Hydraulic pile cutting device with adjustable radius

Abstract

This invention discloses an adjustable-radius ring-type hydraulic pile-cutting device, comprising a hydraulic cylinder support, a pile-cutting hydraulic cylinder, a pile-cutting steel rod, a rotary power hydraulic cylinder, and a rotating arm. The cylinder support includes an upper and lower annular plate, each with several sets of sliding grooves. Each set of grooves corresponds to a central axis of rotation and a hinge node. Each set of grooves corresponds to a pile-cutting hydraulic cylinder and a pile-cutting steel rod. The extension and retraction operations of the rotary power hydraulic cylinder drive the rotating arm to rotate around the central axis of rotation, causing the pile-cutting hydraulic cylinder to move towards or away from the center of the hydraulic cylinder support. The outer positioning shaft of the pile-cutting hydraulic cylinder slides within the sliding grooves, thereby adjusting the pile-cutting radius of the pile-cutting steel rod. This allows the pile-cutting device to be applied to pile heads of different diameters, improving its adaptability and construction efficiency.

Description

Technical Field

[0001] This invention relates to a ring-type hydraulic pile cutting device with adjustable radius, belonging to the field of building construction technology. Background Technology

[0002] Cast-in-place concrete pile foundations are a conventional form of foundation reinforcement. To ensure the quality of the pile foundations and their effective connection with other superstructures, it is usually required that the piles be over-poured to a certain height during construction, such as 0.5 to 1 meter. Before constructing other superstructures, the pile head (i.e., the over-poured concrete portion) needs to be removed or cut off. Traditional pile head removal methods typically involve manual removal using tools such as pneumatic picks, followed by hoisting away the pile head with a crane. This method has many drawbacks, including high labor and machinery costs, significant construction safety risks, and low levels of mechanization.

[0003] Currently, some companies have developed simple modular hydraulic pile cutting devices. However, since the pile cutting radius cannot be changed after assembly, they cannot directly handle concrete cast-in-place piles of different diameters at the construction site, which presents significant limitations. Summary of the Invention

[0004] To address the problem of poor adaptability in existing hydraulic pile cutting devices where the pile cutting radius cannot be changed after assembly, this invention provides a ring-type hydraulic pile cutting device with an adjustable radius, which can adjust the pile cutting radius as needed, thereby improving the adaptability of the hydraulic pile cutting device.

[0005] To solve the above technical problems, the present invention includes the following technical solutions:

[0006] An adjustable radius ring-type hydraulic pile cutting device includes a hydraulic cylinder support, a pile cutting hydraulic cylinder, a pile cutting steel rod, a rotary power hydraulic cylinder, and a rotating arm.

[0007] The cylinder support includes an annular upper ring plate and a lower ring plate. Several sets of sliding grooves are correspondingly provided on the upper ring plate and the lower ring plate. The first end of the sliding groove is close to the outer diameter edge of the annulus, and the second end of the sliding groove is close to the inner diameter edge of the annulus. The center line of the sliding groove is a curve, and the radius of curvature of the center line of the sliding groove gradually increases from the first end to the second end. Each set of sliding grooves is correspondingly provided with a rotation center shaft and a hinge node.

[0008] Each set of chutes is equipped with a pile-cutting hydraulic cylinder and a pile-cutting steel chisel. The outer wall of the pile-cutting hydraulic cylinder is equipped with an outer positioning shaft and an inner positioning shaft. The outer positioning shaft is set in the chutes and can slide along the chutes. Each pile-cutting hydraulic cylinder is equipped with a pile-cutting steel chisel at its end. One end of the pile-cutting steel chisel is a pointed tip, and the other end is fixedly connected to the end of the telescopic rod of the pile-cutting hydraulic cylinder.

[0009] The middle part of the rotating arm is pinned to the rotation center shaft, one end of the rotating arm is pinned to the inner positioning shaft, the other end is pinned to one end of the rotating power hydraulic cylinder, and the other end of the rotating power hydraulic cylinder is pinned to the hinge node.

[0010] The rotary hydraulic cylinder's extension and retraction operations can drive the rotating arm to rotate around the rotation center axis, causing the pile-cutting hydraulic cylinder to move toward or away from the center of the hydraulic cylinder support. The outer positioning shaft of the pile-cutting hydraulic cylinder slides in the slide groove, thereby adjusting the pile-cutting radius of the pile-cutting steel rod.

[0011] Furthermore, the width of the groove is matched with the diameter of the outer positioning shaft of the pile cutting hydraulic cylinder, and a rolling bearing is sleeved on the outer positioning shaft.

