CN216278736U

CN216278736U - Multi-way control valve and engineering machinery

Info

Publication number: CN216278736U
Application number: CN202122979007.0U
Authority: CN
Inventors: 松本哲; 叶其团; 李会玉; 于晓晨; 桑长城
Original assignee: Suote Transmission Equipment Co Ltd
Current assignee: Suote Transmission Equipment Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-04-12
Anticipated expiration: 2031-11-30

Abstract

The utility model provides a multi-way control valve and engineering machinery, wherein the multi-way control valve comprises: the valve body is provided with a first inlet and a second inlet; the first walking switching valve core is arranged in the valve body, and the first inlet is communicated with the first walking switching valve core through a first flow passage; the second walking switching valve core is arranged in the valve body, and a second inlet is communicated with the second walking switching valve core through a second flow passage; the linear traveling switching valve core is arranged in the valve body and is positioned on the second flow channel; the functional valve cores are arranged in parallel and arranged in the valve body; and the first one-way circulation structure is arranged on the fourth flow channel. In the structure, the multi-way control valve is only provided with one valve body, the length of each flow passage is greatly shortened, the oil supply circulation pressure loss of the variable displacement pump is reduced, and the comprehensive energy efficiency of the excavator is improved. The technical scheme of the utility model overcomes the defects that the flow pressure loss of the control valve of the hydraulic excavator with the double-pump system in the prior art is large, so that the oil consumption of the excavator is high.

Description

Multi-way control valve and engineering machinery

Technical Field

The utility model relates to the technical field of hydraulic control, in particular to a multi-way control valve and engineering machinery.

Background

The hydraulic principle of a control valve used in a hydraulic excavator with a dual pump system in the prior art is shown in fig. 1, the control valve comprises two multi-way control valves, the two multi-way control valves are respectively connected with two variable pumps (PL and PR), a left walking switching valve 1 is arranged in one multi-way control valve, and a right walking switching valve 2 is arranged in the other multi-way control valve. In the multi-way control valve on the right side in fig. 1, a straight travel switching valve 3 is provided, and when the straight travel switching valve 3 is controlled to be in the right position, the hydraulic oil of the variable pump PL simultaneously flows into the left travel switching valve 1 and the travel switching valve 2, so that the excavator travels straight, and the hydraulic oil of the variable pump PR supplies oil to other actuators (such as a boom, an arm, a bucket, and the like) of the excavator.

However, in the above control valves, even when the excavator is not in a straight traveling state, the hydraulic oil discharged from the variable displacement pump PL reciprocates in the two multi-way control valves, and then flows into the multi-way control valve on the left side in fig. 1, and is supplied to each valve element. The above situation causes great pressure loss in the long passage for the oil supply of the variable displacement pump, and thus becomes one of the main obstacles for reducing the oil consumption of the excavator.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defects that the circulation pressure loss of a control valve of a hydraulic excavator with a double-pump system in the prior art is large, so that the oil consumption of the excavator is high, thereby providing a multi-way control valve and engineering machinery.

In order to solve the above problems, the present invention provides a multiplex control valve including: the valve body is provided with a first inlet and a second inlet, and the first inlet and the second inlet are respectively suitable for being connected with a first variable pump and a second variable pump; the first walking switching valve core is arranged in the valve body, and the first inlet is communicated with the first walking switching valve core through a first flow passage; the second walking switching valve core is arranged in the valve body, and a second inlet is communicated with the second walking switching valve core through a second flow passage; the linear walking switching valve core is arranged in the valve body and positioned on the second flow channel, is communicated with the first flow channel through a third flow channel and is suitable for selectively communicating the first inlet or the second inlet with the second walking switching valve core; the valve comprises a valve body, a plurality of functional valve cores and a first inlet, wherein the functional valve cores are arranged in the valve body in parallel; and the first one-way circulation structure is arranged on the fourth flow channel and is suitable for enabling the hydraulic oil to flow from the first inlet to the functional valve cores in one way or separating the fourth flow channel.

Optionally, the first unidirectional flow structure comprises: a one-way valve core; and the outlet of the logic valve core is communicated with the rear cavity of the one-way valve core through a sixth flow passage, two inlets of the logic valve core are respectively communicated with the upstream oil passage and the downstream oil passage of the one-way valve core through a seventh flow passage and an eighth flow passage, and the logic valve core is suitable for communicating the downstream oil passage of the one-way valve core with the rear cavity or selectively communicating the path with larger pressure in the upstream oil passage or the downstream oil passage of the one-way valve core with the rear cavity.

