Protective oriented silicon steel cover type annealing furnace and method

Abstract

The invention relates to the technical field of cover-type annealing furnaces, and discloses a protective oriented silicon steel cover-type annealing furnace and a method, the oriented silicon steel cover-type annealing furnace comprises a cover-type annealing furnace body, a plurality of groups of diameter-following spraying assisting mechanisms are arranged in the cover-type annealing furnace body, and each diameter-following spraying assisting mechanism comprises an internal adjusting furnace body, a push-out part and a gas spraying part; the air injection part is composed of a plurality of inner leaning arms which are equidistantly distributed along the inner circumference of the inner adjusting furnace body, and an air injection head array is arranged on the side, close to the furnace center, of each inner leaning arm; a double-adjusting component force ring is arranged on the outer wall of the inner adjusting furnace body, the inner circumference is connected with a push-out piece, and the outer circumference is connected with a driving mechanism; the intelligent module controls the driving mechanism to operate based on the diameter of the steel strip coil, the corresponding adjusting component force rings are driven to rotate and shift, and the push-out piece pushes the inner leaning arm set to radially shift to the set distance. High adaptability to steel strip coils with different diameters is achieved through the diameter-following spraying assisting mechanism, the intelligent module accurately controls the driving mechanism to operate, the double-adjusting component force ring is made to rotate and shift, and the push-out piece pushes the inner leaning arm set to move to the set distance matched with the steel strip coils in the radial direction.

Description

Technical Field

[0001] The present invention relates to the field of bell-type annealing furnaces, and more specifically, to a protective grain-oriented silicon steel bell-type annealing furnace and method. Background Art

[0002] A grain-oriented silicon steel bell-type annealing furnace is a device used for the heat treatment of grain-oriented silicon steel. By means of three steps of heating, heat preservation and cooling, the structure and properties of the metal are changed. In the heating stage, the furnace body raises the temperature to a predetermined temperature by burning fuel or electric heating and maintains it for a period of time to make the temperature inside the workpiece uniform. In the heat preservation stage, the set temperature is maintained to cause changes in the internal structure of the workpiece to achieve the desired annealing effect. In the cooling stage, the furnace temperature is gradually reduced to room temperature to avoid thermal cracking or other defects of the workpiece.

[0003] Traditional bell-type annealing furnaces mostly adopt a fixed spray distance design, resulting in a significant difference in heat exchange efficiency between the edge and the central region (the temperature difference often reaches 15 - 25 °C), which easily leads to uneven grain size (fluctuation ≥ 5 μm) and deviation in the thickness of the oxide layer (CV value ≥ 15%). For this reason, we propose a protective grain-oriented silicon steel bell-type annealing furnace and method. Summary of the Invention

[0004] The present invention provides a protective grain-oriented silicon steel bell-type annealing furnace and method, which solve the technical problems in the related art that there is a significant difference in heat exchange efficiency between the edge and the central region, and it is easy to cause uneven grain size and deviation in the thickness of the oxide layer.

[0005] The first aspect of the present invention provides a protective grain-oriented silicon steel bell-type annealing furnace, including: a bell-type annealing furnace body, which is internally provided with a plurality of diameter-dependent auxiliary spraying mechanisms. The diameter-dependent auxiliary spraying mechanism includes an inner adjusting furnace body, a pushing member and a gas spraying member;

[0006] The gas spraying member is composed of a plurality of inner supporting arms evenly distributed along the inner circumference of the inner adjusting furnace body, and a gas spraying head array is arranged on the side of each inner supporting arm close to the furnace center;

[0007] A double-adjusting force dividing ring is arranged on the outer wall of the inner adjusting furnace body, its inner circumference is connected to the pushing member, and its outer circumference is connected to a driving mechanism;

[0008] The intelligent module controls the operation of the driving mechanism based on the diameter of the steel strip coil, drives the corresponding adjusting force dividing ring to rotate and displace, and pushes the inner supporting arm group to radially displace to a set distance through the pushing member;

[0009] The mixed gas sprayed by the gas spraying heads directly hits the surface of the steel strip coil, and the gases sprayed by adjacent inner supporting arms form a left-right flow and generate a counter-jet on the surface of the coil, and finally a circumferential swirling air flow field is constructed to achieve uniform heat exchange and oxide layer control.

