CN107795278B - Speed limiting method for working device of pile driver and hydraulic speed limiting system - Google Patents
Speed limiting method for working device of pile driver and hydraulic speed limiting system Download PDFInfo
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- CN107795278B CN107795278B CN201711133709.9A CN201711133709A CN107795278B CN 107795278 B CN107795278 B CN 107795278B CN 201711133709 A CN201711133709 A CN 201711133709A CN 107795278 B CN107795278 B CN 107795278B
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- 230000007246 mechanism Effects 0.000 claims description 48
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- 230000001276 controlling effect Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
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- 238000010586 diagram Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
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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
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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
- F15B13/025—Pressure reducing valves
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Abstract
The invention provides a speed limiting method of a working device of a pile machine and a hydraulic speed limiting system, wherein the speed limiting method comprises the following steps: s1, operating a rotary motor to rotate through a rotary operating handle, wherein pressure oil in the middle of an A/B oil port of a working oil path of the rotary motor passes through a first rotary shuttle valve; s2, a pressure oil way with larger pressure in the middle of an oil port A/B is selected by the rotary shuttle valve to be communicated with an oil inlet of the pressure reducing valve; s3, after the pressure oil is reduced through the pressure reducing valve, opening the hydraulic control reversing valve through the pressure of the working oil way at the outlet of the pressure reducing valve, and entering the shuttle valve II; the shuttle valve II is connected to a pump variable piston of the hydraulic pump; s4, comparing the pressure N of the working oil way with the feedback pressure P of the hydraulic valve by the shuttle valve II, and enabling one path of pressure oil with high pressure to enter a pump variable piston of the hydraulic pump to regulate the displacement of the hydraulic pump; the speed of the working device is controlled. The invention has the advantages of convenient implementation, simple structure and low cost, and can well improve the operation safety performance of the pile machine and the adaptability to complex working conditions.
Description
Technical Field
The invention relates to a speed limiting method and a hydraulic speed limiting system, in particular to a speed limiting method and a hydraulic speed limiting system of a working device of a pile driver, and especially relates to a speed limiting method and a hydraulic speed limiting system of a working device of a pile driver based on negative flow hydraulic control.
Background
The pile driver is one kind of pile driving machine for pile driving, and the pile is driven into stratum with impact force for high-speed railway construction. The market analysis and investment prospect research report of the Chinese pile machine industry in 2012-2016 shows that: pile machines are of various varieties, the most commonly used ones: screw pile driver, diesel hammer pile driver, positive and negative circulation drilling machine, percussion drilling machine, board-inserting machine and ramming pile-expanding machine.
The pile machine is generally composed of a pile hammer, a pile frame, a column, an inclined strut, a chassis, a travelling mechanism, a slewing mechanism, a hoisting mechanism, an operating room, a hydraulic system, an electric system and the like. The pile hammer is attached between two parallel vertical guide rods (commonly called a gantry) at the front part of the pile frame and is used for lifting the lifting hook. The pile frame is a steel structure tower, and a windlass is arranged at the rear part of the pile frame and used for hoisting piles and piles hammers. The front of the pile frame is provided with a guide frame consisting of two guide rods, which is used for controlling the piling direction so that the pile can accurately penetrate into the stratum according to the designed direction. The basic technical parameters of the pile driver are the impact section weight, the impact kinetic energy and the impact frequency. The power source for the pile hammer to move can be divided into drop hammer, steam hammer, diesel hammer, hydraulic hammer, etc., and a special rotary mechanism is generally arranged on the pile driver to facilitate rotation.
However, current pile drivers generally employ a set of negative flow control valves to control all of the actions separately, which can easily result in excessive speed when turning around because of the large flow required by the working device. The current limiting system for the rotation speed of the rotation mechanism controls the rotation speed of the rotation mechanism by limiting the operation travel of the hydraulic handle, but the scheme has obvious defects that: the rotation pressure cannot reach the set pressure due to the neutral return oil of the negative flow, and the rotation action cannot be executed under certain working conditions requiring large torque rotation.
In addition, there are forced throttling and surplus flow overflows through overflow valves to achieve turning action, but this solution has the disadvantage that the system heats up seriously, affecting the service life of the equipment.
