An electro-hydraulic multi-way valve integrated with slewing control and a crane

Abstract

The present invention discloses an electronically controlled multi-way valve integrated with slewing control and a crane. The electronically controlled multi-way valve includes: a first stage, a telescopic working stage, a luffing working stage, an LS working stage, a auxiliary hoist working stage, a main hoist working stage, a slewing working stage, a tail stage, a pilot oil circuit, a system return oil circuit, a control oil circuit, a load sensing oil circuit, and a main oil circuit. Among them, the above-mentioned multiple working stages are connected in parallel through the above-mentioned multiple oil circuits. The electronically controlled multi-way valve is further provided with a first main oil supply port, a second main oil supply port, a third oil supply port, and a first return oil port. Thus, the electronically controlled multi-way valve integrates the control oil circuit, the return oil and the oil replenishing oil circuit, can provide pilot control oil for the actions of each mechanism, saves the auxiliary pump, the oil replenishing pump and simplifies the control pipeline. At the same time, the electronically controlled multi-way valve integrates the electro-hydraulic proportional control valve group, the buffer valve group and the free slewing valve group of the slewing mechanism into one body, which can greatly simplify the pipeline layout of the slewing control, save space and make the structure more compact.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and particularly to an electro-hydraulic multi-way valve with integrated slewing control and a crane. Background Art

[0002] For medium and small tonnage cranes, a load sensing system controlled by a load sensing pump + load sensing valve is mostly adopted at present. The load sensing valve mostly adopts post-valve compensation and integrates four working connections, namely telescopic, luffing up and down, main hoist rope winding and unwinding, and auxiliary hoist rope winding and unwinding. Some multi-way valves integrate additional functions such as motor brake valves and telescopic integrated valves.

[0003] Since the slewing is supplied with oil separately by a gear pump, the slewing mechanism has separate control valves, slewing buffer valves, and free slewing valves for control, and a dedicated make-up oil pump is required to supply oil for the hoisting operation. However, this method has its technical defects: the hydraulic system is complex, the integration degree is low, the occupied space is large, the types of valve groups are numerous, the pipeline connections are messy, and the economic cost is high. In this regard, the control oil circuit generally sets up an independent auxiliary pump to provide control oil. In most cases, the crane is in standby operation, and at this time, the auxiliary pump is not required for adjustment and control. However, if the auxiliary pump runs all the time, it will inevitably cause energy loss, and adding an auxiliary pump will also increase the economic cost. Summary of the Invention

[0004] To solve some or all of the above-mentioned technical problems existing in the prior art, the present invention provides an electro-hydraulic multi-way valve with integrated slewing control and a crane.

[0005] The technical solution of the present invention is as follows:

[0006] According to a first aspect of the present invention, there is provided an electro-hydraulic multi-way valve with integrated slewing control, the electro-hydraulic multi-way valve comprising: a first connection, a telescopic working connection, a luffing working connection, an LS working connection, an auxiliary hoist working connection, a main hoist working connection, a slewing working connection, a tail connection, a pilot oil circuit, a system return oil circuit, a control oil circuit, a load sensing oil circuit, and a main oil circuit. Among them, the first connection, the telescopic working connection, the luffing working connection, the LS working connection, the auxiliary hoist working connection, the main hoist working connection, the slewing working connection, and the tail connection are connected in parallel through the pilot oil circuit, the system return oil circuit, the control oil circuit, the load sensing oil circuit, and the main oil circuit. The electro-hydraulic multi-way valve is further provided with a first main oil supply port, a second main oil supply port, a third oil supply port, and a first oil return port. The first main oil supply port and the first oil return port are arranged on the first connection, the second main oil supply port is arranged on the tail connection, and the third oil supply port is arranged on the slewing working connection.

[0007] Optionally, the first stage includes: a pressure reducing valve, a safety valve, an accumulator, and a first check valve. Among them, the first main oil supply port is connected to the pilot oil circuit through the pressure reducing valve to provide pilot control oil for the pilot oil circuit. The system return oil circuit is connected to the first return oil port through the first check valve. The accumulator is connected in parallel to the control oil circuit to buffer and absorb the impact of the brake fluid in the control oil circuit.