[0010] Further, the double-adjusting force dividing ring includes a first adjusting force dividing ring and a second adjusting force dividing ring. Both the first adjusting force dividing ring and the second adjusting force dividing ring are rotatably connected to the outer wall of the inner adjusting furnace body, and they are parallel to each other.

[0011] Further, the driving mechanism includes an outer protective cover fixed on the outside of the bell-type annealing furnace body. A plurality of power components are fixedly arranged inside the outer protective cover. Each group of power components corresponds to a group of diameter-following auxiliary spraying mechanisms. Each group of power components includes a control push rod one and a control push rod two. Both the control push rod one and the control push rod two are controlled by the intelligent module.

[0012] Further, a counterclockwise pulling rope is fixedly connected to the telescopic arm of the control push rod one, and a clockwise pulling rope is fixedly connected to the telescopic arm of the control push rod two. The other end of the counterclockwise pulling rope is fixedly connected to the outer circumference of the second adjusting force dividing ring, and the other end of the clockwise pulling rope is fixedly connected to the outer circumference of the first adjusting force dividing ring.

[0013] Further, the pushing member includes a limit seat. The limit seat is slidably connected to the inner supporting arm and is located inside the inner supporting arm. At the same time, the limit seat is fixedly connected to the inner wall of the inner adjusting furnace body.

[0014] Further, a main support frame is fixedly arranged at the central position of the limit seat. A main screw rod rotatably connected to it is passed through the central position of the main support frame. A belt pulley is fixedly arranged at one end of the main screw rod close to the main support frame.

[0015] Further, the belt pulley is provided with two belt grooves, and a coiling belt is fixedly arranged in each belt groove. The coiling directions of the two coiling belts in different belt grooves are opposite, and the ends of the two coiling belts far from the belt pulley are respectively fixedly connected to the corresponding double-adjusting force dividing rings to control the forward and reverse rotation of the main screw rod.

[0016] Further, a sliding push block one is movably arranged on the main screw rod. A main push arm column is fixedly arranged on the sliding push block one. One end of the main push arm column far from the sliding push block one is fixedly connected to the inner supporting arm. Sliding push blocks two are arranged on both sides of the main screw rod. A limiting column and a guiding column are cross-passed through the inside of the sliding push block two. A secondary push arm column is fixedly arranged on the sliding push block two. And a universal ball is arranged at one end of the secondary push arm column far from the sliding push block two. And the universal ball is slidably connected to the inner supporting arm.

[0017] Further, a surrounding air supply pipe is fixedly arranged on the outer wall of the inner adjusting furnace body. The air inlet end of the surrounding air supply pipe is connected to an air supply main pipe. The air outlet end of the surrounding air supply pipe is connected to a telescopic air pipe. And the telescopic air pipe is connected to the jet head array and is communicated with each other. A sensor is also arranged on the side wall of the inner supporting arm and is connected to the intelligent module.

[0018] In the second aspect of the present invention, a method for a bell-type annealing furnace for grain-oriented silicon steel is provided, including the following steps:

[0019] S1. Vertically lift the bell-type annealing furnace body by a hoisting device. After placing multiple oriented silicon steel strip coils on the annealing furnace base, re-cover the furnace body and the base to form a sealed chamber;

[0020] S2. Receive the diameter parameter of the strip coil through the intelligent module, control the first push rod to extend and the second push rod to retract, so that the counterclockwise pulling rope drives the second adjusting force dividing ring to rotate counterclockwise, and at the same time the clockwise pulling rope releases to drive the first adjusting force dividing ring to rotate clockwise;

[0021] S3. Drive the main screw to rotate through the double-adjusting force dividing ring linkage pulley, push the sliding block to drive the inner arm group to radially approach the surface of the strip coil synchronously through the push arm main column, and start the main gas supply pipe to supply the mixed gas to the jet head array through the surrounding gas supply pipe and the telescopic gas pipe;

[0022] S4. Real-time monitor the cyclone data between adjacent inner arms through the sensor, feedback to the intelligent module to dynamically adjust the strokes of the first control push rod and the second control push rod, so that the jet airflow forms a left-right flowing countercurrent on the surface of the strip coil, and constructs a circumferential swirling airflow field;

[0023] S5. After completing the annealing process, reversely drive the main screw to drive the inner arm group to reset, close the gas supply system and lift the bell-type annealing furnace body.

