Hydraulic pilot system of remote control excavator

Abstract

The utility model discloses a hydraulic pilot system of a remote control excavator. The system mainly comprises a pilot pump, a safety electromagnetic valve, a switching electromagnetic valve, a remote control proportional pressure reducing valve group, a shuttle valve assembly, a main control valve, a local operating handle and a foot valve, according to the hydraulic pilot system of the remote control excavator, pressure oil output by a pilot pump is input to a remote control proportional pressure reducing valve group through a switching electromagnetic valve, the remote control proportional pressure reducing valve group controls reversing of valve elements of action links of a main control valve under control signals, and remote control operation of the whole excavator is achieved; proportional pressure reducing valve set control oil and local handle pedal control oil are selected through a shuttle valve, and coexistence of remote control operation and local operation of the hydraulic excavator is achieved. The hydraulic excavator remote control device can quickly realize a remote control function on a traditional hydraulic excavator, has the characteristics of ingenious design, reasonable structure, convenience in use, strong practicability and the like, and is suitable for hydraulic excavators with different tonnages.

Description

TECHNICAL FIELD

[0001] The utility model relates to excavator mechanical field, especially a kind of remote control excavator hydraulic pilot system. BACKGROUND

[0002] With the development of economy and the change of market demand, driver operates on excavator under conventional environment, but in some environment, such as large-scale mining, rescue and disaster relief site, gradually start to use remote control remote operation excavator to work, i.e. Figure 1 As shown in the figure, the driver can only sit in the cab and operate the hydraulic handle and foot pedal to complete the operation of the traditional hydraulic excavator. SUMMARY

[0003] In view of the technical problem that the driver can only sit in the cab and operate the hydraulic handle and foot pedal during the operation of the traditional hydraulic excavator, a remote control excavator hydraulic pilot system is proposed.

[0004] The technical solution of the utility model is: a remote control excavator hydraulic pilot system, comprising a pilot pump, the oil outlet of the pilot pump is connected to the oil inlet of a safety electromagnetic valve, the oil outlet of the safety electromagnetic valve is connected to the oil inlet of a switching electromagnetic valve, the first oil outlet of the switching electromagnetic valve is connected to the oil inlet of a remote control proportional pressure reducing valve group, the second oil outlet of the switching electromagnetic valve is connected to the oil inlet of a local operation handle and foot pedal valve, the oil outlet of the remote control proportional pressure reducing valve group is connected to the shuttle valve first oil inlet of a shuttle valve assembly, the shuttle valve second oil inlet of the shuttle valve assembly is connected to the oil outlet of the local operation handle and foot pedal valve, and the shuttle valve oil outlet of the shuttle valve assembly is connected to the valve core pilot oil port of a main control valve.

[0005] Preferably, it further comprises a remote control controller, which outputs on-off signals to the safety electromagnetic valve.

[0006] Preferably, the remote control controller outputs on-off signals to the switching electromagnetic valve.

[0007] Preferably, the remote control controller outputs control signals to the proportional pressure reducing valve group.

[0008] Preferably, the remote control controller outputs control signals in a positive proportional relationship with the oil outlet pressure of the proportional pressure reducing valve group.

[0009] Preferably, the remote control proportional pressure reducing valve group comprises a plurality of proportional pressure reducing valves.

[0010] Preferably, the shuttle valve assembly is provided in multiple, the number being the same as that of the proportional pressure reducing valves.

[0011] Preferably, the oil outlet of the proportional pressure reducing valve is connected to the shuttle valve first oil inlet of the shuttle valve assembly.

[0012] The utility model discloses a beneficial effect lies in: the utility model discloses a kind of remote control excavator hydraulic pilot system, can realize remote control function on traditional hydraulic excavator quickly, with clever design, it is reasonable in structure, easy to use, practicality is strong etc. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the hydraulic pilot system principle diagram of prior art excavator local operation;

[0014] Figure 2 It is the hydraulic pilot system principle diagram of the utility model remote control excavator;

[0015] Figure 3 It is Figure 2 Enlarged view of A in it;

[0016] Figure 4 It is Figure 2 Enlarged view of B in it;

[0017] Figure 5 It is Figure 2 Enlarged view of C in it;

