Walking braking energy recovery and control system for heavy transportation equipment

Abstract

The invention provides a heavy transportation equipment walking braking energy recovery and control system which is formed by adding an energy recovery and release control unit on the basis of an original closed type hydraulic driving system, and the original hydraulic system does not need to be transformed at all. And the control unit can realize switching between a common mode and an energy recovery and release mode by controlling the electromagnetic control valve group.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of heavy transport equipment walking brake energy recovery and control system, more particularly to a kind of closed hydraulic drive heavy transport equipment walking brake energy recovery and control system. BACKGROUND

[0002] Heavy transport equipment is widely used in high-speed railway bridge erection construction, mainly responsible for the prefabricated box girder from beam field transport to box girder erection ground, belongs to a kind of off-road heavy transport equipment.

[0003] Heavy transport equipment generally mainly includes chassis, power system, steering system, suspension system, walking driving system and control system etc., and its walking driving system often adopts pump-controlled motor closed hydraulic drive mode. Figure 1 As shown in the drawing, pump-controlled motor closed hydraulic drive is mainly composed of closed pump 101, walking motor 104, oil supplement circuit 102, safety valve 103 and flushing circuit 105.

[0004] Heavy transport equipment inertia is big, when it works in downhill or brake and other overrun conditions, pump-controlled motor closed loop working condition is reversed, its loop oil circulation balance is broken, leading to the pressure of driving pipeline cavity rising to safety valve 103 opening, system high pressure overflow. At this time, the potential energy or inertia of equipment can be converted into heat energy dissipation, causing energy loss, and the lost energy will cause the heating of loop oil, causing the driving efficiency of the system to be reduced, thereby further increasing the loss of the system. The oil of closed loop can be replaced through its oil supplement circuit 102 and flushing circuit 105, which can improve the heat dissipation condition of closed system to a certain extent, but system high pressure overflow will seriously affect the service life of hydraulic components and pipeline.

[0005] Therefore, when heavy transport equipment brakes, if the closed system pipeline pressure can be adjusted and the braking energy can be recycled and reused to a certain extent, not only can the driving efficiency of heavy transport equipment be improved, the engine oil consumption can be reduced, but also the service life of heavy transport equipment components can be effectively improved. SUMMARY

[0006] In order to realize adjusting the closed system pipeline pressure and recycling and reusing the braking energy to a certain extent, improve the driving efficiency of heavy transport equipment, reduce engine oil consumption, and more effectively improve the service life of heavy transport equipment components.

[0007] The present application provides a kind of heavy transport equipment walking brake energy recovery and control system, including: control unit 4, energy storage unit 3, energy conversion unit 2, solenoid valve control assembly 1, cartridge valve assembly 5, pressure sensor assembly;

[0008] The electromagnetic valve control assembly 1 comprises: an electromagnetic control valve 6, an electromagnetic control valve 7, an electromagnetic control valve 9, an electromagnetic control valve 10 and a shuttle valve 8.

[0009] The plug-in valve assembly 5 comprises: a plug-in valve 19, a plug-in valve 20, a plug-in valve 21, a plug-in valve 22.

[0010] The energy conversion unit 2 comprises: a fixed displacement motor 12, a variable displacement pump 15, a one-way valve 11, a one-way valve 14, an electromagnetic control valve 13, an overflow valve 25; the pressure sensor assembly comprises: a pressure sensor 23, a pressure sensor 24, a pressure sensor 17.

[0011] The energy storage unit 3 comprises: an accumulator 15, an electro-hydraulic proportional flow valve 18, an overflow valve 16; the inlet A of the plug-in valve 19 and the inlet A of the plug-in valve 20 are connected with the pipeline A respectively, the inlet A of the plug-in valve 21 and the inlet A of the plug-in valve 22 are connected with the pipeline B respectively.

[0012] The outlet B of the plug-in valve 19, the outlet B of the plug-in valve 22, the outlet B of the electro-hydraulic proportional flow valve 18 and the inlet A of the fixed displacement motor 12 are connected with each other; the outlet B of the plug-in valve 20, the outlet B of the plug-in valve 21 and the outlet of the one-way valve 11 are connected with each other, and the inlet of the one-way valve 11 is connected with the outlet B of the fixed displacement motor 12.

[0013] The control port X of the plug-in valve 19 is connected with the outlet A of the electromagnetic control valve 7, the control port X of the plug-in valve 20 is connected with the outlet A of the electromagnetic control valve 6, the control port X of the plug-in valve 21 is connected with the outlet A of the electromagnetic control valve 10, and the control port X of the plug-in valve 22 is connected with the outlet A of the electromagnetic control valve 9; the outlet T of the electromagnetic control valve 6, the outlet T of the electromagnetic control valve 7, the outlet T of the electromagnetic control valve 9 and the outlet T of the electromagnetic control valve 10 are connected with each other and connected with the oil tank.

[0014] The inlet P of the electromagnetic control valve 6, the inlet P of the electromagnetic control valve 7, the inlet P of the electromagnetic control valve 9 and the inlet P of the electromagnetic control valve 10 are connected with each other and connected with the outlet of the shuttle valve 8.

[0015] The two inlets of the shuttle valve 8 are connected with the pressure oil driving pipeline A and the pressure oil driving pipeline B respectively.

