Safety module for double-acting actuating mechanism
By combining multiple solenoid valves and shuttle valves, the problem of false start-up of double-acting actuators caused by the failure of a single solenoid valve is solved, achieving higher system stability and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU DANDUN ELECTROMECHANICAL CO LTD
- Filing Date
- 2025-06-05
- Publication Date
- 2026-05-01
AI Technical Summary
In the existing technology, a single solenoid valve failure can cause a double-acting actuator to malfunction and start rapidly, resulting in losses and low system stability.
The system employs a combination design of multiple solenoid valves and shuttle valves to ensure that it can maintain normal operation even when a single solenoid valve loses power. It only causes false start-up when two or three solenoid valves fail simultaneously, thus improving system stability.
This greatly reduces the probability of accidental activation, avoids losses caused by the failure of a single solenoid valve, and improves the operational stability of the safety module.
Smart Images
Figure CN224187823U_ABST
Abstract
Description
A safety module for a double-acting actuator Technical Field
[0001] This utility model relates to the field of double-acting actuators, and in particular to a safety module for double-acting actuators. Background Technology
[0002] In industrial hydraulic systems, the operating conditions of double-acting actuators generally include normal operating conditions and rapid-action operating conditions. During normal operating conditions, the reciprocating motion of the internal piston is achieved by inputting / discharging hydraulic oil into the rod-side and rodless-side chambers of the double-acting actuator. During rapid-action operating conditions, the rod-side and rodless-side chambers of the double-acting actuator need to be interconnected to balance the oil pressure on both sides. The internal piston of the double-acting actuator relies on its internal elastic element for reset. In existing technology, a single solenoid valve typically controls a single two-way valve to achieve the connection or disconnection of the rod-side and rodless-side chambers of the double-acting actuator. The drawback of this approach is that when the single solenoid valve fails to power, the two-way valve will connect the rod-side and rodless-side chambers of the double-acting actuator, leading to the accidental activation of the rapid-action operating condition of the double-acting actuator, resulting in losses. Therefore, the overall system operating conditions have low stability. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this utility model provides a safety module for a double-acting actuator. This safety module avoids damage caused by the failure of a single solenoid valve by controlling the rapid action of the double-acting actuator through the de-energization of any two solenoid valves, thereby improving the overall stability of the safety module.
[0004] This utility model is achieved through the following technical solution:
[0005] A safety module for a double-acting actuator includes an oil inlet main line and an oil return main line. The oil inlet main line connects to the rodless chamber of the double-acting actuator, and the oil return main line connects to the rod-operated chamber of the double-acting actuator. The module also includes:
[0006] Multiple solenoid valves, including a first solenoid valve, a second solenoid valve, and a third solenoid valve, wherein the oil inlet of each of the multiple solenoid valves is connected to the main oil inlet circuit, and the oil return port of each of the multiple solenoid valves is connected to the main oil return circuit.
[0007] Multiple shuttle valves, including a first shuttle valve, a second shuttle valve and a third shuttle valve, wherein the oil outlet of the first solenoid valve is simultaneously connected to 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 connected to the second inlet of the first shuttle valve and the first inlet of the second shuttle valve, and the oil outlet of the third solenoid valve is simultaneously connected to the second inlet of the second shuttle valve and the second inlet of the third shuttle valve.
[0008] Multiple two-way valves, including a first two-way valve, a second two-way valve, and a third two-way valve, wherein the control port of the first two-way valve is connected to the outlet of the first shuttle valve, the control port of the second two-way valve is connected to the outlet of the third shuttle valve, and the control port of the third two-way valve is connected to 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 connected to the rodless chamber and the rod chamber.
[0009] Furthermore, it also includes an oil inlet branch and an oil return branch, wherein the oil inlet branch is connected to the main oil inlet, the oil return branch is connected to the main oil return, and the oil inlets of the plurality of solenoid valves are all connected to the oil inlet branch, and the oil return ports of the plurality of solenoid valves are all connected to the oil return branch.
[0010] Furthermore, the pipeline distance between the first inlet of the shuttle valve and the oil inlet P of the main oil inlet 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.
[0011] Furthermore, it also includes a first branch and a second branch, the first branch being connected to the rod-side cavity and the second branch being connected to the rodless cavity, and the two side ports of the first two-way valve, the second two-way valve and the third two-way valve being connected to the first branch and the second branch, respectively.
[0012] Furthermore, the plurality of two-way valves also include a fourth two-way valve, the control port of which is connected to the outlet of the first shuttle valve, one side port of which is connected to the second branch and the other side port of which is connected to the return oil main line.
[0013] Furthermore, the plurality of two-way valves also include a fifth two-way valve, the control port of which is connected to the outlet of the second shuttle valve, one side port of which is connected to the second branch, and the other side port of which is connected to the return oil main.
[0014] Furthermore, the plurality of two-way valves also include a sixth two-way valve, the control port of which is connected to the outlet of the third shuttle valve, one side port of which is connected to the second branch and the other side port of which is connected to the return oil main.
[0015] Furthermore, the first solenoid valve, the second solenoid valve, and the third solenoid valve are all two-position three-way solenoid valves.
