Self-locking valve applied to safety dual valve

Abstract

The invention provides a self-locking valve applied to a safety dual valve, the self-locking valve is fixedly arranged at the lower end of the safety dual valve, the self-locking valve comprises a shell, a movable cavity is formed in the shell, and a balance piston is movably arranged in the movable cavity; the left side and the right side of the movable cavity are provided with air channels communicated with an air inlet chamber of the safety duplex valve, a damping hole is formed in the length direction of the balance piston in a penetrating mode, and elastic assemblies are fixedly arranged between the left side and the right side of the balance piston and the inner wall of the movable cavity. The self-locking valve is additionally arranged at the bottom of the safety dual valve, so that the condition for realizing the main safety function of the dual valve in a single fault state is ensured; the purposes that the safety function of the safety dual valve in the fault accumulation state is achieved through a pneumatic logic control loop method, and redundancy control is achieved through the main safety function of the safety dual valve in the fault accumulation state through a mechanical method are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of safety double valves, and in particular to a self-locking valve applied to a safety double valve. Background Art

[0002] Currently, both domestic and international markets use duplex valves to control the friction clutch operation of pneumatic friction clutch presses. In principle, a duplex valve is composed of two sets of two-position, three-way, single solenoid valves connected directly in parallel or in a cross-mirror manner at the inlet, outlet, and exhaust ports. When the coils of the two solenoid valves are simultaneously energized and de-energized, they switch directions simultaneously, and the duplex valve operates normally like a single, two-position, three-way, single solenoid valve. If one of the main valve cores fails to open or close properly, the internal structure of the duplex valve ensures that almost all compressed air entering the duplex valve is discharged through the exhaust port, disengaging the press clutch and providing a safety protection. This is the main safety function of the duplex valve. While the probability of both valve cores failing simultaneously during the operating cycle is low, the probability of any single channel in the safety duplex valve and its control system failing is higher, requiring complete inspection of the duplex valve during maintenance. Furthermore, a malfunctioning spool in the duplex valve can easily cause excessive internal pressure, potentially damaging the spool or air chamber. Existing double valves all use the input electrical signal method to activate the solenoid valve, thereby connecting the air inlet and the air outlet, and the double valve supplies air to the clutch or brake, and the press works normally. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the existing technology. The present invention proposes a self-locking valve applied to a safety double valve, which is used to ensure that when a single fault occurs in the safety double valve, the compressed air entering therein can be continuously discharged, thereby ensuring the internal safety of the safety double valve and avoiding leakage and system damage due to high pressure.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a self-locking valve applied to a safety double valve, the self-locking valve is fixedly arranged at the lower end of the safety double valve, including an outer shell, a movable cavity is opened in the outer shell, a balancing piston is movably arranged in the movable cavity, and air paths connected to the air inlet chamber of the safety double valve are opened on the left and right sides of the movable cavity, a damping hole is opened in the length direction of the balancing piston, and an elastic component is fixedly arranged between the left and right sides of the balancing piston and the inner wall of the movable cavity.

[0005] Furthermore, a valve core chamber is opened on the side of the balancing piston facing the air intake chamber, and the valve core chamber includes a first chamber section and a second chamber section. The depth of the first chamber section is smaller than that of the second chamber section, and is used to adapt to the movement range of the valve core; the first chamber section is close to the end of the balancing piston.

[0006] Further, the width of the second chamber section is not less than the sum of the width of the valve core and the distance between one side of the balance piston located at the center of the movable cavity and the movable cavity.

[0007] Further, the width of the first chamber section is not less than the width of the valve core.

[0008] Further, it further includes a self-locking rod assembly, the self-locking rod assembly is movably fixed on the housing, and a locking hole is provided on one side of the balance piston facing the self-locking rod assembly.

[0009] Further, it further includes a positioning convex block, the positioning convex block is fixedly arranged at the midline of the balance piston, locking holes are fixedly arranged on both sides of the positioning convex block, and the width of the positioning convex block is not less than the width of the self-locking rod assembly.

[0010] Further, the self-locking rod assembly includes a rod body, a handle fixed on the rod body, and a spring sleeved on the rod body. The spring is arranged in a cavity provided on the housing. One end of the spring contacts the inner wall of the cavity, and the other end is fixed by a push rod.

