WO2023097882A1

WO2023097882A1 - Pilot control system, integrated valve block and operation machine

Info

Publication number: WO2023097882A1
Application number: PCT/CN2022/073806
Authority: WO
Inventors: 廖小宁; 张政委; 梁凯
Original assignee: 湖南三一中型起重机械有限公司
Priority date: 2021-11-30
Filing date: 2022-01-25
Publication date: 2023-06-08
Also published as: CN114198354A; CN114198354B

Abstract

Provided in the present invention are a pilot control system, an integrated valve block and an operation machine. The present invention relates to the field of hydraulic control. The pilot control system comprises a decompression overflow valve and a first electromagnetic reversing valve, wherein an oil inlet of the decompression overflow valve is connected to a main path pressure oil port, an oil outlet of the decompression overflow valve is connected to an oil inlet of the first electromagnetic reversing valve, and an oil outlet of the first electromagnetic reversing valve is in communication with a main valve pilot oil port. By means of the pilot control system provided in the present invention, main path pressure oil is decompressed by means of the decompression overflow valve and then serves as pilot oil of the pilot control system, and the first electromagnetic reversing valve is arranged to control a main valve pilot port, so as to make a pilot oil path controllable, and a pilot oil pump in the prior art is replaced by decompressing the main path pressure oil by means of the decompression overflow valve, thereby reducing the cost.

Description

Pilot control systems, integrated valve blocks and working machinery

technical field

The invention relates to the technical field of hydraulic control, in particular to a pilot control system, an integrated valve block and an operating machine.

Background technique

In the field of construction machinery, there are many types of control methods for hydraulic systems. For example: mechanical linkage operation, hydraulic pilot control, electromagnetic-hydraulic pilot control, etc. The mechanical linkage operation appeared first and has high reliability, but the operator is prone to fatigue when working for a long time. Hydraulic pilot control can reduce working intensity and improve operating comfort, but there are also problems such as high failure rate compared with mechanical operation, and excessive oil temperature in the pilot line. Using a solenoid valve as a pilot valve can realize electronic control and intelligent control, but the solenoid valve has higher requirements on the working environment and its reliability is lower than other operating methods.

For example, a decompression valve is provided in the tail joint valve body of the multi-way valve, the inlet of the decompression valve is connected with the main oil supply oil circuit, and the outlet of the decompression valve is connected with the main reversing valve in at least one working joint valve body. The pilot control oil circuit is connected to provide pilot control oil to the main reversing valve in each working joint valve body, but the pilot oil circuit cannot be controlled.

Contents of the invention

The invention provides a pilot control system, an integrated valve block and a working machine, which are used to solve the defect that the pilot control system in the prior art cannot control the pilot oil circuit by using the main oil circuit, and realize the pressure oil of the main circuit through decompression. After the overflow is used as the control oil of the pilot oil circuit, it controls the pilot port of the main valve through the first electromagnetic reversing valve.

The present invention provides a pilot control system, comprising: a pressure relief valve and a first electromagnetic reversing valve, the oil inlet of the pressure relief valve is connected to the pressure oil port of the main road, and the pressure relief valve The oil outlet is connected with the oil inlet of the first electromagnetic reversing valve,

Wherein, the oil outlet of the first electromagnetic reversing valve communicates with the pilot oil port of the main valve.

According to the pilot control system provided by the present invention, it also includes a second electromagnetic reversing valve, the oil inlet of the second electromagnetic reversing valve is connected between the oil outlet of the one-way valve and the pressure relief valve. The oil outlet is connected, and the oil outlet of the second electromagnetic reversing valve communicates with the brake oil port.

According to the pilot control system provided by the present invention, it also includes a one-way valve and an accumulator, the oil inlet of the one-way valve is connected with the pressure relief valve, and the oil outlet of the one-way valve is connected with the accumulator respectively. The energy device, the oil inlet of the first electromagnetic reversing valve and the oil inlet of the second electromagnetic reversing valve are connected,

Wherein, both the first electromagnetic reversing valve and the second electromagnetic reversing valve are connected to the accumulator.

According to the pilot control system provided by the present invention, the pressure relief valve includes a pressure relief valve and a first relief valve, the oil inlet of the pressure relief valve is connected to the pressure oil port of the main circuit, and the pressure relief valve The oil outlet of the valve is respectively connected with the oil inlet of the check valve and the oil inlet of the first relief valve,

Wherein, the oil outlet of the first overflow valve is connected with the pressure relief oil port of the main circuit.

