Hydraulic cylinders, static pile drivers, and pile extraction control methods

Abstract

This invention discloses a hydraulic cylinder, a static pile driver, and a pile-pulling control method, relating to the field of hydraulic technology. In the hydraulic cylinder, the piston includes a piston end plate and a piston rod. The piston end plate is built into the cylinder body and can slide within the cylinder body in a predetermined direction, dividing the cylinder body into a rodless chamber and a rod chamber. The piston rod and the rod chamber are located on the same side of the piston end plate. The piston rod includes an end cap and an annular piston side plate. The two ends of the piston side plate are respectively sealed and connected to the piston end plate and the end cap. The end cap is externally placed within the cylinder body. A piston rod chamber is formed between the piston end plate, the piston side plate, and the end cap. The piston side plate is slidably connected to a rod hole on the cylinder body. The portion of the piston rod chamber located within the cylinder body is the inner rod cylinder cavity, and the portion located outside the cylinder body is the outer rod cylinder cavity. The portion of the rod chamber located outside the piston side plate constitutes the outer rod cavity. This hydraulic cylinder has good applicability and is more convenient to use.

Description

Technical Field

[0001] This invention relates to the field of hydraulic technology, and in particular to a hydraulic cylinder, a static pile driver, and a pile pulling control method. Background Technology

[0002] Hydraulic static pile drivers are widely used in pile construction for buildings, roads, etc. Different tonnage requirements may be required during use. In one existing technology, this is achieved by replacing hydraulic cylinders of different tonnages, which is costly and inconvenient to use.

[0003] Therefore, how to provide a hydraulic cylinder with good applicability is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a hydraulic cylinder and a static pile driver including the above-mentioned hydraulic cylinder. The hydraulic cylinder has good applicability and can meet different tonnage requirements. Another object of the present invention is to provide a pile pulling control method using the above-mentioned hydraulic cylinder, which has good applicability and can meet different tonnage requirements.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A hydraulic cylinder includes a cylinder body and a piston rod. The piston includes a piston end plate and a piston rod fixed to the piston end plate. The piston end plate is built into the cylinder body and can slide in the cylinder body along a predetermined direction. The piston end plate divides the cylinder body into a rodless chamber and a rod chamber. The piston rod and the rod chamber are located on the same side of the piston end plate.

[0007] The piston rod includes an end cap and an annular piston side plate. In the predetermined direction, one end of the piston side plate is sealed to the piston end plate and the other end is sealed to the end cap. The end cap is placed outside the cylinder body so that a piston rod cavity is formed between the piston end plate, the piston side plate and the end cap. The piston side plate is slidably connected to a rod hole on the cylinder body and is sealed to the rod hole. The portion of the piston rod cavity inside the cylinder body is the inner cavity of the rod body, and the portion outside the cylinder body is the outer cavity of the rod body. The portion of the rod cavity outside the piston side plate constitutes the outer cavity of the rod body.

[0008] The rodless cavity is connected to the rodless cavity flow channel, the rod outer cavity is connected to the rod outer cavity flow channel, the rod cylinder inner cavity is connected to the rod cylinder inner cavity flow channel, and the rod cylinder outer cavity is connected to the rod cylinder outer cavity flow channel.

[0009] Preferably, a guide rod is provided in the middle of the cylinder body. The guide rod is a rod-shaped structure extending along the preset direction, and both ends of the guide rod in the preset direction are fixed to the cylinder body. A sliding hole is provided in the middle of the piston end plate. The sliding hole is slidably sleeved on the outside of the guide rod, and the sliding hole is sealed to the guide rod.

[0010] Preferably, the guide rod extends into the inside of the piston side plate.

[0011] Preferably, a first flow channel is formed on the guide rod. The first flow channel is a strip-shaped flow channel extending along the preset direction. The two ends of the first flow channel are respectively connected to a first through hole and a second through hole on the cylinder body to form at least a portion of the rod body cylinder outer cavity flow channel.