Optionally, the logic valve core includes a first direction valve and a second direction valve which are arranged in series, wherein a first outlet of the first direction valve is communicated with the rear cavity through a sixth flow passage, the eighth flow passage includes a first branch flow passage and a second branch flow passage, the first branch flow passage is communicated with the first control end of the first direction valve, the second branch flow passage is communicated with a third inlet of the first direction valve, the seventh flow passage is communicated with a fourth inlet of the second direction valve, and a second outlet of the second direction valve is communicated with a fifth inlet of the first direction valve and the second control end of the first direction valve through a ninth flow passage.

Optionally, when the second outlet and the fourth inlet of the second reversing valve are disconnected, the second outlet is communicated with the external oil tank.

Optionally, the plurality of functional spools include a plurality of: the movable arm control valve core, the bucket rod control valve core, the bucket control valve core and the standby valve core are arranged in parallel.

Optionally, the multi-way control valve further includes a second one-way flow structure, the second one-way flow structure is disposed on the fifth flow channel, and the second one-way flow structure is adapted to enable hydraulic oil to flow from the second inlet to the plurality of functional valve spools in one way.

Optionally, the multi-way control valve further comprises a rotary control valve core, and the rotary control valve core is communicated with the second inlet through a tenth flow passage.

Optionally, the multi-way control valve further comprises a first bypass spool and a second bypass spool, the first bypass spool and the second bypass spool being in communication with the first inlet and the second inlet, respectively.

Optionally, the multiplexed control valve further comprises a spill valve spool in communication with both the first inlet and the second inlet.

The utility model also provides engineering machinery comprising the multi-way control valve.

The utility model has the following advantages:

by utilizing the technical scheme of the utility model, when the excavator does not perform linear walking, the oil inlet of the first inlet supplies oil to the first walking switching valve core, the oil inlet of the second inlet supplies oil to the second walking switching valve core, and meanwhile, the first one-way circulation structure enables hydraulic oil to be communicated to the plurality of functional valve cores from the first inlet in one way, so that the oil inlets of the first inlet and the second inlet simultaneously supply oil to the plurality of functional valve cores. When the excavator travels linearly, the linear travel switching valve core is controlled to be reversed, and then the first inlet is communicated with the second travel switching valve core, so that oil fed from the first inlet supplies oil to the first travel switching valve core and the second travel switching valve core simultaneously. Simultaneously, first one-way circulation structure cuts off the fourth runner, and the oil feed of only the second import at this moment supplies oil to a plurality of function valve cores. In the structure, the multi-way control valve is only provided with one valve body, the length of each flow passage is greatly shortened, the oil supply circulation pressure loss of the variable displacement pump is reduced, and the comprehensive energy efficiency of the excavator is improved. Therefore, the technical scheme of the utility model overcomes the defects that the flow pressure loss of the control valve of the hydraulic excavator with the double-pump system in the prior art is large, so that the oil consumption of the excavator is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 shows a schematic diagram of a control valve of a prior art dual pump system hydraulic excavator;

FIG. 2 shows a hydraulic schematic of the multiplex control valve of the present invention;

FIG. 3 shows a hydraulic schematic of a first one-way flow configuration of the multiplex control valve of FIG. 2; and

fig. 4 is a schematic diagram illustrating a first one-way flow structure and a second one-way flow structure of the multiplex control valve of fig. 2.

Description of reference numerals:

1. a left travel switch valve; 2. a right travel switch valve; 3. a straight-line travel switching valve; 10. a valve body; 11. a first inlet; 12. a second inlet; 20. a first travel switch spool; 30. a first flow passage; 40. a second travel switch spool; 50. a second flow passage; 60. a linear travel switching valve element; 70. a third flow path; 80. a functional valve core; 81. a boom control spool; 82. a bucket rod control valve core; 83. a bucket control spool; 84. a spare valve core; 90. a fourth flow path; 100. a fifth flow channel; 110. a first one-way flow structure; 111. a one-way valve core; 1111. a rear cavity; 112. a logic spool; 1121. a first direction changing valve; 11211. a first outlet; 11212. a first control terminal; 11213. a third inlet; 11214. a fifth inlet; 11215. a second control terminal; 1122. a second directional control valve; 11221. a fourth inlet; 11222. a second outlet; 120. a sixth flow path; 130. a seventh flow channel; 140. an eighth flow channel; 141. a first branch flow channel; 142. a second branch flow channel; 150. a ninth flow path; 160. a second one-way flow structure; 170. a rotary control valve core; 180. a tenth flow passage; 190. a first bypass spool; 200. a second bypass spool; 210. and the overflow valve core.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 2, the multi-way control valve of the present embodiment includes a valve body 10, a first travel switching valve spool 20, a second travel switching valve spool 40, a straight travel switching valve spool 60, a plurality of functional valve spools 80 arranged in parallel, and a first one-way flow structure 110. Wherein, the valve body 10 is provided with a first inlet 11 and a second inlet 12, and the first inlet 11 and the second inlet 12 are respectively suitable for being connected with a first variable pump and a second variable pump. The first travel switch spool 20 is disposed in the valve body 10, and the first inlet port 11 communicates with the first travel switch spool 20 through the first flow passage 30. The second travel switching valve spool 40 is disposed in the valve body 10, and the second inlet 12 communicates with the second travel switching valve spool 40 through a second flow passage 50. The straight travel switching spool 60 is disposed in the valve body 10 on the second flow passage 50, and the straight travel switching spool 60 communicates with the first flow passage 30 through the third flow passage 70, the straight travel switching spool 60 being adapted to selectively communicate the first inlet port 11 or the second inlet port 12 with the second travel switching spool 40. A plurality of functional valve spools 80 arranged in parallel are disposed in the valve body 10, wherein the first inlet 11 communicates with the plurality of functional valve spools 80 through a fourth flow passage 90, and the second inlet 12 communicates with the plurality of functional valve spools 80 through a fifth flow passage 100. The first one-way flow structure 110 is disposed on the fourth flow passage 90, and the first one-way flow structure 110 is adapted to allow one-way flow of the hydraulic oil from the first inlet 11 to the plurality of functional spools 80, or to block the fourth flow passage 90.

By using the technical scheme of the embodiment, when the excavator does not perform straight-line walking, the oil inlet of the first inlet 11 supplies oil to the first walking switching valve core 20, the oil inlet of the second inlet 12 supplies oil to the second walking switching valve core 40, and meanwhile, the first one-way circulation structure 110 enables hydraulic oil to be communicated from the first inlet 11 to the plurality of functional valve cores 80 in one way, so that the oil inlets of the first inlet 11 and the second inlet 12 simultaneously supply oil to the plurality of functional valve cores 80. When the excavator travels straight, the straight travel switching valve core 60 is controlled to be reversed, and the first inlet 11 is communicated with the second travel switching valve core 40, so that the first inlet 11 is filled with oil while the first travel switching valve core 20 and the second travel switching valve core 40 are filled with oil. Meanwhile, the first one-way flow structure 110 blocks the fourth flow passage 90, and only the oil inlet of the second inlet 12 supplies oil to the plurality of functional valve spools 80 at this time. In the structure, the multi-way control valve is only provided with the valve body 10, the length of each flow passage is greatly shortened, the pressure loss of oil supply circulation of the variable displacement pump is reduced, and the comprehensive energy efficiency of the excavator is improved. Therefore, the technical scheme of the embodiment overcomes the defects that the circulation pressure loss of the control valve of the hydraulic excavator with the double-pump system in the prior art is large, and the oil consumption of the excavator is high.

Referring to fig. 2, it should be noted that, in the present embodiment, the first travel switching valve core 20 is a right travel switching valve core, and the second travel switching valve core 40 is a left travel switching valve core. Of course, the specific functions of the two can be exchanged.

Referring to fig. 2, it should be noted that, in the present embodiment, the straight travel switching valve core 60 is a two-position three-way directional valve. The two-position three-way directional valve can make the first inlet 11 communicate with the second travel switching valve core 40 through the first flow passage 30 and the third flow passage 70 by switching the right position or the left position, or the second inlet 12 communicates with the second travel switching valve core 40 through the second flow passage 50.

Further, in the present embodiment, when the construction machine needs to perform straight traveling, the straight traveling switching spool 60 is in the right position, and when the construction machine does not perform straight traveling, the straight traveling switching spool 60 is in the left position.

