An electronically controlled multi-way valve for medium-sized excavators

Abstract

The present invention relates to an electric-controlled multi-way valve for a medium-sized excavator, comprising two valve bodies, a right valve body and a left valve body, two main oil circuits, a main oil circuit 1 and a main oil circuit 2, the valve core components included in the right valve body are a load-unloading connection, a left travel connection, a rotary connection, a boom regeneration connection, a dipper arm regeneration connection and a standby connection in sequence; the valve core components included in the left valve body are a linear travel connection, a right travel connection, a boom connection, a bucket connection, a dipper arm regeneration connection and a load-unloading connection in sequence; the main oil circuit 1 and the main oil circuit 2 are connected to the oil port P1 and the oil port P2 respectively. Compared with the prior art, the present invention adopts an integral structure with a compact structure, which can meet the different requirements of various excavation actuators for flow pressure.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control, in particular to an electrically controlled multi-way valve used in a hydraulic system of a medium-sized excavator. Background Art

[0002] As one of the key components of the hydraulic system of excavators, the multi-way control valve is required to have the advantages of high working pressure, compact structure, small pressure loss, easy installation and operation, etc. The integral multi-way valve currently used in excavators has the disadvantages of complex valve core structure, complex valve body flow channel casting, large inlet and return oil pressure loss, and the pilot control method is mostly hydraulic control, which has problems such as multiple pilot lines, poor control flexibility, and unsatisfactory energy-saving effect. Summary of the invention

[0003] In view of the defects or one of the defects in the prior art, the present invention provides a new type of electric control multi-way valve, which adopts electric proportional control and the inlet and return oil of the E valve unit structure can be independently controlled. The technical solution adopted is:

[0004] A medium-sized excavator electronically controlled multi-way valve, comprising two valve bodies, a right valve body and a left valve body, and two main oil circuits, a main oil circuit 1 and a main oil circuit 2, characterized in that: the valve core components contained in the right valve body are unloading link 1, left travel link, rotary link, boom regeneration link, dipper arm regeneration link and spare link in sequence; the valve core components contained in the left valve body are linear travel link, right travel link, boom link, bucket link, dipper arm regeneration link and unloading link 2 in sequence; wherein the oil ports P1 and P2 are connected to the oil outlet of the dual variable pump, the oil ports R1 and R2 are connected to the oil tank, and each valve is connected to the oil outlet of the dual variable pump, and ... the oil ports R1 and R2 are connected to the oil tank, and the oil ports R1 and R2 are connected to the oil tank, and the oil ports R1 and R2 are connected to the oil tank, and the oil ports R1 and R2 are connected to The pilot oil port of the core assembly is connected to the corresponding proportional pressure reducing valve, and each working oil port is connected to the actuator; when the valve core is switched, the oil enters the actuator through each working oil port to drive the actuator to work; when the working pressure is higher than the set pressure of the main relief valve, the oil in the oil port P1 and the oil port P2 is unloaded from the main relief valve through the safety check valve; when the main relief valve fails or the load side pressure exceeds the set pressure of the overload relief valve, the oil is unloaded from the overload relief valve; the main oil circuit 1 and the main oil circuit 2 are connected to the oil port P1 and the oil port P2 respectively.

[0005] The main oil circuit one enters the central oil circuit one through the straight travel link, and the other enters the central oil circuit one through the left travel link; the main oil circuit two enters the central oil circuit two before the straight travel link, and the other enters the central oil circuit two through the straight travel link and the right travel link; the one-way throttle valve is located between the main oil circuit one and the central oil circuit one; the slewing link oil inlet one-way valve and the spare oil inlet one-way valve are connected to the central oil circuit two, and the boom link oil inlet one-way valve is connected to the central oil circuit one.

[0006] E valve units are provided on the main oil circuit one and the main oil circuit two. The E valve unit includes an E valve solenoid valve and a main-stage one-way valve. The E valve solenoid valve is a pilot flow valve, which controls the opening position of the main-stage one-way valve by controlling the upper and lower pressure differences of the main-stage one-way valve.

