Heating furnace capable of assisting in scraping materials

Abstract

The invention discloses a heating furnace capable of assisting in scraping, and relates to the technical field of heating furnaces, the heating furnace comprises a furnace body and a scraping mechanism, and a radiation heating pipe is mounted in the furnace body. According to the heating furnace capable of feeding the workpiece to the top of the rotating plate, enabling the bottom of the workpiece to make contact with the partition plate and then assisting in scraping, the workpiece is limited through the fixing mechanism and prevented from moving, after fixing is completed, the door plate can be pushed to drive the workpiece to enter the furnace body to be heated, and the motor is started to drive the rotating plate to rotate; after heating is completed, oxide scales on the surface of the workpiece in the furnace body need to be scraped, by starting a hydraulic rod a and a hydraulic rod b, the hydraulic rod a can drive a scraper a to move to the top of the workpiece, a connecting box can drive a scraping mechanism to move to the outer side of the workpiece, and when the workpiece rotates, the top of the workpiece makes contact with the scraper a; and the outer side is in contact with the scraping plate b, so that the oxide scale on the surface of the workpiece is completely scraped.

Description

Technical Field

[0001] The invention relates to the technical field of heating furnaces, in particular to a heating furnace capable of assisting in scraping materials. Background Art

[0002] A heating furnace is a device commonly used in industrial production. It generates high temperature by burning fuel or using electrical energy to heat workpieces or media. A heating furnace is usually composed of a furnace body, a combustion system, a heating source, and a control system. The furnace body provides a closed space for effective heat exchange.

[0003] For example, announcement number CN221071600 discloses a billet heating furnace with an oxidized iron scale scraping mechanism. The utility model scrapes off the oxidized iron scale of the billet through a scraper mechanism, and the oxidized iron scale enters the mesh frame through an inclined lower material plate to complete collection. The rapid ventilation of the cooling bottom frame is achieved through the cooperation of the inlet and outlet air bin vacuum pump and the inlet and outlet air ducts, thereby achieving rapid cooling of the oxidized iron scale, which is convenient for cleaning the oxidized iron scale. After cooling, the oxidized iron scale can be quickly processed by pulling out the mesh frame, which is convenient and quick to use.

[0004] The heating furnace in the above scheme will cause iron oxide scale to be generated on the surface of the workpiece when heating the workpiece. In order to scrape off the iron oxide scale, the threaded rod and the scraper are driven by the starting motor to perform threaded transmission, so that the scraper moves and contacts the workpiece to scrape off the iron oxide scale on the surface of the workpiece. However, this cleaning method can only scrape off the iron oxide scale on both sides of the workpiece, and cannot scrape off the top of the workpiece and the other two sides of the workpiece. In addition, the workpiece is not limited and is prone to move when scraping off the iron oxide scale. Summary of the invention

[0005] The object of the present invention is to provide a heating furnace capable of assisting scraping, so as to solve the problem that the existing heating furnaces mentioned in the background art are difficult to scrape off the iron oxide scale on the surface of the workpiece.

[0006] To achieve the above object, the present invention provides the following technical solution: a heating furnace capable of assisting scraping, comprising a furnace body and a scraping mechanism, wherein a radiation heating tube is installed inside the furnace body, and a door panel is slidably connected to one side of the furnace body.

[0007] A connecting plate a is fixedly connected to one side of the door panel, a rotating plate is provided on the top of the connecting plate a, a plurality of groups of limit blocks a are fixedly connected to the bottom of the rotating plate, the bottom and the outer side of the limit blocks a are rollingly connected with balls, a motor is installed at the bottom of the furnace body, a rectangular block is fixedly connected to the top of the motor, a fixing mechanism for fixing the workpiece is provided inside the rotating plate, a plurality of groups of partitions are fixedly connected at the center of the interior of the furnace body, a hydraulic rod a is installed on the top of the furnace body, a scraper a is fixedly connected to the bottom of the hydraulic rod a, a connecting box is fixedly connected to one side of the furnace body, a hydraulic rod b is installed inside the connecting box, a scraper mechanism for scraping off the oxide scale on the surface of the workpiece is provided at one end of the hydraulic rod b, the scraper mechanism includes a connecting plate b fixedly connected to the hydraulic rod b, and a sliding rod a is slidably connected inside the connecting plate b.

