CN117267185A - Engineering machinery and energy-saving control system for starting braking of slewing drive mechanism of engineering machinery - Google Patents

Engineering machinery and energy-saving control system for starting braking of slewing drive mechanism of engineering machinery Download PDF

Info

Publication number
CN117267185A
CN117267185A CN202311345791.7A CN202311345791A CN117267185A CN 117267185 A CN117267185 A CN 117267185A CN 202311345791 A CN202311345791 A CN 202311345791A CN 117267185 A CN117267185 A CN 117267185A
Authority
CN
China
Prior art keywords
oil
valve
communicated
port
hydraulic motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311345791.7A
Other languages
Chinese (zh)
Inventor
朱建新
李赛白
戴鹏
沈超
唐中勇
李想
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sunward Intelligent Equipment Co Ltd
Original Assignee
Sunward Intelligent Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sunward Intelligent Equipment Co Ltd filed Critical Sunward Intelligent Equipment Co Ltd
Priority to CN202311345791.7A priority Critical patent/CN117267185A/en
Publication of CN117267185A publication Critical patent/CN117267185A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • 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
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • F15B13/027—Check valves
    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention discloses engineering machinery and a rotary driving mechanism starting and braking energy-saving control system thereof, comprising an oil pump, a hydraulic motor, a first energy accumulator, an oil way switching valve, a first reversing valve and an oil return check valve; the first accumulator is communicated with a first oil inlet of the oil way switching valve, the oil outlet of the oil pump is communicated with a second oil inlet of the oil way switching valve, and the oil outlet of the oil way switching valve is communicated with the oil inlet of the first reversing valve; the oil return port of the first reversing valve is communicated with the oil tank, the first working oil port of the first reversing valve is communicated with one end of the hydraulic motor, and the second working oil port is communicated with the other end of the hydraulic motor; the first oil inlet of the oil return check valve is communicated with an oil port at one end of the hydraulic motor, the second oil inlet of the oil return check valve is communicated with an oil port at the other end of the hydraulic motor, and the oil outlet of the oil return check valve is communicated with an oil port of the first energy accumulator. The invention can realize energy recovery in the starting and braking process of the rotary driving mechanism of the engineering machinery, avoid energy overflow loss and reduce system energy waste.