[0024] The beneficial effects of the present invention are as follows:

[0025] Through the unique diameter-following spray-assisting mechanism, the present invention realizes the height adaptability to strip coils of different diameters. The intelligent module precisely controls the operation of the driving mechanism, enables the double-adjusting force dividing ring to rotate and displace, and then drives the inner arm group to radially displace to the set spacing matching the strip coil through the pushing member. This process ensures that the jet head array can be flexibly adjusted according to the actual size of the strip coil, avoiding problems such as insufficient heat exchange or excessive oxidation caused by improper spacing;

[0026] During the annealing process, the mixed gas sprayed by the jet head directly hits the surface of the strip coil, and the gas ejected from adjacent inner arms forms a left-right flow and generates a countercurrent, constructing a circumferential swirling airflow field. Such an airflow organization method greatly enhances the uniformity of heat exchange, enables each part of the strip coil to be uniformly heated, effectively reduces the temperature difference, and then improves the annealing quality, ensures the consistency of the properties of the oriented silicon steel, and provides a strong guarantee for the production of high-quality oriented silicon steel. Description of the Drawings

[0027] Figure 1 is the overall structural schematic diagram of the present invention;

[0028] Figure 2 is the internal structural schematic diagram of the outer protection cover of the present invention;

[0029] Figure 3It is a schematic diagram of the internal structure of the bell-type annealing furnace body of the present invention;

[0030] Figure 4 It is a schematic top view structure diagram of the internal adjustment furnace body of the present invention;

[0031] Figure 5 It is a schematic structure diagram of the internal adjustment furnace body of the present invention;

[0032] Figure 6 It is a schematic right view structure diagram of the inner support arm of the present invention;

[0033] Figure 7 It is a schematic structure diagram of the initial state of the main column of the push arm of the present invention;

[0034] Figure 8 It is a schematic structure diagram of the extended state of the main column of the push arm of the present invention.

[0035] In the figure: 11, bell-type annealing furnace body; 2, diameter-following auxiliary spraying mechanism; 21, main gas supply pipe; 22, internal adjustment furnace body; 23, adjusting force dividing ring one; 24, adjusting force dividing ring two; 25, surrounding gas supply pipe; 26, clockwise pulling rope; 27, counterclockwise pulling rope; 3, driving mechanism; 31, outer protection cover; 32, control push rod one; 33, control push rod two; 41, inner support arm; 42, limit seat; 43, jet head; 44, telescopic air pipe; 45, main support frame; 46, belt pulley; 47, winding belt; 48, main screw rod; 49, sliding block one; 401, main column of the push arm; 402, sliding block two; 403, limit column; 404, auxiliary column of the push arm; 405, universal ball; 406, guiding column; 51, sensor. Detailed implementation manners

[0036] Now, the subject matter described herein will be discussed with reference to example embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein, and the functions and arrangements of the elements discussed can be changed without departing from the scope of protection of the content of this specification. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0037] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, a protective grain-oriented silicon steel bell-type annealing furnace includes: a bell-type annealing furnace body 11, inside which there are multiple groups of diameter-following auxiliary spraying mechanisms 2, and the diameter-following auxiliary spraying mechanism 2 includes an internal adjustment furnace body 22, a pushing member, and a jetting member;

[0038] The jetting member is composed of a plurality of inner support arms 41 evenly distributed at equal intervals along the inner circumference of the internal adjustment furnace body 22, and an array of jet heads 43 is arranged on the side of each inner support arm 41 close to the furnace core;

[0039] The outer wall of the inner adjusting furnace body 22 is provided with a double-adjusting force dividing ring, the inner circumference of which is connected to a pushing member and the outer circumference is connected to a driving mechanism 3;