The following two comparison documents disclose two types of revolution systems and control methods for controlling revolution speed:
comparative document 1: CN103669463B discloses an acceleration control method and device for a hydraulic swing system and an excavator. The acceleration control method comprises the following steps: step 10, obtaining the current pressure of the rotary pump; step 20, judging the relation between the current pressure and the threshold pressure, and executing step 30 under the condition that the current pressure is greater than the threshold pressure; step 30, reducing the flow control current of the rotary pump by a first preset value to obtain the flow control current of the next control so as to control the flow of the rotary pump; step 40, steps 10 to 30 are performed in a loop until the current pressure is less than or equal to the threshold pressure.
Comparison document 2: CN103527073B discloses a rotary drilling rig control rotary hydraulic circuit system, which comprises a main pump, wherein the main pump is communicated with a main control valve through a pipeline, and the main control valve is respectively communicated with a pilot handle and a rotary motor through pipelines; the main pump is communicated with the main control valve through a pipeline, and the rotary speed reducing device is communicated with the main control valve through a pipeline.
Disclosure of Invention
The invention aims to solve the technical problem of providing a speed limiting method and a hydraulic speed limiting system for a working device of a pile driver, wherein the working device comprises a slewing mechanism and a hoisting mechanism; the speed limiting method and the hydraulic speed limiting system achieve the purpose of limiting the maximum speed of the working device of the pile machine by limiting the pump displacement.
In order to solve the technical problems, the invention adopts the following technical scheme:
the speed limiting method for the working device of the pile machine is provided, the working device is a slewing mechanism of the pile machine, and the method specifically comprises the following steps:
s1, arranging a shuttle valve I in the middle of an A/B oil port of a working oil way of a rotary motor of a rotary mechanism; the rotary motor is correspondingly provided with an operating handle; when the hydraulic pump works, the rotary motor is operated to rotate through the operating handle, the hydraulic pump discharges pressure oil to the operating handle, and the control pressure is transmitted to the rotary multi-way valve; the pressure oil in the middle of the A/B oil port of the working oil way of the rotary motor passes through a shuttle valve I;
s2, a pressure oil way with larger pressure in the A/B oil port is selected by the shuttle valve to be communicated with an oil inlet of the pressure reducing valve;
s3, after the pressure oil is reduced through the pressure reducing valve, opening a hydraulic control reversing valve through the pressure of a working oil way at an outlet of the pressure reducing valve, and then enabling the pressure oil to enter a shuttle valve II through the hydraulic control reversing valve; the shuttle valve II is connected to a pump variable piston of the hydraulic pump;
s4, setting the pressure of the working oil way decompressed by the decompression valve in the step S3 as N; the feedback pressure of the rotary multi-way valve is P; the feedback pressure P changes according to the amplitude change of the operation handle, and the larger the operation amplitude of the operation handle is, the smaller the feedback pressure P is; conversely, the larger;
the shuttle valve II compares the pressure N with the feedback pressure P, and one path of pressure oil with large pressure enters a pump variable piston of the hydraulic pump to regulate the displacement of the hydraulic pump; when N is more than P, the pressure oil corresponding to the pressure N directly controls the variable piston plunger of the hydraulic pump, thereby controlling the displacement of the hydraulic pump and realizing the speed control of the working device.
Further, the method comprises the steps of,
when the operation handle does not act, the feedback pressure P of the rotary multi-way valve is maximum, and the output flow Q of the pump is smaller at the moment;
when the handle is operated to the maximum position, the feedback pressure P of the hydraulic valve approaches 0, and the output flow Q of the pump is larger.
The pressure N can be regulated by regulating the pressure reducing valve, and referring to the third drawing, the regulating section 1< N <4 of the pressure N. When the operating handle is in an initial operating stage, the feedback pressure P of the hydraulic valve is larger than the pressure N; when the feedback pressure P is smaller than N, the maximum output flow rate of the hydraulic pump is the flow rate Q corresponding to N, and thus, the maximum output flow rate of the hydraulic pump can be regulated by regulating the pressure N, thereby limiting the maximum speed of the swing mechanism.
