Design method of adjustable radius ring type hydraulic pile cutting device

Abstract

The application discloses a design method of a radius-adjustable ring type hydraulic pile cutting device, and the radius-adjustable ring type hydraulic pile cutting device designed by adopting the design method is provided with a plurality of groups of sliding grooves on a hydraulic cylinder support, each group of sliding grooves is provided with a pile cutting hydraulic cylinder, a pile cutting steel drill, a rotating power hydraulic cylinder and a rotating arm correspondingly, the rotating power hydraulic cylinder can drive the rotating arm to rotate, and then drives the pile cutting hydraulic cylinder to be close to or far away from the center of the hydraulic cylinder support, in the process, the outer positioning shaft of the pile cutting hydraulic cylinder slides along the sliding groove, so that the pile cutting radius of the pile cutting steel drill is adjusted, the pile cutting device can adapt to a larger range of pile diameters, and the universality of the pile cutting device is improved. Moreover, in the sliding process of the outer positioning shaft along the sliding groove, the pile cutting steel drill always points to the center of the hydraulic cylinder support, which is helpful for the hydraulic cylinder to push the pile cutting steel drill to cut off the pile head.

Description

Technical Field

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

[0002] Currently, cast-in-place concrete piles are commonly used to reinforce foundations. During the construction of cast-in-place concrete piles, to ensure effective connection between the piles and other superstructures, it is often necessary to over-pour a certain height. Before constructing the superstructures, the pile head is chiseled or cut off; the pile head is the over-poured portion of the pile foundation concrete. Traditionally, pile head removal is done manually using tools such as hand-held pneumatic picks, followed by hoisting the pile head away with a crane. This method has many drawbacks, including high labor and machinery costs, significant construction safety risks, and low levels of mechanization.

[0003] Hydraulic pile cutting devices have emerged. During construction, a crane is used to mount the hydraulic pile cutting device onto the pile body, and a hydraulic cylinder pushes the pile cutting steel rod to cut off the pile head. However, since the pile cutting radius cannot be changed after assembly, it cannot directly handle concrete cast-in-place piles of different diameters on the construction site, which has 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 design method for an adjustable-radius ring-type hydraulic pile cutting device. The adjustable-radius ring-type hydraulic pile cutting device designed using this method can adjust the pile cutting radius as needed, thus 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] A design method for a radius-adjustable 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 annular upper ring plate and a lower ring plate, with several sets of sliding grooves correspondingly arranged on the upper and lower ring plates, each set of sliding grooves corresponding to a rotation center shaft and a hinge node; each set of sliding grooves corresponding to a pile cutting hydraulic cylinder and a pile cutting steel rod, the outer wall of the pile cutting hydraulic cylinder being provided with an outer positioning shaft and an inner positioning shaft; the outer positioning shaft is disposed in the sliding groove and can slide along the sliding groove; each pile cutting hydraulic cylinder has a pile cutting steel rod at its end, one end of the pile cutting steel rod being a pointed tip, and the other end being 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 rotary power hydraulic cylinder, and the other end of the rotary power hydraulic cylinder is pinned to the hinge node;

[0007] The design method includes the following steps:

[0008] Step 1: Determine the adjustment range of the pile cutting radius R0 of the adjustable ring-type hydraulic pile cutting device [R] 0min ,R 0max ];

[0009] Step 2: Determine the center distance l between the inner and outer positioning shafts of the pile-cutting hydraulic cylinder. Hydraulic cylinder for pile cutting The distance d0 from the tip of the pile cutting rod to the inner positioning axis when fully retracted. And the inner diameter R1 and outer diameter R2 of the upper and lower ring plates of the hydraulic cylinder support, where R 0max +d0<R1<R 0mi +d 0n +l,R2>R 0max +d0+l;

[0010] Step 3: Determine the position of the rotation center A of the hydraulic cylinder rotating arm for pile cutting, and the distance l from point A to the center O of the annular disk. OA Satisfying R1≤l OA ≤R2;

[0011] Step 4: Determine the number N of circumferentially distributed hydraulic cylinders for pile cutting;

[0012] Step 5: Determine the length of the rotating arm of the pile-cutting hydraulic cylinder;

[0013] Step 6: Determine the center line of the chute. 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, establish a two-dimensional coordinate system xOy in the plane containing the upper surface of the upper ring plate of the hydraulic cylinder support. Determine the equation of the center line of the chute according to formula (1).

[0014]

[0015] 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.

[0016] Furthermore, if the pile cutting radius R0 is expressed as a function of θ, then:

[0017]

[0018] 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.

