A large-caliber green environmentally friendly kiln

Abstract

The invention relates to the field of kilns, and in particular to a large-caliber green and environmentally friendly kiln for zinc oxide resistors. In view of the significant problems in the current prior art such as high energy consumption and complicated operation process, a large-caliber green and environmentally friendly kiln is provided, including a furnace body, which is divided into multiple functional areas, including a waste discharge section, a temperature rise and preheating section, a heating and insulation section, and a cooling section. The functional areas are separated by staggered foam insulation bricks, and a waste discharge fan and a waste heat fan are arranged above the furnace body. The furnace body is provided with a furnace cavity, and a transmission device is arranged on the outside of the furnace body and the furnace cavity for conveying a material box. Energy consumption is reduced and resource utilization is improved. Furthermore, the equipment has a reasonable structural design, simple operation, convenient maintenance and reasonable spatial layout, which reduces the labor intensity in the production process.

Description

Technical Field

[0001] The invention relates to the field of kilns, and in particular to a large-caliber green and environmentally friendly kiln for zinc oxide resistors. Background Art

[0002] In the current kiln technology, there are generally significant problems such as high energy consumption, complicated operation process and excessive space occupation, which largely restrict the urgent needs of modern industrial production for high efficiency, environmental protection and energy saving. Especially when dealing with the sintering task of large-diameter products, it leads to adverse consequences such as continuous increase in production costs; therefore, a large-diameter green and environmentally friendly kiln is proposed to solve the above-mentioned problems. Summary of the invention

[0003] The present invention aims at the problem that current equipment or prior art has no suitable products for solving the above problems, and that the energy consumption is high, the operation process is complicated and the space occupied is too large during use. The present invention provides a large-caliber green and environmentally friendly kiln, which can effectively reduce the energy consumed during operation and improve resource utilization. Secondly, the equipment has a reasonable structural design, simple operation, convenient maintenance and reasonable spatial layout, which reduces the labor intensity in the production process and effectively solves the problems mentioned in the above background technology.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: A large-caliber green environmentally friendly kiln comprises a furnace body, which is divided into multiple functional areas, including a waste discharge section, a temperature rise and preheating section, a heating and heat preservation section, and a cooling section. The functional areas are separated by offset foam insulation bricks. A waste discharge fan and a waste heat fan are arranged above the furnace body, the furnace body is provided with a furnace cavity, and transmission devices are arranged on the outside of the furnace body and the furnace cavity to convey material boxes.

[0005] The furnace body is divided into an inner side, a transition layer and an outer side. The inner side uses mullite bricks, the transition layer uses aluminum silicate hard board and standard fiberboard, and the outer side of the furnace body is installed with a high aluminum plate.

[0006] The exhaust fan exhaust port is sealed and connected to one end of the exhaust main pipe, the exhaust main pipe is connected to a plurality of equidistantly distributed exhaust branch pipes, the exhaust branch pipes are inserted into the exhaust section and connected to the exhaust air hood, and the exhaust port of the exhaust fan is sealed and connected to the smoke exhaust duct.

[0007] The exhaust port of the waste heat fan is sealed and connected to one end of the exhaust main pipe, the exhaust main pipe is connected to a plurality of equally distributed exhaust branch pipes, the exhaust branch pipes are inserted into the cooling section and connected to the exhaust air hood, the exhaust port of the waste heat fan is sealed and connected to one end of the pipe, and the other end of the pipe is inserted into the heating preheating section so that the temperature emitted in the cooling section is transmitted to the heating preheating section.

[0008] The exterior of the waste exhaust main pipe, waste exhaust branch pipe and smoke exhaust pipe is subjected to external insulation treatment.

[0009] The exhaust main pipe, exhaust branch pipes and the outside of the pipeline are subjected to external insulation treatment.

[0010] The transmission device is divided into a first feeding section, a second feeding section and a third feeding section.

[0011] A lifting and steering conveying device is provided below the first feeding section and the third feeding section. The lifting and steering conveying device is composed of a lifting device and a conveying device. The lifting device includes a fixing plate fixedly connected to the first beam and the second beam. The fixing plate is provided with a through hole. A cylinder is fixedly provided below the fixing plate. The piston rod of the cylinder passes through the through hole and is fixedly connected to the lifting plate. A sleeve is fixedly connected above the fixing plate. A plug is provided below the lifting plate, and the plug can be inserted into the sleeve.

