Double-plate valve device for preheater discharging pipe and using method of double-plate valve device
By designing an interconnected valve plate and cleaning plate structure, combined with airflow guidance through guide holes, the problem of scale buildup on the preheater feed pipe was solved, achieving automated cleaning and anti-adhesion, reducing operation and maintenance costs and unplanned downtime, and ensuring production stability.
Patent Information
- Application Number
- CN202610309339.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-13
- Publication Date
- 2026-05-08
AI Technical Summary
The existing double-plate valve of the preheater feed pipe is prone to forming a crust in high-temperature environments, which leads to inaccurate material flow regulation and frequent blockages. Traditional unblocking methods are labor-intensive, have high safety risks, and affect production stability and maintenance costs.
A dual-plate valve device was designed, comprising a valve plate and a cleaning plate. Through a linkage structure and flow guide hole design, it achieves automatic cleaning of crusts and prevents material adhesion. Airflow guidance reduces crust formation, and regular maintenance ensures stable operation of the device.
It achieves automated cleaning of crusts, reduces operation and maintenance costs, reduces unplanned downtime, ensures production continuity and safety, and reduces the probability of repeated crust formation.
Smart Images
Figure CN121993610A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of engineering components technology, specifically relating to valves, and more particularly to a double-plate valve device for a preheater feed pipe and its usage method. Background Technology
[0002] In cement production processes, the preheater feed pipe is a crucial channel connecting various stages of the cyclone separator to the preheater or rotary kiln. The smooth flow of materials within it directly impacts the thermal efficiency and operational stability of the entire production line. The double-plate valve, as the core control component of the feed pipe, primarily regulates material flow and ensures system sealing through the opening and closing of the valve plate, guaranteeing the negative pressure environment and heat exchange efficiency of the preheater system.
[0003] However, in actual production, the high-temperature working environment of the inner wall of the double plate valve leads to a prominent skinning problem. That is, the internal temperature of the preheater is usually in the range of 300-850℃. The organic components in the substitute raw materials decompose and burn at high temperatures, and the resulting molten ash, alkali metal salts and unburned residual carbon are very easy to adhere and deposit on the side wall of the double plate valve (the back of the adjacent valve plate), forming a hard and dense skin.
[0004] As the crust thickness increases, the effective opening and closing space of the valve plate is compressed, resulting in insufficient swing angle and inability to accurately regulate the material flow. When the crust thickness reaches the critical value, the valve plate will be completely stuck, causing blockage of the feed pipe and forcing the production line to stop for maintenance.
[0005] Traditional double-plate valve structures only focus on the wear resistance and sealing performance of the valve plate itself, without optimizing the design for cleaning and preventing blockages after scale formation. Conventional cleaning methods, such as manual tapping and high-pressure air purging, are not only labor-intensive and pose high safety risks, but also have limited cleaning effects and cannot fundamentally solve the problem of repeated scale formation.
[0006] The aforementioned problems lead to increased unplanned downtime of cement plant preheater systems, significantly increased maintenance costs, and also restrict the large-scale application of alternative raw materials, becoming a technical bottleneck in the cement industry's green and low-carbon transformation. Therefore, there is an urgent need to develop a double-plate valve device for the preheater feed pipe that can effectively prevent crust formation and quickly clear blockages after crust formation, as well as its application method, which are technical problems that urgently need to be solved in this field.
[0007] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Summary of the Invention
[0008] This disclosure provides at least one embodiment of a double-plate valve device for a preheater feed pipe and its usage method.
[0009] In a first aspect, embodiments of this disclosure provide a double-plate valve device for a preheater feed pipe, comprising: The valve body, valve plate, and cleaning plate, wherein the valve body has an annular sidewall defining a material passage; The two valve plates are rotatably disposed within the material channel to control the flow and interruption of the material. The cleaning plate is slidably disposed on the inner wall of the valve body on the side located on the back of the valve plate, and is linked with the valve plate; The cleaning plate is provided with a guide hole, one end of which extends axially along the valve body and the other end extends radially along the valve body. When the valve plate is opened, it pushes the cleaning plate downward to clean the crust on the annular sidewall; The airflow flowing upward from the bottom of the valve body passes through the guide hole, which changes the direction of the airflow so that the material gathers and falls towards the axis of the valve body.
