CN111022390A - Pile machine hydraulic control system with adjustable power head speed - Google Patents

Pile machine hydraulic control system with adjustable power head speed Download PDF

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Publication number
CN111022390A
CN111022390A CN201911382669.0A CN201911382669A CN111022390A CN 111022390 A CN111022390 A CN 111022390A CN 201911382669 A CN201911382669 A CN 201911382669A CN 111022390 A CN111022390 A CN 111022390A
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China
Prior art keywords
valve
control valve
feedback
power head
oil
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Granted
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CN201911382669.0A
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Chinese (zh)
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CN111022390B (en
Inventor
傅祖范
赵黎明
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CHTC Jove Heavy Industry Co Ltd
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CHTC Jove Heavy Industry Co Ltd
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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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F15B11/0426—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling the number of pumps or parallel valves switched on
    • 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
    • E02D7/02—Placing by driving
    • E02D7/06—Power-driven drivers
    • 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
    • E02D7/02—Placing by driving
    • E02D7/06—Power-driven drivers
    • E02D7/14—Components for drivers inasmuch as not specially for a specific driver construction
    • 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
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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

Abstract

The invention provides a pile machine hydraulic control system with adjustable power head speed, which comprises a power head motor, a digging machine multi-way valve, a regulating shuttle valve, a feedback control valve, a power head regulating pilot pressure source, a main pump I, a main pump II, a displacement control valve I and a displacement control valve II. And the speed regulation requirement of the power head can be met.

Description

Pile machine hydraulic control system with adjustable power head speed
Technical Field
The invention relates to a hydraulic control system of a pile machine, in particular to a hydraulic control system of a pile machine with an adjustable power head speed.
Background
The excavator is the engineering machinery with the highest yield in the engineering machinery, and due to the fact that the production batch is large, the excavator multi-way valve is stable in quality and high in cost performance. The production batch of the piling machinery is relatively small, the piling machinery has various structures and functions, corresponding hydraulic systems are different, and in order to improve the stability of the hydraulic system of the piling machinery, a part of hydraulic systems of the piling machinery adopt a multi-way valve of the excavator with high cost performance. The excavator valve group is integrally processed, and the valve group functions are all designed according to the working condition of the excavator.
The pile driving machine is characterized in that the pile driving machine is provided with a multi-way valve, the multi-way valve is arranged on the pile driving machine, and the multi-way valve is arranged on the pile driving machine. The existing pile machine part is provided with a drilling function and used for drilling rock masses when hard rock masses are met, the requirements on the rotating speed of the power head are different under different geological conditions, the oil supply quantity of a motor of the drilling power head directly determines the rotating speed of the power head, and therefore a hydraulic system which is stable in performance and used on the drilling power head of the pile machine is needed to meet the rotating speed requirements of different power heads.
Disclosure of Invention
The invention aims to provide a hydraulic control system of a pile machine with an adjustable power head speed, which aims to solve the problems in the background technology.