Further, the method comprises the steps of,
the speed limiting method can also be applied to a hoisting mechanism of a pile machine, namely: the working device is a hoisting mechanism, and the speed limiting method of the hoisting mechanism specifically comprises the following steps:
s1, arranging a shuttle valve I in the middle of an A/B oil port of a winch motor working oil way of a winch mechanism; the winch motor is correspondingly provided with an operating handle; when the hydraulic pump works, the winch motor is operated to rotate through the operating handle, the hydraulic pump discharges pressure oil to the operating handle, and control pressure is transmitted to the winch multi-way valve; the pressure oil in the middle of the A/B oil port of the working oil way of the winch motor passes through a shuttle valve I;
s2, a pressure oil circuit with larger pressure in an A/B oil port of the working oil circuit of the hoisting motor is selected by the shuttle valve and is communicated with an oil inlet of the pressure reducing valve;
s3, after the pressure oil is reduced through the pressure reducing valve, opening a hydraulic control reversing valve through the pressure of a working oil way at an outlet of the pressure reducing valve, and then enabling the pressure oil to enter a shuttle valve II through the hydraulic control reversing valve; the shuttle valve II is connected to a pump variable piston of the hydraulic pump;
s4, setting the pressure of the working oil way decompressed by the decompression valve in the step S3 as N; the feedback pressure of the hoisting multi-way valve is P; the feedback pressure P changes according to the amplitude change of the operation handle, and the larger the operation amplitude of the operation handle is, the smaller the feedback pressure P is; conversely, the larger;
the shuttle valve II compares the pressure N with the feedback pressure P, and one path of pressure oil with large pressure enters a pump variable piston of the hydraulic pump to regulate the displacement of the hydraulic pump; when N is more than P, the pressure oil corresponding to the pressure N directly controls the variable piston plunger of the hydraulic pump, thereby controlling the displacement of the hydraulic pump and realizing the speed control of the working device.
Further, the method comprises the steps of,
when the operating handle does not act, the feedback pressure P of the hoisting multi-way valve is maximum, and the output flow Q of the hydraulic pump is smaller at the moment;
when the operating handle reaches the maximum position, the feedback pressure P of the winch multi-way valve is close to 0, and the output flow Q of the hydraulic pump is larger.
The speed limiting principle of the hoisting mechanism is the same as that of the slewing mechanism.
The invention also provides a hydraulic speed limiting system adopting the speed limiting method of the working device of the pile machine, wherein the working device of the pile machine comprises a slewing mechanism, and the hydraulic speed limiting system of the slewing mechanism comprises:
the hydraulic pump, the rotary multi-way valve unit, the first shuttle valve, the rotary motor, the pressure reducing valve, the hydraulic control reversing valve, the pump variable piston and the second shuttle valve; the rotary multi-way valve is connected with the rotary motor through the rotary multi-way valve; the rotary motor is correspondingly provided with an operating handle;
the shuttle valve I is arranged in the middle of an A/B port of a working oil circuit of the rotary motor;
the shuttle valve I is used for selecting a larger pressure oil way in an A/B port of the working oil way of the rotary motor and is connected to an oil inlet of the pressure reducing valve;
the pressure oil way of the oil outlet of the pressure reducing valve comprises two ways: one path is communicated with an oil inlet of the hydraulic control reversing valve, and the other path is communicated with a control port of the hydraulic control reversing valve;
an oil outlet of the hydraulic control reversing valve is connected with one end of a second shuttle valve, and the other end of the second shuttle valve is connected with a pump variable piston of the hydraulic pump.
Further, the method comprises the steps of,
the working device of the pile driver also comprises a hoisting mechanism; the hydraulic speed limiting system of the hoisting mechanism comprises:
the hydraulic pump, the winch multi-way valve, the shuttle valve I, the winch motor, the pressure reducing valve, the hydraulic control reversing valve, the pump variable piston and the shuttle valve II; the hydraulic pump is connected with the winch motor through the winch multi-way valve; the winch motor is correspondingly provided with an operating handle;
the shuttle valve I is arranged in the middle of an A/B port of a working oil circuit of the winch motor;
the shuttle valve I is used for selecting a larger pressure oil way in an A/B port of the working oil way of the winch motor and is connected to an oil inlet of the pressure reducing valve;
the pressure oil way of the oil outlet of the pressure reducing valve comprises two ways: one path is communicated with an oil inlet of the hydraulic control reversing valve, and the other path is communicated with a control port of the hydraulic control reversing valve;
an oil outlet of the hydraulic control reversing valve is connected with one end of a second shuttle valve, and the other end of the second shuttle valve is connected with a pump variable piston of the hydraulic pump.
