Functional module for single-action actuating mechanism

Abstract

The functional module comprises an oil inlet main path and an oil return main path, the oil inlet main path and the oil return main path are both used for being communicated with a rodless cavity of the single-action executing mechanism, the functional module further comprises a plurality of electromagnetic valves, oil inlets of the electromagnetic valves are all communicated with the oil inlet main path, and oil outlets of the electromagnetic valves are communicated with the oil return main path. Oil return ports of the plurality of electromagnetic valves are communicated with the oil return main path; an oil outlet of each electromagnetic valve is connected with inlets of any two different shuttle valves at the same time, so that it is ensured that when any electromagnetic valve is powered off, hydraulic oil normally enters the corresponding two-way valve from each shuttle valve, and control ports of the two-way valves communicate with outlets of the shuttle valves in a one-to-one correspondence mode; and two side ports of the plurality of two-way valves are respectively communicated with the rodless cavity and the oil return main path. Quick action control over the single-action executing mechanism is achieved through power loss of any two electromagnetic valves, loss caused by faults of a single electromagnetic valve is avoided, and the working stability of the whole functional module is improved.

Description

Technical Field

[0001] The present invention relates to the field of single-acting actuators, and particularly to a functional module for a single-acting actuator. Background Art

[0002] A single-acting actuator, such as a single-acting hydraulic cylinder, includes: a cylinder block, a piston, and a piston rod. The piston rod is disposed within the cylinder block. One end of the piston is connected to the piston, and the other end extends out of the cylinder block. The oil port of the single-acting hydraulic cylinder is opened at the rodless cavity end of the cylinder block. The piston of the hydraulic cylinder extends when oil enters the oil port and retracts under an external force.

[0003] When a single-acting hydraulic cylinder needs to perform a fast action, it is necessary to cut off the oil pressure supply in a timely manner. At this time, the single-acting hydraulic cylinder automatically resets by means of an internal elastic member and discharges the hydraulic oil inside the rodless cavity. In order to be able to cut off the supply of hydraulic oil in a timely manner and discharge the hydraulic oil inside the rodless cavity and the main oil inlet path in a timely manner, in the prior art, a return oil main path is generally provided beside the main oil inlet path to timely return the hydraulic oil in the main oil inlet path and the rodless cavity to the fuel tank, and a single solenoid valve is provided on the return oil main path to control the on / off of the return oil main path. The defect of this solution is that when a single solenoid valve loses power due to a failure, it will mislead the connection between the main oil inlet path and the return oil main path, and then cause the fast action condition of the single-acting hydraulic cylinder to be misstarted, resulting in losses. Therefore, the stability of the operating condition of the entire system is relatively low. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a functional module for a single-acting actuator. By using the method of controlling the fast action of the single-acting actuator when any two solenoid valves lose power, losses caused by a single solenoid valve failure are avoided, and the stability of the operation of the entire functional module is improved.

[0005] The present invention is realized through the following technical solutions:

[0006] A functional module for a single-acting actuator includes a main oil inlet path and a return oil main path. Both the main oil inlet path and the return oil main path are used to communicate with the rodless cavity of the single-acting actuator. An elastic member is disposed within the rod chamber of the single-acting actuator, and one end of the elastic member abuts against the piston and the other end abuts against the inner wall of the single-acting actuator; further includes:

[0007] A plurality of solenoid valves, including a first solenoid valve, a second solenoid valve, and a third solenoid valve. The oil inlets of the plurality of solenoid valves are all communicated with the main oil inlet path, and the oil outlets of the plurality of solenoid valves are all communicated with the return oil main path;

[0008] Multiple shuttle valves, including a first shuttle valve, a second shuttle valve and a third shuttle valve. The oil outlet of the first solenoid valve is simultaneously communicated with the first inlet of the first shuttle valve and the first inlet of the third shuttle valve. The oil outlet of the second solenoid valve is simultaneously communicated with the second inlet of the first shuttle valve and the first inlet of the second shuttle valve. The oil outlet of the third solenoid valve is simultaneously communicated with the second inlet of the second shuttle valve and the second inlet of the third shuttle valve;

