Rapid chain plate furnace cleaning device suitable for various materials

By designing a quick cleaning device for chain furnaces that are suitable for a variety of materials, the coordinated work of hard brushes and cross brushes is used, combined with water and gas fluid cleaning and negative pressure collection, the problems of low efficiency and poor results of chain furnace chain furnaces are solved, achieving efficient and comprehensive cleaning results and clean environment.

CN120383151AInactive Publication Date: 2025-07-29GUANGZHOU LAILIHONG FOOD IND CO LTD
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Patent Information

Application Number
CN202510876964.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-27
Publication Date
2025-07-29
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing chain plate furnace chain plate cleaning efficiency is low, the effect is poor, the labor intensity is high, the traditional mechanical cleaning device has a single function, lacks effective dirt collection, and is insufficient versatility, making it difficult to adapt to the cleaning needs of a variety of materials.

Method used

A quick cleaning device including cleaning boxes, hard bristle brushes, cross brush plates, DC motors, negative pressure fans and other components is designed. Through the reciprocating movement of the hard bristle brushes and the high-speed rotation of the cross brush plate, combined with water and air fluid cleaning and negative pressure collection, it achieves all-round cleaning and adapts to the cleaning of a variety of materials.

Benefits of technology

It realizes efficient and comprehensive chain board cleaning, reduces manual operations, avoids secondary pollution, adapts to the cleaning needs of a variety of materials, and improves cleaning efficiency and environmental cleanliness.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the field of mechanical equipment cleaning, and discloses a chain plate furnace rapid cleaning device suitable for various materials, the chain plate furnace rapid cleaning device comprises a cleaning box, a plurality of cleaning grooves are formed in the bottom end of the cleaning box, short shafts are movably installed on the inner tops of the cleaning grooves, cross brush plates are fixedly installed at the bottom ends of the short shafts, and the cross brush plates are fixedly installed on the cleaning box. A support is fixedly installed on one side of the cleaning box, guide rods are fixedly installed on the two sides of the interior of the support, the outer diameters of the guide rods are movably installed on the two sides of the interior of a movable frame respectively, a scrubbing brush is fixedly installed at the bottom end of the movable frame, and a direct current motor is fixedly installed on one side of the support. The driving end of the direct current motor extends into the support and is fixedly provided with a movable shaft. Through reciprocating motion of the scrubbing brush, rotation of the cross-shaped brush plate and deep cleaning of water vapor fluid, efficient and comprehensive cleaning is achieved in cooperation with negative pressure dirt collection, and the cleaning device is convenient to install, suitable for multiple materials, high in automation degree, energy-saving and environmentally friendly.
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Description

Technical Field

[0001] The present invention relates to the field of mechanical equipment cleaning, and specifically to a rapid cleaning device for chain grate furnaces adaptable to various materials. Background Art

[0002] In modern industrial production, chain grate furnaces, as important material processing equipment, are widely used in multiple fields such as food processing, metallurgy, and chemical industry. Chain grate furnaces convey materials through chain conveyors. During long-term operation, various material residues, oil stains, dust, and other pollutants will remain on the surface of the chain plates. These pollutants will not only affect the normal operation of the chain plates, reduce the service life of the equipment, but also may contaminate the materials processed subsequently and affect product quality.