[0011] Further, first grooves for embedding the elastic component are provided at both ends of the balance piston, and second grooves for fixing the other end of the elastic component are provided on the two ends of the movable cavity facing the balance piston.

[0012] Further, the damping holes penetrate through the first grooves on both sides.

[0013] Further, a sealing ring is sleeved on the balance piston.

[0014] Compared with the prior art, the beneficial effects of the present invention include: by adding a self-locking valve at the bottom of the safety double check valve, it is ensured that when any one channel in the safety double check valve and its control system fails (referred to as a single failure), as long as the failure is not eliminated or not confirmed after elimination, no matter how many "power on, power off" signals are superimposed, the pressure at the output port of the safety double check valve is below the clutch driving pressure (≤0.04 MPa), and once again meets the conditions for the main safety function of the above safety double check valve to be realized by mechanical means in the state of cumulative failure; achieving the redundant control purpose of the safety double check valve to realize the safety function in the state of cumulative failure by using the pneumatic logic control circuit method and the main safety function in the state of cumulative failure by mechanical means. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 Schematically shows the top view structure of the self-locking valve applied to the safety double valve; Figure 2 Schematically shows the cross-sectional structure of the self-locking valve applied to the safety double valve.

[0016] Reference numerals in the figure: 1 - housing, 2 - movable cavity, 3 - balance piston, 4 - damping hole, 5 - elastic component, 6 - valve core chamber, 7 - first chamber section, 8 - second chamber section, 9 - self-locking rod assembly, 10 - locking hole, 11 - positioning convex block, 12 - rod body, 13 - handle, 14 - spring, 15 - ejector rod, 16 - first groove, 17 - second groove, 18 - sealing ring. Detailed implementation manners

[0017] It is easy to understand that according to the technical solution of the present invention, without changing the essence of the present invention, those of ordinary skill in the art can propose various replaceable structural ways and implementation manners. Therefore, the following detailed implementation manners and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0018] Figure 1 Schematically shows the top view structure of the self-locking valve applied to the safety double valve. A self-locking valve applied to the safety double valve is as Figure 1 shown. It is fixedly arranged at the lower end of the safety double valve to assist in realizing the safety function of the safety double valve in the state of cumulative failure. The aforementioned self-locking valve includes a housing 1. A movable cavity 2 is provided in the housing 1. A balance piston 3 is arranged in the movable cavity 2 and can reciprocate along the length direction of the movable cavity 2. Air passages communicating with the air inlet chamber of the safety double valve are provided on the left and right sides of the movable cavity 2. By introducing compressed gas into the air passages, the balance piston 3 located in the movable cavity 2 can reciprocate left and right in the movable cavity. It should be noted that a damping hole 4 is provided through the length direction of the aforementioned balance piston 3 to achieve a certain degree of air pressure balance on both sides of the balance piston 3. And an elastic component 5 is fixedly arranged between the left and right sides of the balance piston 3 and the inner wall of the movable cavity 2 to keep the balance piston 3 at the middle position of the movable cavity 2 under normal conditions.

[0019] Figure 2 Schematically shows the cross-sectional structure of the self-locking valve applied to the safety double valve, as Figure 2As shown in the figure, to prevent the safety double check valve from restarting operation without confirmation after a fault has not been eliminated or has been eliminated, a valve core chamber 6 is provided on the side of the aforementioned balance piston 3 facing the intake chamber. The valve core chamber 6 includes a first chamber section 7 and a second chamber section 8. The depth of the first chamber section 7 is less than that of the second chamber section 8. By setting the second chamber section 8, it is used to accommodate the extreme movement range of the valve core, and the first chamber section 7 is provided to block the downward movement of the valve core, and the first chamber section 7 is arranged near the end of the balance piston 3.

[0020] Specifically, since the valve core of the safety double check valve and the structures of related pilot solenoid valves are both arranged symmetrically in the safety double check valve, the aforementioned valve core chamber 6 is also symmetrically arranged on the balance piston 3 and is arranged corresponding to the position of the valve core. When any one of the channels of the safety double check valve fails (i.e., a single fault occurs), that is, any one of the pilot solenoid valves on the safety double check valve is in the energized state, and the other pilot solenoid valve is in the de-energized state. The valve core under the pilot solenoid valve in the energized state is in the downward pressure state, and its lower end extends into the aforementioned second chamber section 8. At this time, its intake chamber is communicated with the output chamber, so the compressed air entering from the intake chamber can be discharged from the output chamber; while the valve core under the pilot solenoid valve in the de-energized state does not fall, so the intake chamber and the output chamber are in a non-communicated state. Therefore, the compressed air entering this side of the intake chamber on the one hand inflates the pressure stabilizing air chamber connected to it, and on the other hand enters the movable cavity 2 through the air path, thereby pushing the balance piston 3 under the valve core of the energized pilot solenoid valve. At this time, the first chamber section 7 is exactly under the valve core under the pilot solenoid valve in the de-energized state to block its downward movement.

