CN109552296B

CN109552296B - Dual mode auto-switching trailer brake system

Info

Publication number: CN109552296B
Application number: CN201811435443.8A
Authority: CN
Inventors: 方波; 黄家银; 吴振谱; 周磊; 陈学斌
Original assignee: Hubei Sanjiang Space Wanshan Special Vehicle Co Ltd
Current assignee: Hubei Sanjiang Space Wanshan Special Vehicle Co Ltd
Priority date: 2018-11-28
Filing date: 2018-11-28
Publication date: 2021-04-13
Anticipated expiration: 2038-11-28
Also published as: CN109552296A

Abstract

The invention discloses a dual-mode automatic switching trailer braking system, which comprises: the air storage cylinder, the emergency relay valve, the shuttle valve, the pneumatic control reversing valve, the electromagnetic reversing valve, the manual reversing valve, the quick release valve, the brake air chamber and the relay valve; the air storage cylinder is connected with an air source pipeline of the power unit, the shuttle valve is connected with a braking control pipeline of the power unit, and the emergency relay valve is connected with a braking control pipeline of the tractor and the air source pipeline of the tractor; the air cylinder is also connected with an emergency relay valve, a manual reversing valve and a relay valve respectively, the shuttle valve is connected with the emergency relay valve and the first relay valve respectively, the pneumatic control reversing valve is also connected with a tractor air source pipeline and an electromagnetic reversing valve, the electromagnetic reversing valve is also connected with a quick release valve, and the quick release valve is also connected with a brake air chamber and the relay valve respectively. Through the technical scheme of the invention, the parking braking state of the trailer can be automatically released when the corresponding pipeline of the tractor is connected, and the self-walking mode is switched to the traction mode.

Description

Dual mode auto-switching trailer brake system

Technical Field

The invention relates to the technical field of vehicle braking, in particular to a dual-mode automatic switching trailer braking system.

Background

A special trailer with double power modes mainly has two working conditions: in the traction mode, the tractor drives in a traction mode, at the moment, the trailer braking system is connected with the tractor braking system, the tractor provides an air source, and the tractor controls the trailer to brake; under the self-walking mode, the tractor is separated from the trailer, and at the moment, the trailer braking system provides an air source for the trailer by a power unit on the trailer and controls the trailer to brake by the power unit.

In the self-walking mode, the braking system is electrically controlled by the power unit, and in order to ensure safety, the trailer is required to automatically park and brake when the power unit is in power failure or an electric circuit has a power failure, and the parking brake can be released only when the power unit electric control system works normally.

In the traction mode, the power unit stops working, and the problem of releasing the parking brake under the condition that the power unit does not work needs to be solved at the moment.

Disclosure of Invention

In order to solve at least one of the problems, the invention provides a dual-mode automatic switching trailer braking system, wherein after being connected with an air source pipeline of a tractor through a quick-change connector, an air control reversing valve is filled with air, and at the moment, the air in an air storage cylinder is communicated into a brake air chamber through a manual reversing valve, the air control reversing valve, an electromagnetic reversing valve and a quick release valve so as to relieve the parking braking state of the trailer, thereby realizing the automatic switching from a self-walking mode to a traction mode.

To achieve the above object, the present invention provides a dual mode auto-switching trailer brake system, comprising: the air storage cylinder, the emergency relay valve, the shuttle valve, the pneumatic control reversing valve, the electromagnetic reversing valve, the manual reversing valve, the quick release valve, the brake air chamber and the relay valve, wherein the relay valve comprises a first relay valve, a second relay valve and a third relay valve; the air storage cylinder is connected with an air source pipeline of the power unit, the shuttle valve is connected with a braking control pipeline of the power unit, and the emergency relay valve is connected with a braking control pipeline of the tractor and the air source pipeline of the tractor; the air storage cylinder is further connected with the emergency relay valve, the manual reversing valve and the relay valve respectively, the shuttle valve is connected with the emergency relay valve and the first relay valve respectively, the manual reversing valve is further connected with the pneumatic control reversing valve and the electromagnetic reversing valve respectively, the pneumatic control reversing valve is further connected with the tractor air source pipeline and the electromagnetic reversing valve, the electromagnetic reversing valve is further connected with the quick release valve, and the quick release valve is further connected with the brake air chamber and the relay valve respectively.