The utility model provides a stake machine hydraulic control system with adjustable unit head speed, includes the unit head motor, digs quick-witted multiple unit valve, regulation and control shuttle valve, feedback control valve, unit head regulation and control pilot pressure source, main pump one, main pump two, discharge capacity control valve one and discharge capacity control valve two, it includes 9 antithetical couplet function valves to dig quick-witted multiple unit valve, wherein 1 st ~ 5 antithetical couplet function valves connect the fuel feeding by main pump one, and 6 th ~ 9 antithetical couplet function valves connect the fuel feeding by main pump two, it is including feedback oil circuit PS to dig quick-witted multiple unit valve1And feedbackOil path PS2Said feedback oil path PS1Connected between the 1 st-5 th functional valve group and the first displacement control valve used for controlling the first displacement according to the feedback oil path PS1The oil pressure in the oil pump adjusts the discharge capacity of a first main pump, and the feedback oil path PS2Is connected between the 6 th-9 th functional valve group and the second displacement control valve which is used for controlling the second displacement according to the feedback oil path PS2The discharge capacity of a second main pump is adjusted according to the oil pressure, the 5 th-connection functional valve group and the 9 th-connection functional valve group are in confluence connection of a multi-way valve of the excavator, and working oil ports of the 5 th-connection functional valve group and the 9 th-connection functional valve group are arranged in a combined mode; the power head motor is used for connecting and driving a drill rod of the pile machine, and two working oil ports of the power head motor are respectively connected with two working oil ports formed by combining the 5 th connection function valve group and the 9 th connection function valve group;
the hydraulic control system with the adjustable power head speed comprises a 6 th-8 th combined functional valve group, one or a plurality of shuttle valve groups, wherein the shuttle valve group is used on mechanisms of the pile machine except a power head motor, the main control valve of each functional valve group used on the mechanisms of the pile machine except the power head motor in the 6 th-8 th combined functional valve group is correspondingly provided with a shuttle valve, the left pilot oil port and the right pilot oil port of the main control valve of each functional valve group are respectively connected with two oil inlets of the corresponding shuttle valve, when only one of the 6 th-8 th combined functional valve group is used on the mechanisms of the pile machine except the power head motor, the single shuttle valve corresponding to the one combined functional valve group is the regulating and controlling shuttle valve, when at least two of the 6 th-8 th combined functional valve group are used on the mechanisms of the pile machine except the power head motor, the hydraulic control system with the adjustable power head speed also comprises the shuttle valve group which is connected with the left pilot oil port and the right pilot oil port of each combined functional valve, the shuttle valve group is a multi-stage shuttle valve group with a tree-shaped connection structure, the number of the shuttle valve groups is gradually reduced, the first-stage shuttle valve is formed by shuttle valves connected with left and right pilot oil ports of all the function valve groups used in the 6 th-8 th function valve group, and a single shuttle valve of the last-stage shuttle valve is the regulating and controlling shuttle valve;
the feedback control valve is arranged on a feedback oil path PS2The oil outlet of the control shuttle valve and the pilot oil port of the feedback control valveThe power head regulating pilot pressure source is connected with a working oil port of a feedback control valve, the feedback control valve is used for switching a second displacement control valve between receiving pressure fed back by the 6 th-9 th-connection functional valve group and receiving pressure of the power head regulating pilot pressure source as feedback pressure, and the pressure of the power head regulating pilot pressure source is set to reduce the displacement of a second main pump to the minimum or a certain required minimum displacement, namely the displacement of the second main pump for the power head motor after being combined with the first main pump is reduced to meet the requirement of low rotating speed of the power head motor;
the control shuttle valve is used for providing pilot pressure for the feedback control valve to interrupt the connection between the second displacement control valve and the power head control pilot pressure source when any one of the 6 th-8 th function valve groups is operated, and the second displacement control valve is restored to be in pressure connection with the feedback of the 6 th-9 th function valve groups, so that the second main pump returns to normal displacement, and a mechanism corresponding to any one of the 6 th-8 th function valve groups obtains required flow.
The feedback control valve comprises a first feedback control valve and a second feedback control valve:
the feedback control valve I is provided with a working oil port E, a working oil port F and a working oil port G, the working oil port E is connected with the power head regulation pilot pressure source, and the working oil port F and the feedback oil path PS2Connecting; when the first feedback control valve is positioned at the left position, the working oil port E is cut off, the working oil port F is communicated with the working oil port G, and when the first feedback control valve is positioned at the right position, the working oil port F is cut off, and the working oil port E is communicated with the working oil port G; a left pilot oil port of the first feedback control valve is connected with an oil outlet of the regulating shuttle valve, and the first feedback control valve is positioned at the right position when the regulating shuttle valve has no pressure oil;
the feedback control valve II is provided with an oil port H, an oil port I and an oil port J, and the oil port H and a feedback oil path PS2Connection, oil port I and feedback oil path PS2The oil port J is connected with a working oil port G of the first feedback control valve; when the feedback control valve is positioned at the left position, the oil port H is cut off, and the oil port I is communicated with the oil port J; feedback control valveThe second is positioned at the right position when no external control action exists;
preferably, the second feedback control valve is an electromagnetic valve, and the switching of the second feedback control valve from the right position to the left position is realized by operating an electromagnetic switch.
