A vacuum and positive pressure dual-purpose electric single-disc valve and its control method

Abstract

The present invention discloses a vacuum and positive pressure dual-purpose electric single-disc valve, comprising a valve support, a main valve body mounted on the valve support, a secondary valve body mounted on the main valve body, an electric actuator mounted on the secondary valve body, a valve plate connected to the electric actuator, and a PLC control system. The valve is characterized in that the main valve body is also mounted with a plurality of material sensors; the secondary valve body is also mounted with a maintenance safety device; the safety device comprises a lifting ring screw and a safety latch structure; and both the secondary valve body and the main valve body are mounted with a switch sensing structure. The present invention utilizes a safety device, which can only perform valve maintenance when the safety device simultaneously senses signals from the lifting ring and the limit rod during maintenance, thereby improving worker safety. The material sensor senses the condition of the material or trolley in the valve cavity in real time and feeds back to the PLC control system. The PLC control system controls the movement of the electric actuator to prevent damage to the material trolley and the valve body itself.

Description

Technical Field

[0001] The present invention relates to the technical field of plug-in valves, in particular to a vacuum-positive-pressure dual-purpose electric single-disc valve and a control method thereof. Background Art

[0002] The gate valve, also known as the manual knife-type gate valve, is a valve in which the gate and valve seat are always in close contact and sealed. In the existing technology, during the closing process of the gate valve, the outside cannot sense whether there is a material cart in the inner cavity of the gate valve. Sometimes the material cart has not completely passed through the gate valve, or the material cart has exceeded the stop line, and part of the material car body is in the inner cavity of the gate valve. The gate valve cannot sense it, causing the gate valve to close and the valve disc to move downward, causing damage to the material cart, resulting in certain economic losses and affecting production progress. Furthermore, there is no way to provide feedback to on-site staff on whether the gate valve is open or closed, making it impossible to monitor the movement time of materials in the tunnel line. This can lead to accidents where the material cart begins to move forward while the gate valve is still opening, causing the material cart to collide with the gate valve disc. Furthermore, repeated opening and closing of the valve disc over a long period of time will cause wear on the valve disc and valve body, reducing the sealing effect of the valve body. Consequently, the gate valve requires maintenance or repair when the valve disc is damaged. During maintenance, the gate valve disc is either open or closed. When the valve disc needs to be opened, there is no guarantee that the disc will not fail and slide off on its own, resulting in a lack of safety for maintenance personnel or other unnecessary injuries. Therefore, a vacuum-positive-pressure dual-purpose electric single gate valve and a control method thereof are proposed. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems and to provide a vacuum and positive pressure dual-purpose electric single-disc valve and a control method thereof.

[0004] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a vacuum and positive pressure dual-purpose electric single-disc valve, comprising a valve bracket, a main valve body mounted on the valve bracket, an auxiliary valve body mounted on the main valve body, an electric actuator mounted on the auxiliary valve body, and a valve plate and a PLC control system connected to the electric actuator; the valve plate is characterized in that a plurality of material sensors are also mounted on the main valve body; a maintenance safety device is also mounted on the auxiliary valve body; the safety device comprises a lifting eye screw and a safety latch structure; and a switch sensing structure is mounted on both the auxiliary valve body and the main valve body.

[0005] Preferably, the switch sensing structure includes a valve plate opening positioning sensor, a valve plate closing positioning sensor, which are respectively installed on the auxiliary valve body and the main valve body, and a plurality of sensing sheet metals installed on the valve plate.

[0006] Preferably, the safety latch structure includes a plurality of first bases and second bases installed on the auxiliary valve body, and a limiting rod installed on the first base.

[0007] Preferably, the first base and the second base are arranged opposite to each other; and a handle is installed on the limiting rod.

[0008] Preferably, the electric actuator is connected to a screw rod; a bracket is movably mounted on the screw rod; the valve plate is connected to the screw rod via the bracket; and a guide assembly is installed between the valve plate and the main valve body and the auxiliary valve body.

[0009] Preferably, a hinge is installed between the valve plate and the bracket.

[0010] Preferably, the guide assembly includes guide rails installed in the main valve body and the auxiliary valve body, and sliders installed on the valve plate and adapted to the guide rails.

[0011] Preferably, a plurality of external support wheels and internal support wheels are also installed on the main valve body.