[0010] In one optional embodiment, a compression spring is provided on the annular sidewall near the cleaning plate, the upper end of the compression spring abutting against the inner sidewall of the cleaning plate, and the compression spring is used to push the cleaning plate to slide and reset in an inclined upward direction.
[0011] In one optional embodiment, the upper edge of the cleaning plate is provided with a rounded chamfer. When the valve plate flips in the opening direction, it abuts against the rounded chamfer and is pushed to continue sliding downward by the guiding effect of the rounded chamfer.
[0012] In one optional embodiment, the surface of the cleaning plate is provided with a wear-resistant and high-temperature resistant coating, the material of which is selected from tungsten carbide, chromium oxide or silicon nitride ceramic.
[0013] In one optional embodiment, a spring mounting groove is provided on the annular sidewall, the lower end of the compression spring is embedded and fixed in the spring mounting groove, and the upper end of the compression spring elastically abuts against the bottom of the cleaning plate.
[0014] In one optional embodiment, the guide holes are arranged in an array on the cleaning plate, and the radial section of each guide hole faces the axial direction of the valve body.
[0015] In one alternative embodiment, the outer wall of the cleaning plate is in contact with the inner wall of the annular sidewall, and the sliding stroke of the cleaning plate is adapted to the maximum opening and closing angle of the valve plate.
[0016] In one optional embodiment, the valve plate has a boss on its back, which abuts against the cleaning plate, and the cleaning plate is pushed to slide by the boss when the valve plate rotates.
[0017] In one optional embodiment, the valve body has an annular sidewall that encloses a vertical material channel, and the inner side of the annular sidewall is provided with a guide structure for the cleaning plate to slide. Two symmetrically arranged valve plates are connected to the valve body by a pivot, and the opening and closing directions of the two valve plates are adapted to the on / off control requirements of the material channel. The cleaning plate is slidably engaged with the guide structure, and the cleaning plate abuts against the back of the valve plate to form a linkage engagement. When the valve plate rotates in the opening direction, it can push the cleaning plate to slide downward along the annular sidewall. The cleaning plate has a through-hole. The axial section of the through-hole extends along the vertical axis of the valve body, and the radial section extends along the horizontal radial direction of the valve body. The axial section and the radial section are connected. The rising airflow at the bottom of the valve body enters through the axial section, flows out through the radial section, and then disperses towards the axis of the valve body to drive the material to gather and fall towards the axis.
[0018] Secondly, this disclosure also provides a method of using a double-plate valve device for a preheater feed pipe, the method comprising: S1. Equipment debugging: After assembling the double plate valve device with the preheater feed pipe, debug the rotation flexibility of the valve plate and the sliding fit of the cleaning plate to ensure that the compression spring can push the cleaning plate to return to its normal position. S2. Normal feeding: According to the material conveying requirements of the preheater, control the opening and closing angle of the valve plate. During the opening process of the valve plate, push the cleaning plate to slide downward to scrape off the scale on the annular side wall of the valve body. During the closing process of the valve plate, the compression spring pushes the cleaning plate to slide upward and reset, completing one scale cleaning action. S3. Airflow guidance: During the feeding process, the airflow at the bottom of the valve body is reversed by the guide hole, so that the airflow carries the material to gather and fall towards the center of the valve body, reducing the contact area between the material and the annular sidewall, and reducing the probability of material adhesion and crusting on the annular sidewall from the source. S4. Regular maintenance: Regularly check the wear-resistant and high-temperature resistant coating of the cleaning plate and the unobstructed flow holes. Repair or replace cleaning plates with damaged coatings and unclog blocked flow holes.
[0019] In one optional implementation, in step S2, the opening and closing operation of the valve plate is controlled intermittently. Each time the valve plate rotates from closed to the maximum opening angle, it drives the cleaning plate to complete a complete downward scraping action.