Description

Engineering machinery and energy-saving control system for starting braking of slewing drive mechanism of engineering machinery
Technical Field
The invention relates to the technical field of hydraulic pressure, in particular to a braking energy-saving control system for a rotary driving mechanism. The invention also relates to engineering machinery.
Background
Engineering machinery such as an excavator, a rotary drilling rig, a crane and the like plays an important role in foundation construction, bridge tunnel construction, mining and hydraulic engineering construction. Hydraulic transmissions are widely used in construction machines due to their high power density, high torque capacity and good load capacity.
At present, a rotary driving mechanism is arranged on a vehicle body of engineering machinery such as an excavator, a rotary drilling machine and the like so as to drive the machine body or other parts to perform rotary motion.
In the prior art, a rotary driving mechanism of engineering machinery such as an excavator mainly adopts a transmission chain structure with a hydraulic motor and a gear reducer matched with each other, and because a machine body of the engineering machinery is heavy, inertia is large, and load is usually large, a hydraulic control system of the rotary driving mechanism has serious overflow loss in the starting or braking process. Specifically, when the rotary driving mechanism is started, the rotary platform has large inertia, the rotary acceleration is slower, the supply flow of the hydraulic pump is larger than the flow required by the rotation of the hydraulic motor, and the surplus flow overflows from the overflow valve to cause energy loss; when the rotary driving mechanism brakes, the large inertia rotary platform still keeps moving trend at the moment of braking due to the action of rotary inertia, so that the braking side pressure of the hydraulic motor exceeds the set pressure of the safety valve, and serious braking overflow energy loss is generated.
Therefore, how to realize energy recovery in the starting and braking process of the slewing drive mechanism of the engineering machinery, avoiding energy overflow loss and reducing system energy waste is a technical problem faced by the person skilled in the art.
Disclosure of Invention
The invention aims to provide an energy-saving control system for starting and braking of a rotary driving mechanism, which can realize energy recovery in the starting and braking process of the rotary driving mechanism of engineering machinery, avoid energy overflow loss and reduce system energy waste. Another object of the present invention is to provide a construction machine.
In order to solve the technical problems, the invention provides a rotary driving mechanism starting and braking energy-saving control system which comprises an oil pump, a hydraulic motor, a first energy accumulator, an oil way switching valve, a first reversing valve and an oil return check valve;
an oil port of the first energy accumulator is communicated with a first oil inlet of the oil way switching valve, an oil outlet of the oil pump is communicated with a second oil inlet of the oil way switching valve, and an oil outlet of the oil way switching valve is communicated with an oil inlet of the first reversing valve;
the oil return port of the first reversing valve is communicated with an oil tank, the first working oil port of the first reversing valve is communicated with an oil port at one end of the hydraulic motor, and the second working oil port of the first reversing valve is communicated with an oil port at the other end of the hydraulic motor;
the first oil inlet of the oil return check valve is communicated with an oil port at one end of the hydraulic motor, the second oil inlet of the oil return check valve is communicated with an oil port at the other end of the hydraulic motor, and the oil outlet of the oil return check valve is communicated with an oil port of the first energy accumulator;
the oil way switching valve is used for enabling one of the first energy accumulator and the oil pump to be communicated with an oil inlet of the first reversing valve;
the first reversing valve is used for stopping an oil inlet of the first reversing valve or conducting one of the first working oil port and the second working oil port of the first reversing valve, and stopping an oil outlet of the first reversing valve or conducting one of the first working oil port and the second working oil port of the first reversing valve;
the oil return check valve is used for enabling oil ports at two ends of the hydraulic motor to be in one-way conduction with the first energy accumulator.
Preferably, the device further comprises a second accumulator, a first one-way valve and a second one-way valve;
the oil ports of the second energy accumulator are simultaneously communicated with the oil ports at two ends of the hydraulic motor, and are used for supplementing oil to the oil port at one end of the hydraulic motor when the rotary driving mechanism brakes;
the first one-way valve is connected between the oil port of the second energy accumulator and the oil port of one end of the hydraulic motor, and the non-return end of the first one-way valve is communicated with the oil port of one end of the hydraulic motor; the second one-way valve is connected between the oil port of the second energy accumulator and the oil port of the other end of the hydraulic motor, and the non-return end of the second one-way valve is communicated with the oil port of the other end of the hydraulic motor.
Preferably, the valve further comprises a first switch valve;
one end of the first switch valve is communicated with the oil port of the second energy accumulator, and the other end of the first switch valve is communicated with the public oil port of the first check valve and the public oil port of the second check valve.
Preferably, the oil return check valve comprises a third check valve and a fourth check valve;
the third one-way valve is connected between an oil port at one end of the hydraulic motor and an oil port of the first energy accumulator, and the non-return end of the third one-way valve is communicated with the oil port at one end of the hydraulic motor;
the fourth one-way valve is connected between the oil port at the other end of the hydraulic motor and the oil port of the first energy accumulator, and the non-return end of the fourth one-way valve is communicated with the oil port at the other end of the hydraulic motor.
Preferably, the oil return check valve is a first shuttle valve;
the first oil inlet of the first shuttle valve is communicated with an oil port at one end of the hydraulic motor, the second oil inlet of the first shuttle valve is communicated with an oil port at the other end of the hydraulic motor, and the oil outlet of the first shuttle valve is communicated with an oil port of the first energy accumulator.
Preferably, the oil way switching valve is a two-position three-way reversing valve;
when the two-position three-way reversing valve is in the first station, the first oil inlet of the two-position three-way reversing valve is communicated with the oil outlet of the two-position three-way reversing valve, and the second oil inlet of the two-position three-way reversing valve is cut off; when the two-position three-way reversing valve is in the second station, the first oil inlet of the two-position three-way reversing valve is cut off, and the second oil inlet of the two-position three-way reversing valve is communicated with the oil outlet of the two-position three-way reversing valve.
Preferably, the oil path switching valve includes a second switching valve and a third switching valve;
one end of the second switch valve is communicated with an oil port of the first energy accumulator, and the other end of the second switch valve is communicated with an oil inlet of the first reversing valve;
one end of the third switch valve is communicated with an oil outlet of the oil pump, and the other end of the third switch valve is communicated with an oil inlet of the first reversing valve.
