CN214304617U

CN214304617U - Bypass load sensing multi-way reversing valve hydraulic system

Info

Publication number: CN214304617U
Application number: CN202120292459.9U
Authority: CN
Inventors: 申忠玉
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-09-28
Anticipated expiration: 2031-02-02

Abstract

A hydraulic system of a bypass load sensing multi-way reversing valve comprises a multi-way reversing valve, a bypass oil way, a pressure compensation valve and the like. When each multi-way reversing valve does not work, the oil is returned by the bypass oil way to realize the low-pressure standby work of the system. When the multi-way reversing valve works, oil return of the bypass oil way is gradually cut off, and the multi-way reversing valve works, so that low-pressure oil return through the bypass oil way is realized when the multi-way reversing valve hydraulic system does not work, and oil is supplied to the multi-way reversing valve according to load induction pressure in a proportionally shunting manner during working.

Description

Bypass load sensing multi-way reversing valve hydraulic system

Technical Field

The invention relates to a load sensing multi-way reversing valve hydraulic system, in particular to a bypass load sensing multi-way reversing valve hydraulic system.

Background

At present, a load sensing multi-way reversing valve hydraulic system for engineering machinery such as excavators and loaders and agricultural and forestry machinery in the market has high standby pressure and consumes energy. Therefore, the market urgently needs a bypass load sensing multi-way reversing valve hydraulic system: when each multi-way reversing valve unit does not work, the bypass oil way oil return realizes low-pressure standby work of the system, when the multi-way reversing valve unit works, the bypass oil way oil return is gradually cut off, and the multi-way reversing valve works, so that low-pressure oil return through the bypass oil way is realized when the multi-way reversing valve hydraulic system does not work, and oil is supplied to the multi-way reversing valve unit in a manner of proportionally shunting according to load induction pressure during work.

Disclosure of Invention

The invention aims to realize low-pressure standby operation of a system by the oil return of a bypass oil way when each multi-way reversing valve of a bypass load induction multi-way reversing valve hydraulic system for engineering machinery such as excavators, loaders and the like and agricultural machinery does not work, and ensure that the oil return of the bypass oil way is gradually cut off when the multi-way reversing valve works, so that the multi-way reversing valve works, low-pressure oil return through the bypass oil way when the multi-way reversing valve hydraulic system does not work is realized, and the oil is proportionally supplied to the multi-way reversing valve according to load induction pressure during working.