[0012] A control method for a vacuum and positive pressure dual-purpose electric single-disc valve, the control method steps are as follows:

[0013] Step 1: The PLC control system sends a command to the electric actuator to open the gate valve. After receiving the command, the electric actuator opens the gate valve.

[0014] Step 2: During the valve plate opening process, the valve plate opening positioning sensor senses the sensing sheet metal on the valve plate and sends a signal to the PLC control system. The PLC control system receives the signal and controls the electric actuator to stop working. If the PLC control system does not receive the signal, it controls the electric actuator to continue working.

[0015] Step 3: When the valve is closed, the material sensor senses whether there is material in the valve cavity. If no material is sensed, the signal is fed back to the PLC control system, and the PLC control system controls the electric actuator to work. If material is sensed, the signal is fed back to the PLC control system, and the PLC control system controls the electric actuator to suspend work.

[0016] Step 4: The PLC control system sends a command to the electric actuator to close the gate valve, and the electric actuator closes the gate valve after receiving the command;

[0017] Step 5: During the valve plate closing process, the valve plate closes the sensing sheet metal on the positioning sensor valve plate and sends a signal to the PLC control system. The PLC control system controls the electric actuator to stop working. If the PLC control system does not receive the signal, it controls the electric actuator to continue working.

[0018] As a preferred embodiment, the invention further includes a control method for valve maintenance, wherein the steps of the control method for valve maintenance are as follows:

[0019] Step 1: The second base and the in-position sensor send the sensed signal to the PLC control system;

[0020] Step 2: If the PLC control system receives the signal from the second base and the signal from the in-position sensor of the eye screw at the same time, maintenance can be carried out. If the PLC control system receives only one of the signals or no signal, an alarm will be issued and maintenance cannot be carried out.

[0021] The beneficial effects of the present invention are as follows: by utilizing the safety device, during maintenance, the valve can be maintained only when the safety device simultaneously senses the signals of the lifting ring and the limit rod, thereby improving the safety of workers;

[0022] The material sensor senses the situation of the material or trolley in the valve cavity in real time and feeds it back to the PLC control system. The PLC control system controls the movement of the electric actuator to prevent damage to the material trolley and the valve body itself.

[0023] The switch sensing structure senses the sensing sheet metal on the valve plate to ensure that the valve plate is fully opened or closed to prevent safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is a side view of the present invention.

[0026] Figure 3 It is a schematic diagram of the local structure of the present invention.

[0027] Figure 4 It is a control principle diagram of the valve maintenance of the present invention.

[0028] Legend: 1 valve bracket; 2 main valve body; 201 external support wheel; 202 internal support wheel; 3 auxiliary valve body; 4 electric actuator; 5 valve plate; 501 screw rod; 502 bracket; 503 guide assembly; 504 hinge; 505 guide rail; 506 slider; 6 safety device; 601 lifting eye screw; 602 safety latch structure; 603 first base; 604 second base; 605 limit rod; 606 handle; 607 in-position sensor; 7 switch sensing structure; 701 valve plate open positioning sensor; 702 valve plate closed positioning sensor; 703 induction sheet metal; 8 material sensor. DETAILED DESCRIPTION

[0029] The following further describes the vacuum and positive pressure dual-purpose electric single-disc valve and its control method according to the present invention with reference to the accompanying drawings.

[0030] See attached Figure 1-3As shown, in this embodiment, a vacuum-positive-pressure dual-purpose electric single-disc valve comprises a valve support 1, a main valve body 2 mounted on the valve support 1, a secondary valve body 3 mounted on the main valve body 2, an electric actuator 4 mounted on the secondary valve body 3, and a valve plate 5 connected to the electric actuator 4. It is characterized in that the main valve body 2 is further mounted with a plurality of material sensors 8; the secondary valve body 3 is further mounted with a maintenance safety device 6; the safety device 6 comprises a lifting eye screw 601 and a safety latch structure 602; and both the secondary valve body 3 and the main valve body 2 are mounted with a switch sensing structure 7. By utilizing the safety device 6, the valve can only be maintained when the safety device simultaneously senses the signals of the lifting screw 601 and the limit rod 605 during maintenance, thereby improving the safety of workers; the material sensor 8 senses the situation of the material or trolley in the valve cavity in real time and feeds back to the circuit PLC, and the material sensor controls the movement of the electric actuator 4 to prevent damage to the material trolley and the valve body 1 itself; the switch sensing structure 7 senses the sensing sheet metal 703 on the valve plate 5, thereby ensuring that the valve plate is opened or closed in place to prevent safety accidents.