[0020] The beneficial effects of this invention are as follows: This invention provides a double-plate valve device for preheater feed pipes and its usage method. Through the designed valve plate linkage cleaning plate structure and the airflow guidance design of the guide holes, it achieves the dual technical effects of active scale removal and material anti-adhesion. Compared with traditional double-plate valves and unblocking methods, it automates scale removal and reduces maintenance costs: the cleaning plate is linked to the valve plate, and the scale on the annular sidewall can be scraped off during the normal opening and closing of the valve plate, eliminating the need for manual knocking, high-pressure purging, and other additional unblocking operations. This completely solves the problems of high labor intensity and high safety risks associated with traditional unblocking methods, significantly reducing unplanned downtime of the preheater system and lowering equipment maintenance costs. The guide holes on the cleaning plate redirect the rising airflow at the bottom of the valve body to airflow towards the axis, causing the material to gather and fall towards the axis of the valve body, significantly reducing the contact area between the material and the annular sidewall. This fundamentally reduces the probability of molten ash, alkali metal salts, etc., adhering to the sidewall, preventing repeated scale formation, and ensuring the long-term stable operation of the double-plate valve.
[0021] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.
[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies 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 from these drawings without creative effort.
[0024] Figure 1 A perspective view of a double-plate valve device for a preheater feed pipe provided in an embodiment of this disclosure; Figure 2 This is a sectional perspective view of the valve body provided in an embodiment of the present disclosure; Figure 3 This is a schematic diagram showing the valve plate pushing the cleaning plate downwards in an embodiment of the present disclosure. Figure 4 This is a schematic diagram of the valve body in a closed valve state provided in an embodiment of this disclosure.
[0025] In the picture: 1. Valve body; 10. Annular sidewall; 11. Compression spring; 2. Valve plate; 21. Boss; 3. Cleaning plate; 30. Drainage hole; 31. Rounded chamfer. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0027] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.
[0028] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify an entire column of elements when following a column of elements. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0029] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.
[0030] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0031] Research has revealed that in cement production processes, the preheater feed pipe is a crucial channel connecting various stages of the cyclone separator to the decomposition furnace or rotary kiln. The smooth flow of materials within it directly impacts the thermal efficiency and operational stability of the entire production line. The double-plate valve, as the core control component of the feed pipe, primarily regulates material flow and ensures system sealing through the opening and closing of the valve plate, guaranteeing the negative pressure environment and heat exchange efficiency of the preheater system.
[0032] However, in actual production, the high-temperature working environment of the inner wall of the double plate valve leads to a prominent skinning problem. That is, the internal temperature of the preheater is usually in the range of 300-850℃. The organic components in the substitute raw materials decompose and burn at high temperatures, and the resulting molten ash, alkali metal salts and unburned residual carbon are very easy to adhere and deposit on the side wall of the double plate valve (the back of the adjacent valve plate), forming a hard and dense skin.
[0033] As the crust thickness increases, the effective opening and closing space of the valve plate is compressed, resulting in insufficient swing angle and inability to accurately regulate the material flow. When the crust thickness reaches the critical value, the valve plate will be completely stuck, causing blockage of the feed pipe and forcing the production line to stop for maintenance.
[0034] Traditional double-plate valve structures only focus on the wear resistance and sealing performance of the valve plate itself, without optimizing the design for cleaning and preventing blockages after scale formation. Conventional cleaning methods, such as manual tapping and high-pressure air purging, are not only labor-intensive and pose high safety risks, but also have limited cleaning effects and cannot fundamentally solve the problem of repeated scale formation.
[0035] The aforementioned problems lead to increased unplanned downtime of cement plant preheater systems, significantly increased maintenance costs, and also restrict the large-scale application of alternative raw materials, becoming a technical bottleneck in the cement industry's green and low-carbon transformation. Therefore, there is an urgent need to develop a double-plate valve device for the preheater feed pipe that can effectively prevent crust formation and quickly clear blockages after crust formation, as well as its application method, which are technical problems that urgently need to be solved in this field.
[0036] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.