Preferably, the first displacement control valve and the second displacement control valve are both negative flow displacement control valves.
The 5 th and 9 th function valve groups are valve groups of a multi-way valve of the excavator for the bucket arm oil cylinder.
The invention has at least the following beneficial effects:
the invention is based on that the 5 th linkage of the excavator multi-way valve on the market is a bucket rod valve group, and the 9 th linkage valve is also arranged in the excavator multi-way valve to be used as the confluence linkage of the 5 th linkage valve, so that large discharge capacity can be provided, and the requirement of high rotating speed of a power head can be met. However, the requirement of the drill bit on the rotating speed is different under different geological conditions, part of the geological conditions need low rotating speed, and the power head motor only needs single-pump oil supply at any time, but the confluence of the 5 th joint and the 9 th joint of the multi-way valve of the excavator is realized in the multi-way valve, and the single-pump oil supply of the system cannot be realized through the pilot control of the valve. If the bucket rod oil cylinder valve group of the existing excavator multi-way valve is directly used for controlling a power head motor of the pile machine, the speed regulation requirement of the power head motor cannot be met, so that the invention is improved based on the existing excavator multi-way valve and is used for driving and controlling the power head motor;
the invention is improved based on the existing excavator multi-way valve, a feedback control valve and a set of shuttle valve connected to the original interface of the excavator multi-way valve are added, the speed regulation requirement of a power head motor can be met, the influence on the work of other valve groups (namely 6 th-8 th functional valve groups) related to a main pump II can not be caused, the added element is connected to the outside of the excavator multi-way valve, the internal structure of the excavator multi-way valve does not need to be changed, namely the excavator valve groups with complex internal pipelines do not need to be disassembled and modified, the excavator valve groups with high cost performance can be smoothly and normally used on the power head valve groups of the pile driver, the manufacturing cost of pile driver machinery is effectively reduced, and the most important is that the stability of ensuring the product quality is greatly facilitated. And the speed regulation requirement of the power head can be met.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a hydraulic control system of a piling machine with adjustable power head speed according to a preferred embodiment of the present invention (in which a multiple-way valve of a digging machine is a prior art, and a part of pipelines related to the multiple-way valve of the digging machine are not shown);
FIG. 2 is an enlarged view of the functional valve block of the 5 th and 9 th groups of FIG. 1 according to the present invention;
FIG. 3 is an enlarged view of the functional valve set of the present invention shown in FIG. 1 from the 6 th to the 8 th;
fig. 4 is an enlarged view of the first and second main pumps and their associated piping of fig. 1 according to the present invention.
In the figure: 1-a power head motor, 2-a excavator multi-way valve, 201-a throttle valve, 202-a throttle valve, 21-a function valve group I, 22-a function valve group II, 23-a function valve group III, 24-a function valve group IV, 25-a function valve group V, 26-a function valve group VI, 260-a reversing valve six, 27-a function valve group VII, 270-a reversing valve VII, 28-a function valve group VIII, 280-a reversing valve VIII, 29-a function valve group nine, 30-a regulation shuttle valve, 31-a first-stage shuttle valve, 32-a second-stage shuttle valve, a 4-feedback control valve, 41-a feedback control valve I, 42-a feedback control valve II, 5-a power head regulation pilot pressure source, 6-a main pump I, 60-a displacement control valve I, 61-a displacement feedback device I, 7-a second main pump, 70-a second displacement control valve, 71-a second displacement feedback device, 8-a pilot pump.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Referring to fig. 1-4, a pile driver hydraulic control system with adjustable power head speed includes a power head motor 1, an excavator multi-way valve 2, a regulation shuttle valve 30, a feedback control valve 4, a power head regulation pilot pressure source 5, a first main pump 6, a second main pump 7, a first discharge capacity control valve 60 and a second discharge capacity control valve 70, the excavator multi-way valve includes a 9-connection functional valve group, wherein the 1 st to 5 th connection functional valve group is connected by the first main pump for oil supply, the 6 th to 9 th connection functional valve group is connected by the second main pump for oil supply, in the excavator multi-way valve shown in fig. 1, the 1 st to 5 th connection functional valve group respectively is: a first functional valve group 21, a second functional valve group 22, a third functional valve group 23, a fourth functional valve group 24 and a fifth functional valve group 25; the 6 th to 9 th functional valve groups are respectively as follows: six functional valve groups 26, seven functional valve groups 27, eight functional valve groups 28 and nine functional valve groups 29.
