External clamping pile pulling device

Abstract

The invention discloses an external clamping pile pulling device, and belongs to the technical field of pile pulling machines, the external clamping pile pulling device comprises a mounting frame, a pile pulling frame and two clamping assemblies, and the pile pulling frame is arranged on the mounting frame in a lifting manner; the clamping assembly comprises a clamping oil cylinder arranged on the pile pulling frame and a fixing plate arranged at the end of a piston rod of the clamping oil cylinder, a clamping plate is installed on one side of the fixing plate in a sliding mode, and a clamping block used for clamping the guardrail pile is arranged on the clamping plate. And a bottom plate is fixed on the pile pulling frame. The mounting frame abuts against the ground to provide support for lifting of the pile pulling frame, the piston rods of the two clamping oil cylinders extrude the guardrail pile from the two sides of the guardrail pile correspondingly, the guardrail pile is pulled out when the pile pulling frame is lifted, use is convenient and fast, and universality is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile pulling machines, in particular to an external clamping pile pulling device. BACKGROUND

[0002] Guardrail piles are key safety components in highways, urban roads and various traffic facilities. With frequent maintenance and reconstruction of infrastructure, the amount of guardrail pile removal operations continues to increase. Traditional pile pulling machines mainly rely on internal plug-in pile pulling heads or hooks. The internal plug-in structure needs to be inserted into the pile body, which has a narrow application range, is easy to damage the pile body and is complex to operate. The lifting mechanism of the hook is far away from the position of the guardrail pile, and is inclined under stress during pile pulling, so the structure is easy to be damaged, and it often needs to spend more cost to improve the structural strength redundancy.

[0003] Therefore, it is necessary to design an external clamping pile pulling device which is easier to use for pulling out the guardrail pile. SUMMARY

[0004] In view of the above technical deficiencies, the purpose of the present application is to provide an external clamping pile pulling device, which sets up a mounting rack, a pile pulling frame and a clamping assembly. The mounting rack can be close to the ground of the guardrail pile as a support, and the clamping assembly clamps the guardrail pile from the outside of the guardrail pile, thereby improving the stability and convenience during pile pulling.

[0005] To solve the above technical problems, the present application adopts the following technical scheme: the present application provides an external clamping pile pulling device, which comprises: a mounting rack; a pile pulling frame arranged on the mounting rack by a lifting driving mechanism, having a degree of freedom of lifting relative to the mounting rack; two groups of clamping assemblies symmetrically arranged on the pile pulling frame, the clamping assembly comprising a clamping oil cylinder arranged on the pile pulling frame and a fixed plate arranged at the end of the piston rod of the clamping oil cylinder, the fixed plate being slidably installed with a clamping plate on the side away from the clamping oil cylinder, the clamping plate being provided with clamping blocks for clamping the guardrail pile; wherein the pile pulling frame is fixed with a bottom plate, and when the clamping oil cylinders in the two clamping assemblies respectively push the clamping blocks against the guardrail pile, the lifting driving mechanism lifts the pile pulling frame, and the lower end of the clamping plate is abutted against the bottom plate.

[0006] Preferably, the clamping assembly further comprises two positioning plates fixed on the pile pulling frame, the positioning plates are provided with opening grooves, the cylinder wall of the clamping oil cylinder is fixed with two first pin shafts, the two first pin shafts are respectively inserted into the two opening grooves, and the side of the positioning plate is provided with a stop block for limiting the first pin shaft from being separated from the opening groove.

[0007] Preferably, the side of the fixed plate away from the clamping oil cylinder is bolted with two parallel sliding groove blocks, and the two sliding groove blocks cooperate with the fixed plate to form a sliding groove for lifting the clamping plate.

[0008] Preferably, the clamping block is bolted with the clamping plate, and arc-shaped tooth grooves or straight tooth grooves are formed on the clamping block.

[0009] Preferably, the mounting frame comprises a connecting plate, a base and two side plates welded on the connecting plate, the connecting plate and the side plates are welded on the base, two slide groove plates are fixed on the opposite side walls of the two side plates, two slide rail plates are fixed on the pull-out pile frame, and the slide rail plates slide in the slide grooves formed by the slide groove plates.