[0007] Furthermore, when the left and right travel links are started at the same time and any action of getting on the vehicle is performed, the main valve core of the straight travel link is switched to the leftmost position. At this time, the oil in the main oil circuit 1 is supplied to the left and right travel links, and the oil in the main oil circuit 2 is supplied to the getting on the vehicle action. When there is surplus oil in the main oil circuit 2, the oil is supplied to the main oil circuit 1 through the one-way throttle valve to give priority to the left and right travel actions. When the two pumps need to merge, the main valve core is switched to the secondary left position. At this time, the two pumps merge to speed up work efficiency.

[0008] Furthermore, when the boom is retracted, according to the flow regeneration requirement, the controller sends out a control current to control the opening area of ​​the boom valve core and the boom regeneration valve core, thereby achieving the best match between the boom retraction speed and the flow regeneration.

[0009] Further, the E-valve solenoid valve includes a bucket-linked E-valve 1, an arm-linked E-valve 2, a spare-linked E-valve, an arm-linked E-valve, a bucket-linked E-valve 2 and an arm-linked E-valve 1; the bucket-linked E-valve 1, the arm-linked E-valve 2 and the spare-linked E-valve are connected to the central oil circuit 1 17; the arm-linked E-valve, the bucket-linked E-valve 2 and the arm-linked E-valve 1 are connected to the central oil circuit 2 18.

[0010] Furthermore, when the boom is lowered, according to the flow regeneration demand, the controller sends out a control current to control the opening area of ​​the boom valve core and the boom regeneration valve core, and regenerates the boom rodless chamber oil to the central oil circuit one.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention has multiple working units, which are respectively located between the oil inlet of the valve body and the corresponding working oil port; the working unit includes a pilot module, a valve core assembly, and an E valve unit. A pilot electric proportional pressure reducing valve is provided between the two control ends of each valve core assembly and the pilot oil port. The pilot electric proportional pressure reducing valve is centrally installed on the end cover. The pilot oil inlet is connected to the pilot pump through the end cover oil inlet, and the pilot oil return is connected to the oil tank through the end cover oil return port. The oil inlet of the valve body is connected to the working oil pump through the main oil circuit, and the oil return port of the valve body is connected to the oil tank. An E valve unit is arranged on the oil inlet channel of each working joint, and the inlet of the E valve unit is connected to the main oil circuit, and the outlet is connected to the valve core.

[0013] 2. The product of the present invention has an E-valve unit, which includes an E-valve solenoid valve and a main-stage one-way valve. The E-valve solenoid valve is a pilot flow valve, which controls the upper and lower pressure differences of the main-stage one-way valve, thereby controlling the opening position of the main-stage one-way valve. When working, the current output by the electronic control system controls the output pilot pressure of the electric proportional pressure reducing valve and the flow area of ​​the E-valve unit, so as to achieve the purpose of controlling the movement direction and speed of the actuator. The current output by the electronic control system can achieve independent control of the working link oil return when the excavator is working, reduce pressure loss, and further save energy. When the excavator performs compound action operations, the flow to each link is allocated as needed according to the flow requirements of each actuator, so as to achieve good compound action control performance of the excavator and further improve working efficiency.

[0014] 3. Compared with the prior art, the product of the present invention has the following effects: the multi-way control valve adopts an integral structure, which is compact and can meet the different requirements of the excavation actuators for flow pressure; it has an E valve unit, and the real-time single action oil inlet and return oil are independently controlled to reduce pressure loss and achieve energy saving. During compound actions, the flow to each joint is distributed as needed to achieve good compound controllability and further improve work efficiency. This product is equipped with boom confluence, dipper rod confluence, bucket confluence and other valve body confluences, and has straight travel function, boost function, boom and dipper rod flow regeneration function. The dipper rod has flow regeneration and unloading functions. When the dipper rod needs to be quickly retracted, the hydraulic oil in the small chamber of the dipper rod can be regenerated to the large chamber of the dipper rod. When excavating, the hydraulic oil in the small chamber of the dipper rod is quickly unloaded, reducing the pressure and increasing the excavation force. The boom has a flow regeneration function. When regeneration is required, the oil in the large chamber of the boom is regenerated to the main oil circuit, which improves efficiency and reduces energy consumption. The electric control valve of the present invention realizes the control of the action of engineering machinery and can especially meet the different requirements of the actuators of 20-30 tons hydraulic excavators for flow pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is another structural schematic diagram of the present invention.

