A combined side sealing device for a sintering machine

Abstract

The present application relates to a kind of sintering machine composite side sealing device, the present application is provided with two sealing structures in the side of sintering machine, respectively contact type equidistant slide sealing assembly and telescopic spring support plate contact sealing assembly.Equidistant slide sealing assembly of contact type relies on the mutual cooperation between upper and lower slide structure, forms close horizontal surface contact and circuitous labyrinth structure, can change the flow direction of wind, increase the flow resistance of wind.Telescopic spring support plate contact sealing assembly mainly relies on spring compression to make sealing plate and L type plate surface close contact, in the sintering process, L type plate is moving, in order to reduce the friction of contact surface, a self-lubricating system is designed, so that the contact surface is in lubricated state, can reduce wear, prolong the service life of device.Therefore, the whole side sealing device has higher practical value.

Description

Technical Field

[0001] This invention relates to the field of iron ore sintering equipment technology, and in particular to a composite side sealing device for a sintering machine. Background Technology

[0002] Air leakage in the sintering machine has a significant impact on various technical indicators of the sintering production process. To reduce the leakage rate, it is essential to first understand the various leakage points in the sintering machine. The leakage areas of the sintering system include four parts: the sintering machine system, the dual valve system, the piping system, and the dust removal system. Among these, the sintering machine system, specifically the section from the sintering material surface to the branch pipe of the air box, accounts for 65% to 70% of the total air leakage in the entire exhaust system. This is a crucial area for leak sealing, including leaks in important parts such as the machine head, machine tail, trolley traveling plates and slides, trolley side walls, air box, and valves. Among these, the machine head, machine tail, and trolley side walls have the most serious leakage problems, directly affecting the quality and output of sintered ore.

[0003] Existing side sealing methods for sintering machines include double-leaf spring seals, magnetohydrodynamic (MHD) seals, hydraulic seals, and labyrinth-type slide seals. Double-leaf spring seals use two longitudinal leaf springs instead of traditional helical springs, with the two leaf springs running through the entire device, providing a certain degree of sealing. However, due to the gaps, high-concentration dust quickly enters the limited movement space of the leaf springs, hindering the vertical movement of the sealing plate. Furthermore, the insufficient elasticity of the longitudinal leaf springs leads to the double-leaf springs failing to function properly in the later stages. Magnetohydrodynamic (MHD) seals are used for sealing the trolley slide and the trolley end face along the entire length of the sintering machine. This structure seals the bellows and trolley wheels as a whole, forming a single sealed cavity. Under negative pressure, the trolley drives the sealing plate to move within the magnetohydrodynamic groove. Due to the presence of a high-strength magnet, the magnetohydrodynamic fluid is not squeezed out of the groove. However, this single MHD sealing method cannot guarantee high sealing performance. The structure of the labyrinth slide seal differs from that of the conventional slide seal. Its main feature is the elimination of the slide plate and the use of multiple pairs of sealing side plates arranged in the vertical direction, thus forming a labyrinth slide seal. Due to its simple structure, the labyrinth structure cannot effectively increase the air flow resistance and cannot guarantee that the sealing device has good sealing performance.

[0004] In summary, the existing side sealing device of the sintering machine has a simple structure but some defects. It cannot guarantee a high level of sealing on the side of the sintering machine, and there is still room for further improvement and perfection. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a composite side sealing device for a sintering machine. Two sealing structures are introduced on the side of the sintering machine: a contact-type equidistant slide assembly and a retractable spring support plate contact sealing assembly. These two sealing lines effectively reduce the air leakage rate on the side of the sintering machine.

[0006] The technical solution adopted in this invention is as follows:

[0007] The present invention proposes a composite side sealing device for a sintering machine, comprising a contact-type equidistant slide assembly and a retractable spring support plate contact sealing assembly; the contact-type equidistant slide assembly is respectively disposed between the bottom grooves at both ends of the trolley and the top side of the air box; the retractable spring support plate contact sealing assembly is located below the contact-type equidistant slide assembly, and its two ends are respectively connected to the air box and the trolley.

[0008] The contact-type equidistant slide assembly includes an upper slide structure and a lower slide structure; the upper slide structure is disposed in the bottom groove of the trolley, and its top is fixedly connected to the bottom groove of the trolley; the lower slide structure is slidably connected inside the upper slide structure along the running direction of the trolley and is fixedly connected to one side of the top of the bellows.