[0010] Preferably, the pull-out pile frame is slidingly mounted on the mounting frame, and the lifting driving mechanism comprises a lifting oil cylinder, and two ends of the lifting oil cylinder are hingedly connected with the mounting frame and the pull-out pile frame through a second pin shaft and a third pin shaft, respectively.

[0011] Preferably, the two clamping oil cylinders are synchronously driven through a hydraulic synchronous valve, and a tubular bidirectional hydraulic lock is connected to the hydraulic oil inlet and outlet pipeline of the clamping oil cylinder.

[0012] Preferably, the mounting frame comprises a connecting portion and a horizontal supporting portion fixed on the bottom of the connecting portion, the lifting driving mechanism comprises two symmetrically distributed lifting oil cylinders, the two lifting oil cylinders are located on the sides opposite to the two groups of clamping assemblies, respectively, the cylinder body of the lifting oil cylinder is fixed on the horizontal supporting portion, and the piston rod of the lifting oil cylinder is hingedly connected with the pull-out pile frame through a fourth pin shaft.

[0013] Preferably, the pull-out pile frame comprises a U-shaped rear plate and two L-shaped front plates, the two front plates are symmetrically fixed on the rear plate through a plurality of rib plates, and the two groups of clamping assemblies are arranged between the two front plates and the rear plate.

[0014] Preferably, the axes of the two lifting oil cylinders and the clamping oil cylinder are in the same plane.

[0015] The present application has the following beneficial effects: The mounting frame of the present application abuts against the ground to provide support for the lifting of the pull-out pile frame, the piston rods of the two clamping oil cylinders extrude the guardrail pile from the two sides of the guardrail pile, the pushing force is transmitted to the clamping blocks through the fixed plates and the clamping plates, so that the two clamping blocks firmly clamp the guardrail pile; when the lifting driving mechanism lifts the pull-out pile frame, since the clamping plate can slide on the fixed plate, the lower end of the clamping plate abuts against the bottom plate of the pull-out pile frame, and the huge axial tension during the pulling-out of the pile is borne by the hard contact between the clamping plate and the bottom plate, rather than by the piston rod of the clamping oil cylinder. This can effectively protect the clamping oil cylinder and avoid deformation and damage of the piston rod of the clamping oil cylinder due to long-term bearing of huge radial tension, thereby improving the safety and reliability of the whole equipment. Compared with the traditional pile puller, this form of clamping the guardrail pile from the outside and lifting the pile is more convenient to use and has good versatility.

[0016] The two groups of clamping assemblies of the application are symmetrically arranged, and the two clamping oil cylinders are synchronously operated through a hydraulic synchronizing valve, so that the clamping force is uniform and synchronous, and the inclination and bending of the pile body caused by unilateral force of the pile body, unstable clamping or damage to the surface of the pile body are avoided; meanwhile, a tubular bidirectional hydraulic lock is provided, and the hydraulic lock can be automatically locked when power failure or pipeline leakage occurs, so that safety accidents caused by sudden loosening of clamping are prevented.

[0017] The application designs two kinds of lifting driving mechanisms, two kinds of mounting racks and two kinds of pile pulling racks. In the single lifting oil cylinder scheme, the lifting oil cylinder is located between the mounting rack and the two clamping assemblies, the overall structure is compact, and the width of the mechanism is small. In the double lifting oil cylinder scheme, the two lifting oil cylinders are respectively located beside the two groups of clamping assemblies, the pile pulling rack is symmetrically lifted, the overall stress of the pile pulling rack is more balanced, and greater lifting force is provided. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0019] Figure 1 A perspective view of the overall structure of the external clamping pile pulling device is provided for the embodiments of the application.

[0020] Figure 2 A front view of the overall structure of the external clamping pile pulling device is provided for the embodiments of the application.

[0021] Figure 3 A Figure 2 A sectional view at A-A.

[0022] Figure 4 A side view of the overall structure of the external clamping pile pulling device is provided for the embodiments of the application.