In the above technical solution, preferably, 1 port of the air reservoir is connected to the air source pipeline of the power unit, 2 ports are connected to 12 ports of the emergency relay valve, 3 ports are connected to 1 port of the manual directional valve, and 4 ports are respectively connected to 1 port of the first relay valve, 1 port of the second relay valve, and 1 port of the third relay valve; a port 1 of the shuttle valve is connected with a brake control pipeline of the power unit, a port 2 of the shuttle valve is connected with a port 2 of the emergency relay valve, a port 3 of the shuttle valve is connected with a port 4 of the first relay valve, a port 11 of the emergency relay valve is connected with an air source pipeline of the tractor, and a port 4 of the emergency relay valve is connected with a brake control pipeline of the tractor; a port 1 of the pneumatic control reversing valve is connected with a port 4 of the electromagnetic reversing valve, a port 6 of the pneumatic control reversing valve is connected with an air source pipeline of the tractor, ports 2 and 3 of the pneumatic control reversing valve are plugged, and a port 5 of the pneumatic control reversing valve is an exhaust port; 2 ports of the manual reversing valve are respectively connected with 4 ports of the pneumatic control reversing valve and 3 ports of the electromagnetic reversing valve, and 3 ports of the manual reversing valve are exhaust ports; the 11 ports of the emergency relay valve are connected with the air source pipeline of the tractor, and the 4 ports of the emergency relay valve are connected with the brake control pipeline of the tractor; 2 ports of the electromagnetic directional valve are connected with 12 ports of the quick release valve, 1 port is blocked, and 5 ports are exhaust ports; the brake air chambers comprise a first brake air chamber, a second brake air chamber, a third brake air chamber and a fourth brake air chamber, the 2 ports of the first relay valve are respectively connected with the 4 ports of the second relay valve and the 4 ports of the third relay valve, the 3 ports of the first relay valve, the second relay valve and the third relay valve are exhaust ports, the 2 port of the second relay valve is respectively connected with the 11 port of the first brake air chamber and the 11 port of the fourth brake air chamber, the port 2 of the third relay valve is respectively connected with the port 11 of the second brake air chamber and the port 11 of the third brake air chamber, and 2 ports of the quick release valve are respectively connected with the 12 ports of the first brake chamber, the 12 ports of the second brake chamber, the 12 ports of the third brake chamber and the 12 ports of the fourth brake chamber, and 3 ports of the quick release valve are exhaust ports.

In the above technical solution, preferably, the port 11 is communicated with the port 12 when the port 4 of the emergency relay valve has no control air pressure, and both the port 11 and the port 12 are communicated with the port 2 when the port has control air pressure; one port with higher pressure in the ports 1 and 2 of the shuttle valve is communicated with the port 3 of the shuttle valve; when the hand-operated reversing valve is in a normal state, the port 1 is communicated with the port 2, and when the handle is pulled, the port 2 is communicated with the port 3; when the 6 ports have no air pressure, the 1 port of the pneumatic control reversing valve is communicated with the 5 ports, the 2 port of the pneumatic control reversing valve is communicated with the 4 ports, when the 6 ports have air pressure, the 1 port of the pneumatic control reversing valve is communicated with the 4 ports, and the 2 port of the pneumatic control reversing valve is communicated with the 3 ports; when the electromagnetic directional valve is not electrified, the port 1 is communicated with the port 5, the port 2 is communicated with the port 4, when the electromagnetic directional valve is electrified, the port 1 is communicated with the port 4, and the port 2 is communicated with the port 3; one of the 11 ports and the 12 ports of the quick release valve with higher pressure is communicated with the 2 ports thereof, and the 2 ports are communicated with the 3 ports when the 11 ports and the 12 ports are not aerated; the first relay valve, the second relay valve and the third relay valve are all provided with 2 ports communicated with 3 ports when 4 ports of the first relay valve, the second relay valve and the third relay valve are not provided with air pressure, and 1 port of the first relay valve, the second relay valve and the third relay valve is communicated with 2 ports when 4 ports of the first relay valve, the second relay valve and the third relay valve are provided with air pressure; the trailer is in a parking braking state when 12 ports of the first brake air chamber, the second brake air chamber, the third brake air chamber and the fourth brake air chamber are all air-free, is in a brake releasing state when 11 ports of the trailer are all air-free and 12 ports of the trailer are all air-free, and is in a service braking state when 11 ports and 12 ports of the trailer are all air-free.

In the above technical solution, preferably, the trailer brake system is provided on a trailer, the power unit is provided on the trailer, the trailer is in a traction mode when being pulled by a tractor, and the trailer is in a self-walking mode when being separated from the tractor.

