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CN-122009116-A - Double-safety redundant hydraulic braking system and braking method

CN122009116ACN 122009116 ACN122009116 ACN 122009116ACN-122009116-A

Abstract

The invention discloses a double-safety redundant hydraulic braking system and a braking method, wherein the system comprises an oil inlet oil way, a first oil supply oil way, a second oil supply oil way, a first braking oil way, a second braking oil way and an electric control valve group module which are mutually independent and are used for supplying energy to a front axle and a rear axle respectively, the electric control valve group module comprises a braking foot valve, a first electromagnetic valve, a second electromagnetic valve, a switching control valve and a third oil supply oil way, the braking foot valve is connected with the first oil supply oil way and the braking oil way, the first electromagnetic valve is arranged on the second oil supply oil way, the switching control valve is arranged on the braking oil way and is connected with the second oil supply oil way, two stations of the braking oil way is respectively communicated with the braking foot valve and the second oil supply oil way, and the third oil supply oil way is provided with a second electromagnetic valve and is connected with a parking braking mechanism. The system realizes braking pressure maintaining, anti-sliding and emergency parking through the double oil way redundancy and the linkage of the electric control valve group, and improves the braking safety and reliability. The invention solves the problems of vehicle sliding and insufficient braking redundancy of the existing system.

Inventors

  • ZHAN XIAOPENG

Assignees

  • 泉州鑫豪工程机械科技有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (9)

