CN219037621U - Mullite preheating kiln - Google Patents

Abstract

The utility model discloses a mullite preheating kiln, which comprises a base, wherein a firing kiln is fixedly connected to the top of the base near the right side, a preheating cave body is fixedly connected to the top of the base near the left side, a connecting box is fixedly connected to the right side of the preheating cave body near the bottom, air inlet pipes are plugged in the positions, near the bottom, of the right side of the connecting box, near the left side of the firing kiln, the right side of the connecting box is fixedly connected with a third motor, near the center, the positions, near the front and rear sides of the connecting box, of the inner cavity are fixedly connected with fixing plates, through mutual matching among all parts, mullite can be preheated, compared with the traditional heating mode, the loss of electric energy is saved, the production cost is reduced, the device is more environment-friendly, mullite is convenient to take and place after the preheating is finished, the convenience of the device operation is improved, and the working efficiency is improved.

Description

Mullite preheating kiln

Technical Field

The utility model relates to the technical field of mullite production and processing, in particular to a mullite preheating kiln.

Background

Mullite is a high-quality refractory raw material, the mineral is rare, mullite is a mineral generated by aluminosilicate at high temperature, mullite is formed when the aluminosilicate is artificially heated, natural mullite crystals are long and thin needle-shaped and are in radial clusters, mullite ore is used for producing high-temperature refractory materials, the mullite is mostly used as a thermal barrier coating in a C/C composite material, the application is wide, the mullite is a binary solid solution stable under normal pressure in an AI2O3-SiO2 element system, the natural mullite with a chemical formula of AI2O3-SiO2 is very few, and the mullite is artificially synthesized by a common sintering method or an electrofusion method;

when the mullite is sintered into mullite, the mullite is required to be placed in a firing kiln for firing, and the mullite is required to be preheated before firing, and a traditional preheating device usually adopts a mode of converting electric energy into heat energy to preheat the mullite, so that the energy loss is increased, and the production cost is increased.

Disclosure of Invention

In order to overcome the defects in the prior art, one of the purposes of the utility model is to provide a mullite preheating kiln.

One of the purposes of the utility model is realized by adopting the following technical scheme:

the mullite preheating kiln comprises a base, wherein a firing kiln is fixedly connected to the top of the base near the right side, a preheating cave body is fixedly connected to the position, close to the left side, of the top of the base, a connecting box is fixedly connected to the position, close to the bottom, of the right side of the preheating cave body, an air inlet pipe is inserted between the front side and the rear side of the right side of the connecting box and the position of the left side of the firing kiln near the bottom, a third motor is fixedly connected to the right side of the inner cavity of the connecting box near the center, a fixing plate is fixedly connected to the front side and the rear side of the inner cavity of the connecting box near the center, the fixed plate is provided with a plurality of through holes, a first bearing is fixedly connected to the position, close to the center, of the fixed plate, the inner cavity of the first bearing is provided with a rotating shaft in a penetrating way, the right end of the rotating shaft is fixedly connected with a power output shaft of a third motor, the left end of the rotating shaft is fixedly connected with a driving gear, the left side of the fixing plate is fixedly connected with second bearings near the front and rear sides, the inner cavities of the two second bearings are respectively inserted with a rotating rod, driven gears are fixedly sleeved on the outer sides of the two rotating rods near the center, the driven gears are mutually meshed with the driving gear, a plurality of second blades are fixedly connected on the outer edges of the two rotating rods near the left end, a plurality of transverse pipes are jointly penetrated and arranged at the left and right parts of the preheating cave body close to the bottom, the right ends of the transverse pipes are inserted into the left side of the connecting box, heat conducting fins are fixedly sleeved at the outer edges of the transverse pipes close to the center, the left side of the preheating cave body is fixedly connected with an air collecting box near the bottom, the left ends of a plurality of transverse pipes are inserted into the right side of the air collecting box, and an L-shaped pipe is inserted in the position, close to the center, of the top of the air collecting box and the position, close to the top, of the left side of the firing kiln.