[0012] Preferably, in the preset direction, a second flow channel is formed on the guide rod; one end of the second flow channel is opened on the side wall of the guide rod to connect with the inner cavity of the rod body cylinder, and the other end of the second flow channel is opened to connect with a third through hole on the cylinder body, so that the second flow channel and the third through hole connect to form at least part of the inner cavity flow channel of the rod body cylinder, and the third through hole and the rod cavity are respectively located on both sides of the piston end plate.

[0013] A static pile driver includes a hydraulic cylinder, an oil source, and an oil tank as described in any one of the claims, wherein the hydraulic cylinder is connected to the oil source and the oil tank.

[0014] A method for controlling pile extraction by applying the hydraulic cylinder described in the claims, the control method comprising:

[0015] Receive a start command, which is a pile driving command or a pile pulling command;

[0016] When the starting command is the pile driving command, the oil source is controlled to supply oil to the rodless cavity flow channel and / or the rod cylinder outer cavity flow channel, so that the piston extends out of the cylinder body.

[0017] When the starting command is the piling command, the oil source is controlled to supply oil to the inner cavity flow channel of the rod cylinder and / or the outer cavity flow channel of the rod, so that the piston retracts into the cylinder.

[0018] Preferably, the pile driving command is a first-level pile driving command, a second-level pile driving command, or a third-level pile driving command;

[0019] When the pile driving command is the first-level pile driving command, the oil source is controlled to supply oil to the flow channel of the rod cylinder outer cavity, and the flow channel of the rod outer cavity and the flow channel of the rod cylinder inner cavity are controlled to be connected to the flow channel of the rodless cavity, so that the oil in the rod outer cavity and the rod cylinder inner cavity flows to the rodless cavity, and the oil source replenishes oil to the flow channel of the rodless cavity with the help of the negative pressure in the rodless cavity;

[0020] When the pile driving command is the secondary pile driving command, the oil source is controlled to supply oil to the rodless cavity flow channel, and the rod outer cavity flow channel and the rod cylinder inner cavity flow channel are controlled to be connected to the rod cylinder outer cavity flow channel and the oil tank, so that the oil in the rod outer cavity and the rod cylinder inner cavity flows to the rod cylinder outer cavity and flows back to the oil tank;

[0021] When the pile driving command is the third-level pile driving command, the oil source is controlled to supply oil to the flow channel of the rod cylinder outer cavity and the flow channel of the rodless cavity, and the flow channel of the rod outer cavity and the flow channel of the rod cylinder inner cavity are controlled to be connected to the oil tank, so that the oil in the rod outer cavity and the rod cylinder inner cavity flows back to the oil tank.

[0022] Preferably, the pile extraction command is a first-level pile extraction command, a second-level pile extraction command, or a third-level pile extraction command;

[0023] When the pile extraction command is a first-level pile extraction command, the oil source is controlled to supply oil to the inner cavity flow channel of the rod cylinder, and the rodless cavity flow channel and the outer cavity flow channel of the rod cylinder are controlled to be connected to the outer cavity flow channel of the rod and the oil tank, so that the oil in the rodless cavity and the outer cavity of the rod cylinder flows to the outer cavity of the rod and flows back to the oil tank;

[0024] When the pile extraction command is a secondary pile extraction command, the oil source is controlled to supply oil to the rod outer cavity flow channel, and the rodless cavity flow channel and the rod cylinder outer cavity flow channel are controlled to connect to the rod cylinder inner cavity flow channel and the oil tank, so that the oil in the rodless cavity and the rod cylinder outer cavity flows to the rod cylinder inner cavity and flows back to the oil tank;

[0025] When the pile extraction command is a level 3 pile extraction command, the oil source is controlled to supply oil to the inner cavity flow channel of the rod cylinder and the outer cavity flow channel of the rod, and the rodless cavity flow channel and the outer cavity flow channel of the rod cylinder are controlled to be connected to the oil tank so that the oil in the rodless cavity and the outer cavity of the rod cylinder flows back to the oil tank.