  1. 1. The double-safety redundant hydraulic braking system is characterized by comprising an oil inlet circuit, an oil supply circuit module, a braking circuit module and an electric control valve group module; The oil supply circuit module comprises a first oil supply circuit and a second oil supply circuit which are mutually independent, and liquid inlet ends of the first oil supply circuit and the second oil supply circuit are communicated with the oil inlet circuit; the brake oil circuit module comprises a first brake oil circuit and a second brake oil circuit which are mutually independent, and the first brake oil circuit and the second brake oil circuit respectively supply energy to brake elements of a rear axle and a front axle; The electric control valve group module comprises a brake foot valve, a first electromagnetic valve, a second electromagnetic valve, a switching control valve and a third oil supply oil way, wherein the liquid inlet end of the brake foot valve is connected with the first oil supply oil way, the liquid outlet end of the brake foot valve is connected with the first oil supply oil way and the second oil supply oil way, the first electromagnetic valve is arranged at the liquid inlet end of the second oil supply oil way, the switching control valve is arranged on the first oil supply oil way and the second oil supply oil way and is connected with the second oil supply oil way, the switching control valve is provided with a first station and a second station, when the switching control valve is positioned at the first station, the first brake oil way and the second brake oil way are communicated with the second oil supply oil way, the liquid inlet end of the third oil supply oil way is connected with the oil inlet oil way and is provided with a second electromagnetic valve, and the liquid outlet end of the third oil supply oil way is connected with the parking brake mechanism.
  2. 2. The dual safety redundant hydraulic brake system of claim 1, wherein the oil inlet circuit is provided with a detection oil circuit and a pressure monitoring assembly, the liquid inlet end of the oil inlet circuit is provided with a load sensitive pump, the detection oil circuit is provided with a liquid filling electromagnetic valve, the liquid filling electromagnetic valve is connected with an Ls loop of the load sensitive pump, the pressure monitoring assembly comprises a first pressure switch and a second pressure switch which are arranged in parallel, and the first pressure switch and the second pressure switch are electrically connected with the electric control system.
  3. 3. The dual-safety redundant hydraulic braking system according to claim 1, further comprising an explosion-proof interlocking valve set, wherein the explosion-proof interlocking valve set comprises a first explosion-proof interlocking valve and a second explosion-proof interlocking valve, the first explosion-proof interlocking valve is installed at the liquid outlet end of a first braking oil path, a first pipeline and a second pipeline connected with a rear axle braking element are arranged at the liquid outlet end of the first explosion-proof interlocking valve, the second explosion-proof interlocking valve is installed at the liquid outlet end of a second braking oil path, and a third pipeline and a fourth pipeline connected with a front axle braking element are arranged at the liquid outlet end of the second explosion-proof interlocking valve.
  4. 4. The dual safety redundant hydraulic brake system of claim 3, wherein the first explosion-proof interlock valve has a first control end, a second control end, an initial position, a first control position, and a second control position, wherein the first explosion-proof interlock valve is positioned in the initial position, the first brake oil path is communicated with the first pipeline and the second pipeline, and the first brake oil path is communicated with the second pipeline and the first pipeline is blocked when the first explosion-proof interlock valve is positioned in the first control position; The second explosion-proof interlocking valve is provided with a third control end and a fourth control end and is provided with an initial position, a third control position and a fourth control position, when the second explosion-proof interlocking valve is located at the initial position, the second brake oil way is communicated with the third pipeline and the fourth pipeline, when the second explosion-proof interlocking valve is located at the third control position, the second brake oil way is communicated with the fourth pipeline and the third pipeline is blocked, and when the second explosion-proof interlocking valve is located at the fourth control position, the second brake oil way is communicated with the third pipeline and the fourth pipeline is blocked.
  5. 5. A dual safety redundant hydraulic braking method based on the dual safety redundant hydraulic braking system of any one of claims 1-4, comprising a conventional braking dwell procedure, a detonation tube braking procedure, an emergency parking braking procedure, and a hydraulic automatic energy supplementing procedure, the conventional braking dwell procedure comprising: S101, switching a control valve to be at a first station, wherein an operator steps on a brake foot valve, and hydraulic pressure of a first oil supply oil way enters a first brake oil way and a second brake oil way through the brake foot valve to provide compaction for brake elements of a front axle and a rear axle to be braked; And S102, after the excavator brakes, an operator opens a switching control valve to switch the excavator to a second station, meanwhile, an electric control system controls a first electromagnetic valve to be electrified, and the hydraulic pressure of a second oil supply oil way continuously enters a first brake oil way and a second brake oil way through the switching control valve to realize pressure maintaining of the brake oil way, and a brake element still maintains a braking state after a brake foot valve is released.
  6. 6. The dual safety redundant hydraulic brake system of claim 5 wherein the explosion proof tube brake flow path includes a rear axle explosion proof tube flow path and a front axle explosion proof tube flow path; When the second pipeline bursts or decompresses, the second control end senses the oil pressure change, the first explosion-proof interlocking valve is switched to the second control position, the second pipeline is blocked, the first brake oil way continuously supplies pressure to the second pipeline, and the single pipeline of the rear axle is braked; The front axle explosion-proof pipe flow comprises the steps that when a third pipeline bursts or is depressurized, a third control end of a second explosion-proof interlocking valve senses oil pressure change, the second explosion-proof interlocking valve is switched to a third control position, the third pipeline is blocked, a second brake oil way continuously supplies pressure to a fourth pipeline, the front axle single pipeline keeps braking, when the fourth pipeline bursts or is depressurized, a fourth control end senses oil pressure change, the second explosion-proof interlocking valve is switched to a fourth control position, the fourth pipeline is blocked, the second brake oil way continuously supplies pressure to the third pipeline, and the front axle single pipeline keeps braking.
  7. 7. The dual safety redundant hydraulic brake system of claim 5 wherein the emergency park brake flow comprises: s301, when equipment is started, if the braking pressure of an oil inlet oil way does not reach a preset value, an electric control system controls a second electromagnetic valve to be powered off, a third oil supply oil way is disconnected, a parking braking mechanism cannot release parking, and the equipment is prohibited from walking; s302, in the running or operation process of the device, if the braking pressure disappears or suddenly drops, the oil pressure of a third oil supply way synchronously reduces, and a parking braking mechanism automatically triggers parking to realize the purpose of pressure loss, namely parking; And S303, after the braking pressure is restored to a preset value, the electric control system controls the second electromagnetic valve to be electrified, and the third oil supply way is electrified with hydraulic pressure to release the parking brake.
  8. 8. The dual safety redundant hydraulic brake system of claim 5 wherein the hydraulic automatic energy charging process is: S401, detecting the oil pressure of an oil inlet circuit in real time by a first pressure switch and a second pressure switch, transmitting signals to an electric control system, and logically judging double-pressure switch signals by the electric control system; S402, if the electric control system judges that the braking pressure is lower than a preset value, controlling the charging electromagnetic valve to be electrified, connecting a braking pressure signal into an Ls loop of the load sensitive pump, and waking up the load sensitive pump to increase output to supplement energy for an oil inlet oil path; And S403, after the braking pressure is restored to a preset value, the electric control system controls the liquid filling electromagnetic valve to be powered off, the connection with the Ls loop is disconnected, the load sensitive pump restores the conventional output, and in the energy supplementing process, the load sensitive pump slowly lifts the load through the damping valve on the Ls loop, so that the engine rotating speed is ensured to be stable.
  9. 9. The dual safety redundant hydraulic brake system of claim 5 wherein the signal logic decision rule of the electrical control system for the dual pressure switch is: The first pressure switch and the second pressure switch are both disconnected, so that the brake system has no brake pressure, an alarm is triggered, and the equipment operation is forbidden; The first pressure switch is opened, the second pressure switch is closed, the fault of the braking system is represented, an alarm is triggered, and a hydraulic automatic energy supplementing process is started; the first pressure switch and the second pressure switch are both closed, which means that the braking pressure is normal and the system operates normally; the first pressure switch is closed, the second pressure switch is opened, the fault of the braking system is indicated, an alarm is triggered, and the hydraulic automatic energy supplementing process is started.