According to the pilot control system provided by the present invention, both the first electromagnetic reversing valve and the second electromagnetic reversing valve include an unloading port, and the unloading port is connected to the pressure relief oil port of the main circuit.

According to the pilot control system provided by the present invention, both the first electromagnetic reversing valve and the second electromagnetic reversing valve include a first working position and a second working position,

Wherein, in the state of the first working position, the oil inlets of the first electromagnetic reversing valve and the second electromagnetic reversing valve are connected with the oil inlets of the first electromagnetic reversing valve and the second electromagnetic reversing valve The oil outlet is connected, and the unloading ports of the first electromagnetic reversing valve and the second electromagnetic reversing valve are closed; in the state of the second working position, the first electromagnetic reversing valve and the second electromagnetic reversing valve The oil inlet of the valve is closed, and the oil outlets of the first electromagnetic reversing valve and the second electromagnetic reversing valve communicate with the unloading ports of the first electromagnetic reversing valve and the second electromagnetic reversing valve .

The present invention also provides an integrated valve block, including the pilot oil port of the first main valve, the pilot oil port of the second main valve, the accumulator oil port, the main road pressure oil port, the main road pressure relief oil port and the main valve working couplet,

Wherein, the pressure oil port of the main road is respectively connected with the oil inlet port of the pressure relief valve and the oil inlet port of the working coupling of the main valve, and the oil outlet port of the pressure relief valve is connected with the one-way valve, The one-way valve is connected to the oil port of the accumulator;

The oil inlet of the first electromagnetic reversing valve is connected to the oil path between the check valve and the oil port of the accumulator, and the oil outlet of the first electromagnetic reversing valve is connected to the pilot oil of the first main valve. The port is connected to the pilot oil port of the second main valve, and the unloading port of the first electromagnetic reversing valve and the unloading port of the working coupling of the main valve are connected to the pressure relief port of the main circuit.

According to the integrated valve block provided by the present invention, it also includes a brake oil port and a second electromagnetic reversing valve, the oil outlet of the second electromagnetic reversing valve is connected to the brake oil port, and the second electromagnetic reversing valve The oil inlet of the directional valve is connected to the oil path between the one-way valve and the oil port of the accumulator, and the unloading port of the second electromagnetic directional valve is connected to the pressure relief oil port of the main circuit.

According to the integrated valve block provided by the present invention, it also includes a second relief valve, the oil inlet of the second relief valve is connected to the pressure oil port of the main line, and the oil outlet of the second relief valve is connected to the The main valve is connected in working couplet.

The present invention also provides a work machine, including the above-mentioned pilot control system; or,

The working machine includes the above-mentioned integrated valve block.

In the pilot control system provided by the present invention, the pressure oil in the main circuit is decompressed through the pressure relief valve as the pilot oil of the pilot control system, and the first electromagnetic reversing valve is set to control the pilot port of the main valve to realize the pilot oil The controllability of the road is improved, and the pressure oil of the main road is decompressed through the pressure relief valve to replace the pilot oil pump of the prior art, so as to reduce the cost.

Further, in the integrated valve block and the working machine provided by the present invention, since the above-mentioned pilot control system is provided, it also has the above-mentioned various advantages.

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are the present invention. For some embodiments of the invention, those skilled in the art can also obtain other drawings based on these drawings without creative effort.

Fig. 1 is the hydraulic principle diagram of pilot control system provided by the present invention;

Fig. 2 is a schematic hydraulic diagram of the integrated valve block provided by the present invention.

100: pressure relief valve; 110: main pressure port; 120: main pressure relief port; 101: pressure relief valve; 102: first relief valve; 103: third oil inlet; 104: first Three oil outlets; 105: pilot port; 106: fourth oil inlet; 107: fourth oil outlet; 200: check valve; 300: accumulator; 301: accumulator oil port; 400: first Electromagnetic directional valve; 401: first oil inlet; 402: first oil outlet; 410: second electromagnetic directional valve; 403: first unloading port; 411: second oil inlet; 420: main valve pilot Oil port; 412: second oil outlet; 413: second unloading port; 421: first main valve pilot oil port; 500: main valve working joint; 501: second relief valve; 422: second main valve pilot Oil port; 414: brake oil port; 502: feedback port.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top" ", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying The devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation and therefore should not be construed as limiting the embodiments of the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrated connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present invention in specific situations.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Embodiments of the present invention will be described below with reference to FIG. 1 to FIG. 2 . It should be understood that the following descriptions are only exemplary embodiments of the present invention, and do not limit the present invention.

