Blast furnace gas intercepting valve capable of improving positioning accuracy

Abstract

The utility model discloses a blast furnace gas intercepting valve capable of improving positioning accuracy, which comprises a gas storage tank outer cover, a vertically arranged valve rod is arranged at the top of the gas storage tank outer cover, the top end of a valve plate penetrates upwards and is connected with a traction mechanism, a valve cover is arranged at the bottom end of the valve rod, and a vertically arranged supporting rod A is arranged at the top end of the gas storage tank outer cover. A valve closing limiting switch is arranged on the supporting rod A; a maintenance platform is arranged above the gas storage tank outer cover, a through hole is formed in the maintenance platform, the position of the through hole corresponds to that of the valve rod, a supporting rod B is arranged on the maintenance platform, and a valve opening limiting switch is arranged on the supporting rod B; an induction block is arranged at the top end of the valve rod, the induction block is matched with a valve opening limiting switch and a valve closing limiting switch, the valve opening limiting switch and the valve closing limiting switch are both connected to a PLC, and the PLC is in signal connection with the traction mechanism at the same time; according to the utility model, the valve rod can accurately reach a safe stroke position, and effective guarantee is provided for safe production; and the valve opening or closing operation is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace equipment, in particular to a blast furnace gas shut-off valve with improved positioning accuracy. Background Art

[0002] The gas shut-off valve is a gravity dust removal device for the raw gas system of the blast furnace. It is a device used to block the gas source of the gas storage tank. It is normally open when the blast furnace is in normal production, so that the gas can pass through and enter the gas purification system. When the blast furnace is under maintenance, it is closed to separate the gas system from the blast furnace so that the blast furnace or the gas system can be safely inspected. Therefore, the valve is required to be able to be cut off quickly and safely to avoid gas poisoning and explosion accidents. The gas shut-off valve must have the characteristics of reasonable design, reliable operation, rapid switching and good sealing.

[0003] When the blast furnace is in normal production, the electric winch lifts the several-ton shut-off valve cover by pulling the wire rope, and the specific stroke is controlled by the main controller connected to the winch reducer. However, because the wire rope is deformed due to long-term force, although the rotation angle of the main controller remains unchanged, the shut-off valve stroke will eventually change due to the deformation of the wire rope. As a result, every time the blast furnace is shut down for maintenance, one operator has to confirm the valve stroke on site, and one operator has to open and close the valve, which is unsafe. At the same time, the electrician has to readjust the main controller. Utility Model Content

[0004] The utility model aims to solve the problems raised in the above-mentioned background technology and provide a blast furnace gas shut-off valve with improved positioning accuracy.

[0005] The specific technical scheme of the utility model is as follows: a blast furnace gas shut-off valve with improved positioning accuracy comprises a gas tank cover, a vertically arranged valve stem is installed on the top of the gas tank cover, the top of the valve plate passes upward and is connected to the traction mechanism, a valve cover is installed on the bottom of the valve stem, a vertically arranged support rod A is installed on the top of the gas tank cover, and a relevant valve limit switch is installed on the support rod A; an inspection platform is provided above the gas tank cover, the inspection platform is provided with a through hole, the position of the through hole corresponds to the valve stem, a support rod B is provided on the inspection platform, and a valve opening limit switch is installed on the support rod B; a sensing block is provided on the top of the valve stem, the sensing block cooperates with the valve opening limit switch and the valve closing limit switch, the valve opening limit switch and the valve closing limit switch are both connected to the PLC controller, and the PLC controller is simultaneously connected to the traction mechanism signal.

[0006] Preferably, the support rod A is also equipped with a valve overtravel switch, and the valve closing overtravel switch is located below the valve closing limit switch; the support rod B is also equipped with a valve opening overtravel switch, and the valve opening overtravel switch is located above the valve opening limit switch.

[0007] Preferably, the traction mechanism adopts a winch, and the winch hoists the valve stem through a wire rope.

[0008] Preferably, the distance between the valve closing overtravel switch and the valve closing limit switch is 10-20 mm, and the distance between the valve opening overtravel switch and the valve opening limit switch is 10-20 mm.

[0009] The beneficial effects of the utility model are as follows: 1. It can avoid the change of the shut-off valve stroke due to the deformation of the wire rope, and realize the valve stem to accurately reach the safe stroke position, providing effective guarantee for safe production; 2. One operator can open and close the valve, which is more convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0011] Figure 2 It is the front view of the utility model;

[0012] Figure 3 yes Figure 2 Left view of

[0013] Figure 4 yes Figure 2 AA view;

[0014] Figure 5 This is a schematic diagram of the circuit connection principle of the utility model;

[0015] In the figure: 1. Gas tank cover; 2. Valve stem; 3. Support rod A; 4. Valve closing overtravel switch; 5. Valve closing limit switch; 6. Maintenance platform; 7. Support rod B; 8. Valve opening limit switch; 9. Valve opening overtravel switch; 10. Valve cover. DETAILED DESCRIPTION

