Four-rod linkage cut-off mechanism of emergency cut-off valve

Abstract

The utility model discloses a four-rod linkage cut-off mechanism of an emergency cut-off valve, and relates to the technical field of cut-off valves. Comprising a valve body, the interior of the valve body communicates with a pipe body, a cylinder is arranged on the upper portion in the valve body, an upper valve rod is movably inserted in the cylinder, the upper end of the upper valve rod is in threaded connection with a threaded pressing rod, the upper end of the threaded pressing rod is rotationally connected into the cylinder, and a hexagon bolt is arranged at the upper end of the threaded pressing rod. The hexagon bolt is movably sleeved with a ratchet wrench, a cavity is formed in the lower middle portion in the valve body, a shifting rod is hinged to the inner wall face of the cavity, and a pressing rod is arranged at the lower end of the upper valve rod. According to the emergency cut-off valve, a structure used for manually opening the cut-off valve is designed, the problem of dead running caused by faults of hydraulic transmission is easily solved through the action of the pressing rod, a set of manual opening cut-off function is added to the emergency cut-off valve, and the unique defect of the emergency cut-off valve is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of cut-off valves, in particular to a four-bar linkage cut-off mechanism for an emergency cut-off valve. Background Art

[0002] The QJY43F-2.5 emergency shut-off valve is a gas and liquid interface loading and unloading valve on liquid chlorine tank trucks and storage tanks. It has a nominal pressure of 2.5 MPa, a nominal diameter of 50 mm, and an operating temperature of -40°C to 50°C. It is suitable for media such as anhydrous hydrogen fluoride and liquid chlorine.

[0003] The valve can be quickly closed with the help of hydraulic pressure on site or at a certain distance, or when the ambient temperature (due to fire, etc.) rises to 70℃±5℃, the fusible element on the valve will melt, the valve will close, and the gas and liquid flow will be cut off to prevent the accident from expanding. Therefore, it is a necessary safety protection valve for installing and unloading toxic and explosive media.

[0004] During normal operation, first connect the emergency shut-off valve outlet to the external connecting pipe. Do not open the shut-off valve first. Then tighten the hand oil pump and the pressure relief handle. Then turn the oil pressure handle and slowly increase the pressure. If you feel that using the hand oil pump is strenuous, you can pause for a while. When the pressure before and after the floating valve disc tends to be balanced and it is easier to move the handle, continue to increase the pressure. When it reaches 3.0Mpa, the emergency shut-off valve will be opened.

[0005] During the process of implementing the present invention, the inventor discovered the following problems with the prior art: When the hand-operated oil pump fails to open the shut-off valve even after pressurization exceeding 3.5 MPa, this indicates that the transmission component is stuck, preventing the shut-off valve flap from opening and the emergency shut-off valve from losing its loading and unloading function. When this transmission component is stuck, the tank needs to be cleaned, the medium inside the tank replaced, the accident valve removed, and a new valve replaced before the loading and unloading function can be restored. This type of accident is called a dead vehicle phenomenon in the industry. According to relevant regulations for the management of the hazardous chemicals industry, dead vehicle phenomena must be reported to the State Environmental Protection Supervision Bureau and the Production Safety Bureau and must be subject to supervision. Utility Model Content

[0006] In response to the deficiencies of the prior art, the utility model provides a four-bar linkage shut-off mechanism for an emergency shut-off valve, which solves the problem of the existing hand-operated oil pump. When the shut-off valve is still not opened when the pressure exceeds 3.5Mpa, it indicates that there is a jam in the transmission component, which causes the shut-off valve flap to be unable to open and the emergency shut-off valve to lose its loading and unloading function. When this kind of transmission component jam occurs, the tank body needs to be cleaned, the medium in the tank body replaced, the accident valve removed, and a new valve replaced before the loading and unloading function can be restored. This kind of accident is called a dead car phenomenon in the industry. According to the relevant regulations for the management of the hazardous chemicals industry, the dead car phenomenon must be reported to the State Environmental Protection Supervision Bureau and the Production Safety Bureau and must be subject to supervision.

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: an emergency shut-off valve four-bar linkage shut-off mechanism, including a valve body, the interior of the valve body is connected to a tube body, the upper part of the valve body is provided with a cylinder, an upper valve stem is movably inserted in the cylinder, the upper end of the upper valve stem is threadedly connected to a threaded pressure rod, the upper end of the threaded pressure rod is rotatably connected to the cylinder, the upper end of the threaded pressure rod is provided with a hexagonal bolt, the hexagonal bolt is movably sleeved with a ratchet wrench, a cavity is provided in the middle and lower part of the valve body, a shift rod is hingedly connected to the inner wall of the cavity, the lower end of the upper valve stem is provided with a pressure rod, the lower end of the pressure rod contacts the upper wall of the shift rod, a base is provided at the bottom inner bottom of the valve body, a telescopic rod is provided at the upper end of the base, a floating valve disc is connected to the shut-off valve stem, a spring is connected between the floating valve disc and the base, and the spring is movably sleeved on the telescopic rod.

[0008] Preferably, a pair of slide grooves are provided on the inner wall surface of the cylinder, and a pair of sliders are provided on the side wall surface of the upper valve stem, and the pair of sliders are slidably installed in the pair of slide grooves respectively.

[0009] Preferably, an expansion pipe is provided at the inner bottom of the valve body and between the base and the floating valve disc.

[0010] Preferably, the base is located in the valve body and does not affect the connectivity within the valve body.