[0023] Figure 5 An installation schematic diagram of the clamping oil cylinder in the external clamping pile pulling device is provided for the embodiments of the application.

[0024] Figure 6 A schematic diagram of the external clamping pile pulling device clamping the cylindrical guardrail pile is provided for the embodiments of the application.

[0025] Figure 7 A structure schematic diagram of the arc-shaped tooth groove provided on the clamping block in the external clamping pile pulling device is provided for the embodiments of the application.

[0026] Figure 8 A structure schematic diagram of the straight tooth groove provided on the clamping block in the external clamping pile pulling device is provided for the embodiments of the application.

[0027] Figure 9 This is a perspective view of the overall structure of an external clamping pile extraction device provided in Embodiment 3 of the present invention.

[0028] Figure 10 This is a front view of the overall structure of an external clamping pile extraction device provided in Embodiment 3 of the present invention.

[0029] Figure 11 This is a side view of the overall structure of an external clamping pile extraction device provided in Embodiment 3 of the present invention.

[0030] Explanation of reference numerals in the attached figures: 1. Mounting frame, 2. Pile extraction frame, 3. Lifting drive mechanism, 4. Clamping assembly, 5. Clamping cylinder, 6. Piston rod, 7. Fixing plate, 8. Clamping plate, 9. Clamping block, 10. Base plate, 11. Positioning plate, 12. Opening slot, 13. First pin, 14. Stop block, 15. Sliding block, 16. Arc-shaped toothed groove, 17. Straight toothed groove, 18. Connecting plate, 19. Base, 20. Side plate, 21. Rib plate, 22. Sliding plate, 23. Slide rail plate, 24. Lifting cylinder, 25. Second pin, 26. Hydraulic synchronous valve, 27. Pipe-type bidirectional hydraulic lock, 28. Connecting part, 29. Horizontal support part, 30. Lifting cylinder, 31. Fourth pin, 32. Rear plate, 33. Front plate, 34. Third pin. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1: like Figures 1 to 8 As shown, Embodiment 1 of the present invention provides an external clamping pile extraction device, including a mounting frame 1, a pile extraction frame 2, a lifting drive mechanism 3, and two sets of clamping components 4. The mounting frame 1 is used to connect the follower plate of the pile extraction machine and also serves as the mounting base for this external clamping pile extraction device.

[0033] like Figure 1As shown, the mounting frame 1 includes a connecting plate 18 for connecting the follow-up plate of the puller, a base 19 welded at the bottom of the connecting plate 18, and two side plates 20 welded on the connecting plate 18, which are also welded on the base 19. Meanwhile, a plurality of reinforcing ribs are welded between the two side plates 20 and the connecting plate 18, and a reinforcing structure is also welded at the bottom of the base 19. The base 19 is provided with an opening portion, in which the guardrail pile is placed during use. The opposite side walls of the two side plates 20 are each bolted with two parallel sliding groove plates 22, which cooperate to form a sliding groove. The puller frame 2 is slidingly mounted on the sliding groove.

[0034] The puller frame 2 is slidingly mounted on the mounting frame 1. As shown in Figure 1 and Figure 3 shown, two slide rail plates 23 are symmetrically fixed on the two sides of the puller frame 2, and the sliding groove plates 22 provide precise vertical constraint for the lifting movement of the slide rail plates 23. The two slide rail plates 23 can smoothly slide in the sliding groove formed by the sliding groove plates 22, ensuring that the puller frame 2 moves along the axial direction during the pulling process, reducing the pile jamming or equipment vibration. In order to drive the puller frame 2 to rise and fall on the mounting frame 1, the lifting driving mechanism 3 designed in this embodiment includes a lifting oil cylinder 24, the upper and lower ends of which are respectively connected with the puller frame 2 and the mounting frame 1 through the third pin shaft 34 and the second pin shaft 25. When the lifting oil cylinder 24 extends and retracts, it drives the puller frame 2 to rise and fall on the mounting frame 1.