A bypass load sensing multi-way reversing valve hydraulic system is characterized in that: the pressure and flow control of the bypass load sensing multi-way reversing valve hydraulic system is completed by a bypass loop and a load sensing pressure compensation valve loop, and comprises a multi-way reversing valve I1, a multi-way reversing valve II 2, a multi-way reversing valve I3, a multi-way reversing valve II 4, a pressure compensation valve I5, a pressure compensation valve II 6, a multi-way reversing valve I oil inlet channel 7, a multi-way reversing valve II oil inlet channel 8, a multi-way reversing valve I pressure compensation oil inlet channel 9, a multi-way reversing valve II pressure compensation oil inlet channel 10, a multi-way reversing valve II oil return channel 11, a multi-way reversing valve II oil return channel 12, a multi-way reversing valve II bypass oil outlet channel 13, a multi-way reversing valve II bypass oil outlet channel 14, a pressure compensation valve I oil inlet channel 15, a pressure compensation valve II oil inlet channel 16, a pressure compensation valve I oil outlet channel 17 and a pressure compensation valve II oil outlet channel 18, a first load sensing oil outlet 19 of the pressure compensating valve, a second load sensing oil outlet 20 of the pressure compensating valve, a multi-way directional control valve connected with a bypass oil inlet channel 21, a multi-way directional control valve connected with a second bypass oil inlet channel 22, a bypass valve 23, a bypass valve oil inlet 24, a bypass valve oil outlet 25, a bypass valve spring 26, a bypass valve control force 27, an oil inlet pressure compensating valve 28, an oil inlet pressure compensating valve spring 29, an oil inlet pressure compensating valve oil inlet 30, an oil inlet pressure compensating valve oil outlet 31, an oil inlet pressure compensating valve control oil port 32, a main oil inlet 33, a load sensing oil port 34, a main oil return port 35, a first load oil port 36 of the multi-way directional control valve connected with a first load oil port, a second load oil port 37 of the multi-way directional control valve connected with a first load oil port 38, a second load oil port 39 of the multi-way directional control valve connected with a second load oil port, a first multi-way directional control valve connected with a first 1 and a second load oil port 2 in parallel, a first valve connected with a first valve spool 3 and a pressure compensating valve 5 on a first multi-way directional control valve connected with a first load oil port 37, the multi-way reversing valve is connected with a two-valve core 4 and a pressure compensating valve 6 on a multi-way reversing valve connection 2, the multi-way reversing valve is connected with an oil inlet channel 7 and a multi-way reversing valve is connected with an oil inlet channel 8 and a main oil inlet 33, the multi-way reversing valve is connected with a pressure compensating oil inlet channel 9 and a pressure compensating valve oil outlet channel 17, the multi-way reversing valve is connected with a pressure compensating oil inlet channel 10 and a pressure compensating valve oil outlet channel 18, the multi-way reversing valve is connected with a return oil channel 11 and a multi-way reversing valve oil return channel 12 and a main oil return port 35, the multi-way reversing valve is connected with a bypass oil outlet channel 13 and a main oil return port 35, the multi-way reversing valve is connected with a bypass oil outlet channel 14 and a bypass oil inlet channel 21, the multi-way reversing valve is connected with a bypass oil inlet channel 22 and a main oil inlet 33, the pressure compensating valve is connected with a load sensing oil outlet 19 and the pressure compensating valve two load sensing oil outlet 20 and a load sensing oil port 34, a bypass valve oil inlet 24 is communicated with a main oil inlet 33, a bypass valve oil outlet 25 is communicated with a main oil return port 35, a bypass valve spring 26 is arranged at the right side of the bypass valve 23, a bypass valve control force 27 acts at the left side of the bypass valve 23, an oil inlet pressure compensation valve spring 29 is arranged at the right side of the oil inlet pressure compensation valve 28, an oil inlet pressure compensation valve oil inlet 30 is communicated with the main oil inlet 33, an oil inlet pressure compensation valve oil outlet 31 is communicated with the main oil return port 35, an oil inlet pressure compensation valve control oil port 32 is communicated with a load sensing oil port 34, a multi-way reversing valve with a load oil port I36 and a multi-way reversing valve with a load oil port II 37 is arranged on a multi-way reversing valve joint I1, a multi-way reversing valve with a load oil port I38 and a multi-way reversing valve with a load oil port II 39 are arranged on a multi-way reversing valve joint II 2, when the main oil inlet 33 is connected with each multi-way reversing valve, hydraulic oil flows through the multi-way reversing valve with the bypass oil inlet 22, the multi-way reversing valve with the multi-way valve with a valve joint II valve spool 4 and the multi-way reversing valve joint II bypass outlet The oil duct 14 and the multi-way reversing valve are connected with a bypass oil inlet duct 21 and a multi-way reversing valve is connected with a valve core 3 and a multi-way reversing valve is connected with a bypass oil outlet duct 13 and a main oil return port 35 to return oil, under the action of a bypass valve spring 26, a bypass valve oil inlet 24 is communicated with a bypass valve oil outlet 25 through a bypass valve 23 and then communicated with the main oil return port 35 to return oil, low-pressure standby work of the system is realized, when oil enters a main oil inlet 33 and the multi-way reversing valve 1 works, the multi-way reversing valve is connected with the valve core 3 to move so as to gradually cut off a passage of the multi-way reversing valve connected with the bypass oil outlet duct 13 and the multi-way reversing valve connected with the bypass oil inlet duct 21, meanwhile, a bypass valve control force 27 is applied to the left side of the bypass valve 23 to overcome the force of the bypass valve spring 26 to enable the valve core of the bypass valve 23 to move rightwards to gradually close an oil return passage of the bypass valve oil inlet 24, and further gradually cut off a passage of the main oil inlet 33 and the main oil return port 35, hydraulic oil is fed into a pressure compensation valve first oil inlet channel 15 through a multi-way reversing valve first oil inlet channel 7, a pressure compensation valve first 5 starts to work, pressure oil is output to a multi-way reversing valve first oil outlet channel 17 and a pressure compensation oil inlet channel 9 through a multi-way reversing valve first valve core 3 and then is fed to a multi-way reversing valve first 1 load oil port through a multi-way reversing valve first load sensing oil outlet 19, a pressure compensation valve second load sensing oil outlet 20, an oil inlet pressure compensation valve control oil port 32 and a load sensing oil port 34 all have oil pressure, the pressure of the pressure compensation valve first oil outlet channel 17 and the pressure compensation valve first load sensing oil outlet 19 is determined by the load size of the multi-way reversing valve first 1 load oil port, meanwhile, the pressure of the pressure compensation valve first load sensing oil outlet 19 acts on the lower ends of the pressure compensation valve first 5 oil inlet and the pressure compensation valve second 6, and the pressure of the oil inlet pressure compensation valve inlet 30 and the oil inlet pressure compensation valve control 32 are used for oil pressure and pressure compensation The oil inlet pressure compensation valve 28 starts to work under the combined action of the force of the valve spring 29, the working principle of the multi-way reversing valve unit I2 is the same as that of the multi-way reversing valve unit I1, when the multi-way reversing valve unit I1 and the multi-way reversing valve unit II 2 work simultaneously, the pressure of the load sensing oil port 34 is the maximum load sensing pressure and acts on the lower ends of the two pressure compensation valves, the multi-way reversing valve unit is supplied with oil in a proportionally split manner, low-pressure oil return through a bypass oil path is achieved when the multi-way reversing valve hydraulic system does not work, and oil is supplied to the multi-way reversing valve unit in a proportionally split manner according to the load sensing pressure during work.