[0003] Currently, for the cleaning of the chain plates of chain grate furnaces, most enterprises still adopt manual cleaning or simple mechanical cleaning methods. Manual cleaning has low efficiency, high labor intensity, and it is difficult to guarantee the cleaning effect. Especially for stubborn stains and complex structural parts, the cleaning difficulty is high, and it is easy to have cleaning dead corners. Simple mechanical cleaning devices have a single function and usually can only complete single brushing or dust suction work, and cannot achieve a comprehensive and in-depth cleaning of the chain plates. At the same time, these devices often lack an effective dirt collection and treatment system, and the garbage and sewage generated during the cleaning process are prone to cause secondary pollution, requiring additional cleaning work. In addition, most of the existing cleaning devices can only adapt to specific types of materials or chain plates, with poor versatility and it is difficult to meet the diverse production needs of enterprises. With the continuous expansion of industrial production scale and the increasing requirements for product quality, developing a rapid cleaning device that can efficiently and comprehensively clean chain plates and is applicable to various materials has become an urgent problem in the industry. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a rapid cleaning device for chain grate furnaces adaptable to various materials, which solves the problems of low manual efficiency, poor cleaning effect and single function of traditional mechanical cleaning, lack of effective dirt collection, and insufficient versatility in the cleaning of chain plates of chain grate furnaces, and realizes efficient and comprehensive cleaning, convenient installation, automatic operation, and multi-material adaptation.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A rapid cleaning device for chain grate furnaces adaptable to various materials, including a cleaning tank, several cleaning grooves are opened at the bottom end of the cleaning tank, short shafts are movably installed at the inner tops of the cleaning grooves respectively, cross brush plates are fixedly installed at the bottom ends of the short shafts respectively, a support is fixedly installed on one side of the cleaning tank, guide rods are fixedly installed on both sides inside the support respectively, the outer diameters of the guide rods are movably installed on both sides inside a movable frame respectively, a hard brush is fixedly installed at the bottom end of the movable frame, a DC motor is fixedly installed on one side of the support, and the driving end of the DC motor extends into the support and is fixedly installed with a movable shaft.

[0006] Preferably, the top ends of the short axes all extend into the interior of the cleaning tank and are fixedly installed with transmission wheels, and the outer diameters of the transmission wheels are connected by a transmission belt.

[0007] Preferably, a water guiding pipe is fixedly installed on one side of the inner bottom of the cleaning tank, and one end of the water guiding pipe extends to the outside of the cleaning tank. A plurality of branch pipes are fixedly installed on the inner side end of the water guiding pipe, and the ends of the branch pipes all extend into the corresponding cleaning tank.

[0008] Preferably, a dust collection port is opened on one side of the bottom end of the cleaning tank, a dust collection pipe is fixedly installed at the top end of the dust collection port, a collection chamber is fixedly installed at the top end of the cleaning tank, the end of the dust collection pipe extends into the interior of the collection chamber, and a negative pressure fan is fixedly installed at the top end of the collection chamber.

[0009] Preferably, a first clamping plate is fixedly installed on the outer diameter of one side of the movable shaft, a second clamping plate is fixedly installed at the end of the movable frame close to the DC motor, a plurality of hemispherical protrusions are fixedly installed on the inner side ends of the first clamping plate and the second clamping plate, and the fixed positions of the two groups of hemispherical protrusions are staggered with each other. Both sides of the end of the movable frame close to the DC motor are connected to the inner side wall of the bracket through a return spring.

[0010] Preferably, the end of the movable shaft extends into the interior of the cleaning tank and is fixedly installed with a driving bevel gear, and the top end of the middle short shaft is fixedly installed with a driven bevel gear, and the inner side ends of the driven bevel gear and the driving bevel gear are meshed and connected.

[0011] Preferably, fixed frames are fixedly installed at both ends of the bottom of the cleaning tank, knobs are threadedly connected to the middle parts of the outer side ends of the fixed frames, and pressing plates are fixedly installed at the inner side ends of the knobs.

[0012] The present invention provides a chain plate furnace rapid cleaning device suitable for a variety of materials. It has the following beneficial effects: 1. In the present invention, through the collaborative work of the hard brush and the cross brush plate, the rapid reciprocating movement of the hard brush can effectively remove stubborn stains on the surface of the chain plate; the cross brush plate rotates at a high speed, can sweep the garbage to the dust collection port, and at the same time cooperate with the high-speed water vapor fluid formed by the cleaning water to realize the deep cleaning of the surface of the chain plate, achieving an all-round and dead-angle-free cleaning effect.

