Linear labyrinth / air force combined sealing device for columnar conveying

Abstract

This invention discloses a linear labyrinth / pneumatic conveying combined sealing device for column conveying, comprising a sealing element and an air supply device. The sealing element includes a bracket and a U-shaped sealing plate respectively fixed to adjacent column units. One end of the N-shaped sealing plate is detachably fixed to the bracket, and the other end extends into the bottom of the U-shaped sealing plate. The top of the N-shaped sealing plate has an extension for covering the top of the U-shaped sealing plate, and a barrier plate is detachably fixed between the extension and the top of the U-shaped sealing plate. A flexible pressure plate is provided between one end of the N-shaped sealing plate and the top of the adjacent U-shaped sealing plate. An air duct is formed between the N-shaped sealing plate, the U-shaped sealing plate, the flexible pressure plate, and the barrier plate. The air supply device includes a fan, and one end of the air duct at the head of each column unit is connected to the fan outlet pipe, while the other end is an open structure. This invention constructs four sealing defense lines, which can effectively achieve a sealing effect and significantly reduce material leakage during column conveying.

Description

Technical Field

[0001] This invention relates to a sealing device for a grate cooler, and more particularly to a linear labyrinth / pneumatic conveying combined sealing device for column conveying. Background Technology

[0002] Today, most grate coolers in cement production have been replaced by fourth-generation high-efficiency, leak-free grate coolers. These fourth-generation grate coolers employ a multi-row, step-feed conveyor system, with rows advancing simultaneously and retracting in batches in a reciprocating motion. Compared to third-generation machines, this results in higher conveying efficiency and lower wear. It also eliminates the bottom hopper, reducing construction costs, but requires more stringent sealing between rows.

[0003] The fourth-generation grate cooler uses a multi-row stepping conveyor system with relative movement between rows. Seals are typically installed between rows to prevent powder leakage from the top to the bottom, which could damage the equipment. However, most current seals are labyrinth seals, which cannot completely prevent leakage. Once powder enters the labyrinth gaps, leakage begins, accelerating seal wear and causing severe damage, rendering the equipment inoperable and requiring shutdown for rectification. Furthermore, the small clearance between labyrinth seals requires high-precision manufacturing and has weak deformation resistance. Significant deformation between rows can cause jamming, increasing wear and potentially leading to complete gridlock, ultimately rendering the equipment inoperable.

[0004] CN 218971826 U discloses an inter-row sealing structure for a walking beam cooler, including an L-shaped sealing plate and a U-shaped sealing plate respectively disposed on two adjacent segment beam units. The opening of the U-shaped sealing plate faces downward and covers the upright part of the L-shaped sealing plate; an I-shaped sealing plate is disposed on the outside of the U-shaped sealing plate. This patent strengthens the sides of the U-seal and the locally wear-prone areas at the overlap, making up for shortcomings and improving the service life of the entire seal. However, this patent still focuses on clogging. Even though it discloses airflow from the bottom to the top through a small gap formed between the segment beam units to purge particles and prevent them from entering the labyrinth seal, the gap channel is uneven in size, and powder can easily enter the gap, thus easily causing blockage. After blockage, the airflow is not smooth, and powder can easily move along the gap and enter the bottom air chamber.

[0005] Therefore, there is an urgent need to develop a sealing device that can truly achieve a strong sealing effect and prevent materials from entering the gap. Summary of the Invention

[0006] Purpose of the invention: The purpose of this invention is to provide a linear labyrinth / pneumatic conveying combined sealing device for column conveying that can effectively reduce material leakage.

[0007] Technical Solution: The linear labyrinth / pneumatic conveying combined sealing device for column conveying of the present invention includes a sealing element and an air supply device for supplying air into the sealing element. The sealing element includes a bracket and a U-shaped sealing plate respectively fixed on adjacent column units. One end of an n-shaped sealing plate opposite to the opening of the U-shaped sealing plate is detachably fixed to the bracket, and the other end extends into the bottom of the U-shaped sealing plate. The top of the n-shaped sealing plate is provided with an extension for covering the top of the U-shaped sealing plate. A barrier plate for sealing is detachably fixed between the extension and the top of the U-shaped sealing plate. A flexible pressure plate for sealing is provided between one end of the n-shaped sealing plate fixed on the bracket and the top of the adjacent U-shaped sealing plate. An air duct is formed between the n-shaped sealing plate, the U-shaped sealing plate, the flexible pressure plate, and the barrier plate. The air supply device includes a fan. One end of the air duct at the head of each column unit is connected to the fan outlet pipe, and the other end at the tail of each column unit is an open structure. The fan supplies air into each air duct to blow out the material entering the air duct.

