One-way and two-way pipeline switching system for excavator

Abstract

The utility model provides a one-way and two-way pipeline switching system for an excavator, and belongs to the technical field of excavators. The one-way and two-way pipeline switching system comprises a proportional electromagnetic valve set, a main valve, a normally-open valve set and a controller. The controller is respectively connected with the proportional electromagnetic valve group and the normally open valve group; the main valve is respectively connected with the proportional electromagnetic valve group, the normally open valve group and the corresponding accessories; and the normally open valve group is arranged at any position except the high-pressure oil pipe. The one-way and two-way switching electromagnetic valve, namely the normally-open valve group, can be mounted at any position with space while the length and responsiveness of oil inlet and return pipelines from accessories such as crushing and hydraulic shears to the main valve are consistent, and the position limitation is broken through.

Description

Technical Field

[0001] This utility model belongs to the field of excavator technology, and in particular relates to a single and double pipeline switching system for excavators. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] The piping of the excavator attachment breaker is a unidirectional piping for crushing conditions, while a bidirectional piping is required for other conditions. If an additional bidirectional piping is installed, it will increase space and cost. Generally, a unidirectional-bidirectional switching method is adopted to allow one piping to handle both crushing and other conditions at the same time.

[0004] The existing one-way and two-way switching uses a 2-position 3-way valve group. When the one-way pipeline returns oil in the crushing condition, the oil enters from the P port of the 2-position 3-way valve group and flows back to the oil distribution tank from the B port.

[0005] When using a bidirectional pipeline for oil return in non-crushing conditions, the oil enters from port P of the 2-position 3-way valve assembly and flows back to the main valve multi-way valve from port A. This bidirectional switching system is simple and efficient. However, to ensure that the inlet and outlet oil pipelines of the high-pressure oil circuit are of the same length (meaning that the two pipelines connecting the attachment and the main valve are of the same length) and that the handle response performance is consistent, the bidirectional switching solenoid valve must be installed on the main valve. This is especially true for mini excavators under 3 tons, where the pipelines around the main valve are dense, leaving no space for the bidirectional switching solenoid valve. Utility Model Content

[0006] The purpose of this utility model is to provide a single / double-direction pipeline switching system for excavators, which ensures that the inlet and outlet oil lines of the high-pressure oil circuit are of the same length and the operating handle has the same responsiveness. At the same time, it solves the limitation that the single / double-direction switching solenoid valve cannot be placed on the main valve due to the influence of multiple pipelines, so that it can be assembled in any position.

[0007] To achieve the above objectives, this utility model provides a single / double-way pipeline switching system for excavators, including a proportional solenoid valve group, a main valve, a normally open valve group, and a controller;

[0008] The controller is connected to the proportional solenoid valve group and the normally open valve group respectively;

[0009] The main valve is connected to the proportional solenoid valve group, the normally open valve group and the corresponding attachments respectively;

[0010] The normally open valve assembly can be located anywhere except for the high-pressure oil pipe.

[0011] Furthermore, the proportional solenoid valve assembly is a 3-way proportional solenoid valve located at the left rear end of the excavator platform.

[0012] Furthermore, the normally open valve assembly is a 2-position single normally open solenoid valve located on the right rear side of the excavator platform.

[0013] Furthermore, the main valve is a 10-port load-sensitive directional valve with a compensation valve, located on the left front side of the excavator platform.

[0014] Furthermore, the proportional solenoid valve assembly consists of at least two 3-way proportional valves, including an oil inlet P and an oil return port T, and the proportional solenoid valve assembly includes a pilot oil port A and a pilot oil port B.

[0015] Furthermore, the main valve includes multiple directional valves, each of which includes a pilot port pa6, a pilot port pb6, a high-pressure port A6, and a high-pressure port B6.

[0016] Furthermore, the normally open valve assembly has an oil inlet Pck and an oil return port Tck.

[0017] Furthermore, the normally open valve assembly, i.e. the one-way and two-way switching solenoid valve, is normally open by default.

[0018] Furthermore, the pilot port A on the proportional solenoid valve assembly is connected to the pa6 interface of the corresponding directional valve on the main valve, and the pilot port B is connected to the pb6 interface of the corresponding directional valve on the main valve.

[0019] The high-pressure oil port A6 and high-pressure oil port B6 on the main valve are respectively connected to the inlet and outlet ports of the corresponding attachments. The attachments can be crushers or other attachments. Specifically, the high-pressure oil port B6 on the main valve is connected to the attachment at one end through a three-way connector, and the other end is connected to the oil inlet port Pck on the normally open valve group.