[0017] In the figure, 1-unloading link 1; 2-left travel link; 3-slewing link; 4-boom regeneration link; 5-arm link; 6-standby link; 7-straight travel link; 8-right travel link; 9-boom link; 10-bucket link; 11-arm regeneration link; 12-unloading link 2; 13-right valve body; 14-left valve body; 15-main oil circuit 1; 16-main oil circuit 2; 17-central oil circuit 1; 18-central oil circuit 2; 100-one-way throttle valve; 101-slewing link oil inlet one-way valve; 102-boom 103- boom locking valve; 104- boom regeneration check valve; 105- bucket E valve one; 106- stick E valve two; 107- stick locking valve; 108- spare E valve; 109- safety check valve; 110- main overflow valve; 111- boom E valve; 112- oil replenishment check valve; 113- bucket E valve two; 114- stick E valve one; 115- overload overflow valve; 116- spare oil check valve; 117- bucket plug. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings. It should be particularly noted that the terms "left", "right", "one", "two" and the like in this document are only for the convenience of description and do not refer to directions or quantities, and "left" and "right" are not equivalent to the "left" and "right" on the drawings.

[0019] Example 1, reference Figure 1 As shown, a medium-sized excavator electric control multi-way valve comprises two valve bodies, a right valve body and a left valve body, and two main oil circuits, a main oil circuit 1 and a main oil circuit 2, characterized in that: the valve core components contained in the right valve body are unloading link 1, left travel link, rotary link, boom regeneration link, dipper arm regeneration link and standby link in sequence; the valve core components contained in the left valve body are linear travel link, right travel link, boom link, bucket link, dipper arm regeneration link and unloading link 2 in sequence; wherein the oil ports P1 and P2 are connected to the oil outlet of the dual variable pump, the oil ports R1 and R2 are connected to the oil tank, and each link The pilot oil port of the valve core assembly is connected to the corresponding proportional pressure reducing valve, and each working oil port is connected to the actuator; when the valve core is switched, the oil enters the actuator through each working oil port to drive the actuator to work; when the working pressure is higher than the set pressure of the main relief valve, the oil in the oil port P1 and the oil port P2 is unloaded from the main relief valve through the safety check valve; when the main relief valve fails or the load side pressure exceeds the set pressure of the overload relief valve, the oil is unloaded from the overload relief valve; the main oil circuit 1 and the main oil circuit 2 are connected to the oil port P1 and the oil port P2 respectively;

[0020] The main oil circuit 1 enters the central oil circuit 1 through the straight travel link, and the other enters the central oil circuit 1 through the left travel link; the main oil circuit 2 enters the central oil circuit 2 before the straight travel link, and the other enters the central oil circuit 2 through the straight travel link and the right travel link; the one-way throttle valve is located between the main oil circuit 1 and the central oil circuit 1; the swing link oil inlet one-way valve and the spare oil inlet one-way valve are connected to the central oil circuit 2, and the boom link oil inlet one-way valve is connected to the central oil circuit 1;

[0021] The main oil circuit 1 and the main oil circuit 2 are provided with E valve units, which include an E valve solenoid valve and a main-stage one-way valve. The E valve solenoid valve is a pilot flow valve, which controls the opening position of the main-stage one-way valve by controlling the upper and lower pressure differences of the main-stage one-way valve.