Further, the left side of preheating cave body is close to bottom department and is pegged graft there is the inlet tube, the inlet tube top is close to right-hand member department fixedly connected with first valve, the left side of preheating cave body is close to bottom department and is pegged graft there is the outlet pipe, the outlet pipe is located the inlet tube bottom, just the outlet pipe top is close to right-hand member department fixedly connected with second valve, preheat cave body inner chamber bottom and be close to center department fixedly connected with protective housing, protective housing inner chamber bottom fixedly connected with first motor, protective housing top is close to center department fixedly connected with third bearing, the third bearing inner chamber runs through and is equipped with the connecting axle, connecting axle bottom and first motor power take off shaft fixedly connected with, connecting axle outside edge is close to top department fixedly connected with a plurality of first blade.

Further, the bottom of the air collecting box is close to a center, a fourth bearing is fixedly connected with, a threaded shaft penetrates through the inner cavity of the fourth bearing, a rotating plate is fixedly connected to the bottom end of the threaded shaft, a threaded pipe is sleeved on the outer edge of the threaded shaft close to the top end, the outer edge of the threaded shaft is close to the top end and is mutually meshed with the inner cavity of the threaded pipe, an arc-shaped block is fixedly connected to the top end of the threaded pipe, and the outer edge of the arc-shaped block is close to the top end and is mutually attached to the bottom end of the L-shaped pipe.

Further, the top of the inner cavity of the air collecting box is close to the left side and the right side and is fixedly connected with a limiting pipe, two inner cavities of the limiting pipe are movably connected with movable blocks, the tops of the movable blocks are fixedly connected with movable rods, and the tops of the movable rods penetrate through the inner cavities of the adjacent limiting pipes and are fixedly connected with the bottoms of the arc-shaped blocks.

Further, preheat the equal fixedly connected with riser in left and right sides that cave body top is close to, two riser top is fixedly connected with diaphragm jointly, two riser left and right sides is close to the equal fixedly connected with fifth bearing in top department, is located the right side fifth bearing inner chamber runs through and is equipped with first threaded rod, first threaded rod left end fixedly connected with second threaded rod, second threaded rod left end is pegged graft in adjacent fifth bearing inner chamber, and is located the right side riser right side is close to top department fixedly connected with second motor, second motor power take off shaft and first threaded rod right-hand member fixed connection.

Further, the diaphragm bottom is close to the left and right sides and all has the rectangle piece, two all seted up the screw hole on the rectangle piece, first threaded rod and second threaded rod outside edge all run through adjacent screw hole inner chamber, just first threaded rod and second threaded rod outside edge all set up for intermeshing with adjacent screw hole inner chamber, two the equal fixedly connected with slide bar in rectangle piece top, two the equal fixedly connected with slider in slide bar top, the spout has been seted up to the diaphragm bottom, two the slider all is located the spout inner chamber.

Further, the rectangular opening is formed in the position, close to the center, of the top of the preheating cave body, the rectangular opening inner cavity penetrates through the sealing plate, the linkage rod is hinged to the bottoms of the adjacent rectangular blocks on the left side and the right side of the top of the sealing plate, the connecting rods are fixedly connected to the bottoms of the sealing plate on the left side and the right side of the sealing plate, the heat conducting plates are fixedly connected to the bottoms of the connecting rods on the left side and the right side, the limiting blocks are fixedly connected to the left side and the right side of the heat conducting plates, limiting grooves are formed in the positions, close to the tops, of the left side and the right side of the inner cavity of the preheating cave body, and the limiting blocks are located in the inner cavities of the adjacent limiting grooves.

Compared with the prior art, the utility model has the beneficial effects that:

through mutually supporting between each part, can preheat mullite, compare traditional heating's mode, saved the loss to the electric energy, reduced manufacturing cost, more environmental protection, and preheat the back of accomplishing, be convenient for get mullite and put, improved the convenience of device operation, be favorable to improving work efficiency.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model, as well as the preferred embodiments thereof, together with the following detailed description of the utility model, given by way of illustration only, together with the accompanying drawings.

Drawings

Fig. 1 is a front view of the present embodiment;

fig. 2 is a component heat conduction fin of the present embodiment;

FIG. 3 is an enlarged view of FIG. 1 at A;

FIG. 4 is an enlarged view of FIG. 1 at B;

fig. 5 is an enlarged view of fig. 1 at C.