[0011] Beneficial effects

[0012] This utility model provides a four-bar linkage shutoff mechanism for an emergency shutoff valve. This design allows for manual opening of the shutoff valve. Manually rotating a ratchet wrench drives the pressure rod downward, which in turn moves the lever downward. This downward movement of the shutoff valve stem causes the telescopic rod to extend and retract, compressing the spring. The floating valve disc moves down four millimeters into the expanded tube, opening the emergency shutoff valve. This pressure rod action easily resolves the problem of vehicle stalling caused by hydraulic transmission failures. By adding a manual opening and shutoff function to the emergency shutoff valve, the only drawback of the emergency shutoff valve is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2 It is a partially enlarged schematic diagram of the present invention.

[0015] In the figure: 1. Ratchet wrench; 2. Valve body; 3. Threaded pressure rod; 4. Upper valve stem; 5. Pipe body; 6. Pressure rod; 7. Push rod; 8. Cut-off valve stem; 9. Floating valve disc; 10. Expander tube; 11. Telescopic rod; 12. Spring; 13. Slide groove; 14. Slider. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] See also Figure 1-2 The utility model provides a technical solution: an emergency shut-off valve four-bar linkage shut-off mechanism, comprising a valve body 2, the interior of the valve body 2 being connected to a pipe body 5, a cylinder being provided on the upper portion of the valve body 2, an upper valve stem 4 being movably inserted in the cylinder, the upper end of the upper valve stem 4 being threadedly connected to a threaded pressure rod 3, the upper end of the threaded pressure rod 3 being rotatably connected in the cylinder, a hexagonal bolt being provided on the upper end of the threaded pressure rod 3, a ratchet wrench 1 being movably sleeved on the hexagonal bolt, the valve body 2 is provided in the middle and lower part, and a lever 7 is hingedly connected to the inner wall of the cavity. A pressure rod 6 is provided at the lower end of the upper valve stem 4, and the lower end of the pressure rod 6 is in contact with the upper wall of the lever 7. A base is provided at the bottom of the valve body 2, and a telescopic rod 11 is provided at the upper end of the base. A floating valve disc 9 is connected to the upper end of the telescopic rod 11, and the floating valve disc 9 is connected to the shut-off valve stem 8. A spring 12 is connected between the floating valve disc 9 and the base, and the spring 12 is movably sleeved on the telescopic rod 11.

[0018] This embodiment is further configured such that a pair of slide grooves 13 are provided on the inner wall surface of the cylinder, and a pair of sliders 14 are provided on the side wall surface of the upper valve stem 4 , and the pair of sliders 14 are slidably installed in the pair of slide grooves 13 respectively.

[0019] This embodiment is further configured such that a diameter expansion tube 10 is provided at the bottom inner portion of the valve body 2 and between the base and the floating valve disc 9 .

[0020] This embodiment is further configured such that the base is located inside the valve body 2 and does not affect the connectivity inside the valve body 2 .

[0021] The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process. The specific operations are as follows.

[0022] Embodiment: Manually rotating the ratchet wrench 1 drives the hexagonal bolt to rotate, and the rotation of the hexagonal bolt drives the threaded pressure rod 3 to rotate, and the rotation of the threaded pressure rod 3 drives the upper valve stem 4 to move downward. When a pair of sliders 14 are respectively located in a pair of slide grooves 13, they have a limiting effect and can drive the upper valve stem 4 to move downward by a rotational drive mode. The upper valve stem 4 moves vertically downward in the cylinder. The downward movement of the upper valve stem 4 drives the pressure rod 6 to move downward and moves the shift rod 7 downward. The downward movement of the shift rod 7 drives the cut-off valve stem 8 to move downward. The downward movement of the cut-off valve stem 8 drives the telescopic rod 11 to extend and retract and the spring 12 is compressed. The floating valve disc 9 moves down four millimeters to the expansion tube 10, and the emergency cut-off valve is opened.

[0023] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. A four-bar linkage shut-off mechanism for an emergency shut-off valve, comprising a valve body (2), characterized in that: The interior of the valve body (2) is connected to a tube (5), a cylinder is provided in the upper part of the valve body (2), an upper valve stem (4) is movably inserted in the cylinder, the upper end of the upper valve stem (4) is threadedly connected to a threaded pressure rod (3), the upper end of the threaded pressure rod (3) is rotatably connected to the cylinder, the upper end of the threaded pressure rod (3) is provided with a hexagonal bolt, a ratchet wrench (1) is movably mounted on the hexagonal bolt, a cavity is provided in the middle and lower part of the valve body (2), and a lever ( 7), a pressure rod (6) is provided at the lower end of the upper valve stem (4), the lower end of the pressure rod (6) is in contact with the upper wall surface of the shift rod (7), a base is provided at the bottom of the inner side of the valve body (2), a telescopic rod (11) is provided at the upper end of the base, a floating valve flap (9) is connected to the upper end of the telescopic rod (11), the floating valve flap (9) is connected to the cut-off valve stem (8), a spring (12) is connected between the floating valve flap (9) and the base, and the spring (12) is movably mounted on the telescopic rod (11).

2. The four-bar linkage shut-off mechanism of the emergency shut-off valve according to claim 1, characterized in that: A pair of slide grooves (13) are provided on the inner wall surface of the cylinder, and a pair of sliders (14) are provided on the side wall surface of the upper valve stem (4). The pair of sliders (14) are slidably installed in the pair of slide grooves (13) respectively.

3. The four-bar linkage shut-off mechanism of the emergency shut-off valve according to claim 1, characterized in that: An expansion pipe (10) is provided at the inner bottom of the valve body (2) and located between the base and the floating valve disc (9).

4. The four-bar linkage shutoff mechanism of the emergency shutoff valve according to claim 1, characterized in that: The base is located in the valve body (2) and does not affect the connectivity in the valve body (2).

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