[0012] Furthermore, the rotary power hydraulic cylinder includes a first ear plate at one end, a telescopic rod at the other end, and a second ear plate at the telescopic end of the telescopic rod. Both the first and second ear plates are provided with pin holes, and the first ear plate is pin-connected to the hinge node on the hydraulic cylinder support.

[0013] One end of the rotating arm is provided with a pin, and the other end is provided with a first positioning shaft hole. The pin is hinged to the second ear plate of the rotating power hydraulic cylinder. The first positioning shaft hole is pinned to the inner positioning shaft of the pile cutting hydraulic cylinder. A second positioning shaft hole is provided between the pin and the first positioning shaft hole. The second positioning shaft hole is pinned to the rotation center shaft of the hydraulic cylinder support.

[0014] Furthermore, with the center of the hydraulic cylinder support as the center O and the direction from the origin to point A as the positive x-axis, a two-dimensional coordinate system xOy is established in the plane containing the upper surface of the upper ring plate of the hydraulic cylinder support. The centerline of the slide groove needs to satisfy the following conditions:

[0015]

[0016] Wherein, the hinge node is denoted as A, the center point of the inner positioning axis is denoted as B, the center point of the outer positioning axis is denoted as C, the distance between points A and B is denoted as r, the distance between points B and C is denoted as l, and the distance between point O and point A is denoted as l. OA θ is the angle between the rotating arm of the pile cutting hydraulic cylinder and the negative x-axis, and θ0 is the set value.

[0017] Furthermore, if the pile cutting radius R0 is expressed as a function of θ, then:

[0018]

[0019] In the formula, d0 is the distance from the tip of the pile cutting steel rod to the inner positioning shaft when the pile cutting hydraulic cylinder is fully retracted.

[0020] The present invention, by adopting the above technical solution, has the following advantages and positive effects compared with the prior art: The present invention provides a ring-type hydraulic pile cutting device with adjustable radius. By setting a sliding groove on the hydraulic cylinder support, the outer positioning shaft of the pile cutting hydraulic cylinder is placed in the sliding groove. By rotating the hydraulic cylinder to extend or retract, the rotating arm is driven to rotate, thereby causing the pile cutting hydraulic cylinder to move towards or away from the center of the hydraulic cylinder support, thereby adjusting the pile cutting radius of the pile cutting steel rod. This allows the pile cutting device to adapt to a larger range of pile diameters and improves the versatility of the pile cutting device. Attached Figure Description

[0021] Figure 1 This is a perspective view of an adjustable-radius ring-type hydraulic pile-cutting device according to an embodiment of the present invention;

[0022] Figure 2 This is a top view of an adjustable-radius ring-type hydraulic pile-cutting device according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the upper ring plate provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the hydraulic cylinder for pile cutting and the pile cutting steel rod provided in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of a rotary power hydraulic cylinder provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of a rotating arm provided in an embodiment of the present invention;

[0027] Figure 7 A schematic diagram of a two-dimensional coordinate system for an adjustable-radius ring-type hydraulic pile-cutting device according to an embodiment of the present invention;

[0028] Figure 8 This is a mathematical model of the movement of the hydraulic cylinder for pile cutting, provided in one embodiment of the present invention.

[0029] The numbers in the diagram are as follows:

[0030] 10-Hydraulic cylinder support; 11-Upper ring plate; 12-Lower ring plate; 13-Slide groove; 14-Rotation center shaft; 15-Hinged joint;

[0031] 20 - Hydraulic cylinder for pile cutting; 21 - External positioning shaft; 22 - Internal positioning shaft;

[0032] 30 - Pile cutting steel rod;

[0033] 40 - Rotary hydraulic cylinder; 41 - First lug plate; 42 - Telescopic rod; 43 - Second lug plate;

[0034] 50 - Rotary arm; 51 - Pin; 52 - First positioning shaft hole; 53 - Second positioning shaft hole. Detailed Implementation

[0035] The adjustable-radius ring-type hydraulic pile-cutting device provided by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0036] Example 1

[0037] like Figure 1 and Figure 2 As shown, the adjustable radius ring-type hydraulic pile cutting device provided in this embodiment includes a hydraulic cylinder support 10, a pile cutting hydraulic cylinder 20, a pile cutting steel rod 30, a rotary power hydraulic cylinder 40, and a rotating arm 50.

