A switch detection device for an emergency cut-off valve applied to a fuel truck

Abstract

The application discloses a switch detection device of an emergency cut-off valve applied to a refueling vehicle, and relates to the technical field of emergency cut-off valve detection.The switch detection device comprises a valve body, the valve body is provided with flange plate one and flange plate two, the flange plate one and the flange plate two are fixedly connected with an access pipe, the flange plate two is installed with a valve clack, the access pipe is provided with a rotating shaft support, the rotating shaft support is rotationally connected with a cut-off valve handle, the cut-off valve handle is fixedly connected with a connecting rod, the connecting rod is rotationally connected with a jacking rod, the rotating shaft support is installed with a proximity switch, the proximity switch is electrically connected with a buzzer, and the buzzer is electrically connected with an electronic control unit.The cut-off valve handle is installed at the access pipe of the valve body, the cut-off valve handle is rotated to drive the jacking rod to realize manual control on the opening and closing state of the valve body, the control of the gear switch in the vehicle is used to realize the receiving of the early warning signal, and the accurate monitoring and early warning on the opening and closing state of the valve are realized when the vehicle is started and stopped.

Description

Technical Field

[0001] This invention relates to the field of emergency shut-off valve testing technology, and more specifically to a device for testing the on / off state of an emergency shut-off valve used in refueling trucks. Background Technology

[0002] "Fuel truck" is a general term for vehicles that transport oil and refueling. These vehicles require high safety performance due to the need to transport large quantities of flammable and explosive products. Specifically, emergency shut-off valves are mandatory to ensure the stability and safety of oil flow. Furthermore, GB 7258-2017, section 12.12.4, imposes specific requirements on emergency shut-off valves. Specifically, tank trucks transporting liquid dangerous goods equipped with emergency shut-off devices must be designed and manufactured to ensure that the emergency shut-off valve automatically closes when the vehicle's speed exceeds 5 km / h, or that a clear signal device (e.g., audible or visual signal) prompts the driver to close the emergency shut-off valve when the engine is started. Therefore, a corresponding valve open / close detection device must be installed at the emergency shut-off valve.

[0003] The existing emergency shut-off valve has a cylinder installed on the valve body, and an air pipe is branched off from the air inlet of the cylinder and connected to the air pressure switch. The air pressure switch is also installed on the same side of the emergency shut-off valve. Since there is a difference in air pressure at the air pressure switch when the cylinder opens and closes the valve body, it can be determined whether the valve body is closed by the cylinder by detecting the air pressure at the air pressure switch.

[0004] The shortcomings of this technical solution are as follows: Since this type of emergency shut-off valve controls the opening and closing of the valve body through a control cylinder, it is limited by the vehicle's cylinder power system. When the electric drive system of the vehicle's cylinder part fails, it is impossible to effectively control the emergency valve of the refueling truck. Therefore, in order to ensure the stability of the opening and closing of the emergency shut-off valve and reduce the dependence of the valve opening and closing on the electric drive system, some refueling trucks use manual emergency shut-off valves. However, the existing on / off detection device for the electric control opening and closing state of the emergency shut-off valve cannot be applied to the on / off detection of the manual emergency shut-off valve. Summary of the Invention

[0005] The purpose of this invention is to provide a switch detection device for an emergency shut-off valve used in a refueling truck. The technical problem to be solved is as follows: Existing emergency shut-off valve switch detection devices cannot detect the switch status of manually operated emergency shut-off valves.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A switch detection device for an emergency shut-off valve used in a refueling truck includes a valve body with a first flange and a second flange. An inlet pipe is fixedly connected between the first flange and the second flange. A valve disc is mounted on one side of the second flange, and a rotating shaft bracket is mounted on one side of the inlet pipe. A shut-off valve handle is rotatably connected to the rotating shaft bracket. A connecting rod is fixedly connected to the shut-off valve handle, and a push rod is rotatably connected to the connecting rod. The push rod is used to adjust the closed state of the valve disc. A proximity switch is mounted on the rotating shaft bracket. A detection boss is provided on the side of the shut-off valve handle near the proximity switch. A buzzer is electrically connected to the proximity switch, and an electronic control unit is electrically connected to the buzzer. The detection boss senses the distance to the proximity switch and transmits a warning signal to the electronic control unit.