Preferably, the oil way switching valve comprises a first cartridge valve, a second shuttle valve and a second reversing valve;
an oil inlet of the first cartridge valve is communicated with an oil inlet of one end of the second shuttle valve, and an oil outlet of the first cartridge valve is communicated with an oil inlet of the first reversing valve;
the oil inlet of the second cartridge valve is communicated with the oil inlet of the other end of the second shuttle valve, and the oil outlet of the second cartridge valve is communicated with the oil inlet of the first reversing valve;
an oil outlet of the second shuttle valve is communicated with an oil inlet of the second reversing valve;
the oil return port of the second reversing valve is communicated with the oil tank, the first working oil port of the second reversing valve is communicated with the control oil port of the first cartridge valve, and the second working oil port of the second reversing valve is communicated with the control oil port of the second cartridge valve;
when the second reversing valve is positioned at the first station, the oil inlet of the second reversing valve is communicated with the first working oil port of the second reversing valve, and the oil return port of the second reversing valve is communicated with the second working oil port of the second reversing valve; when the second reversing valve is in the second station, the oil inlet of the second reversing valve is communicated with the second working oil port of the second reversing valve, and the oil return port of the second reversing valve is communicated with the first working oil port of the second reversing valve.
Preferably, the system further comprises a first pressure sensor, a second pressure sensor and a third pressure sensor;
the first pressure sensor is used for detecting the oil port pressure of the first energy accumulator, the second pressure sensor is used for detecting the oil port pressure of one end of the hydraulic motor, and the third pressure sensor is used for detecting the oil port pressure of the other end of the hydraulic motor;
the first pressure sensor, the second pressure sensor and the third pressure sensor are all in signal connection with a controller of the hydraulic motor.
The invention also provides engineering machinery, which comprises a vehicle body and a hydraulic control system arranged on the vehicle body, wherein the hydraulic control system is specifically a rotary driving mechanism starting braking energy-saving control system.
The invention provides a rotary driving mechanism braking starting energy-saving control system which mainly comprises an oil pump, a hydraulic motor, a first energy accumulator, an oil way switching valve, a first reversing valve and an oil return check valve. The hydraulic motor is mainly used for driving the rotary driving mechanism to perform rotary motion. The oil way switching valve is provided with two oil inlets, the oil inlet (the oil inlet and the oil outlet share one oil inlet) of the first energy accumulator is communicated with the first oil inlet of the oil way switching valve, the oil outlet of the oil pump is communicated with the second oil inlet of the oil way switching valve, and the oil outlet of the oil way switching valve is communicated with the oil inlet of the first reversing valve. The oil way switching valve is mainly used for switching oil inlet pressure sources, so that one of the first energy accumulator and the oil pump is communicated with an oil inlet of the first reversing valve, namely, the first energy accumulator is used for supplying oil to the first reversing valve or the oil pump is used for supplying oil to the first reversing valve. The first reversing valve is provided with at least four oil ports, namely an oil inlet, an oil return port, a first working oil port and a second working oil port, wherein the oil inlet is communicated with an oil outlet of the oil way switching valve, the oil return port is communicated with the oil tank, the first working oil port is communicated with one end oil port of the hydraulic motor, and the second working oil port is communicated with the other end oil port of the hydraulic motor. Meanwhile, the first reversing valve is provided with at least three stations and is respectively used for enabling the oil inlet of the first reversing valve to be cut off or to be communicated with one of the first working oil port and the second working oil port, and correspondingly enabling the oil outlet of the first reversing valve to be cut off or to be communicated with one of the first working oil port and the second working oil port. The oil return check valve is provided with two oil inlets and an oil outlet, wherein the first oil inlet is communicated with an oil port at one end of the hydraulic motor, the second oil inlet is communicated with an oil port at the other end of the hydraulic motor, and the oil outlet is communicated with an oil port of the first energy accumulator.
Therefore, when the rotary driving mechanism is started, the working state of the oil way switching valve is firstly switched to the communication of the first energy accumulator and the oil inlet of the first reversing valve, and at the moment, the pressure oil output by the first energy accumulator enters into the oil port at one end of the hydraulic motor after passing through the oil way switching valve and the first reversing valve, so that the hydraulic motor is driven to rotate positively or reversely, and the return oil of the hydraulic motor flows back to the oil tank through the first reversing valve. In the process, the oil pump does not supply oil to the hydraulic motor, only the oil stored in the first energy accumulator is used for supplying oil, and the pressure of the first energy accumulator does not exceed the set overflow pressure of the overflow valve, so that overflow loss cannot be generated, namely, the situation that the supply flow caused by oil supply of the oil pump is larger than the flow required by rotation of the hydraulic motor when the rotation driving mechanism is started, and the surplus flow must overflow from the overflow valve to generate energy loss can be avoided. When the pressure of the pressure oil output by the first energy accumulator is reduced to the set lowest working pressure, the working state of the oil way switching valve is switched to the communication of the oil pump and the oil inlet of the first reversing valve, at the moment, the oil pump runs, the output pressure oil enters into the oil port at one end of the hydraulic motor after passing through the oil way switching valve and the first reversing valve instead of the first energy accumulator, the hydraulic motor is continuously driven to rotate in the same direction, and the return oil of the hydraulic motor still flows back to the oil tank through the first reversing valve. When the rotary driving mechanism brakes, the station state of the first reversing valve changes simultaneously, at the moment, the first working oil port and the second working oil port of the first reversing valve are cut off, and the oil supply of the oil pump to the hydraulic motor is cut off immediately, but the rotary trend is still kept during braking due to the inertia action of the rotary driving mechanism, so that the hydraulic motor is in the working condition of the hydraulic pump, and high pressure is formed at the oil outlet of the hydraulic motor. Because the second working oil port of the first reversing valve is cut off, high-pressure oil on the oil outlet side of the hydraulic motor cannot flow back to the oil tank through the oil return port of the first reversing valve, but enters the first energy accumulator after passing through the oil return check valve, and the first energy accumulator is charged, so that energy recovery during braking is realized.
