CN108978658B - Pile pressing hydraulic system and pile pressing method of static pile pressing machine - Google Patents
Pile pressing hydraulic system and pile pressing method of static pile pressing machine Download PDFInfo
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- CN108978658B CN108978658B CN201810856190.5A CN201810856190A CN108978658B CN 108978658 B CN108978658 B CN 108978658B CN 201810856190 A CN201810856190 A CN 201810856190A CN 108978658 B CN108978658 B CN 108978658B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/20—Placing by pressure or pulling power
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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Abstract
A pile pressing hydraulic system and a pile pressing method of a static pile pressing machine are disclosed, wherein the pile pressing hydraulic system of the static pile pressing machine comprises an upper pile pressing oil cylinder (2) and a lower pile pressing oil cylinder (3); a first directional control valve (1); a first two-way cartridge valve (4); a second two-way cartridge valve (5), a third two-way cartridge valve (6), a fourth two-way cartridge valve (7) and a fifth two-way cartridge valve (8) as well as a first one-way valve (9); a second direction-changing valve (10) and a third direction-changing valve (11); the second reversing valve (10) controls the first two-way cartridge valve (4); the valve ports of the second two-way cartridge valve (5) and the third two-way cartridge valve (6) are opened and closed; the third reversing valve (11) controls the opening and closing of the valve ports of the fourth two-way cartridge valve (7) and the fifth two-way cartridge valve (8); the pile pressing process comprises the steps of quick pile pressing, cyclic continuous pile pressing and slow high-pressure pile pressing.
Description
Technical Field
The invention relates to a static pile press in engineering machinery, in particular to a pile pressing hydraulic system of the static pile press; the invention also relates to a pile pressing method of the static pile pressing machine.
Background
The static pile press is introduced and used from the nineties of the 20 th century in China, and the machine is mainly produced and used in China in the world at present; the static pile press has the advantages of no noise, no pollution (motor drive) and high operation efficiency, and is particularly suitable for urban building foundation construction.
The static pile press is operated by clamping the pile body with the hydraulic oil cylinder of the pile clamp, pushing the pile clamp to press the pile body into the ground with the pile press oil cylinder, and making the pile sink by overcoming the earth plug and radiation damping of the stratum with the hydraulic oil cylinder by the dead weight of the pile press.
CN2703034Y discloses a hydraulic differential control device for a static pile driver. The pile pressing device comprises a multi-way valve, wherein a pressure oil input port of the multi-way valve is communicated with an output end of a pressure oil supply system, a reversing control valve, a cartridge valve C and a cartridge valve D are arranged, a pressure oil output port of the multi-way valve is communicated with a forward pressure oil input port of a pile pressing oil cylinder, an oil return port of the multi-way valve is communicated with an output port of the cartridge valve C, an input port of the cartridge valve C is communicated with an output port of the cartridge valve D, a joint of the input port of the cartridge valve and the output port of the pile pressing oil cylinder is communicated with a reverse input port/oil outlet of the pile pressing oil cylinder, an input port of the cartridge valve D is communicated with an output port of the multi-way valve.
In the prior art, a static pile press is lack of continuous pile pressing function during operation, flexibility during pile pressing operation is lack, and construction efficiency needs to be improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a pile pressing hydraulic system of a static pile pressing machine, which has flexible pile pressing operation and high construction efficiency; the invention also provides a pile pressing method with flexible pile pressing operation and high construction efficiency.
In order to solve the technical problem, on one hand, the invention provides a pile pressing hydraulic system of a static pile pressing machine, which comprises an upper pile pressing oil cylinder and a lower pile pressing oil cylinder; the first reversing valve is communicated with a pressure oil port and a hydraulic oil supply oil way, an oil return port and an oil return way, and a first working oil port and a rodless cavity of the upper pile pressing oil cylinder; the oil port A is communicated with a first working oil port of the first reversing valve through an oil pipe, and the oil port B is communicated with a rodless cavity of the lower pile pressing oil cylinder through an oil pipe; the oil port A is communicated with a first working oil port of the first reversing valve through an oil pipe, and the oil port B is communicated with the oil ports A of the second two-way cartridge valve and the third two-way cartridge valve through the oil pipe; the oil port A is communicated with a second working oil port of the first reversing valve through an oil pipe, and the oil port B is communicated with the oil port A of the second two-way cartridge valve, the oil port A of the third two-way cartridge valve and the oil port B of the fourth two-way cartridge valve through the oil pipe; the oil inlet is communicated with the hydraulic oil supply oil way; the oil inlet is communicated with the oil outlet of the first one-way valve, and the oil return port is communicated with the oil return tank; a first working oil port of the second reversing valve is communicated with control oil ports of the first two-way cartridge valve and the third two-way cartridge valve through oil pipes, and a second working oil port is communicated with a control oil port of the second two-way cartridge valve through the oil pipes; a first working oil port of the third reversing valve is communicated with a control oil port of the fourth two-way cartridge valve through an oil pipe, and a second working oil port is communicated with a control oil port of the fifth two-way cartridge valve through an oil pipe; an oil port B of the second two-way cartridge valve is communicated with a rodless cavity of the lower pile pressing oil cylinder through an oil pipe; an oil port B of the third two-way cartridge valve is communicated with rod cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder through oil pipes; the rod cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder are communicated through oil pipes.