[0035] The two sets of clamping assemblies 4 are symmetrically arranged on the puller frame 2 and can respectively abut against the guardrail pile from the left and right sides of the guardrail pile. The base 19 of the mounting frame 1 can be placed on the ground, supported by the ground. At this time, the lifting oil cylinder 24 is elongated, which can drive the puller frame 2 to lift the two sets of clamping assemblies 4, and then pull out the guardrail pile from the ground.

[0036] As shown in Figure 3 , Figure 5 and Figure 7 each set of clamping assemblies 4 includes a clamping oil cylinder 5 hinged on the puller frame 2, and a fixed plate 7 bolted on the end of the piston rod 6 of the clamping oil cylinder 5. The clamping oil cylinder 5 is hinged with the puller frame 2 through the first pin shaft 13 fixed at one end of the cylinder wall of the clamping oil cylinder 5 close to the piston rod 6. The side of the fixed plate 7 away from the clamping oil cylinder 5 is slidingly mounted with a clamping plate 8, and the clamping plate 8 is provided with clamping blocks 9 for directly contacting and clamping the guardrail pile. The sliding direction of the clamping plate 8 on the fixed plate 7 is perpendicular to the axial direction of the piston rod 6.

[0037] The puller frame 2 is fixed with a bottom plate 10 below the clamping assembly 4. As shown in Figure 6As shown, when the clamping cylinders 5 of the two sets of clamping assemblies 4 drive the piston rods 6 to extend symmetrically, the piston rods 6 push the fixed plates 7 to drive the clamping plates 8 and the clamping blocks 9 to extrude from both sides of the guardrail post to the center of the guardrail post, so that the clamping blocks 9 firmly abut against the surface of the guardrail post, and then the lifting cylinder 24 drives the post pulling frame 2 to move upward. At this time, since the clamping plate 8 can slide on the fixed plate 7, the lower end of the clamping plate 8 will naturally abut against the bottom plate 10 of the post pulling frame 2. During the post pulling process, the clamping cylinder 5 provides a pushing force towards the guardrail post, and the huge axial pulling force for pulling up the guardrail post is mainly transmitted to the post pulling frame 2 through the hard contact surface between the clamping plate 8 and the bottom plate 10, rather than being borne by the piston rod 6 of the clamping cylinder 5. This design effectively avoids the sealing failure, rod deformation or fatigue damage of the piston rod 6 of the clamping cylinder 5 caused by long-term bearing of huge downward pulling force, thereby significantly improving the service life of the hydraulic elements and the safety of the equipment operation. At the same time, the overall width of the equipment is mainly related to the length of the clamping cylinder 5 and the thickness of the fixed plate 7, the clamping plate 8 and the clamping block 9, without additional space waste, which makes the overall structure of the equipment compact and small.

[0038] Embodiment Two On the basis of Embodiment One, this embodiment further refines the structure of the clamping assembly 4. The clamping block 9 is connected with the clamping plate 8 through bolts, so as to facilitate quick replacement of the clamping block 9 according to different specifications of the guardrail post. The clamping block 9 can be provided with an arc-shaped tooth groove 16 or a straight tooth groove 17. The clamping block 9 with the arc-shaped tooth groove 16 can be fitted with the surface of the cylindrical guardrail post, thereby increasing the contact area. The clamping block 9 with the straight tooth groove 17 is suitable for the square or H-shaped guardrail post, and can significantly increase the clamping ability of the clamping block 9, thereby effectively preventing the clamping block 9 from slipping or the guardrail post from falling off during the post pulling process.

[0039] In order to facilitate disassembly and installation of the clamping cylinder 5, the clamping assembly 4 further comprises two positioning plates 11 welded on the post pulling frame 2, and the clamping cylinder 5 is located between the two positioning plates 11. An opening groove 12 is formed in one end of the positioning plate 11 close to the opening part. Two first pin shafts 13 on the cylinder wall of the clamping cylinder 5 can be respectively inserted into the corresponding opening grooves 12, and one side of the positioning plate 11 is provided with a stop block 14 fixed on the post pulling frame 2 through bolts, which is used to limit the first pin shaft 13 from being separated from the opening groove 12. Through the above positioning structure, the transverse displacement of the clamping cylinder 5 under high load working condition can be effectively constrained, and the deviation of the clamping cylinder 5 during clamping can be prevented.