[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0038] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0039] like Figures 1 to 4 As shown, at least one embodiment provides a double-plate valve device for a preheater feed pipe, comprising: a valve body 1, two symmetrically arranged valve plates 2, and a cleaning plate 3. The annular sidewall 10 of the valve body 1 forms a vertical material channel, which is coaxially connected to the material flow path of the preheater feed pipe. The valve plates 2 are rotatably disposed within the material channel to control the flow and interruption of the material. Preferably, a plurality of connecting rods are symmetrically arranged on the outer wall of the valve body 1, and the outer ends of the connecting rods are connected to a driving device to drive the valve plates 2 to open or close. The cleaning plate 3 is slidably disposed on the inner wall of the valve body 1 on the side located on the back of the valve plates 2, and is linked with the valve plates 2. At the same time, the cleaning plate 3 has a guide hole 30 to realize airflow reversal and material guidance. The specific structure and connection relationship of each component are as follows: like Figure 2 The valve body 1 is made of high-temperature resistant cast steel and its upper end is sealed to the preheater feed pipe. The inner wall of the annular sidewall 10 of the valve body 1 is a smooth slope to reduce the basic adhesion points of the material. A spring mounting groove is provided on the annular sidewall 10 near the cleaning plate 3 to fix the compression spring 11. A vertical sliding groove (guide fit structure) is provided on the inner side of the annular sidewall 10. The extension direction of the sliding groove is consistent with the material falling direction. The length of the sliding groove is adapted to the maximum opening and closing angle of the valve plate 2 to provide sliding guidance for the cleaning plate 3. Pivot mounting seats are provided on both sides of the valve body 1 to realize the rotational connection of the valve plate 2.
[0040] Valve plates 2, two valve plates 2 are symmetrically arranged in the material channel, and are rotatably connected to the pivot mounting seat of the valve body 1 via a pivot. The rotation opening and closing direction of the valve plates 2 is adapted to the on / off control requirements of the material channel, that is, the two valve plates 2 rotate outward synchronously to the open state and rotate inward to the closed state. The valve plates 2 are made of wear-resistant and heat-resistant alloy material, and their edges are embedded with elastic seals. When closed, the elastic seals are tightly fitted with the inner sidewall of the annular sidewall 10 to achieve sealing of the material channel and ensure the negative pressure environment of the preheater. The back of the valve plate 2 is integrally formed with a boss 21, which is suitable for abutting against the inner sidewall of the cleaning plate 3, serving as the linkage force point between the valve plate 2 and the cleaning plate 3, and avoiding hard contact damage between the valve plate 2 and the cleaning plate 3 when rotating.
[0041] The cleaning plate 3 is made of high-temperature resistant cast steel that matches the valve body 1. Its outer wall is an inclined surface that matches the annular sidewall 10. Its outer sidewall is in close contact with the inner sidewall of the annular sidewall 10. The edge of the cleaning plate 3 is provided with a slider that slides in cooperation with the vertical groove of the valve body 1, so that the cleaning plate 3 can slide vertically along the annular sidewall 10. The sliding stroke of the cleaning plate 3 is adapted to the maximum opening angle of the valve plate 2, so that when the valve plate 2 is opened to the maximum angle, the cleaning plate 3 can slide to the lower area of the annular sidewall 10 to complete the full stroke scraping. The upper edge of the cleaning plate 3 is provided with a rounded chamfer to cooperate with the boss 21 of the valve plate 2 to achieve guiding and pushing. The cleaning plate 3 is provided with an array of guide holes 30, and the surface of the cleaning plate 3 is sprayed with a wear-resistant and high-temperature resistant coating. The coating material is tungsten carbide (chromium oxide or silicon nitride ceramic can also be selected according to the working conditions). The coating thickness is 0.5-1mm, which improves the wear resistance and temperature resistance of the cleaning plate 3 and is suitable for the high-temperature wear conditions of the preheater.
[0042] The compression spring 11 is made of high-temperature resistant alloy spring steel. Its lower end is embedded in the spring mounting groove of the annular side wall 10 of the valve body 1, and its upper end is elastically abutting against the inner side wall of the cleaning plate 3. The elastic force of the compression spring 11 is designed according to the weight and sliding resistance of the cleaning plate 3 to ensure that it can push the cleaning plate 3 to slide and reset in an upward direction, and will not affect the normal pushing of the valve plate 2 due to excessive elastic force.