[0016] The fixed displacement motor 12 drives the variable displacement pump 15 to rotate, the inlet of the variable displacement pump 15 is connected with the oil tank, and the outlet P is connected with the inlet P of the electromagnetic valve 13, the inlet of the accumulator, the inlet of the overflow valve 16 and the inlet A of the electro-hydraulic proportional flow valve 18 through the one-way valve 14.

[0017] The control unit 4 collects the accumulator pressure through the pressure sensor 17, collects the pipeline A pressure through the pressure sensor 23 and collects the pipeline B pressure through the pressure sensor 24 respectively.

[0018] The control unit 4 controls the electromagnetic control valve 6, the electromagnetic control valve 7, the electromagnetic control valve 9, the electromagnetic control valve 10, the electromagnetic control valve 13, the variable pump 15 and the electro-hydraulic proportional flow valve 18 respectively.

[0019] More specifically, the walking driving normal mode is that the control unit 4 issues a command to make the electromagnetic control valve 6, the electromagnetic control valve 7, the electromagnetic control valve 9 and the electromagnetic control valve 10 all not be electrified and work in the normal position; the high-pressure oil selected from the pipeline A or the pipeline B through the shuttle valve 8 enters the P port of the electromagnetic control valve 6, the electromagnetic control valve 7, the electromagnetic control valve 9 and the electromagnetic control valve 10 respectively and then enters the control port X of the cartridge valve 19, the cartridge valve 20, the cartridge valve 21 and the cartridge valve 22 from the outlet A thereof respectively; under the action of the high-pressure oil, the inlet and outlet oil ports A and B of the cartridge valve 19, the cartridge valve 20, the cartridge valve 21 and the cartridge valve 22 are all closed; the closed system is driven by the closed pump 101 as a power source to drive the walking motor 104 to rotate, so that the walking driving of the heavy transport equipment is realized.

[0020] More specifically, the energy recovery mode is that when the heavy transport equipment is in the downhill or braking working condition, the control unit 4 collects the operation signal and the accumulator 15 pressure signal to determine whether to enter the energy recovery mode; when the conditions are met, the control unit 4 collects the pipeline A and the pipeline B pressure to determine which of the pipeline A and the pipeline B is the high-pressure pipeline.

[0021] More specifically, if the pipeline A is the high-pressure pipeline: the control unit 4 issues a control signal to electrify the electromagnetic control valve 7 and the electromagnetic control valve 10 to make the outlet A thereof all be connected with the T port respectively; the oil in the control chamber of the cartridge valve 19 flows back to the oil tank through the control port X and the A port of the electromagnetic control valve 7; under the action of the pipeline A pressure, the cartridge valve 19 valve port is opened, the pipeline A oil flows into the B port of the cartridge valve 19 and then flows into the A port of the fixed displacement motor 12; the oil back of the fixed displacement motor 12 flows to the B port of the cartridge valve 21 through the outlet B and the one-way valve 11, the oil in the control chamber of the cartridge valve 21 flows back to the oil tank through the control port X and the A port of the electromagnetic control valve 10; under the action of the oil pressure of the B port, the cartridge valve 21 valve port is opened, the back oil flows into the A port of the cartridge valve 21 from the B port and then flows into the pipeline B; under the action of the pressure difference between the pipeline A and the pipeline B, the fixed displacement motor 12 drives the variable pump 15 to rotate, the variable pump 15 starts to suck oil from the oil tank under the given displacement signal of the control unit 4 and then pumps the oil into the accumulator 15 through the one-way valve 14; part of the potential energy or the inertia energy of the heavy transport equipment is converted into the pressure energy of the oil by the variable pump 15 and stored in the accumulator 15;

[0022] If the pipeline B is high pressure pipeline: control unit 4 sends control signal to make electromagnetic control valve 9, electromagnetic control valve 6 electrified, make its outlet A connect with T port respectively; The oil in the control chamber of plug-in valve 22 flows back to the oil tank through the control port X of plug-in valve 22 and the A port of electromagnetic control valve 9, under the action of the pressure of pipeline B, the valve port of plug-in valve 22 opens, the oil in pipeline B flows into the A port of plug-in valve 22 through the B port, and finally flows into the A port of variable displacement motor 12; The oil back of variable displacement motor 12 flows to the B port of plug-in valve 20 through the outlet B of variable displacement motor 12 and the one-way valve 11, the oil in the control chamber of plug-in valve 20 flows back to the oil tank through the control port X of plug-in valve 20 and the A port of electromagnetic control valve 6, under the action of the oil pressure of B port, the valve port of plug-in valve 20 opens, the oil back flows into A through the B port of plug-in valve 20, and finally flows into pipeline B; Under the action of the pressure difference between pipeline A and pipeline B, variable displacement motor 12 drives variable displacement pump 15 to rotate, under the given displacement signal of control unit 4, variable displacement pump 15 starts to suck oil from the oil tank, and pumps the oil into accumulator 15 through one-way valve 14; Part of potential energy or inertia of heavy transport equipment is converted into pressure energy of oil and stored in accumulator 15 through variable displacement pump 15.

[0023] More specifically, in the energy recovery process, when the flow of pipeline A or pipeline B is too large, high pressure will be generated at variable displacement motor 12, in order to avoid damage to variable displacement motor, energy conversion unit 2 is equipped with overflow valve 25, when the pipeline pressure is too high, the oil in the pipeline can overflow through overflow valve 25, thereby protecting the energy conversion unit.