[0016] Compared with existing technologies, the advantages of this utility model are:
[0017] In the safety module provided in this application, even if a single solenoid valve loses power due to a malfunction, the normal operation of the double-acting actuator can still be guaranteed. Only when two or three solenoid valves malfunction simultaneously will the control circuit be prone to false start and rapid action, which greatly reduces the probability of false start, avoids losses caused by the failure of a single solenoid valve, and improves the stability of the entire safety module. Attached Figure Description
[0018] Figure 1 is a schematic diagram of a safety module for a dual-acting actuator according to an embodiment of the present invention.
[0019] 1. Main oil inlet line; 11. Branch oil inlet line; 12. First branch line; 2. Main oil return line; 21. Branch oil return line; 22. Second branch line; 3. Hydraulic actuator; 30. Rodless chamber; 31. Rod chamber; 32. Piston; 33. Elastic element; 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; 64. Fourth two-way valve; 65. Fifth two-way valve; 66. Sixth two-way valve. Detailed Implementation
[0020] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0021] As shown in Figure 1, a safety module for a double-acting actuator according to an embodiment of the present invention includes an oil inlet main line 1, an oil return main line 2, multiple solenoid valves, multiple shuttle valves, and multiple two-way valves. The oil inlet main line 1 is used to connect to the rodless chamber 30 of the double-acting actuator 3, and the oil return main line 2 is used to connect to the rod chamber 31 of the double-acting actuator 3. The multiple solenoid valves include a first solenoid valve 41, a second solenoid valve 42, and a third solenoid valve 43, and the oil inlets of the multiple solenoid valves are all connected to the oil inlet main line 1, and the oil return ports of the multiple solenoid valves are all connected to the oil return main line 2. The multiple 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 connected to 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 connected to 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 connected to the second inlet of the first shuttle valve 51 and the first inlet of the second shuttle valve 53. The oil outlet of valve 3 is simultaneously connected to the second inlet of the second shuttle valve 52 and the second inlet of the third shuttle valve 53; multiple 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 connected to the outlet of the first shuttle valve 51, the control port of the second two-way valve 62 is connected to the outlet of the third shuttle valve 53, and the control port of the third two-way valve 63 is connected to 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 connected to the rodless chamber 30 and the rod chamber 31.
[0022] In this embodiment, the double-acting actuator has a spring reset function, and can be selected as normally open or normally closed according to the working conditions. When the double-acting actuator is in a rapid action condition, the oil pressure on both sides of the rod chamber 31 and the rodless chamber 30 is balanced, and the piston 32 inside the double-acting actuator is reset by the elastic element 33. In this embodiment, the piston 32 is located at the rightmost side of the chamber under the action of the elastic element 33, so that the double-acting actuator continues to maintain the rapid action condition.
[0023] The safety module also includes an oil inlet branch 11 and an oil return branch 21. The oil inlet branch 11 is connected to the main oil inlet 1, and the oil return branch 21 is connected to the main oil return 2. The oil inlets of multiple solenoid valves are connected to the oil inlet branch 11, and the oil return ports of multiple solenoid valves are connected to the oil return branch 21.
[0024] The pipeline distance between the first inlet of the shuttle valve and the inlet P of the main oil inlet line 1 is not equal to the pipeline distance between the second inlet of the shuttle valve and the inlet P of the main oil inlet line 1, so as to avoid the shuttle valve outlet being unable to discharge oil normally due to the simultaneous intake of oil at the two inlets of the same shuttle valve.
[0025] The safety module also includes a first branch 12 and a second branch 22. The first branch 12 is connected to the rod chamber 31, and the second branch 22 is connected to the rodless chamber 30. 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 connected to the first branch 12 and the second branch 22.
[0026] The multiple two-way valves also include a fourth two-way valve 64, a fifth two-way valve 65, and a sixth two-way valve 66. The control port of the fourth two-way valve 64 is connected to the outlet of the first shuttle valve 51, one port of the fourth two-way valve 64 is connected to the second branch 22, and the other port is connected to the main return oil line 2. The control port of the fifth two-way valve 65 is connected to the outlet of the second shuttle valve 52, one port of the fifth two-way valve 65 is connected to the second branch 22, and the other port is connected to the main return oil line 2. The control port of the sixth two-way valve 66 is connected to the outlet of the third shuttle valve 53, one port of the sixth two-way valve 66 is connected to the second branch 22, and the other port is connected to the main return oil line 2. The purpose of setting the fourth two-way valve 64, the fifth two-way valve 65, and the sixth two-way valve 66 is to drain excess hydraulic oil. Referring to Figure 1, when the double-acting actuator 3 is in a rapid action state, when the piston rod moves to the right, the space of the rodless chamber 30 becomes smaller. The hydraulic oil discharged from the rodless chamber 30 flows back to the rod chamber 31 through the first two-way valve 61 and / or the second two-way valve 62 and / or the third two-way valve 63. Since the piston rod occupies a certain space in the rod chamber 31, the rod chamber 31 can only accept part of the hydraulic oil discharged from the rodless chamber 30, while the excess hydraulic oil flows back to the main return line 2 through the fourth two-way valve 64 and / or the fifth two-way valve 65 and / or the sixth two-way valve 66.