The multi-way valve of the excavator comprises a feedback oil path PS1And feedback oil path PS2Feedback oil path PS1The first discharge volume feedback device 61 is connected between the 1 st-5 th function valve group and the first discharge volume control valve, and the feedback oil path PS2The first displacement control valve is connected between the 6 th-9 th functional valve group and a second displacement feedback device 71 of the second displacement control valve and used for feeding back an oil path PS1The oil pressure in the oil pump adjusts the displacement of a first main pump, and a second displacement control valve is used for adjusting the displacement of a second main pump according to a feedback oil path PS2The oil pressure in the oil pump adjusts the discharge capacity of the second main pump.
In this embodiment, the first displacement control valve and the second displacement control valve are both negative-flow displacement control valves, and the multi-way valve of the excavator further comprises a feedback oil path PS connected with the first displacement control valve and the second displacement control valve respectively1And feedback oil path PS2A first throttle valve 201 and a second throttle valve 202 are connected. For the 6 th to 9 th valve banks associated with the second main pump, the negative flow and displacement control principle is as follows: when any one or more of the 6 th-9 th valve groups works, the flow rate before the second throttle valve (namely the left end of the second throttle valve in the figure 1) is reduced, and the corresponding feedback oil path PS behind the second throttle valve2The smaller the pressure in the middle, the feedback oil path PS2The pressure behind the second throttling valve (namely the right end of the second throttling valve in the figure 1) is fed back to a second displacement feedback device, the second displacement feedback device respectively increases the displacement of the second main pump, and conversely, decreases the displacement of the second main pumpIs small. For the 1 st to 5 th functional valve groups associated with the first main pump, the control principle of the negative flow and the discharge capacity is the same as that of the 6 th to 9 th functional valve groups associated with the second main pump.
In the embodiment, the 5 th function valve group and the 9 th function valve group are the multi-way valve of the excavator and are used for the confluence of the bucket rod oil cylinder, the working oil ports of the 5 th function valve group and the 9 th function valve group are arranged in a combined mode, and the pilot oil ports of the 5 th function valve group and the 9 th function valve group are also connected in parallel; the power head motor is used for connecting and driving a drill rod of the pile machine, and a working oil port C and a working oil port D of the power head motor are respectively connected with a working oil port A and a working oil port B which are combined by the 5 th-connection functional valve group and the 9 th-connection functional valve group;
the 6 th-8 th combined function valve group of the embodiment is used on other mechanisms of the pile machine except for a power head motor, the main control valves of the 6 th, 7 th and 8 th combined function valve groups are respectively a reversing valve six 260, a reversing valve seven 270 and a reversing valve eight 280, the reversing valve six 260, the reversing valve seven 270 and the reversing valve eight 280 are respectively and correspondingly provided with a first-stage shuttle valve 31, the left and right pilot oil ports of the reversing valve six 260, the reversing valve seven 270 and the reversing valve eight 280 are respectively connected to two oil inlets of the corresponding first-stage shuttle valve, the oil outlets of three first-stage shuttle valves are connected to the oil inlets of two second-stage shuttle valves 32 in parallel, the oil outlets of the two second-stage shuttle valves are connected to the oil inlet of a third-stage shuttle valve (namely, the regulating and controlling shuttle valve,
in this embodiment, the feedback control valve is disposed in the feedback oil path PS2In the present embodiment, the feedback control valve includes a first feedback control valve 41 and a second feedback control valve 42:
referring to fig. 1, in this embodiment, the first feedback control valve is provided with a working oil port E, a working oil port F and a working oil port G, the working oil port E is connected to the power head regulation pilot pressure source 5, and the working oil port F and the feedback oil path PS2Connecting; when the first feedback control valve is positioned at the left position, the working oil port E is cut off, the working oil port F is communicated with the working oil port G, and when the first feedback control valve is positioned at the right position, the working oil port F is cut off, and the working oil port E is communicated with the working oil port G; a left pilot oil port of the first feedback control valve is connected with an oil outlet of the regulating shuttle valve, and the first feedback control valve is positioned at the right position when the regulating shuttle valve has no pressure oil;
referring to fig. 1, in this embodiment, the second feedback control valve is provided with an oil port H, an oil port I, an oil port J, an oil port H, and a feedback oil path PS2Connection, oil port I and feedback oil path PS2The oil port J is connected with a working oil port G of the first feedback control valve; when the feedback control valve is positioned at the left position, the oil port H is cut off, and the oil port I is communicated with the oil port J; the feedback control valve II is positioned at the right position when no external control action is performed;
the pressure of the power head regulating pilot pressure source is set to reduce the displacement of the second main pump to the minimum or a certain required minimum displacement, specifically, for example, the pressure of the power head regulating pilot pressure source may be set to correspond to the minimum displacement of the second main pump, at this time, the displacement of the second main pump may be regarded as being approximately equal to zero, and the power head motor is equivalent to only one pump of the second main pump supplying oil. Of course, the pressure of the power head regulation pilot pressure source can also be set to correspond to the displacement of a certain required main pump II. The power head regulation pilot pressure source can be provided by an additional oil pump and an oil way, and can also be provided by combining a pilot pump 8 of the system with a certain oil way as a power source.
In this embodiment, the second feedback control valve is an electromagnetic valve, and the second feedback control valve is switched from the right position to the left position by operating an electromagnetic switch.
The working principle and the operation process of the invention are roughly as follows:
when the power head motor needs low rotating speed and the 6 th-8 th combined function valve set does not act, the power head motor is supplied with oil by the first main pump and the second main pump, the flow is too large, therefore, the discharge capacity of the second main pump needs to be reduced, the electromagnetic switch of the second feedback control valve is started, the second feedback control valve is switched to the left position, the second discharge capacity control valve 70 receives a pressure signal from the power head for regulating and controlling a pilot pressure source, and the discharge capacity of the second main pump is minimum or is at a certain value lower than the maximum discharge capacity.
When the discharge capacity of the second main pump is the minimum or is a certain value lower than the maximum discharge capacity, and any one or more of the 6 th to 8 th functional valve groups needs to act, the pilot handle of the corresponding reversing valve six 260, reversing valve seven 270 or reversing valve eight 280 is operated, so that the control shuttle valve can output pressure oil, the feedback control valve is switched to the left position, at the moment, the connection between the second discharge control valve and the power head control pilot pressure source is interrupted, the second discharge control valve 70 returns to the state of receiving a pressure signal from the rear end of the second throttle valve 202, the second main pump can increase the discharge capacity in time according to the pressure at the rear end of the second throttle valve 202, the functional valve group needing to act in the 6 th to 8 th groups obtains the required flow, the functional valve group which acts by the main pump shares the flow of the second power head with the functional valve group which acts in the 9 th group, and the rotating.
When the power head motor needs high rotating speed, the electromagnetic switch of the second feedback control valve is closed, the second feedback control valve returns to the right position, the second displacement control valve 70 returns to the state of receiving a pressure signal from the rear end of the second throttle valve 202, the 6-8-linked functional valve groups are completely closed, and then the second main pump only supplies oil to the power head motor so as to meet the high rotating speed requirement of the power head motor.