[0022] When the left and right travel links are started at the same time and any action of getting on the vehicle is performed, the main valve core of the linear travel link is switched to the leftmost position. At this time, the oil in the main oil circuit 1 is supplied to the left and right travel links, and the oil in the main oil circuit 2 is supplied to the vehicle getting action. When the oil in the main oil circuit 2 is surplus, the oil is supplied to the main oil circuit 1 through the one-way throttle valve to give priority to the left and right travel actions. When the two pumps need to merge, the main valve core is switched to the second left position, and the two pumps are merged at this time to speed up the work efficiency.

[0023] When the boom is retracted, the controller sends out a control current according to the flow regeneration demand to control the opening area of ​​the boom valve core and the boom regeneration valve core to achieve the best match between the boom retraction speed and flow regeneration;

[0024] The E-valve solenoid valve includes a bucket E-valve 1, a stick E-valve 2, a spare E-valve, a boom E-valve, a bucket E-valve 2 and a stick E-valve 1; the bucket E-valve 1, the stick E-valve 2 and the spare E-valve are connected to the central oil circuit 1; the boom E-valve, the bucket E-valve 2 and the stick E-valve 1 are connected to the central oil circuit 2;

[0025] When the boom is lowered, according to the flow regeneration demand, the controller sends out a control current to control the opening area of ​​the boom valve core and the boom regeneration valve core, and regenerate the oil in the boom rodless chamber to the central oil circuit one.

[0026] This embodiment has multiple working units, which are respectively located between the oil inlet of the valve body and the corresponding working oil port; the working unit includes a pilot module, a valve core assembly, and an E valve unit. A pilot electric proportional pressure reducing valve is provided between the two control ends of each valve core assembly and the pilot oil port. The pilot electric proportional pressure reducing valve is centrally installed on the end cover. The pilot oil inlet is connected to the pilot pump through the end cover oil inlet, and the pilot oil return is connected to the oil tank through the end cover oil return port. The oil inlet of the valve body is connected to the working oil pump through the main oil circuit, and the oil return port of the valve body is connected to the oil tank. An E valve unit is arranged on the oil inlet channel of each working joint, and the inlet of the E valve unit is connected to the main oil circuit, and the outlet is connected to the valve core.

[0027] The E valve unit of this embodiment includes an E valve solenoid valve and a main-stage one-way valve. The E valve solenoid valve is a pilot flow valve, which controls the opening position of the main-stage one-way valve by controlling the upper and lower pressure differences of the main-stage one-way valve. When working, the current output by the electronic control system controls the output pilot pressure of the electric proportional pressure reducing valve and the flow area of ​​the E valve unit to achieve the purpose of controlling the movement direction and speed of the actuator. The current output by the electronic control system can achieve independent control of the working link oil return when the excavator is working, reduce pressure loss, and further save energy. When the excavator performs compound action operations, the flow to each link is allocated as needed according to the flow requirements of each actuator, so as to achieve good compound action control performance of the excavator and further improve working efficiency.

[0028] The multi-way control valve of this embodiment adopts an integral structure with a compact structure to meet the different flow pressure requirements of each actuator of the excavation; it has an E valve unit, and the oil return of a single action is independently controlled in real time, which reduces pressure loss and achieves energy saving. During compound actions, the flow to each joint is distributed as needed to achieve good compound controllability and further improve work efficiency. This product is provided with a boom confluence, a dipper rod confluence, a bucket confluence and other valve body confluences, and has a straight-line function, a boost function, and a boom and dipper rod flow regeneration function. The dipper rod has flow regeneration and unloading functions. When the dipper rod needs to be quickly retracted, the hydraulic oil in the small chamber of the dipper rod can be regenerated to the large chamber of the dipper rod. When excavating, the hydraulic oil in the small chamber of the dipper rod is quickly unloaded, reducing the pressure and increasing the excavation force. The boom has a flow regeneration function. When regeneration is required, the oil in the large chamber of the boom is regenerated to the main oil circuit, which improves efficiency and reduces energy consumption. The electric control valve of the present invention realizes the control of the action of the engineering machinery and can especially meet the different flow pressure requirements of each actuator of a 20-30 ton hydraulic excavator.

