A manhole door device for preventing air leakage in sintered large flue

Abstract

The utility model discloses a manhole door device for preventing air leakage in a sintering large flue, comprising a door frame, the door frame having an inner inspection hole and an outer inspection hole, the size of the inner inspection hole being smaller than that of the outer inspection hole, an inner manhole door being hinged at the inner inspection hole, and an outer manhole door being hinged at the outer inspection hole; wherein at least one first locking mechanism is arranged on the circumference of the inner manhole door, the inner manhole door is locked and connected with the inner side of the door frame through the first locking mechanism, and at least one second locking mechanism is arranged on one side of the outer manhole door, the outer manhole door is locked and connected with one side of the door frame through the second locking mechanism. The manhole door device adopts an inner and outer double-layer sealed manhole structure, adds a manhole door in the form of preventing air leakage on the side inspection manhole of the sintering large flue, and has the safety conditions for opening and closing at the same time, and eliminates the air leakage phenomenon of the flue inspection manhole through the modification of the closed door of the manhole of the sintering large flue, and improves the control of the process link.

Description

Technical Field

[0001] This utility model relates to the field of sintering flue technology, and in particular to a leak-proof manhole door device for sintering large flues. Background Technology

[0002] The sintering exhaust system consists of the sintering machine's air box, air box branch pipes, main flue, gravity dust collector and ash discharge valve, as well as electrostatic precipitator, exhaust fan, centrifugal fan, regulating and control valves, chimney, etc.

[0003] The main function of the main flue is to collect sintering exhaust gases from each air box and direct them to the dust collector. Air leakage in the sintering exhaust system is primarily caused by equipment and operational defects. Currently, the air leakage rate of sintering machines in China is generally around 50% or even higher. Therefore, effectively reducing the air leakage rate is a crucial measure for reducing energy consumption in the sintering process and improving sintering output and quality.

[0004] The existing maintenance manholes of sintering flues are usually single-layer closed structures, which are circular planar structures sealed with iron plates. The iron plates are surrounded by asbestos ropes, and the bolts around the closed iron plate door are tightened to achieve the function of sealing and preventing air leakage. However, the actual effect is poor, and air leakage often occurs at the pressure plate position, which affects the process of cold air intake in the sintering process and causes process impact. Utility Model Content

[0005] The purpose of this invention is to solve the above-mentioned problems by designing a leak-proof manhole door device for sintering flue, which solves the problem that the single-layer sealed manhole used in the sintering flue is prone to air leakage, affecting the sintering process.

[0006] To achieve the above objectives, the technical solution of this utility model is a sintering flue anti-leakage manhole door device, comprising a door frame, the door frame having an inner inspection hole and an outer inspection hole, the size of the inner inspection hole being smaller than the size of the outer inspection hole, an inner manhole door being hinged at the inner inspection hole, and an outer manhole door being hinged at the outer inspection hole. When both the outer manhole door and the inner manhole door are in the closed state, a sealed space is formed on the inner side of the door frame between the inner manhole door and the outer manhole door.

[0007] The inner manhole door is provided with at least one first locking mechanism in the circumferential direction, and the inner manhole door is locked to the inner side of the door frame through the first locking mechanism. The outer manhole door is provided with at least one second locking mechanism on one side, and the outer manhole door is locked to the side of the door frame through the second locking mechanism.

[0008] Preferably, the inner manhole door includes an inner door panel and a first sealing part, and a connecting ring that mates with the first sealing part extends outward from the inner inspection hole, and the first sealing part is sealed to the connecting ring.

[0009] Preferably, the inner manhole door is rotatably connected to the pivot on the outside of the connecting ring, and one side of the outer manhole door is rotatably connected to the pivot on the outside of the door frame.

[0010] Preferably, the first locking mechanism includes a stop member, a locking screw, and a locking member, wherein the stop member is disposed in the circumferential direction of the inner door panel, one end of the locking screw is hinged to the outer side of the connecting ring, and the other end passes through the stop member, and the locking member is threadedly connected to the locking screw and abuts against the stop member;

[0011] Alternatively, the locking screw is circumferentially connected to the inner door panel, with one end of the locking screw hinged to the inner door panel. The stop member is disposed on the outer wall of the connecting ring circumferentially. The locking member is threadedly connected to the locking screw and abuts against the stop member.