In the above technical scheme, preferably, under the traction mode, power unit closes, power unit air supply pipeline with power unit brake control pipeline is closed, 1 mouthful and 5 mouthful intercommunications, 2 mouthful and 4 mouthful intercommunications of solenoid directional valve when not being electrified, tractor air supply pipeline passes through 11 mouthful and 12 mouthful of emergent relay valve to the gas receiver air feed, simultaneously tractor air supply pipeline intercommunication 6 mouths of gas accuse switching-over valve, 1 mouthful and 4 mouthful intercommunications, 2 mouths and 3 mouths's intercommunications of gas accuse switching-over valve.

In the above technical scheme, preferably, under the self-walking mode, the tractor with the trailer separation, tractor air supply pipeline with the disconnection of tractor braking control pipeline, urgent relay valve closes, 6 mouths no atmospheric pressure of gas accuse switching-over valve, power unit air supply pipeline is to the gas receiver air feed.

In the above technical solution, preferably, a first quick-change connector is disposed on the tractor brake control pipeline, and a second quick-change connector is disposed on the tractor air source pipeline.

Compared with the prior art, the invention has the beneficial effects that: after the quick change connector is connected with a control pipeline and an air source pipeline of the tractor, the emergency relay valve and the air-controlled reversing valve are ventilated, at the moment, air in the air storage cylinder is communicated into the brake air chamber through the manual reversing valve, the air-controlled reversing valve, the electromagnetic reversing valve and the quick release valve, so that the parking brake state of the trailer is relieved, and the automatic self-walking mode is automatically switched to the traction mode.

Drawings

FIG. 1 is a schematic illustration of the braking concept of the disclosed dual mode auto-switching trailer braking system according to one embodiment of the present invention.

In the drawings, the correspondence between each component and the reference numeral is:

1. a power unit brake control pipeline, 2 a power unit air source pipeline, 3 an air storage cylinder, 4 a first air path, 5 a second air path, 6 a first relay valve, 7 a third air path, 8 a fourth air path, 9 a fifth air path, 10 a second relay valve, 11 a sixth air path, 12 a first brake air chamber, 13 a seventh air path, 14 a second brake air chamber, 15 an eighth air path, 16 a ninth air path, 17 a tenth air path, 18 an eleventh air path, 19 a third relay valve, 20 a twelfth air path, 21 a thirteenth air path, 22 a fourteenth air path, 23 a fifteenth air path, 24 a manual reversing valve, 25 a sixteenth air path, 26 a seventeenth air path, 27 an eighteenth air path, 28 a third brake air chamber, 29 a nineteenth air path, 30 a fourth brake air chamber, 31 a twentieth air path, 32 a twenty-first air path, 33 a quick release valve, 34. the emergency relay valve comprises a twenty-second air passage, 35 parts of an electromagnetic directional valve, 36 parts of a twenty-third air passage, 37 parts of a twenty-fourteen air passage, 38 parts of an air control directional valve, 39 parts of a twenty-fifth air passage, 40 parts of a twenty-sixth air passage, 41 parts of a twenty-seventh air passage, 42 parts of a twenty-eighth air passage, 43 parts of a twenty-ninth air passage, 44 parts of an emergency relay valve, 45 parts of a tractor air source pipeline, 46 parts of a first quick-change connector, 47 parts of a tractor brake control pipeline, 48 parts of a second quick-change connector and 49 parts of a shuttle valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The invention is described in further detail below with reference to the attached drawing figures:

as shown in fig. 1, a dual mode auto-switching trailer brake system according to the present invention comprises: the air storage cylinder 3, the emergency relay valve 44, the shuttle valve 49, the pneumatic control reversing valve 38, the electromagnetic reversing valve 35, the manual reversing valve 24, the quick release valve 33, the brake air chamber and the relay valve, wherein the relay valve comprises a first relay valve 6, a second relay valve 10 and a third relay valve 19; the air cylinder 3 is connected with the power unit air source pipeline 2, the shuttle valve 49 is connected with the power unit brake control pipeline 1, and the emergency relay valve 44 is connected with the tractor brake control pipeline 47 and the tractor air source pipeline 45; the air cylinder 3 is also connected with an emergency relay valve 44, a manual reversing valve 24 and a relay valve respectively, the shuttle valve 49 is connected with the emergency relay valve 44 and the first relay valve 6 respectively, the manual reversing valve 24 is also connected with an air control reversing valve 38 and an electromagnetic reversing valve 35 respectively, the air control reversing valve 38 is also connected with a tractor air source pipeline 45 and the electromagnetic reversing valve 35, the electromagnetic reversing valve 35 is also connected with a quick release valve 33, and the quick release valve 33 is also connected with a brake air chamber and the relay valve respectively.