[0043] Guide hole 30: The guide hole 30 is an irregularly shaped hole that penetrates the cleaning plate 3. One end extends along the axial direction (vertical direction) of the valve body 1 to form an axial section, and the other end extends along the radial direction (horizontal direction) of the valve body 1 to form a radial section. The axial section and the radial section are smoothly connected without sharp corners or dead angles, so as to avoid material from adhering and clogging in the guide hole 30. The guide holes 30 are arranged in a matrix array on the cleaning plate 3. The radial section of each guide hole 30 faces the axial direction of the valve body 1, ensuring that the rising airflow at the bottom of the valve body 1 is diverted by the guide hole 30 and disperses towards the axial direction of the valve body 1.
[0044] like Figure 3The valve plate 2 and the cleaning plate 3 work together. When the valve plate 2 rotates in the opening direction (outward), the boss 21 on its back first abuts against the rounded chamfer at the upper end of the cleaning plate 3. Through the guiding effect of the rounded chamfer, the rotational force of the boss 21 is converted into an axial force that pushes the cleaning plate 3 to slide downward, causing the cleaning plate 3 to slide downward along the vertical groove of the valve body 1. The outer wall of the cleaning plate 3 scrapes off the crust adhering to the annular sidewall 10. When the valve plate 2 rotates in the closing direction (inward), the abutting force between the boss 21 and the cleaning plate 3 disappears, and the elastic restoring force of the compression spring 11 pushes the cleaning plate 3 to slide upward along the vertical groove to reset, preparing for the next unblocking action.
[0045] Continue to refer to the appendix Figure 3 With the airflow guidance of the guide hole 30, when the cement preheater feed pipe is working, a high-temperature airflow (F1) will be generated at the bottom of the valve body 1. This airflow enters from the axial section of the guide hole 30 of the cleaning plate 3, and after being reversed by the radial section, it disperses towards the axial direction of the valve body 1, forming a centripetal airflow. This centripetal airflow intersects with the material falling direction (F2), causing the material to gather and fall towards the axial direction of the valve body 1, greatly reducing the contact area between the material and the annular sidewall 10, and reducing the probability of material adhesion and crusting from the source.
[0046] The sliding guide and reset mechanism are coordinated. The slider of the cleaning plate 3 and the vertical groove of the valve body 1 are in clearance fit, with the clearance controlled at 0.1-0.2mm. This ensures the smooth sliding of the cleaning plate 3 and prevents the material from entering the groove and causing blockage due to excessive clearance. The compression spring 11 elastically abuts against the bottom of the cleaning plate 3, and the cleaning plate 3 is inclined. The pushing force of the compression spring 11 makes the cleaning plate 3 always have an upward reset tendency, ensuring that the cleaning plate 3 can quickly reset to the initial position after the valve plate 2 is closed.
[0047] At least one embodiment provides a double-plate valve device for a preheater feed pipe, comprising: A valve body 1 has an annular sidewall 10 that encloses a vertical material channel. The inner side of the annular sidewall 10 is provided with a guide structure for the sliding of a cleaning plate 3. Preferably, the guide structure includes a spring mounting groove near the cleaning plate 3 on the annular sidewall 10 for fixing a compression spring 11. The upper end of the compression spring 11 is grounded to the inner wall of the cleaning plate 3 to push the cleaning plate 3 upwards for reset. Further, the guide structure also includes a sliding groove on the inner sidewall of the cleaning plate 3 and a slider on the annular sidewall 10; the cooperation between the slider and the groove ensures the stability of the cleaning plate 3 sliding along the annular sidewall 10. Two symmetrically arranged valve plates 2 are pivotally connected to the valve body 1, and the opening and closing directions of the two valve plates 2 are adapted to the on / off control requirements of the material channel. The cleaning plate 3 is slidably engaged with the guide structure, and the cleaning plate 3 abuts against the back of the valve plate 2 to form a linkage engagement. When the valve plate 2 rotates in the opening direction, it can push the cleaning plate 3 to slide downward along the annular sidewall 10. The cleaning plate 3 has a through-hole 30. The axial section of the through-hole 30 extends along the vertical axis of the valve body 1, and the radial section extends along the horizontal radial direction of the valve body 1. The axial section and the radial section are connected. The rising airflow at the bottom of the valve body 1 enters through the axial section, flows out through the radial section, and then disperses towards the axis of the valve body 1 to drive the material to gather and fall towards the axis.
