Safety protection device for steel heating furnace

Abstract

The utility model discloses a steel heating furnace safety protection device which comprises a support, a furnace body is arranged on the support, an air outlet pipe is installed on the furnace body, a pressure relief mechanism is arranged at the top end of the air outlet pipe, and the pressure relief mechanism comprises a pressure relief sleeve, a supporting sleeve, a sealing plate, a push plate, a center rod, a transmission sleeve, a pressure spring, an abutting ring, a pressure discharge pipe and an adjusting mechanism. The pressure relief sleeve is installed at the top end of the gas outlet pipe, the supporting sleeve is installed in the pressure relief sleeve, when the pressure in the heating furnace is gradually increased and reaches a set pressure relief pressure threshold value, the push plate moves upwards under the action of gas pressure, the compression spring and the sealing ring are compressed to be separated from the sealing plate, and therefore the pressure relief channel is opened; excess gas in the furnace is exhausted in time through the pressure exhaust pipe, the pressure in the furnace is reduced, after the pressure relief process is completed, when the pressure is reduced to be below a set value, the pressure spring is arranged to push the push plate to reset, the sealing plate is attached to the sealing ring again, and the airtight state of the gas outlet pipe is recovered.

Description

Technical Field

[0001] This utility model relates to the field of steel heating furnace technology, and more specifically, it relates to a safety protection device for steel heating furnaces. Background Technology

[0002] In the operation of steel heating furnaces, to improve energy efficiency and reduce heat loss, the furnaces are typically designed with high sealing performance. However, in actual operation, due to the continuous rise in furnace temperature, fuel combustion or other chemical reactions may produce a large amount of gas, causing the furnace pressure to gradually accumulate. When the pressure cannot be released through a reasonable means, the excessive internal pressure may exceed the equipment's tolerance range, posing a serious threat to the safe operation of the heating furnace. In this situation, the equipment is highly likely to cause safety hazards due to excessive sealing, or even trigger an explosion, posing a great risk to the safety of operators and equipment. Therefore, to address this need, designing a device that can ensure the heating furnace's sealing performance while possessing efficient pressure release capabilities is particularly important.

[0003] Furthermore, the safety threshold of internal pressure in steel heating furnaces may vary under different working scenarios and production needs. If the triggering conditions for pressure release cannot be flexibly adjusted according to actual needs, the pressure release point of the device may be too high or too low, which will not only affect the safety of the equipment, but may also lead to energy waste or process instability. To meet these needs, it is urgent to develop a device that can effectively regulate the pressure inside the furnace and limit misoperation to ensure the reliability of equipment operation, so as to adapt to the pressure release requirements under different working conditions and ensure that the heating furnace has good safety performance while operating efficiently. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides a safety protection device for steel heating furnaces to solve the technical problem mentioned in the background art when the pressure cannot be released through a reasonable means.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: A safety protection device for a heating furnace used in steelmaking includes a support frame, a furnace body mounted on the support frame, an exhaust pipe mounted on the furnace body, and a pressure relief mechanism at the top of the exhaust pipe. The pressure relief mechanism includes a pressure relief sleeve, a support sleeve, a sealing plate, a push plate, a central rod, a transmission sleeve, a pressure spring, a stop ring, a pressure discharge pipe, and an adjustment mechanism. The pressure relief sleeve is installed at the top of the exhaust pipe, the support sleeve is installed inside the pressure relief sleeve, the sealing plate is installed at the top of the support sleeve, the central rod is located inside the pressure relief sleeve, the transmission sleeve is located inside the pressure relief sleeve, the pressure spring is installed on the bottom surface of the transmission sleeve, the stop ring is installed at the bottom end of the pressure spring, and the pressure discharge pipe is installed on the outer wall of the pressure relief sleeve. The adjustment mechanism includes an adjustment sleeve, a sliding sleeve, a threaded groove, and a rotating block. The adjustment sleeve is rotatably installed at the top of the pressure relief sleeve, the sliding sleeve is slidably installed on the outer wall of the central rod, the threaded groove is located on the inner wall of the pressure relief sleeve and is threadedly connected to the outer wall of the transmission sleeve, and the rotating block is installed at the bottom end of the central rod and is rotatably connected to the support sleeve.