[0013] 2. The present invention drives the movable shaft through a DC motor, and utilizes the tooth-engaging structure of the first clamping plate and the second clamping plate and the return spring to realize the automatic reciprocating motion of the hard brush; the meshing transmission of the driving bevel gear and the driven bevel gear drives the cross brush plate to rotate automatically, reducing manual operation and improving the cleaning efficiency. The negative pressure fan, in cooperation with the dust collection pipe and the collection chamber, can timely suck the dirt generated during cleaning into the collection chamber, and heavy garbage such as sewage falls into the bottom for collection, avoiding secondary pollution, keeping the working environment clean, and facilitating subsequent unified treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a perspective view of the present invention; Figure 2 is a schematic diagram of the internal structure of the cleaning tank in the present invention; Figure 3 is a bottom view of the present invention; Figure 4 is a side view of the cleaning tank in the present invention; Figure 5 is a top view of the present invention; Figure 6 of the present invention Figure 5 is an enlarged view of part A in the present invention.

[0015] Among them, 1. Cleaning tank; 2. Cleaning trough; 3. Short shaft; 4. Cross brush plate; 5. Driving wheel; 6. Driving belt; 7. Water inlet pipe; 8. Branch pipe; 9. Dust collection port; 10. Dust collection pipe; 11. Collection chamber; 12. Negative pressure fan; 13. Bracket; 14. Guide rod; 15. Movable frame; 16. Hard brush; 17. DC motor; 18. Movable shaft; 19. First clamping plate; 20. Second clamping plate; 21. Hemispherical protrusion; 22. Return spring; 23. Driving bevel gear; 24. Driven bevel gear; 25. Fixed frame; 26. Knob; 27. Pressure plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Embodiment: Please refer to the attached Figure 1 - attached Figure 6 , the embodiment of the present invention provides a chain grate furnace rapid cleaning device suitable for various materials, such as Figure 1As shown in the figure, it includes a cleaning tank 1. The cleaning tank 1 is in the shape of a cuboid as a whole and is made of high-strength corrosion-resistant stainless steel material, which can effectively resist the erosion of various cleaning liquids during the cleaning process and ensure the service life of the device. A number of cleaning grooves 2 are opened at the bottom end of it. These cleaning grooves 2 are evenly distributed, and the depth and width of the groove body are precisely designed to be able to adapt to cross-brush plates 4 of different sizes and provide sufficient space for the flow and spraying of cleaning water. Short shafts 3 are movably installed at the inner tops of the cleaning grooves 2. The short shafts 3 are connected to the cleaning tank 1 through high-precision bearings to ensure smoothness and stability during rotation, reduce frictional losses. Cross-brush plates 4 are fixedly installed at the bottom ends of the short shafts 3. The cross-brush plates 4 are composed of high-strength nylon bristles and a strong plastic plate body. The nylon bristles have good elasticity and wear resistance and can effectively clean the garbage on the surface of the chain plate. A bracket 13 is fixedly installed on one side of the cleaning tank 1. The bracket 13 is an L-shaped steel structure and is firmly connected to the cleaning tank 1 by welding technology to provide reliable support for subsequent components. Guide rods 14 are fixedly installed on both inner sides of the bracket 13. The guide rods 14 are cylindrical metal rods with smooth surfaces. Their outer diameters are movably installed on both inner sides of the movable frame 15 respectively. The movable frame 15 can perform linear reciprocating motion along the guide rods 14. The guide rods 14 play an accurate guiding role to ensure the smoothness of the movement of the movable frame 15. A hard brush 16 is fixedly installed at the bottom end of the movable frame 15. The hard brush 16 is composed of densely arranged hard bristles and can strongly remove stubborn stains on the surface of the chain plate. A DC motor 17 is fixedly installed on one side of the bracket 13. The DC motor 17 is a high-torque and low-speed model and can provide stable power output. Its driving end extends into the interior of the bracket 13 and is fixedly installed with a movable shaft 18.

[0018] In this embodiment, the top ends of the short shafts 3 all extend into the interior of the cleaning tank 1 and are fixedly installed with transmission wheels 5. The transmission wheels 5 are disk structures with teeth. Their outer diameters are connected by a transmission belt 6. The transmission belt 6 is made of wear-resistant rubber material and has tooth patterns, which are closely matched with the tooth grooves of the transmission wheels 5, and can achieve stable and efficient power transmission to ensure the synchronous rotation of all short shafts 3.