[0048] At least one embodiment provides a method for using a double-plate valve device for a preheater feed pipe. Based on the aforementioned device structure, it integrates four major steps: device commissioning, normal feeding, airflow guidance, and regular maintenance. This achieves the dual effects of scale removal and scale prevention, while ensuring the continuity of the cement production process. The specific steps are as follows: Step S1: Device commissioning. Assemble the double-plate valve device coaxially with the preheater feed pipe via the flange at the preset position, ensuring complete connection between the material channel of valve body 1 and the material flow path of the feed pipe. After assembly, perform commissioning. Manually rotate both valve plates 2 to check their rotation flexibility, ensuring that they can rotate smoothly within the range of 0-90° without any jamming. Observe the linkage between valve plate 2 and cleaning plate 3 during the rotation process to ensure that when valve plate 2 is open, it can push cleaning plate 3 to slide smoothly downwards, and when closed, compression spring 11 can push cleaning plate 3 to return to normal upwards. The slider of cleaning plate 3 slides in the vertical groove without jamming. Check the unobstructed flow of the guide hole 30 to ensure that there is no blockage such as pouring residue or foreign matter. At the same time, check that the wear-resistant and high-temperature resistant coating of the cleaning plate 3 is free from peeling or damage. Close valve plate 2 and check the fit between the elastic seal at the edge of valve plate 2 and the inner wall of the annular sidewall 10 to ensure a tight seal and maintain a negative pressure environment for the preheater.
[0049] Step S2: Normal material feeding. According to the material conveying process requirements of the cement preheater, the opening and closing angle of valve plate 2 is controlled by the drive mechanism (hydraulic drive or electric drive) to achieve precise adjustment of material flow and complete automatic cleaning of crusts. The control valve plate 2 rotates outward synchronously. The opening and closing angle of the valve plate 2 is adjusted according to the material flow requirements (0-90°). When the valve plate 2 rotates, the boss 21 on the back abuts against the rounded chamfer of the cleaning plate 3, pushing the cleaning plate 3 to slide downward along the annular sidewall 10. The outer sidewall of the cleaning plate 3 scrapes off the molten ash, alkali metal salts and other crusts adhering to the annular sidewall 10 throughout the entire stroke. The scraped crusts fall down with the material and enter the subsequent process steps. When the material flow demand decreases, the control valve plate 2 rotates inward synchronously, the contact force between the boss 21 and the cleaning plate 3 disappears, the compression spring 11 pushes the cleaning plate 3 upward to slide back to its original position, and completes one crust cleaning action. The intermittent opening and closing control method is adopted. Even if the material flow rate remains constant, the valve plate 2 is controlled to complete the rotation process from closed to maximum opening angle every 30-60 minutes. This drives the cleaning plate 3 to complete a complete downward scraping action, avoiding the hardening of the thin skin into a hard and dense thick skin, and improving the unblocking effect.
[0050] Step S3: Airflow guidance. During the normal material feeding process, the airflow is reversed and the material is guided by the guide holes 30 on the cleaning plate 3, reducing the formation of crusts from the source. The high-temperature rising airflow (F1) at the bottom of valve body 1 flows from bottom to top, such as... Figure 3 The air enters through the axial section of the guide hole 30 of the cleaning plate 3, and after changing direction along the radial section, it disperses towards the axial direction of the valve body 1, forming a uniform centripetal airflow. The centripetal airflow converges with the material falling direction (F2), causing the material particles to gather towards the axis of valve body 1, making the material fall vertically along the axis, greatly reducing the contact area between the material and the annular sidewall 10, and preventing the material from adhering to the sidewall. The array arrangement of the guide holes 30 allows the centripetal airflow to cover the entire cross section of the material channel, ensuring that materials at different locations can be gathered by the centripetal airflow without any dead angles, thus completely solving the problem of skin formation on the annular sidewall 10 on the back of the valve plate 2.