[0040] The side of the fixed plate 7 away from the clamping cylinder 5 is fixedly connected with two parallel sliding groove blocks 15 through bolts, the cross sections of the two sliding groove blocks 15 are L-shaped, and the sliding groove blocks 15 and the fixed plate 7 cooperate to form a sliding groove for the clamping plate 8 to slide up and down. The clamping plate 8 freely slides in the sliding groove, which not only ensures flexible fitting in the initial clamping stage, but also makes the clamping plate 8 slide down to abut against the bottom plate 10 when the post pulling frame 2 is lifted, thereby realizing smooth switching between hydraulic clamping and mechanical bearing.

[0041] The hydraulic pipes of the two clamping oil cylinders 5 are synchronously driven to stretch and retract by a hydraulic synchronizing valve 26, so as to ensure that the clamping forces on both sides are consistent and synchronous, and to avoid tilting or bending of the guardrail pile due to excessive force on one side. Meanwhile, the hydraulic oil inlet and outlet pipes of the clamping oil cylinder 5 are connected with a tubular bidirectional hydraulic lock 27. The hydraulic lock can automatically lock the oil circuit when the hydraulic system is powered off, the pipes are accidentally leaked or the pressure fluctuates, so as to prevent the guardrail pile from falling due to sudden loosening of the clamping plate 8, and effectively improve the safety protection capability in the operation process.

[0042] Embodiment Three On the basis of Embodiment One and Embodiment Two, Embodiment Three of the present application provides an alternative solution, which changes the forms of the mounting frame 1, the pile pulling frame 2 and the lifting driving mechanism 3, and the rest of the structure is still the same as the above embodiments.

[0043] As shown in Figures 9 to 11 , in the present embodiment, the mounting frame 1 includes a connecting part 28 and a horizontal supporting part 29 welded and fixed at the bottom of the connecting part 28. A plurality of threaded holes are arranged on the connecting part 28, which can be used to fix and connect the excavator. The pile pulling frame 2 includes a U-shaped rear plate 32 and two L-shaped front plates 33, and a plurality of rib plates 21 are welded on the two front plates 33 and fixed on the rear plate 32. The two sets of clamping assemblies 4 are arranged in the space between the two front plates 33 and the rear plate 32.

[0044] The two front plates 33 are symmetrically distributed, and an opening space is left between the two front plates 33 for the guardrail pile to enter. The welding combination of the U-shaped rear plate 32, the L-shaped front plate 33 and the rib plate 21 forms a pile pulling frame 2 with sufficient bending and torsional resistance, which makes the structure of the pile pulling frame 2 deformed very little when bearing the pile pulling force, and ensures the stability of the relative position of the clamping assembly 4.

[0045] As shown in Figure 9 and Figure 10 , the lifting driving mechanism 3 adopts two symmetrically distributed lifting oil cylinders 30, which are respectively located on the sides away from the two sets of clamping assemblies 4. The cylinder body of the lifting oil cylinder 30 is fixed on the horizontal supporting part 29 by bolts, and the end of the piston rod 6 of the lifting oil cylinder 30 is hingedly connected with the pile pulling frame 2 through the fourth pin shaft 31. The axes of the two lifting oil cylinders 30 are parallel. The two lifting oil cylinders 30 are synchronously lifted by the hydraulic synchronizing valve 26. The symmetrical arrangement of the two lifting oil cylinders 30 makes the axis of the guardrail pile located in the middle of the axes of the two lifting oil cylinders 30, and the pile pulling frame 2 is more balanced in the lifting process, and the two lifting oil cylinders 30 can also provide greater overall lifting force, which is particularly suitable for the pile pulling operation of the guardrail pile with large diameter and deep burial depth, effectively reduces the tilting or shaking caused by unilateral force, and improves the stability of the pile pulling process.