[0020] The inlet port Pck of the normally open valve group is connected to the B6 port of the corresponding directional valve on the main valve, and the return port Tck is connected to the radiator.

[0021] The technical solution of this utility model has the following beneficial effects:

[0022] The normally open valve assembly of this utility model serves as a one-way switching solenoid valve. The normally open valve assembly can be arranged at any position outside the high-pressure oil pipe, so that the inlet and outlet oil pipes of the high-pressure oil circuit of micro excavators under 3 tons are of the same length and have the same response. At the same time, it solves the limitation of the one-way switching solenoid valve being unable to be arranged on the main valve due to the influence of multiple pipelines.

[0023] This utility model satisfies the requirement that the length and responsiveness of the inlet and return oil pipelines from attachments such as crushers and hydraulic shears to the main valve are consistent, while the one-way and two-way switching solenoid valve, i.e., the normally open valve group, can be installed in any available location, overcoming the limitations of location.

[0024] Advantages of the present invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0026] Figure 1 This is a system structure diagram of a specific embodiment of the present invention.

[0027] Figure 2 This is a structural diagram of the proportional solenoid valve assembly in a specific embodiment of this utility model.

[0028] Figure 3 This is a structural diagram of the normally open valve assembly in a specific embodiment of this utility model.

[0029] Figure 4 This is a structural diagram of the main valve in a specific embodiment of this utility model.

[0030] Figure 5 This is a schematic diagram illustrating the switching to a unidirectional loop in a specific embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram illustrating the switching to a bidirectional loop in a specific embodiment of this utility model.

[0032] The components include: 1. Proportional solenoid valve assembly; 2. Main valve; 3. Normally open valve assembly; and 4. Controller. Detailed Implementation

[0033] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this utility model.

[0035] Where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0036] This embodiment uses a mini excavator with a capacity of less than 3 tons as an example to describe the present invention in detail. This embodiment discloses a single / double-direction pipeline switching system for excavators, such as... Figure 1 As shown,

[0037] Includes: proportional solenoid valve assembly 1, main valve 2, normally open valve assembly 3, and controller 4;

[0038] The controller 4 is connected to the proportional solenoid valve group 1 and the normally open valve group 3 respectively;

[0039] The main valve 2 is connected to the proportional solenoid valve group 1, the normally open valve group 3, and the corresponding attachments, respectively.

[0040] Normally open valve group 3 can be located anywhere except for the high-pressure oil pipe.

[0041] The proportional solenoid valve assembly 1 includes pilot port A and pilot port B; the proportional solenoid valve assembly 1 is a 3-way proportional solenoid valve, located at the left rear end of the excavator platform.

[0042] In specific implementation methods, such as Figure 2 As shown, the proportional solenoid valve group 1 consists of four 3-way proportional valves, including an oil inlet P, an oil return port T, and pilot ports A, B, C, and D. The pilot ports are used to provide pilot oil for reversing to the main valve 2.

[0043] In this embodiment, only pilot ports A and B are used; the other two are not used.

[0044] The main valve 2 includes multiple directional valves, one of which includes pilot port pa6, pilot port pb6, high-pressure port A6, and high-pressure port B6. The main valve 2 is a 10-port load-sensitive directional valve with a compensation valve, located on the left front side of the excavator platform.

[0045] In specific implementation methods, such as Figure 4 As shown, the main valve 2 includes an oil inlet P1, a branch oil inlet Pp, a return oil inlet T1, a return oil inlet T2, a return oil inlet TS, a load-sensitive feedback oil inlet LS2, and multiple directional valves and compensating valves. The directional valves are used to connect and control different types of actuation pipelines, from left to right: directional valves and compensating valves for bulldozer blade, left travel, right travel, swing, boom yaw, spare 1, spare 2, boom, stick, and bucket.

[0046] In specific implementation methods, such as Figure 3 As shown, the normally open valve assembly 3 includes an oil inlet P. ck and return oil port T ck Normally open valve group 3 is a 2-position single normally open solenoid valve located on the right rear side of the excavator platform. Normally open valve group 3 is a single / double-direction switching solenoid valve. It is normally open by default. When the instrument is operated in single-direction mode, the solenoid valve of normally open valve group 3 is de-energized and becomes normally open.

