Fire protection device for high activity space peep window and hot cell

Abstract

The application discloses a fireproof protection device for a high-radioactivity space peep window, which comprises a door plate mechanism, a counterweight mechanism and a traction mechanism. The door plate mechanism comprises a plate body which can move along the wall where the peep window is located. The counterweight mechanism is connected with the plate body and can move from a high position to a low position under the action of gravity. In the process, the plate body moves from the lower part of the peep window to the position covering the peep window. The traction end of the traction mechanism is connected with the counterweight mechanism, so that the counterweight mechanism is kept at the high position and is released under the condition of receiving a fire signal and power failure. The fireproof protection device has the advantages of simple structure, reasonable arrangement, convenient use and good fireproof protection capacity, and is suitable for the fireproof protection of the high-radioactivity space peep window. The application further provides a hot chamber.

Description

Technical Field

[0001] This invention specifically relates to a fire protection device and a hot chamber for a high-radioactivity space viewing window. Background Technology

[0002] In nuclear industry projects, some sub-projects require handling highly radioactive sources. To achieve radiation shielding, spatial boundaries are reinforced using thickened or heavy concrete. These spaces are generally called hot chambers or other high-radiation spaces. Due to the high radioactivity within the hot chamber, personnel cannot directly enter to operate it. Instead, they operate robotic arms through viewing windows from an external control room. These viewing windows are typically made of lead glass, and the thickness and number of panes vary depending on the specific radiation source.

[0003] In the fire protection design of nuclear industry projects, due to the unknown fire resistance performance of lead glass and peepholes, the walls containing peepholes are typically included within fire compartments to avoid overlap between hot chamber boundaries and fire protection boundaries. However, with the continuous development of reprocessing requirements and scale, the layout and space of hot chambers within the plant are also constantly increasing, inevitably leading to overlap between hot chamber boundaries and fire protection boundaries.

[0004] When a peephole is located at a fire-resistant boundary, it must also meet the corresponding fire resistance limit to prevent it from becoming a weak point on the boundary. However, current research on peepholes and their components mainly focuses on their shielding and optical properties, and there has been no research on their fire resistance performance, thus lacking comprehensive fire protection measures. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art by providing a fire protection device for a high-radioactivity space viewing window. The device has a simple structure, reasonable design, and is easy to use. It has good fire protection capabilities and is suitable for fire protection of high-radioactivity space viewing windows. The present invention also provides a hot chamber.

[0006] This invention provides a fire protection device for a high-radiation space viewing window, including a door panel mechanism, a counterweight mechanism, and a traction mechanism. The door panel mechanism includes a plate that can move along the wall where the viewing window is located, used to protect the viewing window in the event of a fire. The counterweight mechanism is connected to the plate and can move the plate upward from the bottom of the viewing window to cover it during the movement of the plate from a high position to a low position under the action of gravity. The traction end of the traction mechanism is connected to the counterweight mechanism to keep it in a high position and is used to release the counterweight mechanism upon receiving a fire signal or in the event of a power outage.

[0007] Furthermore, the door panel mechanism also includes a sliding frame, which is located on the wall where the viewing window is located and is vertically arranged along the side of the viewing window. The two sides of the panel are arranged in the sliding frame and slide along the sliding frame under the traction of the counterweight mechanism.

[0008] Furthermore, the side of the plate is provided with a buckle, the sliding frame is provided with a guide groove, the top end of the guide groove is provided with a bend section that turns toward the viewing window, the rest of the guide groove is opened in the vertical direction, the buckle is slidably adapted to the guide groove so that the plate slides along the guide groove under the traction of the counterweight mechanism and presses against the viewing window when it reaches the bend section.

[0009] Furthermore, the door panel mechanism also includes a fireproof sealing strip, which is installed on the wall where the peephole is located, at the corresponding position at the end of the bend section near the peephole. The bend section gradually decreases from the end away from the peephole to the end near the peephole, so that the fireproof sealing strip is pressed tightly when the panel is pressed against the peephole.

[0010] Furthermore, the buckle includes an upper buckle and a lower buckle, which are located at the upper and lower ends of the side of the plate, respectively. The guide groove includes a first guide groove and a second guide groove, which are respectively set to correspond to the movement trajectory of the upper buckle and the lower buckle.