[0026] The hydraulic cylinder provided by this invention includes a cylinder body and a piston rod. The piston includes a piston end plate and a piston rod fixed to the piston end plate. The piston end plate is built into the cylinder body and can slide within the cylinder body along a predetermined direction. The piston end plate divides the cylinder body into a rodless chamber and a rod chamber, with the piston rod and the rod chamber located on the same side of the piston end plate. The piston rod includes an end cap and an annular piston side plate. In the predetermined direction, one end of the piston side plate is sealed to the piston end plate, and the other end is sealed to the end cap. The end cap is externally located... The cylinder body forms a piston rod cavity between the piston end plate, piston side plate, and end cap. The piston side plate is slidably connected to the rod hole on the cylinder body and is sealed to the rod hole. The part of the piston rod cavity inside the cylinder body is the inner rod cavity, and the part outside the cylinder body is the outer rod cavity. The part of the rod cavity located outside the piston side plate constitutes the outer rod cavity. The rodless cavity is connected to the rodless cavity flow channel, the outer rod cavity is connected to the outer rod cavity flow channel, the inner rod cavity is connected to the inner rod cavity flow channel, and the outer rod cavity is connected to the outer rod cavity flow channel.

[0027] Based on the division of the cylinder body into four oil chambers—the rodless chamber, the rod cylinder outer chamber, the rod cylinder inner chamber, and the rod outer chamber—oil can be supplied to different oil chambers through an external oil source to provide different levels of pile driving force or pile pulling force. One hydraulic cylinder can adapt to different tonnage requirements, making it highly adaptable and more convenient to use.

[0028] The static pile driver including the above-mentioned hydraulic cylinder and the pile pulling control method using the above-mentioned hydraulic cylinder provided by the present invention have good applicability and can meet different tonnage requirements. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0030] Figure 1 This is a cross-sectional view of a specific embodiment of the hydraulic cylinder provided by the present invention.

[0031] Figure label:

[0032] Rodless cavity flow channel 1, rod cylinder outer cavity flow channel 2, rod cylinder inner cavity flow channel 3, rod outer cavity flow channel 4, cylinder body 5, first through hole 51, second through hole 52, third through hole 53, piston 6, piston end plate 61, piston rod 62, piston side plate 621, end cap 622, guide rod 7, first flow channel 71, second flow channel 72;

[0033] A. Rodless cavity; B. Rod cylinder outer cavity; C. Rod cylinder inner cavity; D. Rod outer cavity. Detailed Implementation

[0034] 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.

[0035] The core of this invention is to provide a hydraulic cylinder and a static pile driver including the aforementioned hydraulic cylinder. The hydraulic cylinder has good applicability and can meet different tonnage requirements. Another core aspect of this invention is to provide a pile driving and extraction control method using the aforementioned hydraulic cylinder, which also has good applicability and can meet different tonnage requirements.

[0036] For a specific embodiment of the hydraulic cylinder provided by this invention, please refer to [the specific embodiment]. Figure 1 It includes cylinder 5 and piston rod 62.

[0037] The piston 6 includes a piston end plate 61 and a piston rod 62 fixed to the piston end plate 61. The piston end plate 61 is built into the cylinder 5 and can slide within the cylinder 5 along a predetermined direction X. In this embodiment, as... Figure 1 As shown, the preset direction X is the up-down direction. The piston end plate 61 divides the cylinder 5 into a rodless chamber A and a rod chamber, and the piston rod 62 is located on the same side of the piston end plate 61 as the rod chamber.

[0038] The piston rod 62 includes an end cap 622 and an annular piston side plate 621. In a predetermined direction X, one end of the piston side plate 621 is sealed to the piston end plate 61, and the other end is sealed to the end cap 622. The end cap 622 is externally positioned on the cylinder body 5, so that a piston rod cavity is formed between the piston end plate 61, the piston side plate 621, and the end cap 622. The piston side plate 621 is slidably connected to and sealed to the rod hole on the cylinder body 5. The portion of the piston rod cavity located inside the cylinder body 5 is the rod cylinder inner cavity C, and the portion located outside the cylinder body 5 is the rod cylinder outer cavity B. The portion of the rod cavity located outside the piston side plate 621 constitutes the rod outer cavity D. That is, the overlapping portion of the rod cavity and the piston rod cavity is the rod cylinder inner cavity C, and the remaining portion of the rod cavity is the rod outer cavity D. As the piston 6 moves in the cylinder body 5, the sizes of the rodless cavity A, the rod cylinder outer cavity B, the rod cylinder inner cavity C, and the rod outer cavity D will change accordingly. In addition, the size of the cylinder body cavity and piston rod cavity can be set as needed, for example, the cylinder body cavity can be larger than the piston rod cavity.