[0008] Optionally, the telescopic working stage includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool valve. The post-valve compensation valve is a three-position three-way valve. The oil in the main oil circuit and the load-sensitive oil circuit acts on both ends of the post-valve compensation valve. A spring is also provided on the side of the post-valve compensation valve close to the load-sensitive oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensitive oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel to the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load.

[0009] Optionally, the luffing working stage includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool valve. The post-valve compensation valve is a three-position three-way valve. The oil in the main oil circuit and the load-sensitive oil circuit acts on both ends of the post-valve compensation valve. A spring is also provided on the side of the post-valve compensation valve close to the load-sensitive oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensitive oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel to the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load.

[0010] Moreover, the luffing working stage further includes a first shuttle valve, and the first shuttle valve is arranged on the load-sensitive oil circuit.

[0011] Optionally, the LS working stage includes: a throttle orifice, a control valve, and a second shuttle valve. Among them, the throttle orifice and the control valve are used to reduce the pressure and relieve the pressure of the LS oil circuit of the LS working stage. The first inlet port of the second shuttle valve is connected to the outlet port of the first shuttle valve, and the outlet port of the second shuttle valve is connected to the LS oil circuit to introduce higher-pressure oil to ensure that the pressure of the load-sensitive pump meets the system requirements.

[0012] Optionally, the auxiliary hoisting working unit includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Wherein, the oil inlet of the electro-hydraulic proportional pressure reducing valve is communicated with the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is communicated with the hydraulically controlled proportional main spool valve, the post-valve compensation valve is a three-position three-way valve, the oil in the main oil circuit and the load-sensitive oil circuit acts on both ends of the post-valve compensation valve, and a spring is further arranged on one side of the post-valve compensation valve close to the load-sensitive oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensitive oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load.

[0013] Moreover, the secondary overflow valve increases the oil replenishing function to overcome the condition of insufficient flow supply during load movement.

[0014] Optionally, the main hoisting working unit includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Wherein, the oil inlet of the electro-hydraulic proportional pressure reducing valve is communicated with the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is communicated with the hydraulically controlled proportional main spool valve, the post-valve compensation valve is a three-position three-way valve, the oil in the main oil circuit and the load-sensitive oil circuit acts on both ends of the post-valve compensation valve, and a spring is further arranged on one side of the post-valve compensation valve close to the load-sensitive oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensitive oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load.

[0015] Moreover, the main hoisting working unit further includes a third shuttle valve. The first oil inlet of the third shuttle valve is communicated with the main winch load oil circuit, the second oil inlet of the third shuttle valve is communicated with the auxiliary winch load oil circuit, and the oil outlet of the third shuttle valve is communicated with the second oil inlet of the second shuttle valve.

[0016] Optionally, the slewing working unit includes: an electro-hydraulic proportional pressure reducing valve, a hydraulically controlled proportional main spool valve, a safety valve, a buffer valve, a free slewing valve, and a fourth shuttle valve. Wherein, the oil inlet of the electro-hydraulic proportional pressure reducing valve is communicated with the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is communicated with the hydraulically controlled proportional main spool valve, the oil inlet of the safety valve is communicated with the first oil outlet of the fourth shuttle valve, the oil outlet of the safety valve is communicated with the main oil return port of the system return oil circuit, the first control port of the buffer valve is communicated with the second oil outlet of the fourth shuttle valve, and the second control port of the buffer valve is connected in parallel with a spring to ensure that the pressure difference across the buffer valve is a fixed value. The free slewing valve is a two-position two-way solenoid valve. When the free slewing valve is energized, the working oil circuits at both ends controlled by the free slewing valve can be communicated.

[0017] The third oil supply port is connected to the hydraulically controlled proportional main spool valve, and an external power source can supply oil to the hydraulically controlled proportional main spool valve separately through the third oil supply port to achieve separate control.

[0018] Optionally, the tail section includes: a main relief valve and a second one-way valve. Among them, the oil inlet of the main relief valve is communicated with the second main oil supply port, the oil outlet of the main relief valve is communicated with the main oil return port of the system oil return circuit, and the system oil return circuit is communicated with the second oil return port through the second one-way valve.

