Pneumatic reversing valve sealing device for steel rolling heating furnace

Abstract

The utility model provides a pneumatic reversing valve sealing device for a steel rolling heating furnace, which relates to the technical field of industrial furnaces and comprises a box body, two pneumatic reversing valves are mounted on the box body in parallel, each pneumatic reversing valve comprises a cylinder support, a light cylinder, a valve rod, a valve plate and a valve seat, and an upper port of each valve seat and the bottom end of each valve plate are of a conical structure. According to the design, the bottom end of the valve plate and the upper port of the valve seat are designed to be of a conical structure, a first rigid conical sealing structure is formed, most of high-temperature gas is isolated, the use environment of the sealing rubber strip is improved, the sealing effect is improved, and the service life of the sealing rubber strip is prolonged; the sealing rubber strip is installed on the valve plate instead of being installed on the valve seat traditionally, when the valve plate drives the sealing rubber strip to press downwards, the sealing rubber strip makes contact with the valve seat to form a second sealing structure, the sealing effect can be further improved, the replacement time of the sealing rubber strip can be shortened, and the installation precision of replacement of the sealing rubber strip is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial furnaces, in particular to a pneumatic reversing valve sealing device for a steel rolling heating furnace, which is a necessary device for switching between air and gas pipelines of regenerative heating furnaces in large, medium and small steel enterprises. Background Art

[0002] The reversing system of the steel rolling regenerative heating furnace adopts a cylinder-driven reversing valve to make the air-air smoke and gas-coal smoke reversing, realize reversing combustion, and ensure the normal heat storage of the burner. The steel rolling heating furnace air and gas pipelines are pneumatically switched in a two-position three-way (or three-position four-way) reversing device. The valve body is internally driven by two cylinders to open and close the two valve plates alternately to complete the reversing action. The reversing valve contains a valve stem, a valve plate, a valve seat, and an rubber ring. The valve plate and the valve seat are installed in combination. Most of the valve seats are provided with a sealing rubber ring, as shown in the attached manual. Figure 3 As shown; in the existing sealing form, the sealing rubber ring is installed in the groove on the upper side of the valve seat and is designed to be circular. Since the pneumatic reversing valve operates once every 60 to 90 seconds, the sealing rubber ring is frequently compressed under high temperature conditions and has a short service life. Secondly, replacement must be performed inside the reversing valve body. Due to the narrow operating space, replacement is extremely difficult. The installation accuracy cannot be guaranteed during replacement, resulting in loose sealing. The utility model provides a pneumatic reversing valve sealing device for a steel rolling heating furnace. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention provides a pneumatic reversing valve sealing device for a steel rolling heating furnace, which solves the problems raised by the above-mentioned background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A pneumatic reversing valve sealing device for a steel rolling heating furnace includes a box body, on which two pneumatic reversing valves are installed in parallel, and the two pneumatic reversing valves have the same structure;

[0005] The pneumatic reversing valve includes a cylinder bracket installed on the top of the box body and a light cylinder fixed on the cylinder bracket. The telescopic end of the light cylinder is connected to a valve stem. The bottom end of the valve stem extends into the interior of the box body and is connected to a valve plate. A valve seat is installed in the interior of the box body corresponding to the valve plate. The upper port of the valve seat and the bottom end of the valve plate are both conical structures. The bottom end of the valve plate is engaged in the conical port at the upper end of the valve seat and is adapted thereto, thereby forming a first rigid conical sealing structure.

[0006] A sealing strip is installed at the bottom of the valve plate, located outside the conical end. When the valve plate is pressed down, the sealing strip contacts the valve seat to form a second sealing structure.

[0007] As a further technical solution of the present invention, the valve stem and the box body are slidably connected, and a sealing ring is provided at the connection. The bottom end of the valve stem and the valve plate are fixed by fixing bolts.

[0008] As a further technical solution of the present invention, the two pneumatic reversing valves are installed on the box in the same manner.

[0009] The utility model provides a pneumatic reversing valve sealing device for a steel rolling heating furnace, which has the following beneficial effects compared with the prior art:

[0010] 1. This design of a pneumatic reversing valve sealing device for a steel rolling heating furnace has a conical structure in which the bottom end of the valve plate and the upper port of the valve seat are designed to fit together. Therefore, when the pneumatic reversing valve is closed, the conical portion of the bottom end of the valve plate is stuck in the conical port of the valve seat, realizing a rigid conical sealing structure. The rigid conical sealing structure of this design can achieve the first layer of sealing, which can isolate most high-temperature gases, thereby greatly improving the use environment of the sealing strip, not only further improving the sealing effect, but also extending the service life of the sealing strip.