[0019] Furthermore, the end of the movable shaft 18 extends into the interior of the cleaning tank 1 and is fixedly installed with a driving bevel gear 23. The driving bevel gear 23 is manufactured by a high-precision processing technology, and the tooth shape is precise, which can be closely meshed with the driven bevel gear 24. A driven bevel gear 24 is fixedly installed at the top end of the middle short shaft 3, and the driven bevel gear 24 is meshed and connected with the inner end of the driving bevel gear 23. This bevel gear transmission structure can change the direction of motion and transmit the rotational power of the movable shaft 18 to the short shaft 3. Furthermore, a water inlet pipe 7 is fixedly installed on one side of the inner bottom of the cleaning tank 1, and one end of the water inlet pipe 7 extends to the outside of the cleaning tank 1. The water inlet pipe 7 is made of pressure-resistant PVC pipe, which can withstand the water flow transportation under a certain pressure. A plurality of branch pipes 8 are fixedly installed at the inner side end of the water inlet pipe 7, and the ends of the branch pipes 8 all extend into the corresponding cleaning tank 2. The branch pipes 8 are evenly distributed, and their pipe diameters are reasonably designed according to the size of the cleaning tank 2 to ensure that the cleaning water can be evenly distributed into each cleaning tank 2.

[0020] Specifically, when the movable shaft 18 rotates, it will also drive the driving bevel gear 23 to rotate. The driving bevel gear 23 drives the driven bevel gear 24 and the short shaft 3 in the middle through precise tooth-shaped meshing transmission. The short shaft 3 will drive the transmission wheel 5 to rotate accordingly. By means of the transmission of the transmission belt 6, all the transmission wheels 5 and all the short shafts 3 are driven to rotate together, so as to drive all the cross brush plates 4 to rotate at a high speed. During the high-speed rotation of the cross brush plates 4, the garbage on the surface of the chain plate is swept to the dust collection port 9. Subsequently, cleaning water is introduced through the water inlet pipe 7. Under the action of the external water pressure, the cleaning water flows into the branch pipes 8 through the water inlet pipe 7, and then is discharged into each cleaning tank 2 through the branch pipes 8. The cross brush plates 4 rotating at a high speed disperse the cleaning water entering the cleaning tank 2 into small water droplets. These small water droplets are mixed with air to form a high-speed water-vapor fluid. The high-speed water-vapor fluid sprays onto the surface of the chain plate with a large impact force to deeply clean the surface of the chain plate.

[0021] Furthermore, a dust collection port 9 is opened on one side of the bottom end of the cleaning tank 1. The shape and size of the dust collection port 9 are optimized to collect the garbage swept from the surface of the chain plate to the maximum extent. A dust collection pipe 10 is fixedly installed at the top end of the dust collection port 9. The dust collection pipe 10 is a rigid pipe, connecting the dust collection port 9 and the collection chamber 11. A collection chamber 11 is fixedly installed at the top end of the cleaning tank 1. The internal space of the collection chamber 11 is relatively large and can accommodate a large amount of dirt. The end of the dust collection pipe 10 extends into the interior of the collection chamber 11. A negative pressure fan 12 is fixedly installed at the top end of the collection chamber 11. The negative pressure fan 12 is a high-power model and can generate a strong suction force to pump the inside of the collection chamber to a vacuum state.

[0022] Further, a first clamping plate 19 is fixedly installed on the outer diameter of one side of the movable shaft 18. The first clamping plate 19 is a circular metal plate with a smooth surface and a certain strength. One end of the movable frame 15 close to the DC motor 17 is fixedly installed with a second clamping plate 20. The second clamping plate 20 is similar in structure to the first clamping plate 19. A number of hemispherical protrusions 21 are fixedly installed on the inner ends of both the first clamping plate 19 and the second clamping plate 20, and the fixed positions of the two groups of hemispherical protrusions 21 are staggered with each other. The hemispherical protrusions 21 are made of high-strength rubber material, having good elasticity and wear resistance. Both sides of one end of the movable frame 15 close to the DC motor 17 are connected to the inner side wall of the bracket 13 through return springs 22. The return springs 22 have appropriate spring coefficients, which can ensure that the movable frame 15 quickly returns to its original position after completing a reciprocating motion.