[0019] According to a second aspect of the present invention, there is provided a crane, which includes the electro-hydraulic multi-way valve according to any one of the first aspects of the present invention.

[0020] The main advantages of the technical solution of the present invention are as follows:

[0021] 1. Integrate the control oil circuit, the oil return circuit and the make-up oil circuit, and can provide pilot control oil for the actions of each mechanism, saving the auxiliary pump, the make-up oil pump and simplifying the control pipeline;

[0022] 2. Integrate the electro-hydraulic proportional control valve group, the buffer valve group and the free slewing valve group of the slewing mechanism into one body, which can greatly simplify the pipeline layout of the slewing control, save space and make the structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0024] Figure 1 is a schematic structural diagram of an electro-hydraulic multi-way valve according to an embodiment of the present invention;

[0025] Figure 2 is Figure 1 a schematic structural diagram of the LS working section in the electro-hydraulic multi-way valve shown in

[0026] Description of the reference numerals:

[0027] 1: head section; 2: telescopic working section; 3: luffing working section

[0028] 4: LS working section; 5: auxiliary hoisting working section; 6: main hoisting working section

[0029] 7: slewing working section; 8: tail section

[0030] 31: post-valve compensation valve; 41: buffer valve; 42: free slewing valve DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the drawings.

[0033] As Figure 1 and Figure 2 shown, in an embodiment according to the present invention, an electro-hydraulic multi-way valve integrated with swing control is provided. This electro-hydraulic multi-way valve integrates functions such as telescoping, luffing up and down, main hoist rope retracting and paying out, auxiliary hoist rope retracting and paying out, swinging, control oil, and oil replenishment. It can greatly simplify the pipeline configuration, save auxiliary pumps and oil replenishment pumps, reduce costs, and make the structure more compact and convenient for finding fault points and later maintenance.

[0034] Specifically, the electro-hydraulic multi-way valve in this embodiment includes: the first section 1, the telescoping working section 2, the luffing working section 3, the LS working section 4, the auxiliary hoist working section 5, the main hoist working section 6, the swing working section 7, the last section 8, the pilot oil circuit, the system return oil circuit, the control oil circuit, the load sensing oil circuit, and the main oil circuit.

[0035] Among them, the first section 1, the telescoping working section 2, the luffing working section 3, the LS working section 4, the auxiliary hoist working section 5, the main hoist working section 6, the swing working section 7, and the last section 8 are connected in parallel through the pilot oil circuit, the system return oil circuit, the control oil circuit, and the load sensing oil circuit.

[0036] In addition, the electro-hydraulic multi-way valve is also provided with a first main oil supply port P1, a second main oil supply port P2, a third oil supply port P3, and a first return oil port T1. The first main oil supply port P1 and the first return oil port T1 are arranged on the first section 1, the second main oil supply port P2 is arranged on the last section 8, and the third oil supply port P3 is arranged on the swing working section 7.

[0037] As Figure 1 shown, the first section 1 includes: a pressure reducing valve, a safety valve, an accumulator, and a first one-way valve. Among them, the first main oil supply port P1 is connected to the pilot oil circuit through the pressure reducing valve to provide pilot control oil for the pilot oil circuit, so as to control the internal main spool valve, brake, and balance valve of the electro-hydraulic multi-way valve. The system return oil circuit is connected to the first return oil port T1 through the first one-way valve. The accumulator is connected in parallel to the control oil circuit to buffer and absorb the impact of the braking oil in the control oil circuit.

[0038] The telescopic working union 2 includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool, and a post-valve compensation valve 31. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, and the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool. When de-energized, the control oil of the hydraulically controlled proportional main spool is connected to the system return oil circuit. Thus, by changing the control current value of the electro-hydraulic proportional pressure reducing valve, the pilot control pressure of the hydraulically controlled proportional main spool can be changed, thereby controlling the stroke of the hydraulically controlled proportional main spool and the flow rate of the working oil port.

