CN111022390B - Pile machine hydraulic control system with adjustable power head speed - Google Patents
Pile machine hydraulic control system with adjustable power head speed Download PDFInfo
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- CN111022390B CN111022390B CN201911382669.0A CN201911382669A CN111022390B CN 111022390 B CN111022390 B CN 111022390B CN 201911382669 A CN201911382669 A CN 201911382669A CN 111022390 B CN111022390 B CN 111022390B
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 64
- 230000001105 regulatory effect Effects 0.000 claims abstract description 38
- 230000001276 controlling effect Effects 0.000 claims description 29
- 230000007246 mechanism Effects 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 4
- 238000005553 drilling Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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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
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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
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
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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
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
- E02D7/14—Components for drivers inasmuch as not specially for a specific driver construction
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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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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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
Abstract
The invention provides a pile driver hydraulic control system with adjustable power head speed, which comprises a power head motor, a multi-way valve of the power head, a regulating shuttle valve, a feedback control valve, a power head regulating pilot pressure source, a first main pump, a second main pump, a first displacement control valve and a second displacement control valve. And can meet the speed regulation requirement of the power head.
Description
Technical Field
The invention relates to a pile driver hydraulic control system, in particular to a pile driver hydraulic control system with an adjustable power head speed.
Background
The excavator is the engineering machine with the largest output in the engineering machine, and the quality of the multi-way valve of the excavator is stable and the cost performance is high because of large production batch. 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 systems of the piling machinery, part of the hydraulic systems of the piling machinery adopt a multi-way valve of the excavator with high cost performance. The valve group of the excavator is integrally machined, and the valve group functions are designed to adapt to the working condition of the excavator.
The pile machine has the advantages that each mechanism of the pile machine is generally independently controlled, the composite action is less used, the application of the multi-way valve of the excavator on the pile machine can be limited to a certain extent, or the working condition requirement of the pile machine can not be met, so that the existing multi-way valve of the excavator can not be directly used for the pile machine mechanism sometimes and needs to be improved, and the multi-way valve of the excavator is suitable for the working condition of the pile machine. The existing pile machine part is provided with a drilling function for drilling a rock body when encountering a hard rock body, under different geological conditions, the requirements on the rotating speed of a power head are different, and the oil supply quantity of a drilling power head motor directly determines the rotating speed of the power head, so that a hydraulic system with relatively stable performance for the pile machine drilling power head is also required to meet the requirements on the rotating speed of different power heads.
Disclosure of Invention
The invention aims to provide a pile driver hydraulic control system with an adjustable power head speed, which aims to solve the problems in the background technology.
The utility model provides a pile machine hydraulic control system with adjustable power head speed, including power head motor, dig quick-witted multiple unit valve, regulation and control shuttle valve, feedback control valve, power head regulation and control pilot pressure source, main pump one, main pump two, discharge capacity control valve one and discharge capacity control valve two, dig quick-witted multiple unit valve including 9 and link the functional valves, wherein 1 st ~ 5 the functional valves by main pump connection fuel feeding, 6 ~ 9 the functional valves by main pump two connect fuel feeding, dig quick-witted multiple unit valve including feedback oil circuit PS 1 and feedback oil circuit PS 2, feedback oil circuit PS 1 connects between 1 ~ 5 the functional valves and discharge capacity control valve one, discharge capacity control valve one is used for adjusting the discharge capacity of main pump one according to the oil pressure size in feedback oil circuit PS 1, feedback oil circuit PS 2 connects between 6 ~ 9 the functional valve and discharge capacity control valve two, 5 th the functional valve and 9 the functional valve of linking is the functional valve of digging is the combination of dig quick-witted multiple unit valve according to the oil pressure size in feedback oil circuit PS 2, 5 th functional valve and the functional valve of linking and the work fluid port of the functional valve of linking and the 9 th functional valve of linking; the power head motor is used for connecting and driving a drill rod of the pile driver, and two working oil ports of the power head motor are respectively connected with the two combined working oil ports of the 5 th functional valve group and the 9 th functional valve group;