[0038] Combination Figures 1 to 3 As shown, the hydraulic cylinder support 10 includes an upper ring plate 11 and a lower ring plate 12 spaced apart vertically. N sets of sliding grooves 13 are correspondingly provided on the upper ring plate 11 and the lower ring plate 12. The centers of the upper ring plate 11 and the lower ring plate 12 are taken as the centers of rotational symmetry, where N = 12. Then the rotation center angle is... After each set of slide grooves 13 rotates by the rotation center angle, the original position of the next set of slide grooves 13 before rotation will coincide with the original position of the next set of slide grooves 13. Both the upper ring plate 11 and the lower ring plate 12 are annular. The first end of the slide groove 13 is close to the outer diameter edge of the annulus, and the second end of the slide groove 13 is close to the inner diameter edge of the annulus. The centerline of the slide groove 13 is a curve, and the radius of curvature of the centerline of the slide groove 13 gradually increases from the first end to the second end. Each set of slide grooves 13 is provided with a rotation center shaft 14 and a hinge node 15. The rotation center shaft 14 and the hinge node 15 are located near the inner diameter of the upper ring plate 11 and the lower ring plate 12. The rotation center shaft 14 is used to install the rotating arm 50, and the hinge node 15 is used to install the rotary power hydraulic cylinder 40.

[0039] Combination Figures 1 to 4As shown, each slide groove 13 is equipped with a corresponding pile-cutting hydraulic cylinder 20 and a pile-cutting steel rod 30. The outer wall of the pile-cutting hydraulic cylinder 20 is provided with an outer positioning shaft 21 and an inner positioning shaft 22. The outer positioning shaft 21 is located in the slide groove 13 and can slide along the slide groove 13. Each pile-cutting hydraulic cylinder 20 has a pile-cutting steel rod 30 at its end. One end of the pile-cutting steel rod 30 is a pointed tip, and the other end is fixedly connected to the end of the telescopic rod 42 of the pile-cutting hydraulic cylinder 20. The extension operation of the pile-cutting hydraulic cylinder 20 allows the pointed tip of the pile-cutting steel rod to move towards the center of the hydraulic cylinder support, and the retraction operation of the pile-cutting hydraulic cylinder 20 allows the pointed tip of the pile-cutting steel rod to move away from the center of the hydraulic cylinder support.

[0040] Combination Figures 1 to 6 As shown, the rotary hydraulic cylinder 40 includes a first lug 41 at one end, a telescopic rod 42 at the other end, and a second lug 43 at the telescopic end of the telescopic rod 42. Both the first lug 41 and the second lug 43 have pin holes. The first lug 41 is pin-connected to the hinge node 15 on the hydraulic cylinder support 10. The rotating arm 50 has a pin 51 at one end and a first positioning shaft hole 52 at the other end. The pin 51 is hinged to the second lug 43 of the rotary hydraulic cylinder 40. The first positioning shaft hole is hinged to the inner positioning shaft 22 of the pile-cutting hydraulic cylinder 20. A second positioning shaft hole 53 is provided between the pin and the first positioning shaft hole, and the second positioning shaft hole 53 is hinged to the rotation center axis 14 of the hydraulic cylinder support 10. The extension and retraction operations of the rotary hydraulic cylinder 40 can drive the rotating arm to rotate around the rotation center axis 14.

[0041] The principle of adjusting the pile cutting radius of the adjustable ring-type hydraulic pile cutting device provided in this embodiment is as follows: The extended cylinder operation of the rotary power hydraulic cylinder 40 pushes the pin of the rotary arm 50, causing the rotary arm 50 to rotate counterclockwise around the rotation center axis 14, causing the pile cutting hydraulic cylinder 20 to rotate around the center of the hydraulic cylinder support 10 and move towards the center of the hydraulic cylinder support 10. The outer positioning shaft 21 of the pile cutting hydraulic cylinder 20 slides from the first end to the second end in the slide groove 13, and the pile cutting radius of the pile cutting steel rod 30 gradually decreases. The retracted cylinder operation of the rotary power hydraulic cylinder 40 can pull the pin of the rotary arm 50, causing the rotary arm 50 to rotate clockwise around the rotation center axis 14, causing the pile cutting hydraulic cylinder 20 to rotate around the center of the hydraulic cylinder support 10 and move away from the center of the hydraulic cylinder support 10. The outer positioning shaft 21 of the pile cutting hydraulic cylinder 20 slides from the second end to the first end in the slide groove 13, and the pile cutting radius of the pile cutting steel rod 30 gradually increases. The so-called pile cutting radius of the pile cutting steel rod 30 refers to the distance from the tip of the pile cutting steel rod 30 to the center of the hydraulic cylinder support 10 when the pile cutting hydraulic cylinder 20 is in the retracted state.