[0039] The post-valve compensation valve 31 is a three-position three-way valve. The oil in the main oil circuit and the load-sensing oil circuit acts on both ends of the post-valve compensation valve 31. A spring is also provided on the side of the post-valve compensation valve 31 close to the load-sensing oil circuit. The post-valve compensation valve 31 is used to compare the oil pressures between the main oil circuit and the load-sensing oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool to protect the load.

[0040] The luffing working union 3 includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool, and a post-valve compensation valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, and the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool. The post-valve compensation valve is a three-position three-way valve. The oil in the main oil circuit and the load-sensing oil circuit acts on both ends of the post-valve compensation valve. A spring is also provided on the side of the post-valve compensation valve close to the load-sensing oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensing oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool to protect the load.

[0041] Moreover, the luffing working union further includes a first shuttle valve, and the first shuttle valve is arranged on the load-sensing oil circuit.

[0042] It can be understood that the luffing working union 3 is similar in function to the telescopic working union 2, and the difference between them is that the luffing working union 3 is additionally provided with a first shuttle valve on the load-sensing oil circuit.

[0043] The LS working union 4 includes: a throttle orifice, a control valve, and a second shuttle valve. Among them, the throttle orifice and the control valve are used to reduce the pressure and relieve the pressure of the LS oil circuit of the LS working union. The first inlet port of the second shuttle valve is connected to the outlet port of the first shuttle valve, and the outlet port of the second shuttle valve is connected to the LS oil circuit to introduce higher-pressure oil to ensure that the pressure of the load-sensing pump meets the system requirements.

[0044] The auxiliary hoisting working union 5 includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool valve, the post-valve compensation valve is a three-position three-way valve, the oil in the main oil circuit and the load-sensitive oil circuit acts on both ends of the post-valve compensation valve, and a spring is also provided on the side of the post-valve compensation valve close to the load-sensitive oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensitive oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load.

[0045] Moreover, the secondary overflow valve adds an oil replenishment function to overcome the condition of insufficient oil flow supply during load movement.

[0046] It can be understood that the auxiliary hoisting working union 5 is similar in function to the telescopic working union 2. The difference between them is that the secondary overflow valve of the auxiliary hoisting working union 5 adds an oil replenishment function, which can meet the condition of insufficient oil flow supply during load movement.

[0047] The main hoisting working union 6 includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool valve, the post-valve compensation valve is a three-position three-way valve, the oil in the main oil circuit and the load-sensitive oil circuit acts on both ends of the post-valve compensation valve, and a spring is also provided on the side of the post-valve compensation valve close to the load-sensitive oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensitive oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load.

[0048] Moreover, the main hoisting working union also includes a third shuttle valve. The first inlet port of the third shuttle valve is connected to the main winch load oil circuit, the second inlet port of the third shuttle valve is connected to the auxiliary winch load oil circuit, and the outlet port of the third shuttle valve is connected to the second inlet port of the second shuttle valve.

[0049] It can be understood that the main hoisting working union 6 is similar in function to the auxiliary hoisting working union 5. The difference between them is that the main hoisting working union 6 is equipped with a third shuttle valve.

[0050] The slewing working union 7 includes: an electro-hydraulic proportional pressure reducing valve, a hydraulically controlled proportional main spool valve, a safety valve, a buffer valve, a free slewing valve, and a fourth shuttle valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, and the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool valve. Thus, by changing the control current value of the electro-hydraulic proportional pressure reducing valve, the pilot control pressure of the hydraulically controlled proportional main spool valve can be changed, and further the main spool stroke and the flow rate of the working oil port can be controlled. For example, when the hydraulically controlled proportional main spool valve is in the neutral position, the inlet port communicates with the return port. The return port is connected to the main return port of the system return oil circuit, and at the same time, it can supply oil to the main hoist and auxiliary hoist. The inlet port of the safety valve is connected to the first outlet port of the fourth shuttle valve, and the outlet port of the safety valve is connected to the main return port of the system return oil circuit for protecting the system.