[0021] Furthermore, when the aforementioned pilot solenoid valve in the de-energized state is always in the de-energized state, the balance piston 3 in the movable cavity 2 always remains in this position, thus completing the limit of the valve core at this place. At this time, the residual pressure at the output port of the safety double check valve ≤ 0.04 MPa, which cannot drive the clutch. When the pilot solenoid valve in the de-energized state is repaired, the originally energized pilot solenoid valve is closed. After the valve core under it moves upward, the intake chamber and the output chamber are separated, so that during the continuous supply of compressed gas into the intake chamber, the air pressure on both sides of the balance piston 3 can be restored to balance. At this time, the balance piston 3 can return to the middle position of the movable cavity 2, and at this time the safety double check valve can be used normally.

[0022] For the convenience of the foregoing process, the width of the second chamber section 8 shall not be less than the sum of the width of the valve core and the distance between one side of the balance piston 3 and the movable cavity 2 when the balance piston 3 is located at the center of the movable cavity 2, so as to ensure that when one end of the balance piston 3 is closely attached to the inner wall of the movable cavity 2 due to the air pressure difference on both sides, the lower end of the valve core at this position can extend into the second chamber section 8. Therefore, the length of the second chamber section 8 shall meet the position requirements of the valve core when the balance piston 3 is at the extreme movement position. The width of the first chamber section 7 shall not be less than the width of the valve core or exactly equal to the width of the valve core, so that when one end of the balance piston 3 is closely attached to the inner wall of the movable cavity 2 due to the air pressure difference on both sides, the lower end of the valve core under the pilot solenoid valve in the de-energized state can be supported and limited by the first chamber section 7.

[0023] To ensure that the foregoing structure can restore the single fault state due to relevant operations, so that the safety double valve can return to the initial state and work in an abnormal state, and the safety function cannot be realized in the fault state. Therefore, a self-locking lever assembly 9 is provided on this basis. The fault state is locked by the self-locking lever assembly 9. As long as the fault is not manually eliminated or not confirmed after manual elimination, no matter how many "energized" or "de-energized" signals are superimposed, the pressure at the output port of the safety double valve is below the clutch driving pressure (≤0.04 MPa), meeting the conditions for realizing the main safety function of the safety double valve in the fault accumulation state.

[0024] The foregoing self-locking lever assembly 9 is movably fixed on the housing 1. A locking hole 10 is provided on one side of the balance piston 3 facing the self-locking lever assembly 9. The balance piston 3 is locked in the movable cavity 2 by the self-locking lever assembly 9 falling into the locking hole 10, and the state of the valve core is locked by the valve core chamber 6 provided thereon to ensure the working state in the safety double valve.

[0025] It should be noted that a positioning convex block 11 is also provided on the balance piston 3. The positioning convex block 11 is fixedly arranged at the midline of the balance piston 3. Locking holes 10 are fixedly arranged on both sides of the positioning convex block 11. The width of the positioning convex block 11 is not less than the width of the self-locking lever assembly 9, so that in the normal state, the self-locking lever assembly 9 can be located on the positioning convex block 11. Only when the safety double valve is in a single fault state, the self-locking lever assembly 9 can fall into the locking hole 10 to complete the locking of the position of the balance piston 3.

[0026] The aforementioned self-locking lever assembly 9 includes a lever body 12, a handle 13 fixed on the lever body 12, and a spring 14 sleeved on the lever body 12. The spring 14 is arranged in a cavity opened on the housing 1. One end of the spring 14 contacts the inner wall of the cavity, and the other end is fixed by a push rod 15. By means of the provided handle 13, the lever body 12 can be pulled outwards, so as to cooperate with the air pressure on both sides of the balance piston 3 to make the balance piston 3 return to the middle position of the movable cavity 2 again, and the lever body 12 can re-abut against the positioning lug 11 under the reset action of the spring 14.