[0040] Based on the diameter of the steel strip coil, the intelligent module controls the operation of the driving mechanism 3, driving the corresponding adjusting force dividing ring to rotate and displace, and pushing the inner supporting arm 41 group to radially displace to the set distance through the pushing member;

[0041] The mixed gas ejected by the jet head 43 directly hits the surface of the steel strip coil, and the gases ejected by adjacent inner supporting arms 41 form a left-right flow and generate a counterflush on the surface of the coil, finally constructing a circumferential swirling airflow field to achieve uniform heat exchange and oxide layer control.

[0042] The double-adjusting force dividing ring includes an adjusting force dividing ring one 23 and an adjusting force dividing ring two 24. Both the adjusting force dividing ring one 23 and the adjusting force dividing ring two 24 are rotatably connected to the outer wall of the inner adjusting furnace body 22, and the two are parallel to each other.

[0043] The driving mechanism 3 includes an outer protection cover 31 fixed outside the bell-type annealing furnace body 11. A plurality of groups of power components are fixedly arranged inside the outer protection cover 31. Each group of power components corresponds to a group of diameter-dependent auxiliary spraying mechanisms 2. Each group of power components respectively includes a control push rod one 32 and a control push rod two 33, and both the control push rod one 32 and a control push rod two 33 are controlled by the intelligent module.

[0044] A counterclockwise pulling rope 27 is fixedly connected to the telescopic arm of the control push rod one 32, and a clockwise pulling rope 26 is fixedly connected to the telescopic arm of the control push rod two 33. The other end of the counterclockwise pulling rope 27 is fixedly connected to the outer circumference of the adjusting force dividing ring two 24, and the other end of the clockwise pulling rope 26 is fixedly connected to the outer circumference of the adjusting force dividing ring one 23.

[0045] The pushing member includes a limit seat 42. The limit seat 42 is slidably connected to the inner supporting arm 41, and the limit seat 42 is located inside the inner supporting arm 41. At the same time, the limit seat 42 is fixedly connected to the inner wall of the inner adjusting furnace body 22.

[0046] Such as Figure 5 、 Figure 6 、 Figure 7 And Figure 8 As shown, a main support frame 45 is fixedly arranged at the central position of the limit seat 42. A main screw rod 48 rotatably connected thereto is passed through the central position of the main support frame 45. A belt pulley 46 is fixedly arranged at one end of the main screw rod 48 close to the main support frame 45.

[0047] The belt pulley 46 is provided with two belt grooves, and a winding belt 47 is fixedly arranged in each belt groove. The winding directions of the two winding belts 47 in different belt grooves are opposite, and the ends of the two winding belts 47 far from the belt pulley 46 are respectively fixedly connected to the corresponding double-adjusting force dividing rings to control the forward and reverse rotation of the main screw rod 48.

[0048] A sliding push block one (49) is movably arranged on the main screw rod (48). A push arm main column (401) is fixedly arranged on the upper part of the sliding push block one (49). One end of the push arm main column (401) far away from the sliding push block one (49) is fixedly connected with the inner supporting arm (41). On both sides of the main screw rod (48), sliding push blocks two (402) are arranged. A limiting column (403) and a guiding column (406) are crosswise arranged inside the sliding push block two (402). A push arm auxiliary column (404) is fixedly arranged on the sliding push block two (402). One end of the push arm auxiliary column (404) far away from the sliding push block two (402) is provided with a universal ball (405), and the universal ball (405) is slidably connected with the inner supporting arm (41).

[0049] The sliding push block two (402) is subjected to the thrust of the limiting column (403), and at the same time, the sliding push block two (402) slides along the limiting column (403) and the guiding column (406). The push arm auxiliary column (404) displaces along with the sliding push block two (402), ensuring the stability when the inner supporting arm (41) adjusts its position.

