CN221442984U - Distribution valve, constant-variable hydraulic system and loader - Google Patents
Distribution valve, constant-variable hydraulic system and loader Download PDFInfo
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- CN221442984U CN221442984U CN202323455140.1U CN202323455140U CN221442984U CN 221442984 U CN221442984 U CN 221442984U CN 202323455140 U CN202323455140 U CN 202323455140U CN 221442984 U CN221442984 U CN 221442984U
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- 239000003921 oil Substances 0.000 abstract description 295
- 239000010720 hydraulic oil Substances 0.000 abstract description 23
- 238000010792 warming Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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- 238000006073 displacement reaction Methods 0.000 description 1
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Abstract
The utility model relates to a hydraulic technology, in order to solve the problem that the loader starts hydraulic oil to raise temperature in a low-temperature environment, the utility model constructs a distributing valve, a fixed-variable hydraulic system and the loader, wherein the distributing valve comprises a first main oil way communicated with an oil inlet of a first main linkage valve, a second main oil way communicated with an oil inlet of a second main linkage valve, a main oil return way, a low-pressure unloading valve group and a three-way compensator; an oil inlet of the three-way compensator is communicated with the first main oil way, an oil outlet of the three-way compensator is communicated with the main oil return oil way, and a spring control cavity of the three-way compensator is connected with an LS oil way of the first main valve; the low-pressure unloading valve group comprises an unloading valve and an unloading control electromagnetic valve, wherein an oil inlet and an oil outlet of the unloading valve are correspondingly communicated with the first main oil way and the main oil return oil way; an oil outlet of the unloading control electromagnetic valve is connected with a hydraulic control end of the unloading valve and used for controlling the unloading valve to be switched on or off. The utility model can realize the purpose of warming up on the loader.
Description
Technical Field
The present disclosure relates to hydraulic technology, and more particularly, to a distribution valve, a constant-variable hydraulic system, and a loader.
Background
When working a working machine, it is necessary that the hydraulic pressure of its hydraulic system is kept at a suitable temperature so that the oil has a viscosity suitable for flowing in the pipeline. When the engineering machinery is just started, the oil in the hydraulic system is similar to the ambient temperature, and the warming-up operation is required to be performed for a corresponding time according to the oil temperature of the hydraulic oil, so that the temperature of the hydraulic oil reaches the requirement of normal operation of the hydraulic system.
Disclosure of utility model
The utility model aims to solve the technical problem that a loader starts hydraulic oil to heat in a low-temperature environment, and provides a distributing valve, a constant-variable hydraulic system and the loader.
The technical scheme for achieving the purpose of the utility model is as follows: the distribution valve comprises a first main connecting valve and a second main connecting valve which are in a neutral position closing function, a first main oil way communicated with an oil inlet of the first main connecting valve, a second main oil way communicated with an oil inlet of the second main connecting valve, a main oil return way, a low-pressure unloading valve group and a three-way compensator;
An oil inlet of the three-way compensator is communicated with a first main oil way, an oil outlet of the three-way compensator is communicated with a main oil return oil way, and a spring control cavity of the three-way compensator is connected with an LS oil way of a first main valve;
The low-pressure unloading valve group comprises an unloading valve and an unloading control electromagnetic valve, wherein an oil inlet and an oil outlet of the unloading valve are correspondingly communicated with the first main oil way and the main oil return oil way; an oil outlet of the unloading control electromagnetic valve is connected with a hydraulic control end of the unloading valve and used for controlling the unloading valve to be switched on or off.
In the distributing valve, the distributing valve also comprises a converging valve and a converging control valve; two main oil ports of the confluence valve are correspondingly communicated with an oil inlet of the first main connecting valve and the second main oil way; the hydraulic control end of the confluence control valve is connected with the hydraulic control end of the confluence valve and used for controlling the connection or disconnection of two main oil ports of the confluence valve, the first main oil way is communicated with an oil inlet of the first main connecting valve through a one-way valve, an oil inlet of the unloading valve is connected with an oil inlet end of the one-way valve, and one main oil port of the confluence valve is connected with an oil outlet end of the one-way valve; the LS oil circuit of the first main linkage valve and the LS oil circuit of the second main linkage valve are connected with the converging valve and are configured to be mutually communicated when the converging valve is in a converging and conducting working position, and the LS oil circuit of the first main linkage valve and the LS oil circuit of the second main linkage valve are mutually blocked when the converging valve is in a converging and blocking working position.
In the distributing valve, an unloading control electromagnetic valve is connected with a hydraulic control end of an unloading valve through a heavy-load unloading control valve; the heavy load unloading control valve is a two-position three-way valve, an oil outlet of the heavy load unloading control valve is connected with a hydraulic control end of the unloading valve, an oil inlet of the heavy load unloading control valve is connected with an oil outlet of the unloading control electromagnetic valve, an oil return port of the heavy load unloading control valve is connected with a main oil return path, one oil outlet of the heavy load unloading control valve is communicated with the oil inlet or the oil return port, and the oil inlet is communicated with the oil outlet in a normal state;
The hydraulic control end of the heavy load unloading control valve is connected with the converging valve and is configured to be communicated with the LS oil way of the first main connecting valve through the converging valve when the converging valve is in the converging and conducting working position, and the hydraulic control end of the heavy load unloading control valve is communicated with the main oil return oil way through the converging valve when the converging valve is in the converging and stopping working position.
In the distributing valve, the distributing valve comprises a pilot oil supply path and a pressure reducing valve; an oil inlet of the pressure reducing valve is connected with a second main oil way, and an oil outlet of the pressure reducing valve is connected with a pilot oil supply oil way; and an oil inlet of the unloading control electromagnetic valve and an oil inlet of the converging control valve are connected with a pilot oil supply oil way.
In the distributing valve, the unloading control electromagnetic valve is a two-position three-way valve, an oil return port of the unloading control electromagnetic valve is connected with an auxiliary oil return path, and one oil outlet of the unloading control electromagnetic valve is connected with an oil inlet or an oil return port;
The oil inlet of the confluence control valve is connected with the pilot oil supply oil way, the oil return port of the confluence control valve is connected with the auxiliary oil return oil way, and one oil outlet of the confluence control valve is connected with the oil inlet or the oil return port.
In the distributing valve, each hydraulic control end of the first main linkage valve and each hydraulic control end of the second main linkage valve are connected with the electric proportional valve, and an oil inlet of each electric proportional valve is connected with a pilot oil supply oil way.
The technical scheme for achieving the purpose of the utility model is as follows: providing a constant-variable hydraulic system, comprising a steering hydraulic system and a working hydraulic system, wherein the working hydraulic system is provided with the distribution valve; the first main oil way of the distribution valve is communicated with the gear pump; and an EF port of the flow amplifying valve is communicated with a second main oil way of the distribution valve, and an LS oil way of the second linkage main valve and an LS oil way of the flow amplifying valve in the distribution valve are connected with the steering variable pump through a shuttle valve.
In the constant and variable hydraulic system, the constant and variable hydraulic system further comprises a brake hydraulic system, and an oil inlet of a charging valve in the brake hydraulic system is connected with a CF (compact flash) port of a flow amplifying valve.
The technical scheme for achieving the purpose of the utility model is as follows: there is provided a loader having the aforementioned distribution valve or having the aforementioned constant-volume hydraulic system.
Compared with the prior art, in the utility model, when the temperature of hydraulic oil is required to be warmed up and lifted, the low-pressure unloading valve is closed through the unloading control electromagnetic valve, oil in the first main oil way flows out through the three-way compensator and the main oil return oil way, and when hydraulic oil flows through the three-way compensator, energy conversion occurs, the temperature of the hydraulic oil is raised, and the purpose of warming up is realized.
Drawings
Fig. 1 is a schematic diagram of a dispensing valve of the present utility model.
Fig. 2 is a schematic diagram of a constant volume hydraulic system of the present utility model.
Part names and serial numbers in the figure:
The distribution valve 100, the first main-connecting valve 1, the first main oil path 2, the second main-connecting valve 3, the second main oil path 4, the main oil return oil path 5, the unloading valve 6, the heavy-load unloading control valve 7, the three-way compensator 8, the unloading control electromagnetic valve 9, the converging valve 10, the converging control valve 11, the pressure reducing valve 12, the pilot oil supply oil path 13, the first LS oil path 14, the electric proportional valve 15, the second LS oil path 16, the auxiliary oil return oil path 17 and the one-way valve 18.
Hydraulic oil tank 101, gear pump 102, bucket cylinder 103, boom cylinder 104.
Steering variable pump 201, flow amplifying valve 202, steering cylinder 203, steering gear 204, and shuttle valve 205.
A charging valve 301, a service brake valve 302, a service brake 303, a parking brake valve 304, and a parking brake 305.
Detailed Description
The following describes specific embodiments with reference to the drawings.
As shown in fig. 1, the distribution valve 100 includes a first main-joint valve 1, a second main-joint valve 3, a low-pressure unloading valve group, a three-way compensator 8, a heavy-load unloading control valve 7, and the like, and is provided with a first main oil passage 2, a second main oil passage 4, a main oil return passage 5, and a sub oil return passage 17.
The first combined main valve 1 and the second combined main valve 3 are closed-middle-position hydraulic control valves, and when the first combined main valve is in the middle position, an oil inlet of the first combined main valve cannot flow to the main oil return oil way 5 through a valve core oil way.
The first main oil way 2 and the second main oil way 4 are all working oil inlet oil ways and are communicated with a working pressure oil source.
The main oil return path 5 and the auxiliary oil return path 17 are both paths communicated with the hydraulic oil tank through a pipeline, and normally, the main oil return path is used for large-flow oil return of a hydraulic actuator driving path, and the main oil return path flows back to the hydraulic oil tank through a radiator, an oil filter and the like, and back pressure is often present in the main oil return path. The auxiliary oil return passage 17 is used for controlling the return oil flow direction of the oil passage to the hydraulic oil tank, and the back pressure is small. Under the condition that the back pressure does not influence the control, the main oil return oil way and the auxiliary oil return oil way can be communicated and combined in the distributing valve.
The first main oil passage 2 is connected to an oil inlet of the first main valve 1 via a check valve 18, and is configured to supply working pressure oil to the first main valve 1. The second main oil passage 4 is connected to an oil inlet of the second main joint valve 3, and is configured to supply the second main joint valve 3 with hydraulic oil.
The low-pressure unloading valve group comprises an unloading valve 6 and an unloading control electromagnetic valve 9, an oil inlet of the unloading valve 6 is connected with the first main oil way 2 and is connected with an oil inlet end of a one-way valve 18, and an oil outlet of the unloading valve 6 is connected with the main oil return way 5. An oil outlet of the unloading control electromagnetic valve 9 is connected with a hydraulic control end of the unloading valve 6 and is used for controlling the connection or disconnection of the unloading valve 6.
The oil inlet of the three-way compensator 8 is communicated with the first main oil way 2, the oil outlet is communicated with the main oil return oil way 5, and the spring control cavity is communicated with the first LS oil way 14 of the first main valve 1.
In this embodiment, during the warm-up operation, the unloading control solenoid valve 9 may be controlled to make the output pressure oil thereof act on the hydraulic control end of the unloading valve 6, so that the unloading valve 6 is in a cut-off state, thereby holding high the pressure of the first main oil path 2, and after the pressure of the first main oil path 2 reaches a predetermined value, the first main oil path 2 flows out of the three-way compensator 8, flows to the hydraulic oil tank 101 through the main oil return oil path 5, so as to achieve the high-pressure unloading of the first main oil path 2, and when the hydraulic oil flows through the three-way compensator 8, energy conversion occurs, the temperature of the hydraulic oil increases, so as to achieve the warm-up purpose.
Optionally, the distribution valve 100 further includes a merging valve 10 and a merging control valve 11; two main oil ports of the confluence valve 10 are correspondingly communicated with an oil inlet of the first main valve 1 and the second main oil way 4; the confluence control valve 11 is connected with a hydraulic control end of the confluence valve 10 and is used for controlling the connection or disconnection between two main oil ports of the confluence valve 10, the first main oil way 2 is connected with an oil inlet of the first main valve 1 through the one-way valve 18, an oil inlet of the unloading valve 6 is connected with an oil inlet end of the one-way valve 18, and a main oil port of the confluence valve 10 is connected with an oil outlet end of the one-way valve 18. When the merging valve 10 is in the merging/conducting operation position, the pressure oil in the first main oil passage 2 and the second main oil passage 4 is merged and supplied to the first main valve 1 or the second main valve 3. When the merging valve 10 is in the merging-cut-off operation position, the first main oil passage 2 supplies oil to the first main merging valve 1, and the second main oil passage 4 supplies oil to the second main merging valve 3.
The first LS oil passage 14 of the first main-coupling valve 1 and the second LS oil passage 16 of the second main-coupling valve 3 are both connected to the merging valve 10 and are arranged such that the first LS oil passage 14 and the second LS oil passage 16 are mutually communicated when the merging valve 10 is in the merging-on operation position, and the first LS oil passage 14 and the second LS oil passage 16 are mutually blocked when the merging valve 10 is in the merging-off operation position.
Alternatively, the unloading control solenoid valve 9 is connected to the pilot operated end of the unloading valve 6 via a heavy load unloading control valve 7. The heavy load unloading control valve 7 is a two-position three-way valve, an oil outlet of the heavy load unloading control valve 7 is connected with a hydraulic control end of the unloading valve 6, an oil inlet of the heavy load unloading control valve 7 is connected with an oil outlet of the unloading control electromagnetic valve 9, an oil return port of the heavy load unloading control valve 7 is connected with the main oil return oil way 5, one oil outlet of the heavy load unloading control valve 7 is communicated with the oil inlet or the oil return port, and the oil inlet is communicated with the oil outlet normally.
The hydraulic control end of the heavy load unloading control valve 7 is connected with the converging valve 10, and is configured such that the hydraulic control end of the heavy load unloading control valve 7 is communicated with the first LS oil path 14 through the converging valve 10 when the converging valve 10 is in the converging-on working position, and the hydraulic control end of the heavy load unloading control valve 7 is communicated with the main oil return oil path 5 through the converging valve 10 when the converging valve 10 is in the converging-off working position.
Optionally, the unloading control electromagnetic valve 9 is a two-position three-way valve, an oil inlet of the unloading control electromagnetic valve 9 is connected with the pilot oil supply oil way 13, an oil return port of the unloading control electromagnetic valve 9 is connected with the auxiliary oil return oil way 17, an oil outlet of the unloading control electromagnetic valve 9 is connected with an oil inlet of the heavy-load unloading control valve 7, and an oil outlet of the unloading control electromagnetic valve 9 is alternatively connected with the oil inlet or the oil return port.
The converging control valve 11 is a two-position three-way electromagnetic valve, an oil inlet of the converging control valve 11 is connected with the pilot oil supply oil way 13, an oil return port of the converging control valve 11 is connected with the auxiliary oil return oil way 17, an oil outlet of the converging control valve 11 is connected with a hydraulic control end of the converging valve 10, and one oil outlet of the converging control valve 11 is connected with the oil inlet or the oil return port.
Each hydraulic control end of the first combined main valve 1 and the second combined main valve 3 is connected with an electric proportional valve 15, and an oil inlet of each electric proportional valve 15 is connected with a pilot oil supply oil path 13.
The distribution valve 100 further includes a pilot oil supply passage 13 and a pressure reducing valve 12; an oil inlet of the pressure reducing valve 12 is connected with the second main oil path 4, and an oil outlet of the pressure reducing valve 12 is connected with the pilot oil supply oil path 13. The pressure reducing valve 12 reduces the pressure of the high-pressure oil from the second main oil passage 4 to low-pressure pilot control oil, and supplies the pilot control oil to each solenoid valve and the electro proportional valve.
This embodiment provides a constant-volume hydraulic system having the aforementioned distribution valve 100, as shown in fig. 2.
The embodiment provides a loader, which is provided with the constant-variable hydraulic system. As shown in fig. 2, the constant-variable hydraulic system of the loader includes a working hydraulic system and a steering hydraulic system.
The working hydraulic system includes the aforementioned distribution valve 100, the gear pump 102, the swing arm cylinder 103, and the boom cylinder 104, the gear pump 102 communicates with the first main oil passage 2 of the distribution valve 100, and the hydraulic oil is sucked from the hydraulic oil tank 101 to be supplied to the first main oil passage 2 of the distribution valve 100. The rotating bucket cylinder 103 is connected with the working oil port of the first main valve 1. The boom cylinder 104 is connected with two working oil ports of the second linkage main valve 3. The main oil return path 5 of the distributing valve 100 returns to the hydraulic oil tank 101 through the radiator and the oil return filter, and the auxiliary oil return path 17 is communicated with the hydraulic oil tank.
The steering hydraulic system comprises a steering variable pump 201, a flow amplifying valve 202, a steering oil cylinder 203 and a steering gear 204, wherein an oil suction port of the steering variable pump 201 is connected with the hydraulic oil tank 101, and a pump port is connected with an oil inlet of the flow amplifying valve 202. The steering 204 is connected to the flow amplifying valve 202, and is used for controlling the flow amplifying valve 202, and the steering cylinder 203 is connected to the flow amplifying valve 202.
The EF port of the flow amplifying valve 202 is connected to the second main oil passage 4 of the distribution valve 100, and the CF port of the flow amplifying valve 202 is connected to the charging valve 301 in the brake hydraulic system.
Optionally, the constant volume hydraulic system further comprises a brake hydraulic system. The brake hydraulic system includes a charging valve 301, a service brake valve 302 connected to the charging valve 301, a service brake 303 connected to the service brake valve 302, a parking brake valve 304 connected to the charging valve 301, and a parking brake 305 connected to the parking brake valve 304. The LS1 port of the flow amplifying valve 202 is connected with the S1 port of the charging valve 301, the S port of the charging valve 301 is connected with the LS port of the flow amplifying valve 202 and the first oil inlet end of the shuttle valve 205, the second oil inlet end of the shuttle valve 205 is communicated with the second LS oil path 16 of the second linkage main valve 3 in the distributing valve 100, and the oil outlet end of the shuttle valve 205 is connected with the load feedback input port of the steering variable pump 201. The steering load pressure signal of the flow amplifying valve 202 is transmitted to the charging valve 301, and after being compared with the charging pressure signal of the charging valve 301, the pressure signal with larger pressure is output through the S port of the charging valve 301, acts on the LS port of the flow amplifying valve 202 and is used for controlling the priority valve in the flow amplifying valve 202, the other path of pressure signal with larger pressure acts on the steering variable pump 201 after being compared with the load pressure signal output by the distributing valve 100 through the shuttle valve 205, and the displacement of the steering variable pump 201 is regulated according to the load feedback input port.
In the invention, when the hydraulic oil temperature of the machine is lower and the warming-up and oil temperature lifting are needed, the movable arm lifting and bucket retraction operation is not carried out, the first main connecting valve 1 and the second main connecting valve 3 are both in the middle position, the converging valve 10 is controlled by the converging control valve 11 to work in the converging stop position, the first LS oil way 14 of the first main connecting valve 1 is communicated with the main oil return oil way 5, and the heavy load unloading control valve 7 is in the upper position (the oil inlet is communicated with the oil outlet). The unloading control electromagnetic valve 9 is electrified, the oil inlet is communicated with the oil outlet, and the pilot pressure oil in the pilot oil supply oil path 13 acts on the hydraulic control end of the unloading valve 6 through the unloading control electromagnetic valve 9 and the heavy load unloading control valve 7 to stop the unloading valve 6. The pressure oil in the first main oil way 2 is unloaded from the three-way compensator 8 after being suppressed in height, and when the pressure oil flows through the three-way compensator 8, energy conversion occurs, the temperature of hydraulic oil rises, and the purpose of warming up is achieved. When the warm-up operation is performed, the steering variable pump 201 operates in the standby state, absorbing a small power.
When the hydraulic oil temperature rises by a large target value and enters a standby state, the unloading control electromagnetic valve 9 is powered off, an oil return port of the unloading control electromagnetic valve 9 is communicated with an oil outlet, a hydraulic control end of the unloading valve 6 is communicated with the auxiliary oil return oil way 17 through the heavy-load unloading control valve 7 and the unloading control electromagnetic valve 9 to be in a conducting position, and the first main oil way 2 is unloaded at low pressure through the unloading valve 6. When the hydraulic system is unloading at low pressure, the gear pump 102 absorbs less power.
When the single action of lifting the rotating bucket or the movable arm is carried out, the converging control valve 11 and the unloading control electromagnetic valve 9 are powered on, the converging valve 10 is in a converging and conducting working position, and the load pressure in the first LS oil way 14 or the second LS oil way 16 acts on the hydraulic control end of the heavy load unloading control valve 7 through the converging valve 10, but before the load pressure reaches a set value, the load pressure can not cause the heavy load unloading control valve 7 to change direction, and the oil inlet and the oil outlet of the heavy load unloading control valve 7 are conducted. The pilot pressure oil in the pilot oil supply path 13 acts on the hydraulic control end of the unloading valve 6 through the unloading control electromagnetic valve 9 and the heavy load unloading control valve 7 to enable the unloading valve 6 to be in a cut-off state, and the pressure oil from the steering variable pump 201 is converged and supplied to the first main valve 1 or the second main valve 3 through the second main oil path 4 and the pressure oil from the gear pump 102 through the first main oil path 2, so that single-action light load combined oil supply is realized. When the single-action heavy load operation is performed, namely, when the load pressure in the first LS oil way 14 or the second LS oil way 16 exceeds a set value, the pressure of the hydraulic control end of the heavy load unloading control valve 7 is reversed against the elastic force of the spring cavity, the oil outlet of the heavy load unloading control valve 7 is communicated with the oil return port, the unloading valve 6 is in a conducting position, the oil in the first main oil way 2 is unloaded at low pressure through the unloading valve 6, and at the moment, the first main valve 1 or the second main valve 3 is supplied with oil through the second main oil way 4 by the steering variable pump 201, so that the heavy load single-pump oil supply operation is realized.
When the combined operation is performed, the confluence control valve 11 is turned off, and the confluence valve 10 is at the confluence cut-off position. The hydraulic control end of the heavy load unloading control valve 7 is communicated with the main oil return path 5 through the converging valve 10, and the heavy load unloading control valve 7 is in an upper position. The unloading control electromagnetic valve 9 is powered on, the pressure oil of the pilot oil supply oil way 13 acts on the hydraulic control end of the unloading valve 6 through the unloading control electromagnetic valve 9 and the heavy load unloading control valve 7, the unloading valve 6 is in a stop position, and the pressure oil supplied by the gear pump 102 is supplied to the first main valve 1 through the first main oil way 2, so that the rotating bucket action is realized. The second LS oil passage 16 of the second main linkage valve 3 transmits a load pressure signal to the steering variable pump 201 through the shuttle valve 205, and the steering variable pump 201 outputs a corresponding flow according to the load pressure signal to supply oil to the second main linkage valve 3 through the flow amplifying valve 202 and the second main oil passage 4, thereby realizing a boom lifting operation.
Claims (10)
1. The distribution valve comprises a first main connecting valve and a second main connecting valve which are in a neutral position closing function, a first main oil way communicated with an oil inlet of the first main connecting valve, a second main oil way communicated with an oil inlet of the second main connecting valve, a main oil return way and a low-pressure unloading valve group, and is characterized by further comprising a three-way compensator;
An oil inlet of the three-way compensator is communicated with a first main oil way, an oil outlet of the three-way compensator is communicated with a main oil return oil way, and a spring control cavity of the three-way compensator is connected with an LS oil way of a first main valve;
The low-pressure unloading valve group comprises an unloading valve and an unloading control electromagnetic valve, wherein an oil inlet and an oil outlet of the unloading valve are correspondingly communicated with the first main oil way and the main oil return oil way; an oil outlet of the unloading control electromagnetic valve is connected with a hydraulic control end of the unloading valve and used for controlling the unloading valve to be switched on or off.
2. The dispensing valve in accordance with claim 1 in which said dispensing valve further comprises a converging valve and a converging control valve; two main oil ports of the confluence valve are correspondingly communicated with an oil inlet of the first main connecting valve and the second main oil way; the hydraulic control end of the confluence control valve is connected with the hydraulic control end of the confluence valve and used for controlling the connection or disconnection of two main oil ports of the confluence valve, the first main oil way is communicated with an oil inlet of the first main connecting valve through a one-way valve, an oil inlet of the unloading valve is connected with an oil inlet end of the one-way valve, and one main oil port of the confluence valve is connected with an oil outlet end of the one-way valve;
The LS oil circuit of the first main linkage valve and the LS oil circuit of the second main linkage valve are connected with the converging valve and are configured to be mutually communicated when the converging valve is in a converging and conducting working position, and the LS oil circuit of the first main linkage valve and the LS oil circuit of the second main linkage valve are mutually blocked when the converging valve is in a converging and blocking working position.
3. The dispensing valve of claim 2 wherein the unloading control solenoid valve is connected to the pilot operated end of the unloading valve via a heavy duty unloading control valve; the heavy load unloading control valve is a two-position three-way valve, an oil outlet of the heavy load unloading control valve is connected with a hydraulic control end of the unloading valve, an oil inlet of the heavy load unloading control valve is connected with an oil outlet of the unloading control electromagnetic valve, an oil return port of the heavy load unloading control valve is connected with a main oil return path, one oil outlet of the heavy load unloading control valve is communicated with the oil inlet or the oil return port, and the oil inlet is communicated with the oil outlet normally.
4. The distribution valve according to claim 3, characterized in that the hydraulic control end of the heavy load unloading control valve is connected to the converging valve and is configured such that the hydraulic control end of the heavy load unloading control valve is communicated with the LS oil path of the first main connecting valve via the converging valve when the converging valve is in the converging-on operation position, and the hydraulic control end of the heavy load unloading control valve is communicated with the main oil return path via the converging valve when the converging valve is in the converging-off operation position.
5. A distribution valve according to claim 3, characterized in that the distribution valve comprises a pilot oil supply line and a pressure reducing valve; an oil inlet of the pressure reducing valve is connected with a second main oil way, and an oil outlet of the pressure reducing valve is connected with a pilot oil supply oil way; and an oil inlet of the unloading control electromagnetic valve and an oil inlet of the converging control valve are connected with a pilot oil supply oil way.
6. The distributing valve according to claim 5, wherein the unloading control electromagnetic valve is a two-position three-way valve, an oil return port of the unloading control electromagnetic valve is connected with an auxiliary oil return path, and an oil outlet of the unloading control electromagnetic valve is alternatively connected with an oil inlet or an oil return port;
The oil inlet of the confluence control valve is connected with the pilot oil supply oil way, the oil return port of the confluence control valve is connected with the auxiliary oil return oil way, and one oil outlet of the confluence control valve is connected with the oil inlet or the oil return port.
7. The distribution valve according to any one of claims 1 to 6, characterized in that each hydraulic control end of the first and second main valves is connected with an electric proportional valve, and an oil inlet of each electric proportional valve is connected with a pilot oil supply oil path.
8. A constant volume hydraulic system comprising a steering hydraulic system, a working hydraulic system, characterized in that the working hydraulic system has a distribution valve according to any one of claims 1 to 7; a first main oil way of the distribution valve in the working hydraulic system is communicated with the gear pump; and an EF port of the flow amplifying valve is communicated with a second main oil way of the distribution valve, and an LS oil way of the second linkage main valve and an LS oil way of the flow amplifying valve in the distribution valve are connected with the steering variable pump through a shuttle valve.
9. The constant volume hydraulic system of claim 8, further comprising a brake hydraulic system, wherein an inlet of the charge valve of the brake hydraulic system is connected to a CF port of the flow amplifying valve.
10. A loader with a distribution valve according to any one of claims 1 to 7 or with a constant-volume hydraulic system according to any one of claims 8 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323455140.1U CN221442984U (en) | 2023-12-19 | 2023-12-19 | Distribution valve, constant-variable hydraulic system and loader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323455140.1U CN221442984U (en) | 2023-12-19 | 2023-12-19 | Distribution valve, constant-variable hydraulic system and loader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221442984U true CN221442984U (en) | 2024-07-30 |
Family
ID=92057791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323455140.1U Active CN221442984U (en) | 2023-12-19 | 2023-12-19 | Distribution valve, constant-variable hydraulic system and loader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221442984U (en) |
-
2023
- 2023-12-19 CN CN202323455140.1U patent/CN221442984U/en active Active
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