One or a plurality of the 6 th-8 th functional valve groups are used on other mechanisms of the pile machine except the motor of the power head, the main control valves of the 6 th-8 th functional valve groups used on the other mechanisms of the pile machine except the motor of the power head are respectively and correspondingly 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 of the 6 th-8 th functional valve groups is used on the other mechanisms of the pile machine except the motor of the power head, the single shuttle valve corresponding to the one functional valve group is the regulating and controlling shuttle valve, when at least two of the 6 th-8 th functional valve groups are used on other mechanisms of the pile machine except a motor of the power head, the hydraulic control system of the pile machine with the adjustable speed of the power head further comprises a shuttle valve group which is commonly connected with left and right pilot oil ports of each functional valve group used in the 6 th-8 th functional valve group, the shuttle valve groups are multi-stage distributed shuttle valve groups with gradually decreasing numbers and in a tree-shaped connection structure, a first-stage shuttle valve is composed of shuttle valves connected with left and right pilot oil ports of each functional valve group used in the 6 th-8 th functional valve group, and a single shuttle valve of the last-stage shuttle valve is the regulation and control shuttle valve;
The feedback control valve is arranged on the feedback oil path PS 2, an oil outlet of the regulating and controlling shuttle valve is connected with a pilot oil port of the feedback control valve, the power head regulating and controlling pilot pressure source is connected with a working oil port of the feedback control valve, the feedback control valve is used for enabling the second displacement control valve to switch between receiving pressure fed back by the 6 th-9 th functional valve group and receiving pressure of the power head regulating and controlling pilot pressure source as feedback pressure, and the pressure of the power head regulating and controlling pilot pressure source is set to enable the displacement of the second main pump to be reduced to be minimum or to be a certain minimum required displacement, namely, the displacement of the second main pump which is originally combined with the first main pump and used for the power head motor is reduced so as to meet the low rotation speed requirement of the power head motor;
The regulating and controlling 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 regulating and controlling pilot pressure source when any one of the 6 th to 8 th functional valve groups is operated, and enabling the second displacement control valve to be restored to a state of being connected with the pressure fed back by the 6 th to 9 th functional valve groups, enabling the second main pump to restore normal displacement, and enabling a mechanism corresponding to any one of the 6 th to 8 th functional valve groups to obtain 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, wherein the working oil port E is connected with the power head regulating and controlling pilot pressure source, and the working oil port F is connected with a feedback oil path PS 2; when the feedback control valve I is positioned at the left position, the working oil port E is blocked, the working oil port F is communicated with the working oil port G, and when the feedback control valve I is positioned at the right position, the working oil port F is blocked, and the working oil port E is communicated with the working oil port G; the left pilot oil port of the first feedback control valve is connected with the oil outlet of the regulating and controlling shuttle valve, and the first feedback control valve is positioned at the right position when the regulating and controlling shuttle valve does not have pressure oil;
The feedback control valve II is provided with an oil port H, an oil port I and an oil port J, the oil port H is connected with a feedback oil path PS 2, the oil port I is connected with a feedback oil path PS 2, and the oil port J is connected with a working oil port G of the feedback control valve I; when the feedback control valve is positioned at the left position, the oil port H is blocked, the oil port I is communicated with the oil port J, and when the feedback control valve is positioned at the right position, the oil port J is blocked, and the oil port H is communicated with the oil port I; the feedback control valve II is positioned at the right position when no external control action exists;
preferably, the second feedback control valve adopts an electromagnetic valve, and the second feedback control valve is switched from the right position to the left position 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 functional valve group and the 9 th functional valve group are valve groups of the multi-way valve of the excavator for the bucket rod oil cylinder.