[0024] More specifically, in the energy recovery process, control unit 4 can control the pressure of inlet A of variable displacement motor 12 by adjusting the displacement of variable displacement pump 15, thereby realizing the pressure regulation of pipeline A or pipeline B, to a certain extent, playing the role of regulating the braking force of heavy transport equipment, which can be used as an auxiliary braking mode of heavy transport equipment.

[0025] More specifically, in the energy recovery process, in order to limit the outlet pressure of variable displacement pump 14 and prevent high pressure from damaging energy storage unit 3, energy storage unit 3 is equipped with overflow valve 16, when the pressure of accumulator 15 reaches a certain value, overflow valve 16 opens to overflow, thereby protecting the energy storage unit.

[0026] More specifically, the energy release mode is as follows: when the heavy transport equipment starts, control unit 4 collects the pressure signal of accumulator 15 and the operation information of driver, and determines whether the pressure oil of accumulator 15 drives pipeline A or pipeline B according to the operation information;

[0027] If the conditions are met and it is determined that the accumulator pressure oil drives the pipeline A, the control unit 4 sends a control signal to make the electromagnetic control valve 6 and the electro-hydraulic proportional flow valve 18 electrified; the A and B ports of the electro-hydraulic proportional flow control valve 18 are open, the pressure oil of the accumulator 15 passes through the electro-hydraulic proportional flow valve 18 and flows into the B port of the plug valve 20; the outlet A of the electromagnetic control valve 6 is connected with the T port, and the control cavity oil of the plug valve 20 flows back to the tank through the A port of the electromagnetic control valve 6 from the control port X; under the pressure of the oil in the B port, the plug valve 20 is opened, the oil flows from the B port to the A port and then flows into the pipeline A, and finally the pressure oil in the accumulator 15 flows into the pipeline A to drive the walking motor 104 to rotate; the excess oil in the closed circulation system is discharged through the closed system flushing circuit 105, and the closed system is driven in one direction by the accumulator 15 as an auxiliary power source; the control unit 4 can adjust the output flow of the electro-hydraulic proportional flow valve 18 by collecting the amplitude of the operation signal and the pressure of the accumulator 15, so as to realize the speed control of the walking of the heavy transport equipment.

[0028] If the conditions are met and it is determined that the accumulator pressure oil drives the pipeline B, the control unit 4 sends a control signal to make the electromagnetic control valve 10 and the electro-hydraulic proportional flow valve 18 electrified; the A and B ports of the electro-hydraulic proportional flow control valve 18 are open, the pressure oil of the accumulator 15 passes through the electro-hydraulic proportional flow valve 18 and flows into the B port of the plug valve 21; the outlet A of the electromagnetic control valve 10 is connected with the T port, and the control cavity oil of the plug valve 21 flows back to the tank through the A port of the electromagnetic control valve 10 from the control port X; under the pressure of the oil in the B port, the plug valve 21 is opened, the oil flows from the B port to the A port and then flows into the pipeline B, and finally the pressure oil in the accumulator 15 flows into the pipeline B to drive the walking motor 104 to rotate; the excess oil in the closed circulation system is discharged through the closed system flushing circuit 105, and the closed system is driven in the opposite direction by the accumulator 15 as an auxiliary power source; the control unit 4 can adjust the output flow of the electro-hydraulic proportional flow valve 18 by collecting the amplitude of the operation signal and the pressure of the accumulator 15, so as to realize the speed control of the walking of the heavy transport equipment.

[0029] More specifically, when the accumulator 15 is used as an auxiliary driving source, the control unit 4 collects the pressure of the accumulator 15, and when the pressure drops to a certain extent, the closed system is switched to the ordinary mode of walking driving.

[0030] More specifically, the accumulator 15 as an auxiliary power source can provide hydraulic power for the equipment steering system 211 and the suspension system 210, etc.

[0031] The suspension system 210 includes a suspension oil cylinder 201, a balance valve 202, a shuttle valve 203, an electro-proportional directional valve 204, and a pressure compensation valve 205.

[0032] The steering system 211 comprises a steering cylinder 206, a shuttle valve 207, an electric proportional directional valve 208 and a pressure compensation valve 209.

[0033] Compared with the prior art, the technical effects that can be achieved by the technical scheme conceived by the application are:

[0034] 1. The application is formed by adding an energy recovery and release control unit on the basis of the original closed hydraulic driving system, without any modification to the original hydraulic system, and the control unit can realize the switching of the ordinary mode and the energy recovery and release mode by controlling the electromagnetic control valve group.

[0035] 2. When energy recovery is performed, the control unit can control the energy conversion unit to always access the pipe with higher pressure between pipe A and pipe B.

[0036] 3. When energy recovery is performed, the control system can ensure that the constant flow motor maintains the same rotation direction, thereby ensuring the reliable operation of the hydraulic pump.

[0037] 4. When energy recovery is performed, the pressure oil in the closed system flows out from pipe A or pipe B, flows into pipe B or pipe A after the constant flow motor, and the oil in the closed system always maintains a circulating balance, thereby avoiding the vacuum phenomenon of pipe A or pipe B caused by insufficient oil supplement of the closed system.

[0038] 5. When energy recovery is performed, the control system can control the pressure at the inlet of the constant flow motor by adjusting the displacement of the variable pump, realize the control of the braking force of the closed system, and thereby achieve the purpose of auxiliary braking of heavy transport equipment.

[0039] 6. When the accumulator releases energy, the oil in the accumulator enters pipe A or pipe B of the closed circuit, and the excess oil in the closed circuit is discharged through the system flushing circuit, which can accelerate the replacement of the oil in the closed circuit and further improve the heat dissipation condition of the closed system.