[0047] In a specific implementation, the connection relationships between the main valve 2 and the proportional solenoid valve group 1, the normally open valve group 3, and the corresponding attachments are as follows:

[0048] Pilot port A on proportional solenoid valve assembly 1 is connected to the pa6 port of the corresponding directional valve on main valve 2, and pilot port B is connected to the pb6 port of the corresponding directional valve on main valve 2.

[0049] The high-pressure oil port A6 and high-pressure oil port B6 on the main valve 2 are respectively connected to the inlet and outlet ports of the corresponding attachments. The attachments can be crushers or other attachments. Specifically, the high-pressure oil port B6 on the main valve 2 is connected to the attachment at one end through a three-way connector, and the other end is connected to the oil inlet port Pck on the normally open valve group 3.

[0050] It should be noted that in a one-way circuit, A6 is connected to the oil inlet and B6 is connected to the oil return port; in a two-way circuit, they are the oil inlet and oil return ports to each other.

[0051] The oil inlet Pck of the normally open valve group 3 is connected to the B6 interface of the corresponding directional valve on the main valve 2, and the oil return Tck is connected to the radiator.

[0052] In specific implementation methods, such as Figure 5 As shown, when the normally open valve assembly 3 remains open due to power failure, the return oil from the high-pressure port B6 of the corresponding directional valve on the main valve 2 is split into two paths via a three-way connector. One path flows back to the main valve 2, and the other path flows to the radiator via the normally open valve assembly 3. Since the resistance encountered by the hydraulic oil flowing back to the main valve 2 is greater than that flowing back to the radiator, according to the principle of minimum energy, the hydraulic oil will flow to the radiator, forming a one-way pipeline system.

[0053] When the pilot port A of the proportional solenoid valve group 1 is energized, the hydraulic oil controls the pilot oil of the corresponding directional valve pa6 of the main valve 2 to push the valve core of the corresponding directional valve to switch. Then, the high pressure oil of the valve enters the high pressure port B6 from the high pressure port A6 of the corresponding directional valve of the main valve 2, and flows back to the normally open valve group 3 through the three-way connector to the radiator to form a one-way circuit.

[0054] like Figure 6 As shown, when the normally open valve group 3 is energized and closed, the return oil from the high-pressure port B6 of the corresponding directional valve on the main valve 2 is split into two paths via a three-way connector: one path flows back to the main valve 2, and the other path flows to the normally open valve group 3. Since the normally open valve group 3 is closed and the oil circuit is blocked, the hydraulic oil can only return to the main valve 2, forming a two-way pipeline system.

[0055] When the pilot port A of the proportional solenoid valve group 1 is energized, the hydraulic oil controls the pilot oil of the corresponding directional valve pa6 of the main valve 2 to push the valve core of the corresponding directional valve to switch. Then, the high-pressure oil of the corresponding valve enters the high-pressure port B6 from the high-pressure port A6 of the corresponding directional valve of the main valve 2 and flows back to the main valve 2. When the pilot port B of the proportional solenoid valve group 1 is energized, the hydraulic oil controls the pilot oil of the corresponding directional valve pb6 of the main valve 2 to push the valve core of the corresponding directional valve to switch. Then, the high-pressure oil of the corresponding valve enters the high-pressure port A6 from the high-pressure port B6 of the corresponding directional valve and flows back to the main valve 2, forming a bidirectional circuit.

[0056] In a specific embodiment, when switching to a one-way pipeline circuit to cope with crushing conditions, the instrument operation is in one-way pipeline mode. The controller 4 receives and processes the instrument signal and outputs a control signal to the normally open valve group 3. The normally open valve group 3 is normally open by default when de-energized. The right handle is operated to output a signal to the first proportional solenoid valve of the controller 4. After the pilot control of the first proportional solenoid valve is activated, the second proportional solenoid valve pilots the return oil, and the corresponding directional valve of the main valve 2 performs pilot control.

[0057] When switching the bidirectional pipeline circuit to handle non-crushing conditions, the first right handle is operated. The operation of the first right handle is converted into an electrical signal and sent to controller 4. Upon receiving the signal from the first right handle, controller 4 outputs a control signal to the first proportional solenoid valve. Upon receiving the signal from controller 4, the first proportional solenoid valve activates its pilot control function. After the pilot control of the first proportional solenoid valve is activated, the second proportional solenoid valve begins to return oil. Finally, the corresponding directional valve of main valve 2 receives the pilot control signal. Similarly, the operation of the second right handle is converted into an electrical signal and sent to controller 4. Controller 4 outputs a corresponding signal to the second proportional solenoid valve based on the signal from the second right handle. Upon receiving the signal, the second proportional solenoid valve activates its pilot control function. After the pilot control of the second proportional solenoid valve is activated, the first proportional solenoid valve begins to return oil, and the corresponding directional valve of main valve 2 again receives the pilot control signal.