As a further improved technical scheme, the pile-pressing hydraulic system of the static pile-pressing machine provided by the invention is also provided with a second one-way valve, wherein an oil inlet of the second one-way valve is communicated with an oil outlet of the first one-way valve through an oil pipe, and an oil outlet of the second one-way valve is communicated with oil inlets of a second reversing valve and a third reversing valve through oil pipes; and the pressure stabilizing tank is communicated with a connecting oil pipe between the first one-way valve and the second one-way valve.
As a further improved technical scheme, in the pile pressing hydraulic system of the static pile press, the first reversing valve is a three-position four-way electromagnetic valve; the second reversing valve and the third reversing valve are both two-position four-way electromagnetic valves; the first two-way cartridge valve, the second two-way cartridge valve, the third two-way cartridge valve, the fourth two-way cartridge valve and the fifth two-way cartridge valve are all two-way threaded cartridge valves. Each two-way threaded cartridge valve has A, B working ports, one control port.
In order to solve the technical problem, on the other hand, the invention provides a pile pressing method of a static pile press, which controls the pile pressing process through a pile pressing hydraulic system of the static pile press, wherein the pile pressing hydraulic system of the static pile press comprises an upper pile pressing oil cylinder and a lower pile pressing oil cylinder; the first reversing valve is communicated with a pressure oil port and a hydraulic oil supply oil way, an oil return port and an oil return way, and a first working oil port and a rodless cavity of the upper pile pressing oil cylinder; the oil port A is communicated with a first working oil port of the first reversing valve through an oil pipe, and the oil port B is communicated with a rodless cavity of the lower pile pressing oil cylinder through an oil pipe; the oil port A is communicated with a first working oil port of the first reversing valve through an oil pipe, and the oil port B is communicated with the oil ports A of the second two-way cartridge valve and the third two-way cartridge valve through the oil pipe; the oil port A is communicated with a second working oil port of the first reversing valve through an oil pipe, and the oil port B is communicated with the oil port A of the second two-way cartridge valve, the oil port A of the third two-way cartridge valve and the oil port B of the fourth two-way cartridge valve through the oil pipe; the oil inlet is communicated with the hydraulic oil supply oil way; the oil inlet is communicated with the oil outlet of the first one-way valve, and the oil return port is communicated with the oil return tank; a first working oil port of the second reversing valve is communicated with control oil ports of the first two-way cartridge valve and the third two-way cartridge valve through oil pipes, and a second working oil port is communicated with a control oil port of the second two-way cartridge valve through the oil pipes; a first working oil port of the third reversing valve is communicated with a control oil port of the fourth two-way cartridge valve through an oil pipe, and a second working oil port is communicated with a control oil port of the fifth two-way cartridge valve through an oil pipe; an oil port B of the second two-way cartridge valve is communicated with a rodless cavity of the lower pile pressing oil cylinder through an oil pipe; an oil port B of the third two-way cartridge valve is communicated with rod cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder through oil pipes; the rod cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder are communicated through oil pipes; the pile pressing process comprises the steps of quick pile pressing, cyclic continuous pile pressing and slow high-pressure pile pressing;
the rapid pile pressing device comprises a first reversing valve, a second reversing valve, a first two-way cartridge valve, a second two-way cartridge valve, a third two-way cartridge valve, a first working oil port, a second working oil port, a control oil return box and a quick pile pressing device, wherein the oil inlet of the first reversing valve is communicated with the first working oil port, so that the control oil port of the first two-way cartridge valve is communicated with the first working oil port, the; an oil inlet of the third reversing valve is controlled to be communicated with the second working oil port, so that an oil inlet of the fifth two-way cartridge valve is controlled to be communicated with oil, a valve port of the fifth two-way cartridge valve is closed, a control oil port of the fourth two-way cartridge valve is controlled to be communicated with an oil return tank, and a valve port of the fourth two-way cartridge valve is opened; controlling a first working oil port of the first reversing valve to be communicated with a hydraulic oil feeding oil way, controlling a second working oil port to be communicated with an oil return way, simultaneously feeding oil into rodless cavities of an upper pile pressing oil cylinder and a lower pile pressing oil cylinder, simultaneously feeding oil into rod cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder, and feeding the oil returned from the rod cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder into the rodless cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder after passing through a third two-way;