[0008] The system also includes a sealed air chamber for sealing the heads of each row of units. One end of each air duct extends into the sealed air chamber. The air outlet pipe of the fan delivers air through the sealed air chamber to each air duct and exits from the other end of the air duct. The sealed air chamber includes an upper shell located above the sealing element at the head of each row of units. A fixing plate is provided between the upper shell and the sealing element. A lower shell and side partitions are provided below the upper shell. A lower partition is provided at the bottom of each row of units. The upper shell, fixing plate, lower shell, lower partition, and side partitions form a sealed air chamber. The air outlet pipe of the fan passes through the lower shell and communicates with the sealed air chamber.

[0009] The other end of the air duct is open above the feeding section, so that the blown material falls into the feeding section.

[0010] The bottom of the U-shaped sealing plate is provided with a stepped structure; one end of the n-shaped sealing plate extends into the U-shaped sealing plate and onto the higher step, dividing the U-shaped sealing plate into two cavities; the air duct is the cavity corresponding to the lower step; the stepped structure includes a low step and a high step.

[0011] The top of the n-shaped sealing plate is in loose contact with the top of the U-shaped sealing plate. The flexible pressure plate includes an upper pressure plate tightly attached to the top of the U-shaped sealing plate and an elastic plate installed on the inner wall of the support tightly attached to the lower part of the pressure plate; one end of the elastic plate is connected to the support, so that the bottom of the pressure plate is tightly attached to the top of one side of the U-shaped sealing plate. The elastic plate is pressed against the upper end of one side of the U-shaped sealing plate by its elastic force. One function of the flexible pressure plate is sealing, ensuring good sealing performance of the air duct; another function is to prevent material from entering the lower part when the air duct is worn or damaged. The elastic plate is made of elastic material to compensate for deformation between the flexible pressure plate and the U-shaped sealing plate. The upper pressure plate of the flexible pressure plate is made of highly wear-resistant material, which can effectively reduce wear and improve the service life of the component. The flexible pressure plate and the U-shaped sealing plate are elastically connected, which can eliminate the forced wear caused by a hard connection and offset the deformation and wear between rows, ensuring the stability of the seal. An air duct is formed between the n-shaped sealing plate, the U-shaped sealing plate, the flexible pressure plate, and the barrier plate. This air duct can not only eliminate the adverse consequences caused by the deformation of the column, but also provide effective space for conveying materials.

[0012] The barrier plate is a detachable wear-resistant plate. The wear-resistant plate undergoes special treatment, and its hardness is far greater than that of the n-shaped sealing plate.

[0013] The U-shaped sealing plate is connected to the side of the column unit. The bracket and column unit are bolted together for easy installation and positioning. The bracket and N-shaped sealing plate are separate; if the seal wears out, only the N-shaped sealing plate needs to be replaced, saving materials.

[0014] The present invention comprises an n-shaped sealing plate, a U-shaped sealing plate, a flexible pressure plate, and a support, which are specially fitted together to form a linear labyrinth + pneumatic conveying combined sealing device. The support and the U-shaped sealing plate are respectively fixed to adjacent column units; the support serves both a supporting function and reduces the weight of spare parts, saving operating costs. The flexible pressure plate enables seamless operation between columns. The surfaces of the U-shaped and n-shaped sealing plates have a high degree of overlap, specifically at the location of the detachable wear-resistant plate, which effectively reduces the probability of material entering the cavity, ensuring smooth airflow. The mating surfaces of the U-shaped and n-shaped sealing plates are made of hard material using surface hardening technology, specifically surface carburizing treatment, to increase surface hardness and extend the service life of the device. Preferably, the fan parameters are precisely calculated based on the length of the sealing element, the size of the sealing space, and the particle size distribution of the material, and simulated using software to ensure unobstructed airflow and effective material conveying within the airflow.