Description of the drawings:

the invention is described in further detail below with reference to the following figures and embodiments:

fig. 1 is a schematic structural diagram of a bypass load sensing multiple directional control valve hydraulic system.

FIG. 2 is a schematic structural diagram of a bypass oil path only comprising a multi-way reversing valve and a bypass oil path.

Fig. 3 is a schematic structural diagram of a bypass oil path only with a bypass valve.

Detailed Description

Example one FIG. 1

The bypass load sensing multi-way reversing valve hydraulic system is characterized in that: the pressure and flow control of the bypass load sensing multi-way reversing valve hydraulic system is completed by a bypass loop and a load sensing pressure compensation valve loop, and comprises a multi-way reversing valve I1, a multi-way reversing valve II 2, a multi-way reversing valve I3, a multi-way reversing valve II 4, a pressure compensation valve I5, a pressure compensation valve II 6, a multi-way reversing valve I oil inlet channel 7, a multi-way reversing valve II oil inlet channel 8, a multi-way reversing valve I pressure compensation oil inlet channel 9, a multi-way reversing valve II pressure compensation oil inlet channel 10, a multi-way reversing valve II oil return channel 11, a multi-way reversing valve II oil return channel 12, a multi-way reversing valve II bypass oil outlet channel 13, a multi-way reversing valve II bypass oil outlet channel 14, a pressure compensation valve I oil inlet channel 15, a pressure compensation valve II oil inlet channel 16, a pressure compensation valve I oil outlet channel 17 and a pressure compensation valve II oil outlet channel 18, the hydraulic control system comprises a first pressure compensation valve load sensing oil outlet 19, a second pressure compensation valve load sensing oil outlet 20, a multi-way reversing valve connected with a bypass oil inlet channel 21, a second multi-way reversing valve connected with a bypass oil inlet channel 22, a bypass valve 23, a bypass valve oil inlet 24, a bypass valve oil outlet 25, a bypass valve spring 26, a bypass valve control force 27, an oil inlet pressure compensation valve 28, an oil inlet pressure compensation valve spring 29, an oil inlet pressure compensation valve oil inlet 30, an oil inlet pressure compensation valve oil outlet 31, an oil inlet pressure compensation valve control oil port 32, a main oil inlet 33, a load sensing oil port 34, a main oil return port 35, a first multi-way reversing valve connected with a first load oil port 36, a second multi-way reversing valve connected with a second load oil port 37, a first multi-way reversing valve connected with a second load oil port 38 and a second multi-way reversing valve connected with a second load oil port 39.