[0008] The present invention is further configured such that a furnace door is rotatably mounted on the furnace body, and a sealing gasket is installed between the furnace door and the furnace body. By installing a sealing gasket between the furnace body and the furnace door, when the furnace door is closed, the sealing gasket is tightly attached to the edge of the furnace body, thereby achieving airtightness between the furnace body and the furnace door, preventing gas leakage inside the furnace, and effectively preventing external air from entering the furnace body and affecting the heating process, ensuring the sealing performance of the equipment, and improving the working efficiency and safety of the heating furnace.

[0009] The present invention is further configured such that a sealing ring is installed on the inner wall of the pressure relief sleeve, and the sealing ring is in close contact with the bottom surface of the push plate. By installing the sealing ring on the inner wall of the pressure relief sleeve, the sealing ring is in close contact with the bottom surface of the push plate, forming a highly efficient sealing effect. When the pressure relief channel is closed, it can effectively prevent gas leakage, ensure the airtightness of the pressure relief channel, and at the same time avoid abnormal pressure relief caused by gas leakage during the movement of the push plate, further improving the stability and reliability of the pressure relief mechanism.

[0010] The present invention is further configured such that the central rod is polygonal and slidably connected to the sliding sleeve. By designing the central rod as a polygon and slidably connecting it to the sliding sleeve, the sliding sleeve can remain stable when moving along the central rod, avoiding rotational deviation of the sliding sleeve and ensuring that the compression degree of the pressure spring is accurately controllable. This makes the adjustment of the pressure relief pressure more precise. At the same time, the polygonal central rod improves the torsional strength and durability of the overall structure, further enhancing the reliability of the equipment.

[0011] The present invention is further configured such that the transmission sleeve is provided with through holes, and multiple sets of through holes are provided. By providing multiple sets of through holes on the transmission sleeve, gas can flow freely through these through holes when the equipment is running, thereby reducing the air resistance encountered by the transmission sleeve during the movement and ensuring the smooth sliding of the transmission sleeve. At the same time, the design of multiple sets of through holes can further reduce the gas pressure phenomenon inside the structure and improve the smoothness and efficiency of equipment operation.

[0012] The present invention is further configured such that a sealing shaft is installed at the bottom end of the adjusting sleeve, the bottom end of the sealing shaft is fixedly connected to the central rod and the outer wall is rotatably connected to the pressure relief sleeve. By installing the sealing shaft at the bottom end of the adjusting sleeve, the sealing shaft is fixedly connected to the central rod, ensuring that the adjusting sleeve remains stable when rotating to adjust the pressure relief. At the same time, the outer wall of the sealing shaft is rotatably connected to the pressure relief sleeve, which can form a good sealing effect, effectively avoiding gas leakage caused by the rotation operation of the adjusting sleeve, and further improving the safety and reliability of the pressure relief mechanism.

[0013] The present invention is further configured such that a limiting mechanism is provided at the top of the pressure relief sleeve. The limiting mechanism includes a mounting ring, a sliding hole, a slider, a limiting block, a push spring, and a limiting groove. The mounting ring is mounted on the top surface of the pressure relief sleeve. Multiple sets of sliding holes are distributed on the mounting ring. The slider is slidably mounted in multiple sets of sliding holes. The limiting block is mounted on the top of multiple sets of sliders. The push spring is mounted on the bottom surface of multiple sets of limiting blocks and connected to the mounting ring. Multiple sets of limiting grooves are distributed on the bottom surface of the adjusting sleeve. By providing a limiting mechanism at the top of the pressure relief sleeve, the cooperation of the mounting ring, the sliding hole, and the slider allows the limiting block to slide within the sliding hole. The push spring's resetting force on the limiting block firmly locks the limiting block to the limiting groove on the bottom surface of the adjusting sleeve, thereby preventing the adjusting sleeve from rotating due to vibration or external force in the non-adjustment state, ensuring the positional stability of the adjusting sleeve, and improving the safety and accuracy of the pressure relief threshold adjustment.