[0011] Furthermore, the counterweight mechanism includes a gravity hammer, a first connecting wire, and a chain drive assembly. The chain drive assembly is disposed within the slide frame, corresponding to the position of the guide groove. Its drive chain is formed into a closed loop by a working section and a return section. The stroke of the working section is consistent with that of the guide groove. The buckle end passes through the guide groove and connects to the drive chain. One end of the first connecting wire is connected to the gravity hammer, and the other end is connected to the chain drive assembly, so that as the gravity hammer moves from a high position to a low position, it drives the chain drive assembly to move, thereby driving the plate to slide along the guide groove through the drive chain.

[0012] Furthermore, the counterweight mechanism also includes a fixed pulley and a rotating shaft. The rotating shaft and the sprocket of the chain drive assembly rotate synchronously. The fixed pulley is located on the top of the slide frame, and the first connecting wire passes around the fixed pulley and is wound around a first winding wheel located on the rotating shaft.

[0013] Furthermore, the traction mechanism includes a driving member, a second winding wheel, and a second connecting wire. The second connecting wire is wound on the second winding wheel and its end is connected to the counterweight mechanism. The driving member is equipped with a signal receiving device. The driving end of the driving member is connected to the second winding wheel. Under normal conditions, a set driving force is output to keep the second winding wheel stationary. When a fire signal is received or the power is cut off, the force is released so that the second winding wheel releases the counterweight mechanism.

[0014] The present invention also provides a hot chamber, including a viewing window disposed on the wall of the hot chamber, and further including the fire protection device for the aforementioned high radioactivity space viewing window, wherein the fire protection device is disposed corresponding to the viewing window and located on the outer wall surface of the hot chamber wall.

[0015] Furthermore, a groove is provided in the ground below the wall where the viewing window is located, and a buffer pad is installed in the groove to prevent the panel from impacting the ground.

[0016] The fire protection device for the high-radioactivity space viewing window of the present invention has a counterweight mechanism that provides counterweight to the plate. During the process of moving from a high position to a low position under the action of gravity, the plate is pulled from the lower part of the viewing window upward to cover the viewing window. Under normal circumstances, the traction mechanism keeps the counterweight mechanism in a high position, and only releases the counterweight mechanism when a fire signal is received or the power is cut off.

[0017] It is evident that this invention provides an automated fire protection device for peepholes. This device primarily protects the peephole by covering it without altering or damaging its structure. Therefore, when the boundary of a high-radioactivity space such as a hot chamber overlaps with the fire protection boundary, this device can provide fire protection for the weak point (the peephole). Without changing the structure of the peephole itself, it ensures the fire resistance integrity of the hot chamber boundary, meets the fire resistance limit requirement of not less than 2.0 hours, blocks the transmission of fire load between ordinary rooms and hot chambers, ensures the fire safety of hot chambers, improves the safety of the factory building, and enriches the application of fire protection design in high-radioactivity areas.

[0018] The design, which applies traction under normal conditions and achieves coverage by gravity under abnormal conditions, makes the fire protection process more rational. The fire protection action is initiated entirely by natural force, without the need for a drive, reducing structural complexity and improving activation reliability. Whether the traction mechanism is effective or has failed, the counterweight mechanism can be released to drive the plate to achieve coverage protection. It is suitable for fire protection of viewing windows in high-radioactivity spaces, ensuring the stability of the hot chamber under fire conditions, preventing the leakage of radioactive materials, and further ensuring the safety of the plant and the entire plant area. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the function of the fire protection device for the high-radioactivity space viewing window in Embodiment 1 of the present invention.

[0020] Figure 2 This is a schematic diagram of the fire protection device for the high-radioactivity space viewing window in Embodiment 1 of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the fire protection device for the high-radioactivity space viewing window in Embodiment 1 of the present invention;

[0022] Figure 4 This is another internal structural schematic diagram of the fire protection device for the high-radioactivity space viewing window in Embodiment 1 of the present invention.