[0015] Beneficial effects: Compared with the prior art, the present invention achieves the following significant effects: (1) The present invention adopts the strategy of blocking + unblocking. Through the cooperation of the bracket, flexible pressure plate, n-shaped sealing plate, U-shaped sealing plate, partition plate, fan and air duct, four sealing defense lines are formed, namely: the cooperation between the extension of the n-shaped sealing plate and the top of the U-shaped sealing plate forms the first sealing defense line; the air duct formed between the n-shaped sealing plate 1, U-shaped sealing plate 2, flexible pressure plate 3 and the partition plate is filled with high-pressure gas, forming the second sealing defense line; the labyrinth seal formed between the n-shaped sealing plate 1 and the lower part of the U-shaped sealing plate 2 forms the third defense line; and the flexible pressure plate and the U-shaped sealing plate have no gap, blocking the material from entering the lower equipment, forming the fourth defense line. The above four sealing defense lines of the present invention block or transport the material that enters the gap, effectively solving the problem of material leakage in the column. (2) Each seal of the present invention is inserted into the sealed air chamber. The blower supplies air to each air duct through the sealed air chamber, forming a strong dredging effect on the material. Each air duct of the present invention is set up independently and does not interfere with each other. If any one air duct has a problem, the other air ducts will not be affected. (3) The tail of the seal of the device of the present invention is set in the feeding section, which can allow the high pressure airflow to directly send the material blown out of the air duct to the feeding point. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the structure between two adjacent column units of the device of the present invention;

[0017] Figure 2a This is a schematic diagram of the overall structure of the device of the present invention;

[0018] Figure 2b This is a schematic cross-sectional view of the device of the present invention;

[0019] Figure 3 This is a schematic diagram of the air duct structure of the device of the present invention;

[0020] Figure 4 for Figure 3 Schematic diagram of the AA surface structure;

[0021] Figure 5 This is a schematic diagram of the support frame for the device of the present invention;

[0022] Figure 6 This is a schematic diagram of the flexible pressure plate structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the U-shaped sealing plate structure of the present invention;

[0024] Figure 8 This is a schematic diagram of the n-shaped sealing plate structure of the present invention;

[0025] Figure 9 This is another structural schematic diagram of the device of the present invention. Detailed Implementation

[0026] The present invention will now be described in further detail.

[0027] like Figure 1 , Figure 2a , Figure 2b , Figure 3-8 As shown, the device of the present invention includes a sealing element 11 and an air supply device. The sealing element 11 includes an n-shaped sealing plate 1, a U-shaped sealing plate 2, a flexible pressure plate 3, and a support 4. The support 4 and the U-shaped sealing plate 2 are respectively fixed to adjacent column units 5 and 6. The openings of the n-shaped sealing plate 1 and the U-shaped sealing plate 2 face each other. One end of the n-shaped sealing plate 1 extends into the support 4 and is detachably fixed to the side wall of the support 4 adjacent to the U-shaped sealing plate 2, while the other end extends into the bottom of the U-shaped sealing plate 2 to form a labyrinth seal. The upper end of the n-shaped sealing plate 1 is in loose contact with the upper end of the U-shaped sealing plate 2, and the lower end of the n-shaped sealing plate 1 forms a labyrinth with the U-shaped sealing plate 2. A flexible pressure plate 3 is provided between one end of the n-shaped sealing plate 1, which extends into the bracket 4, and the upper end of the U-shaped sealing plate 2, which is close to the bracket 4. In this embodiment, one end of the flexible pressure plate 3 is also fixed to the side wall of the bracket 4 adjacent to the U-shaped sealing plate 2, and the other end is pressed against the U-shaped sealing plate 2 by elastic force. In this way, a seal is formed between the tops of the n-shaped sealing plate 1 and the U-shaped sealing plate 2, preventing material entering the labyrinth seal from falling into the gap of the column unit. The top of the n-shaped sealing plate 1 is provided with an extension 7 for covering the top of the U-shaped sealing plate 2. A barrier plate 8 for sealing is detachably fixed between the extension 7 and the top of the U-shaped sealing plate 2. An air duct 9 is formed between the n-shaped sealing plate 1, the U-shaped sealing plate 2, the flexible pressure plate 3, and the barrier plate 8. The air supply device includes a blower 10. One end of each row of units is connected to the blower 10's outlet pipe at the head end, and the other end at the tail end is open. The blower 10 supplies air into each air duct 9, blowing out the material entering the duct. The blower 10 also delivers high-pressure gas into the air duct 9. Some material enters the air duct 9, and the high-pressure gas flow within the duct 9 effectively carries away the incoming material, ensuring a reliable seal. The device also includes a sealed air chamber 17 for sealing the head of each row of units. One end of each air duct 9 extends into the sealed air chamber 17, and the blower 10's outlet pipe delivers air through the sealed air chamber 17 to each air duct 9, exiting from the other end of the air duct 9. The other end of the air duct is open above the discharge section, allowing the blown material to fall directly into the discharge section.