[0012] The conveying device is fixedly connected above the lifting plate, and the conveying device includes a support frame, the support frame is provided with a plurality of fixing holes which cooperate with the bearings, the outer ring of the bearing is sleeved into the fixing holes, the inner ring of the bearing is sleeved with a long shaft rod and a short shaft rod, the long shaft rod and the short shaft rod are fixedly connected to the pulley, a belt is sleeved between the pulleys, the long shaft rod is also fixedly connected to the first sprocket, the lifting plate is also provided with a motor, the motor shaft is connected to the second sprocket, and the first sprocket and the second sprocket are connected by a chain.

[0013] A guardrail is arranged above the first feeding section, the second feeding section and the third feeding section.

[0014] Compared with the prior art, the present invention has the following advantages: The waste heat fan is used to transfer the waste heat in the cooling section to the preheating section, reducing the energy consumption during the heating process of the preheating section. The first feeding section, the second feeding section and the third feeding section are used in conjunction with the lifting and steering conveying device to convey the material box into the furnace body for sintering. This allows the roller conveyor to be flexibly arranged in a limited space, effectively saving space and improving site utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an overall schematic diagram of a large-caliber green environmentally friendly kiln of the present invention; Figure 2 This is a schematic diagram of a large-caliber green environmentally friendly kiln body of the present invention; Figure 3 This is a schematic diagram of the composition of a large-caliber green environmentally friendly kiln body of the present invention; Figure 4 This is a schematic diagram of a large-caliber green environmentally friendly kiln transmission device of the present invention; Figure 5 This is a schematic diagram of a large-caliber green and environmentally friendly kiln lifting, turning and conveying device of the present invention; Figure 6This is the second schematic diagram of a large-caliber green and environmentally friendly kiln lifting, turning and conveying device of the present invention; Figure 7 This is a schematic diagram of disassembly and assembly of a large-caliber green and environmentally friendly kiln lifting, turning and conveying device of the present invention; Figure 8 It is a partial disassembly and assembly diagram of a large-caliber green and environmentally friendly kiln lifting, turning and conveying device of the present invention; Fig. 9 This is the third schematic diagram of a large-caliber green and environmentally friendly kiln lifting, turning and conveying device of the present invention; Explanation of the reference numerals in the figure: furnace body 1, waste discharge section 2, heating and preheating section 3, heating and heat preservation section 4, cooling section 5, waste discharge fan 6, waste heat fan 7, waste discharge main pipe 8, exhaust hood 9, smoke exhaust duct 10, duct 11, exhaust main pipe 12, mullite brick 13, aluminum silicate hard board 14, standard fiberboard 15, high aluminum board 16, furnace cavity 17, waste discharge branch pipe 18, exhaust branch pipe 19, third feeding section 20, first The feeding section 21, the second feeding section 22, the material box 23, the guardrail 24, the fixing plate 25, the first beam 26, the second beam 27, the cylinder 28, the sleeve 29, the lifting plate 31, the support frame 32, the fixing hole 33, the bearing 34, the motor 35, the long shaft rod 36, the pulley 37, the short shaft rod 38, the belt 39, the through hole 40, the plug 41, the second sprocket 42, the first sprocket 43, and the chain 44. DETAILED DESCRIPTION

[0016] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0017] like Figure 1-9 As shown, the present invention provides a large-caliber green environmentally friendly kiln, including a furnace body 1, which is divided into multiple functional areas, including a waste discharge section 2, a temperature rise and preheating section 3, a heating and heat preservation section 4 and a cooling section 5. The functional areas are separated by offset foam insulation bricks, and a waste discharge fan 6 and a waste heat fan 7 are arranged above the furnace body 1. The furnace body 1 is provided with a furnace cavity 17, and the outer side of the furnace body 1 and the furnace cavity 17 are provided with a transmission device for conveying a material box 23.