[0023] Specifically, after the DC motor 17 is powered on, it drives the movable shaft 18 to rotate through the driving end. The rotation of the movable shaft 18 drives the first clamping plate 19 to rotate. Since the fixed positions of the hemispherical protrusions 21 on the inner ends of the first clamping plate 19 and the second clamping plate 20 are staggered with each other, when the first clamping plate 19 rotates, the hemispherical protrusions 21 will squeeze and separate from the hemispherical protrusions 21 of the second clamping plate 20. By using the gear-like structure formed by the two groups of hemispherical protrusions 21 and cooperating with the elastic action of the return springs 22, the movable frame 15 can be driven to make a rapid reciprocating motion along the direction of the guide rod 14, thereby driving the hard brush 16 at the bottom of the movable frame 15 to follow the rapid reciprocating motion. During the reciprocating motion of the hard brush 16, it can strongly brush the surface of the chain plate, effectively cleaning the stubborn stains and dirt on the surface of the chain plate.

[0024] Further, fixing frames 25 are fixedly installed at both ends of the bottom of the cleaning box 1. The fixing frames 25 are U-shaped metal frames with good rigidity. Knobs 26 are threadedly connected to the middle parts of the outer ends of the fixing frames 25. The surfaces of the knobs 26 are provided with anti-slip patterns for the convenience of the operator to rotate. Pressure plates 27 are fixedly installed at the inner ends of the knobs 26. The pressure plates 27 are made of rubber material, which can increase the friction with the chain plate conveyor belt and avoid damaging the conveyor belt at the same time.

[0025] Working principle: First, place the device on both sides of the chain conveyor belt of the chain grate furnace. Rotate the knobs 26 on both sides to drive the pressing plates 27 to move inward. Since the knobs 26 are threadedly connected to the fixed brackets 25, as the knobs 26 rotate, the pressing plates 27 can be precisely pushed inward, thereby clamping and fixing the device above the chain conveyor belt. This fixing method is simple and reliable and can adapt to chain conveyor belts of different widths. Subsequently, start the chain conveyor belt so that all the chain plates start to move. At this time, start the DC motor 17. After the DC motor 17 is powered on, it drives the movable shaft 18 to rotate through the drive end. The rotation of the movable shaft 18 drives the first clamping plate 19 to rotate. Since the fixed positions of the hemispherical protrusions 21 at the inner ends of the first clamping plate 19 and the second clamping plate 20 are staggered, when the first clamping plate 19 rotates, the hemispherical protrusions 21 will squeeze and separate from the hemispherical protrusions 21 of the second clamping plate 20. Using the gear-like structure formed by the two groups of hemispherical protrusions 21 and the elastic action of the return spring 22, the movable frame 15 can be driven to make a rapid reciprocating motion along the direction of the guide rod 14, thereby driving the hard brush 16 at the bottom of the movable frame 15 to follow the rapid reciprocating motion. During the reciprocating motion of the hard brush 16, it can strongly brush the surface of the chain plate, effectively cleaning the stubborn stains and dirt on the surface of the chain plate. When the movable shaft 18 rotates, it will also drive the driving bevel gear 23 to rotate. The driving bevel gear 23 drives the driven bevel gear 24 and the short shaft 3 in the middle to rotate through precise tooth-shaped meshing transmission. The short shaft 3 drives the transmission wheel 5 to rotate. Using the transmission of the transmission belt 6, all the transmission wheels 5 and all the short shafts 3 are driven to rotate together, thereby driving all the cross brush plates 4 to rotate at high speed. During the high-speed rotation of the cross brush plates 4, the garbage on the surface of the chain plate is swept to the dust collection port 9. Subsequently, cleaning water is introduced through the water inlet pipe 7. Under the action of the external water pressure, the cleaning water flows into the branch pipes 8 through the water inlet pipe 7 and then is discharged into each cleaning tank 2 through the branch pipes 8. The cross brush plates 4 rotating at high speed disperse the cleaning water entering the cleaning tank 2 into fine water droplets. These fine water droplets form a high-speed water-vapor fluid after mixing with air. The high-speed water-vapor fluid sprays onto the surface of the chain plate with a large impact force, performing a deep cleaning on the surface of the chain plate. At the same time, the negative pressure fan 12 above the collection chamber 11 is started. The negative pressure fan 12 operates at high speed, and the strong suction instantly evacuates the collection chamber 11 to a vacuum. The huge negative pressure sucks the dirt generated by the cleaning through the dust collection pipe 10 into the collection chamber 11. Heavy garbage such as sewage falls to the bottom of the collection chamber 11 under the action of gravity for collection. As the chain conveyor belt continues to convey, the device can clean all the chain plates in a cyclic and repetitive manner.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rapid cleaning device for chain plate furnaces adaptable to multiple materials, comprising a cleaning tank (1), characterized in that, A plurality of cleaning grooves (2) are formed at the bottom end of the cleaning box (1). Short shafts (3) are movably installed at the inner tops of the cleaning grooves (2). Cross brush plates (4) are fixedly installed at the bottom ends of the short shafts (3). A bracket (13) is fixedly installed on one side of the cleaning box (1). Guide rods (14) are fixedly installed on both sides inside the bracket (13). The outer diameters of the guide rods (14) are respectively movably installed on both sides inside a movable frame (15). A hard brush (16) is fixedly installed at the bottom end of the movable frame (15). A DC motor (17) is fixedly installed on one side of the bracket (13). The driving end of the DC motor (17) extends into the bracket (13) and a movable shaft (18) is fixedly installed thereon.