[0008] Preferably, one end of the sliding rod a is fixedly connected to a fixing plate, a spring a is sleeved on the outer side of the sliding rod a, and one end of the spring a is in contact with the connecting plate b.

[0009] Preferably, the other end of the spring a abuts against the fixed plate, the interior of the fixed plate is fixedly connected with a limiting rod, the outer side of the limiting rod is slidably connected with a fixed block, one side of the fixed block abuts against a spring b, and one end of the spring b abuts against the fixed plate.

[0010] Preferably, a scraper b is fixedly connected to one side of the fixed block, the bottom of the scraper b is movably connected to a roller via a rotating shaft, and a plurality of groups of arc blocks are fixedly connected to the top of the rotating plate, and the plurality of groups of arc blocks are distributed at equal angles with respect to the center line of the gear ring.

[0011] Preferably, multiple groups of the limit blocks a are distributed at equal angles with respect to the central axis of the gear ring, the outer sides of the limit blocks a are slidably connected to the connecting plate a, the bottom of the rotating plate is provided with a rectangular groove matching the rectangular block, and the bottom of the connecting plate a is provided with a sliding groove matching the motor output shaft.

[0012] Preferably, the fixing mechanism includes a threaded rod movably connected to the inside of the rotating plate through a bearing, the outer side of the threaded rod is threadedly connected to a rack rod, the outer side of the rack rod is slidingly connected to the rotating plate, and one side of the rotating plate is meshingly connected to a gear ring.

[0013] Preferably, the inner side of the gear ring is meshingly connected with a gear body, the bottom of the gear body is slidably connected to the rotating plate via a rotating shaft, one side of the gear body is fixedly connected to a limiting plate, and the limiting plate has an arc shape.

[0014] Preferably, a slide bar b is fixedly connected to the inside of the rotating plate, a moving block is slidably connected to the outside of the slide bar b, a steel wire rope is fixedly connected to one side of the moving block, and a pulley is wound around the outside of the steel wire rope.

[0015] Preferably, both sides of the pulley are slidably connected to the rotating plate through a rotating shaft, one end of the wire rope is fixedly connected to a push plate, one side of the push plate is fixedly connected to multiple groups of springs c, one end of the spring c is fixedly connected to the rotating plate, and an inclined groove is provided on the side of the rotating plate away from the pulley.

[0016] Preferably, the side of the rotating plate close to the inclined slot is movably connected to a closing plate via a rotating shaft, a limiting block b is provided on one side of the bottom of the closing plate, and one side of the limiting block b is movably connected to the furnace body via a damping rotating shaft.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The scraping-assisted heating furnace, when heating the workpiece, feeds the workpiece to the top of the rotating plate so that the bottom of the workpiece contacts the partition, and then limits the workpiece through the fixing mechanism to prevent it from moving. After the fixing is completed, the door panel can be pushed to drive the workpiece into the furnace body for heating, and the motor is started to drive the rotating plate to rotate to heat the workpiece evenly. After the heating is completed, the oxidized iron scale on the surface of the workpiece in the furnace body needs to be scraped off. By starting the hydraulic rod a and the hydraulic rod b, the hydraulic rod a will drive the scraper a to the top of the workpiece, and the connecting box will drive the scraper mechanism to the outside of the workpiece. When the workpiece rotates, the top will contact the scraper a, and the outside will contact the scraper b, so that the oxidized iron scale on the surface of the workpiece is scraped off. In this way, through the above operation, the workpiece in the heating furnace can be evenly heated, and the oxidized iron scale generated when the workpiece is heated can be scraped off.