In the above embodiment, preferably, 1 port of the air reservoir 3 is connected to the power unit

air supply pipeline

2, 2 ports are connected to the 12 ports of the emergency relay valve 44 through the twenty-eighth air passage 42, 3 ports are connected to the 1 port of the manual directional valve 24 through the fifteenth air passage 23, and 4 ports are connected to the 1 port of the first relay valve 6, the 1 port of the second relay valve 10 and the 1 port of the third relay valve 19 through the first air passage 4, the second air passage 5, the fourth air passage 8, the fifth air passage 9 and the sixth air passage 11 respectively; a port 1 of the shuttle valve 49 is connected with a power unit brake control pipeline 1, a port 2 is connected with a port 2 of the emergency relay valve 44 through a twenty-seventh air path 41, a port 3 is connected with a port 4 of the first relay valve 6 through a twenty-sixth air path 40, a port 11 of the emergency relay valve 44 is connected with a tractor air source pipeline 45, and a port 4 is connected with a tractor brake control pipeline 47; a port 1 of the pneumatic control reversing valve 38 is connected with a port 4 of the electromagnetic reversing valve 35 through a twenty-fourth gas path 37, a port 6 is connected with a tractor gas source pipeline 45 through a twenty-ninth gas path 43, ports 2 and 3 are plugged, and a port 5 is an exhaust port; 2 ports of the manual reversing valve 24 are respectively connected with 4 ports of the pneumatic reversing valve 38 through a twenty-fifth gas path 39 and connected with 3 ports of the electromagnetic reversing valve 35 through a twenty-third gas path 36, and 3 ports of the manual reversing valve 24 are exhaust ports; the 11 ports of the emergency relay valve 44 are connected with a tractor air source pipeline 45, and the 4 ports are connected with a tractor brake control pipeline 47; 2 ports of the electromagnetic directional valve 35 are connected with 12 ports of the quick release valve 33 through a twelfth air passage 34, 1 port is blocked, and 5 ports are exhaust ports; the brake air chambers comprise a first brake air chamber 12, a second brake air chamber 14, a third brake air chamber 28 and a fourth brake air chamber 30, wherein 2 ports of the first relay valve 6 are respectively connected with 4 ports of the second relay valve 10 and 4 ports of the third relay valve 19 through a third air passage 7, a twelfth air passage 20 and a thirteenth air passage 21, 3 ports of the first relay valve 6, the second relay valve 10 and the third relay valve 19 are exhaust ports, 2 ports of the second relay valve 10 are respectively connected with 11 ports of the first

brake air chamber

12 and 11 ports of the fourth brake air chamber 30 through a tenth air passage 17 and a

fourteenth air passage

22, 2 ports of the third relay valve 19 are respectively connected with 11 ports of the second brake air chamber 14 and the third brake air chamber 28 through a ninth air passage 16 and a

sixteenth air passage

25, and 2 ports of the quick release valve 33 are respectively connected with twenty-gas passages 31, nineteenth air passage 29, eighteenth air passage 27, seventeenth air passage 26 and a twenty-gas passage 31, An eleventh air passage 18, an eighth air passage 15 and a seventh air passage 13 are connected with the 12 port of the first brake air chamber 12, the 12 port of the second brake air chamber 14, the 12 port of the third brake air chamber 28 and the 12 port of the fourth brake air chamber 30, the 11 port of the quick release valve 33 is connected with the 2 port of the first relay valve 6 through a twenty-first air passage 32, and the 3 port of the quick release valve 33 is an exhaust port.