[0050] An annular air supply pipe (25) is also fixedly arranged on the outer wall of the inner adjusting furnace body (22). The air inlet end of the annular air supply pipe (25) is connected with an air supply main pipe (21). The air outlet end of the annular air supply pipe (25) is connected with a telescopic air pipe (44), and the telescopic air pipe (44) is array-connected with the jet heads (43) and is mutually communicated. A sensor (51) is also arranged on the side wall of the inner supporting arm (41) and is connected with the intelligent module.

[0051] When using the bell-type annealing furnace for grain-oriented silicon steel, first, it is necessary to cooperate with the lifting equipment to vertically lift the bell-type annealing furnace body (11) upward. After that, place the grain-oriented silicon steel strip coil on the base of the annealing furnace. After all the grain-oriented silicon steel strip coils are placed, then use the lifting equipment to cover the bell-type annealing furnace body (11) on the grain-oriented silicon steel strip coil and complete the assembly with the base of the annealing furnace;

[0052] According to the diameter size of the grain-oriented silicon steel strip coil, through the intelligent module, control the telescopic arm of the push rod two (33) to retract, and control the telescopic arm of the push rod one (32) to extend. The two simultaneously control the clockwise pulling rope (26) and the counterclockwise pulling rope (27). While controlling the telescopic arm of the push rod one (32) to extend, pull the counterclockwise pulling rope (27). Pull the adjusting split force ring two (24) to rotate counterclockwise through the counterclockwise pulling rope (27). While controlling the telescopic arm of the push rod two (33) to retract, release the clockwise pulling rope (26);

[0053] The counterclockwise rotation of the adjusting split force ring two (24) will pull a coiling belt (47), release the coiling belt (47), thereby driving the belt pulley (46) to rotate, and wind up the other coiling belt (47), driving the adjusting split force ring one (23) to rotate clockwise. In this way, by controlling the push rod one (32) and the push rod two (33), the main screw rod (48) can be controlled to rotate in different directions;

[0054] When the main screw 48 rotates, it can drive the first sliding block 49 to move towards the furnace core, thereby pushing the inner supporting arm 41 towards the furnace core through the main column 401 of the push arm, gradually approaching the outer wall of the grain-oriented silicon steel strip coil until it moves to the position preset by the intelligent module. When the main screw 48 rotates in the reverse direction, it can pull the inner supporting arm 41 back to its original position;

[0055] At this time, gas is supplied to the surrounding gas supply pipe 25 through the main gas supply pipe 21, and the gas is then shunted into different telescopic gas pipes 44, and finally directly sprayed onto the outer wall of the grain-oriented silicon steel strip coil through the jet head 43 array. The airflows of adjacent inner supporting arms 41 form a counter-rotating vortex on the surface of the strip coil, realizing uniform heat exchange and oxide layer control. Compared with the traditional fixed jet system, the heat exchange efficiency is increased by 35%.

[0056] The jets of adjacent inner supporting arms 41 form a "three-zone superposition effect":

[0057] Direct injection zone: The gas film thickness δ = 3 - 5 mm, and the heat transfer coefficient α = 120 - 180 W / (m²·K);

[0058] Counter-rotating zone: The turbulence intensity Tu = 15% - 25%, enhancing the boundary layer peeling;

[0059] Circulation zone: The residence time t = 0.8 - 1.2 s, promoting the uniform formation of the oxide layer, and the thickness control is 10 - 20 μm;

[0060] The sensor 51 can monitor the data of the air cyclone in the gap between two adjacent inner supporting arms 41 in real time, so as to adjust the inner supporting arm 41 in real time, enabling the inner supporting arm 41 group to approach the surface of the strip coil synchronously to form a dynamic jet gap;

[0061] Realize dynamic jet distance control, eliminating the defects of "edge overburning and center underheating" caused by the traditional fixed jet distance.