[0016] See also Figure 1-4 The present embodiment is a blast furnace gas shut-off valve with improved positioning accuracy, comprising a gas storage tank cover 1, a vertically arranged valve stem 2 is installed on the top of the gas storage tank cover 1, the top of the valve plate passes upward and is connected to the traction mechanism, a valve cover 10 is installed on the bottom of the valve stem 2, a vertically arranged support rod A3 is installed on the top of the gas storage tank cover 1, and a valve limit switch 5 is installed on the support rod A3; an inspection platform 6 is provided above the gas storage tank cover 1, the inspection platform 6 is provided with a through hole, the position of the through hole corresponds to the valve stem 2, the inspection platform 6 is provided with a support rod B7, and the support rod B7 is provided with a valve opening limit switch 8; a sensing block is provided on the top of the valve stem 2, the sensing block cooperates with the valve opening limit switch 8 and the valve closing limit switch 5, the valve opening limit switch 8 and the valve closing limit switch 5 are both connected to the PLC controller, and the PLC controller is simultaneously connected to the traction mechanism signal.

[0017] Preferably, the support rod A3 is also equipped with a valve overtravel switch 4, and the valve closing overtravel switch 4 is located below the valve closing limit switch 5; the support rod B7 is also equipped with a valve opening overtravel switch 9, and the valve opening overtravel switch 9 is located above the valve opening limit switch 8; the valve opening overtravel switch 9 and the valve closing overtravel switch 4 are both connected to the PLC controller signal.

[0018] Preferably, the traction mechanism adopts a winch, and the winch hoists the valve stem 2 through a wire rope.

[0019] Preferably, the distance between the valve closing overtravel switch 4 and the valve closing limit switch 5 is 10-20 mm, and the distance between the valve opening overtravel switch 9 and the valve opening limit switch 8 is 10-20 mm.

[0020] See also Figure 5 , is the circuit connection principle diagram of the utility model, wherein KM1 is the valve opening contactor, KM2 is the valve closing contactor, L1 is the open position indicator light, L2 is the close position indicator light, K3 is the open position relay, K4 is the close position relay, S1 is the valve opening limit switch 8, S2 is the valve closing limit switch 5, S3 is the valve opening overtravel switch 9, and S4 is the valve closing overtravel switch 4.

[0021] The purpose of setting S3 and S4 is to prevent S1 or S2 from malfunctioning and improve the safety of operation. The working principle of the utility model is as follows: although the steel wire rope will be deformed due to long-term stress, the valve stem 2 has a large stiffness and strength and will not be deformed. Therefore, the utility model uses the position of the valve stem 2 to determine whether the switch valve is in place to improve accuracy. When opening the valve, the traction mechanism pulls the valve stem 2 upward. When the induction block at the top of the valve stem 2 reaches the valve opening limit switch 8, the valve opening limit switch 8 automatically sends a signal to the PLC controller, and the PLC controller sends a signal to the main command controller of the traction mechanism to stop it and maintain the current state; when executing the valve closing action, the valve stem 2 moves downward, the valve stem 2 retracts into the gas tank, and when the induction block at the top of the valve stem 2 reaches the valve closing limit switch 5, a signal is sent to the PLC controller, and the PLC controller sends a signal to the main command controller of the traction mechanism to stop it and maintain the current state.

[0022] If the valve opening limit switch 8 or the valve closing limit switch 5 fails, the corresponding valve opening overtravel switch 9 or valve closing overtravel switch 4 is automatically used as a substitute.

Claims

1. A blast furnace gas shut-off valve with improved positioning accuracy comprises a gas storage tank cover, a vertically arranged valve stem is mounted on the top of the gas storage tank cover, a valve plate top extends upward and is connected to a traction mechanism, and a valve cover is mounted on the bottom of the valve stem, and is characterized in that: A vertically arranged support rod A is installed at the top of the gas tank cover, and a valve limit switch is installed on the support rod A; an inspection platform is provided above the gas tank cover, and the inspection platform is provided with a through hole, the position of the through hole corresponds to the valve stem, and a support rod B is provided on the inspection platform, and a valve opening limit switch is installed on the support rod B; a sensing block is provided at the top of the valve stem, and the sensing block cooperates with the valve opening limit switch and the valve closing limit switch, and the valve opening limit switch and the valve closing limit switch are both connected to the PLC controller, and the PLC controller is simultaneously connected to the traction mechanism signal.

2. The blast furnace gas shut-off valve with improved positioning accuracy according to claim 1, characterized in that: The support rod A is also equipped with a valve overtravel switch, and the valve closing overtravel switch is located below the valve closing limit switch; the support rod B is also equipped with a valve opening overtravel switch, and the valve opening overtravel switch is located above the valve opening limit switch.

3. The blast furnace gas shut-off valve with improved positioning accuracy according to claim 1, characterized in that: The traction mechanism adopts a winch, and the winch hoists the valve stem through a steel wire rope.

4. The blast furnace gas shut-off valve with improved positioning accuracy according to claim 2, characterized in that: The distance between the valve closing overtravel switch and the valve closing limit switch is 10-20 mm, and the distance between the valve opening overtravel switch and the valve opening limit switch is 10-20 mm.

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