[0040] 7. The accumulator can be used as an auxiliary power source to provide hydraulic power for the steering system, suspension system and the like of the equipment, thereby saving the consumption of the power system.

[0041] 8. The energy in the accumulator can directly drive the closed system, reduce the energy conversion link, and improve the energy reuse rate. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.

[0043] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the disclosed content, to be understood and read by those skilled in the art, and are not used to limit the conditions that can be implemented by the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the disclosed technical content.

[0044] Figure 1 A schematic diagram of a pump-controlled motor closed hydraulic drive system in the prior art is shown in Figure 1.

[0045] Figure 2 A schematic diagram of a closed hydraulic drive heavy transport equipment walking braking energy recovery and control system of the present application is shown in Figure 2.

[0046] Figure 3 A schematic diagram of the equipment steering system and suspension system structure of the present application is shown in Figure 3. DETAILED DESCRIPTION

[0047] The embodiments in the present application will be described clearly and completely in the following with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application.

[0048] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail in the following with reference to the drawings and specific embodiments.

[0049] In order to more clearly and thoroughly understand the technical solutions of the present application, the following will be described in detail with reference to the drawings of the embodiments of the present application. Figures 2-3 The test method of the present application is described in detail.

[0050] The technical problem to be solved by the present application is to provide a closed hydraulic drive heavy transport equipment walking braking energy recovery and control system. The system not only realizes the recovery and reuse of the braking energy of the equipment walking, achieves the purpose of energy saving, but also realizes the pressure regulation of the closed circuit when the system brakes, achieves the purpose of adjustable braking force and improves the service life of the hydraulic components. DETAILED DESCRIPTION

[0052] As shown in the accompanying drawings Figure 2 The purpose of the present application is achieved by a heavy equipment closed hydraulic walking drive system brake energy recovery and control system, comprising a control unit 4, an energy storage unit 3, an energy conversion unit 2, an electromagnetic valve control assembly 1, a cartridge valve assembly 5, a pressure sensor assembly;

[0053] The electromagnetic valve control assembly 1 comprises: an electromagnetic control valve 6, an electromagnetic control valve 7, an electromagnetic control valve 9, an electromagnetic control valve 10 and a shuttle valve 8;

[0054] The cartridge valve assembly 5 comprises: a cartridge valve 19, a cartridge valve 20, a cartridge valve 21, a cartridge valve 22;

[0055] The energy conversion unit 2 comprises: a constant displacement motor 12, a variable displacement pump 15, a check valve 11, a check valve 14, an electromagnetic control valve 13, an overflow valve 25; the pressure sensor assembly comprises: a pressure sensor 23, a pressure sensor 24, a pressure sensor 17;

[0056] The energy storage unit 3 comprises: an accumulator 15, an electro-hydraulic proportional flow valve 18, an overflow valve 16; the cartridge valve 19 inlet A and the cartridge valve 20 inlet A are connected with the pipeline A respectively, the cartridge valve 21 inlet A and the cartridge valve 22 inlet A are connected with the pipeline B respectively;

[0057] The cartridge valve 19 outlet B, the cartridge valve 22 outlet B, the electro-hydraulic proportional flow valve 18 outlet B and the constant displacement motor 12 inlet A are connected with each other; the cartridge valve 20 outlet B, the cartridge valve 21 outlet B and the check valve 11 outlet are connected with each other, and the check valve 11 inlet is connected with the constant displacement motor 12 outlet B;

[0058] The cartridge valve 19 control port X is connected with the electromagnetic control valve 7 outlet A, the cartridge valve 20 control port X is connected with the electromagnetic control valve 6 outlet A, the cartridge valve 21 control port X is connected with the electromagnetic control valve 10 outlet A, and the cartridge valve 22 control port X is connected with the electromagnetic control valve 9 outlet A; the electromagnetic control valve 6 outlet T, the electromagnetic control valve 7 outlet T, the electromagnetic control valve 9 outlet T and the electromagnetic control valve 10 outlet T are connected with each other and connected with the oil tank;

[0059] The electromagnetic control valve 6 inlet P, the electromagnetic control valve 7 inlet P, the electromagnetic control valve 9 inlet P and the electromagnetic control valve 10 inlet P are connected with each other and connected with the shuttle valve 8 outlet;

[0060] The two inlets of the shuttle valve 8 are connected with the pressure oil driving pipeline A and the pressure oil driving pipeline B respectively;

[0061] The constant displacement motor 12 drives the variable displacement pump 15 to rotate, the inlet of the variable displacement pump 15 is connected with the oil tank, and the outlet P is connected with the electromagnetic valve 13 inlet P, the accumulator inlet, the overflow valve 16 inlet and the electro-hydraulic proportional flow valve 18 inlet A through the check valve 14.

[0062] The control unit 4 respectively collects the accumulator pressure through the pressure sensor 17, collects the pipeline A pressure through the pressure sensor 23, and collects the pipeline B pressure through the pressure sensor 24.

[0063] The control unit 4 controls the electromagnetic control valve 6, the electromagnetic control valve 7, the electromagnetic control valve 9, the electromagnetic control valve 10, the electromagnetic control valve 13, the variable pump 15, and the electro-hydraulic proportional flow valve 18.