As shown in Figure 1, the present invention provides a pilot control system, including: a pressure relief valve 100 and a first electromagnetic reversing valve 400, the oil inlet of the pressure relief valve 100 and the main pressure oil port 110 The oil outlet of the decompression and relief valve 100 is connected with the oil inlet of the first electromagnetic reversing valve 400 , wherein the oil outlet of the first electromagnetic reversing valve 400 communicates with the pilot oil port 420 of the main valve.

In one embodiment of the present invention, the pilot control system further includes a one-way valve 200 and an accumulator 300, the oil inlet of the one-way valve 200 is connected with the pressure relief valve 100, and the oil outlets of the one-way valve 200 are respectively It is connected with the accumulator 300 and the oil inlet of the first electromagnetic reversing valve 400 , wherein the first electromagnetic reversing valve 400 is connected with the accumulator 300 .

Specifically, the main road pressure oil entering from the main road pressure oil port 110 enters the decompression and relief valve 100 for decompression, and then opens the check valve 200 to fill the accumulator 300 with liquid, and the first solenoid Reversing valve 400 supplies oil. During actual use, the accumulator 300 is first filled with liquid, and when the accumulator 300 reaches a limited pressure, the oil re-entered from the one-way valve 200 is used to supply oil to the first electromagnetic reversing valve 400 . Among them, the one-way valve 200 prevents the oil from flowing back, and the decompression and relief valve 100 plays the role of decompression and relief, so as to stabilize the pressure of the pilot control system and limit the pressure to avoid damage to the hydraulic components.

Wherein, when the first electromagnetic reversing valve 400 is de-energized, the first electromagnetic reversing valve 400 does not receive oil, and the main valve pilot oil port 420 connected to the oil outlet of the first electromagnetic reversing valve 400 performs unloading. When the first electromagnetic reversing valve 400 is energized, the oil entering from the check valve 200 enters the oil inlet of the first electromagnetic reversing valve 400 and enters the pilot oil port 420 of the main valve. handle to switch. During the switching process of the handle, oil pressure fluctuations will be generated, and the accumulator 300 can absorb pressure shocks for the generated oil pressure fluctuations. When the oil pressure entering from the one-way valve 200 does not reach the pressure required by the first electromagnetic reversing valve 400, the accumulator 300 automatically replenishes fluid and pressure.

For the pilot control system of the present invention, the oil source is obtained directly from the main road, and after decompression, it enters the pilot control system for pilot control, and the accumulator 300 is used to replace the pilot pump that provides pressure oil to the pilot control system alone. cut costs.

Continuing to refer to FIG. 1 , in an optional embodiment of the present invention, the pilot control system further includes a second electromagnetic reversing valve 410 , the oil inlet of the second electromagnetic reversing valve 410 is connected to the oil outlet of the one-way valve 200 On the oil circuit connected to the accumulator 300 , the oil outlet of the second electromagnetic reversing valve 410 communicates with the brake oil port 414 . That is to say, the second electromagnetic reversing valve 410 is used to control the switch of the brake oil port 414 so as to control the opening and closing of the braking device.

Further, the oil entering from the one-way valve 200 can enter the second electromagnetic reversing valve 410, and when the second electromagnetic reversing valve 410 is de-energized, the second electromagnetic reversing valve 410 does not enter the oil, and the second electromagnetic reversing valve 410 does not enter the oil. The oil outlet of the electromagnetic reversing valve 410 is connected to the brake oil port 414 for unloading. When the second electromagnetic reversing valve 410 is energized, the oil entering from the check valve 200 enters the oil inlet of the second electromagnetic reversing valve 410, thereby entering the brake oil port 414, and the brake device is activated. control. During the switching process of the brake device being turned on and off, oil pressure fluctuations will be generated, and the accumulator 300 can absorb pressure shocks for the generated oil pressure fluctuations.

In addition, in the state where the pressure of the oil entering from the one-way valve 200 is not enough, the accumulator 300 can replenish the oil inlet port of the second electromagnetic reversing valve 410 to supplement the pressure. For example, when the first electromagnetic reversing valve 400 and the second electromagnetic reversing valve 410 are energized at the same time, the oil pressure entering from the check valve 200 may not be enough. The electromagnetic reversing valve 400 and the second electromagnetic reversing valve 410 perform liquid replenishment.