The invention also provides a pile driver with negative flow hydraulic control, which comprises a slewing mechanism and a hoisting mechanism, wherein the slewing mechanism adopts the hydraulic speed limiting system.
Further, the method comprises the steps of,
the hoisting mechanism in the pile machine controlled by the negative flow hydraulic pressure adopts the hydraulic speed limiting system.
When the working device of the pile machine is operated to rotate, the pressure oil of the rotating oil way of the working device can control the pump displacement through the scheme provided by the invention, and the rotating speed of the working device (comprising a rotating mechanism, a motor mechanism and the like) can be regulated to a reasonable working interval.
The invention has the advantages of convenient implementation, simple structure and low cost, and can well improve the operation safety performance of the pile machine and the adaptability to complex working conditions.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hydraulic control system of a prior art pile driver working device;
FIG. 2 is a schematic diagram of a hydraulic speed limiting system of a pile driver working device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the hydraulic speed limiting system of the pile driver working device according to an embodiment of the present invention;
the above reference numerals:
the hydraulic pump 1', the rotary multi-way valve unit 2', the rotary motor 4', the power head multi-way valve unit 5', the power head motor 6', and the pump variable piston 9';
the hydraulic pump 1, the rotary multi-way valve unit 2, the rotary shuttle valve I3, the rotary motor 4, the hoisting multi-way valve unit 5, the hoisting motor 6, the pressure reducing valve 7, the hydraulic control reversing valve 8, the pump variable piston 9 and the shuttle valve II 10;
b is a working oil crossing of a rotary motor (winding motor); a. b is a working oil port of the rotary multi-way valve; c. d is a working oil port of the hoisting multi-way valve;
q is the flow of the hydraulic pump; c is the flow curve of the hydraulic pump; d is a hydraulic pump power curve; p is the feedback pressure; p2 is the pressure of the working oil passage.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, the hydraulic control system of the existing pile working device includes: the hydraulic pump 1', the rotary multi-way valve unit 2', the rotary motor 4', the power head multi-way valve unit 5', the power head motor 6', and the pump variable piston 9';
the hydraulic control system provided by the embodiment can not automatically complete the control of the maximum speed of the working device (a slewing mechanism and a hoisting mechanism) of the pile driver, and can greatly influence the service life of equipment, so that the service life of the equipment is greatly reduced.
Example 2
As shown in fig. 2-3, the present embodiment provides a pile machine adopting negative flow hydraulic control, including a swing mechanism, a winding mechanism, etc.; the slewing mechanism adopts the following hydraulic speed limiting system, and specifically comprises:
the hydraulic pump 1, the rotary multi-way valve unit 2, the shuttle valve I3, the rotary motor 4, the hoisting multi-way valve unit 5, the hoisting motor 6, the pressure reducing valve 7, the hydraulic control reversing valve 8, the pump variable piston 9 and the shuttle valve II 10;
the shuttle valve I3 is arranged in the middle of an A/B port of a rotary working oil way of the rotary motor 4; the shuttle valve I3 is used for selecting a larger pressure oil way in the middle of an A/B port of the working oil way of the rotary motor 4 and is connected to an oil inlet of the pressure reducing valve 7;
the pressure oil path of the oil outlet of the pressure reducing valve 7 includes two paths: one path is communicated with an oil inlet of the hydraulic control reversing valve 8, and the other path is communicated with a control port of the hydraulic control reversing valve 8;
an oil outlet of the hydraulic control reversing valve 8 is connected with one end of a shuttle valve II 10, and the other end of the shuttle valve II 10 is connected with a pump variable piston 9 of the hydraulic pump 1.