[0039] The rodless cavity A is connected to the rodless cavity flow channel 1, the rod outer cavity D is connected to the rod outer cavity flow channel 4, the rod body cylinder inner cavity C is connected to the rod body cylinder inner cavity flow channel 3, and the rod body cylinder outer cavity B is connected to the rod body cylinder outer cavity flow channel 2. Each cavity is connected to the oil tank or oil source through the corresponding flow channel.

[0040] In this embodiment, the hydraulic cylinder is divided into four oil chambers in the cylinder body 5: rodless chamber A, rod cylinder outer chamber B, rod cylinder inner chamber C, and rod outer chamber D. Oil can be supplied to different oil chambers through an external oil source to provide different levels of pile driving force or pile pulling force. One hydraulic cylinder can adapt to different tonnage requirements, and the hydraulic cylinder has good applicability and is more convenient to use.

[0041] Furthermore, a guide rod 7 is provided in the middle of the cylinder body 5. The guide rod 7 is a rod-shaped structure extending along a preset direction X, and the two ends of the guide rod 7 in the preset direction X are respectively fixed to the cylinder body 5. A sliding hole is provided in the middle of the piston end plate 61. The sliding hole is slidably sleeved on the outside of the guide rod 7, and the sliding hole is sealed to the guide rod 7. The guide rod 7 can guide the piston 6, which can improve the smoothness of the piston 6 movement.

[0042] Furthermore, the guide rod 7 extends into the inner side of the piston side plate 621, that is, the guide rod 7 extends into the inner cavity C of the rod cylinder in the piston rod chamber. A first flow channel 71 is formed on the guide rod 7. The first flow channel 71 is a strip-shaped flow channel extending along a predetermined direction X. Both ends of the first flow channel 71 are connected to the first through hole 51 and the second through hole 52 on the cylinder body 5, respectively, to form at least a portion of the rod cylinder outer cavity flow channel 2, facilitating machining. The first flow channel 71 is directly set using the guide rod 7 to form a portion of the rod cylinder outer cavity flow channel 2. Furthermore, on the outside of the cylinder body 5, an oil pipe can be connected to one end of the cylinder body 5 away from the piston rod 62 to form another part of the rod cylinder outer cavity flow channel 2, such as... Figure 1 The piston rod 62 extends from the bottom of the cylinder 5, and the oil pipe is connected to the upper side of the cylinder 5, which can prevent the oil pipe from affecting the movement of the piston 6.

[0043] Furthermore, a second flow channel 72 is formed on the guide rod 7 in the preset direction X. One end of the second flow channel 72 is open to the side wall of the guide rod 7 to connect to the inner cavity C of the rod body cylinder, and the other end of the second flow channel 72 is open to connect to the third through hole 53 on the cylinder body 5, so that the second flow channel 72 and the third through hole 53 are connected to form at least part of the inner cavity flow channel 3 of the rod body cylinder. The third through hole 53 and the rod cavity are respectively located on both sides of the piston end plate 61. An oil pipe can be connected to the third through hole 53 to form another part of the inner cavity flow channel 3 of the rod body cylinder. This oil pipe will not affect the movement of the piston 6.

[0044] Of course, in other embodiments, through holes can be provided on the side wall of the piston 6 to connect oil pipes, serving as the rod body cylinder outer cavity flow channel 2 and the rod body cylinder inner cavity flow channel 3. Additionally, through holes connecting the rodless cavity A and the rod outer cavity D can be provided on the side wall of the cylinder body 5, serving as the rodless cavity flow channel 1 and the rod outer cavity flow channel 4, respectively. Furthermore, in other embodiments, the cylinder body is not limited to having four oil chambers; more oil chambers can be provided.