In addition, when the first electromagnetic reversing valve 400 and the second electromagnetic reversing valve 410 switch between energized and de-energized states individually or simultaneously, it may also cause fluctuations in the oil pressure of the entire pilot control system; at this time, the accumulator The 300 can absorb energy for the switching process of the first electromagnetic reversing valve 400 and the second electromagnetic reversing valve 410 being powered on and off.

Continuing to refer to FIG. 1 , in an alternative embodiment of the present invention, both the first electromagnetic reversing valve 400 and the second electromagnetic reversing valve 410 include an unloading port, and the unloading port is connected to the main pressure relief oil port 120 .

Specifically, in another optional embodiment of the present invention, both the first electromagnetic reversing valve 400 and the second electromagnetic reversing valve 410 include a first working position and a second working position. That is to say, the first electromagnetic reversing valve 400 and the second electromagnetic reversing valve 410 can use the same electromagnetic reversing valve. Wherein, the first electromagnetic reversing valve 400 includes a first oil inlet 401, a first oil outlet 402 and a first unloading port 403; the second electromagnetic reversing valve 410 includes a second oil inlet 411, a second oil outlet 412 and the second unloading port 413.

Wherein, in the first working position state, for the first electromagnetic reversing valve 400 , the first electromagnetic reversing valve 400 is energized, and the pilot oil port of the main valve communicates with the first oil inlet 401 . That is to say, the first oil inlet 401 communicates with the first oil outlet 402, and the first unloading port 403 is blocked; for the second electromagnetic reversing valve 410, the second electromagnetic reversing valve 410 is energized, braking The oil port 414 communicates with the second oil inlet 411 . That is to say, the second oil inlet 411 communicates with the second oil outlet 412 , and the second unloading port 413 is blocked. The first oil inlet 401 is connected with the oil outlet of the one-way valve 200 and the accumulator 300 at the same time. The second oil inlet 411 is connected with the oil outlet of the one-way valve 200 and the accumulator 300 at the same time.

In the state of the second working position, for the first electromagnetic reversing valve 400, the first electromagnetic reversing valve 400 is de-energized, the first unloading port 403 communicates with the first oil outlet 402, and the pilot oil port of the main valve is Unloading, the first oil inlet 401 is blocked; for the second electromagnetic reversing valve 410, the second electromagnetic reversing valve 410 is de-energized, the second unloading port 413 communicates with the second oil outlet 412, and the brake The oil port 414 is unloaded, and the second oil inlet 411 is blocked.

Of course, it should be understood that the first working positions of the first electromagnetic reversing valve 400 and the second electromagnetic reversing valve 410 can work simultaneously or independently.

Further, in another embodiment of the present invention, the pressure relief valve 100 includes a pressure relief valve 101 and a first relief valve 102, the oil inlet of the pressure relief valve 101 is connected to the main pressure oil port 110, and the relief valve 101 The oil outlet of the pressure valve 101 is respectively connected with the oil inlet of the check valve 200 and the oil inlet of the first relief valve 102, wherein the oil outlet of the first relief valve 102 is connected with the main pressure relief oil port 120 connect.

In other words, the decompression relief valve 100 decompresses and relieves the pilot oil circuit by using the decompression valve 101 and the first relief valve 102 . The decompression valve 101 decompresses the high-pressure oil entering from the main pressure oil port 110 , and the first relief valve 102 limits the pressure of the entire pilot control system and notifies the control of the pressure of the accumulator 300 . For example, the oil entering the pilot control system first enters the accumulator 300 for charging, and the first overflow valve 102 limits the accumulator pressure of the accumulator 300. When the pressure in the accumulator 300 reaches the first overflow After the overflow valve 102 presets the pressure, the accumulator 300 will no longer be charged, and overflow protection will be performed through the first overflow valve 102 .

In addition, in an optional embodiment of the present invention, the unloading port of the pressure reducing valve 101 is connected with the pressure relief oil port 120 of the main circuit.

Specifically, the pressure reducing valve 101 includes a third oil inlet 103 , a third oil outlet 104 and a pilot port 105 , and the first relief valve 102 includes a fourth oil inlet 106 and a fourth oil outlet 107 . The third oil inlet 103 is connected with the main road pressure oil port 110 . The fourth oil inlet 106 is connected to the oil inlet of the check valve 200, the third oil outlet 104 is connected to the oil inlet of the check valve 200 and the fourth oil inlet 106 at the same time, the pilot port 105 is connected to the main pressure relief oil port 120 , wherein the fourth oil outlet 107 is connected to the main pressure relief oil port 120 .