the circulating continuous pile pressing device comprises a control oil port, a first two-way cartridge valve, a second two-way cartridge valve, a third two-way cartridge valve, a circulating continuous pile pressing device and a circulating continuous pile pressing device, wherein the oil inlet of the second reversing valve is controlled to be communicated with a first working oil port, so that the control oil port of the first two-way cartridge valve and the control oil port of the third two-way cartridge valve are communicated with oil; an oil inlet of the third reversing valve is controlled to be communicated with the first working oil port, so that an oil control oil port of the fourth two-way cartridge valve is communicated with oil, a valve port of the fourth two-way cartridge valve is closed, a control oil port of the fifth two-way cartridge valve is communicated with an oil return tank, and a valve port of the fifth two-way cartridge valve is opened; controlling a first working oil port of the first reversing valve to be communicated with a hydraulic oil feeding oil way, controlling a second working oil port to be communicated with an oil return way, feeding oil into a rodless cavity of the upper pile pressing oil cylinder, feeding oil into a rod cavity of the upper pile pressing oil cylinder, feeding the oil into a rod cavity of the lower pile pressing oil cylinder, and feeding the oil into the oil return way after the rodless cavity of the lower pile pressing oil cylinder passes through the second two-way cartridge valve, the fifth two-way cartridge valve and the first reversing valve; after the piston rod of the upper pile-pressing oil cylinder reaches the maximum extension stroke, the flow direction of the first reversing valve is switched, the second working oil port of the first reversing valve is controlled to be communicated with a hydraulic oil supply oil way, the first working oil port is communicated with an oil return way, oil is fed into the rodless cavity of the lower pile-pressing oil cylinder, oil returned from the rod cavity of the lower pile-pressing oil cylinder enters the rod cavity of the upper pile-pressing oil cylinder, and oil returned from the rodless cavity of the upper pile-pressing oil cylinder enters the oil return way after passing through the first reversing valve;
the low-speed high-pressure pile pressing device comprises a control oil port, a valve port, a control oil return box and a low-pressure pile pressing box, wherein the control oil port is used for controlling the communication between an oil inlet of a second reversing valve and a second working oil port so as to enable the control oil port of a second two-way cartridge valve to be communicated with oil, the valve port of the second two-way cartridge valve is closed so as to enable the control oil port of a first two-way cartridge valve and the control oil port of a third; an oil inlet of the third reversing valve is controlled to be communicated with the first working oil port, so that an oil control oil port of the fourth two-way cartridge valve is communicated with oil, a valve port of the fourth two-way cartridge valve is closed, a control oil port of the fifth two-way cartridge valve is communicated with an oil return tank, and a valve port of the fifth two-way cartridge valve is opened; controlling a first working oil port of the first reversing valve to be communicated with a hydraulic oil feeding oil way, controlling a second working oil port to be communicated with an oil return way, simultaneously feeding oil into rodless cavities of an upper pile pressing oil cylinder and a lower pile pressing oil cylinder, simultaneously feeding oil into rod cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder, feeding the oil into the oil return way after the oil in the rod cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder passes through a third two-way cartridge valve and; after piston rods of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder reach the maximum extension stroke, the flow direction of the first reversing valve is switched, a second working oil port of the first reversing valve is controlled to be communicated with a hydraulic oil supply oil way, a first working oil port is controlled to be communicated with an oil return way, rod cavities of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder simultaneously feed oil, rodless cavity return oil of the upper pile pressing oil cylinder enters the oil return way after passing through the first reversing valve, and rodless cavity return oil of the lower pile pressing oil cylinder enters the oil return way through a first reversing valve of a first two-way cartridge valve.
The above improvements can be implemented alone or in combination without conflict.