[0009] The retractable spring support plate contact sealing assembly includes a guide rail, a spring, a sealing plate, an L-shaped plate, and a fixing plate. The fixing plate is located below the sliding track structure and its inner end is fixedly connected to the air box. The guide rails are respectively arranged laterally on the upper and lower sides of the outer end face of the fixing plate. The sealing plate has a concave structure, and its open end is slidably connected to the upper and lower guide rails respectively. The L-shaped plate is located at the outer end of the sealing plate, and one end of the L-shaped plate is fixedly connected to the inner side of the trolley wheel, while the other end is in close contact with the outer end face of the sealing plate. The spring is located between the fixing plate and the sealing plate and is always in a compressed state.

[0010] Furthermore, the left and right sides of the upper slide structure and the lower slide structure are both corresponding concave and convex structures.

[0011] Furthermore, the contact surfaces of the upper and lower slide structures are coated with a layer of flexible graphite of uniform thickness.

[0012] Furthermore, the contact surfaces of the L-shaped plate and the sealing plate are coated with a flexible graphite layer of a certain thickness.

[0013] Furthermore, an oil storage tank is provided on one side of the sealing plate, which stores lubricating oil; an oil delivery pipe is machined inside the outer side of the sealing plate, one end of the oil delivery pipe is connected to the oil storage tank, and a small-diameter oil outlet is opened on the surface of the sealing plate that contacts the L-shaped plate, which is connected to the other end of the oil delivery pipe.

[0014] Furthermore, the L-shaped plate is made of a lightweight and wear-resistant material.

[0015] Furthermore, the lubricating oil is a high-viscosity grease.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This invention utilizes replaceable parts and bolted connections in multiple places, allowing for quick replacement of severely worn parts and reducing maintenance time. The contact between the horizontal surfaces of the upper and lower sliding tracks effectively improves the device's sealing performance, and the two structures work together to form a meandering labyrinthine channel, increasing airflow resistance by altering the airflow direction. In addition to the contact-type equidistant sliding track seal, the retractable spring support plate acts as a second line of defense, blocking the air inlet through tight contact between the sealing plate and the L-shaped plate. Compared to previous single-layer leak-proof structures, this invention employs a double-sealing structure, providing tight leak protection on the sides of the sintering machine, which is beneficial for improving the quality and yield of sintered ore. Furthermore, this invention uses flexible graphite and lubricating oil to solve the problem of severe wear, effectively extending the overall lifespan of the sealing device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a sensor-based micro-negative pressure control device for an ignition furnace proposed in this invention.

[0019] Figure 2 yes Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;

[0020] Figure 3 yes Figure 1 A magnified schematic diagram of the local structure at point B;

[0021] Figure 4 yes Figure 3 Schematic diagram of the contact surface structure of the middle sealing plate.

[0022] In the attached drawings, the following symbols are used: 1-Trolley; 2-Sintered material layer; 3-Blowbox; 4-Large diameter bolt; 5-Trolley wheel; 6-Upper slide rail structure; 7-Small diameter bolt; 8-Lower slide rail structure; 9-Flexible graphite; 10-Bottom groove; 11-Guide rail; 12-Spring; 13-Oil storage tank; 14-Flexible graphite layer; 15-L-shaped plate; 16-Oil pipeline; 17-Sealing plate; 18-Oil outlet; 19-Fixing plate. Detailed Implementation

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] It should be noted that in the description of this invention, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not mean that the device or element must have a specific orientation, or be constructed and operated in a specific orientation.

[0025] See appendix Figure 1 This paper presents a specific structure of an embodiment of a composite side sealing device for a sintering machine proposed in this invention. The device includes a contact-type equidistant slide assembly and a retractable spring support plate contact sealing assembly. The contact-type equidistant slide assembly is respectively disposed between the bottom grooves 10 at both ends of the trolley 1 and the top sides corresponding to the air box 3. The retractable spring support plate contact sealing assembly is located below the contact-type equidistant slide assembly, and its two ends are respectively connected to the air box 3 and the trolley 1. The two sealing assemblies cooperate to form two lines of defense, improving the air leakage prevention performance of the side of the sintering machine sealing device.

[0026] As attached Figure 2 As shown, the contact-type equidistant slide assembly includes an upper slide structure 6, a small-diameter bolt 7, a lower slide structure 8, and flexible graphite 9. The upper slide structure 6 is disposed in the bottom groove 10 of the trolley, and the top of the upper slide structure is fixedly connected to the inner end face of the top of the bottom groove 10 of the trolley by the small-diameter bolt 7. The lower slide structure 8 is slidably connected inside the upper slide structure 6 along the running direction of the trolley 1 and fixedly connected to one side of the top of the air box 3 by the large-diameter bolt 4. In this embodiment, the left and right sides of the upper slide structure 6 and the lower slide structure 8 are both provided with corresponding concave and convex structures, and the horizontal contact surfaces of the upper slide structure 6 and the lower slide structure 8 are coated with a layer of flexible graphite 9 of uniform thickness.