In the figure: 1. a base; 2. firing the kiln; 3. preheating a cave body; 4. a connection box; 5. a wind collecting box; 6. a transverse tube; 7. a heat conducting fin; 8. a protective box; 9. a first motor; 10. a first blade; 11. a second motor; 12. a first threaded rod; 13. a second threaded rod; 14. rectangular blocks; 15. a linkage rod; 16. a sealing plate; 17. a connecting rod; 18. a heat conductive plate; 19. a third motor; 20. a drive gear; 21. a driven gear; 22. a second blade; 23. a threaded shaft; 24. a rotating plate; 25. a threaded tube; 26. an arc-shaped block; 27. a slide bar; 28. a slide block; 29. and a limiting block.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-5, the present utility model provides a technical solution:

example 1:

the mullite preheating kiln comprises a base 1, a firing kiln 2 is fixedly connected to the top of the base 1 near the right side, a preheating cave body 3 is fixedly connected to the top of the base 1 near the left side, a connecting box 4 is fixedly connected to the right side of the preheating cave body 3 near the bottom, air inlet pipes are jointly inserted into the positions, near the bottom, of the right side of the connecting box 4, the right side of the inner cavity of the connecting box 4 is fixedly connected with a third motor 19 near the center, a fixing plate is fixedly connected to the positions, near the center, of the front side and the rear side of the inner cavity of the connecting box 4, a plurality of through holes are formed in the fixing plate, a first bearing is fixedly connected to the position, near the center, of the fixing plate, a rotating shaft is fixedly connected to a power output shaft of the third motor 19 in a penetrating manner, a driving gear 20 is fixedly connected to the left end of the rotating shaft, a second bearing is fixedly connected to the positions, near the front side and the rear side of the fixing plate, the inner cavities of the two second bearings are respectively inserted with a rotating rod, driven gears 21 are fixedly sleeved at the positions, close to the center, of the outer sides of the two rotating rods, the two driven gears 21 are mutually meshed with a driving gear 20, a plurality of second blades 22 are fixedly connected at the positions, close to the left ends, of the outer edges of the two rotating rods, of the preheating cavity body 3, a plurality of transverse pipes 6 are jointly penetrated and arranged at the positions, close to the bottom, of the preheating cavity body 3, the right ends of the plurality of transverse pipes 6 are respectively inserted at the left sides of the connecting box 4, heat conducting fins 7 are fixedly sleeved at the positions, close to the center, of the outer edges of the plurality of transverse pipes 6, of the preheating cavity body 3, a wind collecting box 5 is fixedly connected at the positions, close to the bottom, of the left ends of the plurality of transverse pipes 6 are respectively inserted at the positions, close to the center, of the top of the wind collecting box 5 and the firing kiln 2 are jointly inserted at the positions, close to the bottom, of the left sides of the preheating cavity body 3 are inserted with a water inlet pipe, the first valve is fixedly connected to the position, close to the right end, of the top of the water inlet pipe, the water outlet pipe is inserted into the position, close to the bottom, of the left side of the preheating cave body 3, the water outlet pipe is positioned at the bottom of the water inlet pipe, the second valve is fixedly connected to the position, close to the right end, of the top of the water outlet pipe, close to the center, of the bottom of the inner cavity of the preheating cave body 3, the protective box 8 is fixedly connected with the first motor 9, the third bearing is fixedly connected to the position, close to the center, of the top of the protective box 8, the third bearing inner cavity is penetrated with a connecting shaft, the bottom of the connecting shaft is fixedly connected with the power output shaft of the first motor 9, the outer edge, close to the top, of the connecting shaft is fixedly connected with a plurality of first blades 10, the position, close to the center, of the bottom of the air collecting box 5 is fixedly connected with the fourth bearing, the screw shaft 23 is fixedly connected with the rotating plate 24 at the bottom end of the screw shaft 23, the screw tube 25 is sleeved at the position, close to the top end, of the outer edge of the screw shaft 23, the position, close to the top end, of the screw shaft 23 is mutually meshed with the inner cavity of the screw tube 25, the top end of the screw tube 25 is fixedly connected with the arc-shaped block 26, the position, close to the top end, of the outer edge of the arc-shaped block 26 is mutually attached to the bottom end of the L-shaped tube, the limiting tubes are fixedly connected to the top of the inner cavity of the air collecting box 5 at the left side and the right side, the two limiting tube inner cavities are movably connected with the movable blocks, the tops of the two movable blocks are fixedly connected with the movable rods, and the tops of the two movable rods penetrate through the adjacent inner cavities of the limiting tubes and are fixedly connected with the bottom of the arc-shaped block 26;