[0009] Multiple two-way valves, including a first two-way valve, a second two-way valve and a third two-way valve. The control port of the first two-way valve is communicated with the outlet of the first shuttle valve. The control port of the second two-way valve is communicated with the outlet of the third shuttle valve. The control port of the third two-way valve is communicated with the outlet of the second shuttle valve. Both side ports of the first two-way valve, the second two-way valve and the third two-way valve are respectively communicated with the main oil inlet path and the main oil return path;

[0010] Further, an oil inlet branch and an oil return branch are further included. The oil inlet branch is communicated with the main oil inlet path. The oil return branch is communicated with the main oil return path. The oil inlets of multiple solenoid valves are all communicated with the oil inlet branch. The oil return ports of multiple solenoid valves are all communicated with the oil return branch.

[0011] Further, the pipeline distance between the first inlet of the shuttle valve and the oil inlet P of the main oil inlet path is not equal to the pipeline distance between the second inlet of the shuttle valve and the oil inlet P of the main oil inlet path.

[0012] Further, a first main oil return path is further included. The first main oil return path is communicated with the main oil inlet path. One side port of multiple two-way valves is all communicated with the first main oil return path. The other side port of multiple two-way valves is all communicated with the oil return branch.

[0013] Further, a second main oil return path is further included. The second main oil return path is simultaneously communicated with the other side port of multiple two-way valves and the oil return branch.

[0014] Further, the first solenoid valve, the second solenoid valve and the third solenoid valve are all two-position three-way solenoid valves.

[0015] Compared with the prior art, the advantages of the present invention are as follows:

[0016] In the functional module provided by the present application, when a single solenoid valve loses power due to a fault, the normal working condition of the single-acting actuator can still be ensured. Only when two or three solenoid valves fail simultaneously, it will cause the functional module to mis-start the fast action working condition of the single-acting actuator, greatly reducing the probability of mis-starting, avoiding losses caused by a single solenoid valve failure, and improving the working stability of the entire fast functional module. Description of the Drawings

[0017] Figure 1 It is a structural schematic diagram of a functional module for a single-acting actuator.

[0018] 1. Main oil inlet path; 11. Oil inlet branch path; 2. Main oil return path; 21. Oil return branch path; 22. First oil return main path; 23. Second oil return main path; 3. Single-acting actuator; 30. Rodless cavity; 31. Rod cavity; 32. Elastic member; 33. Piston; 41. First solenoid valve; 42. Second solenoid valve; 43. Third solenoid valve; 51. First shuttle valve; 52. Second shuttle valve; 53. Third shuttle valve; 61. First two-way valve; 62. Second two-way valve; 63. Third two-way valve. Detailed implementation manners

[0019] The technical solution of the invention will be further described in detail in a non-limiting manner below in conjunction with the preferred embodiments and their accompanying drawings. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation of the present invention.

[0020] As Figure 1As shown in the figure, a functional module for a single-acting actuator according to an embodiment of the present invention includes an oil inlet main path 1 and an oil return main path 2. Both the oil inlet main path 1 and the oil return main path 2 are used to communicate with the rodless cavity 30 of the single-acting actuator 3. An elastic member 32 is disposed in the rod cavity 31 of the single-acting actuator 3, and one end of the elastic member 32 abuts against the piston 33 and the other end abuts against the inner wall of the single-acting actuator 3. The functional module further includes a plurality of solenoid valves, a plurality of shuttle valves, and a plurality of two-way valves. The plurality of solenoid valves include a first solenoid valve 41, a second solenoid valve 42, and a third solenoid valve 43. The oil inlet ports of the plurality of solenoid valves are all communicated with the oil inlet main path 1, and the oil return ports of the plurality of solenoid valves are all communicated with the oil return main path 2. The plurality of shuttle valves include a first shuttle valve 51, a second shuttle valve 52, and a third shuttle valve 53. The oil outlet of the first solenoid valve 41 is simultaneously communicated with the first inlet of the first shuttle valve 51 and the first inlet of the third shuttle valve 53. The oil outlet of the second solenoid valve 42 is simultaneously communicated with the second inlet of the first shuttle valve 51 and the first inlet of the second shuttle valve 52. The oil outlet of the third solenoid valve 43 is simultaneously communicated with the second inlet of the second shuttle valve 52 and the second inlet of the third shuttle valve 53. The plurality of two-way valves include a first two-way valve 61, a second two-way valve 62, and a third two-way valve 63. The control port of the first two-way valve 61 is communicated with the outlet of the first shuttle valve 51. The control port of the second two-way valve 62 is communicated with the outlet of the third shuttle valve 53. The control port of the third two-way valve 63 is communicated with the outlet of the second shuttle valve 52. The two side ports of the first two-way valve 61, the second two-way valve 62, and the third two-way valve 63 are respectively communicated with the oil inlet main path 1 and the oil return main path 2.