[0062] The second aspect of the present invention provides a method for a bell-type annealing furnace for grain-oriented silicon steel, including the following steps:

[0063] S1. Vertically lift the bell-type annealing furnace body 11 through a hoisting device. After placing multiple grain-oriented silicon steel strip coils on the annealing furnace base, re-cover the furnace body and the base to form a sealed chamber;

[0064] S2. Receive the diameter parameter of the steel strip coil through the intelligent module, control the first push rod 32 to extend and the second push rod 33 to retract, so that the counterclockwise pull rope 27 drives the second adjusting force dividing ring 24 to rotate counterclockwise, and at the same time the clockwise pull rope 26 is released to drive the first adjusting force dividing ring 23 to rotate clockwise;

[0065] S3. Drive the main screw rod 48 to rotate through the double-adjusting component force ring linkage pulley 46, and push the first sliding block 49 to drive the inner abutting arm 41 group to radially approach the surface of the steel strip coil synchronously through the push arm main column 401. Start the main air supply pipe 21 to supply the mixed gas to the jet head 43 array through the surrounding air supply pipe 25 and the telescopic air pipe 44;

[0066] S4. Real-time monitor the cyclone data between adjacent inner abutting arms 41 through the sensor 51, and feedback it to the intelligent module to dynamically adjust the strokes of the first control push rod 32 and the second control push rod 33, so that the jet airflow from the jet head 43 forms a left-right flowing counterflush on the surface of the steel strip coil, and construct a circumferential swirling airflow field;

[0067] S5. After the annealing process is completed, reversely drive the main screw rod 48 to drive the inner abutting arm 41 group to reset, close the air supply system and lift the bell-type annealing furnace body 11.

[0068] The embodiments of the present invention have been described above, but the present invention is not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A protective bell-type annealing furnace for grain-oriented silicon steel, characterized in that, Including: A bell-type annealing furnace body (11) with multiple groups of diameter-dependent spraying assistance mechanisms (2) arranged inside. The diameter-dependent spraying assistance mechanism (2) includes an inner adjustment furnace body (22), a pushing member, and a gas spraying member. The gas spraying member is composed of multiple inner supporting arms (41) evenly distributed along the inner circumference of the inner adjustment furnace body (22). An array of gas spraying nozzles (43) is provided on the side of each inner supporting arm (41) close to the furnace center. A double-adjustment force distribution ring is provided on the outer wall of the inner adjustment furnace body (22). Its inner circumference is connected to the pushing member, and its outer circumference is connected to a driving mechanism (3). The intelligent module controls the operation of the driving mechanism (3) based on the diameter of the steel strip coil, driving the corresponding adjustment force distribution ring to rotate and displace. The pushing member is used to push the inner supporting arm (41) group to radially displace to a set spacing. The mixed gas sprayed by the gas spraying nozzles (43) directly hits the surface of the steel strip coil. The gases sprayed by adjacent inner supporting arms (41) form a left-right flow and generate a counter-jet on the surface of the coil, finally constructing a circumferential swirling airflow field to achieve uniform heat exchange and oxide layer control.

2. The protective oriented silicon steel bell-type annealing furnace according to claim 1, characterized in that, The double-adjustment force distribution ring includes an adjustment force distribution ring one (23) and an adjustment force distribution ring two (24). Both the adjustment force distribution ring one (23) and the adjustment force distribution ring two (24) are rotatably connected to the outer wall of the inner adjustment furnace body (22), and they are parallel to each other.

3. The protective bell-type annealing furnace for grain-oriented silicon steel according to claim 2, characterized in that, The driving mechanism (3) includes an outer protection cover (31) fixed outside the bell-type annealing furnace body (11). Multiple groups of power components are fixedly arranged inside the outer protection cover (31). Each group of power components corresponds to a group of diameter-dependent spraying assistance mechanisms (2). Each group of power components respectively includes a control push rod one (32) and a control push rod two (33). Both the control push rod one (32) and the control push rod two (33) are controlled by the intelligent module.

4. A protective bell-type annealing furnace for grain-oriented silicon steel according to claim 3, characterized in that, A counterclockwise pulling rope (27) is fixedly connected to the telescopic arm of the control push rod one (32). A clockwise pulling rope (26) is fixedly connected to the telescopic arm of the control push rod two (33). The other end of the counterclockwise pulling rope (27) is fixedly connected to the outer circumference of the adjustment force distribution ring two (24). The other end of the clockwise pulling rope (26) is fixedly connected to the outer circumference of the adjustment force distribution ring one (23).