[0051] Step S4: Regular maintenance. In conjunction with the equipment maintenance cycle in cement production, perform regular maintenance on the double-plate valve device to ensure its long-term stable operation. The maintenance cycle is 1-3 months. Specific maintenance details are as follows: Inspect the wear-resistant and high-temperature resistant coating on the surface of cleaning plate 3. If the coating peels off or is damaged, repair it in time using thermal spraying. If the damaged area exceeds 30%, replace cleaning plate 3. Check the unobstructed flow of the guide hole 30. If there is any material residue or crusting, use high-pressure air (0.6-0.8MPa) to clear it and ensure normal airflow reversal. Check the elastic performance of the compression spring 11. If the spring is loose, deformed, or broken, replace it with a high-temperature resistant compression spring 11 of the same specification in time to ensure that the cleaning plate 3 can be reset normally. Check the boss 21 of valve plate 2 and the chamfer of cleaning plate 3 for wear. If the wear is severe, repair it by welding to ensure the reliability of linkage. Check the clearance between the vertical slide groove of valve body 1 and the slider of cleaning plate 3. If the clearance is too large, replace the slider and clean the foreign objects in the slide groove to ensure smooth sliding. Inspect the elastic seals on the edge of valve plate 2. If they are aged or damaged, replace them promptly to ensure the sealing performance of the double-plate valve.
[0052] exist Figure 3 In the diagram, F1 represents the airflow flowing upward from the bottom of valve body 1, which changes its flow direction after passing through the guide hole 30; thus, it has the effect of gathering the material, so that the material can be more concentrated towards the axis of valve body 1 during the falling process; F2 represents the falling direction of the material inside valve body 1.
[0053] The scope of protection of this invention is not limited to the above embodiments. Without departing from the core technical concept of this invention, those skilled in the art can make various modifications: The material for the wear-resistant and high-temperature resistant coating can be selected according to the specific temperature conditions of the preheater. For example, silicon nitride ceramics can be used when the temperature is above 800℃, chromium oxide can be used when the temperature is 600-800℃, and tungsten carbide can be used when the temperature is 300-600℃. The arrangement of the guide holes 30 can be adjusted according to the diameter of the material channel. In addition to the matrix array, a ring array can also be used to ensure the uniformity of the centripetal airflow. In addition to the boss 21, the linkage between the valve plate 2 and the cleaning plate 3 can also be a linkage with a connecting rod to adapt to different specifications of double plate valve devices. In addition to the slide groove-slider, the guide fit structure can also adopt a slide rail-pulley structure to further reduce the sliding resistance of the cleaning plate 3. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
[0054] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.
[0055] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.
[0056] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A double-plate valve device for a preheater feed pipe, characterized in that, include: Valve body (1), valve plate (2) and cleaning plate (3), wherein the valve body (1) has an annular sidewall (10) defining a material passage; The two valve plates (2) are rotatably disposed in the material channel for controlling the flow and flow rate of the material; The cleaning plate (3) is slidably disposed on the inner wall of the valve body (1) on the side of the back of the valve plate (2) and is linked with the valve plate (2); The cleaning plate (3) is provided with a guide hole (30), one end of which extends axially along the valve body (1) and the other end extends radially along the valve body (1); When the valve plate (2) is opened, it pushes the cleaning plate (3) to slide downward to clean the crust on the annular sidewall (10); The airflow flowing upward from the bottom of the valve body (1) passes through the guide hole (30), and the guide hole (30) changes the direction of the airflow so that the material gathers and falls towards the axial direction of the valve body (1).
2. The double-plate valve device for the preheater feed pipe as described in claim 1, characterized in that, A compression spring (11) is provided on the annular sidewall (10) near the cleaning plate (3). The upper end of the compression spring (11) abuts against the inner sidewall of the cleaning plate (3). The compression spring (11) is used to push the cleaning plate (3) to slide and reset in an inclined upward direction.
3. The double-plate valve device for the preheater feed pipe as described in claim 1, characterized in that, The upper edge of the cleaning plate (3) is provided with a rounded chamfer (31). When the valve plate (2) flips in the opening direction, it abuts against the rounded chamfer (31) and pushes the cleaning plate (3) to continue sliding downward through the guiding effect of the rounded chamfer (31).