According to the pile pressing hydraulic system of the static pile press, the second reversing valve and the third reversing valve control the oil passing or oil returning box of the control oil port of each two-way cartridge valve, so that the valve port of each two-way cartridge valve is controlled to be closed or opened; the oil inlet or return flow direction of the upper pile pressing oil cylinder and the lower pile pressing oil cylinder can be switched by matching with the flow direction switching of the first reversing valve. The control of the pile pressing process is realized, and the rapid pile pressing, the cyclic continuous pile pressing and the slow high-pressure pile pressing can be carried out according to the resistance and the construction condition of the stratum in the pile pressing process. The pile pressing operation is flexible, and the construction efficiency is high.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this application, but are not intended to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a pile pressing hydraulic system of a static pile pressing machine according to an embodiment.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The pile pressing hydraulic system of the static pile pressing machine shown in fig. 1 comprises an upper pile pressing oil cylinder 2 and a lower pile pressing oil cylinder 3; the first reversing valve 1 is communicated with a pressure oil port and a hydraulic oil supply oil way, an oil return port and an oil return way, and a first working oil port is communicated with a rodless cavity of the upper pile pressing oil cylinder 2; the oil port A is communicated with a first working oil port of the first reversing valve 1 through an oil pipe, and the oil port B is communicated with a rodless cavity of the lower pile-pressing oil cylinder 3 through an oil pipe; the oil port A is communicated with a first working oil port of the first reversing valve 1 through an oil pipe, and the oil port B is communicated with the oil ports A of the second two-way cartridge valve 5 and the third two-way cartridge valve 6 through the oil pipe; the oil port A is communicated with a second working oil port of the first reversing valve 1 through an oil pipe, and the oil port B is communicated with the oil port A of the second two-way cartridge valve 5, the oil port A of the third two-way cartridge valve 6 and the oil port B of the fourth two-way cartridge valve 7 through the oil pipe; the oil inlet is communicated with a hydraulic oil supply oil path through a first one-way valve 9; the oil inlet is communicated with the oil outlet of the first one-way valve 9, and the oil return port is communicated with the oil return tank through a second reversing valve 10 and a third reversing valve 11; a first working oil port of the second reversing valve 10 is communicated with control oil ports of the first two-way cartridge valve 4 and the third two-way cartridge valve 6 through oil pipes, and a second working oil port is communicated with a control oil port of the second two-way cartridge valve 5 through oil pipes; a first working oil port of the third reversing valve 11 is communicated with a control oil port of the fourth two-way cartridge valve 7 through an oil pipe, and a second working oil port is communicated with a control oil port of the fifth two-way cartridge valve 8 through an oil pipe; an oil port B of the second two-way cartridge valve 5 is communicated with a rodless cavity of the lower pile pressing oil cylinder 3 through an oil pipe; an oil port B of the third two-way cartridge valve 6 is communicated with rod cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 through oil pipes; the rod cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 are communicated through oil pipes.
The working principle is as follows: the second reversing valve 10 and the third reversing valve 11 control the oil passing or oil returning tank of the control oil port of each two-way cartridge valve, so that the valve port of each two-way cartridge valve is controlled to be closed or opened; the oil inlet or return flow direction of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 can be switched by matching with the flow direction switching of the first reversing valve 1. The control of the pile pressing process is realized, and the rapid pile pressing, the cyclic continuous pile pressing and the slow high-pressure pile pressing can be carried out according to the resistance and the construction condition of the stratum in the pile pressing process.
The rapid pile pressing method comprises the following steps: controlling an oil inlet of a second reversing valve 10 to be communicated with a second working oil port, enabling a control oil port of a second two-way cartridge valve 5 to be communicated with oil, closing a valve port of the second two-way cartridge valve 5, enabling control oil ports of a first two-way cartridge valve 4 and a third two-way cartridge valve 6 to be communicated with an oil return tank, and opening valve ports of the first two-way cartridge valve 4 and the third two-way cartridge valve 6; controlling an oil inlet of a third reversing valve 11 to be communicated with a second working oil port, so that a control oil port of a fifth two-way cartridge valve 8 is communicated with oil, a valve port of the fifth two-way cartridge valve 8 is closed, a control oil port of a fourth two-way cartridge valve 7 is communicated with an oil return tank, and a valve port of the fourth two-way cartridge valve 7 is opened; and a first working oil port of the first reversing valve 1 is controlled to be communicated with a hydraulic oil supply path, a second working oil port is controlled to be communicated with an oil return path, rodless cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 are simultaneously fed with oil, rod cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 are simultaneously fed with oil, and the return oil of the rod cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 enters the rodless cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 after passing through a third two-way cartridge valve 6 and a fourth two-way cartridge valve 7. The rodless cavity and the rod cavity of the upper pile pressing oil cylinder 2 are connected in series, the rodless cavity and the rod cavity of the lower pile pressing oil cylinder 3 are connected in series, differential connection is achieved, oil inlet and oil return of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 are connected together, the rod cavity oil of the upper pile pressing oil cylinder 2 and the rod cavity oil of the lower pile pressing oil cylinder 3 are hydraulically returned to the rodless cavity, the speed of outward extension of piston rods of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 can be increased, and the device can be used in a no-load or small-load fast-forward pile pressing process when pile pressing starts, and pile pressing efficiency is improved.