[0023] In the diagram: 1. Door panel mechanism; 11. Sliding frame; 111. First guide groove; 112. Second guide groove; 12. Panel; 121. Upper buckle; 122. Lower buckle; 123. Handle;

[0024] 13. Fireproof sealing strip; 2. Counterweight mechanism; 21. Gravity hammer; 22. First connecting thread;

[0025] 23. Chain drive assembly; 231. Drive chain; 232. Sprocket; 2321. Drive sprocket;

[0026] 2322, Follower sprocket; 2323, Tensioner sprocket; 24, Fixed pulley; 25, Rotating shaft; 3, Traction mechanism; 31, Second winding wheel; 32, Second connecting wire; 33, Signal receiving device; 4, Viewing window; 5, Groove; 51, Buffer pad. Detailed Implementation

[0027] The technical solutions of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort are within the scope of the invention.

[0028] In the description of this invention, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of the description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] In the description of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, the fire protection device for the high-radioactivity space viewing window in this embodiment includes a door panel mechanism 1, a counterweight mechanism 2, and a traction mechanism 3. The door panel mechanism 1 includes a plate 12, which can move along the wall where the viewing window 4 is located, and is used to protect the viewing window 4 in the event of a fire. The counterweight mechanism 2 is connected to the plate 12 and can move from a high position to a low position under the action of gravity, and can pull the plate 12 from the lower part of the viewing window 4 upward to cover the viewing window 4. The traction end of the traction mechanism 3 is connected to the counterweight mechanism 2 to keep it in a high position, and is used to release the counterweight mechanism 2 when a fire signal is received or when the power is cut off.

[0033] This embodiment provides an automated fire protection device for viewing windows. This device mainly protects the viewing window 4 by covering it without altering or damaging the structure of the viewing window 4 itself. Therefore, when the boundary of a high-radioactivity space such as a hot chamber overlaps with the fire protection boundary, this device can provide fire protection for the weak point (viewing window 4). Without changing the structure of the viewing window 4 itself, it ensures the fire resistance integrity of the hot chamber boundary, meets the fire resistance limit requirement of not less than 2.0 hours, blocks the transmission of fire load between ordinary rooms and hot chambers, ensures the fire safety of hot chambers, improves the safety of the factory building, and enriches the application of fire protection design in high-radioactivity areas.

[0034] The counterweight mechanism 2 is activated in two ways. Situation 1: When the traction mechanism 3 (signal receiving device 33) receives a fire signal, it releases the built-in second winding wheel 31 via the drive component, causing the counterweight mechanism 2 (gravity hammer 21) to fall. Situation 2: When a fire or other emergency causes a power outage, the traction mechanism 3 fails, and the counterweight mechanism 2 (gravity hammer 21) falls naturally.

[0035] The design, which applies traction force under normal conditions and achieves coverage by gravity under abnormal conditions, makes the fire protection process more rational. The fire protection action is initiated entirely by natural force, without the need for a drive, reducing structural complexity and improving start-up reliability. Regardless of whether the traction mechanism 3 is effective or has failed, the counterweight mechanism 2 can be released to drive the plate 12 to achieve coverage protection. It is suitable for fire protection of viewing windows in high-radioactivity spaces, ensuring the stability of the hot chamber under fire conditions, preventing the leakage of radioactive materials, and further ensuring the safety of the plant and the entire plant area.

[0036] In this embodiment, the plate 12 covering the viewing window 4 is a composite fireproof cover plate, which achieves fireproof performance by filling the metal plate with perlite, or magnesium chloride and magnesium oxide.

[0037] In this embodiment, the door panel mechanism 1 also includes a sliding frame 11, which is located on the wall where the viewing window 4 is located and is vertically arranged along the side of the viewing window 4. A sliding frame 11 is provided on each side of the viewing window 4, and the two sides of the panel 12 are arranged in the sliding frame 11. Under the traction of the counterweight mechanism 2, the panel slides along the sliding frame 11 to ensure that it moves along the set path.

[0038] In this embodiment, as Figure 3 and Figure 4 As shown, the side of the plate 12 is provided with a buckle, and the sliding frame 11 is provided with a guide groove. The top end of the guide groove is provided with a bend section that turns towards the viewing window 4. The rest of the guide groove is opened in the vertical direction. The buckle is slidably adapted to the guide groove so that the plate 12 slides along the guide groove under the traction of the counterweight mechanism 2 and presses against the viewing window 4 when it reaches the bend section, thereby ensuring that the fireproof performance of the plate 12 can play an effective role.