In summary, the energy-saving control system for starting and braking of the rotary driving mechanism provided by the invention can realize energy recovery in the starting and braking process of the rotary driving mechanism of the engineering machinery, avoid energy overflow loss and reduce system energy waste.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic overall structure of an embodiment of the present invention.
Fig. 2 is a schematic diagram of another specific structure of the oil return check valve.
Fig. 3 is a schematic diagram of another specific structure of the oil path switching valve.
Fig. 4 is a schematic view of another specific structure of the oil passage switching valve.
Wherein, in fig. 1-4:
the hydraulic oil pump comprises an oil pump-1, a hydraulic motor-2, a first energy accumulator-3, an oil way switching valve-4, a first reversing valve-5, an oil return check valve-6, a second energy accumulator-7, a first one-way valve-8, a second one-way valve-9, a first switching valve-10, a first pressure sensor-11, a second pressure sensor-12, a third pressure sensor-13, a fourth switching valve-14 and a fifth switching valve-15;
a second switching valve-41, a third switching valve-42, a first cartridge valve-43, a second cartridge valve-44, a second shuttle valve-45, a second reversing valve-46;
third check valve-61, fourth check valve-62.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic overall structure of an embodiment of the present invention.
In a specific embodiment provided by the invention, the energy-saving control system for starting and braking of the slewing drive mechanism mainly comprises an oil pump 1, a hydraulic motor 2, a first energy accumulator 3, an oil way switching valve 4, a first reversing valve 5 and an oil return check valve 6.
The hydraulic motor 2 is mainly used for driving the rotary driving mechanism to perform rotary motion.
The oil path switching valve 4 has two oil inlets, and the oil port (the inlet and the outlet share one oil port) of the first accumulator 3 is communicated with the first oil inlet (P1) of the oil path switching valve 4, the oil outlet of the oil pump 1 is communicated with the second oil inlet (P2) of the oil path switching valve 4, and the oil outlet (a) of the oil path switching valve 4 is communicated with the oil inlet of the first reversing valve 5. The oil path switching valve 4 is mainly used for switching oil inlet pressure sources, so that one of the first accumulator 3 and the oil pump 1 is communicated with an oil inlet of the first reversing valve 5, namely, the first accumulator 3 supplies oil to the first reversing valve 5 or the oil pump 1 supplies oil to the first reversing valve 5.
The first reversing valve 5 is provided with at least four oil ports, namely an oil inlet (P), an oil return port (T), a first working oil port (A) and a second working oil port (B), wherein the oil inlet is communicated with an oil outlet of the oil way switching valve 4, the oil return port is communicated with the oil tank, the first working oil port is communicated with one end oil port of the hydraulic motor 2, and the second working oil port is communicated with the other end oil port of the hydraulic motor 2. Meanwhile, the first reversing valve 5 is provided with at least three stations, and is respectively used for stopping an oil inlet of the first reversing valve or conducting one of the first working oil port and the second working oil port of the first reversing valve, and correspondingly stopping an oil outlet of the first reversing valve or conducting one of the first working oil port and the second working oil port of the first reversing valve.
The oil return check valve 6 is provided with two oil inlets and an oil outlet, a first oil inlet (A) of the oil return check valve is communicated with an oil port at one end of the hydraulic motor 2, a second oil inlet (B) of the oil return check valve is communicated with an oil port at the other end of the hydraulic motor 2, and an oil outlet (C) of the oil return check valve is communicated with an oil port of the first energy accumulator 3 and is mainly used for enabling oil ports at two ends of the hydraulic motor 2 to be in one-way conduction with the first energy accumulator 3 so that return oil during braking of the hydraulic motor 2 can enter the first energy accumulator 3, and pressure oil output by the first energy accumulator 3 cannot directly enter the hydraulic motor 2.
In this way, in the energy-saving control system for starting braking of the swing driving mechanism provided by the embodiment, when the swing driving mechanism is started, the working state of the oil way switching valve 4 is firstly switched to the communication between the first energy accumulator 3 and the oil inlet of the first reversing valve 5, and at this time, the pressure oil output by the first energy accumulator 3 enters into the oil port at one end of the hydraulic motor 2 after passing through the oil way switching valve 4 and the first reversing valve 5, so as to drive the hydraulic motor 2 to perform forward rotation or reverse rotation, and the return oil of the hydraulic motor 2 flows back to the oil tank through the first reversing valve 5. In this process, the oil pump 1 does not supply oil to the hydraulic motor 2, only the oil stored in the first accumulator 3 is used for supplying oil, and the pressure of the first accumulator 3 does not exceed the set relief pressure of the relief valve, so that no relief loss is generated, that is, the situation that the supply flow caused by the oil supply of the oil pump 1 is greater than the flow required for the rotation of the hydraulic motor 2 when the rotation driving mechanism is started, so that the surplus flow must overflow from the relief valve to generate energy loss can be avoided.
Then, when the pressure of the pressure oil output by the first accumulator 3 drops to the set lowest working pressure, the working state of the oil way switching valve 4 is switched to the communication between the oil pump 1 and the oil inlet of the first reversing valve 5, at this time, the oil pump 1 operates to replace the first accumulator 3, the output pressure oil enters into one of the oil ports of the hydraulic motor 2 after passing through the oil way switching valve 4 and the first reversing valve 5, the hydraulic motor 2 is continuously driven to rotate in the same direction, and the return oil of the hydraulic motor 2 still flows back to the oil tank through the first reversing valve 5.
When the rotary driving mechanism brakes, the station state of the first reversing valve 5 is changed at the same time, at the moment, the first working oil port and the second working oil port of the first reversing valve are cut off, and the oil supply of the oil pump 1 to the hydraulic motor 2 is cut off immediately, but the rotary trend is still kept during braking due to the inertia action of the rotary driving mechanism, so that the hydraulic motor 2 is in the working condition of the hydraulic pump, and high pressure is formed at the oil outlet of the hydraulic motor 2. Because the second working oil port of the first reversing valve 5 is cut off, high-pressure oil on the oil outlet side of the hydraulic motor 2 cannot flow back to the oil tank through the oil return port of the first reversing valve 5, but enters the first energy accumulator 3 through the oil return check valve 6, and charges the first energy accumulator 3, so that energy recovery during braking is realized.
In summary, the energy-saving control system for starting and braking of the rotary driving mechanism provided by the embodiment can realize energy recovery in the starting and braking process of the rotary driving mechanism of the engineering machinery, avoid energy overflow loss and reduce system energy waste.