[0042] Traditional pile-cutting devices cannot adjust the position of their hydraulic cylinders; they can only move the pile-cutting steel rod via the hydraulic cylinder to cut the pile. Due to the limitation of the extension and retraction stroke of the hydraulic cylinder 20, traditional pile-cutting devices have poor versatility, often requiring different devices for different pile diameters. The adjustable-radius ring-type hydraulic pile-cutting device provided in this embodiment uses a groove 13 on the hydraulic cylinder support 10. The outer positioning shaft 21 of the pile-cutting hydraulic cylinder 20 is positioned within the groove 13. The rotation of the hydraulic cylinder 40, through extension or retraction, drives the rotating arm 50 to rotate, thereby moving the hydraulic cylinder toward or away from the center of the hydraulic cylinder support 10. This adjusts the pile-cutting radius of the pile-cutting steel rod 30, allowing the device to adapt to a wider range of pile diameters and improving its versatility.

[0043] In one specific embodiment, the width of the groove 13 matches the diameter of the outer positioning shaft 21 of the pile cutting hydraulic cylinder 20. To facilitate the sliding of the outer positioning shaft 21 within the groove 13, a rolling bearing can be fitted onto the outer positioning shaft 21. This arrangement reduces sliding resistance and improves the smoothness of the outer positioning shaft's movement.

[0044] In one specific embodiment, after the outer positioning shaft 21 stops sliding, a positioning element is provided on the outer positioning shaft 21 to fix the outer positioning shaft 21 in the slide groove 13. For example, the positioning element can be a nut sleeved on the positioning shaft and threadedly connected to the positioning shaft. This arrangement allows the pile cutting hydraulic cylinder to be fixed on the hydraulic cylinder support, and the pile cutting hydraulic cylinder can provide a reliable reaction force during the pile cutting process.

[0045] In one specific embodiment, the inner positioning shaft 22 of the pile-cutting hydraulic cylinder 20 rotates towards or away from the center of the hydraulic cylinder support 10 as the rotary power hydraulic cylinder 40 extends or retracts, and the outer positioning shaft 21 slides accordingly within the slide groove 13. To ensure that the tip of the pile-cutting steel rod 30 always points towards the center of the hydraulic cylinder support 10, combined with... Figures 1 to 8 As shown, with the center of the hydraulic cylinder support 10 as the center O, and the direction from the origin to the rotation center A of the pile-cutting hydraulic cylinder 20 as the positive x-axis, a two-dimensional coordinate system xOy is established in the plane containing the upper surface of the upper ring plate 11 of the hydraulic cylinder support 10. The centerline of the slide groove 13 needs to satisfy the following conditions:

[0046]

[0047] In this diagram, hinge node 15 is denoted as A, the center point of the inner positioning axis 22 is denoted as B, the center point of the outer positioning axis 21 is denoted as C, the distance between points A and B is denoted as r, the distance between points B and C is denoted as l, and the distance between point O and point A is denoted as l. OA θ is the angle between the rotating arm 50 of the pile cutting hydraulic cylinder 20 and the negative x-axis, and θ0 is the set value.

[0048] The proof of formula (1) is as follows:

[0049] The equation for the trajectory B(x0,y0) of the end of the rotating arm 50 of the hydraulic cylinder 20 for pile cutting is:

[0050] (x0-l OA ) 2 +y0 2 =r 2 (2)

[0051] If the angle between the rotating arm 50 of the hydraulic cylinder 20 for pile cutting and the negative x-axis is θ, then the trajectory equation of B(x0,y0) can be written as a parametric equation:

[0052]

[0053] To ensure that the hydraulic cylinder 20 for pile cutting points axially towards the center of the concrete pile, the central section of the hydraulic cylinder 20 is designed to always pass through the origin O. Therefore, points O, B, and C are collinear. The equation of the locus of point C(x,y) is:

[0054]

[0055] Since point C is the center of the outer positioning axis 21 of the hydraulic cylinder 20 for pile cutting, in order to ensure the uniqueness of the trajectory, we have x - x0 > 0.

[0056] make Substituting this into formula (4), we get:

[0057]

[0058] Substituting formula (3) into formula (5) yields the following:

[0059]

[0060] Formula (1) can be obtained from formula (6).

[0061] In one specific embodiment, the pile cutting radius R0 can be expressed as a function of θ, then:

[0062]

[0063] In the formula, d0 is the distance from the tip of the pile cutting steel rod 30 to the inner positioning shaft 22 when the pile cutting hydraulic cylinder 20 is fully retracted and the pile cutting steel rod 30 is at its minimum stroke.