In the above embodiment, it is preferable that the emergency relay valve 44 has the port 11 communicating with the port 12 thereof when the port 4 is not under control air pressure, and has the

ports

11 and 12 communicating with the port 2 thereof when under control air pressure; the higher pressure port of the 1 port and the 2 ports of the shuttle valve 49 is communicated with the 3 ports thereof; when the hand-operated reversing valve 24 is in a normal state, the port 1 is communicated with the port 2, and when the handle is pulled, the port 2 is communicated with the port 3; the pneumatic control reversing valve 38 has 1 port communicated with 5 ports and 2 ports communicated with 4 ports when 6 ports have no air pressure, and has 1 port communicated with 4 ports and 2 ports communicated with 3 ports when 6 ports have air pressure; when the power is off, the port 1 of the electromagnetic directional valve 35 is communicated with the port 5, the port 2 of the electromagnetic directional valve is communicated with the port 4, when the power is on, the port 1 of the electromagnetic directional valve is communicated with the port 4, and the port 2 of the electromagnetic directional valve is communicated with the port 3; one of the 11 ports and the 12 ports of the quick release valve 33 with higher pressure is communicated with the 2 ports thereof, and the 2 ports are communicated with the 3 ports when the 11 ports and the 12 ports are not aerated; the first relay valve 6, the second relay valve 10 and the third relay valve 19 are respectively communicated with the ports 2 and 3 when the ports 4 are not provided with air pressure, and the ports 1 and 2 when the ports 4 are provided with air pressure; the trailer is in a parking braking state when all 12 ports of the first brake air chamber 12, the second brake air chamber 14, the third brake air chamber 28 and the fourth brake air chamber 30 are empty, is in a brake releasing state when all 11 ports of the trailer are empty and all 12 ports of the trailer are empty, and is in a service braking state when all 11 ports and all 12 ports of the trailer are empty.

In the above embodiment, preferably, the trailer brake system is provided on a trailer, the power machine set is provided on the trailer, the trailer is in a self-walking mode when separated from the tractor, and the trailer is in a towing mode when towed by the tractor.

In the above embodiment, preferably, the tractor brake control line 47 is provided with the first quick-change connector 46, and the tractor air supply line 45 is provided with the second quick-change connector 48, so that the quick-change connector is used for realizing the quick-change connection state with the tractor.

In the above embodiment, preferably, in the self-travel mode, the tractor is disconnected from the trailer, the tractor air supply line 45 and the tractor brake control line 47 are disconnected, the emergency relay valve 44 is closed, the 6 ports of the pneumatic operated directional control valve 38 are not pressurized, and the power unit air supply line 2 supplies air to the air reservoir 3.

Specifically, in the self-walking mode:

in a normal driving state: the power unit gas source pipeline 2 supplies gas to the gas storage cylinder 3 all the time; the power unit brake control pipeline 1 has no air pressure; the manual reversing valve 24 is in a conventional state, and the port 1 and the port 2 of the manual reversing valve 24 are communicated; the electromagnetic directional valve 35 is electrified, and the port 1 and the port 4 of the electromagnetic directional valve 35 are communicated, and the port 2 and the port 3 of the electromagnetic directional valve 35 are communicated. At this time, since there is no air pressure at the 3 ports of the shuttle valve 49 and the 64 ports of the first relay valve, and the 62 ports of the first relay valve communicate with the 3 ports (exhaust ports), that is, there is no air pressure at the 4 ports of the second relay valve 10 and the third relay valve 19, the 2 ports of the second relay valve 10 and the third relay valve 19 also communicate with the 3 ports (exhaust ports), that is, there is no air pressure at the 11 ports of the first brake chamber 12, the second brake chamber 14, the third brake chamber 28, and the fourth brake chamber 30. Meanwhile, the air in the air storage cylinder 3 is communicated with the ports 12 of the first brake air chamber 12, the second brake air chamber 14, the third brake air chamber 28 and the fourth brake air chamber 30 through the ports 1 and 2 of the manual reversing valve 24, the ports 3 and 2 of the electromagnetic reversing valve 35 and the

ports

12 and 2 of the quick release valve 33. Therefore, the first brake chamber 12, the second brake chamber 14, the third brake chamber 28, and the fourth brake chamber 30 are in the parking release state.

When service braking is required: the power unit brake control pipeline 1 is ventilated, the port 1 and the port 3 of the shuttle valve 49 are communicated with the port 64 of the first relay valve, the port 61 and the port 2 of the first relay valve are communicated, the air in the air cylinder 3 is communicated with the port 4 of the second relay valve 10 and the port 4 of the third relay valve 19 through the port 4, the port 61 and the port 2 of the first relay valve 61, so that the port 1 and the port 2 of the second relay valve 10 and the port 2 of the third relay valve 19 are communicated, and the air in the air cylinder 3 is communicated with the port 11 of the first brake air chamber 12, the second brake air chamber 14, the third brake air chamber 28 and the fourth brake air chamber 30 through the port 4, the port 1 and the port 2 of the second relay valve 10 and the port 1 and the port 2 of the third relay valve 19, so that the first brake air chamber 12, the second brake air chamber 14, the third brake air chamber 28 and the fourth brake air chamber 30 are in a running state.