[0012] Preferably, the first locking mechanism includes a locking bolt and a locking nut, wherein the inner door panel and the connecting ring are provided with locking holes in the circumferential direction that match the number of the first locking mechanism, and one end of the locking bolt passes through the locking holes on the inner door panel and the connecting ring in sequence and is threadedly connected to the locking nut.

[0013] Preferably, a handle is provided on the outer side of the inner door panel.

[0014] Preferably, the manhole door includes an outer door panel and a second sealing part, the second sealing part being disposed on the inner side of the outer door panel and sealingly connected to the manhole door.

[0015] Preferably, the second locking mechanism includes a rotating pin, a handle, and a stop plate, wherein the rotating pin is rotatably connected to the outer door panel, and one end of the rotating pin passes through the outer door panel and is fixedly connected to the stop plate, the other end of the rotating pin is fixedly connected to the handle, and the stop plate can rotate together with the rotating pin and can engage with the inner sidewall of the door frame.

[0016] Preferably, a sealing strip is provided around the inner side of the inner manhole and the outer manhole in the circumferential direction.

[0017] Its advantages over existing technologies are:

[0018] This utility model's manhole door device adopts a double-layer sealed manhole structure, adding an air-leakage-proof manhole door to the side inspection manhole of the sintering flue. This sealed manhole door device also provides safe opening and closing conditions. The inner manhole door, located at the inner inspection hole, is locked and sealed by a first locking mechanism, while the outer manhole door, located at the outer inspection hole, is locked and sealed by a second locking mechanism. Thus, if air leakage occurs at either the inner or outer manhole door, the other door provides a seal. By modifying the sealing door of the sintering flue manhole, air leakage at the flue inspection manhole is eliminated, improving process control. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the manhole door device in the open state in Embodiment 1;

[0020] Figure 2 This is a schematic diagram of the manhole door device in the closed state in Embodiment 1;

[0021] Figure 3 This is a cross-sectional view of the manhole door device in Embodiment 1;

[0022] Figure 4 This is a schematic diagram of the internal manhole door in Example 1;

[0023] Figure 5 This is a schematic diagram of the connecting ring in Example 1;

[0024] Figure 6 This is a schematic diagram of the first locking mechanism in Embodiment 1;

[0025] Figure 7 This is a schematic diagram of the second locking mechanism in Embodiment 1;

[0026] Figure 8 This is a schematic diagram of the first locking mechanism in Embodiment 2.

[0027] In the diagram, 1 is the door frame; 2 is the external manhole door; 21 is the outer door panel; 22 is the second sealing part; 3 is the rotating shaft; 4 is the second locking mechanism; 41 is the rotating pin; 42 is the handle; 43 is the stop plate; 5 is the internal manhole door; 51 is the inner door panel; 52 is the first sealing part; 6 is the stop piece; 7 is the locking screw; 8 is the locking piece; 9 is the connecting ring; 10 is the handle; 11 is the locking bolt; 12 is the locking nut; and 501 is the locking hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0029] Example 1

[0030] like Figure 1 and Figure 2 As shown, a preferred embodiment of this utility model proposes a leak-proof manhole door device for sintering flue. This manhole door device is mainly installed on the sintering flue and has a dual leak-proof function. It is used for personnel to inspect the interior of the sintering flue. It mainly includes components such as a door frame 1, an inner manhole door 5, and an outer manhole door 2. The inner inspection hole is located on the inner side of the door frame 1, and the outer inspection hole is located on the outer side of the door frame 1. The inner inspection hole is smaller than the outer inspection hole. The inner manhole door 5 is installed at the inner inspection hole, and the outer manhole door 2 is installed at the outer inspection hole. Moreover, the inner manhole door 5 is also smaller than the outer manhole door 2. The inner manhole door 5 and the outer manhole door 2 together form a double sealing structure. Once an air leak occurs at the inner manhole door 5, the outer manhole door 2 can also play a sealing role.

[0031] In this embodiment, the inner manhole door 5 is circular and the outer manhole door 2 is square. Of course, both the inner manhole door 5 and the outer manhole door 2 can be designed as square, or both the inner manhole door 5 and the outer manhole door 2 can be designed as circular.

[0032] like Figure 4 As shown, in this embodiment, the inner manhole door 5 consists of two parts: an inner door panel 51 and a first sealing part 52. The first sealing part 52 is formed by protruding outward along the side of the inner door panel 51, and a fixing plate is provided on the inner door panel 51.