Wherein, the multi-way reversing valve is connected with a first 1 and a second 2 in parallel, the multi-way reversing valve is connected with a first valve core 3 and a first pressure compensation valve 5 on the first 1, the multi-way reversing valve is connected with a second valve core 4 and a second pressure compensation valve 6 on the second 2, the multi-way reversing valve is connected with a first oil inlet channel 7 and a second oil inlet channel 8 in communication with a main oil inlet 33, the multi-way reversing valve is connected with a first pressure compensation oil inlet channel 9 in communication with a first oil outlet channel 17 of the pressure compensation valve, the multi-way reversing valve is connected with a second pressure compensation oil inlet channel 10 in communication with a second oil outlet channel 18 of the pressure compensation valve, the multi-way reversing valve is connected with a first oil return channel 11 and a second oil return channel 12 in communication with a main oil return port 35, the multi-way reversing valve is connected with a first bypass oil outlet channel 13 in communication with a main oil return port 35, the multi-way reversing valve is connected with a second bypass oil outlet channel 14 in communication with a first bypass oil inlet channel 21, the multi-way reversing valve is connected with a second oil inlet channel 22 in communication with a bypass oil inlet channel 33, a first load sensing oil outlet 19 of the pressure compensating valve and a second load sensing oil outlet 20 of the pressure compensating valve are communicated with a load sensing oil port 34, a bypass valve oil inlet 24 is communicated with a main oil inlet 33, a bypass valve oil outlet 25 is communicated with a main oil return port 35, a bypass valve spring 26 is arranged at the right side of the bypass valve 23, a bypass valve control force 27 acts at the left side of the bypass valve 23, an inlet pressure compensating valve spring 29 is arranged at the right side of the inlet pressure compensating valve 28, an inlet pressure compensating valve oil inlet 30 is communicated with the main oil inlet 33, an inlet pressure compensating valve oil outlet 31 is communicated with the main oil return port 35, an inlet pressure compensating valve control oil port 32 is communicated with the load sensing oil port 34, a multi-way reversing valve with a first load oil port 36 and a multi-way reversing valve with a second load oil port 37 on a first multi-way reversing valve 1, a multi-way reversing valve with a second load oil port 38 and a multi-way reversing valve with a second load oil port 39 on a second multi-way reversing valve 2, when the main oil inlet 33 is filled with oil and each multi-way directional valve linkage does not work, hydraulic oil is communicated with a bypass oil outlet channel 13 and a main oil return port 35 through a multi-way directional valve linkage two-bypass oil inlet channel 22, a multi-way directional valve linkage two-spool 4, a multi-way directional valve linkage two-bypass oil outlet channel 14, a multi-way directional valve linkage one-bypass oil inlet channel 21, a multi-way directional valve linkage one-spool 3, a multi-way directional valve linkage one-bypass oil outlet channel 13 and a main oil return port 35 for returning oil, under the action of a bypass valve spring 26, a bypass valve oil inlet 24 is communicated with a bypass valve oil outlet 25 through a bypass valve 23 and is communicated with a main oil return port 35 for returning oil, low-pressure standby operation of the system is realized, when the main oil inlet 33 is filled with oil and the multi-way directional valve linkage one 1 for operation, the multi-way directional valve linkage one-spool 3 moves to enable a bypass valve linkage one-bypass oil outlet channel 13 and a bypass valve linkage one-bypass oil inlet channel 21 of the multi-way directional valve linkage to be gradually cut off the bypass valve, and simultaneously, a left side control force 27 acts on the left side of the main oil inlet channel 23 to overcome the force of the spring 26 to gradually to close a bypass valve 23 The oil return passage of the oil inlet 24 gradually cuts off the passage between the main oil inlet 33 and the main oil return port 35, the hydraulic oil is fed into the first pressure compensation valve oil inlet 15 through the first multiple directional control valve and the first pressure compensation valve oil inlet 7, the first pressure compensation valve 5 starts to work, the first pressure compensation valve oil outlet 17 outputs pressure oil to the first multiple directional control valve and the first pressure compensation valve oil inlet 9 through the first multiple directional control valve and the first valve core 3 and then feeds the oil to the first load port 1 of the first multiple directional control valve, the first pressure compensation valve load sensing oil outlet 19, the second pressure compensation valve load sensing oil outlet 20, the oil inlet pressure compensation valve control oil port 32 and the load sensing oil port 34 both have oil pressure, the pressure of the first pressure compensation valve oil outlet 17 and the first pressure compensation valve load sensing oil outlet 19 is determined by the load size of the first load of the first multiple directional control valve, and the pressure of the first pressure compensation valve load sensing oil outlet 19 acts on the lower ends of the first pressure compensation valve 5 and the second pressure compensation valve 6, the oil inlet pressure compensation valve 28 starts to work under the combined action of the pressure of oil from the oil inlet 30 of the oil inlet pressure compensation valve and the oil inlet pressure compensation valve control oil port 32 and the force of the oil inlet pressure compensation valve spring 29, the working principle of the multi-way directional valve unit I2 is the same as that of the multi-way directional valve unit I1, when the multi-way directional valve unit I1 and the multi-way directional valve unit I2 work simultaneously, the pressure of the load sensing oil port 34 is the maximum load sensing pressure and acts on the lower ends of the two pressure compensation valves, the multi-way directional valve unit is supplied with oil in a proportional split manner, therefore, low-pressure oil return through a bypass oil path is realized when the multi-way directional valve hydraulic system does not work, and the multi-way directional valve unit is supplied with oil in a proportional split manner according to the load sensing pressure during work.

Example II FIG. 2

The bypass load sensing multi-way reversing valve hydraulic system is characterized in that: the pressure and flow control of the bypass load sensing multi-way reversing valve hydraulic system is completed by a bypass loop and a load sensing pressure compensation valve loop, and comprises a multi-way reversing valve I1, a multi-way reversing valve II 2, a multi-way reversing valve I3, a multi-way reversing valve II 4, a pressure compensation valve I5, a pressure compensation valve II 6, a multi-way reversing valve I oil inlet channel 7, a multi-way reversing valve II oil inlet channel 8, a multi-way reversing valve I pressure compensation oil inlet channel 9, a multi-way reversing valve II pressure compensation oil inlet channel 10, a multi-way reversing valve II oil return channel 11, a multi-way reversing valve II oil return channel 12, a multi-way reversing valve II bypass oil outlet channel 13, a multi-way reversing valve II bypass oil outlet channel 14, a pressure compensation valve I oil inlet channel 15, a pressure compensation valve II oil inlet channel 16, a pressure compensation valve I oil outlet channel 17 and a pressure compensation valve II oil outlet channel 18, the first pressure compensation valve load sensing oil outlet 19, the second pressure compensation valve load sensing oil outlet 20, the multi-way reversing valve connected with a bypass oil inlet duct 21, the multi-way reversing valve connected with a second bypass oil inlet duct 22, the oil inlet pressure compensation valve 28, the oil inlet pressure compensation valve spring 29, the oil inlet pressure compensation valve oil inlet 30, the oil inlet pressure compensation valve oil outlet 31, the oil inlet pressure compensation valve control oil port 32, the main oil inlet 33, the load sensing oil port 34, the main oil return port 35, the multi-way reversing valve connected with a first load oil port 36, the multi-way reversing valve connected with a second load oil port 37, the multi-way reversing valve connected with a second load oil port 38, and the multi-way reversing valve connected with a second load oil port 39.