[0051] The first control port of the buffer valve 41 is connected to the second outlet port of the fourth shuttle valve, and the second control port of the buffer valve is connected in parallel with a spring to ensure that the pressure difference across the buffer valve is a constant value. When the value exceeds the spring setting value, the first working oil port A and the second working oil port B communicate to balance the flow rate and pressure between the balance oil ports and reduce the impact. The free slewing valve 42 is a two-position two-way solenoid valve. When the free slewing valve 42 is energized, the working oil circuits controlled by the free slewing valve 42 at both ends can be made to communicate.

[0052] The third oil supply port P3 is connected to the hydraulically controlled proportional main spool valve, and an external power source can supply oil to the hydraulically controlled proportional main spool valve separately through the third oil supply port P3 to achieve separate control. The external power source can be a gear pump or a variable displacement piston pump.

[0053] The tail union 8 includes: a main relief valve and a second check valve. Among them, the inlet port of the main relief valve is connected to the second main oil supply port, the outlet port of the main relief valve is connected to the main return port of the system return oil circuit, and the system return oil circuit is connected to the second return port through the second check valve.

[0054] According to another aspect of the present invention, a crane is also provided, and the crane includes the electro-hydraulic multi-way valve in the above-described embodiment.

[0055] Thus, the electro-hydraulic multi-way valve with integrated slewing control according to the present invention has the following advantages:

[0056] 1. Integrating the control oil circuit, return oil circuit, and oil supply and replenishing oil circuit, it can provide pilot control oil for the actions of each mechanism, save auxiliary pumps and oil replenishing pumps, and simplify the control pipeline;

[0057] 2. Integrating the electro-hydraulic proportional control valve group, buffer valve group, and free slewing valve group of the slewing mechanism into one body can greatly simplify the pipeline layout of the slewing control, save space, and make the structure more compact.

[0058] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. In addition, in this text, "front", "rear", "left", "right", "upper" and "lower" are all referenced with respect to the placement state shown in the drawings.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended 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 they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electronically controlled multi-way valve integrated with swing control, characterized in that, The electro-hydraulic multi-way valve includes: a first section, a telescopic working section, a luffing working section, an LS working section, an auxiliary hoisting working section, a main hoisting working section, a slewing working section, a tail section, a pilot oil circuit, a system return oil circuit, a control oil circuit, a load sensing oil circuit, and a main oil circuit. Among them, the first section, the telescopic working section, the luffing working section, the LS working section, the auxiliary hoisting working section, the main hoisting working section, the slewing working section, and the tail section are connected in parallel through the pilot oil circuit, the system return oil circuit, the control oil circuit, and the load sensing oil circuit. The electro-hydraulic multi-way valve is also provided with a first main oil supply port, a second main oil supply port, a third oil supply port, and a first oil return port. The first main oil supply port and the first oil return port are arranged on the first section. The second main oil supply port is arranged on the tail section. The third oil supply port is arranged on the slewing working section; The first section includes: a pressure reducing valve, a safety valve, an accumulator, and a first check valve. Among them, the first main oil supply port is communicated with the pilot oil circuit through the pressure reducing valve to provide pilot control oil for the pilot oil circuit. The system return oil circuit is communicated with the first oil return port through the first check valve. The accumulator is connected in parallel to the control oil circuit to buffer and absorb the impact of the braking oil fluid in the control oil circuit; The slewing working section includes: an electro-hydraulic proportional pressure reducing valve, a hydraulically controlled proportional main spool valve, a safety valve, a buffer valve, a free slewing valve, and a fourth shuttle valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is communicated with the pilot oil circuit. The working oil port of the electro-hydraulic proportional pressure reducing valve is communicated with the hydraulically controlled proportional main spool valve. The inlet port of the safety valve is communicated with the first outlet port of the fourth shuttle valve. The outlet port of the safety valve is communicated with the main return port of the system return oil circuit. The first control port of the buffer valve is communicated with the second outlet port of the fourth shuttle valve. The second control port of the buffer valve is connected in parallel with a spring to ensure that the pressure difference at both ends of the buffer valve is a fixed value. The free slewing valve is a two-position two-way solenoid valve. When the free slewing valve is energized, the working oil circuits controlled by the free slewing valve at both ends can be communicated. The third oil supply port is connected to the hydraulically controlled proportional main spool valve. An external power source can supply oil to the hydraulically controlled proportional main spool valve alone through the third oil supply port to achieve independent control.