[0008] As a further embodiment of the present invention: one end face of the flange is a vertical face, the other end face of the flange is an inclined face, and the first flange, the second flange and the access pipe are integrally connected.

[0009] As a further embodiment of the present invention: the rotating shaft bracket extends from the outside of the access tube to the inside of the access tube, and a base is fixedly connected to the inner wall of the access tube at a location where the central axis of the rotating shaft bracket is collinear with that of the rotating shaft bracket. The shut-off valve handle is rotatably connected between the rotating shaft bracket and the base.

[0010] As a further embodiment of the present invention: a valve cylinder is fixedly connected to the outer side of the second flange, a baffle is installed on the top of the valve cylinder, the top and peripheral sides of the valve cylinder are hollow, a spring is fixedly connected to the inner side of the baffle, the side of the spring away from the baffle is fixedly connected to the valve disc, a guide cylinder is fixedly connected to the bottom surface of the valve disc, a valve seat is provided on the inner side of the second flange, and a sealing ring is installed on the valve disc on the adjacent surface of the valve seat.

[0011] As a further aspect of the present invention: the valve seat is gradually tapering towards the top rod, and the valve disc is adapted to the adjacent surface of the valve seat.

[0012] As a further aspect of the present invention: a guide block is provided at the bottom of the top rod, the bottom surface of the guide block is slidably connected to the inner wall of the access tube, and the guide tube is conical.

[0013] As a further aspect of the present invention: the electronic control unit is electrically connected to a transmission, the transmission is provided with a gear position switch, and the gear position switch is used to control the path status with the proximity switch and the buzzer.

[0014] As a further aspect of the present invention: a bracket is fixedly connected to the outside of the access tube of the rotating shaft bracket, the proximity switch is installed on one side of the bracket, and a position sensor is provided on the side of the proximity switch near the detection boss.

[0015] The beneficial effects of this invention are:

[0016] 1. In this invention, a shut-off valve handle is installed on the outside of the valve body's inlet pipe, a connecting rod is fixedly connected to the part of the shut-off valve handle located inside the inlet pipe, a top rod is rotatably connected to the end of the connecting rod, a valve disc with a spring is installed at the valve body flange two, a sealing ring is installed on the inside of the valve disc, the valve disc and the valve seat on the inside of the flange two are both inclined surfaces, a guide cylinder for limiting is installed on the side of the valve disc near the top rod, and by manually rotating the shut-off valve handle on the outside of the valve body, the connecting rod and the top rod inside the inlet pipe are driven to push or release the valve disc's seal on the valve seat, thereby realizing manual opening and closing control of the emergency shut-off valve;

[0017] 2. In this invention, a proximity switch with a position sensor is installed on the rotating bracket outside the access pipe, and a detection boss is set on the shut-off valve handle near the proximity switch. When the shut-off valve handle is rotated to a position close to the proximity switch, the push rod pushes the valve disc open, and the valve is in the open state. At this time, the distance between the detection boss and the proximity switch is small, and a valve opening signal can be sent to the vehicle's electronic control unit. When the shut-off valve handle is rotated to a position away from the proximity switch, the push rod retracts and no longer presses against the valve disc. The spring at the top of the valve disc opens and closes the valve. At this time, the distance between the detection boss and the proximity switch is large, and the valve opening signal is disconnected, that is, the valve is in the closed state. By installing an inductive proximity switch on the outside of the valve body to send a valve status signal to the vehicle's electronic control unit, the status monitoring of manually opened and closed valves is realized.