The speed limiting method of the hydraulic speed limiting system specifically comprises the following steps:
s1, arranging a shuttle valve I3 in the middle of an A/B oil port of a working oil way of a rotary motor 4 of a rotary mechanism; the rotary motor 4 is correspondingly provided with an operating handle; during operation, the rotary motor 4 is operated to rotate through the rotary operation handle, the hydraulic pump 1 discharges pressure oil to the operation handle, and control pressure is transmitted to the rotary multi-way valve assembly 2; the pressure oil in the middle of the A/B oil port of the working oil path of the rotary motor 4 passes through a shuttle valve I3;
s2, selecting a pressure oil way with larger pressure in an A/B oil port to be communicated with an oil inlet of a pressure reducing valve 7 by a shuttle valve I3;
s3, after the pressure oil is reduced through the pressure reducing valve 7, opening the hydraulic control reversing valve 8 through the pressure of a working oil way at the outlet of the pressure reducing valve 7, and then entering the shuttle valve II 10 through the hydraulic control reversing valve 8; the shuttle valve II 10 is connected to the pump variable piston 9 of the hydraulic pump 1;
s4, setting the pressure of the working oil way decompressed by the decompression valve 7 in the step S3 as N; the feedback pressure of the rotary multi-way valve unit 2 is P; the feedback pressure P is changed according to the amplitude change of the rotary operation handle; the larger the operation amplitude of the operation handle is, the smaller the feedback pressure P is; conversely, the larger;
the shuttle valve II 10 compares the pressure N with the feedback pressure P, and one path of pressure oil with large pressure enters the pump variable piston 9 of the hydraulic pump 1 to regulate the displacement of the hydraulic pump 1; when N > P, the pressure oil corresponding to the pressure N directly controls the plunger of the pump variable piston 9 of the hydraulic pump 1, thereby controlling the displacement of the hydraulic pump 1 and realizing the speed control of the working device.
Specifically, the working principle of the present embodiment is specifically described with reference to fig. 2 and 3:
in fig. 3, P2 refers to the start pressure of the working oil passage, and the pressure N is obtained after the pressure is reduced by the pressure reducing valve 7.
In order to limit the maximum speed of the swing motor 4, the principle of the present embodiment will be described with reference to the accompanying drawings according to the control principle of negative flow hydraulic control:
when in fig. 2, assuming that the engine speed is unchanged, the swing motor 4 is operated by the operating handle, the feedback pressure P of the swing multiplex valve train 2 is changed according to the amplitude change of the swing operating handle, the feedback pressure P of the swing multiplex valve train 2 is changed between the intervals 1 to 4 of fig. 3, assuming that the feedback pressure P of the swing multiplex valve train 2 is the maximum value of 4 of fig. 3, and the swing operating handle does not operate, the feedback pressure P of the swing multiplex valve train 2 is 4, the larger the amplitude of the swing operating handle is, the smaller the feedback pressure P of the swing multiplex valve train 2 is, and the feedback pressure P of the swing multiplex valve train 2 approaches 0 when the swing operating handle reaches the maximum position, and at this time, the output flow Q of the hydraulic pump 1 is larger, and the output flow Q of the hydraulic pump 1 is shown by the left C curve of fig. 3.
When the rotary motor 4 is operated, the pressure at the oil inlet end of a working oil path of the rotary motor 4 enters the pressure reducing valve 7 through the rotary shuttle valve I3, the hydraulic control reversing valve 8 is opened by the pressure N at the outlet of the pressure reducing valve 7, the hydraulic control reversing valve 8 enters the shuttle valve II 10, the shuttle valve II 10 compares the pressure N with the feedback pressure P of the rotary multi-way valve 2, the pressure N (which can be set to any value between 1 and 4 of the left graph of the figure 3) can be regulated through regulating the pressure reducing valve 7, when the rotary operating handle is in the initial operating stage, the pressure P is larger than N, the output flow Q of the hydraulic pump 1 is the left curve of the figure 3, and when the pressure P is smaller than N, the maximum output flow Q of the hydraulic pump 1 is the flow Q corresponding to N, and the maximum output flow of the hydraulic pump 1 can be regulated according to the regulation of N, so that the maximum speed of the rotary mechanism is limited.