In an alternative embodiment with respect to the first reversing valve 5, the first reversing valve 5 has three stations. When the hydraulic oil is in a first station (left station in the drawing), the oil inlet of the hydraulic oil is communicated with the second working oil port of the hydraulic oil, the oil return port of the hydraulic oil is communicated with the first working oil port of the hydraulic motor, and at the moment, pressure oil flows from the oil port at the other end to the oil port at one end of the hydraulic motor 2 to drive the hydraulic motor 2 to reversely rotate; when the hydraulic oil is in the second station (right station in the drawing), the oil inlet of the hydraulic oil is communicated with the first working oil port, the oil return port of the hydraulic oil is communicated with the second working oil port, and at the moment, the pressure oil flows from one oil port to the other oil port of the hydraulic motor 2 to drive the hydraulic motor 2 to rotate positively; when the hydraulic motor is in the third station (middle position in the drawing), the oil inlet, the oil return port, the first working oil port and the second working oil port are all cut off, and the hydraulic motor 2 is braked at the moment.
Considering that when the swing drive mechanism is braking, the first reversing valve 5 immediately cuts off the oil supply of the oil pump 1 to the hydraulic motor 2, and the hydraulic motor 2 is still in the running process due to the inertia of the swing drive mechanism, so that the oil inlet side flow of the hydraulic motor 2 is insufficient, and the hydraulic motor 2 is sucked up, so that the elements are damaged. For this, a second accumulator 7 is added in the present embodiment. The oil ports of the second energy accumulator 7 are simultaneously communicated with the oil ports at the two ends of the hydraulic motor 2, so that when the rotary driving mechanism brakes, one oil port at one end of the hydraulic motor 2 is supplemented with oil to supplement the oil inlet flow of the hydraulic motor 2, and the phenomenon of suction is prevented. Meanwhile, in order to avoid the second accumulator 7 from outputting pressure oil when not needed, a first check valve 8 and a second check valve 9 are added in the embodiment. The first one-way valve 8 is connected between the oil port of the second accumulator 7 and the oil port of one end of the hydraulic motor 2, and the non-return end of the first one-way valve is communicated with the oil port of one end of the hydraulic motor 2. The second one-way valve 9 is connected between the oil port of the second accumulator 7 and the oil port of the other end of the hydraulic motor 2, and the non-return end thereof is communicated with the oil port of the other end of the hydraulic motor 2. For ease of connection, the free ends of the first check valve 8 and the second check valve 9 may be connected to each other to form a common port, and the oil port of the second accumulator 7 may be in communication with the common port. In this way, the hydraulic oil passing through the hydraulic motor 2 (whether forward or reverse) can be prevented from flowing back into the second accumulator 7.
Further, in order to facilitate the control of the oil replenishing operation of the second accumulator 7, a first switch valve 10 is added in this embodiment. Specifically, one end of the first switch valve 10 is communicated with the oil port of the second accumulator 7, and the other end of the first switch valve 10 is communicated with the common oil port of the first check valve 8 and the second check valve 9. When the first switch valve 10 is in the closed state, the oil path is disconnected, and the second accumulator 7 cannot output pressure oil to the common oil ports of the first check valve 8 and the second check valve 9; when the first switch valve 10 is in an open state, the oil passage is conducted, and the second accumulator 7 outputs the pressure oil to the common oil port of the first check valve 8 and the second check valve 9.
In an alternative embodiment with respect to the return check valve 6, as shown in fig. 1, the return check valve 6 is embodied as a split structure mainly comprising a third check valve 61 and a fourth check valve 62. The third one-way valve 61 is connected between an oil port at one end of the hydraulic motor 2 and an oil port of the first accumulator 3, and a non-return end of the third one-way valve is communicated with the oil port at one end of the hydraulic motor 2. The fourth check valve 62 is connected between the other end port of the hydraulic motor 2 and the port of the first accumulator 3, and its check end communicates with the other end port of the hydraulic motor 2. For ease of connection, the free ends of the third check valve 61 and the fourth check valve 62 may be connected to each other to form a common port, and the oil port of the first accumulator 3 may be communicated with the common port. When the slewing drive mechanism brakes, high-pressure oil can flow back to the first energy accumulator 3 through the third check valve 61 or the fourth check valve 62, so that energy recovery is realized.
As shown in fig. 2, fig. 2 is a schematic diagram showing another specific structure of the oil return check valve 6.
In an alternative embodiment with respect to the return check valve 6, the return check valve 6 is embodied as a unitary structure, in particular as a first shuttle valve. The first oil inlet (A) of the first shuttle valve is communicated with an oil port at one end of the hydraulic motor 2, the second oil inlet (B) of the first shuttle valve is communicated with an oil port at the other end of the hydraulic motor 2, and the oil outlet (C) of the first shuttle valve is communicated with an oil port of the first energy accumulator 3. When the rotary driving mechanism brakes, no matter the hydraulic motor 2 rotates positively or reversely, high-pressure return oil can always enter the first energy accumulator 3 through the first shuttle valve, and energy recovery is achieved.
In an alternative embodiment with respect to the oil passage switching valve 4, as shown in fig. 1, the oil passage switching valve 4 is embodied as a two-position three-way directional valve. When the two-position three-way reversing valve is in a first station, a first oil inlet of the two-position three-way reversing valve is communicated with an oil outlet of the two-position three-way reversing valve, a second oil inlet of the two-position three-way reversing valve is cut off, and at the moment, pressure oil output by the first energy accumulator 3 enters an oil inlet of the first reversing valve 5 after passing through a P1-A oil way; when the two-position three-way reversing valve is in the second station, the first oil inlet is cut off, the second oil inlet is communicated with the oil outlet, and at the moment, the pressure oil output by the oil pump 1 enters the oil inlet of the first reversing valve 5 after passing through the P2-A oil way.
As shown in fig. 3, fig. 3 is a schematic diagram showing another specific structure of the oil passage switching valve 4.
In another alternative embodiment regarding the oil passage switching valve 4, the oil passage switching valve 4 specifically includes a second switching valve 41 and a third switching valve 42. One end of the second switch valve 41 is communicated with an oil port of the first energy accumulator 3, and the other end of the second switch valve 41 is communicated with an oil inlet of the first reversing valve 5. One end of the third switch valve 42 is communicated with an oil outlet of the oil pump 1, and the other end of the third switch valve 42 is communicated with an oil inlet of the first reversing valve 5. So arranged, when the second switch valve 41 is opened and the third switch valve 42 is closed, the pressure oil output by the first accumulator 3 enters the oil inlet of the first reversing valve 5 after passing through the P1-A oil path; when the third switching valve 42 is opened and the second switching valve 41 is closed, the pressure oil output from the oil pump 1 passes through the P2-a oil passage and then enters the oil inlet of the first reversing valve 5.
As shown in fig. 4, fig. 4 is a schematic view showing still another specific structure of the oil passage switching valve 4.
In yet another alternative embodiment regarding the oil passage switching valve 4, the oil passage switching valve 4 specifically includes a first cartridge valve 43, a second cartridge valve 44, a second shuttle valve 45, and a second reversing valve 46.