[0018] 3. In this invention, a buzzer is installed in the circuit that sends signals to the proximity switch, and the on / off state between the buzzer, the proximity switch, and the vehicle electronic control unit is controlled by the gear shift switch of the transmission. When the gear shift switch is in the vehicle stopped state, the buzzer and the connection switch circuit are in an open circuit state, and the buzzer does not trigger an alarm regardless of whether the valve is open or closed. When the gear shift switch is in the vehicle started state, the buzzer and the connection switch are connected to the vehicle warning circuit. At this time, when the valve is open, a signal is sent and the buzzer provides an alarm; when the valve is closed, the signal is disconnected and the buzzer is turned off. This achieves accurate monitoring and early warning of the valve opening and closing state when the manual emergency shut-off valve is started and stopped. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3This is a half-sectional view of the shut-off valve in the closed state of the present invention;

[0023] Figure 4 This is a schematic diagram of the shut-off valve in the open state of the present invention;

[0024] Figure 5 This is a half-sectional view of the shut-off valve in the open state of the present invention;

[0025] Figure 6 This is the present invention. Figure 3 Enlarged detail view of point A in the middle;

[0026] Figure 7 This is the present invention. Figure 4 Enlarged detail view of point B in the middle;

[0027] Figure 8 This is a schematic diagram of the overall circuit of the present invention.

[0028] In the diagram: 1. Valve body; 2. Flange 1; 3. Flange 2; 4. Connecting pipe; 5. Rotary shaft bracket; 6. Support; 7. Proximity switch; 8. Buzzer; 9. Shut-off valve handle; 10. Base; 11. Connecting rod; 12. Push rod; 13. Valve cylinder; 14. Baffle; 15. Spring; 16. Valve disc; 17. Valve seat; 18. Guide cylinder; 19. Detection boss; 20. Sealing ring; 21. Guide block; 22. Gearbox; 23. Gear position switch; 24. Electronic control unit. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 8 As shown, an on / off detection device for an emergency shut-off valve used in a fuel truck includes a valve body 1. A flange 2 is provided on one side of the valve body 1. The flange 2 is in a vertical position during use and is used to connect to an external oil pipeline. A flange 3 is provided on the other side of the valve body 1. The flange 3 is connected to the tank of the fuel truck. Since the interface of the oil tank is usually located below the cylindrical tank, the flange 3 is set at an angle to the top to facilitate connection with the oil tank.

[0031] like Figures 1 to 5As shown, an inlet pipe 4 is installed between flange 1 (2) and flange 2 (3) of valve body 1. A rotating shaft bracket 5 is fixedly connected to the outer side of the inlet pipe 4. A bracket 6 is fixed to the outer side of the rotating shaft bracket 5 by screws. A proximity switch 7 is installed at the end of the bracket 6 away from valve body 1. The proximity switch 7 is an inductive switch with a position sensor at its end. The proximity switch 7 is connected to a buzzer 8 in the driver's cab to trigger the buzzer 8 to alert the driver. A shut-off valve handle 9 is rotatably connected inside the rotating shaft bracket 5. The shut-off valve handle 9 is Z-shaped; one side is used by the operator to hold the valve body 1 during operation, and the other side extends through the rotating shaft bracket 5 into the inlet pipe 4, where it is rotatably connected to a base 10 inside the inlet pipe 4. A connecting rod 11 is fixedly connected to the outside of the handle 9 located in the middle of the inside of the inlet pipe 4. The end of the connecting rod 11 away from the handle 9 of the shut-off valve is rotatably connected to the top rod 12. A valve cylinder 13 is fixedly connected to the middle of one side of the flange 2 3. The top and circumferential sides of the valve cylinder 13 are hollowed out to facilitate the smooth flow of the medium when the valve body 1 is opened. A baffle 14 is installed on the top of the valve cylinder 13. A spring 15 is fixedly connected to the inside of the baffle 14 near the rotating shaft frame 5. A valve disc 16 is fixedly connected to the spring 15 on the side away from the baffle 14. At the same time, a valve seat 17 is provided on the inside of the flange 2 3. The inner ring of the valve seat 17 is an inclined annular surface. A guide cylinder 18 is fixedly connected to the valve disc 16 on the side away from the baffle 14. The guide cylinder 18 abuts against the inlet top rod 12.

[0032] It should be noted that the part of the shut-off valve handle 9 located on the outside of the valve body 1 is provided with a detection boss 19. The detection boss 19 is a sensing surface with a flat end face. It is fixed on the side close to the proximity switch 7. It determines whether the valve body 1 is closed by detecting the distance between the valve handle 9 and the position sensor of the proximity switch 7. When the distance is close to the predetermined threshold range, it is determined that the valve is open. When the distance is far away from the predetermined threshold range, it is determined that the valve is closed. After the determination, the position sensor feeds back the corresponding electrical signal to the inside of the vehicle body.