[0014] This utility model is further configured such that pull rings are connected to multiple sets of limiting blocks, and handles are installed on the outer side of the pull rings. By connecting pull rings to multiple sets of limiting blocks and installing handles on the outer side of the pull rings, the operator can pull the handles to move the pull rings downwards, thereby disengaging the limiting blocks from the limiting grooves, unlocking the limiting state of the adjusting sleeve, and facilitating the adjustment of the pressure relief. After adjustment, the pull rings are released, and the limiting blocks are reset under the action of the push springs and re-engaged into the limiting grooves, ensuring that the adjusting sleeve is securely locked in the new set position. At the same time, the design of the pull rings and handles makes operation more convenient and improves the ease of use and user experience of the equipment.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a safety protection device for steel heating furnaces, which has the following beneficial effects:

[0017] 1. The beneficial effect of the pressure relief mechanism is that when the pressure inside the heating furnace gradually increases and reaches the set pressure relief threshold, the push plate moves upward under the action of gas pressure, compressing the pressure spring, and the sealing ring disengages from the sealing plate, thereby opening the pressure relief channel. Excess gas inside the furnace is discharged in time through the pressure relief pipe, reducing the pressure inside the furnace. After the pressure relief process is completed, when the pressure drops below the set value, the pressure spring pushes the push plate to reset, the sealing plate re-fits the sealing ring, and the gas outlet pipe is restored to a sealed state. This design realizes the automatic release and reset of the pressure inside the furnace, ensuring the safety and normal operation of the equipment, while avoiding safety hazards caused by excessive pressure due to excessive sealing.

[0018] 2. The beneficial effect of the adjustment mechanism is that the pressure relief threshold of the pressure relief mechanism can be flexibly adjusted by rotating the adjustment sleeve. The threaded groove of the adjustment sleeve is threadedly connected to the transmission sleeve. When the adjustment sleeve rotates, it drives the sliding sleeve to slide along the central rod, thereby driving the transmission sleeve to move up or down, changing the initial compression degree of the pressure spring, and thus adjusting the force of the pressure spring on the push plate, ultimately changing the opening pressure of the pressure relief mechanism. The operator can quickly and accurately set the pressure relief pressure according to the actual working conditions through the adjustment sleeve, ensuring that the equipment can maintain the best pressure relief effect under different operating environments, thus improving the safety and adaptability of the heating furnace.

[0019] 3. The beneficial effect of the limiting mechanism is that, through the cooperation of the limiting block and the limiting groove at the bottom of the adjusting sleeve, in the non-adjustment state, the push spring pushes the limiting block into the limiting groove, firmly restricting the rotation of the adjusting sleeve and avoiding unintentional changes in the pressure relief threshold due to vibration or misoperation. When adjustment is required, the operator can pull down the slider through the pull ring to disengage the limiting block from the limiting groove, allowing the adjusting sleeve to rotate freely for adjustment. After adjustment, the pull ring is released, and the limiting block resets under the action of the push spring, re-engaging into the limiting groove, ensuring that the adjusting sleeve is stably locked in the new set position. This design effectively prevents deviations in the pressure relief threshold caused by accidental rotation of the adjusting sleeve, further improving the reliability and safety of equipment operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a safety protection device for a steel heating furnace according to the present invention;

[0021] Figure 2 This is a schematic diagram of the pressure relief mechanism in this utility model;

[0022] Figure 3 This is a cross-sectional view of the pressure relief mechanism in this utility model.

[0023] Figure 4 This is a cross-sectional view of the transmission sleeve in this utility model;

[0024] Figure 5 This is a cross-sectional view of the limiting mechanism in this utility model.