[0033] refer to Figure 1 , Figure 3 A circular connecting ring 9 extends outward from the inner inspection hole of the door frame 1. The fixing plate is rotatably connected to the rotating shaft 3 located outside the connecting ring 9. The diameter of the first sealing part 52 is approximately the same as the inner diameter of the connecting ring 9. When the inner manhole door 5 is closed, the first sealing part 52 can be inserted into the connecting ring 9 to form a seal. A handle 10 is also provided on the inner door panel 51 to open or close the inner manhole door 5.

[0034] refer to Figure 1 , Figure 4 , Figure 5At least one first locking mechanism is provided on the circumference of the inner door panel 51, and there are usually multiple locking mechanisms. In this embodiment, the first locking mechanism is composed of a stop member 6, a locking screw 7, and a locking member 8. The stop member 6 is composed of two parallel plates, and the distance between the two plates is not less than the diameter of the locking screw 7. One end of the locking screw 7 is hinged to the outer wall of the connecting ring 9, and the other end is threaded to the locking member 8. By flipping the locking screw 7, the locking screw 7 passes between the two plates of the stop member 6. Then, the locking member 8 is rotated so that the locking member 8 abuts against the two plates of the stop member 6, thus locking the inner manhole door 5.

[0035] In this embodiment, the stop member 6 can also be set on the outer wall of the connecting ring 9. One end of the locking bolt 11 is hinged to the outer periphery of the inner door panel 51, and the other end is hinged to the locking member 8. In fact, it is just a matter of switching the installation position with the first installation method. The function is the same. By flipping the locking bolt 11, the locking bolt 11 passes through the middle of the stop member 6. Then the locking member 8 is tightened so that the locking member 8 abuts against the stop member 6, thereby locking the inner manhole door 5.

[0036] like Figure 1 As shown, the external manhole door 2 is composed of an outer door panel 21 and a second sealing part 22. The second sealing part 22 is formed by protruding outward from the inner side of the outer door panel 21. When the external manhole door 2 is in the closed state, the second sealing part 22 can be inserted into the external inspection hole on the door frame 1 to form a seal. At least one second locking mechanism 4 is provided on one side of the external manhole door 2, generally two, one on top and one on the bottom. At the same time, a pivot 3 is also provided on one side of the outer side of the door frame 1. One side of the external manhole door 2 is hinged to the pivot 3 to realize the opening and closing of the external manhole door 2.

[0037] refer to Figure 7 The aforementioned second locking mechanism 4 consists of a rotating pin 41, a handle 42, and a stop piece 43. The rotating pin 41 passes through the outer door panel 21 and the second sealing part 22 in sequence and is rotatably connected to them. The handle 42 is fixedly connected to the outer end of the rotating pin 41. The stop piece 6 is fixedly connected to the inner end of the rotating pin 41. The stop piece 6 is fan-shaped and is part of a circle. When the manhole door 2 is closed, the rotating pin 41 is rotated by turning the handle 42, which drives the stop piece 43 to rotate, so that the stop piece 43 can engage with the door frame 1, thus locking the manhole door 2.

[0038] In this embodiment, when the inner manhole door 5 and the outer manhole door 2 are closed, a sealed space can be formed between the inner manhole door 5 and the outer manhole door 2. If the inner manhole door 5 or the outer manhole door 2 leaks air, the other door can also play a role in sealing and preventing air leakage, thereby improving the sealing effect of the maintenance manhole.

[0039] In this embodiment, a sealing strip is provided around the second sealing part 22 of the external manhole door 2 and around the first sealing part 52 of the internal manhole door 5 to enhance the sealing.

[0040] In this example, one or two sets of maintenance manholes are first added to one side of the enclosed cylindrical flue to facilitate maintenance personnel entering the interior to clean up accumulated materials and debris. The manholes of the sintering flue are generally about 1.5 meters in diameter, which can allow personnel to enter and exit for maintenance and to transport maintenance materials. The cross-sectional diameter and cylinder length of the sintering flue are designed according to the sintering area and ventilation capacity to meet the sintering process standards and requirements.

[0041] In this example, the manhole door device adopts a double-layer sealed manhole structure, with both the inner and outer manhole doors having opening and closing functions, which greatly improves the air leakage prevention capability of the manhole door device.

[0042] Example 2

[0043] like Figure 8 As shown, the difference between this embodiment and embodiment 1 is that the structure of the first locking mechanism is different from that of embodiment 1, while the other structures are the same as those of embodiment 1. In embodiment 2, the first locking mechanism is composed of a locking bolt 11 and a locking nut 12. A ring of locking holes 501 is provided on the circumference of the inner door panel 51 and the circumference of the connecting ring 9. By passing the locking bolt 11 through the locking holes 501 on the inner door panel 51 and the connecting ring 9, and then tightening the locking nut 12, the inner manhole door 5 can be locked.