[0031] See attached Figure 1-3 As shown, the switch sensing structure 7 includes a valve plate opening positioning sensor 701, a valve plate closing positioning sensor 702, and several sensing sheet metals 703 installed on the valve plate 5. The valve plate opening positioning sensor 701 senses the sensing sheet metal 703 on the valve plate 5, indicating that the valve plate 5 is in the open position. The valve plate closing positioning sensor 702 senses the sensing sheet metal 703 on the valve plate 5, indicating that the valve plate 5 is in the closed position, thereby ensuring that the valve plate 5 is in the open or closed position to prevent safety accidents.

[0032] See attached Figure 1-3 As shown, the safety latch structure 602 includes a plurality of first bases 603 and second bases 604 installed on the auxiliary valve body 3 and a limiting rod 605 installed on the first base 603; the first base 603 and the second base 604 are arranged opposite to each other; a handle 606 is installed on the limiting rod 605; by using the handle 606 to push the limiting rod 605 through the eye screw 601 and insert it into the second base 604, the second base 604 senses the limiting rod 605, and at the same time the in-position sensor of the eye screw 601 senses it, so that the valve body 1 can be maintained, thereby improving the safety of workers during maintenance.

[0033] See attached Figure 1-3As shown, the electric actuator 4 is connected to a screw rod 501; a bracket 502 is movably mounted on the screw rod 501; the valve plate 5 is connected to the screw rod 501 through the bracket 502; a guide assembly 503 is installed between the valve plate 5 and the main valve body 2 and the auxiliary valve body 3; a hinge 504 is installed between the valve plate 5 and the bracket 502; the guide assembly 503 includes a guide rail 505 installed in the main valve body 2 and the auxiliary valve body 3 and a slider 506 installed on the valve plate 5 and adapted to the guide rail 505; a number of external support wheels 201 and internal support wheels 202 are also installed on the main valve body 2.

[0034] See attached Figure 1-4 As described above, in the working process of the present invention, when the valve is opened, the PLC control system sends a control signal to the electric actuator 4, the electric actuator 4 works and drives the screw rod 501 to rotate, the screw rod 501 drives the hanger 502 to move upward, and under the action of the hinge, the upper part of the valve plate 5 leaves the sealing surface of the plug-in valve cavity and moves closer to the hanger 502, and the hanger 502 drives the valve plate 5 to move upward along the guide rail 505 until the valve plate is opened. The positioning sensor 701 senses the sensing sheet metal 703 on the valve plate 5 and feeds back the signal to the PLC control system. The PLC control system controls the electric actuator 4 to stop working. For example, when the valve needs to be closed, the material sensor 8 senses whether there is material or a material trolley in the valve cavity. If no material or material trolley is sensed, the signal is fed back to the PLC control system. The PLC control system controls the electric actuator 4 to work. If material or a material trolley is sensed, the signal is fed back to the PLC control system, and waits for the signal that there is no material or a material trolley in the valve cavity, and then controls the electric actuator 4 to work. Then the PLC control system sends the control signal to the electric actuator 4. The actuator 4 is driven, and the electric actuator 4 works and drives the screw rod 501 to rotate in the opposite direction. The screw rod 501 drives the hanger 502 to move downward, and the hanger 502 drives the valve plate 5 to move downward along the guide rail 505 until the valve plate closing position sensor 702 senses the sensing sheet metal 703 on the valve plate 5. The valve plate closing position sensor 702 sends a signal to the PLC control system, and the PLC control system controls the electric actuator 4 to stop working. When the valve needs maintenance, the handle 606 is used to push the limit rod 605 through the eye screw 601 and insert it into the second base 604. The second base 604 senses the limit rod 605 and feeds back a signal to the PLC control system. At the same time, the position sensor 607 also feeds back the signal of the eye screw 601 to the PLC control system. The PLC control system will not alarm when it receives both signals, so that maintenance of the valve body 1 can be carried out. When the PLC control system only receives one of the signals or neither signal is received, the PLC control system controls the alarm to alarm. In this case, maintenance of the valve body 1 cannot be carried out.