The invention has at least the following beneficial effects:
The invention is based on the 5 th joint of the multi-way valve of the excavator on the existing market to form the bucket rod valve group, and the 9 th joint valve is also arranged in the multi-way valve of the excavator to form the joint of the 5 th joint valve, so that large discharge capacity can be provided, the requirement of high rotating speed of a power head can be met, and the bucket rod oil cylinder valve group of the multi-way valve of the excavator is selected as a driving oil way of a motor of the power head. However, because the rotating speed requirements of the drill bit are different under different geological conditions, partial geological conditions are that low rotating speed is required, and sometimes the power head motor only needs single pump oil supply, but the 5 th and 9 th joints of the multi-way valve of the excavator are combined in the multi-way valve, and the single pump oil supply of the system cannot be realized through the pilot control of the valve. That is, if the bucket rod oil cylinder valve group of the existing multi-way valve of the excavator is directly used for controlling the 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 multi-way valve of the excavator and is used for driving and controlling the power head motor;
the invention improves the multi-way valve based on the prior excavator, adds the feedback control valve and a set of shuttle valve which are connected to the original interface of the multi-way valve of the excavator, can meet the speed regulation requirement of a motor of a power head, can not influence the operation of other valve groups (namely the 6 th to 8 th functional valve groups) related to a main pump, is connected to the outside of the multi-way valve of the excavator, does not need to change the internal structure of the multi-way valve of the excavator, namely does not need to disassemble and refit the complex valve group of the excavator of an internal pipeline, ensures that the valve group of the excavator with high cost performance can be smoothly and normally used on the valve group of the power head of the pile driver, effectively reduces the manufacturing cost of the pile driver machinery, and is mainly helpful for ensuring the stability of the quality of products. And can meet the speed regulation requirement of the power head.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a pile driver hydraulic control system with adjustable power head speed according to a preferred embodiment of the present invention (wherein the multi-way valve of the excavator is of prior art, and part of the pipeline of the multi-way valve of the excavator is not shown);
FIG. 2 is an enlarged view of the 5 th and 9 th functional valve sets of FIG. 1 of the present invention;
FIG. 3 is an enlarged view of the 6 th-8 th-up functional valve block of FIG. 1 according to the present invention;
Fig. 4 is an enlarged view of the primary pump one and the secondary pump two of fig. 1 and their associated piping in accordance with the present invention.
In the figure: the hydraulic control system comprises a 1-power head motor, a 2-excavator multi-way valve, a 201-throttle valve I, a 202-throttle valve II, a 21-function valve group I, a 22-function valve group II, a 23-function valve group III, a 24-function valve group IV, a 25-function valve group V, a 26-function valve group VI, a 260-reversing valve VI, a 27-function valve group VI, a 270-reversing valve seven, a 28-function valve group eight, a 280-reversing valve eight, a 29-function valve group VI, a 30-regulation shuttle valve, a 31-first-stage shuttle valve, a 32-second-stage shuttle valve, a 4-feedback control valve, a 41-feedback control valve I, a 42-feedback control valve II, a 5-power head regulation pilot pressure source, a 6-main pump I, a 60-displacement control valve I, a 61-displacement feedback device I, a 7-main pump II, a 70-displacement control valve II, a 71-displacement feedback device II and an 8-pilot pump.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawings, but the invention can be implemented in a number of different ways, which are defined and covered by the claims.
Referring to fig. 1 to 4, a pile machine hydraulic control system with adjustable power head speed comprises a power head motor 1, a multi-way valve 2 of a digging machine, a regulating and controlling shuttle valve 30, a feedback control valve 4, a power head regulating and controlling pilot pressure source 5, a main pump 1, a main pump two 7, a displacement control valve 60 and a displacement control valve two 70, wherein the multi-way valve of the digging machine comprises 9 functional valve groups, the 1 st to 5 functional valve groups are connected with a main pump to supply oil, the 6 th to 9 functional valve groups are connected with the main pump two to supply oil, and in the multi-way valve of the digging machine shown in fig. 1, the 1 st to 5 functional valve groups are respectively: 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: functional valve group six 26, functional valve group seven 27, functional valve group eight 28 and functional valve group nine 29.
The multi-way valve of the excavator comprises a feedback oil way PS 1 and a feedback oil way PS 2, wherein the feedback oil way PS 1 is connected between the 1 st to 5 th functional valve groups and a first displacement feedback device 61 of a first displacement control valve, the feedback oil way PS 2 is connected between the 6 th to 9 th functional valve groups and a second displacement feedback device 71 of a second displacement control valve, the first displacement control valve is used for adjusting the displacement of the first main pump according to the oil pressure in the feedback oil way PS 1, and the second displacement control valve is used for adjusting the displacement of the second main pump according to the oil pressure in the feedback oil way PS 2.