As shown in fig. 2 and 3, in the solution of the present embodiment, the first one-way flow structure 110 includes a one-way spool 111 and a logic spool 112. Wherein the outlet of the logic spool 112 communicates with the rear chamber 1111 of the check spool 111 through the sixth flow passage 120. The two inlets of the logic spool 112 are respectively communicated with the upstream oil path and the downstream oil path of the check spool 111 through the seventh flow path 130 and the eighth flow path 140, and the logic spool 112 is adapted to communicate the downstream oil path of the check spool 111 with the rear chamber 1111, or the logic spool 112 is adapted to selectively communicate the path of the upstream oil path or the downstream oil path of the check spool 111, which has a larger pressure, with the rear chamber 1111.

Specifically, as can be seen from fig. 2 and 3, an upstream oil passage of the check valve body 111, that is, a in the drawing, and a downstream oil passage of the check valve body 111, that is, b in the drawing.

When the logic spool 112 leads the downstream oil path b into the rear chamber 1111, the check spool 111 functions as a normal check valve, that is, when the pressure of the upstream oil path a is greater than that of the downstream oil path b, the check spool 111 is opened, and the hydraulic oil of the first inlet 11 can be led into the downstream functional spools 80. When the pressure of the upstream oil passage a is smaller than that of the downstream oil passage b, the check valve body 111 is closed, and the hydraulic oil of the first inlet 11 cannot pass therethrough.

When the logic spool 112 causes the path with the larger pressure in the upstream oil path a and the downstream oil path b to enter the rear cavity 1111, the check spool 111 is always in the closed state no matter how the pressure between the upstream oil path a and the downstream oil path b is, that is, the check spool 111 blocks the fourth flow path 90.

As shown in fig. 2-4, the logic spool 112 includes a first direction valve 1121 and a second direction valve 1122 disposed in series. The first direction valve 1121 is a two-position three-way direction valve, and the second direction valve 1122 is a two-position two-way direction valve. Further, the first outlet port 11211 of the first direction changing valve 1121 communicates with the rear chamber 1111 through the sixth flow passage 120. The eighth fluid passage 140 includes a first branch fluid passage 141 and a second branch fluid passage 142, the first branch fluid passage 141 communicating with the first control end 11212 of the first direction valve 1121, and the second branch fluid passage 142 communicating with the third inlet 11213 of the first direction valve 1121. The seventh flow passage 130 communicates with the fourth inlet port 11221 of the second direction valve 1122. The second outlet port 11222 of the second direction valve 1122 is in communication with the fifth inlet port 11214 of the first direction valve 1121 and the second control port 11215 of the first direction valve 1121 via the ninth flow passage 150.

The specific structure of the first direction changing valve 1121 and the second direction changing valve 1122 will be described below:

as shown in FIG. 3, the first directional valve 1121 is a two-position, three-way directional valve that includes two inlets and one outlet, namely, a third inlet 11213, a fifth inlet 11214, and a first outlet 11211. In fig. 3, the upper hydraulic control end of the first directional control valve 1121 is a first control end 11212, and the lower hydraulic control end of the first directional control valve 1121 is a second control end 11215. A return spring is disposed at the first control end 11212. The third inlet 11213 is in communication with the first outlet 11211 when the first directional valve 1121 is in the up position, and the fifth inlet 11214 is in communication with the first outlet 11211 when the first directional valve 1121 is in the down position.

As shown in FIG. 3, the second direction valve 1122 is a two-position, two-way direction valve that includes an inlet and an outlet, i.e., a fourth inlet 11221 and a second outlet 11222. The upper end of the second direction valve 1122 is controlled by an external signal, and the lower end of the second direction valve 1122 is provided with a return spring. When the second direction valve 1122 is in the up position, the fourth inlet port 11221 and the second outlet port 11222 are in communication, but when the second direction valve 1122 is in the down position, the fourth inlet port 11221 and the second outlet port 11222 are disconnected.

Based on the above-described configurations and connection modes of the first direction changing valve 1121 and the second direction changing valve 1122, the control mode of the logic valve spool 112 in the present embodiment is:

1. when no external control signal is provided, the second direction valve 1122 is in the down position, the second control end 11215 of the first direction valve 1121 does not control the pressure, the first control end 11212 of the first direction valve 1121 opens the pressure of the downstream oil path b, the first direction valve 1121 is maintained in the up position, and at this time, the hydraulic oil of the downstream oil path b is opened into the rear cavity 1111.