[0033] like Figures 1 to 3 , Figure 6As shown in the attached figures, the emergency shut-off valve is in the closed state. When the operator rotates the shut-off valve handle 9, located on the outer side of the valve body 1, away from the proximity switch 7, the handle 9, connected to the inside of the inlet pipe 4, simultaneously moves the connecting rod 11 backward towards the flange 2. A guide block 21 is provided on the bottom surface of the push rod 12. The bottom surface of the guide block 21 is arc-shaped and abuts against the inner wall of the inlet pipe 4. The arc-shaped structure facilitates sliding connection with the inner wall of the inlet pipe 4. Simultaneously, the spring 15, fixedly connected to the valve disc 16, is... The retraction of the push rod 12 applies pressure to the valve disc 16, and the bottom surface of the valve disc 16 abuts against the valve seat 17, thereby achieving the closure of the valve disc 16 inside the valve while the valve handle 9 is rotated externally. The bottom surface of the valve disc 16 and the valve seat 17 are both inclined surfaces. When pressed down towards the side closer to the flange 2, they gradually contract. A sealing ring 20 is installed on the bottom surface of the valve disc 16. The sealing ring 20 is preferably a rubber sealing ring. When pressed down gradually, it is compressed between the valve disc 16 and the valve seat 17, forming a closure of the valve body 1 through deformation sealing.

[0034] like Figure 4 , Figure 5 and Figure 7 As shown in the attached figures, the emergency shut-off valve is in the open position. The operator rotates the shut-off valve handle 9 to the proximity switch 7. At the same time, the part of the shut-off valve handle 9 located inside the inlet pipe 4 drives the connecting rod 11 to push the push rod 12. The push rod 12 pushes the guide cylinder 18 along the guide block 21. Since the guide cylinder 18 has a gradually contracting conical structure during the pushing process, it can accurately push the valve disc 16 under the limiting effect of the guide block 21 and the guide cylinder 18. The spring 15 is then compressed by the force, and the valve seat 17 and the valve disc 16 move away from each other, and the valve body 1 opens. Since flange 2 is connected to the external oil pipeline and flange 3 is connected to the oil tank, and the valve cylinder 13 is hollow, it can ensure the smooth passage of the transport medium. However, it can also lead to the loss of medium when the valve is forgotten to be closed, resulting in the risk of forgetting to close the valve when starting the vehicle.

[0035] The working principle of this invention is as follows: Figure 8 As shown, the proximity switch 7 is connected to the buzzer 8 inside the vehicle via a wire. The buzzer 8 is also connected to the gear position switch 23 of the transmission 22 (MT). The transmission 22 is the vehicle gear position controller. When the gear is shifted to the parking position, i.e. the wire is disconnected (the gear position switch 23 is in the solid line position), the gear position switch 23 is disconnected from the buzzer 8. At this time, regardless of whether there is a connection between the proximity switch 7 and the detection boss 19, the buzzer 8 will not work because it is disconnected. That is, when the vehicle is stopped, the opening and closing state of the valve body 1 will not trigger the warning function of the buzzer 8, which is considered to be a normal working state.

[0036] When the transmission 22 is shifted to driving mode (gear switch 23 is in the dotted line position), that is, when the vehicle is started, the gear switch 23 is connected to the buzzer 8. The buzzer 8 is also connected to the vehicle's electronic control unit 24 (ECU). At the same time, the proximity switch 7 is also connected to the ECU. Therefore, when the vehicle is in motion, if the proximity switch 7 is in the closed state, the distance between the proximity switch 7 and the shut-off valve handle 9 will approach each other. At this time, the shut-off valve handle 9 will drive the connecting rod 11 and the push rod 12 to push the valve disc 16, and the valve body 1 will be in the open state, that is, there is an oil leak. At this time, because the circuit of the proximity switch 7 is closed, the electrical signal emitted by the position sensor on it is received by the vehicle's electronic control unit 24, and the buzzer 8 will sound an alarm to remind the staff to close the valve in time.