[0045] The hydraulic cylinder in this embodiment is applied to a static pile driver and can perform pile driving and extraction operations, providing various pile driving and extraction forces. The specific workflow is as follows:

[0046] Output driving force 1: Hydraulic oil is supplied to the rod cylinder outer cavity flow channel 2 and enters the rod cylinder outer cavity B on the piston 6. At this time, the piston 6 moves downward to extend the cylinder 5, and the two chambers, rod outer cavity D and rod cylinder inner cavity C, are compressed, while the rodless cavity A is in a vacuum state. Through external hydraulic control, the hydraulic oil discharged from the two chambers, rod outer cavity D and rod cylinder inner cavity C, is introduced into the rodless cavity flow channel 1 through rod outer cavity flow channel 4 and rod cylinder inner cavity flow channel 3, and enters the rodless cavity A to replenish oil. At the same time, some hydraulic oil is supplied externally to replenish the rodless cavity A. This state is for rapid driving of piles with small tonnage.

[0047] Output pile driving force two: Hydraulic oil is supplied to the rodless cavity flow channel 1 and enters the rodless cavity A. At this time, the piston 6 moves downward, and the two chambers, rod outer cavity D and rod body cylinder inner cavity C, are compressed, while rod body cylinder outer cavity B is in a vacuum state. Through external hydraulic control, the hydraulic oil discharged from the two chambers, rod outer cavity D and rod body cylinder inner cavity C, is introduced from rod outer cavity flow channel 4 and rod body cylinder inner cavity flow channel 3 into rod body cylinder outer cavity flow channel 2, and enters rod body cylinder outer cavity B to replenish oil. At the same time, the excess hydraulic oil in rod outer cavity D and rod body cylinder inner cavity C returns to the oil tank. This state is for pile driving at a certain tonnage.

[0048] Output pile driving force three: Hydraulic oil is simultaneously supplied to the rod cylinder outer cavity flow channel 2 and the rodless cavity flow channel 1, respectively entering the rodless cavity A and the rod cylinder outer cavity B. At this time, the piston 6 moves downward, and the two chambers of the rod outer cavity D and the rod cylinder inner cavity C are squeezed. The hydraulic oil returns to the oil tank from the rod outer cavity flow channel 4 and the rod cylinder inner cavity flow channel 3. This state is the large-tonnage pile driving.

[0049] Output of the first extraction force: Hydraulic oil is supplied to the flow channel 3 inside the rod cylinder and enters the inner cavity C of the rod cylinder. At this time, the piston 6 moves upward to retract the cylinder 5. The rodless cavity A and the outer cavity B of the rod cylinder are compressed, and the outer cavity D of the rod is in a vacuum state. Through external hydraulic control, the hydraulic oil discharged from the rodless cavity A and the outer cavity B of the rod cylinder is introduced into the outer cavity flow channel 4 of the rod through the flow channel 1 of the rodless cavity and the flow channel 2 of the outer cavity of the rod cylinder, and enters the outer cavity D to replenish the oil. At the same time, the excess hydraulic oil returns to the oil tank. This state is rapid extraction and rapid return.

[0050] Output of the second pile-pulling force: Hydraulic oil is supplied to the rod outer cavity flow channel 4 and enters the rod outer cavity D. At this time, the piston 6 moves upward to retract the cylinder 5. The rodless cavity A and the rod cylinder outer cavity B are compressed, and the rod cylinder inner cavity C is in a vacuum state. Through external hydraulic control, the hydraulic oil discharged from the rodless cavity A and the rod cylinder outer cavity B is introduced from the rodless cavity flow channel 1 and the rod cylinder outer cavity flow channel 2 into the rod cylinder inner cavity flow channel 3, and enters the rod cylinder inner cavity C to replenish oil. At the same time, the excess hydraulic oil returns to the oil tank. This state can provide a certain pile-pulling force.