[0027] It should be added that first grooves 16 for embedding the elastic components 5 are opened at both ends of the balance piston 3, and second grooves 17 for fixing the other ends of the elastic components 5 are opened on the movable cavity 2 facing both ends of the balance piston 3. A damping hole 4 penetrates the first grooves 16 at both ends of the balance piston 3 to assist in regulating the air pressure balance at both ends of the balance piston 3. A sealing ring 18 is sleeved on the balance piston 3 to ensure that the air pressure balance on both sides of the balance piston 3 can only be regulated through the damping hole 4.

[0028] By arranging a self-locking valve under the safety double valve, it is ensured that when any one of the channels in the safety double valve and its control system fails (referred to as a single failure), as long as the failure is not eliminated or not confirmed after elimination, no matter how many "power-on, power-off" signals are superimposed, the pressure at the output port of the safety double is below the clutch driving pressure (≤0.04 MPa), and once again meets the conditions for the main safety function of the safety double valve to be realized by mechanical means in the fault accumulation state. It achieves the redundant control purpose that the safety double valve realizes the safety function in the fault accumulation state by means of a pneumatic logic control circuit and the main safety function in the fault accumulation state by mechanical means.

[0029] The technical scope of the present invention is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A self-locking valve applied to a safety double valve, characterized in that, The self-locking valve is fixedly arranged at the lower end of the safety double valve and includes a housing (1). An active cavity (2) is formed in the housing (1). A balance piston (3) is movably arranged in the active cavity (2). Air passages communicating with the air inlet chamber of the safety double valve are formed on the left and right sides of the active cavity (2). A damping hole (4) is formed through the length direction of the balance piston (3). Elastic components (5) are fixedly arranged between the left and right sides of the balance piston (3) and the inner wall of the active cavity (2).

2. The self-locking valve applied to the safety double-valve according to claim 1, wherein, A valve core accommodation chamber (6) is formed on the side of the balance piston (3) facing the air inlet chamber. The valve core accommodation chamber (6) includes a first accommodation chamber section (7) and a second accommodation chamber section (8). The depth of the first accommodation chamber section (7) is less than that of the second accommodation chamber section (8) to adapt to the movement range of the valve core. The first accommodation chamber section (7) is close to the end of the balance piston (3).

3. The self-locking valve applied to the safety double check valve according to claim 2, characterized in that The width of the second accommodation chamber section (8) is not less than the sum of the width of the valve core and the distance between one side of the balance piston (3) at the center of the active cavity (2) and the active cavity (2).

4. The self-locking valve applied to the safety double valve according to claim 2, characterized in that, The width of the first accommodation chamber section (7) is not less than the width of the valve core.

5. The self-locking valve applied to the safety double check valve according to claim 1, characterized in that, It further includes a self-locking rod assembly (9). The self-locking rod assembly (9) is movably fixed on the housing (1). A locking hole (10) is formed on the side of the balance piston (3) facing the self-locking rod assembly (9).

6. The self-locking valve applied to the safety double valve according to claim 5, characterized in that, It further includes a positioning convex block (11). The positioning convex block (11) is fixedly arranged at the midline of the balance piston (3). Locking holes (10) are fixedly arranged on both sides of the positioning convex block (11). The width of the positioning convex block (11) is not less than the width of the self-locking rod assembly (9).

7. The self-locking valve applied to the safety double valve according to claim 5, characterized in that The self-locking rod assembly (9) includes a rod body (12), a handle (13) fixed on the rod body (12), and a spring (14) sleeved on the rod body (12). The spring (14) is arranged in a cavity formed in the housing (1). One end of the spring (14) contacts the inner wall of the cavity, and the other end is fixed by a push rod (15).

8. The self-locking valve applied to the safety double valve according to claim 1, characterized in that, First embedding grooves (16) for embedding the elastic components (5) are formed at both ends of the balance piston (3). Second embedding grooves (17) for fixing the other ends of the elastic components (5) are formed at both ends of the active cavity (2) facing the balance piston (3).

9. The self-locking valve applied to the safety double-valve according to claim 8, characterized in that, The damping hole (4) penetrates through the first embedding grooves (16) on both sides.

10. The self-locking valve applied to the safety double check valve according to claim 1, characterized in that, A sealing ring (18) is sleeved on the balance piston (3).

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