[0046] The axes of the two lifting oil cylinders 30 are also in the same plane as the axes of the two clamping oil cylinders 5. This coplanar arrangement makes the overall force system of the device symmetrically balanced, avoids additional bending moments and stress concentrations due to force arm deviation, and further improves the stability and service life of the structure.

[0047] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application cover the modifications and changes as long as they come within the scope of the appended claims and their equivalents.

Claims

1. An outside clamp for a pull-out pile, characterized in that, The utility model relates to a guardrail post pulling frame, which comprises the following components: a mounting frame; a pulling frame arranged on the mounting frame through a lifting driving mechanism and having a lifting degree relative to the mounting frame; two sets of clamping assemblies symmetrically arranged on the pulling frame, each clamping assembly comprising a clamping cylinder arranged on the pulling frame and a fixing plate arranged at the end of the piston rod of the clamping cylinder, the fixing plate being slidably mounted with a clamping plate on the side away from the clamping cylinder, the clamping plate being provided with clamping blocks for clamping the guardrail post; wherein the pulling frame is fixed with a bottom plate, and when the clamping cylinders of the two clamping assemblies respectively push the clamping blocks against the guardrail post, the lifting driving mechanism lifts the pulling frame, and the lower end of the clamping plate is abutted against the bottom plate.

2. An external clamp draw pile device as defined in claim 1, wherein, The clamping assembly further comprises two positioning plates fixed on the pulling frame, the positioning plates being provided with open grooves, the cylinder wall of the clamping cylinder being fixed with two first pin shafts, the two first pin shafts being respectively inserted into the two open grooves, and the side of the positioning plate being provided with a stop block for limiting the first pin shaft from being disengaged from the open groove.

3. An external clamp draw pile apparatus as defined in claim 1, wherein, The side of the fixing plate away from the clamping cylinder is bolted with two parallel sliding groove blocks, and the two sliding groove blocks and the fixing plate cooperate to form a sliding groove for lifting the clamping plate.

4. An external clamp draw pile apparatus as defined in claim 1, wherein, The clamping blocks are bolted with the clamping plate, and the clamping blocks are provided with arc-shaped tooth grooves or straight tooth grooves.

5. An external clamp draw pile apparatus as defined in claim 1, wherein, The mounting frame comprises a connecting plate, a base and two side plates welded on the connecting plate, the connecting plate and the side plates are both welded on the base, the opposite side walls of the two side plates are both fixed with two sliding groove plates, the pulling frame is fixed with two sliding rail plates, and the sliding rail plates slide in the sliding grooves formed by the sliding groove plates.

6. An external clamp draw pile device as defined in claim 5, wherein, The pulling frame is slidably mounted on the mounting frame, the lifting driving mechanism comprises a lifting cylinder, and the two ends of the lifting cylinder are respectively hinged to the mounting frame and the pulling frame through second pin shafts and third pin shafts.

7. An external clamp draw pile apparatus as defined in claim 1, wherein, The two clamping cylinders are synchronously driven through a hydraulic synchronizing valve, and the hydraulic oil inlet and outlet pipeline of the clamping cylinder is connected with a tubular bidirectional hydraulic lock.

8. An external clamp draw pile apparatus as defined in claim 1, wherein, The mounting frame comprises a connecting portion and a transverse supporting portion fixed at the bottom of the connecting portion, the lifting driving mechanism comprises two symmetrically distributed lifting cylinders, the two lifting cylinders are respectively located on the side opposite to the two sets of clamping assemblies, the cylinder body of the lifting cylinder is fixed on the transverse supporting portion, and the piston rod of the lifting cylinder is hinged to the pulling frame through a fourth pin shaft.

9. An external clamp draw pile apparatus as defined in claim 8, wherein, The pulling frame comprises a rear plate in the shape of U and two front plates in the shape of L, the two front plates are symmetrically fixed on the rear plate through a plurality of rib plates, and the two sets of clamping assemblies are respectively arranged between the two front plates and the rear plate.

10. An external clamp draw pile apparatus as defined in claim 8, wherein, The axes of the two lifting cylinders and the clamping cylinders are in the same plane.

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