2. When the external control signal is triggered, the second direction-changing valve 1122 is at the upper position, the fifth inlet port 11214 and the second control port 11215 of the first direction-changing valve 1121 are opened to the hydraulic oil of the upstream oil path a, that is, at this time, the first control port 11212 and the second control port 11215 of the first direction-changing valve 1121 are opened to the pressures of the downstream oil path b and the upstream oil path a, respectively, so that:

when the pressure of the upstream oil path a is greater than the pressure of the downstream oil path b, the first directional control valve 1121 is in the down position, and the fifth inlet port 11214 is communicated with the first outlet port 11211, that is, the hydraulic oil of the upstream oil path a is introduced into the rear chamber 1111.

When the pressure of the upstream oil passage a is smaller than the pressure of the downstream oil passage b, the first directional valve 1121 is in the upper position, and at this time, the third inlet 11213 communicates with the first outlet 11211. That is, the hydraulic oil of the downstream oil passage b is introduced into the rear chamber 1111.

It can be seen that the first direction-changing valve 1121 and the second direction-changing valve 1122 are logically controlled by the activation or non-activation of the external signal.

As shown in fig. 3, in the solution of the present embodiment, when the second outlet port 11222 and the fourth inlet port 11221 of the second direction valve 1122 are disconnected, the second outlet port 11222 communicates with the external oil tank. Specifically, when the second direction valve 1122 is in the down position, the second outlet port 11222 is communicated with the external tank, thereby ensuring that the second control port 11215 of the first direction valve 1121 is vented to maintain the first direction valve 1121 in the up position.

As shown in fig. 2, in the solution of the present embodiment, the plurality of functional spools 80 include at least some of the following spools: boom control spool 81, arm control spool 82, bucket control spool 83, and backup spool 84.

Of course, the function spool 80 may include other types of control spools depending on the type of construction machine.

As shown in fig. 2, in the solution of the present embodiment, the multi-way control valve further includes a second one-way flow structure 160, the second one-way flow structure 160 is disposed on the fifth flow channel 100, and the second one-way flow structure 160 is adapted to enable one-way flow of the hydraulic oil from the second inlet 12 to the plurality of functional valve spools 80. The second one-way flow structure 160 is a one-way valve, and the second one-way flow structure 160 is disposed in parallel with the first one-way flow structure 110.

As shown in fig. 2, in the solution of the present embodiment, the multi-way control valve further includes a rotary control spool 170, and the rotary control spool 170 communicates with the second inlet 12 through a tenth flow passage 180. The rotary control spool 170 is provided in parallel with the plurality of function spools 80 described above.

As shown in fig. 2, in the solution of the present embodiment, the multi-way control valve further includes a first bypass valve spool 190 and a second bypass valve spool 200, and the first bypass valve spool 190 and the second bypass valve spool 200 are respectively communicated with the first inlet 11 and the second inlet 12. Specifically, the first bypass valve spool 190 and the second bypass valve spool 200 are both two-position, two-way directional valves. When the excavator does not perform any action, the first bypass valve core 190 and the second bypass valve core 200 are respectively suitable for relieving the pressure of the first inlet 11 and the second inlet 12, so that the hydraulic oil of the two variable displacement pumps flows back to the oil tank through the first bypass valve core 190 and the second bypass valve core 200.

As shown in fig. 2, in the solution of the present embodiment, the multi-way control valve further includes a relief valve core 210, and the relief valve core 210 is communicated with both the first inlet 11 and the second inlet. Specifically, the spill valve cartridge 210 is adapted to regulate the maximum operating pressure of the continuous variable displacement pump.