through rotating the rotating plate 24, drive screw thread shaft 23 through the rotating plate 24 and rotate, drive screw thread pipe 25 through screw thread shaft 23 and move down, drive arc piece 26 through screw thread pipe 25 and move down, make arc piece 26 and L shape bottom separation, at this moment, through third motor 19, drive the pivot through third motor 19 power take off shaft and rotate, drive driving gear 20 through the pivot, drive driven gear 21 through driving gear 20 and rotate, drive adjacent bull stick through two driven gears 21 and rotate, drive adjacent second blade 22 through two bull sticks and rotate, can inhale a plurality of cross tube 6 inner chamber with the steam that fires kiln 2 inner chamber through a plurality of second blade 22 rotation, and circulate to firing kiln 2 inner chamber through L shape pipe, heat is when passing through cross tube 6, can pass through heat transfer to in the water through heat conduction fin 7, heat, through starting first motor 9, drive the axis rotation through first motor 9, drive a plurality of first blade 10 through the rotation of a plurality of first blade 10, drive water through a plurality of first blade 10 stirs, make water heating evenly, after the water heating and heat the heat conduction plate 18 carries out the heating, can place mullite at the top, thereby the electric energy is saved, the cost of heating has been reduced, the production is more environmental protection, and the cost has been compared to traditional.

Example 2:

the top of the preheating cave body 3 is close to the left side and the right side and is fixedly connected with risers, the tops of the two risers are fixedly connected with transverse plates, the positions of the left side and the right side of the two risers close to the tops are fixedly connected with fifth bearings, a first threaded rod 12 is arranged in the inner cavity of the fifth bearing in a penetrating way, the left end of the first threaded rod 12 is fixedly connected with a second threaded rod 13, the left end of the second threaded rod 13 is inserted into the inner cavity of the adjacent fifth bearing, the right side of the riser on the right side is close to the tops and is fixedly connected with a second motor 11, the power output shaft of the second motor 11 is fixedly connected with the right end of the first threaded rod 12, rectangular blocks 14 are arranged at the bottoms of the transverse plates close to the left side and the right side, threaded holes are formed in the two rectangular blocks 14, the outer edges of the first threaded rod 12 and the second threaded rod 13 penetrate through the inner cavities of the adjacent threaded holes, the outer edges of the first threaded rod 12 and the second threaded rod 13 are mutually meshed with the adjacent threaded hole inner cavities, sliding rods 27 are fixedly connected to the tops of the two rectangular blocks 14, sliding blocks 28 are fixedly connected to the tops of the two sliding rods 27, sliding grooves are formed in the bottoms of the transverse plates, the two sliding blocks 28 are located in the inner cavities of the sliding grooves, rectangular openings are formed in the positions, close to the center, of the tops of the preheating hole bodies 3, the inner cavities of the rectangular openings are penetrated by sealing plates 16, connecting rods 15 are hinged to the bottoms of the adjacent rectangular blocks 14 on the left side and the right side of the tops of the sealing plates 16, connecting rods 17 are fixedly connected to the bottoms of the two connecting rods 17 on the left side and the right side, heat conducting plates 18 are fixedly connected with limiting blocks 29, limiting grooves are formed in the positions, close to the tops, of the left side and the right side of the inner cavities of the preheating hole bodies 3, and the two limiting blocks 29 are located in the inner cavities of the adjacent limiting grooves;

after the preheating is finished, the first threaded rod 12 is driven to rotate through the second motor 11 by starting the second motor 11, the second threaded rod 13 is driven to rotate through the first threaded rod 12, the adjacent rectangular blocks 14 are driven to move to two sides through the first threaded rod 12 and the second threaded rod 13, the adjacent linkage rods 15 are driven to move to two sides through the two rectangular blocks 14, the sealing plate 16 is driven to move upwards through the two linkage rods 15 together, and accordingly the heat-conducting plate 18 can be driven to move upwards, mullite can be moved to the outer side of the preheating hole body 3, mullite can be conveniently taken and placed, convenience in device operation is improved, and work efficiency is improved.