In this embodiment, the first and second displacement control valves are negative flow displacement control valves, and the multi-way valve of the excavator further includes a first throttle 201 and a second throttle 202 connected to the feedback oil path PS 1 and the feedback oil path PS 2, respectively. For the 6 th to 9 th valve group associated with the second main pump, the negative flow displacement control principle is as follows: when any one or more of the valve banks of the 6 th to 9 th valve banks work, the flow rate before the second throttle valve (i.e. the left end of the second throttle valve in fig. 1) is reduced, the pressure in the feedback oil path PS 2 behind the second throttle valve is correspondingly reduced, the feedback oil path PS 2 feeds back the pressure behind the second throttle valve (i.e. the right end of the second throttle valve in fig. 1) to the second displacement feedback device, and the second displacement feedback device respectively increases the displacement of the second main pump, and otherwise reduces the displacement of the second main pump. For the 1 st to 5 th functional valve groups associated with the first main pump, the control principle of the negative flow displacement 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 functional valve group and the 9 th functional valve group are combined by a multi-way valve of the excavator for the bucket rod oil cylinder, the 5 th functional valve group and the 9 th functional valve group are combined and arranged through working oil ports, and pilot oil ports of the 5 th functional valve group and the 9 th functional valve group are connected in parallel; the power head motor is used for connecting and driving a drill rod of the pile driver, 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 after being combined with a5 th functional valve group and a9 th functional valve group;
The 6 th to 8 th functional valve groups of the embodiment are all used on other mechanisms of the pile machine except a motor of a power head, the main control valves of the 6 th, 7 th and 8 th functional 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, 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 the three first-stage shuttle valves are connected to the oil inlets of the 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 shuttle valve 30),
In this embodiment, the feedback control valve is disposed on the feedback oil path PS 2, and in this 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, a first feedback control valve is provided with a working oil port E, a working oil port F, and a working oil port G, where the working oil port E is connected to the power head regulating pilot pressure source 5, and the working oil port F is connected to a feedback oil path PS 2; when the feedback control valve I is positioned at the left position, the working oil port E is blocked, the working oil port F is communicated with the working oil port G, and when the feedback control valve I is positioned at the right position, the working oil port F is blocked, and the working oil port E is communicated with the working oil port G; the left pilot oil port of the first feedback control valve is connected with the oil outlet of the regulating and controlling shuttle valve, and the first feedback control valve is positioned at the right position when the regulating and controlling shuttle valve does not have pressure oil;
Referring to fig. 1, in the present embodiment, a second feedback control valve is provided with an oil port H, an oil port I, and an oil port J, where the oil port H is connected to a feedback oil path PS 2, the oil port I is connected to a feedback oil path PS 2, and the oil port J is connected to 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 blocked, the oil port I is communicated with the oil port J, and when the feedback control valve is positioned at the right position, the oil port J is blocked, and the oil port H is communicated with the oil port I; the feedback control valve II is positioned at the right position when no external control action exists;
The pressure of the power head regulation pilot pressure source is set to enable the displacement of the second main pump to be reduced to be minimum or to be minimum required, and the power head regulation pilot pressure source can be specifically set to correspond to the minimum displacement of the second main pump, at the moment, the displacement of the second main pump can be regarded as being approximately equal to zero, and the power head motor is equivalent to only one pump of the first main pump for supplying oil. Of course, the pressure of the power head regulating pilot pressure source may be set to correspond to the displacement of the first main pump. The power head regulating and controlling pilot pressure source can be provided by another oil pump and an oil way, and the power head regulating and controlling pilot pressure source can be provided by combining the pilot pump 8 of the system as a power source with a certain oil way.
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 approximately as follows:
When the power head motor needs to rotate at a low speed and the 6 th to 8 th functional valve groups are not operated, the power head motor is supplied with oil by the first pump and the second pump, and the flow is overlarge, so that the displacement of the second pump needs to be reduced, an electromagnetic switch of the second feedback control valve is started, the second feedback control valve is switched to the left position, at the moment, the second displacement control valve 70 receives a pressure signal from a pilot pressure source regulated and controlled by the power head, and at the moment, the displacement of the second pump is minimum or is a certain value lower than the maximum displacement.