[0064] The walking drive normal mode of the closed hydraulic drive heavy transport equipment walking brake energy recovery and control system is as follows: the control unit 4 issues an instruction to make the electromagnetic control valve 6, the electromagnetic control valve 7, the electromagnetic control valve 9, and the electromagnetic control valve 10 all not be electrified, and make them all work in the normal state. The high-pressure oil selected from the pipeline A or the pipeline B through the shuttle valve 8 enters the P port of the electromagnetic control valve 6, the electromagnetic control valve 7, the electromagnetic control valve 9, and the electromagnetic control valve 10, and then enters the control port X of the cartridge valve 19, the cartridge valve 20, the cartridge valve 21, and the cartridge valve 22 from the outlet A thereof, respectively. Under the action of the high-pressure oil, the inlet and outlet oil ports A and B of the cartridge valve 19, the cartridge valve 20, the cartridge valve 21, and the cartridge valve 22 are all closed. The closed system is driven by the closed pump 101 as a power source to drive the walking motor 104 to rotate, so as to realize the walking drive of the heavy transport equipment.

[0065] The energy recovery mode of the closed hydraulic drive heavy transport equipment walking brake energy recovery and control system is as follows: when the heavy transport equipment is in a downhill or braking working condition, the control unit 4 collects the operation signal and the accumulator 15 pressure signal to determine whether to enter the energy recovery mode; when the conditions are met, the control unit 4 collects the pipeline A and pipeline B pressures to determine which of the pipeline A and the pipeline B is the high-pressure pipeline.

[0066] If the pipeline A is high pressure pipeline: control unit 4 sends control signals to make electromagnetic control valve 7, electromagnetic control valve 10 get electricity, make its outlet A respectively with T port access. Plug-in valve 19 control chamber oil through its control port X, through the A port of electromagnetic control valve 7 back to the oil tank, under the action of pipeline A pressure, plug-in valve 19 valve opening, pipeline A oil from the A port of plug-in valve 19 into B port, and ultimately into the A port of variable displacement pump 12. Variable displacement pump 12 back to the oil from the outlet B through the one-way valve 11 to the B port of plug-in valve 21, plug-in valve 21 control chamber oil through its control port X, through the A port of electromagnetic control valve 10 back to the oil tank, under the action of B port oil pressure, plug-in valve 21 valve opening, back to the oil from the B port of plug-in valve 21 into A, ultimately into the pipeline B. Under the action of pipeline A, pipeline B pressure difference, variable displacement pump 12 drives variable displacement pump 15 rotation, under the given displacement signal of control unit 4, variable displacement pump 15 starts to suck oil from the oil tank, and through the one-way valve 14, pump oil into the accumulator 15. Part of the potential energy or inertia of heavy transport equipment can be converted into pressure energy of oil and stored in the accumulator 15 through the variable displacement pump 15.

[0067] If the pipeline B is high pressure pipeline: control unit 4 sends control signals to make electromagnetic control valve 9, electromagnetic control valve 6 get electricity, make its outlet A respectively with T port access. Plug-in valve 22 control chamber oil through its control port X, through the A port of electromagnetic control valve 9 back to the oil tank, under the action of pipeline B pressure, plug-in valve 22 valve opening, pipeline B oil from the A port of plug-in valve 22 into B port, and ultimately into the A port of variable displacement pump 12. Variable displacement pump 12 back to the oil from the outlet B through the one-way valve 11 to the B port of plug-in valve 20, plug-in valve 20 control chamber oil through its control port X, through the A port of electromagnetic control valve 6 back to the oil tank, under the action of B port oil pressure, plug-in valve 20 valve opening, back to the oil from the B port of plug-in valve 20 into A, ultimately into the pipeline B. Under the action of pipeline A, pipeline B pressure difference, variable displacement pump 12 drives variable displacement pump 15 rotation, under the given displacement signal of control unit 4, variable displacement pump 15 starts to suck oil from the oil tank, and through the one-way valve 14, pump oil into the accumulator 15. Part of the potential energy or inertia of heavy transport equipment can be converted into pressure energy of oil and stored in the accumulator 15 through the variable displacement pump 15.

[0068] Preferably, in the process of energy recovery, when the pipeline A or pipeline B flow is too large, high pressure will be generated at the variable displacement pump 12. In order to avoid high pressure damage to the variable displacement pump, the energy conversion unit 2 is equipped with overflow valve 25. When the pipeline pressure is too high, the pipeline oil can overflow through the overflow valve 25, so as to protect the energy conversion unit.

[0069] Preferably, in the energy recovery process, to limit the outlet pressure of the variable pump 14, prevent high pressure from damaging the energy storage unit 3, the energy storage unit 3 is equipped with an overflow valve 16, when the accumulator 15 reaches a certain pressure, the overflow valve 16 opens the overflow, thereby protecting the energy storage unit.

[0070] Preferably, in the energy recovery process, the control unit 4 can realize the control of the inlet A pressure of the fixed displacement motor 12 by adjusting the displacement of the variable pump 15, and then realize the pressure regulation of the pipeline A or pipeline B, to a certain extent, play the role of regulating the braking force of heavy transport equipment, and can be used as an auxiliary braking mode of heavy transport equipment.

[0071] The above-mentioned closed hydraulic drive heavy transport equipment walking brake energy recovery and control system enters the energy release mode: when the heavy transport equipment starts, the control unit 4 collects the accumulator 15 pressure signal and the driver operation information, and determines whether the accumulator 15 pressure oil drives the pipeline A or the pipeline B according to the operation information.