The circulating continuous pile pressing method comprises the following steps: controlling an oil inlet of a second reversing valve 10 to be communicated with a first working oil port, enabling control oil ports of a first two-way cartridge valve 4 and a third two-way cartridge valve 6 to be communicated with oil, closing valve ports of the first two-way cartridge valve 4 and the third two-way cartridge valve 6, enabling a control oil port of the second two-way cartridge valve 5 to be communicated with an oil tank, and opening a valve port of the second two-way cartridge valve 5; controlling an oil inlet of a third reversing valve 11 to be communicated with a first working oil port, so that a control oil port of a fourth two-way cartridge valve 7 is communicated with oil, a valve port of the fourth two-way cartridge valve 7 is closed, a control oil port of a fifth two-way cartridge valve 8 is communicated with an oil return tank, and a valve port of the fifth two-way cartridge valve 8 is opened; controlling a first working oil port of the first reversing valve 1 to be communicated with a hydraulic oil feeding oil way, controlling a second working oil port to be communicated with an oil return way, feeding oil into a rodless cavity of the upper pile pressing oil cylinder 2, feeding oil into a rod cavity of the upper pile pressing oil cylinder 2, feeding the oil returned from the rod cavity of the upper pile pressing oil cylinder 2 into a rod cavity of the lower pile pressing oil cylinder 3, and feeding the oil returned from the rodless cavity of the lower pile pressing oil cylinder 3 into the oil return way after passing through a second two-way cartridge valve 5, a fifth two-way cartridge valve 8 and the first reversing valve; after the piston rod of the upper pile pressing oil cylinder 2 reaches the maximum extension stroke, the flow direction of the first reversing valve 1 is switched, the second working oil port of the first reversing valve 1 is controlled to be communicated with a hydraulic oil supply oil way, the first working oil port is controlled to be communicated with an oil return way, the rodless cavity of the lower pile pressing oil cylinder 3 is fed with oil, the rod cavity of the upper pile pressing oil cylinder 2 is fed with oil, and the rodless cavity of the upper pile pressing oil cylinder 2 is fed with oil through the first reversing valve 1. The circular continuous pile pressing can be used for pile pressing at the stage of uniform load in the pile pressing process, the operation process can be simple and convenient, and the pile pressing efficiency is improved.
The low-speed high-pressure pile pressing method comprises the following steps: controlling an oil inlet of a second reversing valve 10 to be communicated with a second working oil port, enabling a control oil port of a second two-way cartridge valve 5 to be communicated with oil, closing a valve port of the second two-way cartridge valve 5, enabling control oil ports of a first two-way cartridge valve 4 and a third two-way cartridge valve 6 to be communicated with an oil return tank, and opening valve ports of the first two-way cartridge valve 4 and the third two-way cartridge valve 6; controlling an oil inlet of a third reversing valve 11 to be communicated with a first working oil port, so that a control oil port of a fourth two-way cartridge valve 7 is communicated with oil, a valve port of the fourth two-way cartridge valve 7 is closed, a control oil port of a fifth two-way cartridge valve 8 is communicated with an oil return tank, and a valve port of the fifth two-way cartridge valve 8 is opened; controlling a first working oil port of the first reversing valve 1 to be communicated with a hydraulic oil supply oil way and a second working oil port to be communicated with an oil return way, simultaneously feeding oil into rodless cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3, simultaneously feeding oil into rod cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3, and feeding the oil return into the oil return way after the oil return of the rod cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 passes through a third two-way cartridge valve; after piston rods of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 reach the maximum extending stroke, the flow direction of the first reversing valve 1 is switched, a second working oil port of the first reversing valve 1 is controlled to be communicated with a hydraulic oil supply oil way, a first working oil port is controlled to be communicated with an oil return way, rod cavities of the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 simultaneously feed oil, rodless cavity return oil of the upper pile pressing oil cylinder 2 enters the oil return way after passing through the first reversing valve 1, and rodless cavity return oil of the lower pile pressing oil cylinder 3 enters the oil return way through the first reversing valve 1 of the first two-way cartridge valve 4. The low-speed high-pressure pile pressing can provide larger pile pressing pressure, and can be used for pile pressing at a stage with larger load in the pile pressing process, such as pile pressing under the condition that soil is hard or the pile is deeply buried at the later stage of pile pressing.