Wherein, the multi-way reversing valve is connected with a first 1 and a second 2 in parallel, the multi-way reversing valve is connected with a first valve core 3 and a first pressure compensation valve 5 on the first 1, the multi-way reversing valve is connected with a second valve core 4 and a second pressure compensation valve 6 on the second 2, the multi-way reversing valve is connected with a first oil inlet channel 7 and a second oil inlet channel 8 in communication with a main oil inlet 33, the multi-way reversing valve is connected with a first pressure compensation oil inlet channel 9 in communication with a first oil outlet channel 17 of the pressure compensation valve, the multi-way reversing valve is connected with a second pressure compensation oil inlet channel 10 in communication with a second oil outlet channel 18 of the pressure compensation valve, the multi-way reversing valve is connected with a first oil return channel 11 and a second oil return channel 12 in communication with a main oil return port 35, the multi-way reversing valve is connected with a first bypass oil outlet channel 13 in communication with a main oil return port 35, the multi-way reversing valve is connected with a second bypass oil outlet channel 14 in communication with a first bypass oil inlet channel 21, the multi-way reversing valve is connected with a second oil inlet channel 22 in communication with a bypass oil inlet channel 33, the first load sensing oil outlet 19 and the second load sensing oil outlet 20 of the pressure compensation valve are communicated with the load sensing oil port 34, the spring 29 of the oil inlet pressure compensation valve is arranged on the right side of the oil inlet pressure compensation valve 28, the oil inlet 30 of the oil inlet pressure compensation valve is communicated with the main oil inlet 33, the oil outlet 31 of the oil inlet pressure compensation valve is communicated with the main oil return port 35, the oil inlet pressure compensation valve control oil port 32 is communicated with the load sensing oil port 34, the multi-way reversing valve is connected with the first load oil port 36 and the multi-way reversing valve connected with the first load oil port 37 on the first multi-way reversing valve link 1, the multi-way reversing valve is connected with the second load oil port 38 and the multi-way reversing valve connected with the second load oil port 39 on the second multi-way reversing valve link 2, when the main oil inlet 33 is in an idle state, hydraulic oil passes through the second bypass oil inlet channel 22 of the multi-way reversing valve and the second load oil port link 14 and the multi-way reversing valve linked with the second valve bypass oil outlet 14 and the first bypass oil channel 21 and the multi-way reversing valve linked with the first bypass oil channel When the valve core 3 and the multi-way reversing valve are connected with one bypass oil outlet channel 13 and the main oil return port 35 to return oil, low-pressure standby work of the system is realized, when an oil inlet 33 of a main oil inlet and a multi-way reversing valve 1 are connected to work, the multi-way reversing valve and the valve core 3 move to gradually cut off a passage of the multi-way reversing valve and one bypass oil inlet channel 21, the main oil inlet 33 and the main oil return port 35 are cut off, hydraulic oil enters the pressure compensation valve first oil inlet channel 15 through the multi-way reversing valve and one oil inlet channel 7, the pressure compensation valve first 5 starts to work, pressure oil is output to the multi-way reversing valve and one pressure compensation oil inlet channel 9, the oil inlet and one pressure compensation valve are connected with one valve core 3, then the multi-way reversing valve and one oil port 1 load is supplied to the pressure compensation valve, and simultaneously the oil outlet 19, the pressure compensation valve second load sensing oil outlet 20, the pressure compensation valve 32 and the load sensing oil port 34 are provided with the oil outlet 19 and the pressure compensation valve first load sensing oil port 34 The pressure of the first oil outlet channel 17 of the pressure compensation valve and the first load sensing oil outlet 19 of the pressure compensation valve is determined by the load size of the first load oil port of the first multi-way reversing valve 1, meanwhile, the pressure of the first load sensing oil outlet 19 of the pressure compensation valve acts on the lower ends of the first pressure compensation valve 5 and the second pressure compensation valve 6, the oil inlet pressure compensation valve 28 starts to work under the combined action of the oil pressure of the oil inlet 30 of the oil inlet pressure compensation valve and the oil inlet pressure control oil port 32 of the oil inlet pressure compensation valve and the force of the spring 29 of the oil inlet pressure compensation valve, the working principle of the second multi-way reversing valve 2 is the same as that of the first multi-way reversing valve 1, when the first multi-way reversing valve 1 and the second multi-way reversing valve 2 work simultaneously, the pressure of the load sensing oil port 34 is the maximum load sensing pressure and acts on the lower ends of the two pressure compensation valves, and the oil supply for the first multi-way reversing valve in a proportional diversion manner is realized, therefore, low-pressure oil return through the bypass oil way is realized when the multi-way reversing valve hydraulic system does not work, and oil is supplied to the multi-way reversing valve in a proportionally shunting manner according to load induction pressure during work.