As shown in Figure 2, the present invention also provides an integrated valve block, including the first main valve pilot oil port 421, the second main valve pilot oil port 422, the accumulator oil port 301, the main road pressure oil port 110, Main road pressure relief oil port 120 and main valve working joint 500. For the working joint 500 of the main valve in the embodiment of the present invention, for example, this embodiment adopts a multi-way valve, including a first valve body, a tail valve body, and a valve body arranged between the first valve body and the tail valve body. At least one main valve working joint 500 valve body. In this embodiment, the pilot control system will have the first main valve pilot oil port 421, the second main valve pilot oil port 422, the accumulator oil port 301, the main road pressure oil port 110, and the main road pressure relief oil port 120 It is integrated on the working joint 500 of the main valve to form an integrated valve block. A main valve working unit 500 realizes the pilot oil circuit control function, reduces pipelines and reduces costs.

Wherein, the main road pressure oil port 110 is respectively connected with the oil inlet of the decompression and relief valve 100 and the oil inlet of the main valve working union 500, and the oil outlet of the decompression and relief valve 100 is connected with the one-way valve 200. The pilot valve 200 is connected to the accumulator oil port 301; that is to say, the main road oil pump supplies oil to the main valve working joint 500 and the pilot control system through the main road pressure oil port 110, and a channel can be opened inside the integrated valve block to make the main road The road pressure oil port 110, the oil inlet port of the decompression relief valve 100 and the oil inlet port P of the working joint 500 of the main valve are connected. Wherein, the accumulator oil port 301 is used to connect the accumulator 300 to replenish oil and absorb energy for the pilot control system.

In addition, the pilot control system controls the pilot oil port 421 of the first main valve and the pilot oil port 422 of the second main valve through the first electromagnetic reversing valve 400 . The first oil inlet 401 of the first electromagnetic reversing valve 400 is connected on the oil path between the check valve 200 and the accumulator oil port 301, in other words, the first oil inlet 401, the check valve 200 and the accumulator oil port Passages are set between 301 so that the three communicate with each other.

The first oil outlet 402 of the first electromagnetic reversing valve 400 is connected with the pilot oil port 421 of the first main valve and the pilot oil port 422 of the second main valve, the first unloading port 403 of the first electromagnetic reversing valve 400, the main valve The third unloading port T of the working union 500 is connected with the pressure relief oil port 120 of the main circuit. In the same way, the above connection relationships can be connected with each other by opening channels on the integrated valve block, thereby saving pipelines.

In another optional embodiment of the present invention, in order to realize the control of the turning brake of the vehicle, the integrated valve block also includes a brake oil port 414 and a second electromagnetic reversing valve 410, the second electromagnetic reversing valve 410 The second oil outlet 412 is connected to the brake oil port 414, and the second oil inlet 411 of the second electromagnetic reversing valve 410 is connected to the oil path between the check valve 200 and the accumulator oil port 301, in other words, the first oil inlet The oil port 401 , the second oil inlet port 411 , the one-way valve 200 and the accumulator oil port 301 communicate with each other through channels. The second unloading port 413 of the second electromagnetic reversing valve 410 is connected to the main pressure relief oil port 120 .

And, in the embodiment of the invention, the decompression and relief valve 100 may include a decompression valve 101 and a first relief valve 102, the third oil outlet 104 of the decompression valve 101, the check valve 200, the first relief valve Channels are opened between the fourth oil inlets 106 of the flow valve 102 to communicate with each other. The first unloading port 403, the second unloading port 413, the pilot port of the pressure reducing valve 101, the fourth oil outlet 107 of the first relief valve 102, and the unloading port of the main valve working union 500 are all connected to the main road pressure relief port. 120 offers channel to communicate and realize unloading.

In addition, a feedback channel is set up on the integrated valve block, one end of the feedback channel is connected to the main valve working joint 500, and the other end is connected to the feedback port 502 of the integrated valve block, wherein the feedback port 502 is connected to the oil pump to realize valve control.

Continuing to refer to FIG. 2 , in some optional embodiments of the present invention, the integrated valve block further includes a second overflow valve 501 , the oil inlet of the second overflow valve 501 is connected to the main pressure oil port 110 , and the second overflow valve The oil outlet of the flow valve 501 is connected with the working union 500 of the main valve. That is to say, there are channels communicated with each other between the main pressure oil port 110 , the oil inlet of the pressure reducing valve 101 , and the oil inlet of the second relief valve 501 . The second relief valve 501 protects the maximum pressure that limits the working section 500 of the main valve.