[0072] If the conditions are met, and it is determined that the accumulator pressure oil drives the pipeline A, the control unit 4 sends a control signal to make the electromagnetic control valve 6 and the electro-hydraulic proportional flow valve 18 electrified. The A and B ports of the electro-hydraulic proportional flow control valve 18 are opened, the accumulator 15 pressure oil passes through the electro-hydraulic proportional flow valve 18 and flows into the B port of the cartridge valve 20. The outlet A of the electromagnetic control valve 6 is connected with the T port, and the control cavity oil of the cartridge valve 20 flows back to the tank through the A port of the electromagnetic control valve 6 from the control port X. Under the action of the oil pressure at the B port, the cartridge valve 20 is opened, and the oil flows from the B port to the A port, and then flows into the pipeline A. The pressure oil in the accumulator 15 finally flows into the pipeline A, drives the walking motor 104 to rotate, and the excess oil in the closed cycle system is discharged through the closed system flushing circuit 105. The closed system is driven by the accumulator 15 as an auxiliary power source to drive the heavy transport equipment in one direction. The control unit 4 can adjust the output flow of the electro-hydraulic proportional flow valve 18 by collecting the amplitude of the operation signal and the pressure of the accumulator 15, to realize the speed control of the heavy transport equipment walking.

[0073] If the conditions are met and it is determined that the accumulator pressure oil is driving line B, control unit 4 issues a control signal to energize solenoid control valve 10 and electro-hydraulic proportional flow valve 18. Ports A and B of electro-hydraulic proportional flow valve 18 open, allowing the pressure oil from accumulator 15 to flow through electro-hydraulic proportional flow valve 18 and into port B of cartridge valve 21. Port A of solenoid control valve 10 connects to port T, and the oil in the control chamber of cartridge valve 21 flows from control port X through port A of solenoid control valve 10 back to the tank. Under the pressure of the oil at port B, cartridge valve 21 opens, allowing oil to flow from port B to port A and then into line B. The pressure oil in accumulator 15 ultimately flows into line B, driving travel motor 104. Excess oil in the closed-circuit system is discharged through closed-system flushing circuit 105. The closed-system uses accumulator 15 as an auxiliary power source to drive the heavy-duty transport equipment in the opposite direction. The control unit 4 can adjust the output flow of the electro-hydraulic proportional flow valve 18 by collecting the amplitude of the operation signal and the pressure of the accumulator 15, thereby realizing speed control of the heavy transport equipment.

[0074] Preferably, when the accumulator 15 performs auxiliary driving, the control unit 4 collects the pressure of the accumulator 15 , and when the pressure drops to a certain level, controls the closed system to switch to the normal travel driving mode.

[0075] Preferably, the accumulator 15 serves as an auxiliary power source and can provide hydraulic power for the equipment steering system 211 and the suspension system 210, thereby saving consumption of the hydraulic power system.

[0076] As attached Figure 3 As shown, the suspension system 210 includes: a suspension cylinder 201 , a balancing valve 202 , a shuttle valve 203 , an electric proportional directional valve 204 , and a pressure compensation valve 205 .

[0077] The steering system 211 includes a steering cylinder 206 , a shuttle valve 207 , an electric proportional directional valve 208 , and a pressure compensation valve 209 .

[0078] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0079] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heavy-duty transport equipment travel brake energy recovery and control system, characterized in that: include: A control unit (4), an energy storage unit (3), an energy conversion unit (2), a solenoid valve control assembly (1), a cartridge valve assembly (5), and a pressure sensor assembly; The solenoid valve control assembly (1) comprises: a solenoid control valve (6), a solenoid control valve (7), a solenoid control valve (9), a solenoid control valve (10) and a shuttle valve (8); The cartridge valve assembly (5) includes: a cartridge valve (19), a cartridge valve (20), a cartridge valve (21), and a cartridge valve (22); The energy conversion unit (2) includes: a fixed displacement motor (12), a variable displacement pump (15), a one-way valve (11), a one-way valve (14), an electromagnetic control valve (13), and a relief valve (25); the pressure sensor assembly includes: a pressure sensor (23), a pressure sensor (24), and a pressure sensor (17); The energy storage unit (3) includes: an accumulator (15, a variable pump 15, and the corresponding abstract reference numerals are modified together, and one number cannot correspond to two features), an electro-hydraulic proportional flow valve (18), and a relief valve (16); an inlet A of a cartridge valve (19) and an inlet A of a cartridge valve (20) are respectively connected to a pipeline A, and an inlet A of a cartridge valve (21) and an inlet A of a cartridge valve (22) are respectively connected to a pipeline B; The outlet B of the cartridge valve (19), the outlet B of the cartridge valve (22), the outlet B of the electro-hydraulic proportional flow valve (18), and the inlet A of the quantitative motor (12) are connected to each other; the outlet B of the cartridge valve (20), the outlet B of the cartridge valve (21), and the outlet of the check valve (11) are connected to each other, and the inlet of the check valve (11) is connected to the outlet B of the quantitative motor (12); The control port X of the cartridge valve (19) is connected to the outlet A of the electromagnetic control valve (7), the control port X of the cartridge valve (20) is connected to the outlet A of the electromagnetic control valve (6), the control port X of the cartridge valve (21) is connected to the outlet A of the electromagnetic control valve (10), and the control port X of the cartridge valve (22) is connected to the outlet A of the electromagnetic control valve (9); the outlet T of the electromagnetic control valve (6), the outlet T of the electromagnetic control valve (7), the outlet T of the electromagnetic control valve (9), and the outlet T of the electromagnetic control valve (10) are connected to each other and connected to the oil tank; The inlet P of the electromagnetic control valve (6), the inlet P of the electromagnetic control valve (7), the inlet P of the electromagnetic control valve (9), and the inlet P of the electromagnetic control valve (10) are connected to each other and to the outlet of the shuttle valve (8); The two inlets of the shuttle valve (8) are connected to the pressure oil driving pipeline A and the pressure oil driving pipeline B respectively; The quantitative motor (12) drives the variable pump (15) to rotate. The inlet of the variable pump (15) is connected to the oil tank, and the outlet P is connected to the inlet P of the solenoid valve (13), the inlet of the accumulator, the inlet of the relief valve (16), and the inlet A of the electro-hydraulic proportional flow valve (18) through the one-way valve (14). The control unit (4) collects the accumulator pressure through the pressure sensor (17), the pressure sensor (23) collects the pressure of the pipeline A, and the pressure sensor (24) collects the pressure of the pipeline B; The control unit (4) controls the electromagnetic control valve (6), the electromagnetic control (7), the electromagnetic control valve (9), the electromagnetic control valve (10), the electromagnetic control valve (13), the variable pump (15), and the electro-hydraulic proportional flow valve (18) respectively.