[0018] like Figure 1-4As shown, the large-caliber green and environmentally friendly kiln used in the zinc oxide resistor of the present invention has a design concept that adheres to the principles of energy conservation, emission reduction and circular economy. Compared with traditional kilns, it significantly reduces energy consumption and environmental pollution while ensuring the sintering quality; the furnace body 1 is divided into multiple functional areas, each of which has different tasks to ensure that each stage of product sintering can be accurately controlled. The first functional area is the waste discharge section 2. The main purpose of this stage is to discharge the waste gas generated during the sintering process to purify the internal environment of the kiln and create good atmosphere conditions for the subsequent sintering process; the second functional area is the heating and preheating section. During this stage, the product will be gradually heated to the preheating temperature to eliminate the stress inside the material and prevent defects such as cracks from occurring during the sintering process; the third functional area is the heating and insulation section 4. This stage is the key to the sintering process. In this part, the kiln will continue to heat up. Heat is applied to the material to make it reach the sintering temperature, and the material is kept warm to ensure that the material has enough time for grain growth and densification; the last stage is the cooling section 5, and the product will gradually cool down in this stage to prevent thermal stress caused by rapid temperature changes and ensure the dimensional accuracy and structural stability of the product; the functional areas are separated by offset foam insulation bricks, which not only enhances the overall stability of the furnace body 1, but also the material of the offset foam bricks has excellent thermal insulation properties, which helps to improve thermal efficiency and reduce heat loss; an exhaust fan 6 is provided above the furnace body 1 to discharge the waste gas generated in the sintering process by the exhaust section 2, and the waste heat fan 7 transfers the heat emitted by the product in the cooling section 5 to the heating preheating section 3 to reduce the energy consumption generated by its heating; the furnace body 1 is provided with a furnace chamber 17, and the material box 23 is conveyed into the furnace chamber 17 by a transmission device for sintering, and the material box 23 contains zinc oxide resistors that need to be sintered.

[0019] The furnace body 1 is divided into an inner side, a transition layer and an outer side. The inner side uses mullite bricks 13, the transition layer uses aluminum silicate hard board 14 and standard fiberboard 15, and the outer side of the furnace body 1 is installed with a high aluminum plate 16.

[0020] The furnace body 1 is composed of an inner side, a transition layer and an outer side. The inner side of the furnace body 1 is made of mullite bricks 13, which are resistant to high temperatures and thermal shock, can maintain stable physical properties under high temperature conditions, effectively resist high temperature erosion in the furnace, greatly extend the service life of the furnace body 1, and ensure the structural integrity of the furnace body 1 in long-term high-temperature operations; the transition layer is made of aluminum silicate hard board 14 and standard fiberboard 15, both of which are high-quality thermal insulation materials. Their combination greatly enhances the thermal insulation effect of the furnace body 1, and can effectively reduce heat loss, reduce energy consumption, and improve energy efficiency. The high aluminum plate 16 installed on the outside of the furnace body 1 not only plays a good protective role, can resist external physical collisions and chemical corrosion, protect the internal structure from damage, but also reflect part of the heat, further enhance the thermal insulation performance, and at the same time, the appearance of the high aluminum plate 16 is smooth and beautiful, which enhances the overall visual effect of the furnace body 1.

[0021] The exhaust port of the exhaust fan 6 is sealed and connected to one end of the exhaust main pipe 8, and the exhaust main pipe 8 is connected to multiple equally distributed exhaust branch pipes 18. The exhaust branch pipes 18 are inserted into the exhaust section 2 and connected to the exhaust air hood 9. The exhaust port of the exhaust fan 6 is sealed and connected to the smoke exhaust pipe 10.

[0022] The exhaust port of the exhaust fan 6 is tightly sealed and connected to one end of the exhaust main pipe 8. When the exhaust fan 6 starts to operate, a strong suction force is transmitted to the exhaust main pipe 8 along this connecting channel. Since the exhaust main pipe 8 is connected to multiple equidistantly distributed exhaust branch pipes 18, the suction force is evenly distributed on each exhaust branch pipe 18, which can ensure that the exhaust gas in each area of ​​the exhaust section 2 can be evenly sucked, avoiding the accumulation of local exhaust gas, and improving the comprehensiveness and efficiency of exhaust gas collection. The exhaust branch pipe 18 is inserted into the exhaust section 2 and connected to the exhaust hood 9. The exhaust hood 9 Suction is also generated at the place, which quickly and effectively sucks the waste gas in the waste discharge section 2 into the waste discharge branch pipe 18, and then is pumped to the waste exhaust fan 6 through the waste discharge main pipe 8. The sealed connection between the waste exhaust fan 6, the waste discharge main pipe 8 and the smoke exhaust duct 10 minimizes the leakage of waste gas during the transmission process, ensures the stability and environmental protection of the waste gas treatment system, and also avoids possible pollution and harm to the surrounding environment and personnel; then, the waste exhaust fan 6 discharges the sucked waste gas from its exhaust port through the sealed connected smoke exhaust duct 10 to the designated treatment area or high-altitude discharge.