[0019] 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 design method for a ring-type hydraulic pile cutting device with adjustable radius. The designed ring-type hydraulic pile cutting device can drive the rotating arm to rotate through a rotary power hydraulic cylinder, thereby driving the pile cutting hydraulic cylinder toward or away from the center of the hydraulic cylinder support. During this process, the outer positioning shaft slides along the slide groove, thereby adjusting the pile cutting radius of the pile cutting rod, so that the pile cutting device can adapt to a large range of pile diameters and improve the versatility of the pile cutting device. Moreover, during the process of the outer positioning shaft sliding along the slide groove, the pile cutting rod always points to the center of the hydraulic cylinder support, which helps the hydraulic cylinder push the pile cutting rod to cut off the pile head. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the design method of an adjustable-radius ring-type hydraulic pile-cutting device according to an embodiment of the present invention.

[0021] Figure 2 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 3 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 4 This is a schematic diagram of the upper ring plate provided in an embodiment of the present invention;

[0024] Figure 5 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 6 This is a schematic diagram of the structure of a rotary power hydraulic cylinder provided in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of a rotating arm provided in an embodiment of the present invention;

[0027] Figure 8 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 9 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 design method of 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] like Figure 1 As shown, this embodiment provides a design method for a ring-type hydraulic pile-cutting device with an adjustable radius, combined with... Figures 1 to 7 As shown, the adjustable-radius ring-type hydraulic pile-cutting device 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. The hydraulic cylinder support 10 includes an upper ring plate 11 and a lower ring plate 12 spaced apart vertically. Twelve 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. For example, when N = 12, the rotation center angle is... Rotational symmetry means that after each set of slide grooves 13 rotates about 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 before rotation. Both the upper ring plate 11 and the lower ring plate 12 are annular. The centerline of the slide groove 13 is a curve, with the radius of curvature of the centerline of the slide groove 13 gradually increasing from the first end to the second end. The first end of the slide groove 13 refers to the end near the outer diameter edge of the annulus, and the second end of the slide groove 13 refers to the end near the inner diameter edge of the annulus. Each set of slide grooves 13 corresponds to a rotation center shaft 14 for mounting the rotating arm 50 and a hinge node 15 for mounting the rotating power hydraulic cylinder 40. 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. Each slide groove 13 corresponds to a pile-cutting hydraulic cylinder 20 and a pile-cutting steel chisel 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 disposed in the slide groove 13 and can slide along the slide groove 13. Each pile-cutting hydraulic cylinder 20 is provided with 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 can move the pointed tip of the pile-cutting steel rod towards the center of the hydraulic cylinder support, and the retraction operation of the pile-cutting hydraulic cylinder 20 can move the pointed tip of the pile-cutting steel rod away from the center of the hydraulic cylinder support.

[0037] The design method includes the following steps:

[0038] Step 1: Determine the adjustment range of the pile cutting radius R0 of the adjustable ring-type hydraulic pile cutting device [R] 0min ,R 0max ].

[0039] Step 2: Determine the center distance l between the inner positioning shaft 22 and the outer positioning shaft 21 of the pile cutting hydraulic cylinder 20. Pile cutting fluid When the hydraulic cylinder 20 is fully retracted, the distance d0 from the tip of the pile cutting steel rod 30 to the inner positioning shaft 22 is... And the inner diameter R1 and outer diameter R2 of the upper ring plate 11 and lower ring plate 12 of the hydraulic cylinder support 10, wherein R 0max +d0<R1<R 0mi +d 0n +l,R2>R 0max +d0+l.

[0040] Step 3: Determine the position of the rotation center A of the rotating arm 50 of the pile cutting hydraulic cylinder 20: the distance l from point A to the center O of the annular disk. OA Satisfying R1≤l OA ≤R2, to ensure that the center of rotation is on the annular disk and receives support.

[0041] Step 4: Determine the number N of the circumferentially distributed hydraulic cylinders 20 for pile cutting. This can be determined through mechanical analysis or testing, taking into account factors such as the diameter of the concrete cast-in-place pile, the concrete grade, and the diameter and strength of the pile cutting steel rod 30.

[0042] Step 5: The length r of the rotating arm 50 of the pile-cutting hydraulic cylinder 20, and the adjacent rotation angles of the circumferentially distributed pile-cutting hydraulic cylinders 20 are... Considering that the rotation space of the hydraulic cylinder 20 rotating arm 50 should preferably be kept within the fan-shaped space of the adjacent rotation center and should not collide with the entity of the adjacent rotation center node, it can be taken as follows:

[0043] Step Six: Determine the center line of the chute, in conjunction with... Figure 8 and Figure 9 As shown, 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 where the upper surface of the upper ring plate of the hydraulic cylinder support is located. The equation of the center line of the slide groove is determined according to formula (1).

[0044]

[0045] 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.