In fig. 3, the maximum flow curve intersects the power curve D and is the variable point of the pump. As the swing pressure continues to increase, the speed of the swing will operate according to power curve D as the pump power exceeds the pump set power variable point.
Example 3
The difference between this embodiment and embodiment 2 is that the rotary shuttle valve 3 in embodiment 1 is disposed in the middle of the a/B port of the rotary working oil path of the hoist motor, that is, the technical solution of embodiment 1 is applied to the hoist motor loop of fig. 2; the first shuttle valve is used for selecting a larger pressure oil way in the middle of an A/B port of a working oil way of the rotary motor and is connected to an oil inlet of the pressure reducing valve, and the hydraulic speed limiting system is used for limiting the maximum speed of the hoisting mechanism by adjusting the maximum output flow of the hydraulic pump and is used for limiting the speed of the hoisting mechanism. The specific working principle is similar to that of example 1.
When the working device of the pile machine is operated, the pressure oil of the working circuit of the motor corresponding to the working device (comprising the slewing mechanism, the hoisting mechanism and the like in the embodiment) can control the pump displacement through the scheme provided by the invention, and the speed of the working device can be regulated to a reasonable working interval by regulating the displacement of the hydraulic pump.
The invention has the advantages of convenient implementation, simple structure and low cost, and can well improve the operation safety performance of the pile machine and the adaptability to complex working conditions.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The speed limiting method for the working device of the pile driver is characterized in that the working device is a slewing mechanism of the pile driver, and specifically comprises the following steps:
s1, arranging a shuttle valve I in the middle of an A/B oil port of a working oil way of a rotary motor of a rotary mechanism; the rotary motor is correspondingly provided with an operating handle; when the hydraulic pump works, the rotary motor is operated to rotate through the operating handle, the hydraulic pump discharges pressure oil to the operating handle, and the control pressure is transmitted to the rotary multi-way valve; the pressure oil in the middle of the A/B oil port of the working oil way of the rotary motor passes through a shuttle valve I;
s2, a pressure oil way with larger pressure in the A/B oil port is selected by the shuttle valve to be communicated with an oil inlet of the pressure reducing valve;
s3, after the pressure oil is reduced through the pressure reducing valve, opening a hydraulic control reversing valve through the pressure of a working oil way at an outlet of the pressure reducing valve, and then enabling the pressure oil to enter a shuttle valve II through the hydraulic control reversing valve; the shuttle valve II is connected to a pump variable piston of the hydraulic pump;
s4, setting the pressure of the working oil way decompressed by the decompression valve in the step S3 as N; the feedback pressure of the rotary multi-way valve is P; the feedback pressure P changes according to the amplitude change of the operation handle, and the larger the operation amplitude of the operation handle is, the smaller the feedback pressure P is; conversely, the larger;
the shuttle valve II compares the pressure N with the feedback pressure P, and one path of pressure oil with large pressure enters a pump variable piston of the hydraulic pump to regulate the displacement of the hydraulic pump; when N is more than P, the pressure oil corresponding to the pressure N directly controls the variable piston plunger of the hydraulic pump, thereby controlling the displacement of the hydraulic pump and realizing the speed control of the working device.
2. The method for limiting speed of a driving device of a pile driver according to claim 1,
when the operation handle does not act, the feedback pressure P of the rotary multi-way valve is maximum, and the output flow Q of the pump is smaller at the moment;
when the handle is operated to the maximum position, the feedback pressure P of the hydraulic valve approaches 0, and the output flow Q of the pump is larger;
the pressure N can be regulated by regulating the pressure reducing valve, and when the operating handle is in an initial operating stage, the feedback pressure P of the hydraulic valve is larger than the pressure N; when the feedback pressure P is smaller than N, the maximum output flow rate of the hydraulic pump is the flow rate Q corresponding to N, and thus, the maximum output flow rate of the hydraulic pump can be regulated by regulating the pressure N, thereby limiting the maximum speed of the swing mechanism.