[0019] 2. In the heating furnace capable of assisting scraping, after the iron oxide scale on the outside of the workpiece is scraped off, the iron oxide scale will fall into the inside of the rotating plate through the gaps of the multiple groups of partitions. When the heating of the workpiece is completed, the door panel and the connecting plate a will be pulled out. At this time, the rectangular block will gradually break away from the squeezing of the moving block. The spring c will reset and push the push plate at one end to move inside the rotating plate, pushing the iron oxide scale inside the rotating plate to the inclined groove on one side. When the iron oxide scale contacts the inclined groove, it will slide and gather on one side of the closed plate. When the iron oxide scale needs to be cleaned, the limit block b can be rotated to break away from the limit on the closed plate. At this time, the closed plate can be rotated to open and the iron oxide flakes inside the rotating plate can be discharged. In this way, the iron oxide flakes can be collected for easy cleaning. In this way, the iron oxide scale cleaned up in the heating furnace can be gathered through the above operation, which is convenient for subsequent centralized cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a three-dimensional cross-sectional schematic diagram of the present invention;

[0021] Figure 2 It is a three-dimensional schematic diagram of the present invention;

[0022] Figure 3 It is a three-dimensional cross-sectional schematic diagram of the rotating plate of the present invention;

[0023] Figure 4 It is a three-dimensional cross-sectional schematic diagram of the connection plate of the present invention;

[0024] Figure 5 It is a three-dimensional schematic diagram of the arc block of the present invention;

[0025] Figure 6 It is a three-dimensional schematic diagram of the scraping mechanism of the present invention.

[0026] In the figure: 1, furnace body; 2, radiation heating tube; 3, door panel; 4, connecting plate a; 5, stopper a; 6, ball bearing; 7, motor; 8, rectangular block; 9, rotating plate; 10, fixing mechanism; 101, threaded rod; 102, rack rod; 103, gear ring; 104, gear body; 105, stopper plate; 11, partition; 12, hydraulic rod a; 13, scraper a; 14, connecting box; 15, hydraulic rod b; 16, scraper Material mechanism; 161, connecting plate b; 162, sliding rod a; 163, spring a; 164, fixed plate; 165, limiting rod; 166, spring b; 167, fixed block; 168, scraper b; 169, arc block; 1610, roller; 17, sliding rod b; 18, moving block; 19, wire rope; 20, pulley; 21, push plate; 22, spring c; 23, inclined groove; 24, closing plate; 25, limiting block b. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 6 The present invention provides a technical solution: a heating furnace capable of assisting scraping, comprising a furnace body 1 and a scraping mechanism 16, wherein a radiation heating tube 2 is installed inside the furnace body 1, and a door panel 3 is slidably connected to one side of the furnace body 1.

[0029] A connecting plate a4 is fixedly connected to one side of the door panel 3, a rotating plate 9 is arranged on the top of the connecting plate a4, a plurality of groups of limit blocks a5 are fixedly connected to the bottom of the rotating plate 9, a ball 6 is rollingly connected to the bottom and the outer side of the limit block a5, a motor 7 is installed at the bottom of the furnace body 1, a rectangular block 8 is fixedly connected to the top of the motor 7, a fixing mechanism 10 for fixing the workpiece is arranged inside the rotating plate 9, a plurality of groups of partitions 11 are fixedly connected at the center of the interior of the furnace body 1, a hydraulic rod a12 is installed on the top of the furnace body 1, a scraper a13 is fixedly connected to the bottom of the hydraulic rod a12, a connecting box 14 is fixedly connected to one side of the furnace body 1, a hydraulic rod b15 is installed inside the connecting box 14, a scraper mechanism 16 for scraping off the oxidized iron scale on the surface of the workpiece is arranged at one end of the hydraulic rod b15, the scraper mechanism 16 includes a connecting plate b161 fixedly connected to the hydraulic rod b15, and a sliding rod a162 is slidably connected inside the connecting plate b161;