Furthermore, the technical scheme provided by the invention is also provided with a second one-way valve 12, wherein the oil inlet of the second one-way valve is communicated with the oil outlet of the first one-way valve 9 through an oil pipe, and the oil outlet of the second one-way valve is communicated with the oil inlets of the second reversing valve 10 and the third reversing valve 11 through oil pipes; and the pressure stabilizing tank 13 is communicated with a connecting oil pipe between the first check valve 9 and the second check valve 12. The first one-way valve 9, the second one-way valve 12 and the pressure stabilizing tank 13 can stabilize the oil supply pressure of the second reversing valve 10 and the third reversing valve 11, and prevent the failure of the control of each two-way cartridge valve due to pressure fluctuation when the upper pile pressing oil cylinder 2 and the lower pile pressing oil cylinder 3 are filled with oil.
Optionally, in the technical scheme provided by the invention, the first reversing valve 1 is a three-position four-way electromagnetic valve; the second reversing valve 10 and the third reversing valve 11 are both two-position four-way electromagnetic valves; the first two-way cartridge valve 4, the second two-way cartridge valve 5, the third two-way cartridge valve 6, the fourth two-way cartridge valve 7 and the fifth two-way cartridge valve 8 are all two-way threaded cartridge valves.
It is obvious that the present invention is not limited to the above preferred embodiments, and various changes and modifications can be made within the spirit of the present invention defined by the claims and the specification, so that the same technical problems can be solved and the intended technical effects can be obtained, and thus, they are not repeated. All solutions which can be directly or indirectly derived from the disclosure of the present invention by a person skilled in the art are within the spirit of the present invention as defined by the appended claims.
Claims (4)
1. A pile pressing hydraulic system of a static pile pressing machine comprises an upper pile pressing oil cylinder (2) and a lower pile pressing oil cylinder (3); the hydraulic pile driving device is characterized by further comprising a first reversing valve (1) with a pressure oil port communicated with a hydraulic oil supply oil way, an oil return port communicated with an oil return way, and a first working oil port communicated with a rodless cavity of the upper pile pressing oil cylinder (2); the oil port A is communicated with a first working oil port of the first reversing valve (1) through an oil pipe, and the oil port B is communicated with a rodless cavity of the pile-pressing oil cylinder (3) through the oil pipe; the oil port A is communicated with a first working oil port of the first reversing valve (1) through an oil pipe, and the oil port B is communicated with the oil ports A of the second two-way cartridge valve (5) and the third two-way cartridge valve (6) through the oil pipe; the oil port A is communicated with a second working oil port of the first reversing valve (1) through an oil pipe, and the oil port B is communicated with the oil port A of the second two-way cartridge valve (5), the oil port A of the third two-way cartridge valve (6) and the oil port B of the fourth two-way cartridge valve (7) through the oil pipe; the oil inlet is communicated with the hydraulic oil feeding oil way through a first one-way valve (9); the oil inlet is communicated with the oil outlet of the first one-way valve (9), and the oil return port is communicated with the oil return tank; a first working oil port of the second reversing valve (10) is communicated with control oil ports of the first two-way cartridge valve (4) and the third two-way cartridge valve (6) through oil pipes, and a second working oil port is communicated with a control oil port of the second two-way cartridge valve (5) through oil pipes; a first working oil port of the third reversing valve (11) is communicated with a control oil port of the fourth two-way cartridge valve (7) through an oil pipe, and a second working oil port is communicated with a control oil port of the fifth two-way cartridge valve (8) through an oil pipe; an oil port B of the second two-way cartridge valve (5) is communicated with a rodless cavity of the lower pile-pressing oil cylinder (3) through an oil pipe; an oil port B of the third two-way cartridge valve (6) is communicated with rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) through oil pipes; the rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) are communicated through an oil pipe.