The oil inlet (a) of the first cartridge valve 43 is communicated with the oil inlet (a) of one end of the second shuttle valve 45, and the oil outlet (B) of the first cartridge valve 43 is communicated with the oil inlet of the first reversing valve 5. The oil inlet (A) of the second cartridge valve 44 is communicated with the oil inlet (B) of the other end of the second shuttle valve 45, and the oil outlet (B) of the second cartridge valve 44 is communicated with the oil inlet of the first reversing valve 5. Meanwhile, the oil outlet (C) of the second shuttle valve 45 is communicated with the oil inlet (P) of the second reversing valve 46, the oil return port (T) of the second reversing valve 46 is communicated with the oil tank, the first working port (a) of the second reversing valve 46 is communicated with the control port (C) of the first cartridge valve 43, and the second working port (B) of the second reversing valve 46 is communicated with the control port (C) of the second cartridge valve 44.
When the second reversing valve 46 is at the first station, the oil inlet of the second reversing valve is communicated with the first working oil port of the second reversing valve, and the oil return port of the second reversing valve is communicated with the second working oil port of the second reversing valve; when the second reversing valve 46 is in the second station, the oil inlet is communicated with the second working oil port, and the oil return port is communicated with the first working oil port.
When the second reversing valve 46 is at the first station (left station in the drawing), the pressure oil of P1 and P2 passes through the second shuttle valve 45 and then enters the control oil port of the first cartridge valve 43 through the P-A oil path of the second reversing valve 46, so that the first cartridge valve 43 is closed, the control oil port of the second cartridge valve 44 is pressureless, the second cartridge valve 44 is opened, and the pressure oil output by the oil pump 1 passes through the second cartridge valve 44 and then enters the oil inlet of the first reversing valve 5; when the second reversing valve 46 is at the second station (right station in the drawing), after the pressure oil of P1 and P2 passes through the second shuttle valve 45, the pressure oil passes through the P-B oil path of the second reversing valve 46 and enters the control oil port of the second cartridge valve 44, so that the second cartridge valve 44 is closed, the control oil port of the first cartridge valve 43 is pressureless, the first cartridge valve 43 is opened, and the pressure oil output by the first accumulator 3 passes through the first cartridge valve 43 and enters the oil inlet of the first reversing valve 5.
In addition, certain requirements are imposed on the working conditions of the hydraulic motor 2 in view of the starting and braking of the swing drive mechanism. For this, the first pressure sensor 11, the second pressure sensor 12, and the third pressure sensor 13 are additionally provided in the present embodiment. The first pressure sensor 11 is used for detecting the oil port pressure of the first energy accumulator 3, the second pressure sensor 12 is used for detecting the oil port pressure of one end of the hydraulic motor 2, and the third pressure sensor 13 is used for detecting the oil port pressure of the other end of the hydraulic motor 2. And, the first pressure sensor 11, the second pressure sensor 12 and the third pressure sensor 13 are all connected with a controller of the hydraulic motor 2 in a signal manner, and the controller is mainly used for controlling working conditions of the hydraulic motor 2, such as parameters of the displacement of the hydraulic motor 2. So set up, can detect the output pressure of first energy storage ware 3 in real time through first pressure sensor 11, can detect hydraulic motor 2's business turn over hydraulic fluid port pressure differential in real time through second pressure sensor 12 and third pressure sensor 13, and business turn over hydraulic fluid port pressure differential influences hydraulic motor 2's output torque. In order to ensure stable and efficient recovery of braking energy and realize the motion characteristics of system rotation acceleration, uniform speed, braking and the like, when the first energy accumulator 3 is used for supplying oil, the controller simultaneously controls parameters such as the displacement of the hydraulic motor 2 and the like according to the detection data of the first pressure sensor 11, so that the displacement of the hydraulic motor is changed along with the change of the output pressure of the first energy accumulator 3, and a certain output torque is maintained; when the rotary driving mechanism brakes, the controller simultaneously controls parameters such as the displacement of the hydraulic motor 2 and the like according to the detection data of the first pressure sensor 11 and the second pressure sensor 12, so that certain output torque is maintained, and the braking torque requirement is met.
In addition, a fourth switching valve 14 and a fifth switching valve 15 are further added in the present embodiment. The fourth switching valve 14 is connected between the first working oil port of the first reversing valve 5 and an oil port at one end of the hydraulic motor 2, and the fifth switching valve 15 is connected between the second working oil port of the first reversing valve 5 and an oil port at the other end of the hydraulic motor 2. In this way, when the swing drive mechanism brakes, not only the first directional valve 5 can be in the neutral position, but also the fourth switching valve 14 or the fifth switching valve 15 can be correspondingly in the closed state, so that the oil return is prevented from leaking through the first directional valve 5.
The present embodiment also provides an engineering machine, which mainly includes a vehicle body and a hydraulic control system disposed on the vehicle body, where the hydraulic control system adopts all the technical schemes of the embodiment of the above-mentioned swing driving mechanism for starting the braking energy-saving control system, so that the engineering machine provided in this embodiment also has all the technical effects brought by the technical schemes of the above-mentioned embodiment, and is not repeated here.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The energy-saving control system for starting and braking of the slewing drive mechanism comprises an oil pump (1) and a hydraulic motor (2), and is characterized by further comprising a first energy accumulator (3), an oil way switching valve (4), a first reversing valve (5) and an oil return check valve (6);
an oil port of the first energy accumulator (3) is communicated with a first oil inlet of the oil way switching valve (4), an oil outlet of the oil pump (1) is communicated with a second oil inlet of the oil way switching valve (4), and an oil outlet of the oil way switching valve (4) is communicated with an oil inlet of the first reversing valve (5);
the oil return port of the first reversing valve (5) is communicated with an oil tank, the first working oil port of the first reversing valve (5) is communicated with an oil port at one end of the hydraulic motor (2), and the second working oil port of the first reversing valve (5) is communicated with an oil port at the other end of the hydraulic motor (2);
the first oil inlet of the oil return check valve (6) is communicated with an oil port at one end of the hydraulic motor (2), the second oil inlet of the oil return check valve (6) is communicated with an oil port at the other end of the hydraulic motor (2), and the oil outlet of the oil return check valve (6) is communicated with an oil port of the first energy accumulator (3);
the oil way switching valve (4) is used for enabling one of the first energy accumulator (3) and the oil pump (1) to be communicated with an oil inlet of the first reversing valve (5);