[0035] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A vacuum positive pressure dual-purpose electric single-disc valve, comprising a valve support (1), a main valve body (2) mounted on the valve support (1), an auxiliary valve body (3) mounted on the main valve body (2), an electric actuator (4) mounted on the auxiliary valve body (3), a valve plate (5) connected to the electric actuator (4), and a PLC control system; its characteristics are: The main valve body (2) is also equipped with a plurality of material sensors (8); the auxiliary valve body (3) is also equipped with a maintenance safety device (6); the safety device (6) includes a lifting eye screw (601) and a safety latch structure (602); the auxiliary valve body (3) and the main valve body (2) are both equipped with a switch sensing structure (7); the safety latch structure (602) includes a plurality of first bases (603) and second bases (604) installed on the auxiliary valve body (3) and a limit rod (605) installed on the first base (603); the auxiliary valve body (3) is also equipped with an in-position sensor (607); the lifting eye screw (601) is installed on the in-position sensor (607); the first base (603) and the second base (604) are arranged opposite to each other; and the limit rod (605) is equipped with a handle (606).

2. The vacuum and positive pressure dual-purpose electric single-disc valve according to claim 1, characterized in that: The switch sensing structure (7) comprises a valve plate opening positioning sensor (701) and a valve plate closing positioning sensor (702) respectively mounted on the auxiliary valve body (3) and the main valve body (2), and a plurality of sensing sheet metals (703) mounted on the valve plate (5).

3. The vacuum and positive pressure dual-purpose electric single-disc valve according to claim 1, characterized in that: The electric actuator (4) is connected to a screw rod (501); a hanger (502) is movably mounted on the screw rod (501); the valve plate (5) is connected to the screw rod (501) via the hanger (502); and a guide assembly (503) is mounted between the valve plate (5), the main valve body (2), and the auxiliary valve body (3).

4. The vacuum and positive pressure dual-purpose electric single-disc valve according to claim 3, characterized in that: A hinge (504) is installed between the valve plate (5) and the hanger (502).

5. The vacuum and positive pressure dual-purpose electric single-disc valve according to claim 3, characterized in that: The guide assembly (503) comprises a guide rail (505) installed in the main valve body (2) and the auxiliary valve body (3), and a slider (506) installed on the valve plate (5) and adapted to the guide rail (505).

6. The vacuum and positive pressure dual-purpose electric single-disc valve according to claim 5, characterized in that: A plurality of external support wheels (201) and internal support wheels (202) are also mounted on the main valve body (2).

7. A control method for a vacuum and positive pressure dual-purpose electric single-disc valve according to any one of claims 1 to 6, the control method comprising the following steps: Step 1: The PLC control system sends a command to the electric actuator to open the gate valve. After receiving the command, the electric actuator opens the gate valve. Step 2: During the valve plate opening process, the valve plate opening positioning sensor senses the sensing sheet metal on the valve plate and sends a signal to the PLC control system. The PLC control system receives the signal and controls the electric actuator to stop working. If the PLC control system does not receive the signal, it controls the electric actuator to continue working. Step 3: When the valve is closed, the material sensor senses whether there is material in the valve cavity. If no material is sensed, the signal is fed back to the PLC control system, and the PLC control system controls the electric actuator to work. If material is sensed, the signal is fed back to the PLC control system, and the PLC control system controls the electric actuator to suspend work. Step 4: The PLC control system sends a command to the electric actuator to close the gate valve, and the electric actuator closes the gate valve after receiving the command; Step 5: During the valve plate closing process, the valve plate closes the sensing sheet metal on the positioning sensor valve plate and sends a signal to the PLC control system. The PLC control system controls the electric actuator to stop working. If the PLC control system does not receive the signal, it controls the electric actuator to continue working.

8. The control method of a vacuum and positive pressure dual-purpose electric single-disc valve according to claim 7, characterized in that: It also includes a control method for valve maintenance. The control method steps for valve maintenance are as follows: Step 1: The second base and the in-position sensor send the sensed signal to the PLC control system; Step 2: If the PLC control system receives the signal from the second base and the signal from the in-position sensor at the same time, maintenance can be carried out. If the PLC control system receives only one of the signals or no signal at all, an alarm will be issued and maintenance cannot be carried out.

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