2. The pile-pressing hydraulic system of the static pile-pressing machine according to claim 1, characterized in that the pile-pressing hydraulic system is further provided with a second one-way valve (12) of which the oil inlet is communicated with the oil outlet of the first one-way valve (9) through an oil pipe and the oil outlet is communicated with the oil inlets of the second reversing valve (10) and the third reversing valve (11) through an oil pipe; and the pressure stabilizing tank (13) is communicated with a connecting oil pipe between the first check valve (9) and the second check valve (12).
3. The pile-pressing hydraulic system of a static pile-pressing machine according to claim 1, characterized in that the first reversing valve (1) is a three-position four-way solenoid valve; the second reversing valve (10) and the third reversing valve (11) are both two-position four-way electromagnetic valves; the first two-way cartridge valve (4), the second two-way cartridge valve (5), the third two-way cartridge valve (6), the fourth two-way cartridge valve (7) and the fifth two-way cartridge valve (8) are all two-way threaded cartridge valves.
4. A pile pressing method of a static pile press controls the pile pressing process through a pile pressing hydraulic system of the static pile press, and is characterized in that the pile pressing hydraulic system of the static pile press comprises an upper pile pressing oil cylinder (2) and a lower pile pressing oil cylinder (3); the first reversing valve (1) is communicated with a pressure oil port and a hydraulic oil supply oil way, an oil return port and an oil return way, and a first working oil port is communicated with a rodless cavity of the upper pile pressing oil cylinder (2); the oil port A is communicated with a first working oil port of the first reversing valve (1) through an oil pipe, and the oil port B is communicated with a rodless cavity of the pile-pressing oil cylinder (3) through the oil pipe; the oil port A is communicated with a first working oil port of the first reversing valve (1) through an oil pipe, and the oil port B is communicated with the oil ports A of the second two-way cartridge valve (5) and the third two-way cartridge valve (6) through the oil pipe; the oil port A is communicated with a second working oil port of the first reversing valve (1) through an oil pipe, and the oil port B is communicated with the oil port A of the second two-way cartridge valve (5), the oil port A of the third two-way cartridge valve (6) and the oil port B of the fourth two-way cartridge valve (7) through the oil pipe; the oil inlet is communicated with the hydraulic oil feeding oil way through a first one-way valve (9); the oil inlet is communicated with the oil outlet of the first one-way valve (9), and the oil return port is communicated with the oil return tank; a first working oil port of the second reversing valve (10) is communicated with control oil ports of the first two-way cartridge valve (4) and the third two-way cartridge valve (6) through oil pipes, and a second working oil port is communicated with a control oil port of the second two-way cartridge valve (5) through oil pipes; a first working oil port of the third reversing valve (11) is communicated with a control oil port of the fourth two-way cartridge valve (7) through an oil pipe, and a second working oil port is communicated with a control oil port of the fifth two-way cartridge valve (8) through an oil pipe; an oil port B of the second two-way cartridge valve (5) is communicated with a rodless cavity of the lower pile-pressing oil cylinder (3) through an oil pipe; an oil port B of the third two-way cartridge valve (6) is communicated with rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) through oil pipes; the rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) are communicated through an oil pipe; the pile pressing process comprises the steps of quick pile pressing, cyclic continuous pile pressing and slow high-pressure pile pressing;
the rapid pile pressing method comprises the steps of controlling an oil inlet of a second reversing valve (10) to be communicated with a second working oil port, enabling a control oil port of a second two-way cartridge valve (5) to be filled with oil, closing a valve port of the second two-way cartridge valve (5), enabling control oil ports of a first two-way cartridge valve (4) and a third two-way cartridge valve (6) to be communicated with an oil tank, and opening valve ports of the first two-way cartridge valve (4) and the third two-way cartridge valve (6); an oil inlet of the third reversing valve (11) is controlled to be communicated with the second working oil port, so that an oil control oil port of the fifth two-way cartridge valve (8) is communicated with oil, a valve port of the fifth two-way cartridge valve (8) is closed, a control oil port of the fourth two-way cartridge valve (7) is communicated with an oil return tank, and a valve port of the fourth two-way cartridge valve (7) is opened; controlling a first working oil port of a first reversing valve (1) to be communicated with a hydraulic oil supply oil way and a second working oil port to be communicated with an oil return way, simultaneously feeding oil into rodless cavities of an upper pile pressing oil cylinder (2) and a lower pile pressing oil cylinder (3), simultaneously feeding oil into rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3), and feeding the oil returned from the rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) into the rodless cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) after passing through a third two-way cartridge valve (6) and a fourth two-way cartridge valve (7);