Example III FIG. 3

The bypass load sensing multi-way reversing valve hydraulic system is characterized in that: the pressure and flow control of the bypass load sensing multi-way reversing valve hydraulic system is completed by a bypass loop and a load sensing pressure compensation valve loop together, and comprises a multi-way reversing valve I1, a multi-way reversing valve II 2, a multi-way reversing valve I3, a multi-way reversing valve II 4, a pressure compensation valve I5, a pressure compensation valve II 6, a multi-way reversing valve I oil inlet channel 7, a multi-way reversing valve II oil inlet channel 8, a multi-way reversing valve I pressure compensation oil inlet channel 9, a multi-way reversing valve II pressure compensation oil inlet channel 10, a multi-way reversing valve II oil return channel 11, a multi-way reversing valve II oil return channel 12, a pressure compensation valve I oil inlet channel 15, a pressure compensation valve II oil inlet channel 16, a pressure compensation valve I oil outlet channel 17, a pressure compensation valve II oil outlet channel 18, a pressure compensation valve I load sensing oil outlet 19 and a pressure compensation valve II load sensing oil outlet 20, the hydraulic control system comprises a bypass valve 23, a bypass valve oil inlet 24, a bypass valve oil outlet 25, a bypass valve spring 26, a bypass valve control force 27, an oil inlet pressure compensation valve 28, an oil inlet pressure compensation valve spring 29, an oil inlet pressure compensation valve oil inlet 30, an oil inlet pressure compensation valve oil outlet 31, an oil inlet pressure compensation valve control oil port 32, a main oil inlet 33, a load sensing oil port 34, a main oil return port 35, a multi-way reversing valve connected with a load oil port I36, a multi-way reversing valve connected with a load oil port II 37, a multi-way reversing valve connected with a load oil port I38 and a multi-way reversing valve connected with a load oil port II 39.

Wherein, the multi-way directional valve is connected with a first 1 and a second 2 in parallel, the multi-way directional valve is connected with a first valve core 3 and a first pressure compensation valve 5 on the first 1, the multi-way directional valve is connected with a second valve core 4 and a second pressure compensation valve 6 on the second 2, the multi-way directional valve is connected with a first oil inlet channel 7 and a second oil inlet channel 8 in communication with a main oil inlet 33, the multi-way directional valve is connected with a first pressure compensation oil inlet channel 9 in communication with a first pressure compensation valve oil outlet channel 17, the multi-way directional valve is connected with a second pressure compensation oil inlet channel 10 in communication with a second pressure compensation valve oil outlet channel 18, the multi-way directional valve is connected with a first oil return channel 11 and a second oil return channel 12 in communication with a main oil return port 35, the first load sensing oil outlet 19 of the pressure compensation valve and the second load sensing oil outlet 20 of the pressure compensation valve are in communication with a load sensing oil inlet 34, and the oil inlet 24 is in communication with the main oil inlet 33, a bypass valve oil outlet 25 is communicated with a main oil return port 35, a bypass valve spring 26 is arranged on the right side of the bypass valve 23, a bypass valve control force 27 is acted on the left side of the bypass valve 23, an oil inlet pressure compensation valve spring 29 is arranged on the right side of an oil inlet pressure compensation valve 28, an oil inlet 30 of the oil inlet pressure compensation valve is communicated with a main oil inlet 33, an oil outlet 31 of the oil inlet pressure compensation valve is communicated with the main oil return port 35, an oil inlet pressure compensation valve control oil port 32 is communicated with a load sensing oil port 34, a multi-way reversing valve is connected with a load oil port I36 and a multi-way reversing valve is connected with a load oil port II 37 on a multi-way reversing valve connector I1, a multi-way reversing valve is connected with a load oil port I38 and a multi-way reversing valve is connected with a load oil port II 39 on a multi-way reversing valve connector II 2, when the main oil inlet 33 is connected with each multi-way reversing valve, under the action of the bypass valve spring 26, a bypass valve oil inlet 24 is communicated with the bypass valve oil outlet 25 through the bypass valve 23 and then communicated with the main oil return port 35, when the oil is fed from the main oil inlet 33 and the multi-way reversing valve 1, the bypass valve control force 27 is applied to the left side of the bypass valve 23 to overcome the force of the bypass valve spring 26, so that the spool of the bypass valve 23 moves to the right to gradually close the oil return channel of the bypass valve oil inlet 24, thereby gradually cutting off the passage between the main oil inlet 33 and the main oil return port 35, the hydraulic oil is fed to the pressure compensation valve I oil inlet 15 through the multi-way reversing valve I oil inlet 7, the pressure compensation valve I5 starts to work, the pressure compensation valve I oil outlet 17 outputs pressure oil to the multi-way reversing valve I pressure compensation oil inlet 9 through the multi-way reversing valve I spool 3 and then supplies oil to the multi-way reversing valve 1 load oil port, and the pressure compensation valve I load sensing oil outlet 19 and the pressure compensation valve II load sensing oil outlet 20 and the oil inlet pressure sensing oil port 32 and the load sensing oil port 34 both have oil pressure, the pressure of the first pressure compensation valve oil outlet channel 17 and the first pressure compensation valve load sensing oil outlet 19 is determined by the load of the first multiple directional control valve 1 load oil port, meanwhile, the pressure of the first pressure compensation valve load sensing oil outlet 19 acts on the lower ends of the first pressure compensation valve 5 and the second pressure compensation valve 6, the oil inlet pressure compensation valve 28 starts to work under the combined action of the oil pressure of the oil inlet 30 of the oil inlet pressure compensation valve and the oil inlet pressure compensation valve control oil port 32 and the force of the oil inlet pressure compensation valve spring 29, the working principle of the second multiple directional control valve 2 is the same as that of the first multiple directional control valve 1, when the first multiple directional control valve 1 and the second multiple directional control valve 2 work simultaneously, the pressure of the load sensing valve 34 is the maximum load sensing pressure and acts on the lower ends of the two pressure compensation valves, and the oil port is supplied to the first multiple directional control valve in proportion in a shunting manner, therefore, low-pressure oil return through the bypass oil way is realized when the multi-way reversing valve hydraulic system does not work, and oil is supplied to the multi-way reversing valve in a proportionally shunting manner according to load induction pressure during work.