[0051] Output of pile pulling force 3: Hydraulic oil is simultaneously supplied to the inner cavity flow channel 3 and the outer cavity flow channel 4 of the rod body cylinder, respectively entering the inner cavity C and the outer cavity D of the rod body cylinder. At this time, the piston 6 moves upward to retract the cylinder 5, and the rodless cavity A and the outer cavity B of the rod body cylinder are squeezed, and the hydraulic oil returns directly to the oil tank. This state can provide a larger pile pulling force.

[0052] Among them, the pile driving force increases gradually from level one to level two, and the pile extraction force increases gradually from level one to level three.

[0053] The hydraulic cylinder in this embodiment can provide multi-stage pile driving force and multi-stage pile extraction force. When working with small tonnage, it can perform rapid pile driving or extraction; when working with large tonnage, it can obtain a larger pile driving force or pile extraction force and can return quickly, which can meet the requirements of static pile driving machines for high tonnage.

[0054] In addition to the aforementioned hydraulic cylinder, this invention also provides a static pile driver, which includes a hydraulic cylinder, specifically the hydraulic cylinder provided in any of the above embodiments. The beneficial effects can be referred to the respective embodiments above. The static pile driver also includes an oil source and an oil tank, with the hydraulic cylinder connected to the oil source and the oil tank. The structure of other parts of the static pile driver is described in the prior art and will not be repeated here.

[0055] In addition to the hydraulic cylinder and static pile driver mentioned above, this invention also provides a pile pulling control method, which can be applied to the hydraulic cylinder or static pile driver mentioned above. The beneficial effects can be referred to the above embodiments accordingly.

[0056] Specifically, the control method includes:

[0057] Receive the start command, which can be either a pile driving command or a pile extraction command:

[0058] When the starting command is a pile driving command, the control oil source supplies oil to the rodless cavity flow channel 1 and / or the rod cylinder external cavity flow channel 2, so that the piston 6 extends outward from the cylinder 5;

[0059] When the starting command is the piling command, the control oil source supplies oil to the cylinder inner cavity flow channel 3 and / or the rod outer cavity flow channel 4, so that the piston 6 retracts into the cylinder 5.

[0060] The pile driving command can be classified as a first-level pile driving command, a second-level pile driving command, or a third-level pile driving command.

[0061] When the pile driving command is a first-level pile driving command, the control oil source supplies oil to the rod cylinder outer cavity flow channel 2, and the control rod outer cavity flow channel 4 and the rod cylinder inner cavity flow channel 3 are connected to the rodless cavity flow channel 1, so that the oil in the rod outer cavity D and the rod cylinder inner cavity C flows to the rodless cavity A, and the oil source replenishes oil to the rodless cavity flow channel 1 with the help of the negative pressure in the rodless cavity A;

[0062] When the pile driving command is a secondary pile driving command, the control oil source supplies oil to the rodless cavity flow channel 1, and the control rod outer cavity flow channel 4 and the rod cylinder inner cavity flow channel 3 are connected to the rod cylinder outer cavity flow channel 2 and the oil tank, so that the oil in the rod outer cavity D and the rod cylinder inner cavity C flows to the rod cylinder outer cavity B and flows back to the oil tank.

[0063] When the pile driving command is a level 3 pile driving command, the control oil source supplies oil to the rod cylinder outer cavity flow channel 2 and the rodless cavity flow channel 1, and the control rod outer cavity flow channel 4 and the rod cylinder inner cavity flow channel 3 are connected to the oil tank so that the oil in the rod outer cavity D and the rod cylinder inner cavity C flows back to the oil tank.

[0064] The pile extraction command can be classified as a first-level pile extraction command, a second-level pile extraction command, or a third-level pile extraction command.

[0065] When the pile extraction command is a first-level pile extraction command, the oil source is controlled to supply oil to the inner cavity flow channel 3 of the rod cylinder, and the rodless cavity flow channel 1 and the outer cavity flow channel 2 of the rod cylinder are connected to the outer cavity flow channel 4 and the oil tank, so that the oil in the rodless cavity A and the outer cavity B of the rod cylinder flows to the outer cavity D of the rod and flows back to the oil tank.