3. The method for limiting speed of a driving device of a pile driver according to claim 1,
the working device is a hoisting mechanism, and the speed limiting method of the hoisting mechanism specifically comprises the following steps:
s1, arranging a shuttle valve I in the middle of an A/B oil port of a winch motor working oil way of a winch mechanism; the winch motor is correspondingly provided with an operating handle; when the hydraulic pump works, the winch motor is operated to rotate through the operating handle, the hydraulic pump discharges pressure oil to the operating handle, and control pressure is transmitted to the winch multi-way valve; the pressure oil in the middle of the A/B oil port of the working oil way of the winch motor passes through a shuttle valve I;
s2, a pressure oil circuit with larger pressure in an A/B oil port of the working oil circuit of the hoisting motor is selected by the shuttle valve and is communicated with an oil inlet of the pressure reducing valve;
s3, after the pressure oil is reduced through the pressure reducing valve, opening a hydraulic control reversing valve through the pressure of a working oil way at an outlet of the pressure reducing valve, and then enabling the pressure oil to enter a shuttle valve II through the hydraulic control reversing valve; the shuttle valve II is connected to a pump variable piston of the hydraulic pump;
s4, setting the pressure of the working oil way decompressed by the decompression valve in the step S3 as N; the feedback pressure of the hoisting multi-way valve is P; the feedback pressure P changes according to the amplitude change of the operation handle, and the larger the operation amplitude of the operation handle is, the smaller the feedback pressure P is; conversely, the larger;
the shuttle valve II compares the pressure N with the feedback pressure P, and one path of pressure oil with large pressure enters a pump variable piston of the hydraulic pump to regulate the displacement of the hydraulic pump; when N is more than P, the pressure oil corresponding to the pressure N directly controls the variable piston plunger of the hydraulic pump, thereby controlling the displacement of the hydraulic pump and realizing the speed control of the working device.
4. A hydraulic speed limiting system for a working device of a pile driver employing the speed limiting method for the working device of any one of claims 1 to 3, wherein the working device of the pile driver includes a swing mechanism, and the hydraulic speed limiting system for the swing mechanism includes:
the hydraulic pump, the rotary multi-way valve unit, the first shuttle valve, the rotary motor, the pressure reducing valve, the hydraulic control reversing valve, the pump variable piston and the second shuttle valve; the rotary multi-way valve is connected with the rotary motor through the rotary multi-way valve; the rotary motor is correspondingly provided with an operating handle;
the shuttle valve I is arranged in the middle of an A/B port of a working oil circuit of the rotary motor;
the shuttle valve I is used for selecting a larger pressure oil way in an A/B port of the working oil way of the rotary motor and is connected to an oil inlet of the pressure reducing valve;
the pressure oil way of the oil outlet of the pressure reducing valve comprises two ways: one path is communicated with an oil inlet of the hydraulic control reversing valve, and the other path is communicated with a control port of the hydraulic control reversing valve;
an oil outlet of the hydraulic control reversing valve is connected with one end of a second shuttle valve, and the other end of the second shuttle valve is connected with a pump variable piston of the hydraulic pump.
5. The hydraulic speed limiting system of the pile driver working device according to claim 4, wherein,
the working device of the pile driver also comprises a hoisting mechanism; the hydraulic speed limiting system of the hoisting mechanism comprises:
the hydraulic pump, the winch multi-way valve, the shuttle valve I, the winch motor, the pressure reducing valve, the hydraulic control reversing valve, the pump variable piston and the shuttle valve II;
the hydraulic pump is connected with the winch motor through the winch multi-way valve; the winch motor is correspondingly provided with an operating handle;
the shuttle valve I is arranged in the middle of an A/B port of a working oil circuit of the winch motor;
the shuttle valve I is used for selecting a larger pressure oil way in an A/B port of the working oil way of the winch motor and is connected to an oil inlet of the pressure reducing valve;
the pressure oil way of the oil outlet of the pressure reducing valve comprises two ways: one path is communicated with an oil inlet of the hydraulic control reversing valve, and the other path is communicated with a control port of the hydraulic control reversing valve;
an oil outlet of the hydraulic control reversing valve is connected with one end of a second shuttle valve, and the other end of the second shuttle valve is connected with a pump variable piston of the hydraulic pump.
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