the circulating continuous pile pressing comprises a step of controlling an oil inlet of a second reversing valve (10) to be communicated with a first working oil port, so that control oil ports of a first two-way cartridge valve (4) and a third two-way cartridge valve (6) are communicated with oil, valve ports of the first two-way cartridge valve (4) and the third two-way cartridge valve (6) are closed, a control oil port of the second two-way cartridge valve (5) is communicated with an oil tank, and a valve port of the second two-way cartridge valve (5) is opened; an oil inlet of a third reversing valve (11) is controlled to be communicated with a first working oil port, so that a control oil port of a fourth two-way cartridge valve (7) is communicated with oil, a valve port of the fourth two-way cartridge valve (7) is closed, a control oil port of a fifth two-way cartridge valve (8) is communicated with an oil return tank, and a valve port of the fifth two-way cartridge valve (8) is opened; controlling a first working oil port of a first reversing valve (1) to be communicated with a hydraulic oil supply oil way and a second working oil port to be communicated with an oil return way, feeding oil into a rodless cavity of an upper pile pressing oil cylinder (2), feeding oil into a rod cavity of the upper pile pressing oil cylinder (2) and feeding the oil into a rod cavity of a lower pile pressing oil cylinder (3), and feeding the oil into the oil return way after the rodless cavity of the lower pile pressing oil cylinder (3) passes through a second two-way cartridge valve (5), a fifth two-way cartridge valve (8) and the first reversing valve (1); after a piston rod of the upper pile pressing oil cylinder (2) reaches the maximum extension stroke, the flow direction of the first reversing valve (1) is switched, a second working oil port of the first reversing valve (1) is controlled to be communicated with a hydraulic oil supply oil way, a first working oil port is controlled to be communicated with an oil return way, oil is fed into a rodless cavity of the lower pile pressing oil cylinder (3), oil returned from a rod cavity of the lower pile pressing oil cylinder (3) enters a rod cavity of the upper pile pressing oil cylinder (2), and oil returned from the rodless cavity of the upper pile pressing oil cylinder (2) enters an oil return way after passing through the first reversing valve (1);
the low-speed high-pressure pile pressing method comprises the steps of controlling an oil inlet of a second reversing valve (10) to be communicated with a second working oil port, enabling a control oil port of a second two-way cartridge valve (5) to be communicated with oil, closing a valve port of the second two-way cartridge valve (5), enabling control oil ports of a first two-way cartridge valve (4) and a third two-way cartridge valve (6) to be communicated with an oil return box, and opening valve ports of the first two-way cartridge valve (4) and the third two-way cartridge valve (6); an oil inlet of a third reversing valve (11) is controlled to be communicated with a first working oil port, so that a control oil port of a fourth two-way cartridge valve (7) is communicated with oil, a valve port of the fourth two-way cartridge valve (7) is closed, a control oil port of a fifth two-way cartridge valve (8) is communicated with an oil return tank, and a valve port of the fifth two-way cartridge valve (8) is opened; controlling a first working oil port of a first reversing valve (1) to be communicated with a hydraulic oil supply oil way and a second working oil port to be communicated with an oil return way, simultaneously feeding oil into rodless cavities of an upper pile pressing oil cylinder (2) and a lower pile pressing oil cylinder (3), simultaneously feeding oil into rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3), simultaneously feeding oil into the rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3), and feeding the oil returned from the rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) into the oil return way through a third two-way cartridge valve (6) and a; after piston rods of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) reach the maximum extension stroke, the flow direction of the first reversing valve (1) is switched, a second working oil port of the first reversing valve (1) is controlled to be communicated with a hydraulic oil supply oil way, a first working oil port is controlled to be communicated with an oil return way, rod cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) simultaneously feed oil, rodless cavities of the upper pile pressing oil cylinder (2) and the lower pile pressing oil cylinder (3) return oil, rodless cavity return oil of the upper pile pressing oil cylinder (2) enters the oil return way through the first reversing valve (1), and rodless cavity return oil of the lower pile pressing oil cylinder (3) enters the oil return way through the first two-way cartridge valve (4) and the first reversing valve (1).
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| CN108978658A (en) | 2018-12-11 |
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