[0066] When the pile extraction command is a level 2 pile extraction command, the oil source is controlled to supply oil to the rod outer cavity flow channel 4, and the rodless cavity flow channel 1 and the rod cylinder outer cavity flow channel 2 are controlled to connect to the rod cylinder inner cavity C and the oil tank, so that the oil in the rodless cavity A and the rod cylinder outer cavity B flows to the rod cylinder inner cavity C and flows back to the oil tank.

[0067] When the pile extraction command is a level 3 pile extraction command, the oil source is controlled to supply oil to the rod cylinder inner cavity flow channel 3 and the rod outer cavity flow channel 4, and the rodless cavity flow channel 1 and the rod cylinder outer cavity flow channel 2 are controlled to be connected to the oil tank so that the oil in the rodless cavity A and the rod cylinder outer cavity B flows back to the oil tank.

[0068] It should be noted that when an element is referred to as "fixing" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as "connecting" another element, it can be directly connected to the other element or there may be an intervening element. Furthermore, in the description of this invention, unless otherwise stated, "multiple," "multiple roots," and "multiple groups" mean two or more.

[0069] The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0071] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0072] The hydraulic cylinder, static pile driver, and pile extraction control method provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A method of controlling a press-in pile, characterized by, The application relates to a static pile press, which comprises a hydraulic cylinder, an oil source and an oil tank, wherein the hydraulic cylinder is connected to the oil source and the oil tank; the hydraulic cylinder comprises a cylinder body (5) and a piston rod (62), the piston (6) comprises a piston end plate (61) and a piston rod (62) fixed to the piston end plate (61), the piston end plate (61) is arranged in the cylinder body (5) and can slide in the cylinder body (5) along a preset direction, the piston end plate (61) divides the cylinder body (5) into a rodless cavity (A) and a rod cavity, the piston rod (62) is located on the same side of the piston end plate (61) as the rod cavity; the piston rod (62) comprises an end cover (622) and a ring-shaped piston side plate (621), in the preset direction, one end of the piston side plate (621) is sealingly connected to the piston end plate (61) and the other end is sealingly connected to the end cover (622), the end cover (622) is arranged outside the cylinder body (5), so that the piston end plate (61), the piston side plate (621) and the end cover (622) form a piston rod cavity, the piston side plate (621) is slidingly connected to a rod hole on the cylinder body (5) and is sealingly connected to the rod hole, the part of the piston rod cavity located in the cylinder body (5) is a rod body cylinder inner cavity (C) and the part of the piston rod cavity located outside the cylinder body (5) is a rod body cylinder outer cavity (B), the part of the rod cavity located outside the piston side plate (621) constitutes a rod outer cavity (D); the rodless cavity (A) is connected to a rodless cavity flow channel (1), the rod outer cavity (D) is connected to a rod outer cavity flow channel (4), the rod body cylinder inner cavity (C) is connected to a rod body cylinder inner cavity flow channel (3), and the rod body cylinder outer cavity (B) is connected to a rod body cylinder outer cavity flow channel (2); the control method comprises the following steps: receiving a starting instruction, the starting instruction being a pile pressing instruction or a pile pulling instruction; when the starting instruction is the pile pressing instruction, controlling the oil source to supply oil to the rodless cavity flow channel (1) and / or the rod body cylinder outer cavity flow channel (2), so that the piston (6) performs an extension movement out of the cylinder body (5); when the starting instruction is the pile pulling instruction, controlling the oil source to supply oil to the rod body cylinder inner cavity flow channel (3) and / or the rod outer cavity flow channel (4), so that the piston (6) performs a retraction movement into the cylinder body (5); the pile pressing instruction is a first-stage pile pressing instruction, a second-stage pile pressing instruction or a third-stage pile pressing instruction; when the pile pressing instruction is the first-stage pile pressing instruction, controlling the oil source to supply oil to the rod body cylinder outer cavity flow channel (2), and controlling the rod outer cavity flow channel (4) and the rod body cylinder inner cavity flow channel (3) to be connected to the rodless cavity flow channel (1), so that the oil in the rod outer cavity (D) and the rod body cylinder inner cavity (C) flows to the rodless cavity (A), and the oil source supplements oil to the rodless cavity flow channel (1) by means of the negative pressure in the rodless cavity (A). ​ ​ ​ When the pile pressing instruction is the second-level pile pressing instruction, the oil source is controlled to supply oil to the rodless cavity flow channel (1), and the rod outer cavity flow channel (4) and the rod body cylinder inner cavity flow channel (3) are controlled to be communicated with the rod body cylinder outer cavity flow channel (2) and the oil tank, so that the oil in the rod outer cavity (D) and the rod body cylinder inner cavity (C) flows to the rod body cylinder outer cavity (B) and flows back to the oil tank. When the pile pressing instruction is the third-level pile pressing instruction, the oil source is controlled to supply oil to the rod body cylinder outer cavity flow channel (2) and the rodless cavity flow channel (1), and the rod outer cavity flow channel (4) and the rod body cylinder inner cavity flow channel (3) are controlled to be communicated with the oil tank, so that the oil in the rod outer cavity (D) and the rod body cylinder inner cavity (C) flows back to the oil tank.