When parking braking is required; the power unit brake control circuit 1 stops ventilation, the port of the first relay valve 64 is empty of air pressure, the port 62 of the first relay valve is communicated with the port 3, and air between the port 62 of the first relay valve and the port 11 of the quick release valve 33 is exhausted through the port 62 of the first relay valve and the port 3 (exhaust port). Meanwhile, the electromagnetic directional valve 35 is not powered, that is, the port 1 of the electromagnetic valve is communicated with the port 5, and the port 2 of the electromagnetic directional valve 35 is communicated with the port 4, and the air between the port 2 of the electromagnetic directional valve 35 and the port 12 of the quick release valve 33 is exhausted through the ports 2 and 4 of the electromagnetic valve and the ports 1 and 5 (exhaust ports) of the pneumatic directional valve 38. At this time, no air is present in both

ports

11 and 12 of the quick release valve 33, ports 2 and 3 (exhaust ports) of the quick release valve 33 are connected, and air in the ports 12 of the first brake chamber 12, the second brake chamber 14, the third brake chamber 28, and the fourth brake chamber 30 is exhausted through ports 2 and 3 of the quick release valve 33, so that the first brake chamber 12, the second brake chamber 14, the third brake chamber 28, and the fourth brake chamber 30 are in the parking brake state at this time.

In the above embodiment, preferably, in the traction mode, the power unit is turned off, the power unit air source pipeline 2 and the power unit brake control pipeline 1 are closed, the electromagnetic directional valve 35 is in communication with the ports 1 and 5 and the ports 2 and 4 when not powered, the tractor air source pipeline 45 supplies air to the air cylinder 3 through the

ports

11 and 12 of the emergency relay valve 44, meanwhile, the tractor air source pipeline 45 is in communication with the port 6 of the pneumatic directional valve 38, and the port 1 and the port 4 and the port 2 and the port 3 of the pneumatic directional valve 38 are in communication.

In the self-walking mode state, the tractor brake control pipeline 47 and the tractor air source pipeline 45 are connected with corresponding pipelines of the tractor through quick change connectors, namely the tractor brake control pipeline 47 and the tractor air source pipeline 45 are ventilated, at the moment, the emergency relay valve 44 and the corresponding port in the pneumatic control reversing valve 38 are subjected to air pressure, and the state is automatically switched to the traction mode.

Specifically, in the traction mode:

in a normal driving state: the tractor air source pipeline 45 supplies air to the air storage cylinder 3 through the 11 ports and the 12 ports of the emergency relay valve 44, the tractor brake control pipeline 47 is free of air, the manual reversing valve 24 is in a conventional state, and the 1 port and the 2 ports of the manual reversing valve 24 are communicated. At this time, since there is no air pressure at the 3 ports of the shuttle valve 49 and the 64 ports of the first relay valve, and the 62 ports of the first relay valve communicate with the 3 ports (exhaust ports), that is, there is no air pressure at the 4 ports of the second relay valve 10 and the third relay valve 19, the 2 ports of the second relay valve 10 and the third relay valve 19 also communicate with the 3 ports (exhaust ports), that is, there is no air pressure at the 11 ports of the first brake chamber 12, the second brake chamber 14, the third brake chamber 28, and the fourth brake chamber 30. Meanwhile, the air in the air storage cylinder 3 is communicated to the ports 12 of the first brake air chamber 12, the second brake air chamber 14, the third brake air chamber 28 and the fourth brake air chamber 30 from the ports 3 through the ports 1 and 2 of the manual reversing valve 24, the ports 4 and 1 of the pneumatic reversing valve 38, the ports 4 and 2 of the electromagnetic reversing valve 35 and the

ports

When service braking is required: the tractor brake control line 47 is vented to 4 ports of the

emergency relay valve

44, 2 ports of the emergency relay valve 44 are communicated with 11 ports and 12 ports, the air in the air cylinder 3 is communicated with the first relay valve 64 port through 2 ports and 3 ports of the shuttle valve 49, the first relay valve 61 port and 2 ports are communicated, the air in the air cylinder 3 is communicated with 4 ports of the second relay valve 10 and the third relay valve 19 through 4 ports, the first relay valve 61 port and 2 ports, the second relay valve 10 and the third relay valve 19 are communicated with 1 port and 2 ports, the air in the air cylinder 3 is communicated with 11 ports of the first brake air chamber 12, the second brake air chamber 14, the third brake air chamber 28 and the fourth brake air chamber 30 through 4 ports, the 1 port and 2 ports of the second relay valve 10 and the third relay valve 19, therefore, the first brake chamber 12, the second brake chamber 14, the third brake chamber 28, and the fourth brake chamber 30 are in the service braking state at this time.