When the second displacement of the main pump is minimum or is at a certain value lower than the maximum displacement, if any one or more of the functional valve groups of the 6 th to 8 th functional valve groups need to act, the pilot handles of the corresponding reversing valve six 260, the reversing valve seven 270 or the reversing valve eight 280 are operated, so that the pressure oil output by the regulating and controlling shuttle valve can be converted to the left position, the feedback control valve is converted to the left position, at the moment, the connection between the second displacement control valve and the power head regulating and controlling pilot pressure source is interrupted, the second displacement control valve 70 is restored to a state of receiving a pressure signal from the rear end of the second throttle valve 202, the second main pump can timely increase the displacement according to the pressure of the rear end of the second throttle valve 202, the functional valve groups needing to act in the 6 th to 8 th functional valve groups can obtain the required flow, the functional valve groups needing to act and the 9 th functional valve groups share the flow of the second main pump together, and the rotating speed of the motor of the power head is moderate.
When the power head motor needs high rotation speed, the electromagnetic switch of the feedback control valve II is closed, the feedback control valve II returns to the right position, the displacement control valve II 70 returns to a state of receiving a pressure signal from the rear end of the throttle valve II 202, and the 6-8 functional valve groups are all closed at the moment, so that the main pump II supplies oil to the power head motor only to meet the high rotation speed requirement of the power head motor.
Description: the excavator multi-way valve in this embodiment adopts an excavator multi-way valve of KYB corporation of Japan. Because the multi-way valve of the excavator is a commonly-used known product in the market at present, the internal pipeline structure and the functional interface are nearly standardized, the complete internal pipeline connection structure of each valve group of the multi-way valve of the excavator is not shown in fig. 1 of the invention, and only part of pipelines relevant to the improvement point of the invention are shown. In addition, for convenience of description, the 9-linkage functional valve groups of the multi-way valve of the excavator are numbered 1-9, the functional valve group related to the first main pump is defined as the 1 st-5 th linkage, the functional valve group related to the second main pump is defined as the 6 th-9 th linkage, and the numbering mode of each linkage valve group of the multi-way valve of the excavator is not limited to the protection scope of the invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The pile machine hydraulic control system with the adjustable power head speed is characterized by comprising a power head motor (1), a multi-way valve (2) of an excavator, a regulating shuttle valve (30), a feedback control valve (4), a power head regulating pilot pressure source (5), a first main pump (6), a second main pump (7), a first displacement control valve (60) and a second displacement control valve (70), wherein the multi-way valve of the excavator comprises 9-linkage functional valve groups, the 1-5-linkage functional valve groups are connected with oil supply by the first main pump, the 6-9-linkage functional valve groups are connected with oil supply by the second main pump, the multi-way valve of the excavator comprises a feedback oil way PS 1 and a feedback oil way PS 2, the feedback oil way PS 1 is connected between the 1-5-linkage functional valve groups and the first displacement control valve, the first displacement control valve is used for regulating the first main pump according to the oil pressure in the feedback oil way PS 1, the feedback oil way PS 2 is connected between the 6-9-th linkage functional valve group and the second displacement control valve, the second displacement control valve is used for regulating the second main pump according to the oil pressure in the feedback oil way PS 2, and the work flow joint functional valve groups of the 5-linkage functional valve groups and the multi-linkage functional valve groups are combined with the first pump functional valve group and the second displacement control valve group; the power head motor is used for connecting and driving a drill rod of the pile driver, and two working oil ports of the power head motor are respectively connected with the two combined working oil ports of the 5 th functional valve group and the 9 th functional valve group;