[0018] Figure 6 It is the shuttle valve right section schematic view of the utility model;

[0019] In the drawing, the component name corresponding to each reference numeral is as follows:

[0020] 1, pilot pump;2, safety solenoid valve;3, switching solenoid valve;31, first oil outlet;32, second oil outlet;4, remote control proportional pressure reducing valve group;5, shuttle valve;51, shuttle valve first oil inlet;52, shuttle valve second oil inlet;53, shuttle valve oil outlet;6, main control valve;7, local operation handle and foot valve; DETAILED DESCRIPTION

[0021] The utility model will be described in detail in combination with the drawings and specific embodiment. This embodiment is implemented with the utility model technical scheme as the premise, gives detailed implementation mode and specific operation process, but the protection scope of the utility model is not limited to the following examples.

[0022] Reference Figure 2 、 3 As shown in the utility model provides a kind of remote control excavator hydraulic pilot system, including pilot pump 1, the oil outlet of pilot pump 1 is connected the oil inlet of safety solenoid valve 2, pilot pump 1 is driven under excavator engine, and constant flow pressure oil is output to safety solenoid valve 2;

[0023] Safety solenoid valve 2 is controlled by excavator safety handle and remote controller jointly, and the oil outlet of safety solenoid valve 2 is connected the oil inlet of switching solenoid valve 3;

[0024] Reference Figure 2 , 4 As shown in the figure, the switching electromagnetic valve 3 is controlled by a remote controller or directly controlled by the machine, and the first oil outlet 31 of the switching electromagnetic valve 3 is connected to the oil inlet of the remote proportional pressure reducing valve group 4; the remote proportional pressure reducing valve group 4 includes a plurality of proportional pressure reducing valves, which can be 12, and the remote proportional pressure reducing valve group 4 is controlled by a remote controller;

[0025] Reference Figure 2 , 5 As shown in the figure, the second oil outlet 32 of the switching electromagnetic valve 3 is connected to the oil inlet of the machine operating handle and foot valve 7;

[0026] Reference Figure 2 , 6 As shown in the figure, the shuttle valve assembly 5 is provided in a plurality of, the number is the same as that of the proportional pressure reducing valve, and the shuttle valve oil outlet 53 of the shuttle valve assembly 5 is connected to the spool pilot oil port of the main control valve 6;

[0027] Reference Figure 4 , 6 As shown in the figure, the oil outlet of each proportional pressure reducing valve in the proportional pressure reducing valve group 4 is connected to the shuttle valve first oil inlet 51 of one shuttle valve assembly 5;

[0028] Reference Figure 5 , 6 As shown in the figure, the shuttle valve second oil inlet 52 of the shuttle valve assembly 5 is connected to the oil outlet of the machine operating handle and foot valve 7;

[0029] The machine operation and remote operation switching function is realized by energizing and de-energizing the electromagnet of the switching electromagnetic valve 3:

[0030] The specific working principle is:

[0031] When the electromagnet of the safety electromagnetic valve 2 is energized and opened, the pressure oil output by the pilot pump 1 will enter the oil inlet of the switching electromagnetic valve 3 after passing through the safety electromagnetic valve 2;

[0032] When the electromagnet of the switching electromagnetic valve 3 is energized, the pressure oil enters the remote proportional pressure reducing valve group 4 through the first oil outlet 31; under the control signal output by the remote controller, each proportional pressure reducing valve of the remote proportional pressure reducing valve group 4 will output corresponding pressure oil according to the remote operation instruction, wherein the proportional pressure reducing valve outlet pressure is proportional to the control signal, that is, the greater the control signal, the greater the output pressure, the greater the main control valve output flow, and the faster the action;

[0033] The pressure oil outputted by each proportional valve will enter the first oil inlet 51 of the corresponding shuttle valve, at this time, the pressure of the local operation handle and the foot valve 7 oil outlet connected with the second oil inlet 52 of the shuttle valve is zero, under the action of hydraulic pressure, the oil outlet 53 of the shuttle valve is connected with the first oil inlet 51 of the shuttle valve, and at the same time, the oil outlet 53 of the shuttle valve is connected with the valve core pilot oil port of the main control valve 6, so that the remote control operation of the whole machine is realized.