Claims

1. A bypass load sensing multi-way reversing valve hydraulic system is characterized in that: the pressure and flow control of the bypass load sensing multi-way reversing valve hydraulic system is completed by a bypass loop and a load sensing pressure compensation valve loop together, and comprises a multi-way reversing valve I (1), a multi-way reversing valve II (2), a multi-way reversing valve I (3), a multi-way reversing valve II (4), a pressure compensation valve I (5), a pressure compensation valve II (6), a multi-way reversing valve I (7), a multi-way reversing valve II (8), a multi-way reversing valve I (9), a multi-way reversing valve II (10), a multi-way reversing valve II (11), a multi-way reversing valve II (12), a multi-way reversing valve II (13), a multi-way reversing valve II (14) and a pressure compensation valve I (15), a pressure compensation valve two oil inlet channel (16), a pressure compensation valve one oil outlet channel (17), a pressure compensation valve two oil outlet channel (18), a pressure compensation valve one load sensing oil outlet (19), a pressure compensation valve two load sensing oil outlet (20), a multi-way reversing valve connected with a bypass oil inlet channel (21), a multi-way reversing valve connected with a two bypass oil inlet channel (22), a bypass valve (23), a bypass valve oil inlet (24), a bypass valve oil outlet (25), a bypass valve spring (26), a bypass valve control force (27), an oil inlet pressure compensation valve (28), an oil inlet pressure compensation valve spring (29), an oil inlet pressure compensation valve oil inlet (30), an oil inlet pressure compensation valve oil outlet (31), an oil inlet pressure compensation valve control oil port (32), a main oil inlet (33), a load sensing oil port (34), a main oil return port (35), and a multi-way reversing valve connected with a load oil port one (36), the multi-way reversing valve is connected with a load oil port II (37), the multi-way reversing valve is connected with a load oil port I (38), the multi-way reversing valve is connected with a load oil port II (39), the multi-way reversing valve is connected with a load oil port I (1) and a multi-way reversing valve II (2) in parallel, the multi-way reversing valve is connected with a valve core (3) and a pressure compensation valve I (5) on the multi-way reversing valve I (1), the multi-way reversing valve is connected with a valve core (4) and a pressure compensation valve II (6) on the multi-way reversing valve II (2), the multi-way reversing valve is connected with an oil inlet channel (7) and a multi-way reversing valve II oil inlet channel (8) and a main oil inlet (33), the multi-way reversing valve is connected with a pressure compensation oil inlet channel (9) and a pressure compensation valve I oil outlet channel (17), the multi-way reversing valve is connected with an oil return channel II (10) and a pressure compensation valve II oil outlet channel (18), the multi-way reversing valve is connected with a pressure compensation oil inlet channel (11) and a main oil outlet (12) and a main oil return channel (35), a bypass oil outlet channel (13) of a multi-way directional valve is communicated with a main oil return port (35), a bypass oil outlet channel (14) of a multi-way directional valve is communicated with a bypass oil inlet channel (21), a bypass oil inlet channel (22) of a multi-way directional valve is communicated with a main oil inlet (33), a load sensing oil outlet (19) of a pressure compensation valve and a load sensing oil outlet (20) of a pressure compensation valve are communicated with a load sensing oil port (34), a bypass valve oil inlet (24) is communicated with a main oil inlet (33), a bypass valve oil outlet (25) is communicated with the main oil return port (35), a bypass valve spring (26) is arranged on the right side of the bypass valve (23), a bypass valve control force (27) acts on the left side of the bypass valve (23), an oil inlet pressure compensation valve spring (29) is arranged on the right side of the oil inlet pressure compensation valve (28), and an oil inlet (30) of the oil inlet pressure compensation valve is communicated with the main oil inlet (33), an oil outlet (31) of an oil inlet pressure compensation valve is communicated with a main oil return port (35), an oil inlet pressure compensation valve control oil port (32) is communicated with a load sensing oil port (34), a multi-way reversing valve is connected with a load oil port I (36) and a multi-way reversing valve is connected with a load oil port II (37) on the multi-way reversing valve I (1), the