[0027] Since the upper slide structure 6 is installed at the bottom of the trolley 1, and the trolley 1 moves during the sintering process, it means that the upper slide structure 6 is also moving. The cooperation between the upper slide structure 6 and the lower slide structure 8 is dynamic. The upper slide structure 6 slides on the lower slide structure 8 along with the trolley 1. Since the horizontal surfaces of both the upper slide structure 6 and the lower slide structure 8 are coated with a layer of flexible graphite 9 of uniform thickness, when the two structures come into contact with each other, the contact surfaces of the two structures will not experience significant wear. Moreover, the flexible graphite 9 has the functions of lubrication and sealing, which helps to improve the sealing performance of the device.

[0028] When the upper slide structure 6 and the lower slide structure 8 of this invention cooperate, they form a meandering labyrinthine channel. This labyrinthine channel can change the direction of airflow, increase airflow resistance, and effectively reduce the leakage rate of the sealing device. Since the upper slide structure 6 slides on the lower slide structure 8 along with the trolley 1, the design needs to consider the fitting accuracy of the upper slide structure 6 and the lower slide structure 8. The more contact surfaces the two structures have, the higher the required fitting accuracy and the greater the production cost. In this embodiment, eight contact surfaces are used, requiring a high fitting accuracy. In actual production, the number of contact surfaces between the upper slide structure 6 and the lower slide structure 8 can be reduced, maintaining a certain gap between other horizontal surfaces, reducing the fitting accuracy, effectively reducing production costs, and lowering the failure rate during production.

[0029] Furthermore, both the upper slide structure 6 and the lower slide structure 8 in this invention are bolted together. When the structure is severely worn, the slide structure with the same function can be quickly disassembled and installed, which effectively improves the maintenance efficiency of the sintering machine sealing device.

[0030] As attached Figure 3 and 4 As shown, the retractable spring support plate contact sealing assembly includes a guide rail 11, a spring 12, an oil storage tank 13, a flexible graphite layer 14, an L-shaped plate 15, an oil pipeline 16, a sealing plate 17, an oil outlet 18, and a fixing plate 19. The fixing plate 19 is positioned below the sliding track structure 8 along the running direction of the trolley 1, and the inner end face of the fixing plate 19 is fixed to the side of the air box 3 by bolts. The guide rail 11 is respectively arranged laterally on the upper and lower sides of the outer end face of the fixing plate 19. The sealing plate 17 has a concave structure. The two sides of its opening end are respectively slidably connected to the upper and lower guide rails 11; the L-shaped plate 15 is set at the outer end of the sealing plate 17; the L-shaped plate is made of lightweight and wear-resistant material, and the horizontal end of the L-shaped plate 15 is fixed to the inner side of the trolley wheel 5, and the vertical end is in close contact with the outer end face of the sealing plate 17, and the contact surfaces of the L-shaped plate 15 and the sealing plate 17 are coated with a flexible graphite layer 14 of a certain thickness; the spring 12 is set between the fixed plate 19 and the sealing plate 17, and is always in a compressed state.

[0031] An oil storage tank 13 is provided on the outside of the sealing plate 17. The oil storage tank 13 is used to store lubricating oil. The lubricating oil needs to have a certain viscosity, such as high-viscosity grease, to prevent the lubricating oil from flowing away quickly during the lubrication process. Several evenly distributed oil delivery pipes 16 are vertically machined inside the outer end face of the sealing plate 17. One end of the oil delivery pipe 16 is connected to the oil storage tank 13, and a small-diameter oil outlet 18 is opened on the surface of the sealing plate 17 that contacts the L-shaped plate 15, which is connected to the other end of the oil delivery pipe 16.

[0032] During the operation of the sintering machine, the sealing plate 17 and the L-shaped plate 15 are always in close contact, and the spring 12 connected to the sealing plate 17 is in a compressed state for a long time. The sealing plate 17 moves left and right in the guide rail 11. When gas flows in from the gap between the sealing plate 17 and the L-shaped plate 15, it forces the spring 12 to compress, and the sealing plate 17 moves left and right. The kinetic energy of the air is converted into the potential energy of the spring 12, which increases the loss of air kinetic energy and effectively reduces the air leakage rate of the sealing device. In addition, since both the surface of the sealing plate 17 and the surface of the L-shaped plate 15 are coated with a flexible graphite layer 14 of a certain thickness, the flexible graphite layer 14 has the characteristics of sealing and lubrication. When the two surfaces are in close contact, the contacting flexible graphite layer 14 effectively prevents air from flowing in from the gap.