2. The press-in pile control method according to claim 1, characterized in that, A guide rod (7) is arranged in the middle of the cylinder body (5), the guide rod (7) is a rod-shaped structure extending along the preset direction, and both ends of the guide rod (7) in the preset direction are fixed to the cylinder body (5), a sliding hole is arranged in the middle of the piston end plate (61), the sliding hole is slidably sleeved outside the guide rod (7), and the sliding hole is in sealing connection with the guide rod (7).

3. The press-in pile control method according to claim 2, wherein The guide rod (7) extends into the inside of the piston side plate (621).

4. The press-in pile control method according to claim 3, wherein A first flow channel (71) is arranged on the guide rod (7), the first flow channel (71) is a strip-shaped flow channel extending along the preset direction, and both ends of the first flow channel (71) are respectively communicated with the first through hole (51) and the second through hole (52) on the cylinder body (5), so as to form at least part of the rod body cylinder outer cavity flow channel (2).

5. The press-in pile control method according to claim 3, wherein In the preset direction, a second flow channel (72) is arranged on the guide rod (7); one end of the second flow channel (72) is arranged in the side wall of the guide rod (7) to communicate with the rod body cylinder inner cavity (C), and the other end of the second flow channel (72) is communicated with the third through hole (53) on the cylinder body (5), so that the second flow channel (72) and the third through hole (53) are communicated to form at least part of the rod body cylinder inner cavity flow channel (3), and the third through hole (53) and the rod cavity are located on both sides of the piston end plate (61).

6. The press-in pile control method according to claim 1, wherein The pile pulling instruction is a first-level pile pulling instruction, a second-level pile pulling instruction or a third-level pile pulling instruction; When the pile pulling instruction is the first-level pile pulling instruction, the oil source is controlled to supply oil to the rod body cylinder inner cavity flow channel (3), and the rodless cavity flow channel (1) and the rod body cylinder outer cavity flow channel (2) are controlled to be communicated with the rod outer cavity flow channel (4) and the oil tank, so that the oil in the rodless cavity (A) and the rod body cylinder outer cavity (B) flows to the rod outer cavity (D) and flows back to the oil tank. When the pile pulling instruction is the second-level pile pulling instruction, the oil source is controlled to supply oil to the rod outer cavity flow channel (4), and the rodless cavity flow channel (1) and the rod body cylinder outer cavity flow channel (2) are controlled to be communicated with the rod body cylinder inner cavity flow channel (3) and the oil tank, so that the oil in the rodless cavity (A) and the rod body cylinder outer cavity (B) flows to the rod body cylinder inner cavity (C) and flows back to the oil tank. When the three-stage pulling instruction is received, the oil source is controlled to supply oil to the rod body cylinder inner cavity flow passage (3) and the rod outer cavity flow passage (4), and the rodless cavity flow passage (1) and the rod body cylinder outer cavity flow passage (2) are communicated with the oil tank, so that the oil in the rodless cavity (A) and the rod body cylinder outer cavity (B) flows back to the oil tank.

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