multi-way reversing valve is connected with a load oil port I (38) and the multi-way reversing valve is connected with a load oil port II (39) on the multi-way reversing valve II (2), when oil is fed into a main oil inlet (33) and the multi-way reversing valves are not operated, hydraulic oil passes through the multi-way reversing valve II bypass oil inlet channel (22), the multi-way reversing valve II valve core (4), the multi-way reversing valve II bypass oil inlet channel (14), the multi-way reversing valve II bypass oil inlet channel (21), the multi-way reversing valve I valve core (3), the multi-way reversing valve bypass oil outlet channel (13) and the main oil return port (35), under the action of a bypass valve spring (26), a bypass valve oil inlet (24) is communicated with a bypass valve oil outlet (25) through a bypass valve (23) and then communicated with a main oil return port (35) for oil return, low-pressure standby work of the system is realized, when oil enters a main oil inlet (33) and a multi-way reversing valve is connected with a main oil return port (1) for work, a multi-way reversing valve is connected with a valve core (3) to move, a bypass oil outlet channel (13) of the multi-way reversing valve and a bypass oil inlet channel (21) of the multi-way reversing valve are connected with each other to be gradually cut off, meanwhile, a bypass valve control force (27) is applied to the left side of the bypass valve (23) to overcome the force of the bypass valve spring (26) to enable the valve core of the bypass valve (23) to move right to gradually close an oil return channel of the bypass valve oil inlet (24), namely, the channel of a main oil inlet (33) and the main oil return port (35) is gradually cut off, hydraulic oil enters an oil inlet channel (15) of a pressure compensation valve through an oil inlet channel (7) of the multi-way reversing valve, the first pressure compensation valve (5) starts to work, pressure oil is output to the first pressure compensation oil outlet channel (17) of the first pressure compensation valve and is connected with the first pressure compensation oil inlet channel (9) of the multi-way reversing valve and is supplied to the first load oil port (1) of the multi-way reversing valve through the first valve core (3) of the multi-way reversing valve, oil pressure is provided for the first load sensing oil outlet (19) of the first pressure compensation valve, the second load sensing oil outlet (20) of the second pressure compensation valve, the control oil port (32) of the oil inlet pressure compensation valve and the load sensing oil port (34), pressure of the first pressure compensation valve oil outlet channel (17) of the first pressure compensation valve and the first load sensing oil outlet (19) of the first pressure compensation valve is determined by the load size of the first load oil port (1) of the multi-way reversing valve, pressure of the first load sensing oil outlet (19) of the pressure compensation valve acts on the lower ends of the first pressure compensation valve (5) and the second pressure compensation valve (6), pressure of the oil inlet pressure compensation valve (30) of the oil inlet pressure compensation valve and the control oil inlet pressure oil port (32) of the oil inlet pressure compensation valve The oil inlet pressure compensation valve (28) starts to work under the combined action of the force of the pressure compensation valve spring (29), the working principle of the multi-way reversing valve unit I (2) is the same as that of the multi-way reversing valve unit I (1), when the multi-way reversing valve unit I (1) and the multi-way reversing valve unit I (2) work simultaneously, the pressure of the load sensing oil port (34) is the maximum load sensing pressure and acts on the lower ends of the two pressure compensation valves, oil is supplied to the multi-way reversing valve unit in a proportionally shunting manner, accordingly, low-pressure oil return through a bypass oil way is achieved when a hydraulic system of the multi-way reversing valve does not work, and oil is supplied to the multi-way reversing valve unit in a proportionally shunting manner according to the load sensing pressure during work.

2. A by-pass load sensing multiple directional control valve hydraulic system as defined in claim 1, wherein: the bypass oil path is only provided with a multi-path reversing valve connected bypass oil path.

3. A by-pass load sensing multiple directional control valve hydraulic system as defined in claim 1, wherein: the bypass oil path is a bypass oil path only with a bypass valve.