[0021] The functional module further includes an oil inlet branch 11 and an oil return branch 21. The oil inlet branch 11 is communicated with the oil inlet main path 1, and the oil return branch 21 is communicated with the oil return main path 2. The oil inlet ports of the plurality of solenoid valves are all communicated with the oil inlet branch 11, and the oil return ports of the plurality of solenoid valves are all communicated with the oil return branch 21.

[0022] The functional module further includes a first oil return main path 22. The first oil return main path 22 is communicated with the oil inlet main path 1. One side port of the plurality of two-way valves is all communicated with the first oil return main path 22, and the other side port of the plurality of two-way valves is all communicated with the oil return branch 21.

[0023] The functional module further includes a second oil return main path 23. The second oil return main path 23 is simultaneously communicated with the other side port of the plurality of two-way valves and the oil return branch 21.

[0024] The pipeline distance between the first inlet of the shuttle valve and the oil inlet P of the oil inlet main path 1 is not equal to the pipeline distance between the second inlet of the shuttle valve and the oil inlet P of the oil inlet main path 1, so as to prevent the two inlets of the same shuttle valve from simultaneously entering oil, resulting in abnormal oil outlet at the outlet of the shuttle valve.

[0025] In this embodiment, the first solenoid valve 41, the second solenoid valve 42, and the third solenoid valve 43 are all two-position three-way solenoid valves.

[0026] The working principle of the present invention is as follows:

[0027] Under normal conditions, the first solenoid valve 41, the second solenoid valve 42, and the third solenoid valve 43 are all energized. The hydraulic oil flows through the first solenoid valve 41, the second solenoid valve 42, and the third solenoid valve 43 respectively to the corresponding shuttle valves, and flows out from the outlets of the shuttle valves. The hydraulic oil flowing out from the shuttle valves flows to the control ports of the corresponding two-way valves respectively, so that the three two-way valves are in a blocked state, that is, the two side ports of the two-way valve are not connected to each other. At this time, the hydraulic oil enters from the oil inlet P port, passes through the main oil inlet path 1 to the rodless cavity 30, and the hydraulic oil discharged from the rodless cavity 30 passes through the main oil inlet path 1 and is discharged from the oil inlet P port.

[0028] When any one of the three solenoid valves is de-energized, there is still hydraulic oil passing through the three shuttle valves, and the three two-way valves are still in a blocked state. The working state of the single-acting actuator 3 remains unchanged, and the single-acting actuator 3 is still in a normal working state.

[0029] When two or more of the three solenoid valves are de-energized, assuming that the first solenoid valve 41 and the second solenoid valve 42 are de-energized, the hydraulic oil only flows out from the third solenoid valve 43. At this time, only the second shuttle valve 52 and the third shuttle valve 53 connected to the third solenoid valve 43 have hydraulic oil flowing out. At this time, the second two-way valve 62 and the third two-way valve 63 are in a blocked state, and the first two-way valve 61 is in a connected state. At this time, the rodless cavity 30 of the single-acting actuator 3 is connected to the oil return main path 2 through the first two-way valve 61. At this time, the hydraulic oil in the main oil inlet path 1 and the rodless cavity flows back to the fuel tank through the oil return main path 2, so that the single-acting actuator 3 is reset under the action of the internal elastic member 32 and is in a fast-action state.

