc-shaped clamping jaws in the middle of the four arc-shaped clamping jaws, and a plurality of connecting rods for connecting the four arc-shaped clamping jaws are arranged at the tops of the four arc-shaped clamping jaws.

7. The mechanical grab for precast pile transportation at a pile foundation construction site as claimed in claim 4, wherein: the inner concave surface of each arc-shaped clamping jaw is connected with a concave arc-shaped steel plate for buffering through a plurality of compression springs.

8. The mechanical grab for precast pile transportation at a pile foundation construction site as claimed in claim 7, wherein: the inner concave surface of the inner concave arc-shaped steel plate is attached with a rubber plate for protection.

9. The mechanical grab for precast pile transportation at a pile foundation construction site as claimed in claim 1, wherein: the connecting frame is divided into an upper connecting frame and a lower connecting frame, and a hydraulic drive turntable is fixedly connected between the upper connecting frame and the lower connecting frame; the upper connecting frame is provided with two lug plates which are symmetrically arranged and are used for being connected with a connector of an arm of the excavator, and each lug plate is provided with two holes for penetrating and connecting bolts; the two arc-shaped clamping arms are hinged on the lower connecting frame; the reinforcing rod is fixedly connected to the lower connecting frame; the free end of the piston rod of each hydraulic cylinder is hinged to the lower connecting frame, and the bottom end of each hydraulic cylinder is hinged to the arc-shaped clamping arm for the pile embracing.