[0037] If the proximity switch 7 is in the open state, the proximity switch 7 and the shut-off valve handle 9 are far apart. At this time, the shut-off valve handle 9 drives the connecting rod 11 and the push rod 12 to move backward toward the flange 2. The spring 15 opens the valve disc 16 and closes the valve body 1. That is, when the valve body 1 is closed, the proximity switch 7 is in the open state and will not emit an electrical signal. The electronic control unit 24 does not receive the corresponding electrical signal, so the buzzer 8 will not trigger an alarm. That is, when the vehicle is in motion, the opening and closing state of the proximity switch 7 is related to the working state of the buzzer 8, and the vehicle is in a warning state to detect whether the valve is open.

[0038] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A switch detection device for an emergency shut-off valve applied to a refueling truck, comprising a valve body (1), wherein the valve body (1) is provided with a first flange (2) and a second flange (3), and an inlet pipe (4) is fixedly connected between the first flange (2) and the second flange (3), characterized in that, A valve disc (16) is installed on one side of the flange (3), and a rotating shaft bracket (5) is provided on one side of the inlet pipe (4). The rotating shaft bracket (5) is rotatably connected to a shut-off valve handle (9). The shut-off valve handle (9) is fixedly connected to a connecting rod (11). The connecting rod (11) is rotatably connected to a top rod (12). The top rod (12) is used to adjust the closed state of the valve disc (16). A proximity switch (7) is installed on the rotating shaft bracket (5). A detection boss (19) is provided on the side of the shut-off valve handle (9) near the proximity switch (7). The proximity switch (7) is electrically connected to a buzzer (8). The buzzer (8) is electrically connected to an electronic control unit (24). The detection boss (19) is used to sense the distance between itself and the proximity switch (7) and to send a warning signal to the electronic control unit (24). The rotating shaft bracket (5) extends from the outside of the access pipe (4) to the inside of the access pipe (4). A base (10) is fixedly connected to the inner wall of the access pipe (4) which is collinear with the central axis of the rotating shaft bracket (5). The shut-off valve handle (9) is rotatably connected between the rotating shaft bracket (5) and the base (10). The electronic control unit (24) is electrically connected to the transmission (22), and the transmission (22) is equipped with a gear position switch (23). The gear position switch (23) is used to control the circuit status with the proximity switch (7) and the buzzer (8). When the gear position switch (23) is in the parking gear, the circuit of the proximity switch (7) and the buzzer (8) is physically disconnected. When the gear position switch (23) is in the driving gear, the circuit of the proximity switch (7) and the buzzer (8) is connected. A bracket (6) is fixedly connected to the outside of the access tube (4) of the rotating shaft bracket (5). The proximity switch (7) is installed on one side of the bracket (6). A position sensor is provided on the side of the proximity switch (7) near the detection boss (19). A valve cylinder (13) is fixedly connected to the outside of the second flange (3). A baffle (14) is installed on the top of the valve cylinder (13). The top and sides of the valve cylinder (13) are hollow. A spring (15) is fixedly connected to the inside of the baffle (14). The side of the spring (15) away from the baffle (14) is fixedly connected to the valve disc (16). A guide cylinder (18) is fixedly connected to the bottom surface of the valve disc (16). A valve seat (17) is provided inside the second flange (3). A sealing ring (20) is installed on the adjacent surface of the valve disc (16) to the valve seat (17).

2. The on / off detection device for an emergency shut-off valve applied to a refueling truck according to claim 1, characterized in that, The end face of flange one (2) is a vertical face, the end face of flange two (3) is an inclined face, and flange one (2), flange two (3) and the inlet pipe (4) are integrally connected.

3. The on / off detection device for an emergency shut-off valve applied to a refueling truck according to claim 1, characterized in that, The valve seat (17) is gradually tapering towards the top rod (12), and the valve disc (16) is adapted to the adjacent surface of the valve seat (17).

4. The on / off detection device for an emergency shut-off valve applied to a refueling truck according to claim 1, characterized in that, The bottom of the top rod (12) is provided with a guide block (21), the bottom surface of the guide block (21) is slidably connected to the inner wall of the access pipe (4), and the guide cylinder (18) is conical.

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