One or a plurality of groups of 6-8 groups of functional valve groups are used on other mechanisms of the pile machine except a power head motor, a shuttle valve is correspondingly arranged on a main control valve of each functional valve group of the 6-8 groups of functional valve groups, which is used on the other mechanisms of the pile machine except the power head motor, left and right pilot oil ports of the main control valve of each functional valve group are respectively connected to two oil inlets of corresponding shuttle valves, when only one group of the 6-8 groups of functional valve groups is used on the other mechanisms of the pile machine except the power head motor, a single shuttle valve corresponding to the one group of functional valve groups is the regulating shuttle valve, when at least two groups of the 6-8 groups of functional valve groups are used on the other mechanisms of the pile machine except the power head motor, the hydraulic control system of the pile machine with adjustable power head speed also comprises shuttle valve groups which are commonly connected with left and right pilot oil ports of each of the connected shuttle valve groups of the plurality of functional valve groups, the shuttle valve groups are in a step-by-step descending number of shuttle valve groups, namely, the shuttle valve groups of the first shuttle valve groups are connected with the first shuttle valve groups of the first shuttle valve groups are the first shuttle valve groups, and the shuttle valve groups of the first shuttle valve groups are the shuttle valve groups of the last-step-by the shuttle valve groups are connected with the shuttle valve groups;
The feedback control valve is arranged on the feedback oil path PS 2, an oil outlet of the regulating and controlling shuttle valve is connected with a pilot oil port of the feedback control valve, the power head regulating and controlling pilot pressure source is connected with a working oil port of the feedback control valve, the feedback control valve is used for enabling the second displacement control valve to switch between receiving pressure fed back by the 6 th-9 th functional valve group and receiving pressure of the power head regulating and controlling pilot pressure source as feedback pressure, the pressure of the power head regulating and controlling pilot pressure source is set to enable the displacement of the second main pump to be reduced to be minimum or to be minimum required, namely, the displacement of the second main pump which is originally used for the power head motor after being combined with the first main pump is reduced, so that the low rotating speed requirement of the power head motor is met;
The regulating and controlling 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 regulating and controlling pilot pressure source when any one of the 6 th-8 th functional valve groups is operated, and enabling the second displacement control valve to be restored to a state of being connected with the pressure fed back by the 6 th-9 th functional valve group, enabling the second main pump to restore normal displacement, and enabling a mechanism corresponding to any one of the 6 th-8 th functional valve groups to obtain required flow;
the feedback control valve comprises a feedback control valve I (41) and a feedback control valve II (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, wherein the working oil port E is connected with the power head regulating and controlling pilot pressure source, and the working oil port F is connected with a feedback oil path PS 2; when the feedback control valve I is positioned at the left position, the working oil port E is blocked, the working oil port F is communicated with the working oil port G, and when the feedback control valve I is positioned at the right position, the working oil port F is blocked, and the working oil port E is communicated with the working oil port G; the left pilot oil port of the first feedback control valve is connected with the oil outlet of the regulating and controlling shuttle valve, and the first feedback control valve is positioned at the right position when the regulating and controlling shuttle valve does not have pressure oil;
The feedback control valve II is provided with an oil port H, an oil port I and an oil port J, the oil port H is connected with a feedback oil path PS 2, the oil port I is also connected with a feedback oil path PS 2, and the oil port J is connected with a working oil port G of the feedback control valve I; when the feedback control valve is positioned at the left position, the oil port H is blocked, the oil port I is communicated with the oil port J, and when the feedback control valve is positioned at the right position, the oil port J is blocked, and the oil port H is communicated with the oil port I; the feedback control valve II is positioned at the right position when no external control action exists.
2. The pile driver hydraulic control system with adjustable power head speed according to claim 1, wherein the second feedback control valve adopts an electromagnetic valve, and the second feedback control valve is switched from a right position to a left position by operating an electromagnetic switch.
3. The pile driver hydraulic control system with adjustable power head speed according to claim 1, wherein the first displacement control valve and the second displacement control valve are both negative flow displacement control valves.
4. The pile driver hydraulic control system with adjustable power head speed according to claim 1, wherein the 5 th functional valve group and the 9 th functional valve group are valve groups of a multi-way valve of the excavator for an arm cylinder.
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| CN201911382669.0A CN111022390B (en) | 2019-12-27 | 2019-12-27 | Pile machine hydraulic control system with adjustable power head speed |
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