When parking braking is required; the tractor brake control line stops ventilation, port 2 of the emergency relay valve 44 is disconnected from

ports

11 and 12, port 64 of the first relay valve is empty of air pressure, ports 62 and 3 of the first relay valve are communicated, and air between port 62 of the first relay valve and port 11 of the quick release valve 33 is exhausted through ports 62 and 3 (exhaust ports) of the first relay valve. At this time, the handle of the manual directional valve 24 is pulled, the ports 2 and 3 (exhaust ports) of the manual directional valve 24 are communicated, and the air between the port 2 of the electromagnetic directional valve 35 and the port 12 of the quick release valve 33 is exhausted through the ports 2 and 4 of the electromagnetic valve, the ports 1 and 4 of the pneumatic directional valve 38 and the ports 2 and 3 (exhaust ports) of the manual directional valve 24. At this time, no air is present in both

ports

According to the dual-mode automatic switching trailer brake system provided by the invention, after the quick-change connector is connected with the control pipeline and the air source pipeline of the tractor, the emergency relay valve and the air-controlled reversing valve are communicated, at the moment, air in the air storage cylinder is communicated into the brake air chamber through the manual reversing valve, the air-controlled reversing valve, the electromagnetic reversing valve and the quick release valve, so that the parking brake state of the trailer is released, and the automatic switching from the self-walking mode to the traction mode is realized.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual mode auto-switching trailer brake system, comprising: the air storage cylinder, the emergency relay valve, the shuttle valve, the pneumatic control reversing valve, the electromagnetic reversing valve, the manual reversing valve, the quick release valve, the brake air chamber and the relay valve, wherein the relay valve comprises a first relay valve, a second relay valve and a third relay valve;

the air storage cylinder is connected with an air source pipeline of the power unit, the shuttle valve is connected with a braking control pipeline of the power unit, and the emergency relay valve is connected with a braking control pipeline of the tractor and the air source pipeline of the tractor;

the air storage cylinder is further connected with the emergency relay valve, the manual reversing valve and the relay valve respectively, the shuttle valve is connected with the emergency relay valve and the first relay valve respectively, the manual reversing valve is further connected with the pneumatic control reversing valve and the electromagnetic reversing valve respectively, the pneumatic control reversing valve is further connected with the tractor air source pipeline and the electromagnetic reversing valve, the electromagnetic reversing valve is further connected with the quick release valve, and the quick release valve is further connected with the brake air chamber and the relay valve respectively;

the 1 port of the air storage cylinder is connected with an air source pipeline of the power unit, the 2 port of the air storage cylinder is connected with the 12 port of the emergency relay valve, the 3 port of the air storage cylinder is connected with the 1 port of the manual reversing valve, and the 4 ports of the air storage cylinder are respectively connected with the 1 port of the first relay valve, the 1 port of the second relay valve and the 1 port of the third relay valve;

a port 1 of the shuttle valve is connected with a brake control pipeline of the power unit, a port 2 of the shuttle valve is connected with a port 2 of the emergency relay valve, a port 3 of the shuttle valve is connected with a port 4 of the first relay valve, a port 11 of the emergency relay valve is connected with an air source pipeline of the tractor, and a port 4 of the emergency relay valve is connected with a brake control pipeline of the tractor;

a port 1 of the pneumatic control reversing valve is connected with a port 4 of the electromagnetic reversing valve, a port 6 of the pneumatic control reversing valve is connected with an air source pipeline of the tractor, ports 2 and 3 of the pneumatic control reversing valve are plugged, and a port 5 of the pneumatic control reversing valve is an exhaust port;

2 ports of the manual reversing valve are respectively connected with 4 ports of the pneumatic control reversing valve and 3 ports of the electromagnetic reversing valve, and 3 ports of the manual reversing valve are exhaust ports;

the 11 ports of the emergency relay valve are connected with the air source pipeline of the tractor, and the 4 ports of the emergency relay valve are connected with the brake control pipeline of the tractor;