[0030] One end of the slide bar a162 is fixedly connected to a fixed plate 164, a spring a163 is sleeved on the outer side of the slide bar a162, one end of the spring a163 abuts against the connecting plate b161; the other end of the spring a163 abuts against the fixed plate 164, the interior of the fixed plate 164 is fixedly connected to a limiting rod 165, the outer side of the limiting rod 165 is slidably connected to a fixed block 167, one side of the fixed block 167 abuts against a spring b166, one end of the spring b166 abuts against the fixed plate 164; A scraper b168 is fixedly connected to one side of the fixed block 167, and a roller 1610 is movably connected to the bottom of the scraper b168 through a rotating shaft. A plurality of arc blocks 169 are fixedly connected to the top of the rotating plate 9, and the plurality of arc blocks 169 are distributed at equal angles with respect to the center line of the gear ring 103. A through groove matching the slide rod a162 is provided inside the connecting plate b161, and the connecting plate b161 and the slide rod a162 form a sliding structure; a plurality of limit blocks a5 are distributed at equal angles with respect to the center axis of the gear ring 103. The outer side of the limit block a5 is slidably connected with the connecting plate a4, the bottom of the rotating plate 9 is provided with a rectangular groove matching the rectangular block 8, the bottom of the connecting plate a4 is provided with a sliding groove matching the output shaft of the motor 7, the inside of the connecting plate a4 is provided with an annular groove matching the limit block a5, and the limit block a5 and the connecting plate a4 constitute a sliding structure; the fixing mechanism 10 includes a threaded rod 101 movably connected to the inside of the rotating plate 9 through a bearing, and the outer side of the threaded rod 101 is threadedly connected with a rack rod 10 2. The outer side of the rack rod 102 is slidably connected to the rotating plate 9, and one side of the rotating plate 9 is meshedly connected with a gear ring 103; the inner side of the gear ring 103 is meshedly connected with a gear body 104, and the bottom of the gear body 104 is slidably connected to the rotating plate 9 through a rotating shaft, and one side of the gear body 104 is fixedly connected to a limit plate 105, and the shape of the limit plate 105 is arc-shaped. The rack rod 102 and the gear ring 103 constitute a meshing transmission structure, and the threaded rod 101 and the rack rod 102 constitute a threaded transmission structure.

[0031] In a specific implementation, the scraper-assisted heating furnace, when heating the workpiece, feeds the workpiece to the top of the rotating plate 9 so that the bottom of the workpiece contacts the partition plate 11, and then rotates the threaded rod 101 to perform threaded transmission with the rack rod 102, driving the rack rod 102 to move, and when the rack rod 102 moves, it will mesh with the gear ring 103 on one side, thereby driving the gear ring 103 to rotate, and the inner side of the gear ring 103 will mesh with the multiple sets of gear bodies 104, thereby driving the multiple sets of gear bodies 104 and the outer limit plates 105 to rotate, and the multiple sets of gear bodies 104 and the outer limit plates 105 are rotated. When the limiting plate 105 rotates and contacts the workpiece, it will push the workpiece to make it at the center of the rotating plate 9, and limit the workpiece to prevent it from moving. After the fixing is completed, the door panel 3 can be pushed to drive the connecting plate a4 and the rotating plate 9 to move, and the rotating plate 9 and the workpiece can be sent into the furnace body 1 for heating. When the door panel 3 is completely closed, the rectangular groove in the rotating plate 9 will be engaged with the rotating plate 9, and the center point of the rotating plate 9 will be on the central axis of the output shaft of the motor 7. The motor 7 can be started to drive the rotating plate 9 to rotate, so as to heat the workpiece evenly.

[0032] After heating is completed, the oxidized iron scale on the surface of the workpiece in the furnace body 1 needs to be scraped off. By starting the hydraulic rod a12 and the hydraulic rod b15, the hydraulic rod a12 will drive the scraper a13 to move to the top of the workpiece, and the connecting box 14 will drive the scraper b168 in the scraper mechanism 16 to move to the outside of the workpiece. When the workpiece rotates, the top will contact the scraper a13, so that the oxidized iron scale on the top will be scraped off, and the outside of the workpiece will contact the scraper b168. When the workpiece is rectangular, the corners of the workpiece will squeeze the scraper b168 to move. When the scraper b168 moves, it will squeeze the spring a163 on one side through the fixed plate 164 to adapt to the shape of the workpiece and rotate. When the movable plate 9 rotates, it will drive the arc block 169 on the top to contact the roller 1610 at the bottom of the scraper b168, thereby driving the scraper b168 to move upward. When the scraper b168 moves, it will drive the fixed block 167 to squeeze the spring b166. When the roller 1610 is out of contact with the arc block 169, the spring b166 will push the scraper b168 to move downward. In this way, the scraper b168 can move back and forth up and down when the workpiece rotates, increasing the friction with the surface of the workpiece, thereby scraping off the iron oxide on the surface of the workpiece. Through the above operation, the workpiece in the heating furnace can be evenly heated, and the iron oxide generated when the workpiece is heated can be scraped off.