Working principle: the utility model firstly drives the screw shaft 23 to rotate through the rotating plate 24, drives the screw tube 25 to move downwards through the screw shaft 23, drives the arc block 26 to move downwards through the screw tube 25, so that the arc block 26 is separated from the L-shaped bottom end, at the moment, the third motor 19 drives the rotating shaft to rotate through the power output shaft of the third motor 19, the driving gear 20 is driven to rotate through the rotating shaft, the driven gear 21 is driven to rotate through the driving gear 20, the two driven gears 21 drive the adjacent rotating rods to rotate, the two rotating rods drive the adjacent second blades 22 to rotate, the hot air in the inner cavity of the firing kiln 2 can be sucked into the inner cavity of the plurality of transverse tubes 6 through the rotation of the plurality of second blades 22, and is circulated to the inner cavity of the firing kiln 2 through the L-shaped tubes, the heat can be transferred into water through the heat conducting fins 7 when passing through the transverse tubes 6, the water is heated, the first motor 9 is started, the first motor 9 drives the linkage shaft to rotate, the linkage shaft drives the first blades 10 to rotate, the first blades 10 drive water to stir, so that the water is heated uniformly, the heat-conducting plate 18 is heated after the water is heated, mullite can be placed on the top of the heat-conducting plate 18, the mullite can be preheated, compared with the traditional heating mode, the loss of electric energy is saved, the production cost is reduced, the device is more environment-friendly, after the preheating is finished, the second motor 11 is started, the second motor 11 drives the first threaded rod 12 to rotate, the first threaded rod 12 drives the second threaded rod 13 to rotate, the first threaded rod 12 and the second threaded rod 13 drive the adjacent rectangular blocks 14 to move to two sides, the two rectangular blocks 14 drive the adjacent connecting rods 15 to move to two sides, the two connecting rods 15 jointly drive the sealing plate 16 to move upwards, thereby can drive the heat-conducting plate 18 and upwards remove for mullite removes to preheat the cave body 3 outside, thereby be convenient for get mullite put, improved the convenience of device operation, be favorable to improving work efficiency.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (7)

1. The utility model provides a mullite preheating kiln, includes base, its characterized in that: the baking kiln is fixedly connected to the position, close to the right, of the top of the base, the preheating cave body is fixedly connected to the position, close to the left, of the top of the base, the connecting box is fixedly connected to the position, close to the right, of the preheating cave body, the position, close to the bottom, of the right side of the connecting box, the position, close to the left, of the baking kiln is jointly spliced with an air inlet pipe, the position, close to the center, of the right side of the connecting box inner cavity is fixedly connected with a third motor, the position, close to the center, of the front and rear sides of the connecting box inner cavity is fixedly connected with a fixing plate, a plurality of through holes are formed in the fixing plate, a first bearing is fixedly connected to the position, close to the center, of the first bearing inner cavity is penetrated with a rotating shaft, the right end of the rotating shaft is fixedly connected with a power output shaft of the third motor, the left end of the rotating shaft is fixedly connected with a driving gear, the left side of the fixed plate is fixedly connected with second bearings near the front and rear sides, the inner cavities of the two second bearings are respectively inserted with a rotating rod, driven gears are fixedly sleeved at the positions, near the center, of the outer sides of the rotating rods, the driven gears and the driving gears are mutually meshed, a plurality of second blades are fixedly connected at the positions, near the left ends, of the outer edges of the two rotating rods, a plurality of transverse pipes are jointly penetrated at the positions, near the bottoms, of the left and right sides of the preheating cave body, the left ends of the transverse pipes are inserted in the right side of the air collecting box, the left edges of the outer sides of the transverse pipes are fixedly sleeved with heat conducting fins near the center, the left side of the preheating cave body is fixedly connected with an air collecting box near the bottom, the left ends of the transverse pipes are inserted in the right side of the air collecting box, and the top of the air collecting box is inserted with an L-shaped pipe near the center and near the top of the firing kiln.