4. The double-plate valve device for the preheater feed pipe as described in claim 1, characterized in that, The surface of the cleaning plate (3) is provided with a wear-resistant and high-temperature resistant coating, and the material of the coating is selected from tungsten carbide, chromium oxide or silicon nitride ceramic.
5. The double-plate valve device for the preheater feed pipe as described in claim 2, characterized in that, A spring mounting groove is provided on the annular sidewall (10), and the lower end of the compression spring (11) is embedded and fixed in the spring mounting groove. The upper end of the compression spring (11) elastically abuts against the bottom of the cleaning plate (3).
6. The double-plate valve device for the preheater feed pipe as described in claim 1, characterized in that, The guide holes (30) are arranged in an array on the cleaning plate (3), and the radial section of each guide hole (30) is oriented toward the axis of the valve body (1).
7. The double-plate valve device for the preheater feed pipe as described in claim 1, characterized in that, The outer wall of the cleaning plate (3) is in contact with the inner wall of the annular sidewall (10), and the sliding stroke of the cleaning plate (3) is adapted to the maximum opening and closing angle of the valve plate (2).
8. The double-plate valve device for the preheater feed pipe as described in claim 1, characterized in that, The valve plate (2) has a boss (21) on its back. The boss (21) abuts against the cleaning plate (3). When the valve plate (2) rotates, it pushes the cleaning plate (3) to slide through the boss (21).
9. A double-plate valve device for a preheater feed pipe, characterized in that, include: The valve body (1) has an annular sidewall (10) that encloses a vertical material channel. The annular sidewall (10) has a guide structure on the inner side for the cleaning plate (3) to slide. Two symmetrically arranged valve plates (2) are connected to the valve body (1) by a pivot, and the opening and closing directions of the two valve plates (2) are adapted to the on / off control requirements of the material channel. The cleaning plate (3) is slidably fitted with the guide fitting structure, and the cleaning plate (3) abuts against the back of the valve plate (2) to form a linkage fit. When the valve plate (2) rotates in the opening direction, it can push the cleaning plate (3) to slide downward along the annular sidewall (10). The cleaning plate (3) has a through-hole (30). The axial section of the through-hole (30) extends along the vertical axis of the valve body (1), and the radial section extends along the horizontal radial direction of the valve body (1). The axial section and the radial section are connected. The rising airflow at the bottom of the valve body (1) enters through the axial section and flows out through the radial section and then disperses towards the axis of the valve body (1) to drive the material to gather and fall towards the axis.
10. A method of using a double-plate valve device for a preheater feed pipe, characterized in that, The method of using the double-plate valve device for the preheater feed pipe as described in any one of claims 1-9 includes: S1. Device debugging: After assembling the double plate valve device with the preheater feed pipe, debug the rotation flexibility of the valve plate (2) and the sliding fit of the cleaning plate (3) to ensure that the compression spring (11) can push the cleaning plate (3) to reset normally. S2. Normal feeding: According to the material conveying requirements of the preheater, control the opening and closing angle of the valve plate (2). During the opening process of the valve plate (2), push the cleaning plate (3) to slide downward to scrape off the crust on the annular side wall (10) of the valve body (1). During the closing process of the valve plate (2), the compression spring (11) pushes the cleaning plate (3) upward to slide back to reset, completing one crust cleaning action. S3. Airflow guidance: During the feeding process, the airflow at the bottom of the valve body (1) is reversed by the guide hole (30), so that the airflow carries the material to gather and fall towards the center of the valve body (1), reducing the contact area between the material and the annular sidewall (10), and reducing the probability of the material adhering and forming skin on the annular sidewall (10) from the source. S4. Regular maintenance: Regularly check the wear-resistant and high-temperature resistant coating of the cleaning plate (3) and the unobstructed flow holes (30), repair or replace the cleaning plate (3) with damaged coating, and unclog the blocked flow holes (30).
11. The method of using the anti-scabbing method of the double-plate valve device for the preheater feed pipe according to claim 10, characterized in that, In step S2, the opening and closing operation of the valve plate (2) is controlled intermittently. Each time the valve plate (2) rotates from closed to the maximum opening angle, it drives the cleaning plate (3) to complete a complete downward scraping action.