Sealing mechanism for rotary waste heat drying furnace

Abstract

The invention discloses a sealing mechanism for a rotary waste heat drying furnace, and relates to the field of waste heat drying furnace sealing, the sealing mechanism specifically comprises a furnace body and a sealing plate fixedly arranged on the outer wall of a furnace opening of the furnace body, a sealing assembly for sealing the furnace body is arranged on the outer side of the furnace body, and the sealing assembly comprises a sealing disc; two circular grooves are formed in the inner wall, close to the sealing plate, of the sealing disc, graphite disc heels making contact with the sealing plate are installed in the circular grooves, and packing pressing plates for pressing the graphite packing are further arranged in the circular grooves; the wear degree of the sealing material and the pressure intensity of the sealing area are monitored in real time through the sensor, the air cylinder and the air inlet connector are combined, wear of the sealing material and pressurization treatment of the sealing area are automatically compensated, a cooperative system of the sensor and the controller is established, the wear degree of the sealing material is monitored in real time, and sealing regulation and control optimization is conducted in time; and the sealing performance of the drying furnace is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing of waste heat drying furnaces, and more particularly to a sealing mechanism for a rotary waste heat drying furnace. Background Art

[0002] Rotary waste heat drying furnaces are widely used in industrial production to dry materials such as sludge and solid waste. The furnace body needs to maintain a high temperature environment (usually 200℃ to 600℃) during operation, accompanied by continuous turning of materials and gas circulation. The sealing performance of the furnace mouth directly affects the operating efficiency, energy consumption and safety of the equipment. However, current sealing technology still has the following shortcomings:

[0003] Traditional sealing mechanisms mostly use soft materials such as graphite packing and fiber packing, and achieve sealing through direct compression by pressure plates or springs. However, under the combined effects of high temperature, dust and mechanical friction, the sealing materials are prone to wear, aging or hardening, resulting in an increase in the sealing gap and leakage risk. It is impossible to monitor the degree of wear of the sealing material in real time and adjust the seal in time. For this reason, a solution is now provided. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a sealing mechanism for a rotary waste heat drying furnace.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a sealing mechanism for a rotary waste heat drying furnace, comprising a furnace body and a sealing plate fixedly arranged on the outer wall of the furnace mouth, a sealing assembly for sealing the furnace body being provided on the outer side of the furnace body, the sealing assembly comprising a sealing disk, two circular grooves being provided on the inner wall of the sealing disk near the sealing plate, graphite packings in contact with the sealing plate being installed in the circular grooves, a packing pressure plate for pressing the graphite packings being further provided in the circular grooves, and a laser displacement sensor being installed on the outer wall of the sealing plate;

[0006] A plurality of groups of cylinders for applying pressure to the packing pressure plate are vertically mounted on the outer walls of the sealing disk corresponding to the packing pressure plate, and the plurality of groups of cylinders are staggered.

[0007] Furthermore, an encrypted hollow wall is provided on the inner wall of the sealing disk located between the two groups of graphite packings, and a plurality of air inlet joints for pressurizing the encrypted hollow wall are fixedly inserted on the outer wall of the sealing disk corresponding to the encrypted hollow wall, and a piezoresistive sensor is embedded inside the encrypted hollow wall.

[0008] Furthermore, the piezoresistive sensor and the laser displacement sensor, together with a controller outside the rotary waste heat drying furnace, form a furnace mouth sealing monitoring system.

[0009] Furthermore, the laser displacement sensor is used to collect the wear amount ΔD of the graphite, and the wear amount ΔD is expressed as the real-time measurement distance D t Subtract the initial reference distance D0 and send the wear amount ΔD to the controller; the controller obtains the wear amount ΔD and compares it with the safety threshold ΔDmax in the controller database;

[0010] When the wear amount ΔD ≥ the safety threshold ΔDmax, it indicates that the wear amount of the graphite packing exceeds the safety threshold and a compensation sealing signal is generated. When the controller receives the compensation sealing signal, the controller controls the cylinder to extend a preset compensation stroke.

[0011] Furthermore, the initial reference distance D0 represents the initial distance measured by the laser displacement sensor when the graphite packing is not worn, and the real-time measurement distance Dt represents the real-time distance measured by the laser displacement sensor after the graphite packing is worn.