[0025] In the diagram: 1. Bracket; 2. Furnace body; 3. Gas outlet pipe; 4. Pressure relief sleeve; 5. Support sleeve; 6. Sealing plate; 7. Push plate; 8. Center rod; 9. Transmission sleeve; 10. Compression spring; 11. Abutment ring; 12. Pressure relief pipe; 13. Adjusting sleeve; 14. Sliding sleeve; 15. Threaded groove; 16. Rotating block; 17. Furnace door; 18. Sealing gasket; 19. Sealing ring; 20. Through hole; 21. Sealing shaft; 22. Mounting ring; 23. Sliding hole; 24. Sliding block; 25. Limiting block; 26. Push spring; 27. Limiting groove; 28. Pull ring; 29. ​​Handle. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figures 1-5 A safety protection device for a steel heating furnace includes a support 1, a furnace body 2 mounted on the support 1, an exhaust pipe 3 mounted on the furnace body 2, and a pressure relief mechanism at the top of the exhaust pipe 3. The pressure relief mechanism includes a pressure relief sleeve 4, a support sleeve 5, a sealing plate 6, a push plate 7, a center rod 8, a transmission sleeve 9, a compression spring 10, a retaining ring 11, a pressure relief pipe 12, and an adjustment mechanism. The pressure relief sleeve 4 is installed at the top of the exhaust pipe 3, the support sleeve 5 is installed inside the pressure relief sleeve 4, the sealing plate 6 is installed at the top of the support sleeve 5, and the center rod 8 is located inside the pressure relief sleeve 4. The moving sleeve 9 is set inside the pressure relief sleeve 4. The compression spring 10 is installed on the bottom surface of the transmission sleeve 9. The abutment ring 11 is installed at the bottom end of the compression spring 10. The pressure relief pipe 12 is installed on the outer wall of the pressure relief sleeve 4. The adjustment mechanism includes an adjusting sleeve 13, a sliding sleeve 14, a threaded groove 15, and a rotating block 16. The adjusting sleeve 13 is rotatably installed on the top end of the pressure relief sleeve 4. The sliding sleeve 14 is slidably installed on the outer wall of the central rod 8. The threaded groove 15 is set on the inner wall of the pressure relief sleeve 4 and is threadedly connected to the outer wall of the transmission sleeve 9. The rotating block 16 is installed at the bottom end of the central rod 8 and is rotatably connected to the support sleeve 5.

[0030] A furnace door 17 is rotatably installed on the furnace body 2, and a sealing gasket 18 is installed between the furnace door 17 and the furnace body 2.

[0031] A sealing ring 19 is installed on the inner wall of the pressure relief sleeve 4, and the sealing ring 19 is in contact with the bottom surface of the push plate 7.

[0032] The center rod 8 is polygonal and slidably connected to the sliding sleeve 14.

[0033] The transmission sleeve 9 has through holes 20, and there are multiple sets of through holes 20.

[0034] A sealing shaft 21 is installed at the bottom of the adjusting sleeve 13. The bottom of the sealing shaft 21 is fixedly connected to the center rod 8 and its outer wall is rotatably connected to the pressure relief sleeve 4.

[0035] In this embodiment, before starting the equipment, the operator sets the pressure threshold of the pressure relief mechanism as needed through the adjustment mechanism. By rotating the adjustment sleeve 13, the sliding sleeve 14 can slide along the outer wall of the central rod 8. The threaded groove 15 of the adjustment sleeve 13 is threadedly connected to the outer wall of the transmission sleeve 9. When the adjustment sleeve 13 is rotated, the transmission sleeve 9 moves up or down accordingly. The up and down movement of the transmission sleeve 9 directly changes the initial compression degree of the pressure spring 10, thereby changing the force of the pressure spring 10 on the push plate 7. By adjusting the compression degree of the pressure spring 10, the pressure relief threshold of the pressure relief mechanism can be varied within a certain range. The operator can adjust the pressure relief threshold by rotating the adjustment sleeve 13 according to the specific working conditions, under the normal working state of the furnace body 2. When the pressure inside the furnace does not reach the set pressure relief threshold, the pressure relief mechanism remains sealed. The push plate 7 inside the pressure relief sleeve 4 is firmly pressed against the sealing ring 19 and the sealing plate 6 under the pressure of the pressure spring 10, ensuring the sealing of the gas outlet pipe 3. When the gas pressure inside the furnace body 2 gradually increases and reaches the set threshold, the gas acts on the bottom surface of the push plate 7 through the gas outlet pipe 3. The push plate 7 moves upward under the action of the gas pressure, compressing the pressure spring 10. At this time, the sealing ring 19 disengages from the sealing plate 6, the channel between the gas outlet pipe 3 and the pressure relief sleeve 4 is opened, and the gas is discharged through the pressure relief pipe 12. The pressure gradually decreases. When the pressure drops below the set value, the pressure spring 10 pushes the push plate 7 to reset, and the sealing plate 6 re-fits the sealing ring 19, completing the pressure relief process.