[0046] The adjustable-radius ring-type hydraulic pile-cutting device designed according to this design method involves the following steps: The rotary hydraulic cylinder 40 extends to push the pin of the rotating arm 50, causing the rotating arm 50 to rotate counterclockwise around the rotation center axis 14. This causes 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 within the slide groove 13, gradually reducing the pile-cutting radius of the pile-cutting rod 30. Conversely, the retraction operation of the rotary hydraulic cylinder 40 pulls the pin of the rotating arm 50, causing the rotating arm 50 to rotate clockwise around the rotation center axis 14. This causes the pile-cutting hydraulic cylinder 20 to rotate around the center of the hydraulic cylinder support 10 and gradually 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 within the slide groove 13, gradually increasing the pile-cutting radius of the pile-cutting rod 30. 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.

[0047] Traditional pile-cutting devices cannot adjust the position of the hydraulic cylinder; they can only move the cutting rod via the hydraulic cylinder to cut the pile. Because the hydraulic cylinder 20 is limited by its extension and retraction stroke, the range of motion of the cutting rod is restricted, making it unsuitable for piles with large or small radii, resulting in poor versatility. For different pile diameters, it is often necessary to replace the pile-cutting device with one whose cutting radius matches the pile diameter. 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 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 towards or away from the center of the hydraulic cylinder support 10. This adjusts the cutting radius of the cutting rod 30, allowing the device to adapt to a wider range of pile diameters and improving its versatility.

[0048] In one specific embodiment, combined with Figures 1 to 7 As shown, the rotary hydraulic cylinder has a first lug 41 and a second lug 43 at both ends, with the second lug located at the end of the telescopic rod 42 of the rotary hydraulic cylinder. Both the first lug 41 and the second lug 43 have pin holes, and the first lug 41 is pinned to the hinge node 15 on the hydraulic cylinder support 10. One end of the rotating arm 50 has a pin 51, and the other end has a first positioning shaft hole 52. The pin 51 is hinged to the second lug 43 of the rotary hydraulic cylinder 40, and 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 located 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.

[0049] 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.

[0050] 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.

[0051] Combination Figures 1 to 9 The proof of formula (1) will be further described below:

[0052] 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:

[0053] (x0-l OA ) 2 +y0 2 =r 2 (2)

[0054] 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:

[0055]

[0056] 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:

[0057]

[0058] 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, x-x0>0;

[0059] make Substituting this into formula (4), we get:

[0060]

[0061] Substituting formula (3) into formula (5) yields the following:

[0062]

[0063] Formula (1) can be obtained from formula (6).

[0064] In one specific embodiment, the pile cutting radius R0 can be expressed as a function of θ, then:

[0065]

[0066] In the formula, d0 is the distance from the tip of the pile cutting hydraulic cylinder 20 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.

[0067] The proof of formula (7) is as follows:

[0068] 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:

[0069] R0 = l OB -d0; (8)

[0070] 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:

[0071]

[0072] Substituting equation (9) into equation (8) yields equation (7).

[0073] 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.

[0074] 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 design method for a ring-type hydraulic pile-cutting device with adjustable radius, characterized in that, The 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. The hydraulic cylinder support includes an upper and lower annular ring plates, each with several sets of sliding grooves. Each set of sliding grooves corresponds to a central rotating shaft and a hinge node. Each set of sliding grooves corresponds to a pile-cutting hydraulic cylinder and a pile-cutting steel rod. The outer wall of the pile-cutting hydraulic cylinder is provided with an outer positioning shaft and an inner positioning shaft. The outer positioning shaft is located in the sliding groove and can slide along the groove. Each pile-cutting hydraulic cylinder has a pile-cutting steel rod at its end. One end of the steel rod 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 of the rotating arm is pinned to the central rotating shaft, one end of the rotating arm is pinned to the inner positioning shaft, and the other end is pinned to one end of the rotary power hydraulic cylinder. The other end of the rotary power hydraulic cylinder is pinned to the hinge node. The design method includes the following steps: Step 1: Determine the cutting radius of the adjustable-radius ring-type hydraulic pile cutting device. R 0 adjustment range ; Step 2: Determine the center distance between the inner and outer positioning shafts of the pile-cutting hydraulic cylinder. l 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. d 0, and the inner diameters of the upper and lower ring plates of the hydraulic cylinder support. R 1.Outer diameter R 2, of which R 0max + d 0 < R 1 < R 0mi + d 0n + l , R 2> R 0max + d 0+ l ; Step 3: Determine the position of the rotation center A of the hydraulic cylinder rotating arm for pile cutting, and the distance from point A to the center O of the annular disk. satisfy ; Step 4: Determine the number N of circumferentially distributed hydraulic cylinders for pile cutting; Step 5: Determine the length of the rotating arm of the pile-cutting hydraulic cylinder; Step Six: Determine the center line of the slide groove, taking 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 equation of the center line of the chute is determined according to formula (1); ，（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.

2. The design method of the radius-adjustable ring-type hydraulic pile-cutting device as described in claim 1, characterized in that, Pile cutting radius R 0 represents θ Given the functional relationship, then: ， （2）。 3. The design method of the radius-adjustable ring-type hydraulic pile-cutting device as described in claim 1 or 2, 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.

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