2. A heavy transport equipment travel brake energy recovery and control system according to claim 1, characterized in that: The normal travel drive mode is as follows: the control unit 4 issues a command to make the electromagnetic control valve 6, the electromagnetic control valve (7), the electromagnetic control valve (9) and the electromagnetic control valve (10) all de-energized, so that they all work in the normal position; the high-pressure oil selected from the pipeline A or the pipeline B through the shuttle valve (8) enters the P port of the electromagnetic control valve (6), the electromagnetic control valve (7), the electromagnetic control valve (9) and the electromagnetic control valve (10) respectively, and enters the control port X of the cartridge valve (19), the cartridge valve (20), the cartridge valve (21) and the cartridge valve (22) respectively from the outlet A thereof; under the action of the high-pressure oil, the oil inlet and outlet A channels and B channels of the cartridge valve (19), the cartridge valve (20), the cartridge valve (21) and the cartridge valve (22) are all closed; the closed system uses the closed pump (101) as a power source to drive the travel motor (104) to rotate, thereby realizing the travel drive of the heavy transport equipment.

3. The heavy-duty transport equipment travel braking energy recovery and control system according to claim 1, characterized in that: The energy recovery mode is as follows: when the heavy transport equipment is in a downhill or braking condition, the control unit (4) collects an operation signal and a pressure signal of the accumulator (15) to determine whether to enter the energy recovery mode; when the conditions are met and the energy recovery mode can be entered, the control unit (4) respectively collects the pressure of pipeline A and pipeline B to determine which of the pipelines A and B is the high-pressure pipeline.

4. A heavy transport equipment travel brake energy recovery and control system as claimed in claim 3, characterized in that: If pipeline A is a high-pressure pipeline: the control unit (4) sends a control signal to respectively energize the electromagnetic control valve (7) and the electromagnetic control valve (10), so that their outlets A are connected to the T port respectively; the oil in the control chamber of the cartridge valve (19) flows back to the oil tank through its control port X and the A port of the electromagnetic control valve (7); under the action of the pressure of pipeline A, the valve port of the cartridge valve (19) opens, and the oil in pipeline A flows from the A port of the cartridge valve (19) to the B port, and finally flows into the A port of the quantitative motor (12); the return oil of the quantitative motor (12) flows from the outlet B through the one-way valve (11) to the B port of the cartridge valve (21), and the oil in the control chamber of the cartridge valve (21) flows through its The control port X flows back to the oil tank through the port A of the electromagnetic control valve (10). Under the action of the oil pressure at the port B, the valve port of the cartridge valve (21) opens, and the return oil flows from the port B of the cartridge valve (21) into the port A, and finally flows into the pipeline B. Under the action of the pressure difference between pipelines A and B, the quantitative motor (12) drives the variable pump (15) to rotate. Under the displacement signal given by the control unit (4), the variable pump (15) starts to absorb oil from the oil tank and pumps the oil into the accumulator (15) through the one-way valve (14). Part of the potential energy or inertia of the heavy transport equipment is converted into the pressure energy of the oil through the variable pump (15) and stored in the accumulator (15). If pipeline B is a high-pressure pipeline: the control unit (4) sends a control signal to energize the electromagnetic control valve (9) and the electromagnetic control valve (6), so that their outlets A are connected to the T port respectively; the oil in the control chamber of the cartridge valve (22) flows back to the oil tank through its control port X and the A port of the electromagnetic control valve (9); under the pressure of pipeline B, the valve port of the cartridge valve (22) opens, and the oil in pipeline B flows from the A port of the cartridge valve (22) to the B port, and finally flows into the A port of the quantitative motor (12); the return oil of the quantitative motor (12) flows from its outlet B through the one-way valve (11) to the B port of the cartridge valve (20), and the oil in the control chamber of the cartridge valve (20) flows through its control port X and the A port of the electromagnetic control valve (9). The oil flows back to the oil tank through the port A of the electromagnetic control valve (6) through the port X. Under the action of the oil pressure at the port B, the valve port of the cartridge valve (20) opens, and the return oil flows into the port A from the port B of the cartridge valve (20), and finally flows into the pipeline B. Under the action of the pressure difference between pipelines A and B, the quantitative motor (12) drives the variable pump (15) to rotate. Under the displacement signal given by the control unit (4), the variable pump (15) starts to absorb oil from the oil tank and pumps the oil into the accumulator (15) through the one-way valve (14). Part of the potential energy or inertia of the heavy transport equipment is converted into the pressure energy of the oil through the variable pump (15) and stored in the accumulator (15).