[0044] The above technical solution only embodies the preferred technical solution of this utility model. Any changes that may be made by those skilled in the art to certain parts of it embody the principle of this utility model and fall within the protection scope of this utility model.

Claims

1. A sintered large flue anti-leakage manhole door device, comprising a door frame (1), characterized in that: The door frame (1) has an inner inspection hole and an outer inspection hole, the size of the inner inspection hole is smaller than that of the outer inspection hole, an inner manhole door (5) is hingedly connected to the inner inspection hole, and an outer manhole door (2) is hingedly connected to the outer inspection hole, and when the outer manhole door (2) and the inner manhole door (5) are both in a closed state, a closed sealed space is formed on the inner side of the door frame (1) between the inner manhole door (5) and the outer manhole door (2); At least one first locking mechanism is provided on the circumference of the inner manhole door (5), and the inner manhole door (5) is locked and connected to the inner side of the door frame (1) through the first locking mechanism; at least one second locking mechanism (4) is provided on one side of the outer manhole door (2), and the outer manhole door (2) is locked and connected to one side of the door frame (1) through the second locking mechanism (4).

2. A sintered large flue anti-leakage manhole door device according to claim 1, characterized in that: The inner manhole door (5) comprises an inner door plate (51) and a first sealing portion (52); a connecting ring (9) matching with the first sealing portion (52) is formed extending outward from the inner inspection hole; the first sealing portion (52) is sealingly connected to the connecting ring (9).

3. A sintering large flue anti-leakage manhole door device according to claim 2, characterized in that: The inner manhole door (5) is rotatably connected to the rotating shaft (3) outside the connecting ring (9), and one side of the outer manhole door (2) is rotatably connected to the rotating shaft (3) outside the door frame (1).

4. A sintering large flue anti-leakage manhole door device according to claim 2, characterized in that: The first locking mechanism comprises a stopper (6), a locking screw (7) and a locking member (8), wherein the stopper (6) is arranged on the circumference of the inner door panel (51), one end of the locking screw (7) is hinged to the outer side of the connecting ring (9), and the other end passes through the stopper (6), and the locking member (8) is threadedly connected to the locking screw (7) and abuts against the stopper (6); Alternatively, the locking screw (7) is circumferentially connected to the inner door panel (51) and one end of the locking screw (7) is hinged to the inner door panel (51), the stop member (6) is arranged on the outer wall of the connecting ring (9) in the circumferential direction, and the locking member (8) is threadedly connected to the locking screw (7) and abuts against the stop member (6).

5. A sintering large flue anti-leakage manhole door device according to claim 2, characterized in that: The first locking mechanism comprises a locking bolt (11) and a locking nut (12), wherein the inner door plate (51) and the connecting ring (9) are provided with locking holes (501) in a circumferential direction thereof, the number of which matches that of the first locking mechanism, and one end of the locking bolt (11) passes through the locking holes (501) on the inner door plate (51) and the connecting ring (9) in sequence and is threadedly connected to the locking nut (12).

6. A sintering large flue anti-leakage manhole door device according to claim 2, characterized in that: A handle (10) is provided on the outer side of the inner door panel (51).

7. A sintering large flue anti-leakage manhole door device according to claim 1, characterized in that: The outer manhole door (2) comprises an outer door plate (21) and a second sealing portion (22); the second sealing portion (22) is arranged on the inner side of the outer door plate (21) and is sealed and connected to the outer manhole door (2).

8. A sintering large flue anti-leakage manhole door device according to claim 7, characterized in that: The second locking mechanism (4) comprises a rotating pin (41), a handle (42) and a stop plate (43), wherein the rotating pin (41) is rotatably connected to the outer door panel (21), and one end of the rotating pin (41) passes through the outer door panel (21) and is fixedly connected to the stop plate (43), and the other end of the rotating pin (41) is fixedly connected to the handle (42), and the stop plate (43) can rotate with the rotating pin (41) and can be clamped with the inner wall of the door frame (1).

9. A sintering large flue anti-leakage manhole door device according to claim 1, characterized in that: A circle of sealing strips is arranged along the circumferential direction on the inner sides of the inner manhole door (5) and the outer manhole door (2).

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