[0034] If the electromagnet of the switching electromagnetic valve 3 is powered off, the pressure oil enters the local operation handle and the foot valve 7 oil inlet through the second oil outlet 32, and the pressure oil outputted by each local operation handle and the foot valve 7 will be adjusted according to the operation amplitude of the operator; the pressure oil outputted by the local operation handle and the foot valve 7 is connected with the second oil inlet 52 of the shuttle valve, at this time, the pressure of the remote control proportional pressure reducing valve oil outlet connected with the first oil inlet 51 of the shuttle valve is zero, under the action of hydraulic pressure, the oil outlet 53 of the shuttle valve is connected with the second oil inlet 52 of the shuttle valve, and then the local operation of the whole machine is realized.

[0035] Beneficial effects are:

[0036] The utility model discloses a quick realization remote control function on traditional hydraulic excavator, has the characteristics such as clever design, reasonable in structure, convenient to use, strong practicality, is applicable on different tonnage hydraulic excavator.

[0037] Obviously, all the above descriptions and drawings should be understood as exemplary, and are not limited to the utility model. For example, the principle of the local operation hydraulic system of the excavator involved in the utility model is different, or the number of proportional pressure reducing valves included in the remote control proportional pressure reducing valve group 3 is different, or other auxiliary functions of the whole machine need to realize remote control operation and local operation coexist, etc. Obviously, these different schemes should be included in the scope of the utility model.

[0038] It should be noted that the above terms "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. The terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. The meaning of "a plurality of" is two or more. "Mounting", "connection" and "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected.

[0039] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form or in essence. It should be noted that those skilled in the art can make some improvements and supplements without departing from the present application, and these improvements and supplements should also be considered as the protection scope of the present application. Any equivalent changes, modifications and evolutions made by those skilled in the art without departing from the spirit and scope of the present application, and all equivalent embodiments of the present application, are still within the scope of the technical solutions of the present application.

Claims

1. A remotely controlled hydraulic excavator pilot system, characterized in that, The application relates to a remote control proportional pressure reducing valve group, which comprises a pilot pump (1), an inlet of a safety electromagnetic valve (2) connected with an outlet of the pilot pump (1), an inlet of a switching electromagnetic valve (3) connected with an outlet of the safety electromagnetic valve (2), a first outlet (31) of the switching electromagnetic valve (3) connected with an inlet of a remote control proportional pressure reducing valve group (4), a second outlet (32) of the switching electromagnetic valve (3) connected with an inlet of a local operation handle and a foot valve (7), an outlet of the remote control proportional pressure reducing valve group (4) connected with a shuttle valve first inlet (51) of a shuttle valve assembly (5), a shuttle valve second inlet (52) of the shuttle valve assembly (5) connected with an outlet of the local operation handle and the foot valve (7), and a shuttle valve outlet (53) of the shuttle valve assembly (5) connected with a valve core pilot oil port of a main control valve (6).

2. The remotely controlled hydraulic excavator pilot system of claim 1, wherein, The remote control controller outputs an on-off signal to the safety electromagnetic valve (2).

3. The remotely controlled hydraulic excavator pilot system of claim 2, wherein, The remote control controller outputs an on-off signal to the switching electromagnetic valve (3).

4. The remotely controlled hydraulic excavator pilot system of claim 2, wherein, The remote control controller outputs a control signal to the proportional pressure reducing valve group (4).

5. The remotely controlled hydraulic excavator pilot system of claim 4, wherein, The remote control controller outputs a control signal in a proportional relationship with an outlet pressure of the proportional pressure reducing valve group (4).

6. The remotely controlled hydraulic excavator pilot system of claim 1, wherein, The remote control proportional pressure reducing valve group (4) comprises a plurality of proportional pressure reducing valves.

7. The remotely controlled hydraulic excavator pilot system of claim 6, wherein, The shuttle valve assembly (5) is provided in a plurality of numbers, and the number is the same as that of the proportional pressure reducing valves.

8. The remotely controlled hydraulic excavator pilot system of claim 7, wherein, The outlet of the proportional pressure reducing valve is connected with the shuttle valve first inlet (51) of the shuttle valve assembly (5).

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