5. A protective bell-type annealing furnace for grain-oriented silicon steel according to claim 1, characterized in that, The pushing member includes a limit seat (42). The limit seat (42) is slidably connected to the inner supporting arm (41), located inside the inner supporting arm (41), and is fixedly connected to the inner wall of the inner adjustment furnace body (22).

6. A protective bell-type annealing furnace for grain-oriented silicon steel according to claim 5, characterized in that, A main support frame (45) is fixedly arranged at the central position of the limit seat (42). A main screw rod (48) rotatably connected to it is passed through the central position of the main support frame (45). A pulley (46) is fixedly arranged at one end of the main screw rod (48) close to the main support frame (45).

7. A protective bell-type annealing furnace for grain-oriented silicon steel according to claim 6, characterized in that, The pulley (46) is provided with two pulley grooves, and a winding belt (47) is fixedly arranged in each pulley groove. The winding directions of the two winding belts (47) in different pulley grooves are opposite, and the ends of the two winding belts (47) away from the pulley (46) are respectively fixedly connected to the corresponding double-adjustment force distribution rings to control the forward and reverse rotation of the main screw rod (48).

8. A protective bell-type annealing furnace for grain-oriented silicon steel according to claim 7, characterized in that, A sliding block one (49) is movably arranged on the main screw rod (48). A main push arm column (401) is fixedly arranged on the sliding block one (49). One end of the main push arm column (401) far away from the sliding block one (49) is fixedly connected with an inner leaning arm (41). Sliding blocks two (402) are arranged on both sides of the main screw rod (48). A limiting column (403) and a guiding column (406) are crosswise arranged inside the sliding blocks two (402). A secondary push arm column (404) is fixedly arranged on the sliding blocks two (402). One end of the secondary push arm column (404) far away from the sliding blocks two (402) is provided with a universal ball (405). The universal ball (405) is slidably connected with the inner leaning arm (41).

9. A protective bell-type annealing furnace for grain-oriented silicon steel according to claim 1, characterized in that, An annular air supply pipe (25) is also fixedly arranged on the outer wall of the inner adjustable furnace body (22). The air inlet end of the annular air supply pipe (25) is connected with an air supply main pipe (21). The air outlet end of the annular air supply pipe (25) is connected with a telescopic air pipe (44). The telescopic air pipe (44) is array-connected with jet heads (43) and is communicated with each other. A sensor (51) is also arranged on the side wall of the inner leaning arm (41) and is connected with an intelligent module.

10. A method of using a batch annealing furnace for grain-oriented silicon steel according to any one of claims 1-9, characterized in that, Including the following steps: S1. Vertically lift the bell-type annealing furnace body (11) by a hoisting device. After placing a plurality of oriented silicon steel strip coils on the annealing furnace base, cover the furnace body and the base again to form a sealed chamber. S2. Receive the diameter parameter of the steel strip coil through the intelligent module, control the control push rod one (32) to extend and the control push rod two (33) to retract, so that the counterclockwise pulling rope (27) pulls the adjusting split force ring two (24) to rotate counterclockwise. At the same time, the clockwise pulling rope (26) is released to drive the adjusting split force ring one (23) to rotate clockwise. S3. Drive the main screw rod (48) to rotate through the double-adjusting split force ring linkage pulley (46), push the sliding block one (49) to drive the inner leaning arm (41) group to radially approach the surface of the steel strip coil synchronously through the main push arm column (401). Start the air supply main pipe (21) to supply mixed gas to the jet head (43) array through the annular air supply pipe (25) and the telescopic air pipe (44). S4. Real-time monitor the cyclone data between adjacent inner leaning arms (41) through the sensor (51), feedback to the intelligent module to dynamically adjust the strokes of the control push rod one (32) and the control push rod two (33), so that the jet airflow forms a left-right flowing counterflush on the surface of the steel strip coil to construct a circumferential swirling airflow field. S5. After completing the annealing process, reversely drive the main screw rod (48) to drive the inner leaning arm (41) group to reset, close the air supply system and lift the bell-type annealing furnace body (11).

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