Description

Double-safety redundant hydraulic braking system and braking method Technical Field The invention relates to a hydraulic braking system, in particular to a double-safety redundant hydraulic braking system and a braking method. Background With the development of engineering machinery intellectualization and safety, a hydraulic braking system has become a mainstream braking mode of equipment such as an excavator due to the advantages of rapid braking response, stable braking force and the like. In order to solve the problem of braking failure of the whole vehicle caused by single-pipeline pipe explosion of the traditional hydraulic braking system, the explosion-proof pipe hydraulic braking system with the control valve is developed in the related technology, and the system can block a fault pipeline when the single pipeline is depressurized through station switching of the control valve, so that normal braking of the other pipeline is ensured, and the explosion-proof pipe safety performance of the system is effectively improved. However, the brake control logic of the conventional explosion-proof pipe hydraulic brake system still has the defects that the brake is applied and released by relying on a two-way brake foot valve, and when an operator releases a foot brake, the brake foot valve can control a brake oil way to complete pressure release, so that the hydraulic driving force of the brake system is completely disappeared, and a brake element is restored to an unconstrained state. In the actual operation process, the excavator is often required to temporarily stop under inclined working conditions such as a ramp, a foundation pit edge and the like, the equipment is very easy to slide in a hydraulic braking-free state after the foot brake is released, a corresponding pressure maintaining mechanism or an emergency braking structure is not arranged in the conventional system, continuous braking force cannot be provided for a braking element after the foot brake is released, and the equipment faces extremely large potential safety hazards of slide in the car. Meanwhile, the integrated design of the oil way of the existing hydraulic braking system only focuses on energy supply efficiency and structural simplification, the anti-slip function is not combined with the existing explosion-proof pipe structure, the hydraulic pressure of a braking oil way only exists when a foot brake is applied, the braked oil way has no pressure maintaining and energy storage capacity, and a braking element cannot be continuously driven, so that the system can finish the protection of the explosion-proof pipe, meanwhile, the problem of slip is difficult to solve, the safe application of the hydraulic braking system under the complex working condition is restricted, and therefore, the existing system is required to be improved, and the defect of the anti-slip function is overcome. In view of the above, the present inventors have made intensive studies to solve the above problems, and have made the present application. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a double-safety redundant hydraulic braking system and a braking method, which can effectively solve the technical problems. In order to achieve the above purpose, the invention is realized by the following technical scheme: a double-safety redundant hydraulic braking system comprises an oil inlet circuit, an oil supply circuit module, a braking circuit module and an electric control valve group module; The oil supply circuit module comprises a first oil supply circuit and a second oil supply circuit which are mutually independent, and liquid inlet ends of the first oil supply circuit and the second oil supply circuit are communicated with the oil inlet circuit; the brake oil circuit module comprises a first brake oil circuit and a second brake oil circuit which are mutually independent, and the first brake oil circuit and the second brake oil circuit respectively supply energy to brake elements of a rear axle and a front axle; The electric control valve group module comprises a brake foot valve, a first electromagnetic valve, a second electromagnetic valve, a switching control valve and a third oil supply oil way, wherein the liquid inlet end of the brake foot valve is connected with the first oil supply oil way, the liquid outlet end of the brake foot valve is connected with the first oil supply oil way and the second oil supply oil way, the first electromagnetic valve is arranged at the liquid inlet end of the second oil supply oil way, the switching control valve is arranged on the first oil supply oil way and the second oil supply oil way and is connected with the second oil supply oil way, the switching control valve is provided with a first station and a second station, when the switching control valve is positioned at the first station, the first brake oil way and the second brake oil way are communicated with the second oil