[0033] See also Figure 3-Figure 5, the interior of the rotating plate 9 is fixedly connected with a slide bar b17, the outer side of the slide bar b17 is slidably connected with a moving block 18, one side of the moving block 18 is fixedly connected with a wire rope 19, and a pulley 20 is wound around the outer side of the wire rope 19; both sides of the pulley 20 are slidably connected to the rotating plate 9 through a rotating shaft, one end of the wire rope 19 is fixedly connected with a push plate 21, one side of the push plate 21 is fixedly connected with multiple groups of springs c22, one end of the spring c22 is fixedly connected to the rotating plate 9, and a chute 23 is provided on the side of the rotating plate 9 away from the pulley 20; the side of the rotating plate 9 close to the chute 23 is movably connected with a closing plate 24 through a rotating shaft, a limiting block b25 is provided on one side of the bottom of the closing plate 24, and one side of the limiting block b25 is movably connected to the furnace body 1 through a damping rotating shaft, a moving groove matching the slide bar b17 is provided inside the moving block 18, the slide bar b17 and the moving block 18 constitute a sliding structure, and the pulley 20 constitutes a rotating structure with the rotating plate 9 through the rotating shaft.

[0034] In specific implementation, the scraping-assisted heating furnace, after the iron oxide scale on the outside of the workpiece is scraped off, the iron oxide scale will fall into the inside of the rotating plate 9 through the gaps of the multiple groups of partitions 11. When the workpiece is heated, the door panel 3 and the connecting plate a4 will be pulled out. At this time, the rectangular block 8 will gradually break away from the squeeze on the moving block 18, and the spring c22 will reset and push the push plate 21 at one end to move inside the rotating plate 9, pushing the iron oxide scale inside the rotating plate 9 to the inclined groove 23 on one side. When the iron oxide scale contacts the inclined groove 23, it will slide down and gather on one side of the closing plate 24. When the iron oxide scale needs to be cleaned, the rotatable limit block b25 can be disengaged from the limit on the closing plate 24. At this time, the closing plate 24 can be rotated to open the rotating plate 9. The iron oxide flakes inside the movable plate 9 are discharged, so that the iron oxide flakes can be collected for easy cleaning. When the rotating plate 9 moves into the furnace body 1, the rectangular block 8 will squeeze the moving block 18 to move the moving block 18. When the moving block 18 moves, it will pull the wire rope 19 to move. The wire rope 19 changes direction through the pulley 20 and pulls the push plate 21 to move. The push plate 21 will squeeze the spring c22 on one side to contract. When the rotating plate 9 completely enters the furnace body 1, the push plate 21 will move to the side away from the closing plate 24 to push and collect the subsequent cleaned iron oxide sheets. In this way, the iron oxide sheets cleaned in the heating furnace can be gathered through the above operation, which is convenient for subsequent centralized cleaning.

[0035] In summary, by fixing the workpiece to the connecting plate a4, then feeding it into the furnace body 1, and starting the radiation heating tube 2, the radiation heating tube 2 will heat the workpiece. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heating furnace capable of assisting scraping, comprising a furnace body (1) and a scraping mechanism (16), wherein a radiation heating tube (2) is installed inside the furnace body (1), and a door panel (3) is slidably connected to one side of the furnace body (1), characterized in that: A connecting plate a (4) is fixedly connected to one side of the door panel (3), a rotating plate (9) is arranged on the top of the connecting plate a (4), a plurality of groups of limit blocks a (5) are fixedly connected to the bottom of the rotating plate (9), a ball (6) is rollingly connected to the bottom and the outer side of the limit blocks a (5), a motor (7) is installed at the bottom of the furnace body (1), a rectangular block (8) is fixedly connected to the top of the motor (7), a fixing mechanism (10) for fixing a workpiece is arranged inside the rotating plate (9), a plurality of groups of partitions (11) are fixedly connected at the center of the inside of the furnace body (1), A hydraulic rod a (12) is installed on the top of the furnace body (1), and a scraper a (13) is fixedly connected to the bottom of the hydraulic rod a (12). A connection box (14) is fixedly connected to one side of the furnace body (1), and a hydraulic rod b (15) is installed inside the connection box (14). A scraper mechanism (16) for scraping off iron oxide scale on the surface of a workpiece is arranged at one end of the hydraulic rod b (15), and the scraper mechanism (16) includes a connection plate b (161) fixedly connected to the hydraulic rod b (15), and a sliding rod a (162) is slidably connected inside the connection plate b (161).