5. The heavy-duty transport equipment travel brake energy recovery and control system according to claim 3, characterized in that: During the energy recovery process, when the flow rate of pipeline A or pipeline B is too large, high pressure will be generated at the quantitative motor (12). In order to prevent the high pressure from damaging the quantitative motor, the energy conversion unit (2) is equipped with a relief valve (25). When the pipeline pressure is too high, the pipeline oil can overflow through the relief valve (25), thereby protecting the energy conversion unit.

6. The heavy-duty transport equipment travel braking energy recovery and control system according to claim 3, characterized in that: During the energy recovery process, the control unit (4) can control the pressure of the inlet A of the quantitative motor (12) by adjusting the displacement of the variable pump (15), thereby adjusting the pressure of the pipeline A or the pipeline B, and to a certain extent plays a role in adjusting the braking force of the heavy transport equipment, and can be used as an auxiliary braking method for the heavy transport equipment.

7. The heavy transport equipment travel brake energy recovery and control system according to claim 3, characterized in that: During the energy recovery process, in order to limit the outlet pressure of the variable pump (14) and prevent the high pressure from damaging the energy storage unit (3), the energy storage unit (3) is equipped with a relief valve (16). When the accumulator (15) reaches a certain pressure, the relief valve (16) opens to overflow, thereby protecting the energy storage unit.

8. The heavy transport equipment travel braking energy recovery and control system according to claim 1, characterized in that: Entering the energy release mode: when the heavy transport equipment starts, the control unit (4) collects the pressure signal of the accumulator (15) and the driver's operation information, and determines whether the pressure oil of the accumulator (15) drives the pipeline A or the pipeline B according to the operation information; If the conditions are met and it is determined that the accumulator pressure oil drives the pipeline A, the control unit 4 sends a control signal to energize the electromagnetic control valve (6) and the electro-hydraulic proportional flow valve (18); the A and B port channels of the electro-hydraulic proportional flow control valve (18) are opened, and the accumulator (15) pressure oil flows through the electro-hydraulic proportional flow valve (18) and into the B port of the cartridge valve (20); the outlet A of the electromagnetic control valve (6) is connected to the T port, and the oil in the control chamber of the cartridge valve (20) flows from the control port X through the A port of the electromagnetic control valve (6) back to the oil tank; under the action of the oil pressure at the B port, the cartridge valve (20) When the switch is opened, the oil flows from port B to port A and then flows into pipeline A. The pressure oil in the accumulator (15) finally flows into pipeline A, driving the travel motor (104) to rotate. The excess oil in the closed circulation system is discharged through the closed system flushing circuit (105). The closed system uses the accumulator (15) as an auxiliary power source to drive the heavy transport equipment to travel in one direction. The control unit (4) can adjust the output flow of the electro-hydraulic proportional flow valve (18) by collecting the amplitude of the operation signal and the pressure of the accumulator (15), thereby realizing speed control of the heavy transport equipment. If the conditions are met and it is determined that the accumulator pressure oil drives the pipeline B, the control unit (4) sends a control signal to energize the electromagnetic control valve (10) and the electro-hydraulic proportional flow valve (18); the A and B ports of the electro-hydraulic proportional flow control valve (18) are opened, and the pressure oil of the accumulator (15) flows through the electro-hydraulic proportional flow valve (18) to the B port of the cartridge valve (21); the outlet A of the electromagnetic control valve (10) is connected to the T port, and the oil in the control chamber of the cartridge valve (21) flows from the control port X to the A port of the electromagnetic control valve (10) and back to the oil tank; under the action of the oil pressure at the B port, the cartridge valve (21) is opened, and the oil flows from port B to port A and then flows into pipeline B. The pressure oil in the accumulator (15) finally flows into pipeline B, driving the travel motor (104) to rotate. The excess oil in the closed circulation system is discharged through the closed system flushing circuit (105). The closed system uses the accumulator (15) as an auxiliary power source to drive the heavy transport equipment to travel in the opposite direction; the control unit 4 can adjust the output flow of the electro-hydraulic proportional flow valve (18) by collecting the amplitude of the operation signal and the pressure of the accumulator (15), thereby realizing the speed control of the heavy transport equipment.

9. A heavy transport equipment travel brake energy recovery and control system according to claim 8, characterized in that: When the accumulator (15) performs auxiliary driving, the control unit (4) collects the pressure of the accumulator (15), and when the pressure drops to a certain level, controls the closed system to switch to the normal travel driving mode.

10. The heavy transport equipment travel brake energy recovery and control system according to claim 8, characterized in that: The accumulator (15) serves as an auxiliary power source and can provide hydraulic power for the equipment steering system (211) and suspension system (210). The suspension system (210) includes: a suspension cylinder (201), a balancing valve (202), a shuttle valve (203), an electric proportional directional valve (204), and a pressure compensation valve (205); The steering system (211) includes a steering cylinder (206), a shuttle valve (207), an electric proportional directional valve (208), and a pressure compensation valve (209).

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