the first reversing valve (5) is used for stopping an oil inlet of the first reversing valve or conducting one of the first working oil port and the second working oil port of the first reversing valve, and stopping an oil outlet of the first reversing valve or conducting one of the first working oil port and the second working oil port of the first reversing valve;
the oil return check valve (6) is used for conducting oil ports at two ends of the hydraulic motor (2) to the first energy accumulator (3) in a one-way mode.
2. The swing drive mechanism brake-on energy-saving control system according to claim 1, further comprising a second accumulator (7), a first check valve (8), a second check valve (9);
the oil ports of the second energy accumulator (7) are simultaneously communicated with the oil ports at two ends of the hydraulic motor (2) and are used for supplementing oil to the oil port at one end of the hydraulic motor (2) when the rotary driving mechanism brakes;
the first one-way valve (8) is connected between an oil port of the second energy accumulator (7) and an oil port at one end of the hydraulic motor (2), and the non-return end of the first one-way valve is communicated with the oil port at one end of the hydraulic motor (2); the second one-way valve (9) is connected between the oil port of the second energy accumulator (7) and the oil port of the other end of the hydraulic motor (2), and the non-return end of the second one-way valve is communicated with the oil port of the other end of the hydraulic motor (2).
3. The swing drive brake-on energy saving control system according to claim 2, further comprising a first on-off valve (10);
one end of the first switch valve (10) is communicated with an oil port of the second energy accumulator (7), and the other end of the first switch valve (10) is communicated with a public oil port of the first one-way valve (8) and the public oil port of the second one-way valve (9).
4. The swing drive brake-on energy saving control system according to claim 1, wherein the return oil check valve (6) includes a third check valve (61) and a fourth check valve (62);
the third one-way valve (61) is connected between an oil port at one end of the hydraulic motor (2) and an oil port of the first energy accumulator (3), and the non-return end of the third one-way valve is communicated with an oil port at one end of the hydraulic motor (2);
the fourth one-way valve (62) is connected between the oil port at the other end of the hydraulic motor (2) and the oil port of the first energy accumulator (3), and the non-return end of the fourth one-way valve is communicated with the oil port at the other end of the hydraulic motor (2).
5. The swing drive mechanism brake-on energy-saving control system according to claim 1, wherein the return oil check valve (6) is a first shuttle valve;
the first oil inlet of the first shuttle valve is communicated with an oil port at one end of the hydraulic motor (2), the second oil inlet of the first shuttle valve is communicated with an oil port at the other end of the hydraulic motor (2), and the oil outlet of the first shuttle valve is communicated with an oil port of the first energy accumulator (3).
6. The swing driving mechanism braking energy-saving control system according to claim 1, wherein the oil way switching valve (4) is a two-position three-way reversing valve;
when the two-position three-way reversing valve is in the first station, the first oil inlet of the two-position three-way reversing valve is communicated with the oil outlet of the two-position three-way reversing valve, and the second oil inlet of the two-position three-way reversing valve is cut off; when the two-position three-way reversing valve is in the second station, the first oil inlet of the two-position three-way reversing valve is cut off, and the second oil inlet of the two-position three-way reversing valve is communicated with the oil outlet of the two-position three-way reversing valve.
7. The swing drive mechanism brake-on energy saving control system according to claim 1, wherein the oil passage switching valve (4) includes a second switching valve (41) and a third switching valve (42);
one end of the second switch valve (41) is communicated with an oil port of the first energy accumulator (3), and the other end of the second switch valve (41) is communicated with an oil inlet of the first reversing valve (5);
one end of the third switch valve (42) is communicated with an oil outlet of the oil pump (1), and the other end of the third switch valve (42) is communicated with an oil inlet of the first reversing valve (5).
8. The swing drive mechanism brake-on energy-saving control system according to claim 1, wherein the oil path switching valve (4) includes a first cartridge valve (43), a second cartridge valve (44), a second shuttle valve (45), and a second reversing valve (46);
an oil inlet of the first cartridge valve (43) is communicated with an oil inlet at one end of the second shuttle valve (45), and an oil outlet of the first cartridge valve (43) is communicated with an oil inlet of the first reversing valve (5);
an oil inlet of the second cartridge valve (44) is communicated with an oil inlet at the other end of the second shuttle valve (45), and an oil outlet of the second cartridge valve (44) is communicated with an oil inlet of the first reversing valve (5);
an oil outlet of the second shuttle valve (45) is communicated with an oil inlet of the second reversing valve (46);
the oil return port of the second reversing valve (46) is communicated with an oil tank, the first working oil port of the second reversing valve (46) is communicated with the control oil port of the first cartridge valve (43), and the second working oil port of the second reversing valve (46) is communicated with the control oil port of the second cartridge valve (44);
when the second reversing valve (46) is positioned at the first station, an oil inlet of the second reversing valve is communicated with a first working oil port of the second reversing valve, and an oil return port of the second reversing valve is communicated with a second working oil port of the second reversing valve; when the second reversing valve (46) is in the second station, the oil inlet of the second reversing valve is communicated with the second working oil port of the second reversing valve, and the oil return port of the second reversing valve is communicated with the first working oil port of the second reversing valve.
9. The swing drive mechanism brake on energy saving control system according to claim 1, further comprising a first pressure sensor (11), a second pressure sensor (12) and a third pressure sensor (13);
the first pressure sensor (11) is used for detecting the oil port pressure of the first energy accumulator (3), the second pressure sensor (12) is used for detecting the oil port pressure at one end of the hydraulic motor (2), and the third pressure sensor (13) is used for detecting the oil port pressure at the other end of the hydraulic motor (2);
the first pressure sensor (11), the second pressure sensor (12) and the third pressure sensor (13) are all in signal connection with a controller of the hydraulic motor (2).
10. An engineering machine comprising a vehicle body and a hydraulic control system arranged on the vehicle body, wherein the hydraulic control system is specifically a rotary driving mechanism start braking energy-saving control system as claimed in any one of claims 1 to 9.
CN202311345791.7A 2023-10-18 2023-10-18 Engineering machinery and energy-saving control system for starting braking of slewing drive mechanism of engineering machinery Pending CN117267185A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311345791.7A CN117267185A (en) 2023-10-18 2023-10-18 Engineering machinery and energy-saving control system for starting braking of slewing drive mechanism of engineering machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311345791.7A CN117267185A (en) 2023-10-18 2023-10-18 Engineering machinery and energy-saving control system for starting braking of slewing drive mechanism of engineering machinery