[0023] The exhaust port of the waste heat fan 7 is sealed and connected to one end of the exhaust main pipe 12, and the exhaust main pipe 12 is connected to a plurality of equally distributed exhaust branch pipes 19, and the exhaust branch pipes 19 are inserted into the cooling section 5 and connected to the exhaust air hood. The exhaust port of the waste heat fan 7 is sealed and connected to one end of the pipe 11, and the other end of the pipe 11 is inserted into the heating preheating section 3 so that the temperature emitted in the cooling section 5 is transmitted to the heating preheating section 3.

[0024] The product after sintering needs to be cooled in the cooling section. In order to make efficient use of waste heat and truly achieve energy saving and efficiency improvement during the cooling process, a waste heat blower 7 is arranged above the furnace body 1. When the waste heat blower 7 starts to run, its exhaust port transmits the suction force to the exhaust main pipe 12 through the sealed connection with one end of the exhaust main pipe 12 by virtue of the strong suction force generated by itself. Since the exhaust main pipe 12 is connected to a plurality of equally distributed exhaust branch pipes 19, the suction force is evenly distributed to each exhaust branch pipe 19. These exhaust branch pipes 19 are inserted into the cooling The heat extraction hood generates suction force to quickly and efficiently draw the heat and hot air emitted in the cooling section 5 into the exhaust branch pipe 19, and then pump them to the waste heat blower 7 through the exhaust main pipe 12. Then, the waste heat blower 7 transports the absorbed hot gas out from the exhaust port through the sealed pipe 11, and the other end of the pipe 11 is inserted into the warming preheating section 3, so as to realize the transmission of the temperature emitted in the cooling section 5 to the warming preheating section 3, complete the transfer and reuse of heat, and reduce energy consumption.

[0025] The exterior of the exhaust main pipe 8, the exhaust branch pipe 18 and the smoke exhaust pipe 10 are subjected to external insulation treatment.

[0026] The exterior of the exhaust main pipe 12, the exhaust branch pipe 19 and the pipeline 11 is subjected to external insulation treatment.

[0027] The exhaust gas is usually at a high temperature. External insulation treatment is performed on the outside of the exhaust main pipe 8, the exhaust branch pipe 18 and the smoke exhaust duct 10 to prevent heat from being lost in large quantities through the pipe wall into the surrounding environment, causing the temperature of the workshop to rise, affecting the working environment and comfort of the workers. Through external insulation treatment, the heat emitted by the exhaust main pipe can be controlled inside the insulation layer, making the temperature distribution in the workshop more uniform and reasonable, creating a relatively comfortable working environment for the staff; external insulation treatment is performed on the outside of the exhaust main pipe 12, the exhaust branch pipe 19 and the pipeline 11, which can effectively reduce the heat loss during the waste heat transfer process, and ensure that the waste heat in the cooling section is transmitted to the insulation preheating section as much as possible, thereby greatly improving the energy utilization efficiency and significantly reducing energy consumption.

[0028] The transmission device is divided into a first feeding section 21 , a second feeding section 22 and a third feeding section 20 .

[0029] The transmission device is a roller conveyor, which belongs to the prior art and will not be described in detail. The zinc oxide resistor to be sintered is placed in the material box 23. The material box 23 is fed into the furnace body 1 by the third feeding section 20 after completing the circulation in the first feeding section 21 and the second feeding section 22 in turn. The zinc oxide resistor in the material box 23 completes the sintering work after passing through multiple functional areas, and finally produces qualified products. During the whole process, the feeding sections are closely connected, and the material box 23 is placed above the conveying plate. The width of the conveying plate can be transmitted on the roller conveyor without causing jamming. The focus is on the conveying function of the material box 23, laying the foundation for the sintering and forming of the product.

[0030] A lifting and diverting conveying device is provided below the first feeding section 21 and the third feeding section 20. The lifting and diverting conveying device is composed of a lifting device and a conveying device. The lifting device includes a fixed plate 25 fixedly connected to the first crossbeam 26 and the second crossbeam 27. The fixed plate 25 is provided with a through hole 40. A cylinder 28 is fixedly provided below the fixed plate 25. The piston rod of the cylinder 28 passes through the through hole 40 and is fixedly connected to the lifting plate 31. A sleeve 29 is fixedly connected above the fixed plate 25. A plug 41 is provided below the lifting plate 31. The plug 41 can be inserted into the sleeve 29.