The embodiment also provides the engineering machinery comprising the multi-way control valve. Preferably, the working machine is an excavator, but of course, other working machines, such as a crane, a pump truck, etc., may employ the above-mentioned multi-way control valve.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. A multiplex control valve, comprising:

the variable displacement pump comprises a valve body (10), wherein a first inlet (11) and a second inlet (12) are formed in the valve body (10), and the first inlet (11) and the second inlet (12) are respectively suitable for being connected with a first variable displacement pump and a second variable displacement pump;

the first travel switching valve core (20) is arranged in the valve body (10), and the first inlet (11) is communicated with the first travel switching valve core (20) through a first flow passage (30);

the second walking switching valve core (40) is arranged in the valve body (10), and the second inlet (12) is communicated with the second walking switching valve core (40) through a second flow passage (50);

the linear traveling switching valve core (60) is arranged in the valve body (10) and positioned on the second flow passage (50), the linear traveling switching valve core (60) is communicated with the first flow passage (30) through a third flow passage (70), and the linear traveling switching valve core (60) is suitable for selectively communicating the first inlet (11) or the second inlet (12) with the second traveling switching valve core (40);

the valve body (10) is provided with a plurality of functional valve cores (80) which are arranged in parallel, wherein the first inlet (11) is communicated with the functional valve cores (80) through a fourth flow passage (90), and the second inlet (12) is communicated with the functional valve cores (80) through a fifth flow passage (100);

and the first one-way flow structure (110) is arranged on the fourth flow channel (90), and the first one-way flow structure (110) is suitable for enabling hydraulic oil to flow from the first inlet (11) to the functional valve cores (80) in one way or separating the fourth flow channel (90).

2. The multiplexed control valve of claim 1, wherein the first one-way flow structure (110) comprises:

a one-way valve element (111);

and the outlet of the logic valve core (112) is communicated with the rear cavity (1111) of the one-way valve core (111) through a sixth flow passage (120), two inlets of the logic valve core (112) are respectively communicated with the upstream oil passage and the downstream oil passage of the one-way valve core (111) through a seventh flow passage (130) and an eighth flow passage (140), the logic valve core (112) is suitable for enabling the downstream oil passage of the one-way valve core (111) to be communicated with the rear cavity (1111), or the logic valve core (112) is suitable for selectively enabling the one way with larger pressure in the upstream oil passage or the downstream oil passage of the one-way valve core (111) to be communicated with the rear cavity (1111).

3. The multiplexed control valve of claim 2, wherein the logic spool (112) includes a first direction valve (1121) and a second direction valve (1122) disposed in series, wherein,

the first outlet port (11211) of the first direction changing valve (1121) communicates with the rear chamber (1111) through the sixth flow passage (120), the eighth flow passage (140) includes a first branch flow passage (141) and a second branch flow passage (142), the first branch flow passage (141) communicates with the first control end (11212) of the first direction changing valve (1121), the second branch flow passage (142) communicates with the third inlet port (11213) of the first direction changing valve (1121),

the seventh flow passage (130) communicates with a fourth inlet (11221) of the second direction valve (1122),

the second outlet (11222) of the second direction valve (1122) is in communication with the fifth inlet (11214) of the first direction valve (1121) and the second control end (11215) of the first direction valve (1121) via a ninth flow passage (150).

4. The multiplex control valve as recited in claim 3, wherein when the second outlet port (11222) and the fourth inlet port (11221) of the second direction valve (1122) are disconnected, the second outlet port (11222) communicates with an external tank.

5. The multiplex control valve according to any one of claims 1 to 4, wherein said plurality of said functional spools (80) comprises a plurality of:

a movable arm control valve core (81), an arm control valve core (82), a bucket control valve core (83) and a standby valve core (84),

the movable arm control valve core (81), the arm control valve core (82), the bucket control valve core (83) and the standby valve core (84) are arranged in parallel.

6. The multiple control valve according to any one of claims 1 to 4, further comprising a second one-way flow structure (160), the second one-way flow structure (160) being provided on the fifth flow passage (100), the second one-way flow structure (160) being adapted to make one-way flow of hydraulic oil from the second inlet (12) to the plurality of functional spools (80).

7. The multiplex control valve of any one of claims 1 to 4 further comprising a rotary control spool (170), said rotary control spool (170) communicating with said second inlet (12) through a tenth flow passage (180).

8. The multiplex control valve according to any one of claims 1 to 4, further comprising a first bypass spool (190) and a second bypass spool (200), said first bypass spool (190) and said second bypass spool (200) communicating with said first inlet port (11) and said second inlet port (12), respectively.

9. The multiplex control valve of any one of claims 1 to 4, further comprising a spill spool (210), said spill spool (210) communicating with both said first inlet (11) and said second inlet.

10. A working machine comprising a multiplex control valve according to any one of claims 1 to 9.