[0028] Specifically, such as Figure 2bAs shown, the sealed air chamber 17 includes an upper housing 15 located above the sealing element at the head of each row unit. A fixing plate 16 is provided between the upper housing 15 and the sealing element 11. A lower housing 13 and a side partition 14 are provided below the upper housing 15. A lower partition 12 is provided at the bottom of each row unit. The upper housing 15, fixing plate 16, lower housing 13, lower partition 12, and side partition 14 form a sealed air chamber 17. In this invention, the bottom of the head row unit is isolated from the housing head by the lower partition and lower housing of the row unit and the side partition 14 of the row unit. The upper part of the row sealing element is isolated by the upper housing 15 and fixing plate 16. The sealed air chamber 17 is formed by isolating the row sealing head through the bottom and upper isolation.

[0029] The air duct extends into the enclosed air chamber 17 along with the column unit, such as... Figure 2a As shown, a fan 10 is connected to the sealed air chamber 17 to supply air to the sealed air chamber 17. After the fan 10 starts, high-pressure air is blown into the sealed air chamber 17 and then blown out along the air duct 9. The tail of the sealing element is located at the discharge port. Finally, the high-pressure air is blown directly to the discharge port along the air duct. If powder 19 enters the air duct 9, the powder 19 will be transported to the discharge port along with the high-pressure air. In this embodiment, there are 5 sealing elements, each of the same length, which can be 10 meters or 20 meters. All 5 sealing elements are inserted into the sealed air chamber 17 and require air supply from the head sealed air chamber. The 5 air ducts are independent and do not interfere with each other. If one air duct has a problem, the other air ducts will not be affected. The tail is located at the last section of the equipment where the material is discharged. In this embodiment, the device directly discharges air without a separate air outlet pipe.

[0030] In this embodiment, the bottom of the U-shaped sealing plate 2 is provided with a two-step structure; one end of the n-shaped sealing plate 1 extends into the U-shaped sealing plate 2 and is located on the higher step, dividing the U-shaped sealing plate 2 into two cavities; the air duct 9 is the cavity corresponding to the lower step. Figure 1 This is a schematic diagram of the structure of the elevated step near the support 4. The device of the present invention can also be configured such that the elevated step is located away from the support 4, for example... Figure 9 As shown.

[0031] The left and right gaps of the seals are not less than the left and right movement distance of the column units, ensuring smooth operation between columns. When material accumulates above the column units, the fit between the n-shaped sealing plate 1 and the U-shaped sealing plate 2 is only 0-1mm, and the air duct 9 is filled with high-pressure gas, effectively preventing material from entering the cavity. Simultaneously, the material on the column units also provides a sealing effect on the air duct 9.