[0031] A lifting and steering conveying device is provided below the first feeding section 21 and the third feeding section 20. This device cooperates with the first feeding section 21, the second feeding section 22 and the third feeding section 20 to steer and convey the material box 23. This device is composed of a lifting device and a conveying device; wherein the lifting device comprises a fixed plate 25 fixedly connected to the first crossbeam 26 and the second crossbeam 27, a through hole 40 is provided on the fixed plate 25, a cylinder 28 is fixedly installed below the fixed plate 25, a piston rod of the cylinder 28 passes through the through hole 40 and is connected to the lifting plate 31, so as to realize the lifting and lowering action of the lifting plate 31; at the same time, a sleeve 29 is fixedly connected above the fixed plate 25, and a sleeve 29 that can be inserted into the lifting plate 31 is provided below the lifting plate 31. The plug 41 in 9 can play a guiding and positioning role in the lifting process, and enhance stability; the advantage of such a structural design is that the lifting function is realized by driving the lifting plate by the cylinder, and the cooperation between the sleeve 29 and the plug 41 ensures the accuracy and stability of the lifting action, reduces shaking, and improves the reliability and work efficiency of the entire conveying system; a lifting and steering conveying device is provided under the first feeding section 21 and the third feeding section 20 to steer the material box 23 for transmission, so as to solve the problem of bypassing obstacles when the factory space is limited and the equipment is compactly placed, so that the conveying line perfectly fits the actual situation of the production workshop, effectively saves space, and improves the utilization rate of the site.

[0032] The lifting plate 31 is fixedly connected to a conveying device above, and the conveying device includes a support frame 32, and the support frame 32 is provided with a plurality of fixing holes 33 that cooperate with the bearing 34. The outer ring of the bearing 34 is sleeved into the fixing hole 33, and the inner ring of the bearing 34 is sleeved with a long shaft rod 36 and a short shaft rod 38. The long shaft rod 36 and the short shaft rod 38 are fixedly connected to the pulley 37, and a belt 39 is sleeved between the pulleys 37. The long shaft rod 36 is also fixedly connected to the first sprocket 43. The lifting plate 31 is also provided with a motor 35, and the second sprocket 42 is connected to the shaft of the motor 35. The first sprocket 43 and the second sprocket 42 are connected by a chain 44.

[0033] The conveying device is fixedly connected above the lifting plate 31, and the conveying device includes a support frame 32 arranged above the lifting plate, and the support frame 32 has a plurality of fixing holes 33 matched with the bearing 34. The outer ring of the bearing 34 is inserted into the fixing hole 33, and the inner ring is sleeved with a long shaft rod 36 and a short shaft rod 38. The long shaft rod 36 and the short shaft rod 38 are both fixedly connected to the pulley 37. The pulley 37 is sleeved with a belt 39. The long shaft rod 36 is also fixedly connected to the first sprocket 43. At the same time, a motor 35 is provided on the lifting plate 31, and the motor 35 is provided on the lifting plate 31. The 5-axis rod is connected to the second sprocket 42, and the first sprocket 43 and the second sprocket 42 are connected by a chain 44; the advantage of such a structure is that the cooperation between the bearing 34 and the fixing hole 33 ensures the smoothness and stability of the rotation of the long axis rod 36 and the short axis rod 38; the combination of the pulley 37 and the belt 39 can realize the continuous transportation of materials; and the motor 35 drives the long axis rod to rotate through the sprocket and the chain, which can provide stable and controllable power transmission, so that the conveying device can operate efficiently and stably to meet different conveying needs.

[0034] The use process of a large-caliber green environmentally friendly kiln of the present invention is as follows: first, the staff puts the zinc oxide resistor to be sintered into the material box 23, starts the roller conveyor to convey the material box 23, the first feeding section 21 conveys the material box 23 to the lifting and turning conveying device, and then starts the device to lift the material box 23, and then the pulley box and belt cooperate to convey it to the second feeding section 22, the second feeding section 22 conveys the material box 23 to the third feeding section 20, and the lifting and turning conveying device provided under the third feeding section 20 lifts the material box 23 and conveys it to the middle position of the third feeding section 20, so that the material box 23 is stably conveyed on the third feeding section 20, and the first feeding section 21, the second feeding section 22 and the third feeding section 20 are provided with a guardrail 24 to ensure that the material box 23 is conveyed in a relatively middle position, and finally enters the furnace body 1 to complete a series of sintering work.