[0033] Since the L-shaped plate 15 is installed at the bottom of the trolley 1, and the trolley 1 moves during the sintering process, the contact between the L-shaped plate 15 and the sealing plate 17 is dynamic, and the contact surface is relatively large. Even with a flexible graphite layer 14 of a certain thickness coated on both contact surfaces, the friction is still high, severely affecting the service life of the sealing plate 17 and the L-shaped plate 15. Therefore, this invention modifies the traditional sealing plate 17 by machining multiple oil delivery pipes 16 inside it, and installing an oil storage tank 13 outside the sealing plate 17. Lubricating oil with a certain viscosity is delivered to the contact surface of the sealing plate 17 via the oil delivery pipes 16. Multiple small-diameter oil outlets 18 are machined on the surface of the sealing plate 17, such as... Figure 4 As shown, this reduces the coefficient of friction between the two contact surfaces, effectively reducing the friction between the L-shaped plate 15 and the sealing plate 17, and reducing wear. Operators need to periodically monitor the oil level in the oil tank 13 to prevent insufficient oil, which could lead to dry friction between the sealing plate 17 and the L-shaped plate 15, exacerbating surface wear.

[0034] The specific working process of this invention is as follows:

[0035] The retractable spring support plate contact sealing assembly serves as the first line of defense. Its components, the L-shaped plate 15 and the sealing plate 17, are in close contact during the sintering process, and this contact is dynamic. To reduce wear on both surfaces, lubricating oil is delivered to the contact surfaces through the oil supply pipe 16 inside the sealing plate 17. It is important to note that the oil level in the oil tank 13 needs to be monitored regularly to prevent insufficient oil from causing dry friction between the two contact surfaces and reducing the device's service life. Furthermore, a flexible graphite layer 14 is coated on both contact surfaces to increase airflow resistance. The contact-type equidistant slide assembly is the second line of defense. Its upper slide structure 6 and lower slide structure 8 work together, relying on their contacting horizontal surfaces to block airflow, effectively reducing the device's air leakage rate. A flexible graphite layer 9 is coated on its surface to enhance sealing. The upper slide structure 6 and lower slide structure 8, through their cooperation, form a meandering labyrinthine channel, which alters the airflow trajectory, increases airflow resistance, and effectively reduces the device's air leakage rate.

[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A composite side sealing device for a sintering machine, characterized in that: The device includes a contact-type equidistant slide assembly and a retractable spring support plate contact sealing assembly; the contact-type equidistant slide assembly is respectively disposed between the bottom grooves at both ends of the trolley and the top side of the air box; the retractable spring support plate contact sealing assembly is located below the contact-type equidistant slide assembly, and its two ends are respectively connected to the air box and the trolley. The contact-type equidistant slide assembly includes an upper slide structure and a lower slide structure; the upper slide structure is disposed in the bottom groove of the trolley, and its top is fixedly connected to the bottom groove of the trolley; the lower slide structure is slidably connected inside the upper slide structure along the running direction of the trolley and is fixedly connected to one side of the top of the bellows. The retractable spring support plate contact sealing assembly includes a guide rail, a spring, a sealing plate, an L-shaped plate, and a fixing plate. The fixing plate is located below the sliding track structure and its inner end is fixedly connected to the air box. The guide rails are respectively arranged laterally on the upper and lower sides of the outer end face of the fixing plate. The sealing plate has a concave structure, and its open end is slidably connected to the upper and lower guide rails respectively. The L-shaped plate is located at the outer end of the sealing plate, and one end of the L-shaped plate is fixedly connected to the inner side of the trolley wheel, while the other end is in close contact with the outer end face of the sealing plate. The spring is located between the fixing plate and the sealing plate and is always in a compressed state. The contact surfaces of the L-shaped plate and the sealing plate are coated with a flexible graphite layer of a certain thickness. An oil storage tank is provided on one side of the sealing plate, which stores lubricating oil; an oil delivery pipe is machined inside the outer side of the sealing plate, one end of the oil delivery pipe is connected to the oil storage tank, and a small-diameter oil outlet is opened on the surface of the sealing plate that contacts the L-shaped plate, which is connected to the other end of the oil delivery pipe.

2. The composite side sealing device for a sintering machine according to claim 1, characterized in that: Both the upper and lower slide structures have corresponding concave and convex structures on their left and right sides.

3. A composite side sealing device for a sintering machine according to claim 1 or 2, characterized in that: The contact surfaces of both the upper and lower slide structures are coated with a layer of flexible graphite of uniform thickness.

4. The composite side sealing device for a sintering machine according to claim 1, characterized in that: The L-shaped plate is made of lightweight and wear-resistant material.

5. A composite side sealing device for a sintering machine according to claim 1, characterized in that: The lubricating oil used is a high-viscosity grease.

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