[0032] The flexible pressure plate 3 in this embodiment includes an upper pressure plate 3-1 that is tightly attached to the top of the U-shaped sealing plate, and an elastic plate 3-2 that is tightly attached to the lower part of the pressure plate 3-1 and installed on the inner wall of the bracket. One end of the elastic plate 3-2 is connected to the bracket, so that the bottom of the pressure plate 3-1 is tightly attached to the top of one side of the U-shaped sealing plate. The pressure plate 3-1 is made of highly wear-resistant material and has a long service life. The elastic plate 3-2 is made of elastic material. The flexible pressure plate 3 is pressed against the U-shaped sealing plate 2 by a slight elastic force, which can effectively compensate for deformation and wear. At the same time, the flexible pressure plate 3 and the U-shaped sealing plate 2 have a gapless fit, which can effectively prevent material from leaking to the bottom equipment if the material reaches this point. The barrier plate in this embodiment is a detachable wear-resistant plate made of highly wear-resistant material, which can effectively prevent wear of the U-shaped sealing plate 2, and is easy to replace, only the barrier plate needs to be replaced, saving operating costs. The mating surface of the N-shaped sealing plate 1 and the U-shaped sealing plate 2 in this embodiment, i.e., the barrier plate, is treated with surface carburizing to improve wear resistance. Ribs are evenly arranged on the top of the n-shaped sealing plate 1, and grooves are formed between the ribs, which can effectively store a certain amount of material. This material is relatively stationary with the n-shaped sealing plate 1, which can effectively protect the top of the n-shaped sealing plate 1 from direct erosion by other materials, effectively reduce wear and tear on the material, and maximize service life.

[0033] In the sealing device of this invention, when the rows move relative to each other, the material is blocked by the mating structure formed between the extension 7 of the n-shaped sealing plate 1 and the top of the U-shaped sealing plate 2, i.e., blocked by the barrier plate, forming the first sealing line. Simultaneously, the air duct 9 formed between the n-shaped sealing plate 1, the U-shaped sealing plate 2, the flexible pressure plate 3, and the barrier plate is filled with high-pressure gas, effectively preventing material from passing through the first seal. When, due to special reasons, material in a certain part breaks through the first line of defense formed by the n-shaped sealing plate 1 and the U-shaped sealing plate 2, the high-velocity gas in the air duct can effectively sweep away the material entering the air duct 9 formed by the n-shaped sealing plate 1, the U-shaped sealing plate 2, and the flexible pressure plate 3, preventing material accumulation and achieving an effective sealing effect; this is the second sealing line. When the head fan malfunctions, or for other reasons, material cannot be transported in time in the air duct, causing material accumulation, the lower part of the n-shaped sealing plate 1 and the U-shaped sealing plate 2 forms a third line of defense, acting as a labyrinth seal to prevent material from entering. If some material enters the subsequent narrow space, the lack of gap between the flexible pressure plate 3 and the U-shaped sealing plate 2 will prevent the material from entering the lower equipment; this is the fourth line of defense.

[0034] During the manufacturing and installation of the seal, the sealing plane cannot be theoretically perfectly parallel. Furthermore, due to manufacturing errors, the column units are not ideally planar. Therefore, during seal assembly, the surfaces within the labyrinth may exhibit wavy or sawtooth shapes. The seal is also subject to accumulated errors along its length, severely limiting installation and use. Additionally, the column units cannot operate in a perfectly straight line; they will exhibit slight lateral swaying. If the labyrinth gap is too small, jamming or material entry may occur, increasing resistance between column units, leading to column unit malfunction, increased overall energy consumption, and reduced equipment lifespan. Conversely, if the labyrinth gap is too large, the sealing effect will be weakened. Therefore, to ensure stable operation of the column units, the left and right sealing gaps need to compensate for deviations caused by column movement, preventing jamming. To ensure sealing performance, materials entering the gaps need to be promptly conveyed. Therefore, the sealing device of this invention incorporates pneumatic conveying, which is beneficial for improving the stability and reliability of the seal.