[0036] Please see Figures 4-5 As one implementation of the limiting mechanism: a limiting mechanism is provided at the top of the pressure relief sleeve 4. The limiting mechanism includes a mounting ring 22, a sliding hole 23, a slider 24, a limiting block 25, a push spring 26, and a limiting groove 27. The mounting ring 22 is installed on the top surface of the pressure relief sleeve 4. Multiple sets of sliding holes 23 are provided on the mounting ring 22. The slider 24 is slidably installed in multiple sets of sliding holes 23. The limiting block 25 is installed at the top of multiple sets of sliders 24. The push spring 26 is installed on the bottom surface of multiple sets of limiting blocks 25 and connected to the mounting ring 22. Multiple sets of limiting grooves 27 are provided on the bottom surface of the adjusting sleeve 13.

[0037] Pull rings 28 are connected to multiple sets of limit blocks 25, and handles 29 are installed on the outside of the pull rings 28.

[0038] More specifically, the mounting ring 22 of the limiting mechanism is fixed to the top surface of the pressure relief sleeve 4, and multiple sets of sliders 24 are installed in the sliding holes 23 of the mounting ring 22. The push spring 26 pushes the limiting block 25 upward so that it engages with the limiting groove 27 on the bottom surface of the adjusting sleeve 13. At this time, the adjusting sleeve 13 is stuck by the limiting block 25 and cannot rotate freely. When it is necessary to adjust the pressure relief threshold, the operator can pull the slider 24 downward through the pull ring 28 to pull the limiting block 25 out of the limiting groove 27. At this time, the adjusting sleeve 13 can rotate freely to adjust the pressure relief threshold. After the adjustment is completed, the pull ring 28 is released, and the push spring 26 pushes the limiting block 25 to reset and re-engage in the limiting groove 27 at the bottom of the adjusting sleeve 13, thus restricting the rotation of the adjusting sleeve 13.

[0039] In summary, during the use or operation of the overall equipment: Before starting the equipment, the operator sets the pressure threshold of the pressure relief mechanism as needed through the adjustment mechanism. By rotating the adjustment sleeve 13, the sliding sleeve 14 can slide along the outer wall of the central rod 8. The threaded groove 15 of the adjustment sleeve 13 is threadedly connected to the outer wall of the transmission sleeve 9. When the adjustment sleeve 13 is rotated, the transmission sleeve 9 moves up or down accordingly. The up and down movement of the transmission sleeve 9 directly changes the initial compression degree of the pressure spring 10, thereby changing the force exerted by the pressure spring 10 on the push plate 7. By adjusting the compression degree of the pressure spring 10, the pressure relief threshold of the pressure relief mechanism can be varied within a certain range. The operator can adjust the pressure relief threshold by rotating the adjustment sleeve 13 according to the specific working conditions. In operation, if the pressure inside the furnace does not reach the set pressure relief threshold, the pressure relief mechanism remains sealed. The push plate 7 inside the pressure relief sleeve 4 is firmly pressed against the sealing ring 19 and the sealing plate 6 under the pressure of the pressure spring 10, ensuring the sealing of the gas outlet pipe 3. When the gas pressure inside the furnace body 2 gradually increases and reaches the set threshold, the gas acts on the bottom surface of the push plate 7 through the gas outlet pipe 3. The push plate 7 moves upward under the action of the gas pressure, compressing the pressure spring 10. At this time, the sealing ring 19 disengages from the sealing plate 6, the channel between the gas outlet pipe 3 and the pressure relief sleeve 4 is opened, and the gas is discharged through the pressure relief pipe 12. The pressure gradually decreases. When the pressure drops below the set value, the pressure spring 10 pushes the push plate 7 to reset, and the sealing plate 6 re-fits the sealing ring 19, completing the pressure relief process.

[0040] The mounting ring 22 of the limiting mechanism is fixed to the top surface of the pressure relief sleeve 4. Multiple sets of sliders 24 are installed in the sliding holes 23 of the mounting ring 22. The push spring 26 pushes the limiting block 25 upward so that it engages with the limiting groove 27 on the bottom surface of the adjusting sleeve 13. At this time, the adjusting sleeve 13 is stuck by the limiting block 25 and cannot rotate freely. When it is necessary to adjust the pressure relief threshold, the operator can pull the slider 24 downward through the pull ring 28 to pull the limiting block 25 out of the limiting groove 27. At this time, the adjusting sleeve 13 can rotate freely to adjust the pressure relief threshold. After the adjustment is completed, the pull ring 28 is released, and the push spring 26 pushes the limiting block 25 to reset and re-engage in the limiting groove 27 at the bottom of the adjusting sleeve 13, thus restricting the rotation of the adjusting sleeve 13.