[0027] 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.
[0028] The working principle of this utility model is as follows:
[0029] 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 to the corresponding shuttle valves and flows out from the outlet of the shuttle valves. The hydraulic oil flowing out from the shuttle valves flows to the control ports of the corresponding two-way valves, so that the two-way valves are in a blocked state, that is, the two side ports of the two-way valves 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 1, and reaches the rodless chamber 30. The hydraulic oil discharged from the rod chamber 31 is discharged from the oil outlet T port through the main oil return 2.
[0030] When any one of the three solenoid valves is de-energized, hydraulic oil still flows through the three shuttle valves, the three two-way valves remain blocked, the working state of the double-acting actuator 3 remains unchanged, and the double-acting actuator 3 remains in normal working condition.
[0031] When two or more of the three solenoid valves are de-energized, assuming the first solenoid valve 41 and the second solenoid valve 42 are de-energized, hydraulic oil flows out only 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 chamber 30 and the rod chamber 31 of the double-acting actuator 3 are connected through the first two-way valve 61. At this time, the oil pressure on both sides is balanced, and the double-acting actuator 3 resets the piston by its internal elastic element, so that the double-acting actuator 3 is in a rapid action state.
[0032] The beneficial effects of this utility model are as follows:
[0033] Even when a single solenoid valve loses power due to a malfunction, the normal operation of the double-acting actuator can still be guaranteed. Only when two or three solenoid valves malfunction simultaneously will the control circuit malfunction and rapidly activate. This greatly reduces the probability of malfunction, avoids losses caused by the failure of a single solenoid valve, and improves the stability of the entire safety module.
[0034] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A safety module for a double-acting actuator, comprising an oil inlet main line (1) and an oil return main line (2), wherein the oil inlet main line (1) is used to connect to the rodless cavity (30) of the double-acting actuator (3), and the oil return main line (2) is used to connect to the rod cavity (31) of the double-acting actuator (3), characterized in that, It also includes: multiple solenoid valves, including a first solenoid valve (41), a second solenoid valve (42), and a third solenoid valve (43), wherein the oil inlets of the multiple solenoid valves are all connected to the main oil inlet (1), and the oil return ports of the multiple solenoid valves are all connected to the main oil return (2); multiple shuttle valves, including a first shuttle valve (51), a second shuttle valve (52), and a third shuttle valve (53), wherein the oil outlet of the first solenoid valve (41) is simultaneously connected to 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 connected to 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 connected to the second inlet of the first shuttle valve (51) and the first inlet of the second shuttle valve (53 ... second solenoid valve (42) is simultaneously connected to the second inlet of the first shuttle valve (51) and the first inlet of the second shuttle valve (53), and the oil outlet of the third solenoid valve (43) is connected to the first inlet of the third shuttle valve (43). 3) The oil outlet is simultaneously connected to the second inlet of the second shuttle valve (52) and the second inlet of the third shuttle valve (53); multiple 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 connected to the outlet of the first shuttle valve (51), the control port of the second two-way valve (62) is connected to the outlet of the third shuttle valve (53), and the control port of the third two-way valve (63) is connected to 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 connected to the rodless chamber (30) and the rod chamber (31).
2. The security module according to claim 1, characterized in that, It also includes an oil inlet branch (11) and an oil return branch (21), wherein the oil inlet branch (11) is connected to the main oil inlet (1), the oil return branch (21) is connected to the main oil return (2), and the oil inlets of the plurality of solenoid valves are all connected to the oil inlet branch (11), and the oil return ports of the plurality of solenoid valves are all connected to the oil return branch (21).
3. The security module according to claim 2, characterized in that, The pipeline distance between the first inlet of the shuttle valve and the inlet P of the main oil inlet (1) is not equal to the pipeline distance between the second inlet of the shuttle valve and the inlet P of the main oil inlet (1).
4. The security module according to claim 2, characterized in that, It also includes a first branch (12) and a second branch (22), the first branch (12) being connected to the rod chamber (31), the second branch (22) being connected to the rodless chamber (30), and the two side ports of the first two-way valve (61), the second two-way valve (62) and the third two-way valve (63) being connected to the first branch (12) and the second branch (22) respectively.
5. The security module according to claim 4, characterized in that, The plurality of two-way valves also include a fourth two-way valve (64), the control port of which is connected to the outlet of the first shuttle valve (51), one side port of which is connected to the second branch (22) and the other side port is connected to the return oil main (2).
6. The security module according to claim 4, characterized in that, The plurality of two-way valves also include a fifth two-way valve (65), the control port of which is connected to the outlet of the second shuttle valve (52), one side port of which is connected to the second branch (22) and the other side port is connected to the return oil main (2).
7. The security module according to claim 4, characterized in that, The plurality of two-way valves also include a sixth two-way valve (66), the control port of which is connected to the outlet of the third shuttle valve (53), one side port of which is connected to the second branch (22) and the other side port is connected to the return oil main line (2).
8. The security module according to claim 7, 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.