Claims

1. A linear labyrinth / pneumatic conveying combined sealing device for train-type conveying, characterized in that, The system includes a seal (11) and an air supply device for supplying air into the seal (11). The seal (11) includes a bracket (4) fixed to adjacent column units and a U-shaped sealing plate (2). One end of an n-shaped sealing plate (1) opposite to the opening of the U-shaped sealing plate is detachably fixed to the bracket (4), and the other end extends into the bottom of the U-shaped sealing plate (2). The top of the n-shaped sealing plate (1) is provided with an extension (7) for covering the top of the U-shaped sealing plate (2). A barrier plate for sealing is detachably fixed between the extension (7) and the top of the U-shaped sealing plate (2). (8); A flexible pressure plate (3) for sealing is provided between one end of the n-shaped sealing plate (1) fixed on the bracket (4) and the top of the adjacent u-shaped sealing plate (2); an air duct (9) is formed between the n-shaped sealing plate (1), the u-shaped sealing plate (2), the flexible pressure plate (3) and the barrier plate (8); the air supply device includes a fan (10), one end of the air duct (9) located at the head of each row unit is connected to the air outlet pipe of the fan (10), and the other end located at the tail of each row unit is an open structure. The fan (10) blows air into each air duct (9) to blow out the material that enters the air duct.

2. Linear labyrinth / pneumatic conveying combined sealing device for columnar conveying according to claim 1, characterized in that It also includes a sealed air chamber (17) for sealing the head of each column unit. One end of each air duct (9) is inserted into the sealed air chamber (17). The air outlet pipe of the fan (10) sends air into each air duct (9) through the sealed air chamber (17) and out from the other end of the air duct.

3. Linear labyrinth / pneumatic combination sealing device for columnar transport according to claim 1, characterized in that The other end of the air duct (9) is open above the feeding section, so that the blown material falls into the feeding section.

4. The linear labyrinth / pneumatic conveyance combined sealing device for columnar conveyance according to claim 2, characterized by, The sealed air chamber (17) includes an upper shell (15) located above the seal (11) at the head of each row unit. A fixing plate (16) is provided between the upper shell (15) and the seal (11). A lower shell (13) and a side partition (14) are provided below the upper shell (15). A lower partition (12) is provided at the bottom of each row unit. The upper shell (15), fixing plate (16), lower shell (13), lower partition (12), and side partition (14) form a sealed air chamber (17).

5. Linear labyrinth / pneumatic combination sealing device for columnar transport according to claim 4, characterized in that The air outlet pipe of the fan (10) passes through the lower housing (13) and connects to the sealed air chamber (17).

6. The linear labyrinth / pneumatic conveyance combined sealing device for columnar conveyance according to claim 1, characterized by, The bottom of the U-shaped sealing plate (2) is provided with a stepped structure; one end of the n-shaped sealing plate (1) extends into the U-shaped sealing plate (2) and is located on the step at the higher position, dividing the U-shaped sealing plate (2) into two cavities; the air duct (9) is the cavity corresponding to the step at the lower position.

7. The linear labyrinth / pneumatic conveyance combined sealing device for columnar conveyance according to claim 1, characterized by, The top of the n-shaped sealing plate (1) is in a loose contact with the top of the u-shaped sealing plate (2). One end of the flexible pressure plate (3) and one end of the n-shaped sealing plate (1) are fixed to the side wall of the bracket (4) adjacent to the u-shaped sealing plate (2). The other end of the flexible pressure plate (3) is pressed against the upper end of the u-shaped sealing plate (2) by elastic force.

8. The linear labyrinth / pneumatic conveying combined sealing device for train-type conveying according to claim 1, characterized in that, The flexible pressure plate (3) includes an upper pressure plate (3-1) that is close to the top of the U-shaped sealing plate (2) and an elastic plate (3-2) that is close to the lower part of the pressure plate (3-1) and installed on the inner wall of the bracket (4); one end of the elastic plate (3-2) is connected to the bracket (4) so ​​that the bottom of the pressure plate (3-1) is close to the top of one side of the U-shaped sealing plate (2).

9. The linear labyrinth / pneumatic conveying combined sealing device for train-type conveying according to claim 8, characterized in that, The pressure plate (3-1) is made of a highly wear-resistant material; the elastic plate (3-2) is made of an elastic material that can compensate for the deformation between the flexible pressure plate (3) and the U-shaped sealing plate (2).

10. The linear labyrinth / pneumatic conveyance combined sealing device for columnar conveyance according to claim 1, characterized by, The U-shaped sealing plate (2) is connected to the side of the column unit.

Images