[0011] 2. The pneumatic reversing valve sealing device for a steel rolling heating furnace designed in this invention changes the traditional installation of the sealing strip on the valve seat to that on the valve plate, which can shorten the replacement time of the sealing strip, improve the installation accuracy of the replacement sealing strip, ensure the sealing performance and extend the service life of the sealing strip. Moreover, when replacing the sealing strip, it is only necessary to remove the valve plate of the pneumatic reversing valve as a whole and move it to the outside of the reversing valve body for replacement. There is ample operating space, and replacement is simple and time-saving. This solves the problem that when traditionally replacing the sealing rubber ring, the operation needs to be performed inside the valve body, resulting in narrow space and difficulty in replacement. Secondly, when the valve plate drives the sealing strip downward, the sealing strip contacts the valve seat to form a second sealing structure, which can further improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of a pneumatic reversing valve sealing device for a steel rolling heating furnace;

[0013] Figure 2 This is a schematic diagram of the installation of a sealing strip in a pneumatic reversing valve sealing device for a steel rolling heating furnace;

[0014] Figure 3 The figure is a schematic diagram of the installation of the sealing rubber ring in the existing pneumatic reversing valve.

[0015] In the figure: 1. Box body; 2. Cylinder bracket; 3. Light cylinder; 4. Valve plate; 5. Sealing strip; 6. Valve seat; 8. Valve stem; 81. Fixing bolt. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-2 The utility model provides a technical solution for a pneumatic reversing valve sealing device for a steel rolling heating furnace: a pneumatic reversing valve sealing device for a steel rolling heating furnace, comprising a box body 1, on which two pneumatic reversing valves are mounted in parallel, the two pneumatic reversing valves having the same structure, and the two pneumatic reversing valves are mounted in the same manner on the box body 1, and the reversing device for pneumatic switching of the air and gas pipelines in the steel rolling heating furnace, namely the pneumatic reversing valve, completes the reversing action by alternately opening and closing the two pneumatic reversing valves.

[0018] The pneumatic reversing valve includes a cylinder bracket 2 installed on the top of the box body 1 and a light cylinder 3 fixed on the cylinder bracket 2. The telescopic end of the light cylinder 3 is connected with a valve stem 8. The valve stem 8 and the box body 1 are slidably connected, and a sealing ring is provided at the connection. The bottom end of the valve stem 8 extends to the interior of the box body 1 and is connected to the valve plate 4. The bottom end of the valve stem 8 and the valve plate 4 are fixed by fixing bolts 81, which is convenient for replacing the sealing strip 5 in the later stage. It is only necessary to unscrew the fixing bolts 81 on the upper part of the valve plate 4, and then move the valve plate 4 and the sealing strip 5 out of the box body 1 as a whole, and replace them directly outside the box body 1. After the sealing strip 5 is replaced, the valve plate 4 and the sealing strip 5 are moved into the box body 1 as a whole and connected to the valve stem 8 of the pneumatic reversing valve. By tightening the fixing bolts 81, the valve plate 4 and the valve stem 8 are fixed and the valve can be put into use.

[0019] A valve seat 6 is installed inside the box body 1 at the valve plate 4. The upper port of the valve seat 6 and the bottom end of the valve plate 4 are both conical structures. The bottom end of the valve plate 4 is engaged in the conical port of the upper end of the valve seat 6 and is adapted thereto. The engaging portion between the bottom end of the valve plate 4 and the valve seat 6 is designed to be a rigid conical structure, and the upper port of the valve seat 6 is also designed to be a conical port. In this way, when the valve plate 4 is engaged on the valve seat 6, the rigid conical structure at the bottom end of the valve plate 4 fits with the conical port of the valve seat 6 to realize the first sealing structure, which can isolate more than 97% of high-temperature gases and greatly improve the use environment of the second layer of sealing rubber ring (i.e., the sealing strip 5). This structure not only improves the sealing effect, but also extends the service life of the sealing strip 5.