2. A mullite preheating kiln as claimed in claim 1, wherein: the preheating cave body left side is close to bottom department and is pegged graft there is the inlet tube, the inlet tube top is close to the first valve of right-hand member department fixedly connected with, it has the outlet pipe to preheat cave body left side and is close to bottom department grafting, the outlet pipe is located the inlet tube bottom, just the outlet pipe top is close to right-hand member department fixedly connected with second valve, preheat cave body inner chamber bottom and be close to center department fixedly connected with protective housing, protective housing inner chamber bottom fixedly connected with first motor, protective housing top is close to center department fixedly connected with third bearing, the third bearing inner chamber runs through and is equipped with the connecting axle, connecting axle bottom and first motor power take off shaft fixedly connected with, connecting axle outside edge is close to top department fixedly connected with a plurality of first blade.

3. A mullite preheating kiln as claimed in claim 1, wherein: the air collecting box is characterized in that a fourth bearing is fixedly connected to the bottom of the air collecting box near the center, a threaded shaft penetrates through the inner cavity of the fourth bearing, a rotating plate is fixedly connected to the bottom end of the threaded shaft, a threaded pipe is sleeved on the outer edge of the threaded shaft near the top end, the outer edge of the threaded shaft near the top end and the inner cavity of the threaded pipe are mutually meshed, an arc-shaped block is fixedly connected to the top end of the threaded pipe, and the outer edge of the arc-shaped block near the top end and the bottom end of the L-shaped pipe are mutually attached.

4. A mullite preheating kiln according to claim 3 wherein: the top of the inner cavity of the air collecting box is close to the left side and the right side and is fixedly connected with a limiting pipe, two inner cavities of the limiting pipe are movably connected with movable blocks, the top of each movable block is fixedly connected with a movable rod, and the top of each movable rod penetrates through the inner cavities of the adjacent limiting pipes and is fixedly connected with the bottom of each arc-shaped block.

5. A mullite preheating kiln as claimed in claim 1, wherein: the utility model discloses a preheating cave body, including preheating cave body, riser, second motor power output shaft, first threaded rod, second threaded rod left end is pegged graft in adjacent fifth bearing inner chamber, and is located the right side riser right side is close to top department fixedly connected with second motor, second motor power output shaft and first threaded rod right-hand member fixed connection.

6. A mullite preheating kiln as defined in claim 5 wherein: the utility model discloses a cross bar, including the cross bar, the cross bar bottom is close to the left and right sides and all has the rectangle piece, two all offered the screw hole on the rectangle piece, first threaded rod and second threaded rod outside edge all run through adjacent screw hole inner chamber, just first threaded rod and second threaded rod outside edge all set up for intermeshing with adjacent screw hole inner chamber, two equal fixedly connected with slide bar in rectangle piece top, two equal fixedly connected with slider in slide bar top, the spout has been seted up to the cross bar bottom, two the slider all is located the spout inner chamber.

7. The mullite preheating kiln of claim 6 wherein: rectangular openings are formed in the top of the preheating cave body near the center, sealing plates penetrate through the rectangular opening inner cavities, linkage rods are hinged to the bottoms of adjacent rectangular blocks at the positions, close to the left side and the right side, of the top of each sealing plate, connecting rods are fixedly connected to the bottoms, close to the left side and the right side, of each sealing plate, heat conducting plates are fixedly connected to the bottoms of the connecting rods, limiting blocks are fixedly connected to the left side and the right side of each heat conducting plate, limiting grooves are formed in the positions, close to the tops, of the left side and the right side of the inner cavities of the preheating cave body, and the limiting blocks are located in the inner cavities of the adjacent limiting grooves.

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