[0039] In this embodiment, the door panel mechanism 1 also includes a fireproof sealing strip 13. The fireproof sealing strip 13 is installed on the wall where the viewing window 4 is located, at the corresponding position at the end of the bend section near the viewing window 4. The bend section gradually decreases from the end away from the viewing window 4 to the end near the viewing window 4, which is equivalent to setting a pressing device at an appropriate position so that when the panel 12 presses against the viewing window 4, the fireproof sealing strip 13 is pressed under the action of gravity, ensuring airtightness under fire conditions.

[0040] In this embodiment, the latches include an upper latch 121 and a lower latch 122, which are located at the upper and lower ends of the side of the plate 12, respectively. The guide grooves include a first guide groove 111 and a second guide groove 112, which are respectively set to correspond to the movement trajectories of the upper latch 121 and the lower latch 122. That is, the upper latch 121 slides in the first guide groove 111, and the top of the first guide groove 111 is hook-shaped (turning section) facing the viewing window 4. The lower latch 122 slides in the second guide groove 112, and the top of the second guide groove 112 is hook-shaped (turning section) facing the viewing window 4. The second guide groove 112 is located directly below the first guide groove 111.

[0041] In this embodiment, the counterweight mechanism 2 includes a gravity hammer 21, a first connecting wire 22, and a chain drive assembly 23. The chain drive assembly 23 is disposed inside the slide frame 11, corresponding to the position of the guide groove. Its drive chain 231 is formed into a closed loop by a working section and a return section. The stroke of the working section is consistent with the guide groove. The buckle end passes through the guide groove and connects to the drive chain 231. One end of the first connecting wire 22 is connected to the gravity hammer 21, and the other end is connected to the chain drive assembly 23, so that when the gravity hammer 21 moves from a high position to a low position, it drives the chain drive assembly 23 to move, thereby driving the plate 12 to slide along the guide groove through the drive chain 231.

[0042] Specifically, such as Figure 4As shown, in the chain drive assembly 23, the drive sprocket 2321 in the sprocket 232 is located at the top of the first guide groove 111, the follower sprocket 2322 is located at the end of the turning section, and the tension sprocket 2323 is located at the bottom of the first guide groove 111. When the drive chain 231 is running, the working section passes through the tension sprocket 2323, the drive sprocket 2321, and the follower sprocket 2322 in sequence, and turns at the follower sprocket 2322 to enter the return section until it reaches the tension sprocket 2323.

[0043] Since the gravity hammer 21 can only achieve vertical traction under the action of gravity, in order to ensure that the plate 12 can slide along the guide groove to the end of the bend, a chain drive assembly 23 is also provided in this embodiment. The chain drive assembly 23 can be specifically set at a position corresponding to the guide groove, such as... Figure 3 and Figure 4 As shown, for example, a guide groove is set on a shelf, and the end of the buckle passes through the shelf where the guide groove is located and is connected to the transmission chain 231. During the descent of the gravity hammer 21, the chain drive assembly 23 (sprocket 232) is pulled by the first connecting wire 22, causing the chain drive assembly 23 to run, thereby causing the transmission chain 231 to drive the buckle to move along the guide groove. In this embodiment, the position of the chain drive assembly 23 corresponds to the first guide groove 111, that is, the chain drive assembly 23 mainly pulls the upper buckle 121 to slide along the first guide groove 111, while the lower buckle 122 moves along the second guide groove 112.

[0044] In this embodiment, the counterweight mechanism 2 further includes a fixed pulley 24 and a rotating shaft 25. The rotating shaft 25 and the sprocket 232 of the chain drive assembly 23 rotate synchronously. The fixed pulley 24 is located on the top of the slide frame 11. The first connecting wire 22 passes around the fixed pulley 24 and is wound around a first winding wheel on the rotating shaft 25. The fixed pulley 24 enables the first connecting wire 22 to rotate. During the descent of the gravity hammer 21, the first connecting wire 22 continuously winds out from the first winding wheel, thereby driving the rotating shaft 25 to rotate.