[0020] The bottom of the valve plate 4 is located outside the conical end and a sealing strip 5 is installed. When the valve plate 4 is pressed down, the sealing strip 5 contacts the valve seat 6 to form a second sealing structure. The sealing strip 5 is installed on the valve plate 4 to replace the traditional sealing strip fixed on the valve seat 6. The design of the traditional method (such as Figure 3 As shown in FIG, since the sealing rubber ring is installed in the groove on the upper side of the valve seat 6 and the sealing rubber ring is round, during actual operation, the pneumatic reversing valve operates once every 60 to 90 seconds, resulting in frequent compression of the sealing rubber ring under high temperature conditions, resulting in a short service life of the pneumatic reversing valve. When replacing it, it is necessary to operate inside the valve body of the pneumatic reversing valve. Due to the narrow operating space, replacement is extremely difficult. The installation accuracy cannot be guaranteed during replacement, resulting in poor sealing. In this design, the sealing strip 5 is installed on the valve plate 4. In this way, when replacing the sealing strip 5, it is only necessary to remove the valve plate 4 of the pneumatic reversing valve as a whole (or prepare the sealing strip 5 and the valve plate 4 as spare parts in advance), and move them to the outside of the reversing valve for replacement. The operating space is ample, the replacement is simple and the time is short. Secondly, in this design, when the valve plate 4 and the valve seat 6 are closed, the sealing strip 5 contacts the valve seat 6 to form a sealing structure, which can not only improve the installation accuracy of the replacement rubber ring, but also ensure the sealing performance while extending the service life of the rubber ring.

[0021] The working principle of the present utility model is as follows: when in use, the sealing strip 5 is installed on the valve plate 4, and then the valve plate 4 and the sealing strip 5 are moved into the box body 1 as a whole, and connected with the valve stem 8 of the pneumatic reversing valve. By tightening the fixing bolts 81, the valve plate 4 and the valve stem 8 are fixed, and then the valve can be put into use. If the sealing strip 5 needs to be replaced, it is also replaced in the same way;

[0022] During use, when the pneumatic reversing valve is closed, the valve plate 4 is engaged with the valve seat 6, and the rigid conical structure at the bottom end of the valve plate 4 fits with the conical opening of the valve seat 6, realizing the first sealing structure, which can isolate more than 97% of high-temperature gases and greatly improve the use environment of the sealing strip 5. This structure not only improves the sealing effect, but also extends the service life of the sealing strip 5;

[0023] When the valve plate 4 and the valve seat 6 are closed, the sealing strip 5 contacts the valve seat 6 to form a second sealing structure. In addition, since the pneumatic reversing valve operates frequently, the sealing strip 5 is installed on the valve plate 4 instead of the traditional installation method on the valve seat 6. This ensures that when the sealing strip 5 is damaged, it can be better replaced, thereby shortening the replacement time of the sealing strip 5, improving the installation accuracy of the replacement sealing strip 5, ensuring the sealing performance and extending the service life of the sealing strip 5.

[0024] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.

Claims

1. A pneumatic reversing valve sealing device for a steel rolling heating furnace, comprising a box (1), characterized in that: Two pneumatic reversing valves are installed in parallel on the box body (1), and the two pneumatic reversing valves have the same structure; The pneumatic reversing valve comprises a cylinder bracket (2) mounted on the top of a housing (1) and a light cylinder (3) fixed on the cylinder bracket (2); the telescopic end of the light cylinder (3) is connected to a valve stem (8); the bottom end of the valve stem (8) extends to the interior of the housing (1) and is connected to a valve plate (4); a valve seat (6) is mounted in the interior of the housing (1) corresponding to the valve plate (4); the upper end of the valve seat (6) and the bottom end of the valve plate (4) are both conical structures; the bottom end of the valve plate (4) is engaged in the conical opening at the upper end of the valve seat (6) and is adapted thereto, thereby forming a first rigid conical sealing structure; A sealing strip (5) is installed at the bottom of the valve plate (4) outside the conical end. When the valve plate (4) is pressed down, the sealing strip (5) contacts the valve seat (6) to form a second sealing structure.

2. The pneumatic reversing valve sealing device for a steel rolling heating furnace according to claim 1, characterized in that: The valve stem (8) and the box body (1) are connected in a sliding manner, and a sealing ring is provided at the connection. The bottom end of the valve stem (8) and the valve plate (4) are fixed by fixing bolts (81).

3. The pneumatic reversing valve sealing device for a steel rolling heating furnace according to claim 1, characterized in that: The two pneumatic reversing valves are installed on the box body (1) in the same manner.

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