[0029] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An electric-controlled multi-way valve for a medium-sized excavator, comprising two valve bodies, a right valve body (13) and a left valve body (14), and two main oil circuits, a main oil circuit 1 (15) and a main oil circuit 2 (16), characterized in that: The valve core components included in the right valve body (13) are, in sequence, a load unloading link 1 (1), a left travel link (2), a swing link (3), a boom regeneration link (4), a dipper arm regeneration link (5), and a standby link (6); the valve core components included in the left valve body (14) are, in sequence, a linear travel link (7), a right travel link (8), a boom link (9), a bucket link (10), a dipper arm regeneration link (11), and a load unloading link 2 (12); wherein the oil ports P1 and P2 are connected to the oil outlet of the dual variable pump, the oil ports R1 and R2 are connected to the oil tank, and the pilot oil ports of each valve core component are connected to the corresponding proportional pressure reducing valve , each working oil port is connected to the actuator; when the valve core is switched, the oil enters the actuator through each working oil port to drive the actuator to work; when the working pressure is higher than the set pressure of the main relief valve (110), the oil in the oil port P1 and the oil port P2 is unloaded from the main relief valve (110) through the safety check valve (109); when the main relief valve (110) fails or the load side pressure exceeds the set pressure of the overload relief valve (115), the oil is unloaded from the overload relief valve (115); the main oil circuit 1 (15) and the main oil circuit 2 (16) are connected to the oil port P1 and the oil port P2 respectively; One of the main oil circuits (15) passes through the straight travel link (7) to enter the central oil circuit (17), and the other passes through the left travel link (2) to enter the central oil circuit (17); one of the main oil circuits (16) passes through the straight travel link (7) to enter the central oil circuit (18) before the straight travel link (7), and the other passes through the straight travel link (7) and the right travel link (8) to enter the central oil circuit (18); the one-way throttle valve (100) is located between the main oil circuit (15) and the central oil circuit (17); the swing link oil inlet check valve (101) and the spare oil inlet check valve (116) are connected to the central oil circuit (18), and the boom link oil inlet check valve (102) is connected to the central oil circuit (17); The main oil circuit 1 (15) and the main oil circuit 2 (16) are provided with an E valve unit, which includes an E valve solenoid valve and a main-stage check valve. The E valve solenoid valve is a pilot flow valve, which controls the opening position of the main-stage check valve by controlling the upper and lower pressure differences of the main-stage check valve. When the left and right travel links are started at the same time and any of the boarding actions are performed, the main valve core of the linear travel link (7) is switched to the leftmost position. At this time, the oil in the main oil circuit 1 (15) is supplied to the left and right travel links, and the oil in the main oil circuit 2 (16) is supplied to the boarding action. When the oil in the main oil circuit 2 (16) is surplus, the oil is supplied to the main oil circuit 1 (15) through the one-way throttle valve (100), so as to give priority to the left and right travel actions. When the two pumps need to merge, the main valve core is switched to the secondary left position. At this time, the two pumps merge to speed up the work efficiency. When the boom is retracted, the controller sends out a control current according to the flow regeneration demand to control the opening area of ​​the boom valve core and the boom regeneration valve core to achieve the best match between the boom retraction speed and flow regeneration; The E-valve solenoid valve comprises a bucket-linked E-valve 1 (105), a boom-linked E-valve 2 (106), a spare-linked E-valve (108), a boom-linked E-valve (111), a bucket-linked E-valve 2 (113) and a boom-linked E-valve 1 (114); the bucket-linked E-valve 1 (105), the boom-linked E-valve 2 (106) and the spare-linked E-valve (108) are connected to a central oil circuit 1 (17); the boom-linked E-valve (111), the bucket-linked E-valve 2 (113) and the boom-linked E-valve 1 (114) are connected to a central oil circuit 2 (18); When the boom is lowered, according to the flow regeneration demand, the controller sends out a control current to control the opening area of ​​the boom valve core and the boom regeneration valve core, and regenerates the oil in the boom rodless chamber to the central oil circuit 1 (17).

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