[0012] Furthermore, the piezoresistive sensor is used to collect the gas pressure value Po inside the encrypted empty wall and send the pressure value Po to the controller. When the controller obtains the pressure value PO, it immediately compares and analyzes it with the safety threshold value POt in the controller database. When the pressure value PO≤safety threshold value POt, it indicates that the gas pressure inside the encrypted empty wall is lower than the safety threshold value POt and a pressurization signal is generated.

[0013] Furthermore, upon receiving the pressurization signal, the controller immediately inflates the interior through the air inlet joint to strengthen the sealing of the furnace opening.

[0014] Furthermore, multiple groups of mounting supports are installed on the circumferential outer wall of the sealing disk, and three groups of sealing limiting wheels transmission-connected to the sealing plate are provided on the outer wall of the mounting supports, and the three groups of sealing limiting wheels are staggered.

[0015] Furthermore, an expansion sleeve is installed on the outer wall of the furnace body and the furnace mouth, and the end of the expansion sleeve is engaged with the sealing disk. A sealing cover is installed on one side of the expansion sleeve, and a hot air inlet is provided above the sealing cover, a material outlet is provided below the sealing cover, and a discharge hopper is provided on the side wall of the sealing cover.

[0016] The technical effects and advantages of the present invention are as follows:

[0017] 1. The present invention uses sensors to monitor the degree of wear of the sealing material and the pressure in the sealing area in real time. In combination with the cylinder and the air inlet joint, it automatically compensates for the wear of the sealing material and the pressurization treatment of the sealing area, establishes a collaborative system of sensors and controllers, monitors the degree of wear of the sealing material in real time, and promptly optimizes the sealing control, significantly improving the sealing performance of the rotary waste heat drying furnace, reducing the risk of leakage, reducing maintenance costs, and extending the service life of the equipment. At the same time, through intelligent monitoring and automatic compensation technology, it improves the operating efficiency and safety of the equipment.

[0018] 2. The present invention uses a laser displacement sensor to monitor the wear of the graphite packing in real time, compensates for the wear in time, ensures the sealing effect, and dynamically compensates for the wear of the graphite packing, reducing the frequent replacement due to wear and reducing maintenance costs. The piezoresistive sensor is used to monitor the internal pressure of the encrypted empty wall in real time, inflates and pressurizes it in time to prevent leakage, and accurately controls the pressure of the encrypted empty wall to avoid equipment damage due to insufficient or excessive pressure. The two cooperate with each other for double encryption to further improve the sealing of the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of the overall structure of the present invention.

[0020] Figure 2 This is a three-dimensional diagram of the connection between the sealing disc, the sealing limit wheel and the air inlet joint.

[0021] Figure 3 It is a three-dimensional diagram of the inner structure of the sealing disk in the present invention.

[0022] Figure 4 This is a three-dimensional diagram of the connection between graphite packing, packing pressure plate and sealing plate.

[0023] Figure 5 This is a front view of the connection between the sealing limiting wheel and the sealing plate.

[0024] Figure 6 This is a front view of the overall structure of the sealing disk of the present invention.

[0025] Figure 7 This is a front view of the connection relationship between the furnace body and the sealing assembly in the present invention.

[0026] Figure 8 It is a schematic diagram of the direction of material and hot air movement in the present invention.

[0027] The accompanying drawings are:

[0028] 1. Sealing plate; 2. Graphite packing; 3. Packing pressure plate; 4. Air inlet connector; 5. Cylinder; 6. Sealing plate; 7. Expansion sleeve; 8. Enclosed wall; 9. Furnace body; 10. Hot air inlet; 11. Material outlet; 12. Sealing limit wheel; 13. Mounting support; 15. Discharge hopper. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figures 1-8 As shown, the problem that the existing technology cannot monitor the wear degree of the sealing material in real time and perform sealing control in time can be solved by the following solution;

[0031] A sealing mechanism for a rotary waste heat drying furnace in this embodiment includes a furnace body 9 and a sealing plate 1 fixedly arranged on the outer wall of the furnace mouth. A sealing assembly for sealing the furnace body 9 is provided on the outer side of the furnace body 9. The sealing assembly includes a sealing disk 6. Two circular grooves are provided on the inner wall of the sealing disk 6 near the sealing plate 1. Graphite packing 2 in contact with the sealing plate 1 is installed in the circular groove. A packing pressure plate 3 is also provided in the circular groove to press the graphite packing 2. A laser displacement sensor is installed on the outer wall of the sealing plate 1, that is, a laser beam is vertically irradiated on the surface of the graphite packing 2, and the distance change is calculated by the reflected light to judge the degree of wear of the graphite packing 2.