2. The quick cleaning device for chain grate furnaces adaptable to multiple materials according to claim 1, wherein, The top ends of the short shafts (3) all extend into the cleaning box (1) and transmission wheels (5) are fixedly installed thereon. The outer diameters of the transmission wheels (5) are connected by a transmission belt (6).

3. The quick cleaning device for chain grate furnaces adaptable to multiple materials according to claim 1, characterized in that, A water inlet pipe (7) is fixedly installed on one side of the inner bottom of the cleaning box (1) and one end of the water inlet pipe (7) extends outside the cleaning box (1). A plurality of branch pipes (8) are fixedly installed at the inner side end of the water inlet pipe (7) and the ends of the branch pipes (8) all extend into the corresponding cleaning grooves (2).

4. A quick cleaning device for chain grate furnaces adaptable to multiple materials according to claim 1, characterized in that, A dust collection port (9) is formed at one side of the bottom end of the cleaning box (1). A dust collection pipe (10) is fixedly installed at the top end of the dust collection port (9). A collection chamber (11) is fixedly installed at the top end of the cleaning box (1). The end of the dust collection pipe (10) extends into the collection chamber (11). A negative pressure fan (12) is fixedly installed at the top end of the collection chamber (11).

5. A quick cleaning device for chain grate furnaces adaptable to multiple materials according to claim 1, characterized in that, A first clamping plate (19) is fixedly installed on the outer diameter of one side of the movable shaft (18). A second clamping plate (20) is fixedly installed at one end of the movable frame (15) close to the DC motor (17). A plurality of hemispherical protrusions (21) are fixedly installed on the inner side ends of the first clamping plate (19) and the second clamping plate (20), and the fixing positions of the two groups of hemispherical protrusions (21) are staggered with each other. Both sides of one end of the movable frame (15) close to the DC motor (17) are connected to the inner side wall of the bracket (13) by a return spring (22).

6. The quick cleaning device for chain grate furnaces adaptable to multiple materials according to claim 1, characterized in that, The end of the movable shaft (18) extends into the cleaning box (1) and a driving bevel gear (23) is fixedly installed thereon. A driven bevel gear (24) is fixedly installed at the top end of the middle short shaft (3), and the inner side end of the driven bevel gear (24) is meshed and connected with the inner side end of the driving bevel gear (23).

7. The quick cleaning device for chain grate furnaces adaptable to multiple materials according to claim 1, characterized in that, Fixing frames (25) are fixedly installed at both ends of the bottom of the cleaning box (1). Knobs (26) are threadedly connected to the middle parts of the outer side ends of the fixing frames (25). Pressure plates (27) are fixedly installed at the inner side ends of the knobs (26).