The present invention also provides a work machine, the pilot control system of the above embodiment; or,

An operating machine includes the integrated valve block of the above embodiment.

Wherein, the operating machine may be a crane, a concrete pump truck, or the like.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

A pilot control system, characterized in that it includes: a pressure relief valve and a first electromagnetic reversing valve, the oil inlet of the pressure relief valve is connected to the pressure oil port of the main road, and the pressure relief valve The oil outlet of the valve is connected with the oil inlet of the first electromagnetic reversing valve,

Wherein, the oil outlet of the first electromagnetic reversing valve communicates with the pilot oil port of the main valve.
The pilot control system according to claim 1, further comprising a second electromagnetic reversing valve, the oil inlet of the second electromagnetic reversing valve is connected with the oil outlet of the pressure relief valve, The oil outlet of the second electromagnetic reversing valve communicates with the brake oil port.
The pilot control system according to claim 2, further comprising a one-way valve and an accumulator, the oil inlet of the one-way valve is connected with the pressure relief valve, and the oil outlet of the one-way valve The ports are respectively connected with the accumulator, the oil inlet of the first electromagnetic reversing valve and the oil inlet of the second electromagnetic reversing valve,

Wherein, both the first electromagnetic reversing valve and the second electromagnetic reversing valve are connected to the accumulator.
The pilot control system according to claim 3, wherein the pressure relief valve comprises a pressure relief valve and a first relief valve, and the oil inlet of the pressure relief valve is connected to the main pressure oil port connected, the oil outlet of the pressure reducing valve is respectively connected with the oil inlet of the check valve and the oil inlet of the first relief valve,

Wherein, the oil outlet of the first overflow valve is connected with the pressure relief oil port of the main circuit.
The pilot control system according to claim 2, wherein the first electromagnetic reversing valve and the second electromagnetic reversing valve both include an unloading port, and the unloading port is connected to a main circuit pressure relief oil port.
The pilot control system according to claim 5, wherein the first electromagnetic reversing valve and the second electromagnetic reversing valve both include a first working position and a second working position,

Wherein, in the state of the first working position, the oil inlets of the first electromagnetic reversing valve and the second electromagnetic reversing valve are connected with the oil inlets of the first electromagnetic reversing valve and the second electromagnetic reversing valve The oil outlet is connected, and the unloading ports of the first electromagnetic reversing valve and the second electromagnetic reversing valve are closed; in the state of the second working position, the first electromagnetic reversing valve and the second electromagnetic reversing valve The oil inlet of the valve is closed, and the oil outlets of the first electromagnetic reversing valve and the second electromagnetic reversing valve communicate with the unloading ports of the first electromagnetic reversing valve and the second electromagnetic reversing valve .
An integrated valve block, characterized in that it includes a first main valve pilot oil port, a second main valve pilot oil port, an accumulator oil port, a main road pressure oil port, a main road pressure relief oil port and a main valve working coupling ,

Wherein, the pressure oil port of the main road is respectively connected with the oil inlet port of the pressure relief valve and the oil inlet port of the working coupling of the main valve, and the oil outlet port of the pressure relief valve is connected with the one-way valve, The one-way valve is connected to the oil port of the accumulator;

The oil inlet of the first electromagnetic reversing valve is connected to the oil path between the check valve and the oil port of the accumulator, and the oil outlet of the first electromagnetic reversing valve is connected to the pilot oil of the first main valve. The port is connected to the pilot oil port of the second main valve, and the unloading port of the first electromagnetic reversing valve and the unloading port of the working coupling of the main valve are connected to the pressure relief port of the main circuit.
The integrated valve block according to claim 7, further comprising a brake oil port and a second electromagnetic reversing valve, the oil outlet of the second electromagnetic reversing valve is connected to the brake oil port, The oil inlet port of the second electromagnetic reversing valve is connected to the oil path between the check valve and the oil port of the accumulator, and the unloading port of the second electromagnetic reversing valve is connected to the pressure relief oil of the main circuit. port connection.
The integrated valve block according to claim 7, further comprising a second relief valve, the oil inlet of the second relief valve is connected to the pressure oil port of the main circuit, and the second relief valve The oil outlet of the valve is connected with the working joint of the main valve.
A working machine, characterized by comprising the pilot control system according to any one of claims 1 to 6; or,

The working machine comprises the integrated valve block according to any one of claims 7-9.