2. The integrated rotary control electro-hydraulic multi-way valve according to claim 1, wherein, The telescopic working section includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is communicated with the pilot oil circuit. The working oil port of the electro-hydraulic proportional pressure reducing valve is communicated with the hydraulically controlled proportional main spool valve. The post-valve compensation valve is a three-position three-way valve. The oil fluid of the main oil circuit and the load sensing oil circuit acts on both ends of the post-valve compensation valve. A spring is also arranged on the side of the post-valve compensation valve close to the load sensing oil circuit. The post-valve compensation valve is used to compare the oil fluid pressures between the main oil circuit and the load sensing oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load.

3. The electro-hydraulic multi-way valve with integrated swing control according to claim 2, characterized in that, The luffing working unit includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool valve, the post-valve compensation valve is a three-position three-way valve, the oil in the main oil circuit and the load-sensing oil circuit acts on both ends of the post-valve compensation valve, and a spring is further arranged on the side of the post-valve compensation valve close to the load-sensing oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensing oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load. Moreover, the luffing working unit further includes a first shuttle valve, and the first shuttle valve is arranged on the load-sensing oil circuit.

4. The electro-hydraulic multi-way valve with integrated swing control according to claim 3, characterized in that The LS working unit includes: a throttle orifice, a control valve, and a second shuttle valve. Among them, the throttle orifice and the control valve are used to reduce and relieve the pressure of the LS oil circuit of the LS working unit. The first inlet port of the second shuttle valve is connected to the outlet port of the first shuttle valve, and the outlet port of the second shuttle valve is connected to the LS oil circuit to introduce higher-pressure oil to ensure that the pressure of the load-sensing pump meets the system requirements.

5. The integrated rotary control electro-hydraulic multi-way valve according to claim 4, characterized in that, The auxiliary hoisting working unit includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool valve, the post-valve compensation valve is a three-position three-way valve, the oil in the main oil circuit and the load-sensing oil circuit acts on both ends of the post-valve compensation valve, and a spring is further arranged on the side of the post-valve compensation valve close to the load-sensing oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensing oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load. Moreover, the secondary overflow valve adds an oil replenishing function to overcome the condition of insufficient oil supply for the load movement.

6. The integrated rotary control electro-hydraulic multi-way valve according to claim 5, characterized in that, The main hoisting working unit includes: an electro-hydraulic proportional pressure reducing valve, a secondary overflow valve, a hydraulically controlled proportional main spool valve, and a post-valve compensation valve. Among them, the inlet port of the electro-hydraulic proportional pressure reducing valve is connected to the pilot oil circuit, the working oil port of the electro-hydraulic proportional pressure reducing valve is connected to the hydraulically controlled proportional main spool valve, the post-valve compensation valve is a three-position three-way valve, the oil in the main oil circuit and the load-sensing oil circuit acts on both ends of the post-valve compensation valve, and a spring is further arranged on the side of the post-valve compensation valve close to the load-sensing oil circuit. The post-valve compensation valve is used to compare the oil pressures between the main oil circuit and the load-sensing oil circuit to ensure that the pressure difference between the two is a fixed value. The secondary overflow valve is connected in parallel with the first working oil port and the second working oil port of the hydraulically controlled proportional main spool valve to protect the load. Moreover, the main hoisting working union further includes a third shuttle valve. The first oil inlet of the third shuttle valve is communicated with the main winch load oil circuit, the second oil inlet of the third shuttle valve is communicated with the auxiliary winch load oil circuit, and the oil outlet of the third shuttle valve is communicated with the second oil inlet of the second shuttle valve.

7. The electro-hydraulic multi-way valve with integrated swing control according to claim 6, characterized in that, The tail union includes a main relief valve and a second check valve. Wherein, the oil inlet of the main relief valve is communicated with the second main oil supply port, the oil outlet of the main relief valve is communicated with the main oil return port of the system oil return circuit, and the system oil return circuit is communicated with the second oil return port via the second check valve.

8. A crane, characterized in that, The crane includes the electro-hydraulic multi-way valve according to any one of claims 1 to 7.

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