[0045] In this embodiment, the traction mechanism 3 includes a driving member, a second winding wheel 31, and a second connecting wire 32. The second connecting wire 32 is wound around the second winding wheel 31, and its end is connected to the counterweight mechanism 2. The driving member is equipped with a signal receiving device 33, and the driving end of the driving member is connected to the second winding wheel 31. Under normal conditions, it outputs a set driving force to keep the second winding wheel 31 stationary. When a fire signal is received or the power is off, the force is released so that the second winding wheel 31 releases the counterweight mechanism 2. Both the first connecting wire 22 and the second connecting wire 32 are made of steel wire.

[0046] This device uses sliding frames 11 installed on both sides of the viewing window 4 as tracks, and a gravity hammer 21 to pull the plate 12. Figure 1 As shown, the specific process is as follows:

[0047] Under normal conditions, the drive unit outputs a certain driving force to keep the second winding wheel 31 stationary, thereby ensuring that the gravity hammer 21 is in a high position. When a fire signal is received or the power is cut off, the drive unit stops outputting driving force, and the gravity hammer 21 loses the traction applied by the drive unit through the second connecting wire 32, so it begins to fall. Once the gravity hammer 21 begins to fall, it will tighten the first connecting wire 22 and move downwards, causing the rotating shaft 25 to rotate through the upper fixed pulley 24, and driving the drive sprocket 2321 in the slide frame 11 to rotate. The plate body 12 has protruding buckles at the four corners. The two upper buckles 121 are inside the first guide groove 111. When the drive sprocket 2321 rotates, the transmission chain 231 drives the upper buckles 121 to move upwards, while the two lower buckles 122 are installed inside the second guide groove 112 and are also driven upwards along with the uppermost drive sprocket 2321. Fireproof sealing strips 13 are provided on both the upper and lower sides of the viewing window 4. When the upper buckle 121 passes the drive sprocket 2321 and moves towards the follower sprocket 2322, its running trajectory is biased towards one side of the viewing window 4. It is pressed against the fireproof sealing strip 13 by the gravity of the plate 12, thus achieving a fireproof effect. The two lower buckles 122 are also brought into the bend section on the side of the viewing window 4, and reach the designated position through the bend section, where they are pressed against the lower fireproof sealing strip 13. By pulling the four corners of the plate 12, it is covered to the designated position, ultimately achieving the protection of the viewing window 4. The plate 12 is provided with a handle 123 for holding. When the plate 12 needs to be reset, it can be manually moved downwards by the handle 123 and the gravity hammer 21 can be pulled by the traction mechanism 3 to move the plate 12 back to the original position on the ground.

[0048] This design achieves fire-resistant operation through a sliding frame 11 and a chain drive assembly 23. The transmission is stable and reliable, requiring no manual intervention. Compared to manual opening and closing, it prevents safety accidents caused by the randomness and unreliability of human intervention. Compared to electrically driven opening and closing methods, this design has a simple structure, stable operation, low manufacturing cost, and is easy to inspect, maintain, and repair daily. It is suitable for locations with high fire resistance requirements, providing good fire resistance and airtightness. It needs to be used in conjunction with the through-hole of the viewing window 4, and the sliding process should avoid affecting other items.

[0049] Example 2

[0050] The hot chamber of this embodiment includes a viewing window 4, which is installed on the wall of the hot chamber. It also includes a fire protection device for the high radioactivity space viewing window in embodiment 1. The fire protection device is installed corresponding to the viewing window 4 and is located on the outer wall surface of the hot chamber.

[0051] In this embodiment, a groove 5 is provided on the ground below the wall where the viewing window 4 is located, and a buffer pad 51 is provided in the groove 5 to prevent the plate 12 from impacting the ground.

[0052] This solution provides fire protection for the installed viewing window 4 using a separate technical approach. The main structure of the viewing window 4 remains unchanged, but a panel 12 is added to its outer side for protection. Considering the large number of safety-grade items and cables within the hot chamber operating area, a sliding device is adopted. It is primarily applied to the outer side of the installed viewing window 4, i.e., the side of the hot chamber operating area.