[0064] The proof of formula (7) is as follows:

[0065] Since the central axis of the hydraulic cylinder 20 for pile cutting and the steel chisel always passes through the center point of the disc, therefore:

[0066] R0 = l OB -d0; (8)

[0067] From the meaning of d0, it can be seen that the distance from the tip of the pile cutting steel rod 30 to the inner positioning shaft 22 is a constant value after processing; from the trajectory equation of B(x0,y0) in formula (2), the distance l between the origin O and point B can be obtained. OB for:

[0068]

[0069] Substituting equation (9) into equation (8) yields equation (7).

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A ring-type hydraulic pile-cutting device with adjustable radius, characterized in that, Includes hydraulic cylinder support, pile cutting hydraulic cylinder, pile cutting steel rod, rotary power hydraulic cylinder and rotary arm; The hydraulic cylinder support includes an annular upper ring plate and a lower ring plate. Several sets of sliding grooves are correspondingly provided on the upper and lower ring plates. The first end of the sliding groove is close to the outer diameter edge of the annulus, and the second end of the sliding groove is close to the inner diameter edge of the annulus. The center line of the sliding groove is a curve, and the radius of curvature of the center line of the sliding groove gradually increases from the first end to the second end. Each set of sliding grooves is correspondingly provided with a rotation center shaft and a hinge node. Each set of chutes is equipped with a pile-cutting hydraulic cylinder and a pile-cutting steel chisel. The outer wall of the pile-cutting hydraulic cylinder is equipped with an outer positioning shaft and an inner positioning shaft. The outer positioning shaft is set in the chutes and can slide along the chutes. Each pile-cutting hydraulic cylinder is equipped with a pile-cutting steel chisel at its end. One end of the pile-cutting steel chisel is a pointed tip, and the other end is fixedly connected to the end of the telescopic rod of the pile-cutting hydraulic cylinder. The middle part of the rotating arm is pinned to the rotation center shaft, one end of the rotating arm is pinned to the inner positioning shaft, the other end is pinned to one end of the rotating power hydraulic cylinder, and the other end of the rotating power hydraulic cylinder is pinned to the hinge node. The rotary hydraulic cylinder's extension and retraction operations can drive the rotating arm to rotate around the rotation center axis, causing the pile-cutting hydraulic cylinder to move toward or away from the center of the hydraulic cylinder support. The outer positioning shaft of the pile-cutting hydraulic cylinder slides in the slide groove, thereby adjusting the pile-cutting radius of the pile-cutting steel rod.

2. The adjustable-radius ring-type hydraulic pile-cutting device as described in claim 1, characterized in that, The width of the groove is matched with the diameter of the outer positioning shaft of the pile cutting hydraulic cylinder, and a rolling bearing is fitted on the outer positioning shaft.

3. The adjustable-radius ring-type hydraulic pile-cutting device as described in claim 1, characterized in that, The rotary power hydraulic cylinder includes a first lug plate at one end, a telescopic rod at the other end, and a second lug plate at the telescopic end of the telescopic rod. Both the first and second lug plates are provided with pin holes, and the first lug plate is pin-connected to the hinge node on the hydraulic cylinder support. One end of the rotating arm is provided with a pin, and the other end is provided with a first positioning shaft hole. The pin is hinged to the second ear plate of the rotating power hydraulic cylinder. The first positioning shaft hole is pinned to the inner positioning shaft of the pile cutting hydraulic cylinder. A second positioning shaft hole is provided between the pin and the first positioning shaft hole. The second positioning shaft hole is pinned to the rotation center shaft of the hydraulic cylinder support.

4. The adjustable-radius ring-type hydraulic pile-cutting device as described in claim 1, characterized in that, With the center of the hydraulic cylinder support as the origin O, and the direction from the origin to point A as... x Establish a two-dimensional coordinate system in the plane containing the upper surface of the upper ring plate of the hydraulic cylinder support along the positive axis. x O y The centerline of the chute needs to meet the following conditions: ，（1） Wherein, the hinge node is denoted as A, the center point of the inner positioning axis is denoted as B, the center point of the outer positioning axis is denoted as C, and the distance between points A and B is denoted as . r The distance between point B and point C is denoted as . l The distance between point O and point A is denoted as . l OA , θ For the hydraulic cylinder rotating arm of pile cutting and x The angle in the negative direction of the axis, θ 0 Setting value.

5. The adjustable-radius ring-type hydraulic pile-cutting device as described in claim 4, characterized in that, Pile cutting radius R 0 represents θ Given the functional relationship, then: ， （2） In the formula, The distance from the tip of the pile-cutting steel rod to the inner positioning shaft when the hydraulic cylinder for pile cutting is fully retracted.

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