2 ports of the electromagnetic directional valve are connected with 12 ports of the quick release valve, 1 port is blocked, and 5 ports are exhaust ports;

the brake air chambers comprise a first brake air chamber, a second brake air chamber, a third brake air chamber and a fourth brake air chamber, the 2 ports of the first relay valve are respectively connected with the 4 ports of the second relay valve and the 4 ports of the third relay valve, the 3 ports of the first relay valve, the second relay valve and the third relay valve are exhaust ports, the 2 port of the second relay valve is respectively connected with the 11 port of the first brake air chamber and the 11 port of the fourth brake air chamber, the port 2 of the third relay valve is respectively connected with the port 11 of the second brake air chamber and the port 11 of the third brake air chamber, 2 ports of the quick release valve are respectively connected with 12 ports of the first brake chamber, 12 ports of the second brake chamber, 12 ports of the third brake chamber and 12 ports of the fourth brake chamber, and 3 ports of the quick release valve are exhaust ports;

when the 4 ports of the emergency relay valve do not control air pressure, the 11 ports are communicated with the 12 ports of the emergency relay valve, and when the 4 ports of the emergency relay valve control air pressure, the 11 ports and the 12 ports are communicated with the 2 ports of the emergency relay valve;

one port with higher pressure in the ports 1 and 2 of the shuttle valve is communicated with the port 3 of the shuttle valve;

when the hand-operated reversing valve is in a normal state, the port 1 is communicated with the port 2, and when the handle is pulled, the port 2 is communicated with the port 3;

when the 6 ports have no air pressure, the 1 port of the pneumatic control reversing valve is communicated with the 5 ports, the 2 port of the pneumatic control reversing valve is communicated with the 4 ports, when the 6 ports have air pressure, the 1 port of the pneumatic control reversing valve is communicated with the 4 ports, and the 2 port of the pneumatic control reversing valve is communicated with the 3 ports;

when the electromagnetic directional valve is not electrified, the port 1 is communicated with the port 5, the port 2 is communicated with the port 4, when the electromagnetic directional valve is electrified, the port 1 is communicated with the port 4, and the port 2 is communicated with the port 3;

one of the 11 ports and the 12 ports of the quick release valve with higher pressure is communicated with the 2 ports thereof, and the 2 ports are communicated with the 3 ports when the 11 ports and the 12 ports are not aerated;

the first relay valve, the second relay valve and the third relay valve are all provided with 2 ports communicated with 3 ports when 4 ports of the first relay valve, the second relay valve and the third relay valve are not provided with air pressure, and 1 port of the first relay valve, the second relay valve and the third relay valve is communicated with 2 ports when 4 ports of the first relay valve, the second relay valve and the third relay valve are provided with air pressure;

the trailer is in a parking braking state when 12 ports of the first brake air chamber, the second brake air chamber, the third brake air chamber and the fourth brake air chamber are all air-free, is in a brake releasing state when 11 ports of the trailer are all air-free and 12 ports of the trailer are all air-free, and is in a service braking state when 11 ports and 12 ports of the trailer are all air-free.

2. The dual mode auto-switching trailer brake system as recited in claim 1, wherein:

the trailer braking system is arranged on a trailer, the power machine group is arranged on the trailer, the trailer is in a self-walking mode when being separated from the tractor, and the trailer is in a traction mode when being pulled by the tractor.

3. The dual mode auto-switching trailer brake system as recited in claim 2, wherein:

under from the walking mode, the tractor with the trailer separation, tractor air supply pipeline with the disconnection of tractor braking control pipeline, urgent relay valve closes, 6 mouthfuls of no atmospheric pressure of gas accuse switching-over valve, power unit air supply pipeline is to the gas receiver air feed.

4. The dual mode auto-switching trailer brake system as recited in claim 2, wherein:

under the traction mode, the power unit closes, power unit air supply pipeline with power unit brake control pipeline is closed, 1 mouthful and 5 mouthful intercommunications, 2 mouthful and 4 mouthful intercommunications of solenoid directional valve when not having the electricity, tractor air supply pipeline passes through 11 mouthful and 12 mouthful of urgent relay valve to the gas receiver air feed, simultaneously tractor air supply pipeline intercommunication 6 mouths of gas accuse switching-over valve, 1 mouth and 4 mouthful intercommunications, 2 mouths and 3 mouths intercommunications of gas accuse switching-over valve.

5. A dual mode auto-switching trailer brake system as claimed in claim 1 wherein a first quick-change connector is provided on said tractor brake control line and a second quick-change connector is provided on said tractor air supply line.