[0030] The beneficial effects of the present invention are as follows:

[0031] When a single solenoid valve is de-energized due to a fault, the normal working condition of the single-acting actuator can still be ensured. Only when two or three solenoid valves fail simultaneously, it will cause the fast-action working condition of the function module to mis-start the single-acting actuator, greatly reducing the probability of mis-start, avoiding losses caused by a single electromagnetic fault, and improving the working stability of the entire fast function module.

[0032] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A functional module for a single-acting actuator, comprising an oil inlet main path (1) and an oil return main path (2), both the oil inlet main path (1) and the oil return main path (2) are used to communicate with the rodless cavity (30) of the single-acting actuator (3), an elastic member (32) is arranged in the rod cavity (31) of the single-acting actuator (3), and one end of the elastic member (32) abuts against the piston (33) and the other end abuts against the inner wall of the single-acting actuator (3); characterized in that, Further comprising: A plurality of solenoid valves, including a first solenoid valve (41), a second solenoid valve (42), and a third solenoid valve (43), and the oil inlets of the plurality of solenoid valves are all communicated with the main oil inlet path (1), and the oil return ports of the plurality of solenoid valves are all communicated with the main oil return path (2); A plurality of shuttle valves, including a first shuttle valve (51), a second shuttle valve (52), and a third shuttle valve (53), the oil outlet of the first solenoid valve (41) is simultaneously communicated with the first inlet of the first shuttle valve (51) and the first inlet of the third shuttle valve (53), the oil outlet of the second solenoid valve (42) is simultaneously communicated with the second inlet of the first shuttle valve (51) and the first inlet of the second shuttle valve (52), and the oil outlet of the third solenoid valve (43) is simultaneously communicated with the second inlet of the second shuttle valve (52) and the second inlet of the third shuttle valve (53); A plurality of two-way valves, including a first two-way valve (61), a second two-way valve (62), and a third two-way valve (63), the control port of the first two-way valve (61) is communicated with the outlet of the first shuttle valve (51), the control port of the second two-way valve (62) is communicated with the outlet of the third shuttle valve (53), and the control port of the third two-way valve (63) is communicated with the outlet of the second shuttle valve (52); both side ports of the first two-way valve (61), the second two-way valve (62), and the third two-way valve (63) are respectively communicated with the main oil inlet path (1) and the main oil return path (2).

2. The functional module for a single-acting actuator according to claim 1, characterized in that, Further comprising an oil inlet branch (11) and an oil return branch (21), the oil inlet branch (11) is communicated with the main oil inlet path (1), the oil return branch (21) is communicated with the main oil return path (2), and the oil inlets of the plurality of solenoid valves are all communicated with the oil inlet branch (11), and the oil return ports of the plurality of solenoid valves are all communicated with the oil return branch (21).

3. The functional module for a single-acting actuator according to claim 1, characterized in that, The pipeline distance between the first inlet of the shuttle valve and the oil inlet P of the main oil inlet path (1) is not equal to the pipeline distance between the second inlet of the shuttle valve and the oil inlet P of the main oil inlet path (1).

4. The functional module for a single-acting actuator according to claim 2, characterized in that, Further comprising a first main oil return path (22), the first main oil return path (22) is communicated with the main oil inlet path (1), one side port of each of the plurality of two-way valves is communicated with the first main oil return path (22), and the other side port of each of the plurality of two-way valves is communicated with the oil return branch (21).

5. The functional module for a single-acting actuator according to claim 4, characterized in that, Further comprising a second main oil return path (23), the second main oil return path (23) is simultaneously communicated with the other side ports of the plurality of two-way valves and the oil return branch (21).

6. The functional module for a single-acting actuator according to claim 1, characterized in that, The first solenoid valve (41), the second solenoid valve (42), and the third solenoid valve (43) are all two-position three-way solenoid valves.

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