Description of the drawings: the excavator multi-way valve in the embodiment is the excavator multi-way valve of KYB corporation of japan. Since the excavator multi-way valve is a commonly-used product in the market at present, and the internal pipeline structure and the functional interface are both approaching to standardization, the invention does not show the complete internal pipeline connection structure of each valve set of the excavator multi-way valve in fig. 1, and only shows partial pipelines related to the improvement point of the invention. In addition, for convenience of description, the 9-unit functional valve group of the excavator multi-way valve is numbered from 1 to 9, the functional valve group associated with the first main pump is defined as the 1 st to 5 th unit, and the functional valve group associated with the second main pump is defined as the 6 th to 9 th unit.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a stake machine hydraulic control system with adjustable unit head speed, its characterized in that, include unit head motor (1), dig quick-witted multiple unit valve (2), regulation and control shuttle valve (30), feedback control valve (4), unit head regulation and control pilot pressure source (5), main pump (6), main pump two (7), discharge capacity control valve (60) and discharge capacity control valve two (70), it includes 9 and allies oneself with the function valves to dig quick-witted multiple unit valve, and wherein 1 st ~ 5 ally oneself with the function valves and connect the fuel feeding by the main pump, and 6 th ~ 9 ally oneself with the function valves and connect the fuel feeding by main pump two, it includes feedback oil circuit PS to dig quick-witted multiple unit valve1And feedback oil path PS2Said feedback oil path PS1Connected between the 1 st-5 th functional valve group and the first displacement control valve used for controlling the first displacement according to the feedback oil path PS1The oil pressure in the oil pump adjusts the discharge capacity of a first main pump, and the feedback oil path PS2Is connected between the 6 th-9 th functional valve group and the second displacement control valve which is used for controlling the second displacement according to the feedback oil path PS2The discharge capacity of a second main pump is adjusted according to the oil pressure, a 5 th-connection function valve group and a 9 th-connection function valve group are in confluence connection of the excavator multi-way valve, and working oil ports of the 5 th-connection function valve group and the 9 th-connection function valve group are arranged in a combined mode; the power head motor is used for connecting and driving a drill rod of the pile machine, and two working oil ports of the power head motor are respectively connected with two working oil ports formed by combining the 5 th connection function valve group and the 9 th connection function valve group;
the 6 th to 8 th combined functional valve group comprises one or a plurality of combined functional valve groups which are combined on other mechanisms of the pile machine except a power head motor, the main control valve of each functional valve group used on other mechanisms of the pile machine except the power head motor in the 6 th to 8 th combined functional valve group is respectively provided with a shuttle valve, the left and right pilot oil ports of the main control valve of each functional valve group are respectively connected with two oil inlets of the corresponding shuttle valve, when only one combined functional valve group in the 6 th to 8 th combined functional valve group is used on other mechanisms of the pile machine except the power head motor, the single shuttle valve corresponding to the combined functional valve group is the regulating and controlling shuttle valve, when at least two combined functional valve groups in the 6 th to 8 th combined functional valve group are used on other mechanisms of the pile machine except the power head motor, the hydraulic control system of the pile machine with adjustable speed also comprises the shuttle valve group which is connected with the left and right pilot oil ports of each combined functional valve group used in the 6 th to 8 th combined functional valve group, the shuttle valve group is a multi-stage shuttle valve group with a tree-shaped connection structure, the number of the shuttle valve groups is gradually reduced, the first-stage shuttle valve is formed by shuttle valves connected with left and right pilot oil ports of all the function valve groups used in the 6 th-8 th function valve group, and a single shuttle valve of the last-stage shuttle valve is the regulating and controlling shuttle valve;
the feedback control valve is arranged on a feedback oil path PS2The oil outlet of the regulating shuttle valve is connected with a pilot oil port of a feedback control valve, the power head regulating pilot pressure source is connected with a working oil port of the feedback control valve, the feedback control valve is used for switching a second displacement control valve between receiving pressure fed back by a 6 th-9 th-connection functional valve group and receiving pressure of the power head regulating pilot pressure source as feedback pressure, the pressure of the power head regulating pilot pressure source is set to enable the displacement of a second main pump to be reduced to the minimum or a certain required minimum displacement, namely the displacement of the second main pump for the power head motor after being originally converged with the first main pump is reduced, so that the low-rotation speed requirement of the power head motor is met;
the control shuttle valve is used for providing pilot pressure for the feedback control valve to interrupt the connection between the second displacement control valve and the power head control pilot pressure source when any one of the 6 th-8 th function valve groups is operated, and the second displacement control valve is restored to be in pressure connection with the feedback of the 6 th-9 th function valve groups, so that the second main pump returns to normal displacement, and a mechanism corresponding to any one of the 6 th-8 th function valve groups obtains required flow.