[0032] It should be noted that the sealing plate 1 is welded to the rotating furnace body 9 and is integral with the rotating furnace body 9. The sealing plate 1 is processed as a whole. The surface of the sealing plate 1 must be processed very flat. The sealing plate 1 and the furnace body 9 rotate together.

[0033] Multiple groups of cylinders 5 are vertically mounted on the outer wall of the sealing plate 6 corresponding to the packing pressure plate 3 to apply pressure to the packing pressure plate 3. The multiple groups of cylinders 5 are staggered to ensure uniform pressure when the packing pressure plate 3 presses the graphite packing 2.

[0034] It should be noted that the graphite packing 2 is installed in the circular groove of the sealing plate 6, and there is a packing pressure plate 3 between the graphite packing 2 and the sealing plate 6. Normally, the sealing plate 1 rotates and the sealing plate 6 does not rotate. The friction surface between the two is the friction between the graphite packing 2 and the sealing plate 1. Therefore, the graphite packing 2 not only plays a sealing role, but also plays a friction role.

[0035] It should be noted that the graphite packing 2 will wear out when the rotating furnace body 9 is continuously turned, and leakage will occur after wear. Therefore, a sealing plate 6 plus a cylinder 5 is designed. The cylinder 5 always presses the packing pressure plate 3, and the packing pressure plate 3 presses the graphite packing 2. When the graphite packing 2 wears a little, the cylinder 5 will extend a little to ensure that the graphite packing 2 can always press on the sealing plate 1.

[0036] The sealing disk 6 is located between the two groups of graphite packings 2 and has an inner wall 8 formed thereon. A plurality of air inlet connectors 4 for pressurizing the inner wall 8 are fixedly inserted on the outer wall of the sealing disk 6 corresponding to the inner wall 8. A piezoresistive sensor is embedded in the inner wall 8.

[0037] Multiple sets of mounting brackets 13 are installed on the circumferential outer wall of the sealing disc 6. Three sets of sealing limiting wheels 12 are provided on the outer wall of the mounting bracket 13 and are transmission-connected to the sealing plate 1. The three sets of sealing limiting wheels 12 are staggered. The purpose of the sealing limiting wheels 12 is to support the sealing disc 6 and ensure the stable positioning of the sealing disc 6.

[0038] An expansion sleeve 7 is also installed on the outer wall of the furnace mouth of the furnace body 9. The end of the expansion sleeve 7 is engaged with the sealing disk 6. A sealing cover is installed on one side of the expansion sleeve 7. A hot air inlet 10 is provided above the sealing cover, and a material outlet 11 is provided below the sealing cover. A discharge hopper 15 is provided on the side wall of the sealing cover.

[0039] It should be noted that the direction of the material and the hot air is opposite to each other in order to use the hot air to dry the material. The purpose of the sealing mechanism is to prevent the hot air from leaking out and to prevent the cold air from entering.

[0040] It should be noted that the sealing disc 6 is integrally machined from a steel plate and has a circular groove for mounting the graphite packing 2, an interface for mounting the cylinder 5, an interface for mounting the air inlet connector 4, and holes for mounting the expansion sleeve 7, the sealing limit wheel 12, and the mounting support 13. The purpose of the sealing disc 6 is to mount accessories such as the graphite packing 2 and the cylinder 5. The sealing disc 6 is fixed and does not rotate.