[0041] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A safety guard for heating furnaces for steel, comprising a support (1), characterized in that: The support (1) is provided with a furnace body (2), the furnace body (2) is provided with an air outlet pipe (3), the top end of the air outlet pipe (3) is provided with a pressure relief mechanism, the pressure relief mechanism comprises a pressure relief sleeve (4), a supporting sleeve (5), a sealing plate (6), a push plate (7), a center rod (8), a transmission sleeve (9), a pressure spring (10), a resisting ring (11), a pressure relief pipe (12) and an adjusting mechanism, the pressure relief sleeve (4) is installed at the top end of the air outlet pipe (3), the supporting sleeve (5) is installed in the pressure relief sleeve (4), the sealing plate (6) is installed at the top end of the supporting sleeve (5), the center rod (8) is arranged in the pressure relief sleeve (4), the transmission sleeve (9) is arranged in the pressure relief sleeve (4), the pressure spring (10) is installed on the bottom surface of the transmission sleeve (9), the resisting ring (11) is installed at the bottom end of the pressure spring (10), the pressure relief pipe (12) is installed on the outer wall of the pressure relief sleeve (4), and the adjusting mechanism comprises an adjusting sleeve (13), a sliding sleeve (14), a threaded groove (15) and a rotating block (16), the adjusting sleeve (13) is rotatably installed at the top end of the pressure relief sleeve (4), the sliding sleeve (14) is slidably installed on the outer wall of the center rod (8), the threaded groove (15) is arranged on the inner wall of the pressure relief sleeve (4) and is in threaded connection with the outer wall of the transmission sleeve (9), and the rotating block (16) is installed at the bottom end of the center rod (8) and is in rotational connection with the supporting sleeve (5).

2. The safety guard for a heating furnace for steel according to claim 1, characterized in that: The furnace door (17) is rotatably installed on the furnace body (2), and the sealing gasket (18) is installed between the furnace door (17) and the furnace body (2).

3. The safety shield for a heating furnace for steel according to claim 2, characterized in that: The sealing ring (19) is installed on the inner wall of the pressure relief sleeve (4) and is in contact with the bottom surface of the push plate (7).

4. The safety shield for a heating furnace for steel according to claim 3, characterized in that: The center rod (8) is in polygonal shape and is in sliding connection with the sliding sleeve (14).

5. The safety shield for a heating furnace for steel according to claim 4, characterized in that: The transmission sleeve (9) is provided with a plurality of through holes (20).

6. The safety shield for a heating furnace for steel according to claim 5, characterized in that: The sealing shaft (21) is installed at the bottom end of the adjusting sleeve (13), the bottom end of the sealing shaft (21) is fixedly connected with the center rod (8), and the outer wall of the sealing shaft (21) is rotatably connected with the pressure relief sleeve (4).

7. The safety shield for a heating furnace for steel according to claim 6, characterized in that: The limiting mechanism comprises a mounting ring (22), a sliding hole (23), a sliding block (24), a limiting block (25), a push spring (26) and a limiting groove (27), the mounting ring (22) is installed on the top surface of the pressure relief sleeve (4), the sliding hole (23) is arranged in multiple groups and distributed on the mounting ring (22), the sliding block (24) is slidably installed in the multiple groups of sliding holes (23), the limiting block (25) is installed at the top end of the multiple groups of sliding blocks (24), the push spring (26) is installed at the bottom surface of the multiple groups of limiting blocks (25) and is connected with the mounting ring (22), and the limiting groove (27) is arranged in multiple groups and distributed on the bottom surface of the adjusting sleeve (13).

8. The safety shield for a heating furnace for steel according to claim 7, characterized in that the plurality of groups The pull ring (28) is connected to the limiting block (25), and the handle (29) is installed on the outer side of the pull ring (28).

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