2. The hydraulic control system of a pile driver with adjustable power head speed according to claim 1, characterized in that the feedback control valve comprises a first feedback control valve (41) and a second feedback control valve (42):
the feedback control valve I is provided with a working oil port E, a working oil port F and a working oil port G, the working oil port E is connected with the power head regulation pilot pressure source, and the working oil port F and the feedback oil path PS2Connecting; when the feedback control valve is positioned at the left position, the working oil port E is cut off, and the working oil isThe port F is communicated with the working oil port G, when the feedback control valve is positioned at the right position, the working oil port F is stopped, and the working oil port E is communicated with the working oil port G; a left pilot oil port of the first feedback control valve is connected with an oil outlet of the regulating shuttle valve, and the first feedback control valve is positioned at the right position when the regulating shuttle valve has no pressure oil;
the feedback control valve II is provided with an oil port H, an oil port I and an oil port J, and the oil port H and a feedback oil path PS2Connected with oil port I and feedback oil path PS2The oil port J is connected with a working oil port G of the first feedback control valve; when the feedback control valve is positioned at the left position, the oil port H is cut off, and the oil port I is communicated with the oil port J; and the second feedback control valve is positioned at the right position when no external control action is performed.
3. The pile machine hydraulic control system with the adjustable power head speed according to claim 2, characterized in that the second feedback control valve is an electromagnetic valve, and the switching of the second feedback control valve from the right position to the left position is realized by operating an electromagnetic switch.
4. The hydraulic control system of a pile driver with an adjustable power head speed as claimed in claim 1, wherein the first displacement control valve and the second displacement control valve are negative flow displacement control valves.
5. The pile machine hydraulic control system with the adjustable power head speed of claim 1, wherein the function valve set of the 5 th connection and the function valve set of the 9 th connection are valve sets of a excavator multi-way valve for a bucket rod oil cylinder.
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JPS63190903A (en) * 1987-01-29 1988-08-08 Yutani Heavy Ind Ltd Automatic speed control circuit for hydraulic actuator
KR19990064721A (en) * 1999-05-03 1999-08-05 변수 Multi capability complex system of excavating equipment
CN102312451A (en) * 2010-06-30 2012-01-11 北汽福田汽车股份有限公司 Excavator converging control system and excavator thereof
CN204590113U (en) * 2015-04-21 2015-08-26 山河智能装备股份有限公司 Medium-sized multi-way valve of hydraulic excavator group
CN107701532A (en) * 2017-11-16 2018-02-16 恒天九五重工有限公司 Minus flow banked direction control valves hydraulic control system and its control method
CN109811823A (en) * 2019-03-19 2019-05-28 徐州徐工挖掘机械有限公司 A kind of excavator idling energy-saving control system and control method
CN211116860U (en) * 2019-12-27 2020-07-28 恒天九五重工有限公司 Pile machine hydraulic control system with adjustable power head speed

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63190903A (en) * 1987-01-29 1988-08-08 Yutani Heavy Ind Ltd Automatic speed control circuit for hydraulic actuator
KR19990064721A (en) * 1999-05-03 1999-08-05 변수 Multi capability complex system of excavating equipment
CN102312451A (en) * 2010-06-30 2012-01-11 北汽福田汽车股份有限公司 Excavator converging control system and excavator thereof
CN204590113U (en) * 2015-04-21 2015-08-26 山河智能装备股份有限公司 Medium-sized multi-way valve of hydraulic excavator group
CN107701532A (en) * 2017-11-16 2018-02-16 恒天九五重工有限公司 Minus flow banked direction control valves hydraulic control system and its control method
CN109811823A (en) * 2019-03-19 2019-05-28 徐州徐工挖掘机械有限公司 A kind of excavator idling energy-saving control system and control method
CN211116860U (en) * 2019-12-27 2020-07-28 恒天九五重工有限公司 Pile machine hydraulic control system with adjustable power head speed

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