[0058] The working principle of this utility model is as follows:

[0059] When the normally open solenoid valve remains open, the hydraulic oil return from the high-pressure port B6 of the corresponding directional valve on the main valve is split into two paths via a three-way connector: one path flows back to the main valve, and the other path flows to the radiator via the normally open valve assembly. Because the resistance to the hydraulic oil returning to the main valve is greater than that returning to the radiator, according to the principle of minimum energy, the hydraulic oil will flow to the radiator, forming a one-way pipeline system.

[0060] When the normally open solenoid valve is energized and closed, the return oil from the high-pressure port B6 of the corresponding directional valve on the main valve is split into two paths via a tee connector: one flows back to the main valve, and the other flows to the normally open valve assembly. Since the normally open valve assembly is closed, the oil circuit is blocked, and the hydraulic oil can only return to the main valve, forming a bidirectional pipeline system. This circuit ensures that the lengths of the high-pressure oil inlet and return pipelines are consistent, and the normally open valve assembly can be placed anywhere outside the high-pressure oil pipeline without limitation.

[0061] The normally open valve assembly of this utility model serves as a one-way switching solenoid valve. The normally open valve assembly can be arranged at any position outside the high-pressure oil pipe, so that the inlet and outlet oil pipes of the high-pressure oil circuit of micro excavators under 3 tons are of the same length and have the same response. At the same time, it solves the positional limitation of the one-way switching solenoid valve, which cannot be arranged on the main valve due to the influence of multiple pipelines.

[0062] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A single / double-direction pipeline switching system for excavators, characterized in that, Includes proportional solenoid valve assembly, main valve, normally open valve assembly, and controller; The controller is connected to the proportional solenoid valve group and the normally open valve group respectively; The main valve is connected to the proportional solenoid valve group, the normally open valve group and the corresponding attachments respectively; The normally open valve assembly can be located anywhere except for the high-pressure oil pipe.

2. The excavator single / double-way pipeline switching system as described in claim 1, characterized in that, The proportional solenoid valve assembly is a 3-way proportional solenoid valve, located at the left rear end of the excavator platform.

3. The excavator single / double-way pipeline switching system as described in claim 1, characterized in that, The normally open valve assembly is a 2-position single normally open solenoid valve located on the right rear side of the excavator platform.

4. The excavator single / double-way pipeline switching system as described in claim 1, characterized in that, The main valve is a 10-port load-sensitive directional valve with a compensation valve, located on the left front side of the excavator platform.

5. The excavator single / double-way pipeline switching system as described in claim 1, characterized in that, The proportional solenoid valve assembly consists of at least two 3-way proportional valves, including an oil inlet P and an oil return port T. The proportional solenoid valve assembly also includes a pilot port A and a pilot port B.

6. The excavator single / double-way pipeline switching system as described in claim 5, characterized in that, The main valve includes multiple directional valves, and the directional valves include pilot port pa6, pilot port pb6, high-pressure port A6, and high-pressure port B6.

7. The excavator single / double-way pipeline switching system as described in claim 6, characterized in that, The normally open valve assembly has an oil inlet port Pck and an oil return port Tck.

8. The excavator single / double-way pipeline switching system as described in claim 7, characterized in that, The valve assembly is a single / double-direction switching solenoid valve, which is normally open by default.

9. The excavator single / double-way pipeline switching system as described in claim 8, characterized in that, The pilot port A on the proportional solenoid valve assembly is connected to the pa6 port of the corresponding directional valve on the main valve, and the pilot port B is connected to the pb6 port of the corresponding directional valve on the main valve. The high-pressure oil port A6 and high-pressure oil port B6 on the main valve are respectively connected to the inlet and outlet ports of the corresponding attachments. The attachments can be crushers or other attachments. Specifically, the high-pressure oil port B6 on the main valve is connected to the attachment at one end through a three-way connector, and the other end is connected to the oil inlet port Pck on the normally open valve group. The inlet port Pck of the normally open valve assembly is connected to the B6 port of the corresponding directional valve on the main valve, and the return port Tck is connected to the radiator.

10. An excavator, characterized in that, The excavator single / double pipeline switching system as described in any one of claims 1-9 is applied.

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