[0053] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A fire protection device for a high-radiation space viewing window, characterized in that: It includes a door panel mechanism (1), a counterweight mechanism (2), and a traction mechanism (3). The door panel mechanism (1) includes a panel (12) which can move along the wall where the viewing window (4) is located, and is used to protect the viewing window (4) in the event of a fire. The counterweight mechanism (2) is connected to the plate (12) and can pull the plate (12) from the bottom of the viewing window (4) upward to cover the viewing window (4) during the process of moving from a high position to a low position under the action of gravity. The traction end of the traction mechanism (3) is connected to the counterweight mechanism (2) to keep it in a high position and to release the counterweight mechanism (2) when a fire signal is received or the power is cut off. The door panel mechanism (1) also includes a sliding frame (11), which is located on the wall where the viewing window (4) is located and is vertically arranged along the side of the viewing window (4). The two sides of the plate (12) are arranged in the sliding frame (11) and slide along the sliding frame (11) under the traction of the counterweight mechanism (2); The side of the plate (12) is provided with a buckle. The sliding frame (11) is provided with a guide groove. The top end of the guide groove is provided with a bend that turns toward the viewing window (4). The rest of the guide groove is opened in the vertical direction. The buckle is slidably adapted to the guide groove so that the plate (12) slides along the guide groove under the traction of the counterweight mechanism (2) and presses against the viewing window (4) when it reaches the turning section. The door panel mechanism (1) also includes a fireproof sealing strip (13), which is installed on the wall where the peephole (4) is located, at the corresponding position at the end of the bend section near the peephole (4). The bending section gradually decreases from the end away from the viewing window (4) to the end near the viewing window (4) so ​​that the fireproof sealing strip (13) is pressed tightly when the plate (12) presses against the viewing window (4).

2. The fire protection device for the high-radioactivity space viewing window according to claim 1, characterized in that: The buckle includes an upper buckle (121) and a lower buckle (122), which are located at the upper and lower ends of the side of the plate (12), respectively. The guide groove includes a first guide groove (111) and a second guide groove (112), which correspond to the movement trajectory settings of the upper buckle (121) and the lower buckle (122), respectively.

3. The fire protection device for the high-radioactivity space viewing window according to claim 1, characterized in that: The counterweight mechanism (2) includes a gravity hammer (21), a first connecting wire (22), and a chain drive assembly (23). The chain drive assembly (23) is located inside the slide frame (11) and corresponds to the position of the guide groove. Its drive chain (231) is formed into a closed loop by the working section and the return section, wherein the stroke of the working section is consistent with that of the guide groove. The buckle end passes through the guide groove and connects to the transmission chain (231). One end of the first connecting wire (22) is connected to the gravity hammer (21), and the other end is connected to the chain drive assembly (23) so that the chain drive assembly (23) moves as the gravity hammer (21) moves from the high position to the low position, thereby driving the plate (12) to slide along the guide groove through the transmission chain (231).

4. The fire protection device for the high-radioactivity space viewing window according to claim 3, characterized in that: The counterweight mechanism (2) also includes a fixed pulley (24) and a rotating shaft (25). The rotating shaft (25) and the sprocket (232) of the chain drive assembly (23) rotate synchronously. The fixed pulley (24) is located at the top of the slide frame (11). The first connecting wire (22) passes over the fixed pulley (24) and is then wound around the first winding wheel set on the rotating shaft (25).

5. The fire protection device for the high-radioactivity space viewing window according to claim 1, characterized in that: The traction mechanism (3) includes a drive component, a second winding wheel (31), and a second connecting wire (32). The second connecting wire (32) is wound on the second winding wheel (31) and its end is connected to the counterweight mechanism (2). The drive unit is equipped with a signal receiving device (33), and the drive end of the drive unit is connected to the second winding wheel (31). Under normal conditions, it outputs a set driving force to keep the second winding wheel (31) stationary. When a fire signal is received or the power is cut off, the force is released so that the second winding wheel (31) releases the counterweight mechanism (2).

6. A hot chamber, comprising a viewing window (4) disposed on the wall of the hot chamber, characterized in that: It also includes a fire protection device for the high-radioactivity space viewing window as described in any one of claims 1 to 5. The fire protection device is installed corresponding to the viewing window (4) and is located on the outer wall surface of the hot chamber wall.

7. The hot chamber according to claim 6, characterized in that: A groove (5) is provided on the ground below the wall where the viewing window (4) is located. A buffer pad (51) is provided in the groove (5) to prevent the plate (12) from hitting the ground.

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