[0041] Example 2: Please refer to Figures 1-8 As shown, the piezoresistive sensor and the laser displacement sensor and the controller outside the rotary waste heat drying furnace constitute a furnace mouth sealing monitoring system;

[0042] The laser displacement sensor is used to collect the wear amount ΔD of graphite. Wear amount ΔD = real-time measurement distance Dt - initial reference distance D0, where the initial reference distance D0 is the initial distance measured by the laser displacement sensor when the graphite packing 2 is not worn, that is, the vertical distance from the laser displacement sensor to the surface of the graphite packing 2; the real-time measurement distance D tIt is represented by the real-time distance measured by the laser displacement sensor after the graphite packing 2 is worn, that is, the current vertical distance from the laser displacement sensor to the surface of the graphite packing 2. As can be seen from the above, the wear amount ΔD is represented by the reduction in the thickness of the graphite packing 2, and the wear amount ΔD is sent to the controller.

[0043] The controller obtains the wear amount ΔD and compares and analyzes it with the safety threshold ΔDmax in the controller database;

[0044] When the wear amount ΔD ≥ the safety threshold ΔDmax, it means that the wear amount of the graphite packing 2 exceeds the safety threshold and a compensation sealing signal is generated;

[0045] It should be noted that the safety threshold ΔDmax is 0.5 mm, which is the maximum allowable wear value set based on the material properties of the graphite packing 2, sealing requirements and equipment operating conditions;

[0046] When the controller receives the compensation sealing signal, the controller controls the cylinder 5 to extend the preset compensation stroke to restore the thickness of the graphite packing 2 to the initial value or close to the initial value, ensuring the sealing of the graphite packing 2 to the sealing plate 1;

[0047] It should be explained here that the compensation stroke ΔL is usually equal to the wear amount ΔD, and the stroke of the cylinder 5 is controlled by a proportional solenoid valve or a stepper motor to ensure the compensation accuracy;

[0048] The wear of the graphite packing 2 is monitored in real time by a laser displacement sensor, and the wear is compensated in time to ensure the sealing effect. The wear of the graphite packing 2 is dynamically compensated, which reduces the frequent replacement caused by wear, reduces maintenance costs, and further improves the sealing of the furnace body 9.

[0049] The piezoresistive sensor is used to collect the gas pressure value Po inside the encrypted empty wall 8 and send the pressure value Po to the controller. When the controller obtains the pressure value PO, it immediately compares and analyzes it with the safety threshold value POt in the controller database. When the pressure value PO ≤ the safety threshold value POt, it indicates that the gas pressure inside the encrypted empty wall 8 is lower than the safety threshold value POt and generates a pressurization signal;

[0050] It should be noted that the safety threshold POt is the critical value of the gas pressure inside the encrypted hollow wall 8, which is used to determine whether the sealed area needs to be inflated and pressurized. Its setting must comprehensively consider the sealing requirements, equipment working conditions and material properties to ensure reliable sealing performance and avoid excessive pressurization.

[0051] When the controller receives the pressurization signal, it immediately inflates the interior through the air inlet connector 4 to strengthen the sealing of the furnace opening; ensuring the reliability and sealing effect of the rotary waste heat drying furnace sealing mechanism, extending the service life of the equipment and reducing maintenance costs;

[0052] The piezoresistive sensor is used to monitor the internal pressure of the encrypted empty wall 8 in real time, and to timely inflate and pressurize it to prevent leakage. The pressure of the encrypted empty wall 8 is also accurately controlled to avoid equipment damage caused by insufficient or excessive pressure, thereby further improving the sealing of the furnace body 9.

[0053] In the present invention, it can be seen from the combination of Example 1 and Example 2 that: the wear degree of the sealing material and the pressure of the sealing area are monitored in real time by the sensor, and the wear of the sealing material and the pressurization treatment of the sealing area are automatically compensated in combination with the cylinder and the air inlet joint 4. A collaborative system of sensors and controllers is established to monitor the wear degree of the sealing material in real time and timely optimize the sealing control, thereby significantly improving the sealing performance of the rotary waste heat drying furnace, reducing the risk of leakage, reducing maintenance costs, and extending the service life of the equipment. At the same time, through intelligent monitoring and automatic compensation technology, the operating efficiency and safety of the equipment are improved;