2. A heating furnace capable of assisting scraping according to claim 1, characterized in that: One end of the slide bar a (162) is fixedly connected to a fixing plate (164), a spring a (163) is sleeved on the outer side of the slide bar a (162), and one end of the spring a (163) is in contact with the connecting plate b (161).

3. A heating furnace capable of assisting scraping according to claim 2, characterized in that: The other end of the spring a (163) is in contact with the fixed plate (164); a limiting rod (165) is fixedly connected inside the fixed plate (164); a fixing block (167) is slidably connected to the outside of the limiting rod (165); a spring b (166) is in contact with one side of the fixing block (167); and one end of the spring b (166) is in contact with the fixed plate (164).

4. A heating furnace capable of assisting scraping according to claim 3, characterized in that: A scraper b (168) is fixedly connected to one side of the fixed block (167), and a roller (1610) is movably connected to the bottom of the scraper b (168) via a rotating shaft. A plurality of groups of arc blocks (169) are fixedly connected to the top of the rotating plate (9), and the plurality of groups of arc blocks (169) are distributed at equal angles with respect to the center line of the gear ring (103).

5. The scraping-assisted heating furnace according to claim 1, characterized in that: A plurality of groups of the limit blocks a (5) are distributed at equal angles with respect to the central axis of the gear ring (103); the outer sides of the limit blocks a (5) are slidably connected to the connecting plate a (4); a rectangular groove matching the rectangular block (8) is provided at the bottom of the rotating plate (9); and a sliding groove matching the output shaft of the motor (7) is provided at the bottom of the connecting plate a (4).

6. The scraping-assisted heating furnace according to claim 1, characterized in that: The fixing mechanism (10) comprises a threaded rod (101) movably connected to the inside of a rotating plate (9) via a bearing, the outer side of the threaded rod (101) is threadedly connected to a rack rod (102), the outer side of the rack rod (102) is slidably connected to the rotating plate (9), and one side of the rotating plate (9) is meshingly connected to a gear ring (103).

7. A scraping-assisted heating furnace according to claim 6, characterized in that: The inner side of the gear ring (103) is meshedly connected with a gear body (104); the bottom of the gear body (104) is slidably connected to the rotating plate (9) via a rotating shaft; one side of the gear body (104) is fixedly connected to a limiting plate (105); and the limiting plate (105) has an arc shape.

8. The scraping-assisted heating furnace according to claim 1, characterized in that: The interior of the rotating plate (9) is fixedly connected to a sliding rod b (17), the outer side of the sliding rod b (17) is slidably connected to a moving block (18), one side of the moving block (18) is fixedly connected to a steel wire rope (19), and the outer side of the steel wire rope (19) is wound with a pulley (20).

9. A heating furnace capable of assisting scraping according to claim 8, characterized in that: Both sides of the pulley (20) are slidably connected to the rotating plate (9) via a rotating shaft, one end of the steel wire rope (19) is fixedly connected to a push plate (21), one side of the push plate (21) is fixedly connected to a plurality of groups of springs c (22), one end of the spring c (22) is fixedly connected to the rotating plate (9), and a slanted groove (23) is provided on a side of the rotating plate (9) away from the pulley (20).

10. A heating furnace capable of assisting scraping according to claim 9, characterized in that: A side of the rotating plate (9) close to the inclined groove (23) is movably connected to a closing plate (24) via a rotating shaft, a limiting block b (25) is provided on one side of the bottom of the closing plate (24), and one side of the limiting block b (25) is movably connected to the furnace body (1) via a damping rotating shaft.

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