[0035] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A large-caliber green environmentally friendly kiln, comprising a furnace body (1), characterized in that: The furnace body (1) is divided into a plurality of functional zones, the functional zones comprising a waste discharge section (2), a temperature rise preheating section (3), a heating and heat preservation section (4) and a cooling section (5), the functional zones being separated by offset foam insulation bricks, a waste discharge fan (6) and a waste heat fan (7) being arranged above the furnace body (1), the furnace body (1) being provided with a furnace cavity (17), and a transmission device being arranged on the outside of the furnace body (1) and the furnace cavity (17) for conveying a material box (23).

2. A large-caliber green environmentally friendly kiln as claimed in claim 1, characterized in that: The furnace body (1) is divided into an inner side, a transition layer and an outer side. The inner side uses mullite bricks (13), the transition layer uses aluminum silicate hard plates (14) and standard fiberboards (15), and the outer side of the furnace body (1) is installed with a high aluminum plate (16).

3. A large-caliber green environmentally friendly kiln as claimed in claim 1, characterized in that: The exhaust port of the exhaust fan (6) is sealedly connected to one end of the exhaust main pipe (8), the exhaust main pipe (8) is connected to a plurality of equally spaced exhaust branch pipes (18), the exhaust branch pipes (18) are inserted into the exhaust section (2) and connected to the exhaust air hood (9), and the exhaust port of the exhaust fan (6) is sealedly connected to the smoke exhaust pipe (10).

4. A large-caliber green environmentally friendly kiln as claimed in claim 1, characterized in that: The exhaust port of the waste heat fan (7) is sealedly connected to one end of the exhaust main pipe (12), the exhaust main pipe (12) is connected to a plurality of equally spaced exhaust branch pipes (19), the exhaust branch pipes (19) are inserted into the cooling section (5) and connected to the exhaust air hood, the exhaust port of the waste heat fan (7) is sealedly connected to one end of the pipe (11), and the other end of the pipe (11) is inserted into the heating preheating section (3) so that the temperature emitted in the cooling section (5) is transmitted to the heating preheating section (3).

5. A large-caliber green environmentally friendly kiln as claimed in claim 3, characterized in that: The exterior of the waste exhaust main pipe (8), the waste exhaust branch pipe (18) and the smoke exhaust pipe (10) is subjected to external insulation treatment.

6. A large-caliber green environmentally friendly kiln as claimed in claim 4, characterized in that: The exhaust main pipe (12), the exhaust branch pipe (19) and the pipeline (11) are subjected to external insulation treatment.

7. A large-caliber green environmentally friendly kiln as claimed in claim 1, characterized in that: The transmission device is divided into a first feeding section (21), a second feeding section (22) and a third feeding section (20).

8. A large-caliber green environmentally friendly kiln as claimed in claim 7, characterized in that: A lifting and diverting conveying device is provided below the first feeding section (21) and the third feeding section (20), and the lifting and diverting conveying device is composed of a lifting device and a conveying device. The lifting device comprises a fixing plate (25) fixedly connected to the first crossbeam (26) and the second crossbeam (27), the fixing plate (25) being provided with a through hole (40), a cylinder (28) being fixedly provided below the fixing plate (25), a piston rod of the cylinder (28) passing through the through hole (40) and being fixedly connected to the lifting plate (31), a sleeve (29) being fixedly connected above the fixing plate (25), a plug (41) being provided below the lifting plate (31), and the plug (41) being insertable into the sleeve (29).

9. A large-caliber green environmentally friendly kiln as claimed in claim 8, characterized in that: The lifting plate (31) is fixedly connected to a conveying device above, the conveying device comprising a support frame (32), the support frame (32) is provided with a plurality of fixing holes (33) which cooperate with the bearings (34), the outer ring of the bearing (34) is sleeved in the fixing holes (33), the inner ring of the bearing (34) is sleeved with a long shaft rod (36) and a short shaft rod (38), the long shaft rod (36) and the short shaft rod (38) are fixedly connected to a pulley (37), a belt (39) is sleeved between the pulleys (37), the long shaft rod (26) is also fixedly connected to a first sprocket (43), the lifting plate (31) is also provided with a motor (35), the shaft of the motor (35) is connected to a second sprocket (42), and the first sprocket (43) and the second sprocket (42) are connected by a chain (44).

10. A large-caliber green environmentally friendly kiln as claimed in claim 7, characterized in that: A protective fence (24) is provided above the first feeding section (21), the second feeding section (22) and the third feeding section (20).

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