Publications (1)

Publication Number Publication Date
CN117267185A true CN117267185A (en) 2023-12-22

Family

ID=89206182

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311345791.7A Pending CN117267185A (en) 2023-10-18 2023-10-18 Engineering machinery and energy-saving control system for starting braking of slewing drive mechanism of engineering machinery

Country Status (1)

Country Link
CN (1) CN117267185A (en)

Similar Documents

Publication Publication Date Title
WO2015117338A1 (en) Single-hydraulic motor double-loop control system
CN103267034A (en) Load sensitive hydraulic system with compensation valve energy recovery function
CN111649023B (en) Buffering oil supplementing system and method for electro-hydraulic double-control motor driving rotation system
CN105485066A (en) Electro-hydraulic hybrid power drive system of tunneling machine and control method
CN101858091A (en) Quantitative pump hydraulic control system of working mechanism of underground scraper
JP5028729B2 (en) Control method of boom cylinder circuit of hydraulic excavator
CN110937541B (en) Winch hydraulic system using O-shaped median function reversing valve
CN219672958U (en) Hydraulic traveling driving system applied to digging and anchoring machine and digging and anchoring machine
CN110439871B (en) Front wheel auxiliary driving system, control method and engineering vehicle
CN117267185A (en) Engineering machinery and energy-saving control system for starting braking of slewing drive mechanism of engineering machinery
CN108953309B (en) Energy recovery and recycling hydraulic system
CN110541868A (en) engineering machinery slewing braking energy recovery system utilizing flywheel to store energy
CN115370628A (en) Rotary hydraulic system, rotary device and working machine
CN109642665A (en) Fluid pressure circuit
CN108915021B (en) Multi-mode rotary electrohydraulic control system for hydraulic excavator
CN2777259Y (en) Divided-flow hydraulic control system for main valve of rotating digging drilling machine
CN108825564B (en) Stable energy recovery system and excavator with same
CN103085657B (en) The open type hydraulic system that can brake and braking method, walking machine
JP3978292B2 (en) Travel drive device
CN214304594U (en) High-low speed hydraulic walking system of drive axle
CN117167353B (en) Double-speed closed hydraulic traveling system and method for skid steer loader
CN217898336U (en) Hydraulic valve group for engineering machinery rotation system
CN215672927U (en) Rotary hydraulic system and working machine
CN115584772B (en) Energy-saving hydraulic system of electric loader and electric loader
CN213705407U (en) Brake valve bank for hydrostatic transmission system of railway engineering machinery vehicle

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination