阅读说明：本技术 挖掘机推土铲液压系统 (Excavator dozer blade hydraulic system ) 是由 白容 邵荣刚 胡勇 陈振雄 罗柏香 郑华 于 2019-08-26 设计创作，主要内容包括：本发明涉及挖掘机推土铲液压系统,为解决现有挖掘机浮动功能和锁定功能不能兼备的问题；提供一种挖掘机推土铲液压系统,其包括推土铲油缸、主控阀、先导阀、供油装置、浮动电磁阀、设置在推土铲油缸大腔和小腔与主控阀工作油口之间油路上的油缸锁止阀,浮动电磁阀的第一油口与推土铲油缸大腔连接,第二油口与推土铲油缸小腔连接,第三油口与供油装置中的油箱回路连接,当浮动电磁阀处于浮动使能位时三油口相互导通,当浮动电磁阀处于浮动禁止位时从第一油口和第二油口向第三油口方向的油路均截止。本发明在挖掘机推土铲液压系统中设置油缸锁止阀和浮动电磁阀,实现了同时具备浮动功能和锁定功能,满足法律法规和作业需求。(The present invention relates to excavator dozer blade hydraulic systems, to solve the problems, such as that existing excavator float function and lock function cannot have both；A kind of excavator dozer blade hydraulic system is provided, it includes dozer oil cylinder, main control valve, pilot valve, fueller, floating solenoid valve, oil cylinder lockup valve between the big chamber of dozer oil cylinder and small chamber and main control valve actuator port on oil circuit is set, first hydraulic fluid port of floating solenoid valve is connect with the big chamber of dozer oil cylinder, second hydraulic fluid port is connect with the small chamber of dozer oil cylinder, third hydraulic fluid port is connect with the fuel tank circuit in fueller, the three hydraulic fluid port mutual conductions when floating solenoid valve is in floating enable bit, it is turned off when floating solenoid valve, which is in, to float and forbid from the first hydraulic fluid port and the second hydraulic fluid port to the oil circuit in third hydraulic fluid port direction.Oil cylinder lockup valve and floating solenoid valve is arranged in the present invention in excavator dozer blade hydraulic system, realizes and is provided simultaneously with float function and lock function, meets laws and regulations and job requirements.)

1. a kind of excavator dozer blade hydraulic system, including dozer oil cylinder, actuator port pass through pipeline and dozer oil respectively The big chamber of cylinder and the main control valve of small chamber connection, pilot valve, pilot valve and the main control valve and fueller that are connect with main control valve hydraulic control end Connection, it is characterised in that further include floating solenoid valve, the first work that the big chamber of dozer oil cylinder and small chamber and main control valve are set Oil cylinder lockup valve between hydraulic fluid port and the second actuator port on oil circuit, the floating solenoid valve are tool there are three hydraulic fluid port, first Hydraulic fluid port is connect with the big chamber of dozer oil cylinder, and the second hydraulic fluid port is connect with the small chamber of dozer oil cylinder, in third hydraulic fluid port and fueller The connection of fuel tank circuit, when the floating solenoid valve is in floating enable bit, its first hydraulic fluid port, the second hydraulic fluid port, third hydraulic fluid port are mutual Conducting, when the floating solenoid valve be in float forbid when from the first hydraulic fluid port and the second hydraulic fluid port to the oil circuit in third hydraulic fluid port direction It is turned off.

2. excavator dozer blade hydraulic system according to claim 1, it is characterised in that the oil cylinder lockup valve includes the One hydraulic control one-way valve and the second hydraulic control one-way valve, first hydraulic control one-way valve are arranged in the first actuator port of main control valve and push away On oil circuit between the big chamber of mamoty oil cylinder and to the big cavity direction forward conduction of dozer oil cylinder；The second hydraulic control one-way valve setting It is on oil circuit between the second actuator port and the small chamber of dozer oil cylinder of main control valve and positive to the small cavity direction of dozer oil cylinder Conducting；The reverse-conducting hydraulic control end of first hydraulic control one-way valve is connected with the second actuator port of main control valve, the second hydraulic control one-way valve Reverse-conducting hydraulic control end be connected with the first actuator port of main control valve.

3. excavator dozer blade hydraulic system according to claim 2, it is characterised in that the oil cylinder lockup valve is arranged in On dozer oil cylinder.

4. excavator dozer blade hydraulic system according to claim 2, it is characterised in that the dozer oil cylinder is by two Oil cylinder in parallel is constituted, and the big chamber and small chamber of two oil cylinders are connect after each communicating with the floating solenoid valve.

5. excavator dozer blade hydraulic system according to claim 3, it is characterised in that be both provided with institute on each oil cylinder State oil cylinder lockup valve.

6. excavator dozer blade hydraulic system according to any one of claim 1 to 5, it is characterised in that the floating electricity The automatically controlled end of magnet valve is connected to power supply by switch.

7. excavator dozer blade hydraulic system according to claim 6, it is characterised in that the floating solenoid valve is two Triple valve.

8. excavator dozer blade hydraulic system according to claim 7, it is characterised in that setting in the floating solenoid valve Have check valve, when the floating solenoid valve be in float forbid when the third hydraulic fluid port by the check valve to described first Hydraulic fluid port and the second hydraulic fluid port one-way conduction.

9. excavator dozer blade hydraulic system according to claim 6, it is characterised in that the floating solenoid valve is by first 2/2-way solenoid valve and the second 2/2-way solenoid valve are constituted, and a hydraulic fluid port of the first 2/2-way solenoid valve and the first hydraulic fluid port connect Logical, a hydraulic fluid port of the second 2/2-way solenoid valve is connected to the second hydraulic fluid port, the first 2/2-way solenoid valve and the second 2/2-way Another hydraulic fluid port of solenoid valve is connected to after being interconnected with third hydraulic fluid port.

10. excavator dozer blade hydraulic system according to claim 9, it is characterised in that the first 2/2-way solenoid valve and It is provided with check valve in second 2/2-way solenoid valve, when the first 2/2-way solenoid valve and the second 2/2-way electromagnetism Valve is in the third hydraulic fluid port that floats when forbidding by the check valve to first hydraulic fluid port and the second hydraulic fluid port one-way conduction.

Technical field

The present invention relates to a kind of excavator hydraulic systems, more specifically to a kind of excavator dozer blade hydraulic system.

Background technique

Dozer would generally be equipped on middle-size and small-size excavator, dozer is lifted by dozer oil cylinder or declined its height. For dozer, under certain operating conditions, since job requirements need dozer oil cylinder big when dozer pilot valve is in middle position Fuel tank is flowed back to after small chamber oil liquid intercommunication, makes dozer that there is float function.

But according to laws and regulations safety requirements, when dozer pilot valve is in middle position, excavator is if you do not need to dozer Float function need to lock the position of dozer, i.e., dozer is unable to automatic descending or raising.But since there are one for spool Fixed leakage, for dozer under the action of its own gravity, the position of dozer can automatic descending.To make product meet regular peace It is complete to require, it is necessary to take measures, dozer oil cylinder size chamber oil liquid is allowed to lock, make dozer that there is lock function.

Due to float function and lock function both functions, conflicting in principle, current condition is: same digging Pick machine is only equipped with one of function, cannot be equipped with two kinds of functions simultaneously.Namely it cannot be equipped with simultaneously on same excavator Dozer locking and float function, cannot meet laws and regulations and job requirements simultaneously.When not needing dozer float function, It cannot achieve lock function, be not able to satisfy laws and regulations safety requirements.When needing floating energy with dozer lock function When, it can not unlock and realize float function, not be able to satisfy job requirements.

Summary of the invention

The technical problem to be solved by the present invention is to what cannot be had both for existing excavator float function and lock function to ask Topic, and a kind of excavator dozer blade hydraulic system is provided, so that it is provided simultaneously with float function and lock function, meets laws and regulations And job requirements.

The present invention is to realize that the technical solution of its purpose is such that provide a kind of excavator dozer blade hydraulic system, is wrapped It includes dozer oil cylinder, actuator port and passes through main control valve and main control valve that pipeline is connect with the big chamber of dozer oil cylinder and small chamber respectively Pilot valve, pilot valve and the main control valve of hydraulic control end connection are connect with fueller, it is characterised in that are further included floating solenoid valve, set Set the oil cylinder between the big chamber of dozer oil cylinder and the first actuator port and the second actuator port of small chamber and main control valve on oil circuit Lock valve, the floating solenoid valve are tool there are three hydraulic fluid port, and the first hydraulic fluid port is connect with the big chamber of dozer oil cylinder, the second hydraulic fluid port and The small chamber connection of dozer oil cylinder, third hydraulic fluid port are connect with the fuel tank circuit in fueller, when the floating solenoid valve is in floating Its first hydraulic fluid port, the second hydraulic fluid port, third hydraulic fluid port mutual conduction when dynamic enable bit forbid position when the floating solenoid valve is in float When be turned off from the first hydraulic fluid port and the second hydraulic fluid port to the oil circuit in third hydraulic fluid port direction.In the present invention, the big chamber of dozer oil cylinder and It is provided with oil cylinder lockup valve between small chamber and main control valve, will not cause to push away because main control valve leaks when main control valve is in middle position Mamoty height reduces, and when main control valve is in middle position, floating solenoid valve control can be realized dozer in floating enable bit Float function is controlled when not needing float function and forbids position in floating, to realize excavator dozer blade hydraulic system It is provided simultaneously with float function and lock function, meets laws and regulations and job requirements.

In above-mentioned excavator dozer blade hydraulic system, the oil cylinder lockup valve includes the first hydraulic control one-way valve and the second hydraulic control The oil circuit between the first actuator port of main control valve and the big chamber of dozer oil cylinder is arranged in check valve, first hydraulic control one-way valve It is upper and to the big cavity direction forward conduction of dozer oil cylinder；The second actuator port of main control valve is arranged in second hydraulic control one-way valve On oil circuit between the small chamber of dozer oil cylinder and to the small cavity direction forward conduction of dozer oil cylinder；First hydraulic control one-way valve it is anti- It is connected to conducting hydraulic control end with the second actuator port of main control valve, the reverse-conducting hydraulic control end of the second hydraulic control one-way valve and main control valve The first actuator port conducting.In the present invention, if main control valve have control action (main control valve be in non-middle position), main control valve and Wherein there is high pressure oil, the positive guide of hydraulic control one-way valve on the oil circuit all the way in two-way oil circuit between dozer oil cylinder It is logical, and the hydraulic control one-way valve on another oil circuit due to its hydraulic control end connects high-pressure oil passage and reverse-conducting, to realize hydraulic cylinder Big chamber and small intracavitary oil liquid one-in-and-one-out and stretch.When main control valve does not have operational motion and is in middle position, due to two liquid The hydraulic control end of control check valve is in low pressure and is in reverse blocking state (dozer oil cylinder ends to main control valve direction), therefore The big chamber of dozer oil cylinder and the oil liquid of small chamber cannot all outflow, to realize the lockup state of dozer oil cylinder.

In above-mentioned excavator dozer blade hydraulic system, the dozer oil cylinder can be one, the oil cylinder lockup valve cloth It sets on dozer oil cylinder；It is also possible to two oil cylinders in parallel, the big chamber of two oil cylinders is connected with big chamber, small chamber and small chamber It is connected, an oil cylinder lockup valve is both provided on each oil cylinder.

In above-mentioned excavator dozer blade hydraulic system, the automatically controlled end of the floating solenoid valve is connected to power supply by switch. Switch is arranged in the driver's cabin of excavator, operator is facilitated to manipulate.

In above-mentioned excavator dozer blade hydraulic system, the floating solenoid valve is two-position three-way valve.Further, described floating Check valve is provided in moving electromagnetic valve, when the floating solenoid valve be in float forbid when the third hydraulic fluid port pass through the list To valve to first hydraulic fluid port and the second hydraulic fluid port one-way conduction.

In above-mentioned excavator dozer blade hydraulic system, the floating solenoid valve be can also be by the first 2/2-way solenoid valve It being constituted with the second 2/2-way solenoid valve, a hydraulic fluid port of the first 2/2-way solenoid valve is connected to the first hydraulic fluid port, and the second two two One hydraulic fluid port of three-way electromagnetic valve is connected to the second hydraulic fluid port, and other the one of the first 2/2-way solenoid valve and the second 2/2-way solenoid valve A hydraulic fluid port is connected to after being interconnected with third hydraulic fluid port.Further, the first 2/2-way solenoid valve and the second 2/2-way electromagnetism Check valve is provided in valve, when the first 2/2-way solenoid valve and the second 2/2-way solenoid valve are in float and forbid position Shi Suoshu third hydraulic fluid port passes through the check valve to first hydraulic fluid port and the second hydraulic fluid port one-way conduction.

Compared with prior art, the present invention the present invention is arranged oil cylinder lockup valve and is floated in excavator dozer blade hydraulic system Moving electromagnetic valve realizes and is provided simultaneously with float function and lock function, meets laws and regulations and job requirements.

Detailed description of the invention

Fig. 1 is the schematic diagram of excavator dozer blade hydraulic system of the present invention.

Specific embodiment

Illustrate specific embodiment with reference to the accompanying drawing.

As shown in Figure 1, the excavator dozer blade hydraulic system in the present embodiment, including dozer oil cylinder 1, actuator port point Not Tong Guo pipeline connect with the big chamber of dozer oil cylinder and small chamber main control valve 5, connect with main control valve hydraulic control end pilot valve 4, first Pilot valve 4 and main control valve 5 are connect with fueller.

Fueller includes main pump P2, pioneer pump P1 and hydraulic oil container 6, the oil inlet of main pump P2 and pioneer pump P1 with it is hydraulic Fuel tank 6 connects, and the pumping hole of the draw oil from hydraulic oil container 6, main pump P2 is connect through check valve 8 with main control valve 5, to main control valve The pumping hole of 5 fuel feeding, pioneer pump P1 is connect by check valve 7 with pilot valve 4, to 4 fuel feeding of pilot valve.

Dozer oil cylinder 1 is made of two oil cylinders in parallel, and an oil cylinder lockup valve is both provided on each oil cylinder.Each Oil cylinder lockup valve includes the first hydraulic control one-way valve 10 and the second hydraulic control one-way valve 9.The positive oil inlet end of first hydraulic control one-way valve 10 Pass through pipeline connection, the positive oil outlet of the first hydraulic control one-way valve 10 and the big chamber of oil cylinder with the first actuator port A of main control valve 5 Connection；The positive oil inlet end of second hydraulic control one-way valve 9 and the second actuator port B of main control valve 5 pass through pipeline connection, the second hydraulic control The positive oil outlet of check valve 9 is connected to the small chamber of oil cylinder；The reverse-conducting hydraulic control end of first hydraulic control one-way valve 10 and the second liquid Control the positive oil inlet end connection of check valve 9, the reverse-conducting hydraulic control end of the second hydraulic control one-way valve 9 and the first hydraulic control one-way valve 10 Positive oil inlet end connection.

In the present embodiment, if main control valve 5 has control action (main control valve is in non-middle position), main control valve 5 and dozer Wherein there is high pressure oil all the way, such as the first actuator port A exports high pressure oil, is located at the oil in two-way oil circuit between oil cylinder 1 10 forward conduction of the first hydraulic control one-way valve of road, it is oil-filled to the big chamber of dozer oil cylinder, the second actuator port B of main control valve 5 with The conducting of fuel tank circuit, is in low pressure, but the pressure of the first hydraulic control one-way valve forward direction oil inlet end is transferred to the second hydraulic control one-way valve 9 Reverse-conducting hydraulic control end, makes 9 reverse-conducting of the second hydraulic control one-way valve, and the hydraulic oil of the small chamber of dozer oil cylinder passes through the second hydraulic control list The second actuator port B that main control valve 5 is entered to valve 9 and pipeline enters fuel tank circuit by main control valve 5, pushes away to realize Big chamber and small intracavitary oil liquid one-in-and-one-out in mamoty oil cylinder and stretch.When main control valve 5 is in middle position without operational motion, It (is pushed away since the hydraulic control end of the first hydraulic control one-way valve 10 and the second hydraulic control one-way valve 9 is in low pressure in reverse blocking state Mamoty oil cylinder ends to main control valve direction), therefore the big chamber of dozer oil cylinder and the oil liquid of small chamber cannot all outflow, to realize The lockup state of dozer oil cylinder.

There are three hydraulic fluid ports for the tool of floating solenoid valve 2, by the first 2/2-way solenoid valve 21 and the second 2/2-way solenoid valve 22 It constitutes, a hydraulic fluid port of the first 2/2-way solenoid valve 21 is connected to the first hydraulic fluid port C, a hydraulic fluid port of the second 2/2-way solenoid valve 22 It is connected to the second hydraulic fluid port D, another hydraulic fluid port of the first 2/2-way solenoid valve 21 and the second 2/2-way solenoid valve 22 is mutual It is connected to after connection with third hydraulic fluid port E.First hydraulic fluid port C is connect with the big chamber of dozer oil cylinder, the second hydraulic fluid port D and the small chamber of dozer oil cylinder Connection, third hydraulic fluid port E is connect with the fuel tank circuit in fueller, when floating solenoid valve 2 is in floating enable bit, Ye Ji One 2/2-way solenoid valve 21 is in left position, when the second 2/2-way solenoid valve 22 is in right position, the first hydraulic fluid port C, the second hydraulic fluid port D, third hydraulic fluid port E mutual conduction；When floating solenoid valve 2 be in float forbid when namely the first 2/2-way solenoid valve 21 at In right position, when the second 2/2-way solenoid valve 22 is in left position, from the first hydraulic fluid port C and the second hydraulic fluid port D to the direction third hydraulic fluid port E Oil circuit is turned off.Be provided with check valve in floating solenoid valve 2, when floating solenoid valve 2 be in float forbid when third hydraulic fluid port it is logical Check valve is crossed to the first hydraulic fluid port and the second hydraulic fluid port one-way conduction.

In the present embodiment, floating solenoid valve 2 can also be two-position three-way valve, and it is the first oil that three of them hydraulic fluid port, which respectively corresponds, Mouth, the second hydraulic fluid port, third hydraulic fluid port, two working positions respectively correspond floating and forbid position and floating enable bit.

The automatically controlled end of floating solenoid valve 2 is connected to power supply by switch 3.Switch 3 is arranged in the driver's cabin of excavator, Operator is facilitated to manipulate.

In the present embodiment, the working position of main control valve 5 can be controlled by manipulation pilot valve 4, to control dozer oil Stretching for cylinder 1, realizes the lifting of dozer.When carrying out dozer descending operation, floating solenoid valve 2, which is in float, forbids position, pushes away Mutually end between the big chamber and small chamber of mamoty oil cylinder, is only capable of the big chamber from third hydraulic fluid port E (hydraulic oil container) to dozer oil cylinder Or the small unidirectional repairing of chamber.When not carrying out lifting action control to dozer, main control valve 5 is in middle position, at this time dozer oil cylinder 1 State determined by the working position of floating solenoid valve 2.When floating solenoid valve 2 it is electric and be in floating enable bit when, dozer oil The big chamber and small chamber of cylinder 1 are interconnected by floating solenoid valve 2 and hydraulic oil container, realize dozer float function；When the electricity that floats 2 power loss of magnet valve and in float forbid when, mutually end between the big chamber and small chamber of dozer oil cylinder 1, dozer oil cylinder Big chamber and small intracavitary oil liquid cannot enter fuel tank circuit by floating solenoid valve 2, simultaneously because the presence of oil cylinder lockup valve, The big chamber of dozer oil cylinder 1 and small intracavitary oil liquid cannot leak into fuel tank circuit, therefore dozer by main control valve 5 Oil cylinder is in lockup state.

In the present embodiment, oil cylinder lockup valve and floating solenoid valve are set in excavator dozer blade hydraulic system, realized It is provided simultaneously with float function and lock function, floating solenoid valve is controlled by operator and realizes float function or lock function, Meet provisions of laws and regulations, and meets job requirements.