[0054] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sealing mechanism for a rotary waste heat drying furnace, comprising a furnace body (9) and a sealing plate (1) fixedly arranged on the outer wall of the furnace mouth, characterized in that: The outer side of the furnace body (9) is provided with a sealing assembly for sealing the furnace body (9), the sealing assembly comprising a sealing disc (6), two circular grooves being provided on the inner wall of the sealing disc (6) close to the sealing plate (1), graphite packings (2) being installed in the circular grooves and being in contact with the sealing plate (1), and packing pressing plates (3) being provided in the circular grooves for pressing the graphite packings (2), and a laser displacement sensor being installed on the outer wall of the sealing plate (1); Multiple groups of cylinders (5) for applying pressure to the packing pressure plate (3) are vertically mounted on the outer walls of the sealing disk (6) corresponding to the packing pressure plate (3), and the multiple groups of cylinders (5) are staggered.

2. The sealing mechanism for a rotary waste heat drying furnace according to claim 1, characterized in that: The sealing disk (6) is located between two groups of graphite packings (2) and has an encrypted hollow wall (8) on its inner wall. A plurality of air inlet joints (4) for pressurizing the encrypted hollow wall (8) are fixedly inserted on the outer wall of the sealing disk (6) corresponding to the encrypted hollow wall (8). A piezoresistive sensor is embedded inside the encrypted hollow wall (8).

3. The sealing mechanism for a rotary waste heat drying furnace according to claim 2, characterized in that: The piezoresistive sensor and the laser displacement sensor and the controller outside the rotary waste heat drying furnace constitute a furnace mouth sealing monitoring system.

4. The sealing mechanism for a rotary waste heat drying furnace according to claim 3, characterized in that: The laser displacement sensor is used to collect the wear amount ΔD of graphite, which is expressed as the real-time measurement distance D t Subtract the value of the initial reference distance D0 and send the wear amount ΔD to the controller. The controller obtains the wear amount ΔD and compares it with the safety threshold ΔDmax in the controller database. When the wear amount ΔD ≥ the safety threshold ΔDmax, it indicates that the wear amount of the graphite packing (2) exceeds the safety threshold and a compensation sealing signal is generated. When the controller receives the compensation sealing signal, it controls the cylinder (5) to extend a preset compensation stroke.

5. The sealing mechanism for a rotary waste heat drying furnace according to claim 4, characterized in that: The initial reference distance D0 is represented by the initial distance measured by the laser displacement sensor when the graphite packing (2) is not worn, and the real-time measurement distance D t It is represented as the real-time distance measured by the laser displacement sensor after the graphite packing (2) is worn.

6. The sealing mechanism for a rotary waste heat drying furnace according to claim 5, characterized in that: The piezoresistive sensor is used to collect the gas pressure value Po inside the encrypted empty wall (8) and send the pressure value Po to the controller. When the controller obtains the pressure value PO, it immediately compares and analyzes it with the safety threshold value POt in the controller database. When the pressure value PO≤safety threshold value POt, it indicates that the gas pressure inside the encrypted empty wall (8) is lower than the safety threshold value POt and generates a pressurization signal.

7. The sealing mechanism for a rotary waste heat drying furnace according to claim 6, characterized in that: When the controller receives the pressurization signal, it immediately inflates the interior through the air inlet connector (4) to strengthen the sealing of the furnace opening.

8. The sealing mechanism for a rotary waste heat drying furnace according to claim 2, characterized in that: Multiple groups of mounting supports (13) are installed on the circumferential outer wall of the sealing disc (6), and three groups of sealing limiting wheels (12) that are transmission-connected to the sealing plate (1) are arranged on the outer wall of the mounting supports (13), and the three groups of sealing limiting wheels (12) are staggered.

9. The sealing mechanism for a rotary waste heat drying furnace according to claim 8, characterized in that: An expansion sleeve (7) is also installed on the outer wall of the furnace mouth of the furnace body (9), and the end of the expansion sleeve (7) is engaged with the sealing disk (6). A sealing cover is installed on one side of the expansion sleeve (7), and an air inlet (10) is provided above the sealing cover, and a material outlet (11) is provided below the sealing cover, and a discharge hopper (15) is provided on the side wall of the sealing cover.

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